JP6436708B2 - Absorbent articles - Google Patents

Description

  The present invention relates to absorbent articles such as sanitary napkins, panty liners, incontinence pads, disposable paper diapers for absorbing menstrual blood, vaginal discharge, urine, and the like, and more specifically, a liquid-permeable surface sheet is provided with an uneven pattern. The present invention relates to an absorbent article.

  Conventionally, as a surface material of an absorbent article, an appropriate embossing pattern has been given according to various purposes such as reducing the contact area with the skin to suppress the moist feeling, or giving the texture and enhancing the touch. Things are offered to the market. As this kind of thing, the following patent documents 1 and 2 etc. can be mentioned, for example.

  In the following Patent Document 1, there are a large number of large convex portions and small convex portions of a three-dimensional dome structure of two types surrounded by thermal bonding embossing on the skin contact surface side of the upper layer. Each of the small convex portions is formed in a polygonal shape surrounded by a plurality of adjacent thermal bonding embosses, and the bottom area of the large convex portion is twice or more the bottom area of the small convex portion, A top sheet for absorbent articles is disclosed in which the height at the top of the large convex portion is higher than the height at the top of the small convex portion.

  Moreover, in the following Patent Document 2, the surface sheet has a linear emboss extending in one direction while meandering in a wavy or zigzag shape, and a convex portion surrounded by the linear emboss is continuous in the one direction. And the convex portion forms a mountain structure in which large convex portions having a large area and height and small convex portions having a relatively small area and height are alternately present in the one direction. The mountain structure is intermittently arranged in a direction orthogonal to the one direction, and a surface for an absorbent article in which a ridge extending continuously in the one direction is formed between adjacent mountain structures. A sheet is disclosed.

Japanese Patent No. 5421676 JP 2010-158488 A

  However, in the surface sheet described in Patent Document 1, the convex portion surrounded by the emboss has a three-dimensional dome structure, and the slope of the convex portion is formed almost equally in any direction. It is not certain in which direction this body fluid will flow. For this reason, when this body fluid flows in the direction in which the emboss is provided, the body fluid can quickly transfer from the emboss to the absorber, but in the case where the body fluid flows in a direction other than the direction in which the emboss is provided, the absorber There was a possibility that the body feeling would deteriorate due to the slow transition of the body fluid to the body and the body fluid remaining on the top sheet, resulting in a sticky feeling. In addition, when the convex portion has a three-dimensional dome structure formed with a gentle inclination angle substantially equal in any direction, the body fluid accumulated at the top of the convex portion slows down the transition to the surrounding embossing. Depending on the situation, the body fluid may remain on the top of the convex portion, resulting in a sticky feeling.

  On the other hand, in the surface sheet described in Patent Document 2, linear embossing that is continuous in the longitudinal direction of the absorbent article is imparted, so that the skin is in linear contact with the skin, making it easy to feel the hardness due to the embossing, and the texture. The feeling was getting worse.

  Then, the main subject of this invention is providing the absorbent article which improved the feeling of smoothness while making it easy to transfer a bodily fluid to an absorber, maintaining the good touch.

In order to solve the above problems, as the present invention according to claim 1, in an absorbent article in which an absorber is interposed between a liquid-permeable top sheet and a back sheet,
The liquid-permeable surface sheet is intermittently subjected to a large number of first embosses and second embosses, and the area of the first embosses is 2 to 4 times the area of the second embosses, and The first emboss and the second emboss are formed with the same width,
A first defined area in which the first emboss and the second emboss are arranged in a predetermined pattern is provided in a lattice shape along the longitudinal direction and the width direction of the absorbent article, and four corners are formed in the adjacent first defined area. The second defined area is provided so as to include the second embossment disposed in each of the first defined areas, in a portion surrounded by
A first convex portion that bulges to the skin side with the first embossing and the second embossing as base ends is formed in the first defining region, and at least the second embossing is formed in the second defining region. And a second convex part bulging toward the skin at a relatively lower height than the first convex part is formed,
In the first defining region, the first emboss is arranged so that the center is positioned on the imaginary line to be closed, and the second emboss is in the middle of the adjacent first embosses along the imaginary line. And the absorbent article characterized by being arrange | positioned so that a center may be located inside the said virtual line is provided.

  According to the first aspect of the present invention, the liquid-permeable topsheet is intermittently subjected to a large number of first embosses and second embosses, whereby the first protrusions and the It is an absorptive article provided with the uneven permeable surface sheet in which many 2 convex parts were formed. More specifically, first, the liquid-permeable topsheet is provided with a first defined area in which the first emboss and the second emboss are arranged in a predetermined pattern in a grid pattern, and the first first adjacent to each other. A second defined area is provided in a portion surrounded by the four corners of the defined area so as to include a second emboss disposed in each of the first defined areas. And the 1st convex part which bulges to the skin side is formed in the 1st definition field on the basis of the 1st embossing and the 2nd embossing. The second defining region has a second convex portion that bulges toward the skin at a relatively lower height than the first convex portion, with at least the second embossing as a base end. As described above, the second convex portion bulging relatively low on the skin side is formed in the region surrounded by the four corners of the first convex portion bulging relatively high on the skin side. The two convex portions and the periphery thereof are temporary body fluid storage spaces surrounded on the four sides by the first convex portions. This body fluid storage space becomes a larger space than the case where the first convex portion and the second convex portion are configured at the same height, and a large amount of body fluid can be temporarily stored. The sensation can be improved and the body fluid can be quickly transferred from the second convex portion and its periphery to the absorber.

  At this time, in the first defining region, the first emboss is arranged so that the center is located on the imaginary line to be closed. On the other hand, the second emboss is arranged between the first embosses adjacent to each other along the imaginary line and the center thereof is located inside the imaginary line. As described above, the first convex portion having the first emboss and the second emboss as the base ends is located on the inner side of the imaginary line passing through the center of the first emboss. The slope of the first convex portion in the emboss formation region is steeper than the slope of the first convex portion in the adjacent region, and the slope of the adjacent region bulges outward, whereas the slope of the second emboss Since the second emboss is arranged so as to bite inward on the slope in the formation region, it bulges inward. For this reason, when there is a body fluid at the top of the first convex portion, this body fluid is likely to flow toward the slope (flow-promoting slope) on which the second emboss is steeply sloped. It is easy to flow into the aforementioned body fluid storage space. Therefore, it is difficult for the body fluid to remain on the skin surface, and the sensation can be improved.

  In addition, since the first embossing and the second embossing are provided intermittently, the influence of the hardness due to the embossing is small, and the good texture can be maintained.

  As the present invention according to claim 2, there is provided the absorbent article according to claim 1, wherein the virtual line is an ellipse that is long in the longitudinal direction of the absorbent article.

  In the second aspect of the present invention, the imaginary line is formed in an elliptical shape that is long in the longitudinal direction of the absorbent article, so that the first convex portion with the elliptical imaginary line as a base end is an elliptical short shape. Since the gradient in the hand direction (the width direction of the absorbent article) is relatively steeper than the gradient in the longitudinal direction of the ellipse (the longitudinal direction of the absorbent article), the body fluid present at the top of the convex portion is relatively It becomes easy to flow along the short side direction of the steep elliptical shape, and the body fluid quickly flows into the body fluid storage space on the short side direction of the elliptical shape.

  As the present invention according to claim 3, there is provided an absorbent article according to any one of claims 1 and 2, wherein the first emboss is formed with a relatively larger area than the second emboss.

  In the third aspect of the invention, since the first emboss is formed with a relatively larger area than the second emboss, the boundary between the adjacent first protrusions becomes clear, and the first emboss is absorbed from the first emboss. It makes it easier for body fluids to migrate to the body.

  The absorbent article according to any one of claims 1 to 3, wherein the first emboss is a long oval along the tangential direction of the imaginary line, and the second emboss is a circle. Is provided.

  In the invention according to claim 4, since the first emboss is formed in a long oval shape along the tangential direction of the imaginary line, the first convex portion having the first emboss as a base end is formed precisely. Since the second embossing is formed in a circular shape, the steeply sloped surface bulging inwardly formed on the first convex portion by the second embossing becomes roundness of the second embossing. It will be able to form exactly along.

  As this invention which concerns on Claim 5, in the said 1st definition area | region, the said 1st embossing is each arrange | positioned at the width direction both sides and the longitudinal direction both ends of the absorbent article. The absorbent article described is provided.

  In the fifth aspect of the present invention, the specific arrangement position of the first emboss whose center is located on the elliptical imaginary line is defined. The first embossing is disposed at each of four locations on both sides in the width direction and both ends in the longitudinal direction of the absorbent article with respect to the elliptical virtual line. That is, it arrange | positions at each top part of the longitudinal direction of a elliptical virtual line, and a transversal direction, respectively. Accordingly, the first protrusion is clearly formed because the four sides are surrounded by the first emboss.

  As described above in detail, according to the present invention, body fluid can be easily transferred to an absorbent body while maintaining a good texture, and the feeling can be further improved.

3 is an enlarged plan view of a liquid permeable top sheet 3. FIG. It is the II-II arrow directional view of FIG. It is the III-III line arrow directional view of FIG. 1 which shows the state at the time of body fluid discharge | emission. It is sectional drawing of the conventional absorbent article which shows the state at the time of body fluid discharge | emission. FIG. 3 is an enlarged plan view of a first definition region 12. It is the VI-VI line arrow directional view of FIG. It is the VII-VII line arrow directional view of FIG. 2 is a cross-sectional view showing a part of the manufacturing process of the sanitary napkin 1. FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings.

  As shown in FIGS. 1 and 2, the sanitary napkin 1 according to the present invention has a liquid-impervious back sheet 2 made of a polyethylene sheet, a polypropylene sheet, or the like, and a permeate that quickly permeates menstrual blood or a cage. A liquid surface sheet 3, an absorbent body 4 made of cotton-like pulp or synthetic pulp interposed between the two sheets 2 and 3, and the liquid-permeable surface sheet 3 and the absorbent body 4 were provided. A hydrophilic second sheet 5 is provided. In addition, you may provide the crepe paper (not shown) which surrounds the said absorber 4 in order to maintain the shape of the said absorber 4 and a diffusivity improvement.

Hereinafter, the structure of the sanitary napkin 1 will be described in detail.
As the liquid-impermeable back sheet 2, a sheet material having at least water shielding properties such as an olefin resin sheet such as polyethylene or polypropylene is used. In addition, a laminated nonwoven fabric obtained by laminating a nonwoven fabric on a polyethylene sheet or the like, or A nonwoven fabric sheet (in this case, the waterproof film and the nonwoven fabric constitute a liquid-impervious back sheet) can be used after substantially impervious to liquid imperviousness by interposing a waterproof film. In recent years, those having moisture permeability tend to be used from the viewpoint of preventing stuffiness. This water- and moisture-permeable sheet material is a microporous sheet obtained by forming a sheet by melting and kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene, and then stretching in a uniaxial or biaxial direction. It is.

  Next, as the liquid-permeable surface sheet 3, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. Examples of the material fibers constituting the nonwoven fabric include synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester and polyamide, recycled fibers such as rayon and cupra, and natural fibers such as cotton. A nonwoven fabric obtained by an appropriate processing method such as a lace method, a spun bond method, a thermal bond method, a melt blown method, or a needle punch method can be used. Among these processing methods, the spunlace method is excellent in terms of flexibility and the spunbond method is excellent in drapeability, and the thermal bond method and the air-through method are excellent in terms of being bulky and having high compression recovery properties.

  The absorbent body 4 interposed between the liquid-impermeable back sheet 2 and the liquid-permeable surface sheet 3 is made of, for example, cotton-like pulp and a highly water-absorbing polymer. As the superabsorbent polymer, superabsorbent polymer granular powder (SAP) or superabsorbent polymer fiber (SAF) can be used. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolving pulp, and artificial cellulose fibers such as rayon and acetate. It is preferably used in terms of price. Although the manufacturing method of the absorber 4 is preferably made of piled pulp so as to be rich in flexibility, it may be an airlaid absorber capable of reducing the bulk.

  The absorbent body 4 may be mixed with synthetic fibers. As the synthetic fiber, for example, polyolefins such as polyethylene or polypropylene, polyesters such as polyethylene terephthalate and polybutylene terephthalate, polyamides such as nylon, and copolymers thereof can be used. It may be a mixture. In addition, a composite fiber such as a core-sheath fiber, a side-by-side fiber, or a split fiber having a fiber having a high melting point as a core and a fiber having a low melting point as a sheath can also be used.

  The hydrophilic second sheet 5 disposed between the liquid-permeable surface sheet 3 and the absorbent body 4 may be anything as long as it has hydrophilicity with respect to the body fluid. Specifically, by using recycled fibers such as rayon and cupra, natural fibers such as cotton, the material itself has hydrophilicity, or synthesis of olefins such as polyethylene or polypropylene, polyesters, polyamides, etc. The fiber which surface-treated with the hydrophilizing agent and provided the hydrophilic property can be used. As will be described later, the second sheet 5 is bonded to the back surface side of the liquid-permeable surface sheet 3 by heat fusion (embossing), and the embossing 10 and the liquid-permeable surface sheet 3 together with the both sheets being laminated. 11 processing is performed.

  The second sheet 5 and the absorbent body 4 are desirably joined by a hot melt adhesive or the like. By joining the second sheet 5 and the absorbent body 4, menstrual blood or the like can quickly penetrate into the absorbent body 4 from the second sheet 5 and be absorbed.

  In the sanitary napkin 1, as shown in FIG. 1, the liquid-permeable surface sheet 3 and the second sheet 5 are intermittently embossed from the skin surface side (surface side) of the liquid-permeable surface sheet 3. A number of first embosses 10 and second embosses 11 are provided. The intermittent application of the first emboss 10 and the second emboss 11 means that the embossed portions by the embosses 10 and 11 and the spaced portions to which no embossing is applied are alternately formed, and the napkin width direction or longitudinal direction This means that no continuous emboss line is applied.

  The liquid-permeable surface sheet 3 and the second sheet 5 are joined by the first emboss 10 and the second emboss 11. As the first embossing 10 and the second embossing 11, known embossing means such as thermal embossing and ultrasonic embossing can be adopted.

  As shown in FIG. 1, the liquid-permeable surface sheet 3 includes a first defined region 12 in which the first emboss 10 and the second emboss 11 are arranged in a predetermined pattern, and the longitudinal direction and width of the sanitary napkin 1. At least the second emboss 11 provided in the first defining region 12 is provided in a lattice shape along the direction, and at the four corners surrounded by the adjacent first defining regions 12, 12. The second defining region 16 is provided so as to include In the example shown in FIG. 1, the second defining area 16 is formed with an embossing pattern in which the second embossing 11 arranged in the surrounding first defining area 12 is arranged at four corners one by one. . The second defined area 16 includes at least the second emboss 11 disposed in the first defined area 12. Therefore, the second defined area 16 is provided so as to partially overlap the first defined area 12.

  As shown in FIG. 1, the first defining area 12 may be partitioned so that adjacent first defining areas 12, 12 have some embossing (first embossing 10) in common. However, the first defining regions 12 and 12 may be arranged so as to be separated from each other (so as not to have the first emboss 10 common to the adjacent first defining regions 12 and 12).

  The first defined region 12 is formed with a relatively larger area than the second defined region 16. Further, the number of the embosses 10 and 11 provided in the first definition region 12 is relatively larger than the number of the embosses provided in the second definition region 16.

  The first defining region 12 is formed with a first convex portion 14 bulging toward the skin with the first emboss 10 and the second emboss 11 as the base ends. The second defining region 16 is formed with a second convex portion 15 that bulges toward the skin at a relatively lower height than the first convex portion 14 with at least the second emboss 11 as a base end. Has been.

  As shown in FIG. 2 and FIG. 3, the first convex portion 14 and the second convex portion 15 are formed by causing the liquid-permeable surface sheet 3 to bulge from the second sheet 5 to the skin side, A space is provided between the liquid-permeable surface sheet 3 and the second sheet 5. The volume of the space is formed so that the first protrusion 14 is relatively larger than the second protrusion 15, and the height of the space is the second protrusion 15 of the first protrusion 14. It is formed relatively larger.

  As shown in FIG. 3, the height H <b> 2 bulging toward the skin side of the second convex portion 15 (from the non-skin surface of the second sheet 5 at the top of the second convex portion 15 to the skin surface of the liquid-permeable surface sheet 3. Is the height H1 bulging to the skin side of the first convex portion 14 (from the non-skin surface of the second sheet 5 at the top of the first convex portion 14 to the skin surface of the liquid-permeable surface sheet 3). It is set relatively lower than (height) (H1> H2). The height H1 of the first convex portion 14 is preferably 2.1 mm to 4.0 mm, and the height H2 of the second convex portion 15 is preferably 1.0 mm to 2.0 mm. The difference (H1−H2) between the height H1 of the first protrusion 14 and the height H2 of the second protrusion 15 is preferably 0.5 mm to 3.0 mm.

  Since the first projecting portion 14 and the second projecting portion 15 are provided, the contact area between the liquid-permeable surface sheet 3 and the skin surface is reduced. That is, since the contact point between the liquid-permeable surface sheet 3 and the skin surface becomes the top of the first convex portion 14 that bulges relatively high toward the skin side, it contacts the skin surface in a plurality of points. The contact area is reduced and the skin contact is improved. Moreover, since the contact with the skin surface becomes a plurality of points, and there is a space between the skin surface and other than the contact portion, the fluidity of the body fluid is improved through this space, and the body fluid is easily transferred to the absorber.

  Further, when the second convex portion 15 bulges to the skin side at a relatively lower height than the first convex portion 14, the following effects are exhibited. As shown in FIG. 1 and FIG. 3, a temporary body fluid storage space S surrounded by the first protrusions 14, 14... Will be formed. Even when a large amount of bodily fluid that cannot be held in the space between the first convex portion 14 and the second convex portion 15 is discharged, the body fluid storage space S has a stored water level from the height H2 of the second convex portion 15. The body fluid can be held by expanding to the height H1 of the first convex portion 14 that has been raised. Here, even when the stored water level rises from the height H <b> 2 of the second convex portion 15, the liquid-permeable surface sheet 3 is in contact with the skin surface at the top of the first convex portion 14, and therefore accumulates in the body fluid storage space S. The body fluids are less likely to adhere to the skin surface, so that you can maintain a dry feeling. In addition, the body fluid temporarily stored in the body fluid storage space S is quickly transferred from the surfaces of the embosses 10 and 11, the first protrusions 14, and the second protrusions 15 to the absorber 4.

  On the other hand, if there is no distinction between the first convex portion 14 and the second convex portion 15 and the convex portions having the same height are formed as shown in FIG. Only a gap could be used as a body fluid storage space, and when a large amount of body fluid was discharged, the body fluid stored water level increased and the body fluid contacted the skin surface, causing stickiness.

The emboss pattern provided in the first defining region 12 and the cross-sectional shape of the first convex portion 14 will be described in detail with reference to FIGS. First, the embossing pattern will be described. As shown in FIG. 5, in the first defining region 12, the first embossing 10 is positioned so that the center C _{10 of} the first embossing 10 is positioned on the imaginary line 13 to be closed. Has been placed. In other words, the first embossing 10 is, when subtracting the imaginary line 13 passing through the plurality of first embossing 10, 10 ... center _{C 10} of the present in the first defined area 12, the virtual line 13 is oval, It is formed by a closed shape line such as a circle or a polygon.

The virtual line 13 is preferably formed in an elliptical shape that is long in the longitudinal direction of the sanitary napkin 1. That is, it is preferable that the first embosses 10, 10... In the first defining region 12 are intermittently arranged so that the centers C ₁₀ , C ₁₀ . In this way, when the first embosses 10, 10... Are arranged along the elliptical imaginary line 13, the first convex portion 14 with the first embosses 10, 10. The gradient of the outer contour of the first convex portion 14 in the elliptical short direction (napkin width direction) is the outer contour of the first convex portion 14 in the elliptical longitudinal direction (napkin longitudinal direction). Since the slope is relatively steeper than the slope of the line, the bodily fluid existing at the top of the first convex portion 14 is likely to flow in an elliptical short direction (napkin width direction) having a steep slope. The body fluid easily flows into the body fluid storage space S formed in the hand direction.

As shown in FIG. 5, the planar dimension of the imaginary line 13 is preferably such that the longitudinal dimension L ₁₃ is 4.0 mm to 10.0 mm and the lateral dimension W ₁₃ is 3.5 mm to 7.5 mm.

The first emboss 10 is intermittently disposed along the virtual line 13. The number of the first embosses 10 arranged along the imaginary line 13 may be at least 3, preferably 4 to 8, and more preferably 4 shown in FIG. When the four first embosses 10, 10... Are arranged on the elliptical virtual line 13, each of the elliptical quadrant, that is, each of the virtual line 13 and the elliptical longitudinal centerline CL and the widthwise centerline CW. preferably, the center C ₁₀ is arranged so as to be positioned at the intersection. As a result, the region surrounded by the first embosses 10, 10... Bulges more clearly to the skin side, and the first convex portion 14 can be formed exactly.

  The first emboss 10 is preferably formed with a relatively larger area than the second emboss 11. Specifically, the area of the first emboss 10 is 2 to 4 times, preferably about 3 times the area of the second emboss 11. Thereby, while the 1st embossing 10, 10 ... will be formed more clearly, the 1st convex part 14 which bulges to the skin side will be mentioned later provided by providing the said 2nd embossing 11, 11 .... The slope of the flow-promoting slope 17 becomes clearer, and body fluid easily flows along the flow-promoting slope 17. The area of the first emboss 10 and the second emboss 11 is the area of the bottom surface of each emboss 10, 11. The first emboss 10 and the second emboss 11 may be formed with the same area, or the second emboss 11 may be formed with a larger area than the first emboss 10.

  As shown in FIG. 5, the planar shape of the first emboss 10 is preferably an oval shape whose both side edges are straight lines and whose both end edges are semicircular arcs. The oval first emboss 10 is preferably oriented in the longitudinal direction in the tangential direction of the virtual line 13. As a result, the region surrounded by the first embosses 10, 10... Bulges more clearly to the skin side, and the first convex portion 14 can be formed exactly. Further, the planar shape of the first emboss 10 may be formed in various forms such as a circle, an ellipse, a quadrangle, and a polygon in addition to an oval.

When the plane dimension of the first emboss 10 (dimension of the bottom face of the emboss) is a plane shape long in the tangential direction of the imaginary line 13 as shown in FIG. 5, the longitudinal dimension L ₁₀ is 1.0 mm to 5.0 mm, preferably, the shorter dimension _{W 10} and 0.5 mm to 3.0 mm.

On the other hand, as shown in FIG. 5, the second emboss 11 is an intermediate point between the adjacent first embosses 10 and 10 along the virtual line 13, and the center C ₁₁ of the second emboss ₁₁ is the virtual line. It is arranged so as to be located inside 13. That is, the center C ₁₁ of the second emboss 11 is arranged so as to have an eccentric amount U in the radial direction inside the virtual line 13.

The eccentric amount of time of the center C ₁₁ is positioned from the virtual line 13 on the inner side of the second embossing 11 U (radial distance between the imaginary line 13 between the center C ₁₁ and the virtual line 13 of the second embossing 11) The imaginary line 13 may be in a range that passes through the emboss of the second emboss 11. That is, when the second emboss 11 is circular, the eccentric amount U is preferably within the radius of the second emboss 11. If it is decentered inward from this, the bulging height of the first convex portion 14 is lowered by the second emboss 11, and the flow of body fluid due to the inclination of the first convex portion 14 may be hindered.

  As for the said 2nd embossing 11, it is preferable that a planar shape is circular as FIG. 5 shows. By making the 2nd emboss 11 circular, the circular arc part which bulges to the center side of the virtual line 13 opposes the curved surface which bulges outside the 1st convex part 14, and the below-mentioned flow by the 2nd emboss 11 The slope of the accelerating slope 17 can be formed exactly. The planar shape of the second emboss 11 can be formed in various forms such as an oval, an ellipse, a quadrangle, and a polygon in addition to a circle. When the second emboss 11 is formed in a planar shape having a longitudinal direction and a short direction, it is preferably arranged so that the longitudinal direction is parallel to the tangential direction of the adjacent virtual line 13.

The planar dimension (dimension of the bottom face of the emboss) of the second emboss 11 is 0.5 mm to 3.0 mm when circular (longitudinal dimension L ₁₁ = short dimension W ₁₁ ) as shown in FIG. Is preferred. Further, when formed in a planar shape having a longitudinal direction and a lateral direction, the longitudinal dimension _{L 11} 0.5 mm to 4.0 mm, a short side dimension _{W 11} is given to the 0.5mm~3.0mm preferred.

The width (diameter in the case of a circle) of the second emboss 11 is preferably formed to be substantially the same as the width (short dimension in the case of an oval) of the first emboss 10. Thereby, while the 1st convex part 14 and the below-mentioned flow-promoting slope 17 are formed reliably, the influence of the hardness by embossing can be relieved. That is, by forming the first emboss 10 and the second emboss 11 with substantially the same width, the center C ₁₁ of the second emboss 11 is positioned inward from the virtual line 13 passing through the center C ₁₀ of the first emboss 10. Since the inner edge of the second emboss 11 bites into the first convex portion 14 that bulges to the skin side with the inner edge of the first emboss 10 as the base end, a flow-promoting slope 17 described later is provided. Can be reliably formed.

  One or a plurality of the second embosses 11 may be arranged between the first embosses 10 and 10 adjacent to each other along the virtual line 13. In the example shown in FIG. 5, one second emboss 11 is arranged in the center between the adjacent first embosses 10 and 10. That is, with respect to the elliptical imaginary line 13, the first emboss 10 is disposed at each apex in the longitudinal direction and the short direction, and the second emboss 11 is disposed at an intermediate portion thereof. For this reason, as shown in FIG. 1, in the state where the first defined regions 12 are arranged in a grid pattern in the vertical and horizontal directions, the first defined regions 12 adjacent to each other are surrounded by the four corners. , Four second embosses 11, 11... Are located. In addition, when arrange | positioning two or more 2nd embossing 11 ... between the 1st embossing 10 and 10, it is good to arrange | position at substantially equal intervals.

  Next, the cross-sectional shape of the first convex portion 14 formed in the first definition region 12 will be described. The cross-sectional shape of the first protrusion 14 is based on the first embosses 10 and 10 as shown in FIG. 6 in a cross-section passing through the center of the first embosses 10 and 10 facing each other (cross-section in the napkin width direction). It is formed in a dome-like outer shape that bulges outward with the imaginary line 13 as the bottom.

On the other hand, in the cross section (diagonal cross section) passing through the opposing second embosses 11, 11, the center C ₁₁ of the second emboss 11 is positioned inside the virtual line 13 as shown in FIG. 7. The second emboss 11 is applied inside the dome-shaped outer shape formed by the first emboss 10. For this reason, in this cross-sectional view, in the vicinity region of the second emboss 11, the external shape of the first convex portion 14 is swelled inward, and the cross-sectional view passing through the first embosses 10 and 10 The flow-promoting slope 17 is formed with a relatively steep slope from the outer shape line. As shown in FIG. 5, the flow-promoting slope 17 is formed so as to extend from the second emboss 11 to the center of the first convex portion 14 over a predetermined range.

  In this way, by providing the flow-promoting slope 17 on the first convex portion 14, when there is a body fluid on the top of the first convex portion 14, the body fluid is steeply inclined by applying the second emboss 11. It becomes easy to flow toward the flow-promoting slope 17 and becomes easy to flow into the body fluid storage space S to which the second emboss 11 is applied. Therefore, liquid does not remain on the surface of the liquid-permeable surface sheet 3, and body fluid does not easily adhere to the skin surface, so that the smoothness of the surface can be improved.

  Moreover, since the 1st emboss 10 and the 2nd emboss 11 are each provided intermittently, there is little influence of the hardness by emboss and it becomes possible to maintain the good texture.

  On the other hand, in the second defining area 16, as shown in FIG. 1, the second embossing 11, The 2nd convex part 15 is formed when the liquid-permeable surface sheet 3 of the area | region enclosed by 11 ... bulges to the skin side.

  In the example shown in FIG. 1, the second defined area 16 is provided so as to include one second emboss 11 arranged in each of the first defined areas 12 arranged in the surrounding four directions. Thus, a total of four second embosses 11, 11... Are arranged. The second definition area 16 may include two or more second embosses 11 disposed in each first definition area 12 or may include the first emboss 10.

In the second defining region 16, the four second embosses 11, 11,... Are arranged so that the center is located on the second imaginary line 18 to be closed. The second imaginary line 18 is preferably oval long in the napkin longitudinal direction, but may be circular, polygonal, or oval long in the napkin width direction. As shown in FIG. 1, the planar dimension of the second imaginary line 18 is preferably such that the longitudinal dimension L ₁₈ is 2.0 mm to 4.0 mm and the short dimension W ₁₈ is 2.0 mm to 3.5 mm. .

  As shown in FIG. 3, the cross-sectional shape of the second convex portion 15 is formed in a dome shape whose outer shape bulges outward in any cross-sectional view.

  As described above, since the second convex portion 15 formed in the second defining region 16 is provided in the body fluid storage space S, the second emboss 11 serving as the base end of the second convex portion 15 is The body fluid storage space S is formed. For this reason, the bodily fluid accumulated in the bodily fluid storage space S is easily absorbed by the absorber 4 through the second emboss 11.

  In the first defined region 12, the ratio of the first emboss 10 and the second emboss 11 overlapping the virtual line 13 is preferably 30% to 80% with respect to the length of the virtual line 13, and 65%. -75% is more preferred. Further, when a circular or elliptical second imaginary line 18 passing through the center of the second embossing 11, 11... Is drawn in the second defining region 16, the second embossing 11 is placed on the second imaginary line 18. Is preferably 30% to 80%, and more preferably 35% to 45% with respect to the length of the second virtual line 18. By adding embossing, the fibers of the absorbent body become dense and the body fluid easily moves to the absorbent body. However, if the embossing ratio on the imaginary lines 13 and 18 is smaller than 30%, the body fluid is on the side of the absorbent body 4. On the other hand, when this ratio is larger than 80%, it becomes easy to feel the hardness due to embossing.

  In order to manufacture the laminated structure of the liquid-permeable surface sheet 3 and the second sheet 5, a manufacturing apparatus 20 shown in FIG. 8 is used.

The manufacturing apparatus 20 has a number of convex portions corresponding to the first convex portions 14, a number of convex portions corresponding to the second convex portions 15, and a number corresponding to the first emboss 10 on the surface. The first embossing roll 21 is disposed opposite to the first embossing roll 21, and the first embossing roll 21 is disposed on the surface of the first embossing roll 21. A second embossing roll 22 in which a large number of concave portions corresponding to the convex portions of the first embossing roll 21 and a large number of convex portions corresponding to the concave portions of the first embossing roll 21 are disposed; a flat roll 23 having a flat surface; The convex portion of the first embossing roll 21 and the second embossing roll by passing the liquid-permeable surface sheet 3 between the first embossing roll 21 and the second embossing roll 22. The first convex portion 14 and the second convex portion 15 are processed by meshing with the two concave portions, and then the liquid-permeable surface sheet 3 travels on the surface of the second embossing roll 22 and is liquid-permeable. While the embossed portion of the top sheet 3 is held in the concave and convex portions of the second embossing roll 22, it is laminated with the separately fed second sheet 5, and the liquid-permeable top sheet 3 and the second sheet 5 are laminated. The first embossing 10 and the second embossing 11 are processed by the convex portions of the second embossing roll 22 by passing between the second embossing roll 22 and the flat roll 23 in a laminated state. The liquid surface sheet 3 and the second sheet 5 are bonded by thermal fusion.
[Other examples]
In the above embodiment, the imaginary line 13 has an elliptical shape that is long in the napkin longitudinal direction, but it may be circular or polygonal, or may be formed in a shape that is long in the napkin width direction.

  In order to evaluate the performance of the sanitary napkin 1, the sanitary napkin 1 and the conventional sanitary napkin, which differ only in the embossing pattern of the liquid-permeable surface sheet, were produced, and the respective performance tests were performed. The measurement was performed for each of the five sanitary napkins of the example and the comparative example, and the average value was evaluated five times. The method and results are shown below.

The specifications of the sanitary napkins according to Examples and Comparative Examples used in the tests are as shown in Table 1, respectively. In the sanitary napkin 1 according to the embodiment, four oval first embosses 10 and second circular embosses 11 are alternately arranged in the first defining region 12 along the elliptic virtual line 13. The second embossing area 16 is provided with four second embossing elements 11. The longitudinal dimension _{L 13} of the virtual line 13 is 7.0 mm, the short dimension _{W 13} and 5.5 mm, the longitudinal dimension _{L 18} of the second imaginary line 18 is 3.6 mm, the short dimension _{W 18} 2.8mm It was. The planar dimensions of the first embossing 10, the longitudinal dimension _{L 10} is 2.8 mm, the short dimension _{W 10} is 1.0 mm. The planar dimension of the second emboss 11 is 1.0 mm in diameter. The eccentric amount U of the second emboss 11 with respect to the virtual line 13 is 0.3 mm. Further, the height H1 of the first convex portion 14 formed in the first defining region 12 is 3.2 mm, and the height H2 of the second convex portion 15 formed in the second defining region 16 is 1. 5 mm.

  On the other hand, the sanitary napkin according to the comparative example has a liquid-permeable surface sheet, and alternately has protrusions 50 on one side in the width direction of the napkin and protrusions 51 on the other side along the napkin longitudinal direction. The first wavy pattern 52 to be repeated and the emboss of the wavy pattern in which the second wavy pattern 53 obtained by inverting the first wavy pattern 52 in the napkin width direction are alternately arranged in the napkin width direction are provided. The separation width between the first wavy pattern 52 and the second wavy pattern 53 is such that a wide portion and a narrow portion are alternately repeated in the longitudinal direction of the napkin, and a dot-like emboss 54 is provided in the wide portion. I used the thing. In the sanitary napkin according to this comparative example, the liquid-permeable topsheet is skinned in the region sandwiched between the protruding portions 50, 50 on one side of the first wavy pattern 52 and the second wavy pattern 53 on both sides. A convex portion that bulges to the side is provided. The convex portion has a three-dimensional dome structure that bulges to the skin side in a substantially circular shape in plan view with the protruding portions 50, 50 on one side of the first wavy pattern 52 and the second wavy pattern 53 as the base ends. None, the top is recessed by the embossing 54. The maximum separation width between the first wavy pattern 52 and the second wavy pattern 53 in the wide portion is 5.9 mm.

  The test method is as follows. In the touch test, when 10 subjects traced the outer surface side of the liquid-permeable surface sheet of the sanitary napkin according to Examples and Comparative Examples by hand, the touch was evaluated as good (◯) or bad (×). . In addition, all the subjects evaluated good ((circle)) in the Example and the comparative example.

  In the absorption speed test, when 1 cc of artificial menstrual blood at 37 ° C. is injected into the surface of the liquid-permeable surface sheet with a beaker, it takes from the start of the injection to when it is visually determined that the artificial menstrual blood on the surface has been absorbed. Time was measured with a stopwatch, which was performed twice at 3 minute intervals and evaluated each time.

試験の結果、本生理用ナプキン１では、比較例と比較して、１回目及び２回目の両方とも吸収スピードが速いという結果が得られた。本生理用ナプキン１では、上述の通り、第２エンボス１１を施すことによって、第１凸部１４の斜面が、前記第２エンボス１１の形成領域において隣接する領域の斜面より急勾配となった流下促進斜面１７となるため、第１凸部１４の頂部に存在する人工経血が素早く吸収されるようになる。これに対して、比較例に係る生理用ナプキンでは、第１の波状パターン５２と第２の波状パターン５３の幅広部に形成された凸部が丸い立体ドーム状に形成されるため、人工経血がドーム状の斜面を流れるスピードが遅くなっていると考えられる。 In the reversal amount test, 1 cc of artificial menstrual blood at 37 ° C. is injected, and after 3 minutes interval, 1 cc of artificial menstrual blood at 37 ° C. is injected again at the same location. The amount of change in the weight of the filter paper when a 5 g / cm ² weight was placed thereon for 5 minutes was measured as the amount of reversal. The artificial menstrual blood used was a component of 100 ml of glycene, 4.6 g of CMC (Carboxymethylcellulose sodium), 875 ml of purified water, 10 g of sodium chloride, and 10.7 g of sodium carbonate.

As a result of the test, the sanitary napkin 1 showed that the absorption speed was faster in both the first time and the second time than in the comparative example. In the sanitary napkin 1, as described above, by applying the second emboss 11, the slope of the first convex portion 14 flows down more steeply than the slope of the adjacent region in the formation region of the second emboss 11. Since it becomes the promotion slope 17, the artificial menstrual blood which exists in the top part of the 1st convex part 14 comes to be absorbed rapidly. On the other hand, in the sanitary napkin according to the comparative example, the convex portions formed in the wide portions of the first wavy pattern 52 and the second wavy pattern 53 are formed in a round three-dimensional dome shape. It seems that the speed of flowing through the dome-shaped slope is slow.

  Further, in the sanitary napkin 1, artificial menstrual blood flows along the flow-promoting slope 17 and is quickly absorbed on the absorber side, so that there is little liquid remaining on the liquid-permeable surface sheet and the amount of reversion is also small. On the other hand, in the sanitary napkin according to the comparative example, since the convex portion bulging to the skin side is formed in a round three-dimensional dome shape, artificial menstrual blood hardly flows through the liquid-permeable surface sheet, and the liquid-permeable surface sheet It is considered that the amount of reversion increases due to the body fluid remaining on the surface returning to the surface.

  DESCRIPTION OF SYMBOLS 1 ... Sanitary napkin, 2 ... Liquid-impermeable back sheet, 3 ... Liquid-permeable surface sheet, 4 ... Absorber, 5 ... Second sheet, 10 ... 1st emboss, 11 ... 2nd emboss, 12 ... 1st image Formation region, 13 ... virtual line, 14 ... first convex portion, 15 ... second convex portion, 16 ... second defined region, 17 ... flow-down acceleration slope, 18 ... second virtual line, 20 ... manufacturing device, 21 ... 1st embossing roll, 22 ... 2nd embossing roll, 23 ... Flat roll

Claims (5)

In the absorbent article in which an absorbent body is interposed between the liquid-permeable top sheet and the back sheet,
The liquid-permeable surface sheet is intermittently subjected to a large number of first embosses and second embosses, and the area of the first embosses is 2 to 4 times the area of the second embosses, and The first emboss and the second emboss are formed with the same width,
A first defined area in which the first emboss and the second emboss are arranged in a predetermined pattern is provided in a lattice shape along the longitudinal direction and the width direction of the absorbent article, and four corners are formed in the adjacent first defined area. The second defined area is provided so as to include the second embossment disposed in each of the first defined areas, in a portion surrounded by
A first convex portion that bulges to the skin side with the first embossing and the second embossing as base ends is formed in the first defining region, and at least the second embossing is formed in the second defining region. And a second convex part that bulges to the skin side at a relatively lower height than the first convex part is formed,
In the first defining region, the first emboss is arranged so that the center is positioned on the imaginary line to be closed, and the second emboss is in the middle of the adjacent first embosses along the imaginary line. An absorptive article, wherein the absorbent article is arranged so that the center is located inside the imaginary line.   The absorbent article according to claim 1, wherein the imaginary line has an elliptical shape that is long in a longitudinal direction of the absorbent article.   The absorbent article according to claim 1, wherein the first emboss is formed with a relatively larger area than the second emboss.   The absorbent article according to any one of claims 1 to 3, wherein the first emboss is an oval that is long along a tangential direction of the virtual line, and the second emboss is a circle.   The absorptive article according to any one of claims 1 to 4 in which said 1st embossing is arranged in a width direction both sides and a longitudinal direction both ends of an absorptive article in said 1st definition field, respectively.

Images