JP2020156590A - Underpants-type disposable diaper and method of manufacturing thereof - Google Patents

Abstract

To prevent the deterioration of an appearance of a non-stretchable region.SOLUTION: In an underpants-type disposable diaper, a front side exterior body 12F and a rear side exterior body 12B are separated in a front-back direction, and the front side exterior body 12F and the rear side exterior body 12B include a non-stretchable region A1 in an intermediate part in a width direction and stretchable regions A2 provided on both sides of the non-stretchable region A1 in the width direction in a range where an absorber 56 is positioned in the front-back direction. The non-stretchable region A1 includes both an inner sheet layer 12H and an outer sheet layer 12S continuing from the stretchable region A2 and an independent contraction part 19 which is left between the inner sheet layer 12H and the outer sheet layer 12S and continues from the elastic member of the stretchable region A2. A reinforcing joining part 23 where the inner sheet layer 12H and the outer sheet layer 12S are directly welded is provided in at least one part including a central part both in the width direction and the front-back direction in the non-stretchable region A1.SELECTED DRAWING: Figure 9

Description

The present invention relates to a pants-type disposable diaper and a method for manufacturing the same.

Pants-type disposable diapers are an integrated outer body that extends from the front body to the back body, or an outer body that is provided separately for the front body and the back body, and an absorbent body that is attached to the outer body so that it extends from the front body to the back body. It is equipped with an interior body including the body, and both sides of the exterior body of the front body and both sides of the exterior body of the back body are joined to form a side seal portion, whereby a waist opening and a pair of left and right leg openings are opened. What is formed is common.

In such pants-type disposable diapers, it is common to provide an elastic structure on the outer body in order to improve the fit to the body. For example, a stretchable structure provided in the waist circumference area defined as the front-rear direction range corresponding to the side seal portion and the intermediate region located between the front-rear waist circumference areas has a relatively high fit to the body. (See, for example, Patent Documents 1 to 5).

A typical stretchable structure of a pants-type disposable diaper is provided with elongated elastic members provided along the stretching direction and at intervals from each other between the overlapping inner and outer sheet layers. .. The inner sheet layer and the outer sheet layer form a planar elastic region and play a role of covering and hiding the elastic member, and the elastic member incorporated between the inner sheet layer and the outer sheet layer is a force for elastic expansion and contraction. It plays a role in creating. In the state of being stretched in the expansion / contraction direction, at least the portions located at both ends of the expansion / contraction region of the elastic member are fixed to the inner sheet layer and the outer sheet layer. By this fixing, the elastic member and the inner sheet layer and the outer sheet layer are integrated, and the inner sheet layer and the outer sheet layer are contracted by the contraction force of the elastic member and folds (including wrinkled ones. Only in the natural length state). However, it is also formed in the stretched state of the elastic member. Hereinafter, it is also simply referred to as a fold), and when the elastic member is stretched against the contraction force of the elastic member from this contracted state, the fold is expanded. .. Normally, the inner sheet layer and the outer sheet layer are in a developed state without folds at the elastic elongation limit, and the folds are closer to each other as the elastic member contracts, and the folds are most densely brought to the natural length state.

In such a stretchable structure, if the inner sheet layer and the outer sheet layer are free from each other, one non-woven fabric layer may partially or wholly float with respect to the other non-woven fabric layer, causing unnecessary folds and bulges. It is necessary that the inner sheet layer and the outer sheet layer are directly or indirectly joined to almost the entire surface of the inner sheet layer and the outer sheet layer. Further, since the elastic member creates elasticity, the elastic member extends over the entire expansion and contraction direction of the expansion and contraction region, and at least the portions located at both ends of the expansion and contraction direction of the expansion and contraction region are relative to the inner sheet layer and the outer sheet layer. In the natural length state, the inner sheet layer and the outer sheet layer need to be contracted as the elastic member contracts. That is, it is necessary to join the inner sheet layer and the outer sheet layer and to fix the elastic member to the inner sheet layer and the outer sheet layer.

At present, a hot melt adhesive is selected in most cases as a means for fixing the elastic member to the inner sheet layer and the outer sheet layer. On the other hand, in order to reduce the amount of hot melt adhesive used, bonding between the inner sheet layer and the outer sheet layer is often performed by welding such as ultrasonic welding, but the structure is performed by hot melt adhesive. Is also used persistently. In particular, by joining the inner sheet layer and the outer sheet layer at the position of the elastic member via a hot melt adhesive, the inner sheet layer and the outer sheet layer are joined, and the elastic member is fixed to the inner sheet layer and the outer sheet layer. The combined structure that also serves as is known as the most representative one.

On the other hand, the waist circumference region and the intermediate region overlap with the front-rear direction range having the absorber, and there are internal and external joints in the range for joining the interior body and the exterior body. Therefore, even if the elastic member is provided so as to cross the range in the front-rear direction having the absorber, its expansion / contraction function is limited by the rigidity of the absorber. In addition, the absorber may shrink in the width direction to deteriorate the wearing feeling and appearance, or the absorber may be twisted or cracked to deteriorate the absorption performance.

For this reason, conventionally, the elastic member is continuously attached to the outer body along the width direction, and the elasticity generated by the elastic member is killed at the portion overlapping with the absorber, so that the outer body is not stretchable. Regions have been formed (see, eg, Patent Documents 1-5). When fixing the elastic member with a hot melt adhesive and joining the inner sheet layer and the outer sheet layer as in the above-mentioned combined structure, the method of killing the elasticity is roughly classified into two types.

That is, the first method is a method of finely cutting a portion of the elastic member located in the non-stretchable region. The second method is to form an independent shrinkage portion that is not fixed to the inner sheet layer and the outer sheet layer or is weakly fixed by a hot melt adhesive in a portion of the elastic member located in the non-stretchable region, and the width of the independent shrinkage portion. It is a method of cutting at one place in the middle of the direction and shrinking the independently contracted portion to a state of natural length or close to the natural length without the inner sheet layer and the outer sheet layer. The second method has an advantage that the number of cutting points is as small as one as compared with the first method.

However, in the second method, since the independently contracted portion of the elastic member is not fixed to the inner sheet layer and the outer sheet layer or is weakly fixed by the hot melt adhesive, the inner sheet layer and the outer sheet layer are joined in the non-stretchable region. Is missing or weakened. As a result, the appearance may be deteriorated, for example, the outer sheet layer may be lifted from the inner sheet layer, or irregular and large wrinkles may be formed on the outer sheet layer.

On the other hand, the above problem is that when the elastic member is fixed to the inner sheet layer and the outer sheet layer with a hot melt adhesive, it may be fixed firmly to some extent even in the independently contracted portion, but in that case, a part or all of the elastic member may be fixed. The independently contracted portion of the above does not come off from the inner sheet layer and the outer sheet layer, and may shrink together with the inner sheet layer and the outer sheet layer. In this case, a good non-stretchable region is not formed, which may impair the appearance.

Special Table 2015-512296 Japanese Patent No. 5779738 Japanese Unexamined Patent Publication No. 2015-58061 Japanese Unexamined Patent Publication No. 2016-07912 Japanese Unexamined Patent Publication No. 2016-000116

Therefore, the main problem of the present invention is the non-formation formed by cutting the elastic member in one place in the elastic structure for joining the inner sheet layer and the outer sheet layer at the position of the elastic member via a hot melt adhesive. The purpose is to prevent deterioration of the appearance of the elastic region.

The pants-type disposable diapers that solve the above problems are as follows.
<First aspect>
An integrated exterior body from the front body to the back body, or an exterior body separately provided on the front body and the back body,
An interior body including an absorber attached to the exterior body so as to extend from the front body to the back body,
Side seals where both sides of the exterior body on the front body and both sides of the exterior body on the back body are joined, respectively.
With a waist opening and a pair of left and right leg openings
The exterior body has a non-stretchable region provided in the middle in the width direction and a stretchable region provided on both sides of the non-stretchable region in the front-rear direction range having the absorber.
The stretchable region includes an inner sheet layer, an outer sheet layer, and a plurality of elongated elastic members along the width direction attached to the inner sheet layer and the outer sheet layer at intervals in the front-rear direction. It is a region that elastically expands and contracts in the width direction together with the elastic member.
In the stretchable region, the inner sheet layer and the outer sheet layer are joined by a hot melt adhesive arranged at least at the position of the elastic member, and the elastic member is fixed to the inner sheet layer and the outer sheet layer. Has been
The non-stretchable region has an inner sheet layer and an outer sheet layer continuous from the stretchable region, and an independent contraction portion left between the inner sheet layer and the outer sheet layer and continuous from the elastic member of the stretchable region. , The independently contracted portion is a region contracted without the inner sheet layer and the outer sheet layer.
In the non-stretchable region, the inner sheet layer and the outer sheet layer are not joined and the independent shrinkage portion is not fixed to the inner sheet layer and the outer sheet layer, or the independent shrinkage portion is arranged at the position of the independent shrinkage portion. The inner sheet layer and the outer sheet layer are joined weaker than the expansion / contraction region by only the hot melt adhesive, and the independent shrinkage portion is an elastic member of the expansion / contraction region to the inner sheet layer and the outer sheet layer. Weakly fixed,
In pants-type disposable diapers;
The non-stretchable region has a reinforcing joint in which the inner sheet layer and the outer sheet layer are directly welded at at least one place including a central portion in both the width direction and the front-rear direction.
Pants-type disposable diapers that feature this.

(Action effect)
In the non-stretchable region of the pants-type disposable diaper, the inner sheet layer and the outer sheet layer are directly welded at at least one place including the central portion in both the width direction and the front-rear direction. Therefore, the joint between the inner sheet layer and the outer sheet layer in the non-stretchable region is reinforced, and the situation where the outer sheet layer is lifted from the inner sheet layer and the situation where irregular and large wrinkles are formed on the outer sheet layer are less likely to occur. , There is less risk of deterioration in appearance.

<Second aspect>
The reinforcing joint is provided in a dotted line or a linear shape along the width direction between the independently contracted portions adjacent to each other in the front-rear direction.
The pants-type disposable diaper of the first aspect.

(Action effect)
When the reinforcing joint has such a shape and arrangement, even if the independently contracting portion of the elastic member moves in the front-rear direction, the movement is regulated by the reinforcing joint, so that other independent contractions adjacent in the front-rear direction are performed. Does not intersect with parts. Therefore, it is possible to prevent deterioration of the appearance due to the irregular shape of the independently contracted portion of the elastic member.

<Third aspect>
The reinforcing joint portion is provided only in the central portion in the width direction of the non-stretchable region, and the lengths of the independently contracted portions on both sides in the width direction are equal.
Pants-type disposable diaper according to the first or second aspect.

(Action effect)
In this structure, the cutting of the elastic member and the formation of the reinforcing joint can be formed by simultaneous pressurization and heat processing, and the appearance including the reinforcing joint becomes symmetrical with respect to the center in the width direction. It is preferable because it is aesthetically pleasing.

<Fourth aspect>
The reinforcing joint portion is provided in a display form composed of a pattern, a picture, a character, or a combination thereof.
The pants-type disposable diaper of the first aspect.

(Action effect)
By forming the reinforcing joint portion in a display shape in this way, the design of the non-stretchable region can be improved.

<Fifth aspect>
A method for manufacturing a pants-type disposable diaper according to the first aspect.
When forming the exterior body, the elastic member is arranged in an extended state between the inner sheet layer and the outer sheet layer so as to pass through the portion that becomes the stretchable region and the portion that becomes the non-stretchable region.
In the portion to be the elastic region, the inner sheet layer and the outer sheet layer are joined by at least a hot melt adhesive applied to the peripheral surface of the elastic member, and the elastic member is attached to the inner sheet layer and the outer sheet layer. Fixed,
In the non-stretchable region, the inner sheet layer and the outer sheet layer are not joined and the independently contracted portion is not fixed to the inner sheet layer and the outer sheet layer, or the peripheral surface of the elastic member is not fixed. The inner sheet layer and the outer sheet layer are joined weaker than the portion to be the stretchable region by only the hot melt adhesive applied to the inner sheet layer and the outer sheet layer, and the elastic member is attached to the inner sheet layer and the outer sheet layer with the stretchable region. Fix it weaker than the part
After that, the elastic member is cut and heated by sandwiching it from the inside of the inner sheet layer and the outside of the outer sheet layer at one place in the width direction of the non-stretchable region, and cutting the elastic member.
Before or after cutting the elastic member, or at the same time as cutting the elastic member, pressurize and heat by sandwiching the non-stretchable region from the inside of the inner sheet layer and the outside of the outer sheet layer. The inner sheet layer and the outer sheet layer are welded together to form the reinforcing joint portion.
A method of manufacturing pants-type disposable diapers that is characterized by this.

(Action effect)
According to this manufacturing method, the pants-type disposable diaper of the first aspect can be manufactured.

<Sixth aspect>
After cutting the elastic member, the reinforcing joint is formed in a width direction range that does not have the independent contraction portion.
A method for manufacturing a pants-type disposable diaper according to a fifth aspect.

(Action effect)
It is preferable to form the reinforcing joint portion in the width direction range that does not have the independent contraction portion after cutting the elastic member because there is no possibility of pressurizing and heating the elastic member when forming the reinforcing joint portion.

<7th aspect>
Cutting the elastic member and forming the reinforcing joint portion are simultaneously performed only at the central portion in the width direction of the non-stretchable region.
A method for manufacturing a pants-type disposable diaper according to a fifth aspect.

(Action effect)
It is possible to manufacture a pants-type disposable diaper according to a third aspect, which is excellent in aesthetics.

<8th aspect>
Prior to cutting the elastic member, the reinforcing joint is formed in a dotted line or a linear shape along the width direction between the independently contracted portions adjacent in the front-rear direction.
A method for manufacturing a pants-type disposable diaper according to a fifth aspect.

(Action effect)
By forming the reinforcing joint portion in such an arrangement before cutting the elastic member, when the independently contracting portion contracts after cutting, the independently contracting portion is unlikely to have an irregular shape.

As described above, according to the present invention, in the elastic structure for joining the inner sheet layer and the outer sheet layer at the position of the elastic member via a hot melt adhesive, the elastic member is formed by cutting the elastic member in one place. There are advantages such as prevention of deterioration of the appearance of the non-stretchable region.

It is a top view in the unfolded state which shows the inner surface of a pants type disposable diaper. It is a top view in the unfolded state of the diaper which shows the outer surface of the pants type disposable diaper. It is 3-3 sectional view of FIG. It is a cross-sectional view of 4-4 of FIG. (A) is a 5-5 cross-sectional view of FIG. 1 and (b) is a 6-6 cross-sectional view of FIG. It is a perspective view of a pants type disposable diaper. It is a cross-sectional view corresponding to the 5-5 cross section of FIG. It is a top view in the unfolded state of the diaper which shows the outer surface of the pants type disposable diaper. It is (a) a plan view after cutting an elastic member, (b) a sectional view after cutting an elastic member, and (c) a sectional view before cutting an elastic member which shows a non-stretchable region and a region around it. It is (a) a plan view after cutting an elastic member, (b) a sectional view after cutting an elastic member, and (c) a sectional view before cutting an elastic member which shows a non-stretchable region and a region around it. It is (a) a plan view after cutting an elastic member, (b) a sectional view after cutting an elastic member, and (c) a sectional view before cutting an elastic member which shows a non-stretchable region and a region around it. It is (a) a plan view after cutting an elastic member, (b) a sectional view after cutting an elastic member, and (c) a sectional view before cutting an elastic member which shows a non-stretchable region and a region around it. It is a perspective view which shows the process of cutting an elastic member and forming a reinforcing joint part. It is a front view which shows typically the process of cutting various elastic members and forming a reinforcing joint part. It is (a) plan view and (b) sectional view which shows the post-processing tape part. It is sectional drawing which shows the state after peeling of a post-treatment tape. It is a perspective view which shows the state which the diaper is rolled and fixed.

Hereinafter, an example of a pants-type disposable diaper will be described in detail with reference to the attached drawings. The dotted pattern portion in the cross-sectional view shows a hot melt adhesive as a joining means for joining the constituent members located on the front side and the back side thereof. The hot melt adhesive can be applied by a known method such as slot coating, continuous linear or dotted bead coating, spiral or Z-shaped spray coating, or pattern coating (transfer of hot melt adhesive by the letterpress method). Can be applied. Alternatively or in conjunction with this, at the fixed portion of the elastic member, a hot melt adhesive can be applied to the outer peripheral surface of the elastic member to fix the elastic member to the adjacent member. Examples of the hot melt adhesive include EVA type, adhesive rubber type (elastomer type), olefin type, polyester / polyamide type and the like, but they can be used without particular limitation. As the joining means for joining the constituent members, a means by welding materials such as a heat seal and an ultrasonic seal can also be used.

Further, as the non-woven fabric in the following description, a known non-woven fabric can be appropriately used depending on the site and purpose. Examples of the constituent fibers of the non-woven fabric include olefin-based fibers such as polyethylene and polypropylene, polyester-based and polyamide-based synthetic fibers (including single-component fibers and composite fibers such as core sheaths), as well as recycled rayon and cupra. Fibers, natural fibers such as cotton, and the like can be selected without particular limitation, and these can be mixed and used. In order to increase the flexibility of the non-woven fabric, it is preferable that the constituent fibers are crimped fibers. Further, even if the constituent fibers of the non-woven fabric are hydrophilic fibers (including hydrophobic fibers made hydrophilic by the hydrophilic agent), they are either hydrophobic fibers or water-repellent fibers (water-repellent fibers made water-repellent by the water-repellent agent). It may be (including aqueous fibers). In addition, the non-woven fabric generally has a short fiber non-woven fabric, a long fiber non-woven fabric, a spunbond non-woven fabric, a melt blown non-woven fabric, a spunlace non-woven fabric, a thermal bond (air-through) non-woven fabric, and a needle punch depending on the fiber length, the sheet forming method, the fiber bonding method, and the laminated structure. Non-woven fabric, point-bonded non-woven fabric, laminated non-woven fabric (SSS non-woven fabric in which the same or similar non-woven fabric layer is laminated, SMS non-woven fabric in which different non-woven fabric layers are laminated, and a melt blown layer sandwiched between spunbond layers, SMMS non-woven fabric, etc.), etc. Any of these non-woven fabrics can be used.

1 to 6 show a pants-type disposable diaper 100. This pants type disposable diaper 100 extends from the front exterior body 12F constituting the front body F, the rear exterior body 12B constituting the rear body B, and the rear exterior body 12B from the front exterior body 12F through the crotch portion. The front side is provided with the front exterior body 12F, and the rear side is provided with the interior body 200 fixed to the rear exterior body 12B, and both side portions of the front exterior body 12F and both side portions of the rear exterior body 12B are joined. Side seal portions 12A are formed, and the openings formed by the front and rear ends of the exterior bodies 12F and 12B serve as waist openings WO through which the wearer's body passes, and the exterior bodies 12F and 12B are formed on both sides of the interior body 200 in the width direction WD. The portion surrounded by the lower edge and the side edge of the interior body 200 is a leg opening LO through which the legs pass. The interior body 200 is a portion that absorbs and holds excrement such as urine, and the exterior body 12 is a portion that supports the interior body 200 with respect to the wearer's body. Further, the reference numeral Y indicates the total length of the diaper in the unfolded state (the length in the front-rear direction from the edge of the waist opening WO of the front body F to the edge of the waist opening WO of the back body B), and the reference numeral X indicates the diaper in the unfolded state. Shows the full width of.

Further, the pants type disposable diaper 100 has a waist circumference region T defined as a front-rear direction range (a front-back direction range from the waist opening WO to the upper end of the leg opening LO) having a side seal portion 12A, and a portion forming the leg opening LO. It has an intermediate region L defined as a front-rear direction range (between a front-rear direction region having a side seal portion 12A of the front body F and a front-rear direction region having a side seal portion 12A of the back body B). The waist circumference region T can be divided into a "waist portion" W that conceptually forms an edge portion of the waist opening and a "waist lower portion" U that is a portion below this. Normally, when there is a boundary in the waist circumference region T where the tensile stress in the width direction changes (for example, the thickness and elongation rate of the elastic member change), the waist opening WO side is the waist rather than the boundary on the waist opening WO side. If there is no such boundary, the waist portion W is formed on the waist opening WO side of the absorber 56 or the interior body 200. The length in the front-rear direction varies depending on the size of the product and can be appropriately determined. For example, the waist portion W can be 15 to 40 mm and the waist lower portion U can be 65 to 120 mm. On the other hand, both side edges of the intermediate region L are constricted in a U-shape or a curved shape along the circumference of the wearer's legs, and this is a portion for inserting the wearer's legs. As a result, the unfolded pants-type disposable diaper has an hourglass shape as a whole.

(Interior body)
The interior body 200 can have any shape, but in the illustrated example, it is rectangular. As shown in FIGS. 3 to 5, the interior body 200 includes a top sheet 30 on the body side, a liquid-impermeable sheet 11, and an absorbing element 50 interposed between them. Yes, it is the main body that has an absorption function. Reference numeral 40 indicates an intermediate sheet (second sheet) provided between the top sheet 30 and the absorption element 50 in order to quickly transfer the liquid that has passed through the top sheet 30 to the absorption element 50. Indicates a rising gather 60 that stands up on the body side and is provided on both sides of the interior body 200 in order to prevent excrement from leaking to both sides of the interior body 200.

The interior body 200 can be fixed to the exterior bodies 12F and 12B by joining means such as heat sealing and ultrasonic sealing by welding materials, or by a hot melt adhesive. In the illustrated example, the back surface of the interior body 200, that is, in this case, the back surface of the liquid-impermeable sheet 11 and the mounting portion 65 of the rising gather 60 are fixed to the inner surface of the exterior body 12 by a hot melt adhesive. There is. The inner / outer fixing portions 201 for fixing the inner body 200 and the outer bodies 12F and 12B can be provided in almost the entire area where the two overlap, and are usually provided in a portion of the interior body 200 excluding both ends in the width direction WD. It is preferable to provide it.

(Top sheet)
The top sheet 30 has a property of allowing liquid to permeate, and examples thereof include a perforated or non-perforated non-woven fabric and a porous plastic sheet.

When the rising gathers 60 are provided, both side portions of the top sheet 30 pass between the liquid permeable sheet 11 and the rising gathers 60 and wrap around to the back side of the absorbing element 50 to form the liquid permeable sheet 11 and the rising gathers 60. Can be joined against each other.

The top sheet 30 may be fixed to a member adjacent to the back side by a joining means by material welding such as heat seal or ultrasonic seal, or by a hot melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated example, the top sheet 30 is fixed to the surface of the intermediate sheet 40 and the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by a hot melt adhesive applied to the back surface thereof.

(Intermediate sheet)
In order to quickly transfer the liquid that has permeated the top sheet 30 to the absorber, an intermediate sheet 40 having a faster liquid permeation speed than the top sheet 30 can be provided. The intermediate sheet 40 can not only quickly transfer the liquid to the absorber to improve the absorption performance by the absorber, but also prevent the absorbed liquid from returning from the absorber. The intermediate sheet 40 may be omitted.

Examples of the intermediate sheet 40 include the same materials as the top sheet 30, spunlace non-woven fabric, spunbonded non-woven fabric, SMS non-woven fabric, pulp non-woven fabric, mixed sheet of pulp and rayon, point-bonded non-woven fabric or crepe paper. In particular, the air-through non-woven fabric is preferable because it is bulky. It is preferable to use a composite fiber having a core-sheath structure for the air-through non-woven fabric. In this case, the resin used for the core may be polypropylene (PP), but polyester (PET) having high rigidity is preferable. Basis weight is preferably ^{20~80g / m 2, 25~60g / m} 2 is more preferable. The thickness of the fibers of the non-woven fabric is preferably 2.0 to 10 dtex. In order to make the non-woven fabric bulky, it is also preferable to use eccentric fibers having no core in the center, hollow fibers, and eccentric and hollow fibers as mixed fibers of all or a part of the fibers.

Although the intermediate sheet 40 of the illustrated example is arranged in the center shorter than the width of the absorber 56, it may be provided over the entire width. The length of the intermediate sheet 40 in the longitudinal direction may be the same as the length of the absorber 56, or may be within a short length range centered on the region for receiving the liquid.

The intermediate sheet 40 may be fixed to a member adjacent to the back side by a joining means by material welding such as a heat seal or an ultrasonic seal or a hot melt adhesive for the purpose of preventing misalignment with respect to the member on the back side. desirable. In the illustrated example, the intermediate sheet 40 is fixed to the surface of the portion of the packaging sheet 58 located on the front side of the absorber 56 by the hot melt adhesive applied to the back surface thereof.

(Liquid impermeable sheet)
The material of the liquid-impermeable sheet 11 is not particularly limited, but for example, a plastic film made of an olefin resin such as polyethylene or polypropylene, a laminated non-woven fabric having a plastic film on the surface of the non-woven fabric, or a plastic film. An example can be exemplified of a laminated sheet in which a non-woven fabric or the like is laminated and joined. For the liquid impermeable sheet 11, it is preferable to use a material having impermeable and moisture permeable properties, which is preferably used from the viewpoint of preventing stuffiness. As a moisture-permeable plastic film, a microporous plastic film obtained by kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, forming a sheet, and then stretching in a uniaxial or biaxial direction. Is widely used. In addition to this, a liquid-impermeable sheet that does not use a plastic film, such as a non-woven fabric coated with a water-repellent agent using microdenier fibers, can also be used as the liquid-impermeable sheet 11.

As shown in the figure, the liquid-impermeable sheet 11 has a width that fits on the back side of the absorbing element 50, and in order to improve leakage resistance, both sides of the absorbing element 50 are wrapped around the side surface of the top sheet 30 of the absorbing element 50. It can also be extended to both sides.

(Get up gather)
The rising gather 60 is a band-shaped member extending in the entire front-rear direction along both side portions of the interior body 200, and is for blocking excrement that travels laterally along the top sheet 30 and prevents lateral leakage. It is provided in. The rising gather 60 of this example is provided so as to stand up from the side portion of the interior body 200, the portion on the base side stands up diagonally toward the center side of the WD in the width direction, and the portion on the tip side from the intermediate portion is wide. It stands diagonally toward the outside of the direction WD.

More specifically, the rising gather 60 folds the strip-shaped gather sheet 62 having a length equal to the length in the front-rear direction of the interior body 200 in the width direction WD and folds it in two, and the folded portion and the sheet in the vicinity thereof. In between, a plurality of elongated gather elastic members 63 are fixed in an elongated state along the longitudinal direction at intervals in the width direction WD. The base end portion (the end portion opposite to the seat folded portion in the width direction WD) located on the opposite side of the rising gather 60 is the mounting portion 65 fixed to the back surface of the side edge portion of the interior body 200. The portion other than the mounting portion 65 is a protruding portion 66 (a portion on the folded-back portion side) protruding from the mounting portion 65. Further, the protruding portion 66 is composed of a root side portion toward the center side of the width direction WD and a tip side portion folded outward from the tip end of the root side portion to the outside of the width direction WD. This is a surface contact type rising gather, but a line contact type rising gather (not shown) that does not fold back to the outside of the width direction WD can also be adopted. Of the protruding portions 66, both ends in the front-rear direction are fixed to the side surface of the top sheet 30 in an inverted state, while the front-rear fixing portions 67 located between them are not. It is a fixed free portion 68, and a gather elastic member 63 along the front-rear direction is fixed to the free portion 68 in an extended state.

In the free portion 68 of the rising gather 60, a hot melt adhesive, a heat seal, and ultrasonic waves are used for bonding the inner layer and the outer layer of the gather sheet 62 and fixing the gather elastic member 63 sandwiched between them by various coating methods. At least one of the fixing means by welding the material such as a seal can be used. If the entire inner and outer layers of the gather sheet 62 are bonded together, the flexibility is impaired. Therefore, it is preferable that the parts other than the adhesive portion of the gather elastic member 63 are not adhered or are weakly adhered. In the illustrated example, the gather elastic member 63 is sandwiched between the inner layer and the outer layer of the gather sheet 62 by applying a hot melt adhesive only to the outer peripheral surface of the gather elastic member 63 by a coating means such as a comb gun or a sure wrap nozzle. With only the hot melt adhesive applied to the outer peripheral surface of the gather sheet 62, the gather elastic member 63 is fixed to the inner layer and the outer layer of the gather sheet 62, and the inner layer and the outer layer of the gather sheet 62 are fixed. There is.

Further, for fixing the waterproof film 64 incorporated in the rising gather 60 and the gather sheet 62 and fixing the front and rear fixing portions 67 to the side surface of the interior body 200, hot melt adhesives and heat seals by various coating methods are used. At least one of the means by welding the material 63 such as or ultrasonic seal can be used. In the illustrated example, slot application of hot melt adhesive is used to fix the waterproof film 64. Further, although the front and rear fixing portions 67 in the illustrated example are fixed by a combination of hot melt adhesive and material welding means, these fixing can be performed by only one of the means.

As the gather sheet 62, a flexible, uniform and concealing non-woven fabric such as a spunbonded non-woven fabric (SS, SSS, etc.), an SMS non-woven fabric (SMS, SMSMS, etc.), a melt-blown non-woven fabric, etc. The treated material can be preferably used, and the fiber texture is preferably about 10 to 30 g / m ² . As the gather elastic member, rubber thread or the like can be used. When spandex rubber is used, the thickness is preferably 470 to 1240 dtex, more preferably 620 to 940 dtex. The elongation rate at the time of fixing is preferably 150 to 350%, more preferably 200 to 300%. Further, as shown in the drawing, the waterproof film 64 can be interposed between the gather sheets folded in two.

The number of gather elastic members provided in the free portion of the rising gather 60 is preferably 2 to 6, and more preferably 3 to 5. The arrangement interval 60d is preferably 3 to 10 mm. With such a configuration, it becomes easy to hit the skin on the surface within the range in which the gathered elastic member is arranged. Gathered elastic members may be arranged not only on the tip side but also on the base side.

The object of fixing the mounting portion 65 of the rising gather 60 can be an appropriate member such as the top sheet 30, the liquid-impermeable sheet 11, and the absorbing element 50 in the interior body 200.

In the rising gather 60 having the above structure, the contraction force of the gather elastic member acts to bring both ends in the front-rear direction closer to each other, but the both ends in the front-rear direction of the protruding portion 66 are fixed so as not to stand up. Since there is a non-fixed free part between them, only the free part stands so as to abut on the body side as shown in FIG. In particular, when the mounting portion 65 is located on the back surface side of the interior body 200, the rising gather 60 stands up so as to open to the outside of the WD in the width direction in the crotch portion and its vicinity, so that the rising gather 60 faces around the legs. It comes into contact with, and the fit is improved.

(Absorption element)
The absorbing element 50 has an absorbing body 56 and a packaging sheet 58 that encloses the entire absorbing body 56. The packaging sheet 58 may be omitted.

(Absorber)
The absorber 56 can be formed by an aggregate of fibers. The fiber aggregate is a filament aggregate obtained by stacking short fibers such as cotton-like pulp and synthetic fibers, and opening tow (fiber bundle) of synthetic fibers such as cellulose acetate as necessary. Can also be used. The basis weight of fibers, when fiber stacking flocculent pulp or short fibers, for example, be a 100 to 300 g / m ² approximately, in the case of a filament aggregate, for example, be 30 to 120 g / m ² approximately Can be done. In the case of synthetic fibers, the fineness is, for example, 1 to 16 dtex, preferably 1 to 10 dtex, and more preferably 1 to 5 dtex. In the case of a filament aggregate, the filament may be a non-crimped fiber, but is preferably a crimped fiber. The degree of crimping of the crimped fibers can be, for example, 5 to 75 fibers per 2.54 cm, preferably 10 to 50 fibers, and more preferably about 15 to 50 fibers. In addition, uniformly crimped crimped fibers can be used. It is preferable to disperse and hold the highly absorbent polymer particles in the absorber 56.

The absorber 56 may have a rectangular shape, but as shown in FIGS. 1 and 2, the absorber 56 is located at the front end portion, the rear end portion, and between them, and has a constricted portion that is narrower than the front end portion and the rear end portion. It is preferable to have an hourglass shape having the above, because the fit of the absorber 56 itself and the rising gather 60 around the legs is improved.

The size of the absorber 56 can be appropriately determined as long as it extends from the front, back, left and right of the urination port position, but it is preferable that the absorber 56 extends to the peripheral edge of the interior body or its vicinity in the front-back direction and the width direction WD. Reference numeral 56X indicates the width of the absorber 56.

(Highly absorbent polymer particles)
The absorber 56 may contain high-absorbent polymer particles in part or all of the absorber 56. The highly absorbent polymer particles include "powder" in addition to "particles". As the highly absorbent polymer particles, those used for this type of disposable diaper can be used as they are, for example, sieved by sieving (shaking for 5 minutes) using a standard sieve (JIS Z8801-1: 2006) of 500 μm. It is desirable that the proportion of particles remaining on the sieve is 30% by weight or less, and the proportion of particles remaining on the sieve is 60 by sieving (shaking for 5 minutes) using a standard sieve of 180 μm (JIS Z8801-1: 2006). It is desirable that the weight is% or more.

The material of the highly absorbent polymer particles can be used without particular limitation, but those having a water absorption of 40 g / g or more are preferable. Highly absorbent polymer particles include starch-based, cellulosic-based and synthetic polymer-based ones, which are starch-acrylic acid (salt) graft copolymers, saponified starch-acrylonitrile copolymers, and crosslinked sodium carboxymethyl cellulose. A substance or an acrylic acid (salt) polymer or the like can be used. As the shape of the highly absorbent polymer particles, a powder or granular material that is usually used is preferable, but other shapes can also be used.

As the highly absorbent polymer particles, those having a water absorption rate of 70 seconds or less, particularly 40 seconds or less are preferably used. If the water absorption rate is too slow, the liquid supplied into the absorber 56 tends to return to the outside of the absorber 56, so-called reversion.

Further, as the highly absorbent polymer particles, those having a gel strength of 1000 Pa or more are preferably used. As a result, even when the bulky absorber 56 is used, the sticky feeling after liquid absorption can be effectively suppressed.

The amount of the highly absorbent polymer particles to be grained can be appropriately determined according to the amount of absorption required for the application of the absorber 56. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . If the polymer coating amount is less than 50 g / m ² , it becomes difficult to secure the absorption amount. Above 350 g / m ² , the effect saturates.

If necessary, the highly absorbent polymer particles can adjust the spray density or the spray amount in the plane direction of the absorber 56. For example, the amount of liquid excreted at the site can be increased as compared with other sites. When considering the difference between men and women, the spray density (amount) on the front side can be increased for men, and the spray density (amount) on the central part can be increased for women. Further, it is also possible to provide a portion where the polymer does not exist locally (for example, in a spot shape) in the plane direction of the absorber 56.

(Packaging sheet)
When the packaging sheet 58 is used, as the material thereof, tissue paper, particularly crepe paper, non-woven fabric, non-woven fabric of polylami, sheet having small holes, or the like can be used. However, it is desirable that the sheet does not allow the highly absorbent polymer particles to escape. When a non-woven fabric is used instead of the crepe paper, a hydrophilic SMS non-woven fabric (SMS, SMSMS, etc.) is particularly suitable, and polypropylene, polyethylene / polypropylene composite material, or the like can be used as the material. The texture is preferably 5 to 40 g / m ² , especially 10 to 30 g / m ² .

The packaging structure of the packaging sheet 58 can be appropriately determined, but from the viewpoint of ease of manufacture and prevention of leakage of highly absorbent polymer particles from the front and rear edge edges, a cylinder is provided so as to surround the front and back surfaces and both side surfaces of the absorber 56. It is preferable that the structure is wound in a shape, the front and rear edges thereof are projected from the front and rear of the absorber 56, and the overlapping portion and the overlapping portion of the front and rear protruding portions are joined by a joining means such as hot melt adhesive or material welding.

(Exterior body)
The exterior bodies 12F and 12B are composed of a front exterior body 12F which is a part constituting the front body F and a rear exterior body 12B which is a part constituting the rear body B, and the front exterior body 12F and the rear exterior body 12B. Are not continuous on the crotch side and are separated in the front-back direction. The separation distance 12d can be about 150 to 250 mm. A part of the exposed portion on the back surface of the interior body 200 in this separated portion (for example, the entire portion exposed between the front exterior body 12F and the rear exterior body 12B in the front-rear direction, but does not extend to the front-rear end of the interior body 200. It is desirable to attach the interior cover sheet 12M made of a non-woven fabric or the like so as to cover both edges of the interior body 200 so as not to reach both edges of the interior body 200), but it may be omitted. Further, as shown in FIG. 8, the exterior body 12 can be integrated through the crotch from the front body F to the back body B.

The exterior bodies 12F and 12B have a waist circumference portion that is a range in the front-rear direction corresponding to the waist circumference region T. Further, in this example, the front exterior body 12F does not have a portion corresponding to the intermediate region L, but the rear exterior body 12B has a buttock cover portion 14 extending from the waist circumference region T to the intermediate region L side. are doing. Although not shown, the front exterior body 12F may also be provided with a groin cover portion extending from the waist circumference region T to the intermediate region L side, or the front exterior body 12F and the front exterior body 12F may be provided with a groin cover portion but not a buttock cover portion. It is not necessary to provide a portion corresponding to the intermediate region L on both of the rear exterior bodies 12B. Further, in the illustrated example, the lower edge of the buttock cover portion 14 is formed in a straight line along the WD in the width direction like the lower edge of the front exterior body 12F, but the waist opening WO is formed toward the outside of the WD in the width direction. It can also be a curve that comes to be located on the side.

As shown in FIGS. 3 to 5, the exterior bodies 12F and 12B are formed by joining the outer sheet layer 12S and the inner sheet layer 12H by a joining means such as a hot melt adhesive or welding. The sheet material forming the outer sheet layer 12S and the sheet material forming the inner sheet layer 12H are individual sheet materials as shown in the example shown in FIG. 5, and a common sheet material as shown in the example shown in FIG. It can also be used as a sheet material. That is, in the latter case, the inner sheet layer 12H and the outer sheet layer 12S are formed by the inner portion and the outer portion of one sheet material folded back at the waist side edge (may be the crotch side edge), respectively. .. In the former example, since the number of folding steps of the sheet material is small, there is an advantage that the inner sheet layer 12H and the outer sheet layer 12S are not easily displaced, and in the latter example, the number of sheet material materials is small. There is.

If the edges of the sheet material forming the outer sheet layer 12S and the inner sheet layer 12H and the front and rear ends of the interior body 200 are exposed to the waist opening WO, the corners of the sheet material may hit the skin and the feel may deteriorate. Part W The elastic member and the hot melt adhesive for fixing the elastic member may be exposed. Therefore, as in the example shown in FIG. 5, the sheet material forming the outer sheet layer 12S wraps around the waist side edge of the sheet material forming the inner sheet layer 12H and is folded back inside to form the inner surface layer. It is preferable that the inner surface layer 12r extends over the waist-side end of the interior body 200.

The sheet material used for the outer sheet layer 12S and the inner sheet layer 12H is not particularly limited, but for example, various non-woven fabrics made of a thermoplastic resin can be preferably used. When a non-woven fabric is used, the texture is preferably about 10 to 30 g / m ² .

(Expandable area)
The exterior bodies 12F and 12B of the illustrated example are provided with elongated elastic members 15 to 18 such as rubber threads between the outer sheet layer 12S and the inner sheet layer 12H in order to improve the fit to the waist circumference of the wearer. An expansion / contraction region A1 that is attached at an extension rate and elastically expands / contracts in the waist circumference direction is formed together with the elastic members 15-18. As the elastic members 15 to 18, synthetic rubber or natural rubber may be used.

In the stretchable region A2, the inner sheet layer 12H and the outer sheet layer 12S are joined by the hot melt adhesive H1 arranged at least at the positions of the elastic members 15 to 18, and the inner sheet layer 12H and the outer sheet layer 12S are elastic. Members 15 to 18 are fixed. Therefore, as shown in FIG. 2, the elastic members 15 to 18 are fixed to the inner sheet layer 12H and the outer sheet layer 12S in the expansion / contraction region A2 only by the hot melt adhesive H1 arranged at the positions of the elastic members 15 to 18. It may have been done. In this structure, the hot melt adhesive H1 is not applied to the inner sheet layer 12H and the outer sheet layer 12S, and the hot melt adhesive H1 is applied to the outer peripheral surfaces of the elastic members 15 to 18 by an application means such as a comb gun or a sure wrap nozzle. It can be manufactured by applying it and sandwiching it between both sheet layers 12S and 12H. As shown in FIG. 8, a reinforcing hot melt adhesive H2 may be added to both ends of the expansion / contraction region A2 in the width direction WD. In the example shown in FIG. 8, a portion of either the inner sheet layer 12H or the outer sheet layer 12S that becomes both ends of the stretchable region by slot coating or pattern coating (transfer of hot melt adhesive by the letterpress method). The hot melt adhesive H2 for reinforcement is applied to the surface, and the hot melt adhesive H1 is applied only to the outer peripheral surfaces of the elastic members 15 to 18 by a coating means such as a comb gun or a sure wrap nozzle, and between the sheet layers 12S and 12H. It can be manufactured by sandwiching it between.

The arrangement of the elastic members 15 to 18 is not particularly limited as long as the expansion / contraction region A1 is provided, but the illustrated example will be described in more detail as follows. That is, a plurality of waist elastic members 18 are spaced apart in the front-rear direction between the outer sheet layer 12S and the inner sheet layer 12H in the waist portions W of the exterior bodies 12F and 12B so as to be continuous over the entire width direction WD. And, it is attached in a state of being extended along the width direction WD at a predetermined extension rate. Further, among the waist elastic members 18, one or a plurality of the waist elastic members 18 arranged in the region adjacent to the lower waist U may overlap with the interior body 200, or may overlap with the interior body 200 in the width direction WD. It may be provided on both sides thereof except for the central portion of the. The waist elastic member 18 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber such as spandex. In the case of natural rubber, the cross section is 0.05 to 1.5 mm ² , especially 0.1. It is preferable to attach 3 to 22 rubber threads (about 1.0 mm ² ) at intervals of 4 to 12 mm, each having an elongation rate of 150 to 400%, particularly 220 to 320%. Further, it is not necessary for all of the waist elastic members 18 to have the same thickness and elongation rate, and for example, the thickness and extension rate may be different between the upper portion and the lower portion of the waist portion W.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the waist lower portion U of the exterior bodies 12F and 12B, a plurality of waist lower portion elastic members 15 and 17 made of elastic members are spaced apart in the front-rear direction. Moreover, it is attached in a state of being extended along the width direction WD at a predetermined extension rate.

The elastic members 15 and 17 at the lower waist have a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross section of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, especially 0.1 to 0). the rubber thread of 1.0mm about ^2), 1 to 15 mm, particularly 5 to 30 present approximately at intervals of 3 to 8 mm, respectively elongation 200-350%, preferably mounted in particular at about 240 to 300%.

Further, between the outer sheet layer 12S and the inner sheet layer 12H in the buttock cover portion 14 of the posterior exterior body 12B, a plurality of cover portion elastic members 16 made of elastic members are spaced apart in the front-rear direction and are predetermined. It is attached in a state of being extended along the width direction WD at an extension rate.

The cover elastic member 16 has a thickness of 155 to 1880 dtex, particularly about 470 to 1240 dtex (in the case of synthetic rubber, a cross section of 0.05 to 1.5 mm ^{2 in} the case of natural rubber, particularly 0.1 to 1.0 mm. ^It is preferable to attach 2 to 10 rubber threads at intervals of 5 to 40 mm, particularly 5 to 20 mm, with an elongation rate of 150 to 300%, particularly 180 to 260%.

When the inguinal cover portion is provided on the front exterior body 12F, the cover portion elastic member can be provided in the same manner.

(Non-stretchable area)
When the elastic members 15 to 17 are provided in the front-rear direction range having the absorber 56 as in the lower waist portion U and the buttock cover portion 14 of the illustrated example, the width direction WD of the absorber 56 is partially or wholly formed. In order to prevent shrinkage, in the anteroposterior range having the absorber 56, the middle of the width direction WD including a part or all of the portion overlapping the absorber 56 and the width direction WD (preferably including the entire inner / outer fixing portion 201). Is a non-stretchable region A1, and both sides of the width direction WD are preferably stretchable regions A2 over the entire width direction WD.

The non-stretchable region A1 is continuous from the elastic members 15 to 17 of the stretchable region A2 interposed between the inner sheet layer 12H and the outer sheet layer 12S continuous from the stretchable region A2 and the inner sheet layer 12H and the outer sheet layer 12S. It is a region having an independent contraction portion 19 and the like. The independent contraction portion 19 is a portion of the elastic members 15 to 17 that contracts without the inner sheet layer 12H and the outer sheet layer 12S. In the non-stretchable region A1, the inner sheet layer 12H and the outer sheet layer 12S are not joined and the independent shrinkage portion 19 is not fixed to the inner sheet layer 12H and the outer sheet layer 12S in order to form the independent shrinkage portion 19. Is preferable. Of course, the inner sheet layer 12H and the outer sheet layer 12S are joined to the inner sheet layer 12H and the outer sheet layer 12S weaker than the elastic region A2 only by the hot melt adhesive arranged at the position of the independent shrinkage portion 19. The independent contraction portion 19 may be fixed weaker than the elastic members 15 to 17 of the expansion / contraction region A2. Therefore, the application amount of the hot melt adhesive located in the independent shrinkage portion 19 can be made smaller than the application amount of the hot melt adhesive in the expansion / contraction region A2.

The non-stretchable region A1 has a reinforcing joint portion 23 in which the inner sheet layer 12H and the outer sheet layer 12S are directly welded at at least one place including the central portion in both the width direction WD and the front-rear direction LD. Is preferable. The reinforcing joint portion 23 reinforces the joint between the inner sheet layer 12H and the outer sheet layer 12S in the non-stretchable region A1, and the outer sheet layer 12S rises from the inner sheet layer 12H, or the outer sheet layer 12S is irregular. It is less likely that large wrinkles will occur, and there is less risk of deterioration in appearance.

The shape and arrangement of the reinforcing joint portion 23 in the non-stretchable region A1 can be appropriately determined. The shape of the reinforcing joint 23 is, for example, a dotted line as shown in FIGS. 9 and 11, a continuous line as shown in FIG. 12, and a staggered or other point arrangement (points) as shown in FIG. (Arrangement in which the reinforcing joints 23 are arranged at intervals in a regular or irregular pattern) can be formed. The arrangement of the reinforcing joint portion 23 is preferably intermittent in at least one of the front-rear direction LD and the width direction WD. Further, as for the arrangement of the reinforcing joint portion 23, for example, as shown in FIGS. 9 and 10, it is preferable to provide the reinforcing joint portion 23 uniformly to some extent over the entire front-rear direction LD and the width direction WD in the non-stretchable region A1. , The width direction WD may be provided only at one place (FIG. 12) over the entire front-rear direction LD, or, although not shown, it may be provided only at the central portion in both the width direction WD and the front-rear direction LD.

When the arrangement of the reinforcing joints 23 is a point arrangement or a dotted line, each reinforcing joint 23 has an arbitrary shape such as a polygon such as a perfect circle, an ellipse, a triangle, a rectangle, a rhombus, a star shape, or a cloud shape. Can be. In this case, the dimensions of the individual reinforcing joints 23 are not particularly limited, but the maximum dimension of the front-rear LD is preferably 0.5 to 4 mm, particularly 1-3 mm, and the maximum dimension of the width direction WD is 0.5. It is preferably ~ 4 mm, particularly 1-3 mm. The distance between the LDs in the front-rear direction is preferably 2 to 5 mm, particularly preferably 3 to 5 mm, and the distance between the WDs in the width direction is preferably 0.5 to 4 mm, particularly preferably 1 to 3 mm.

For example, as shown in FIG. 9, it is preferable that the reinforcing joint portion 23 is provided in a dotted line or a linear shape along the width direction WD at a gap portion between the independent contraction portions 19 adjacent to the front-rear direction LD. .. In this case, it is preferable that the reinforcing joints 23 are arranged in each of the spaced portions, and it is more preferable that the reinforcing joints 23 are also arranged at both ends of the front-rear LD in the non-stretchable region A1. Reinforcing joints 23 may be arranged only in a part of the interval portion (for example, only the central portion of the front-rear direction LD or every other part of the front-rear direction LD). As a result, even if the independent contraction portions 19 of the elastic members 15 to 17 move in the front-rear direction LD, the movement is restricted by the reinforcing joint portion 23, so that the independent contraction portions 19 intersect with other independent contraction portions 19 adjacent to the front-rear direction LD. There is nothing to do. Therefore, it is possible to prevent deterioration of the appearance due to the irregular shape of the independently contracted portions 19 of the elastic members 15 to 17.

Although not shown, the reinforcing joint portion 23 displays patterns, pictures (including characters), characters (function display such as usage method, usage assistance, size, etc., or mark display such as manufacturer, product name, characteristic function, etc.). Etc.) or a display consisting of a combination of these may be provided. As a result, the design of the non-stretchable region A1 can be improved.

As shown in FIGS. 9 and 10, the independent contraction portion 19 may be only continuous from the elastic members 15 to 17 of the elastic region A2 on one side of the WD in the width direction, or as shown in FIGS. 11 and 12. At the positions of the elastic members 15 to 17 in the front-rear direction LD, those continuous from the elastic members 15 to 17 in the expansion / contraction region A2 on both sides of the WD in the width direction may exist. Although not shown, those continuous from the elastic members 15 to 17 of the expansion and contraction region A2 on one side of the width direction WD and those continuous from the elastic members 15 to 17 of the expansion and contraction region A2 on the other side of the width direction WD are LDs in the front-rear direction. May be staggered.

As shown in FIGS. 11 and 12, when the lengths of the independent contracting portions 19 on both sides of the WD in the width direction are equal, the appearance is symmetrical with respect to the center of the WD in the width direction, which is preferable in that the appearance is excellent. Of course, as in the examples shown in FIGS. 9 and 10, the lengths of the independent contraction portions 19 on both sides of the WD in the width direction may be different.

When forming the exterior body 12 in the manufacture of the pants-type disposable diaper, as shown in FIG. 14, the inner sheet layer 12H and the outer sheet layer pass through the portion that becomes the elastic region A2 and the portion that becomes the non-expandable region A1. The elongated elastic members 15 to 18 are continuously arranged between the 12S in a state of being extended in the longitudinal direction. At this time, in the portion to be the elastic region A2, the inner sheet layer 12H and the outer sheet layer 12S are joined via the hot melt adhesive H1 applied to the peripheral surfaces of the elastic members 15 to 18, and the inner sheet layer 12H and the outer side are joined. Elastic members 15 to 18 are fixed to the sheet layer 12S. Further, in the portion to be the non-stretchable region A1, the inner sheet layer 12H and the outer sheet layer 12S are not joined, and the independent shrinkage portion 19 is not fixed to the inner sheet layer 12H and the outer sheet layer 12S. In the non-stretchable region A1, the inner sheet layer 12H and the outer sheet layer 12S are joined weaker than the stretchable region A2 only by the hot melt adhesive applied to the peripheral surfaces of the elastic members 15 to 17. The elastic members 15 to 17 may be fixed to the inner sheet layer 12H and the outer sheet layer 12S weaker than the portion to be the expansion / contraction region A2.

Then, the elastic members 15 to 17 are cut by sandwiching them from the inside of the inner sheet layer 12H and the outside of the outer sheet layer 12S at one place in the width direction WD of the portion to be the non-stretchable region A1 and pressurizing and heating. By this cutting, a cutting trace 22 (compression trace or melting trace) remains in the pressurized and heated portion of the product. Further, since the elastic members 15 to 18 remaining in the non-stretchable region A1 are not fixed (or weakly fixed) to the sheet layer and the outer sheet layer inside, they shrink to the inner sheet layer 12H and the outer sheet layer 12S. As a result of the movement, the independent contraction portion 19 having a natural length or a state close to the natural length is formed, and the non-stretchable region A1 is not stretchable.

Although not shown, a separately manufactured interior body is sequentially attached to the continuous body of the exterior bodies 12F and 12B formed in this manner, and the parts that become individual diapers after being folded so as to overlap the front and back thereof. Pants-type disposable diapers can be manufactured by forming side seal portions 12A on both sides of the boundary and further cutting at the boundary.

FIG. 13 shows a cutting step of the elastic members 15 to 17 in forming the exterior bodies 12F and 12B, and the outer peripheral surface is provided with a pressing portion 71 having a cutting convex portion 72 formed in a predetermined cutting pattern for cutting. The display sheet 25 and the elastic member 15 to the inner sheet layer 12H and the outer sheet layer 12S are formed by the seal roll 70 in which the convex portion 72 is heated to a desired temperature and the surface-smooth anvil roll 80 arranged opposite to the seal roll 70. The cutting target to which the 18 is attached is sandwiched so that the inner sheet layer 12H is on the seal roll side (may be the opposite side), and only the portion sandwiched between the cutting convex portion 72 and the outer peripheral surface of the anvil roll 80 is an elastic member. 15 to 17 are pressurized and heated to cut. The heating temperature for cutting the elastic members 15 to 17 (the temperature of the cutting convex portion) may be appropriately determined as long as the elastic members 15 to 17 can be cut reliably, but even if the production line is high speed, the elastic member 15 In order to reliably cut ~ 17 and prevent the cut portion of the elastic members 15 to 17 from adhering to the surrounding members, and to weld the outer sheet layer 12S and the inner sheet layer 12H at the cutting position, the elastic member 15 Although the temperature is lower than the melting point of ~ 17, it is preferable that the temperature is sufficiently high. For example, when the melting point of the non-woven fabric used for the outer sheet layer 12S and the inner sheet layer 12H is about 160 to 175 ° C. and the melting point of the elastic members 15 to 17 is about 200 to 230 ° C., the heating temperature is 180 to 200 ° C. Can be ° C.

The cutting position (position of the cutting trace 22) is not particularly limited as long as it is one place in the width direction WD of the portion to be the non-stretchable region A1, and as shown in FIGS. 9 and 10, the width direction of the non-stretchable region A1. It may be one end of WD, it may be the center of the widthwise WD of the non-stretchable region A1 as in the examples shown in FIGS. 11 and 12, or it may be at a position other than these. May be good. The cutting position determines the length and arrangement of the independent contraction portion 19.

The width of the cut convex portion 72 (the size of the WD in the width direction of the cut trace 22) can be appropriately determined, but is about 0.5 to 8% or 0.5 to 5 mm of the size of the WD in the width direction of the non-stretchable region A1. It is preferable to set the degree.

The cutting pattern (cutting trace 22) is not particularly limited and may be an intermittent pattern in the anteroposterior LD as shown in FIG. 10, but is the most waist-side as shown in FIGS. 9, 11 and 12. It is preferable that the linear pattern is continuous in the front-rear direction LD from the cutting position of the elastic members 15 to 17 to the cutting position of the elastic members 15 to 17 on the crotch side. Such a linear pattern may be a linear pattern as shown in the illustrated example, or may be a curved or wavy pattern (not shown).

The reinforcing joint portion 23 is a portion that becomes the non-stretchable region A1 and is sandwiched from the inside of the inner sheet layer 12H and the outside of the outer sheet layer 12S to be pressurized and heated to weld the inner sheet layer 12H and the outer sheet layer 12S. Can be formed by For example, as shown in FIGS. 13 and 14 (a) to 14 (c), a welded convex portion for forming a reinforcing joint portion 23 on a seal roll 70 having a cut convex portion 72 of elastic members 15 to 17 Forming 73 is preferable because the elastic members 15 to 17 can be cut and the reinforcing joint portion 23 can be formed with a single seal roll 70, which simplifies the manufacturing equipment. Of course, when the appropriate heating temperature for cutting the elastic members 15 to 17 and the appropriate heating temperature for forming the reinforcing joint 23 are different, as required, as shown in FIG. 14 (c). The first seal roll 70 having the cutting convex portion 72 of the elastic members 15 to 17 and the second seal roll 75 having the welding convex portion 73 for forming the reinforcing joint portion 23 are arranged side by side in the MD direction. You can also do it. Even if the reinforcing joint portion 23 is formed after cutting the elastic members 15 to 17 as shown in FIGS. 13 and 14 (a), the elastic joint portion 23 is elastic as shown in FIGS. 14 (b) and 14 (d). It may be performed before cutting the members 15 to 17, or may be performed at the same time as cutting the elastic members 15 to 17, as shown in FIG. 14 (c).

When the reinforcing joint portion 23 is formed before or at the same time as cutting the elastic members 15 to 17, the elastic members 15 to 17 may be pressurized and heated. Therefore, for example, as in the example shown in FIG. 11, after cutting the elastic members 15 to 17 at the intermediate portion (cutting trace 22) of the portion to be the non-stretchable region A1 in the width direction WD, the elastic members 15 to 17 are located on both sides of the width direction WD. It is preferable to form the reinforcing joint portion 23 in the width direction WD range that does not have the independent contraction portion 19, such as forming the reinforcing joint portion 23 at a position between the independent contraction portions 19.

When cutting the elastic members 15 to 17 and forming the reinforcing joint 23 at the same time, if they are performed at the same time only in the central portion of the width direction WD of the non-stretchable region A1, the cutting is performed as shown in FIG. The trace 22 and the reinforcing joint portion 23 are provided only in the central portion of the widthwise WD of the non-stretchable region A1, and the lengths of the independently contracted portions 19 on both sides of the widthwise WD are equal. Therefore, the appearance including the reinforcing joint portion 23 is symmetrical with respect to the center of the WD in the width direction, which is preferable in that the appearance is excellent.

When the reinforcing joint portion 23 is formed before cutting the elastic members 15 to 17, as shown in FIG. 9, a dotted line or a line is formed along the width direction WD between the independent contraction portions 19 adjacent to the front-rear direction LD. It is preferable to form the reinforcing joint portion 23 in a shape because when the independently contracting portion 19 contracts after cutting, the independently contracting portion 19 is unlikely to have an irregular shape.

(Post-processing tape)
As shown in FIGS. 2 and 8, a post-treatment tape 90 is provided on the outer surface of the non-stretchable region A1 of the posterior exterior body 12B. That is, as shown in FIGS. 15 and 16, the post-treatment tape 90 has a strip-shaped root portion 91 extending in the front-rear direction LD fixed to the outer surface of the outer sheet layer 12S of the exterior body 12 with an adhesive 94 or the like. It has a band-shaped main body portions 92, 93 extending from the waist side of the root portion 91, and an adhesive 94 provided on the main body portions 92, 93. When disposing of the diaper, the diaper is rolled or folded so that the top sheet 30 is on the inside and the front body F is on the inside, and then the main bodies 92 and 93 of the post-treatment tape 90 are peeled off, and then the main body 92, As shown in FIG. 17, the 93 is wound from the back body B of the rolled or folded diaper 100 to the outer surface on the opposite side beyond the waist opening WO, and fixed to the outer surface of the exterior body 12 with the adhesive 94. As a result, as shown in FIG. 17, the diaper can be fixed in a rolled or folded state.

The main bodies 92 and 93 of the post-treatment tape 90 have a first portion 92 extending from the waist opening WO side of the root portion 91 to the crotch side and a second portion 93 folded back toward the waist opening WO side at the tip of the first portion 92. The adhesive 94 is provided on the surface of the first portion 92 facing the root portion 91 and the surface of the second portion 93 facing the first portion 92, respectively, and the first portion 92. Is adhered to the root portion 91 by the adhesive 94 and the second portion 93 is adhered to the first portion 92 by the adhesive 94, so that the first portion 92 and the second portion 93 are fixed in the folded state. It is preferable to have it. In this case, the root portion 91 and the main body portions 92 and 93 are formed by connecting a plurality of sheets S1 to S4 as shown in the illustrated example, or may be formed by a single sheet (not shown). When the root portion 91 is formed by connecting a plurality of sheets, the number of sheets is not particularly limited, and in the illustrated example, the root portion 91 is composed of four sheets, but may be composed of less or more sheets. be able to. When performing the post-treatment, the tips of the main bodies 92 and 93 are picked and pulled in a direction away from the exterior body 12 or toward the waist opening WO, so that the first portion 92 and the second portion 93 are shown in FIG. Peel off in order and unfold. When the main bodies 92 and 93 are tilted toward the waist opening WO side at the same time as or after unfolding, the adhesive of the second portion 93 faces the exterior body 12.

Explaining the illustrated example in more detail, the post-treatment tape 90 includes a first sheet S1 in which an adhesive 94 is applied to the surface on the exterior body 12 side and fixed to the outer surface of the exterior body 12 by the adhesive 94. The second sheet S2 connected to the outwardly folded tip of the first sheet S1 and the third sheet S3 fixed to the outwardly folded tip of the second sheet S2 are folded in three (cross section). Along with forming a Z-shaped structure, the second sheet S2 is detachably adhered to the first sheet S1 by the adhesive 94 applied to the surface on the first sheet S1 side, and the third sheet S3 is the second sheet. It is peelably adhered to the second sheet S2 by the adhesive 94 applied to the surface on the S2 side. The surface of each sheet S1 to S3 opposite to the adhesive 94 side can be peeled off by applying a peeling process such as a release agent, and the portion where the adhesive 94 between the sheets S1 to S3 is adhered to each other. The adhesive portion to the exterior body 12 is connected so as not to peel off. Further, a colored tape S4 colored in an opaque color such as white is connected to the tip of the third sheet S3 with an adhesive 94, and a picked portion with good visibility (in the illustrated example, the tip of a single sheet is formed. (Colored in an opaque color different from other parts) is formed.

The dimensions of the post-treatment tape 90 are not particularly limited, but considering the ease of picking, the stability when the diaper is fixed in a rolled state, the wearing feeling, etc., the main body parts 92, 93 and the attachment The width direction WD dimension 91W of the root portion 91 is about 11 to 15 mm, the front-back LD dimension 91L of the root portion 91 is about 0.1 to 0.2 times the total length Y of the diaper, and the main body portions 92 and 93 are in the deployed state. The size 90L of the front-rear LD is preferably about 1.4 to 1.7 times the size 91L of the front-rear LD of the root portion 91.

As the material of the root portion 91 and the main body portions 92 and 93, for example, an olefin resin such as polyethylene or polypropylene, or a synthetic resin sheet such as polyvinyl chloride or PET can be preferably used, but is particularly limited. is not.

The pressure-sensitive adhesive 94 is not particularly limited, and synthetic rubber-based pressure-sensitive adhesives, natural rubber-based pressure-sensitive adhesives, acrylic resin-based pressure-sensitive adhesives, silicone resin-based pressure-sensitive adhesives, and the like can be used.

Other known post-treatment tapes 90 may be used as long as they have a root portion 91 and main body portions 92 and 93. Further, the mounting position of the post-treatment tape 90 is not particularly limited as long as it is the outer surface of the exterior body 12, and can be provided at an appropriate position. Although the post-treatment tape 90 is generally provided on the back body B as shown in the illustrated example, it may be provided on the front body F, or may be provided on both the back body B and the front body F.

Generally, since the root portion of the post-treatment tape 90 is fixed to the non-stretchable region A1, the force of the rolled diaper to spread acts to peel off the root portion and the adhesive portion after the application. Therefore, if the outer sheet layer 12S and the inner sheet layer 12H in the non-stretchable region A1 are weakly or not joined, the force for the rolled diaper to spread is locally applied only to the outer sheet layer 12S, and the outer sheet layer There is a risk that the 12S will stretch or tear. Therefore, from such a viewpoint, it is preferable to provide the above-mentioned reinforcing joint portion 23.

<Explanation of terms in the specification>
The following terms in the specification have the following meanings unless otherwise specified in the specification.

-The "front-back direction" means the direction indicated by the symbol LD in the figure (vertical direction), and the "width direction" means the direction indicated by the WD in the figure (horizontal direction), and the front-back direction and the width direction. Are orthogonal.

-The "MD direction" and "CD direction" mean the flow direction (MD direction) in the manufacturing equipment and the lateral direction (CD direction) orthogonal to this, and one of them is the front-rear direction depending on the part of the product. And the other is in the width direction. The MD direction of the non-woven fabric is the direction of fiber orientation of the non-woven fabric. The fiber orientation is the direction along which the fibers of the non-woven fabric follow. For example, the measurement method according to the fiber orientation test method based on the zero-distance tensile strength of the TAPPI standard method T481 or the fibers based on the tensile strength ratio in the front-rear direction and the width direction. It can be discriminated by a simple measuring method for determining the orientation direction.

・ "Front side" means the person closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the person farther from the wearer's skin when wearing a pants-type disposable diaper. ..

・ "Front side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper, and "back side" means the side of the member that is closer to the wearer's skin when wearing a pants-type disposable diaper. It means the far side.

-"Elongation rate" means a value when the natural length is 100%. For example, an elongation rate of 200% is synonymous with an elongation ratio of 2 times.

-"Gel strength" is measured as follows. Artificial urine (urea: 2 wt%, sodium chloride: 0.8 wt%, calcium chloride dihydrate: 0.03 wt%, magnesium sulfate heptahydrate: 0.08 wt%, and ion-exchanged water: 97.09 wt% Add 1.0 g of highly absorbent polymer to 49.0 g (mixed product) and stir with a stirrer. The produced gel is left in a constant temperature and humidity chamber at 40 ° C. × 60% RH for 3 hours, then returned to room temperature, and the gel strength is measured with a card meter (Curdmeter-MAX ME-500 manufactured by I. techno Engineering).

-"Grandming" is measured as follows. After pre-drying the sample or test piece, leave it in a test room or device under standard conditions (test location: temperature 23 ± 1 ° C., relative humidity 50 ± 2%) to bring it to a constant weight. Pre-drying refers to constant weight of a sample or test piece in an environment at a temperature of 100 ° C. It is not necessary to pre-dry the fibers having an official moisture content of 0.0%. A sample having a size of 100 mm × 100 mm is cut out from the test piece in a constant weight state using a sampling template (100 mm × 100 mm). The weight of the sample is measured and multiplied by 100 to calculate the weight per square meter, which is used as the index.

-The "thickness" is automatically measured using an automatic thickness measuring device (KES-G5 handy compression measurement program) under the conditions of a load of 0.098 N / cm ² and a pressurized area of 2 cm ² . The thickness of the perforated non-woven fabric is measured at a portion other than the holes and the protruding portion around them.

-The water absorption amount is measured by JIS K7223-1996 "Water absorption amount test method for highly water-absorbent resin".

-The water absorption rate shall be the "time to the end point" when JIS K7224-1996 "Water absorption rate test method for superabsorbent polymer" was performed using 2 g of superabsorbent polymer and 50 g of physiological saline. ..

-"Unfolded state" means a state in which the unfolded state is flat without shrinkage or slack.

-Unless otherwise specified, the dimensions of each part mean the dimensions in the unfolded state, not in the natural length state.

-If there is no description about the environmental conditions in the test or measurement, the test or measurement shall be performed in a test room or equipment under standard conditions (test location: temperature 23 ± 1 ° C, relative humidity 50 ± 2%). To do.

The present invention can be used for pants-type disposable diapers such as those described above.

A1 ... non-stretchable area, A2 ... stretchable area, H1 ... hot melt adhesive, L ... intermediate area, LD ... front-back direction, LO ... leg opening, T ... waist circumference area, U ... waist lower part, W ... waist part , WD ... width direction, WO ... waist opening, 11 ... liquid permeable sheet, 12 ... exterior body, 12A ... side seal part, 12B ... rear exterior body, 12F ... front exterior body, 12H ... inner sheet layer, 12S ... outer sheet layer, 12r ... inner surface layer, 14 ... buttocks cover, 15-17 ... elastic members, 18 ... waist elastic members, 19 ... independent shrinkage, 22 ... cutting traces, 23 ... reinforcing joints, 30 ... top Sheet, 40 ... Intermediate sheet, 50 ... Absorbent element, 56 ... Absorber, 58 ... Packaging sheet, 60 ... Rise gather, 62 ... Gather sheet, 90 ... Post-treatment tape, 200 ... Interior body, 201 ... Inner / outer fixing part.

Claims (8)

An integrated exterior body from the front body to the back body, or an exterior body separately provided on the front body and the back body,
An interior body including an absorber attached to the exterior body so as to extend from the front body to the back body,
Side seals where both sides of the exterior body on the front body and both sides of the exterior body on the back body are joined, respectively.
With a waist opening and a pair of left and right leg openings
The exterior body has a non-stretchable region provided in the middle in the width direction and a stretchable region provided on both sides of the non-stretchable region in the front-rear direction range having the absorber.
The stretchable region includes an inner sheet layer, an outer sheet layer, and a plurality of elongated elastic members along the width direction attached to the inner sheet layer and the outer sheet layer at intervals in the front-rear direction. It is a region that elastically expands and contracts in the width direction together with the elastic member.
In the stretchable region, the inner sheet layer and the outer sheet layer are joined by a hot melt adhesive arranged at least at the position of the elastic member, and the elastic member is fixed to the inner sheet layer and the outer sheet layer. Has been
The non-stretchable region has an inner sheet layer and an outer sheet layer continuous from the stretchable region, and an independent contraction portion left between the inner sheet layer and the outer sheet layer and continuous from the elastic member of the stretchable region. , The independently contracted portion is a region contracted without the inner sheet layer and the outer sheet layer.
In the non-stretchable region, the inner sheet layer and the outer sheet layer are not joined and the independent shrinkage portion is not fixed to the inner sheet layer and the outer sheet layer, or the independent shrinkage portion is arranged at the position of the independent shrinkage portion. The inner sheet layer and the outer sheet layer are joined weaker than the expansion / contraction region by only the hot melt adhesive, and the independent shrinkage portion is an elastic member of the expansion / contraction region to the inner sheet layer and the outer sheet layer. Weakly fixed,
In pants-type disposable diapers;
The non-stretchable region has a reinforcing joint in which the inner sheet layer and the outer sheet layer are directly welded at at least one place including a central portion in both the width direction and the front-rear direction.
Pants-type disposable diapers that feature this. The reinforcing joint is provided in a dotted line or a linear shape along the width direction between the independently contracted portions adjacent to each other in the front-rear direction.
The pants-type disposable diaper according to claim 1. The reinforcing joint portion is provided only in the central portion in the width direction of the non-stretchable region, and the lengths of the independently contracted portions on both sides in the width direction are equal.
The pants-type disposable diaper according to claim 1 or 2. The reinforcing joint portion is provided in a display form composed of a pattern, a picture, a character, or a combination thereof.
The pants-type disposable diaper according to claim 1. The method for manufacturing a pants-type disposable diaper according to claim 1.
When forming the exterior body, the elastic member is arranged in an extended state between the inner sheet layer and the outer sheet layer so as to pass through the portion that becomes the stretchable region and the portion that becomes the non-stretchable region.
In the portion to be the elastic region, the inner sheet layer and the outer sheet layer are joined by at least a hot melt adhesive applied to the peripheral surface of the elastic member, and the elastic member is attached to the inner sheet layer and the outer sheet layer. Fixed,
In the non-stretchable region, the inner sheet layer and the outer sheet layer are not joined and the independently contracted portion is not fixed to the inner sheet layer and the outer sheet layer, or the peripheral surface of the elastic member is not fixed. The inner sheet layer and the outer sheet layer are joined weaker than the portion to be the stretchable region by only the hot melt adhesive applied to the inner sheet layer and the outer sheet layer, and the elastic member is attached to the inner sheet layer and the outer sheet layer with the stretchable region. Fix it weaker than the part
After that, the elastic member is cut and heated by sandwiching it from the inside of the inner sheet layer and the outside of the outer sheet layer at one place in the width direction of the non-stretchable region, and cutting the elastic member.
Before or after cutting the elastic member, or at the same time as cutting the elastic member, pressurize and heat by sandwiching the non-stretchable region from the inside of the inner sheet layer and the outside of the outer sheet layer. The inner sheet layer and the outer sheet layer are welded together to form the reinforcing joint portion.
A method of manufacturing pants-type disposable diapers that is characterized by this. After cutting the elastic member, the reinforcing joint is formed in a width direction range that does not have the independent contraction portion.
The method for manufacturing a pants-type disposable diaper according to claim 5. Cutting the elastic member and forming the reinforcing joint portion are simultaneously performed only at the central portion in the width direction of the non-stretchable region.
The method for manufacturing a pants-type disposable diaper according to claim 5. Prior to cutting the elastic member, the reinforcing joint is formed in a dotted line or a linear shape along the width direction between the independently contracted portions adjacent in the front-rear direction.
The method for manufacturing a pants-type disposable diaper according to claim 5.

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