CN1986210A - Non-woven fabric - Google Patents
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- CN1986210A CN1986210A CNA200610168984XA CN200610168984A CN1986210A CN 1986210 A CN1986210 A CN 1986210A CN A200610168984X A CNA200610168984X A CN A200610168984XA CN 200610168984 A CN200610168984 A CN 200610168984A CN 1986210 A CN1986210 A CN 1986210A
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Abstract
Non-woven fabric (10) has a first layer (11) including a surface, and a second layer (12) which includes another surface and contains a fibre after thermally contracting. Two layers are adhered locally through a plurality of junction portion. At the side of the first layer (11), a recessed part (14) is formed in the junction portion (13) and a protruding part (15) between the recessed parts (14). The first layer (11) side is provided with recessed and protruding figure. A core shifted complex fiber with core sheath type is employed as the constitute fibre of the first layer (11).
Description
Technical field
The present invention relates to nonwoven.The present invention relates in addition the absorbent commodity of this nonwoven as face sheet.
Background technology
The applicant has proposed a kind of three-dimensional sheeting (with reference to CN1348026A) before this, its have ground floor and with the second layer of this ground floor adjacency, the ground floor and the second layer engage partly by the junction surface of predetermined pattern, ground floor forms three-dimensional shape between this junction surface, the second layer is made of the material of the body behavior that demonstrates flexibility, and the sheet material general performance goes out elastomeric behavior and has gas permeability.This solid sheeting has a large amount of jogs on its surface.This solid sheeting is enough high with its recovery and compression when thickness direction compresses when in-plane stretches.In order to improve recovery and the morphotropism to compress of this solid sheeting, in the second layer of this sheeting, contain the potential crimping property fiber of rolled state to stretching.The shape in the vertical section of this solid sheeting as shown in Figure 6.That is it is spherical that, the protuberance P among the three-dimensional sheeting S forms semicircle.Be full of fiber in the protuberance P, this fiber along the profile of protuberance P towards transverse direction roughly.
The technology of relevant potential crimping property fiber, the known fiber (with reference to JP2003-3334A) that has used polypropylene terephthalate's resin.This fiber be core by polypropylene terephthalate's resin constitute, sheath portion by polyolefin resin constitute, the position of centre of gravity of core departs from the composite fibre of the center of fiber, be to have wavy and/or helical form is curled, dry-hot shrinkage is the crimpiness fiber below 3%.Use the nonwoven of this fiber manufacturing to have good compression flexibility, initial stage bulkiness, initial stage and long-term volume recovery.
Summary of the invention
The object of the present invention is to provide a kind ofly to have soft hand feeling more, and have the nonwoven of better liquid permeability than above-mentioned nonwoven in the past.
The invention provides a kind of nonwoven, its have the ground floor that comprises a face and comprise another face and contain thermal contraction after the second layer of fiber, above-mentioned two-layerly engage partly by a large amount of junction surfaces;
In the ground floor side, be formed with recess and the protuberance between this recess in the position at described junction surface, described ground floor side has concaveconvex shape;
Wherein, as the formation fiber of ground floor, use the core-sheath-type composite fibre of core shift.
In addition, the present invention also provides a kind of absorbent commodity, and as face sheet, wherein, this nonwoven disposes according to the mode that its ground floor side contacts with skin with above-mentioned nonwoven for it.
Description of drawings
Fig. 1 (a) is the stereogram of an embodiment of expression nonwoven of the present invention, and Fig. 1 (b) is the profilograph of protuberance.
Fig. 2 (a) and (b) be the schematic diagram of representing the cross-section structure of the core shift core-sheath-type composite fibre that uses among the present invention respectively.
Fig. 3 is the interfibrous image of extracting out the back is handled in expression to the view data in the vertical section of the protuberance of nonwoven figure.
Fig. 4 is the microphotograph image of the profile of the nonwoven that obtains among the embodiment 1.
Fig. 5 is the microphotograph image of the profile of the nonwoven that obtains in the comparative example 1.
Fig. 6 is a profilograph of representing the structure of nonwoven in the past.
The specific embodiment
According to embodiment preferred, the present invention will be described with reference to accompanying drawing below.At Fig. 1 (a) with express the stereogram of an embodiment of nonwoven of the present invention and the profile of thickness direction (b).The nonwoven 10 of the present embodiment is the nonwoven with the ground floor 11 that comprises a face and 2 layers of structure of the second layer 12 that comprises another face.Ground floor 11 is made of the aggregate of fiber.On the other hand, the second layer 12 is made of the aggregate with fiber variety classes that constitutes ground floor 11 and/or the fiber that mixes.Ground floor 11 and the second layer 12 is stacked mutually and engage partly by a large amount of junction surfaces 13.The ground floor 11 and the second layer 12 are not to engage with their whole face conversely speaking.
When overlooking, the junction surface of the ground floor 11 and the second layer 12 13 is rounded and become point-like with the pattern arrangement of the shape that is staggered.Junction surface 13 is compacted as shown like that by the effect of heat and/or pressure, thereby compares with other position of nonwoven 10, and it is big that less thick and density become.
In nonwoven 10, recess 14 is positioned at the position at junction surface 13.Mainly constitute protuberance 15 that fiber constitutes between recess 14 by ground floor 11.In ground floor 11 sides, formed concaveconvex shape thus by a large amount of protuberance 15 and a large amount of recesses 14.
On the other hand, in the second layer 12 sides, keeping tabular surface roughly between the junction surface 13.Therefore on the whole, formed its second layer 12 sides and had the structure of a large amount of jogs for roughly tabular surface and ground floor 11 sides as nonwoven 10.
In ground floor 11, it constitutes between fiber by heat fusing is bonding and has an abutment.Because it is bonding to have produced heat fusing between the formation fiber, thereby the surface of ground floor 11 is not easy to take place the balling-up of fiber.Fiber is not easy the advantage that balling-up brings, when with nonwoven 10 as for example with material that skin contact the time, seldom to skin generation physical stimulation.
Protuberance 15 has formed the state that enriches that its inside is full of fiber.The fiber that is full of in the protuberance 15 mainly is the formation fiber of ground floor 11.Because it is bonding to have produced heat fusing between the formation fiber of ground floor 11 as mentioned above, be full of therefore that also to have produced heat fusing between the fiber of protuberance 15 bonding.
The invention is characterized in,, use the core-sheath-type composite fibre (being called the core shift composite fibre) of core shift as the formation fiber of ground floor 11.At Fig. 2 (a) with expressed the cross-section structure of core shift composite fibre (b).The core shift composite fibre is made of the core composition and the sheath composition that are made of thermoplastic resin respectively.The core composition has constituted the core C of fiber.On the other hand, the sheath composition has constituted the S of sheath portion of fiber.The position of centre of gravity of core C and the S of sheath portion staggers, and promptly forms the core shift state.
Shown in Fig. 2 (a), core C is wrapped in the inside in fact by the S of sheath portion.Therefore the core composition that constitutes core C is not exposed to the surface of fiber.But, the surface that the core composition of formation core C is not exposed to fiber is not necessary among the present invention, as long as core C and the S of sheath portion have formed core sheath structure in fact, for example also can be shown in Fig. 2 (b) like that, a part of core composition is exposed to the surface of fiber.
The core shift composite fibre is owing to the position of centre of gravity of core C and the S of sheath portion staggers, so be lax crooked state under nature.To be in the raw fibre of the core shift composite fibre of this state as ground floor 11, when making nonwoven 10 according to manufacture method described later, accident distinguishes, in protuberance 15, the great majority in the core shift composite fibre are as shown in Figure 1 towards the roughly thickness direction of this protuberance 15.In protuberance 15, owing to the core shift composite fibre exists with above-mentioned state, so the nonwoven 10 of the present embodiment has good liquid permeability.Specifically, liquid flows down along the core shift composite fibre towards the roughly thickness direction of protuberance 15 easily, thereby the permeability of liquid improves.Its result, liquid is not easy to remain in the nonwoven 10.
Contrast with it, when the fiber in being full of protuberance 15 is not the core shift composite fibre, for example be under the situation of concentric core-sheath-type composite fibre, just as before in background technology, describing as shown in Figure 6, fiber along the profile of the spherical protuberance of semicircle towards transverse direction roughly.
So-called " great majority in the core shift composite fibre are towards the roughly thickness direction of protuberance " is meant, when microscopic examination is used in the vertical section that cuts out protuberance 15, in the fiber that exists in field of view, be benchmark with the radical, the fiber more than 50% is with respect to the above angle of horizontal direction inclination 50 degree.Concrete assay method is as described below.The view data (size 254KB film forms JPG) of the microphotograph in the vertical section of protuberance 15 is put into the IMAGEPROPLUS that the プ ラ ネ ト ロ of Co., Ltd. Application/MEDIA CYBERNETICS company as image analysis one instrumentation software makes.Show the view data of putting into, " counting/size " of the mensuration project on the designated software extracted 0.05～1.0cm out
2Big interfibrous image (except the appointment of size, at random extracting out) by software.An example of the interfibrous image of extracting out as shown in Figure 3.Individually taking out the image of extracting out, is the angle that benchmark is measured each limit with the level.With this viewpoint definition is the angle of fiber.
By using the formation fiber of core shift composite fibre as ground floor 11, the additional effect that can also play is that nonwoven 10 presents soft hand feeling.It the reasons are as follows described.Just as described above, in ground floor 11, engage by heat fusing is bonding as its core shift composite fibre that constitutes fiber.Yet as previously described, this core shift composite fibre is lax crooked state under nature.Therefore in protuberance 15, the quantity at the abutment between the fiber tails off.And in the core shift composite fibre, because thin-walled portion is more in as the sheath portion that makes composition melt bonded between the fiber, so even formed the abutment, the joint at this abutment also dies down.Consequently, the core shift composite fibre that is full of the inside of protuberance 15 becomes easy state because of the external force activity, so nonwoven 10 presents soft hand feeling.
In addition, having known has a kind of like this fiber in the core-sheath-type composite fibre of core shift, and promptly because the difference of the percent thermal shrinkage of core composition and sheath composition is bigger, so these compositions produce contraction because of applying heat, show spiral helicine curling.Such fiber is commonly referred to as latent crimp fiber.But, in the employed in the present invention core shift composite fibre, do not comprise the core shift core-sheath-type composite fibre that shows the curling state of helical form.Even be that the core shift composite fibre that uses among the present invention is applied in heat and also can show spiral helicine curling, in ground floor 11, be lax crooked state.
Owing to use the formation fiber of core shift composite fibre, so protuberance 15 presents the special shape different with the protuberance P of the nonwoven in the past shown in Fig. 6 as ground floor 11.Particularly, shown in Fig. 1 (b), in the protuberance 15 in the nonwoven 10 of the present embodiment, its vertical section forms the shape of roughly trapezoidal or essentially rectangular, has the wall portion 16 that erects towards top roughly and links to each other with this wall portion 16 and the upper surface part 17 of general planar.Because protuberance 15 has formed aforesaid shape, therefore this protuberance 15 can be revolted the compression that comes from its thickness direction and is not easy to be pressed to collapse, even nonwoven 10 is being applied under the situation of compression stress, also can stably keep the concaveconvex shape of its ground floor 11 sides.
As mentioned above, ground floor 11 contains the core shift composite fibre.At this moment, ground floor 11 can only be made of the core shift composite fibre, also can also contain other fiber except containing the core shift composite fibre.As other fiber, can list the fiber that for example constitutes by thermoplastic, polymeric materials such as polyester such as polyolefin such as polyethylene and polypropylene, PETG, polyamide.Also can use the core-sheath-type composite fibre or the parallel composite fiber that constitute in addition by above-mentioned thermoplastic, polymeric materials.Also have, can list hygroscopicity fibres such as artificial silk, cotton, hydrophily acrylic fiber etc.When ground floor 11 contained other fiber, the amount of other fiber was preferably 5～50 weight % of the weight of ground floor, is preferably 10～30 weight % especially.
In the core shift composite fibre that ground floor 11 is contained, the fusing point of the formation resin of the S of sheath portion is lower than the fusing point of the formation resin of core C.The kind of core shift composite fibre is not particularly limited.Thickness to fiber also is not particularly limited, and selects the core shift composite fibre of suitable thickness according to the concrete purposes of nonwoven 10.For example when nonwoven 10 is used as the face sheet of absorbent commodity, preferably using thickness is core shift composite fibre about 1～30dtex.
The particularly preferred combination of the formation resin of the formation resin of the core C in the core shift composite fibre and the S of sheath portion is, use polyester resin as the formation resin of core C, use the combination of polyolefin resin as the formation resin of the S of sheath portion.Because polyester resin is the higher material of elasticity, so used as the core C of core shift composite fibre, and when making nonwoven 10 according to method described later, in protuberance 15, the great majority in the core shift composite fibre are roughly towards the thickness direction of this protuberance 15.In addition, protuberance 15 resistances come from the compression of its thickness direction and are not easy to be pressed to collapse.Particularly as mylar, preferably use PTT (below be also referred to as PTT) resinoid, PETG resinoid, polybutylene terephthalate (PBT) resinoid.Wherein, especially preferably using the highest resin of elasticity is the PTT resinoid.
As the PTT resinoid, can list mixture of for example homopolymerization PTT resinoid, copolymerization PTT resinoid or these resins and other polyester resin etc.As the resinoid copolymer composition of copolymerization PTT,, can use M-phthalic acid, butanedioic acid, adipic acid etc. as sour composition.In addition,, can use 1,4-butanediol, 1,6-hexylene glycol, polytetramethylene glycol, polyoxymethylene glycol (polyoxymethyleneglycol) etc. as pure composition.The consumption of copolymer composition is preferably below the 10 weight % with respect to the resinoid weight of PTT.In addition, other polyester resin as above-mentioned can use for example PETG and polybutylene terephthalate (PBT) etc.The consumption of this other polyester resin is preferably below the 50 weight % with respect to the weight of above-mentioned mixture.
As with the polyolefin resin of the formation sheath S of portion of PTT resinoid that constitutes core C and usefulness, can list the copolymer resins of for example acrylic resin, high-density polyethylene resin, medium density polyethylene resin, ldpe resin, straight chain shape ldpe resin, polymethylpentene resin, poly-1-butylene resin and above-mentioned resin etc.In addition, also can use unsaturated carboxylic acids such as the polymerizable monomer that will constitute above-mentioned resin and acrylic acid, methacrylic acid, maleic acid and their ester, acid anhydrides to carry out copolymerization and resin of obtaining etc.In addition, can also use the mixture of above-mentioned various polyolefin resin and other resin.As other resin, can use for example polyester resin and polystyrene resins etc.The consumption of this other resin is preferably below the 30 weight % with respect to the weight of above-mentioned mixture.
In addition, according to above-mentioned patent documentation 2, use the formation resin of PTT (PTT) resinoid, use polyolefin resin to curl as the core shift core-sheath-type composite fibre of the formation resin of the S of sheath the portion wavy curling and/or helical form appropriate owing to the heat that is applied in set point of temperature shows as core C.But, consider the permeability of the flexibility of protuberance 15 and bulkiness, liquid, the described core shift composite fibre that uses in the present embodiment does not comprise and shows the fiber that helical form is curled as mentioned above.
Contain the fiber after the thermal contraction in the second layer 12 of the nonwoven 10 of the present embodiment.Fiber after the so-called thermal contraction is meant that the heat-shrinkable fiber becomes the state of contraction owing to the heat that is applied in set point of temperature.Also comprise curling in shrinking in addition.As the fiber after the thermal contraction that contains in the second layer 12, preferably owing to the heat that is applied in set point of temperature shows curling fiber (below be called crimped fibre).This is because in the second layer 12 when containing crimped fibre, can give the retractility of nonwoven 10 on its in-plane.From this viewpoint, as crimped fibre, the preferred use is the fiber that the three-dimensional spiral shape curls.Preferred especially the use is the potential crimping property fiber that the three-dimensional spiral shape curls.The potential crimping property fiber for example is made of the core shift core-sheath-type composite fibre or the parallel composite fiber that are composition with two kinds of different thermoplastic, polymeric materials of shrinkage factor.As its example, can list the fiber of putting down in writing among JP9-296325A and the JP2759331B.As the example of two kinds of different thermoplastic, polymeric materials of shrinkage factor, can list the combination of ethylene-propylene random copolymer (EP) and polypropylene (PP).The potential crimping property fiber is preferably about 1～7dtex in the fiber number that shows before curling.
The second layer 12 can be made of the fiber after 100% thermal contraction, also can contain other fiber.As other fiber, for example can list in contraction and begin under the temperature fiber of not thermal contraction in fact as the heat-shrinkable fiber of the raw material of the second layer 12.Has heat-shrinkable although specifically can list, the fiber that begins under the temperature fiber of not thermal contraction in fact and do not have heat-shrinkable in fact in the contraction of above-mentioned heat-shrinkable fiber.During fiber beyond the fiber after containing thermal contraction in the second layer 12, the amount of the fiber after the thermal contraction is preferably more than the 50 weight % with respect to the weight of the second layer 12, is preferably 70～90 weight % especially.
The mass area ratio of the nonwoven 10 of the present embodiment depends on the concrete purposes of nonwoven 10, and for example when nonwoven 10 was used as the face sheet of absorbent commodity, mass area ratio was preferably 20～200g/m
2, be preferably 50～100g/m especially
2At this moment, the mass area ratio of ground floor 11 is preferably 10～100g/m
2, be preferably 25～50g/m especially
2The mass area ratio of the second layer 12 is preferably 10～100g/m
2, be preferably 25～50g/m especially
2In addition, when with nonwoven 10 during as the face sheet of for example absorbent commodity, its thickness is preferably 1.0～5.0mm, is preferably 1.5～3.0mm especially.At this moment, the thickness of ground floor 11 is preferably 0.5～3.0mm, is preferably 1.0～2.0mm especially, and the thickness of the second layer 12 is preferably 0.5～2.0mm, is preferably 0.5～2.0mm especially.
The thickness of nonwoven 10 is measured with following method.At first, nonwoven 10 is cut into the size of 50mm * 50mm, with it as measuring sheet.Measuring on the platform, placing size and measure the plate of the big 10g of sheet than this.The datum mark A of set positions with the upper surface of the plate under this state for measuring.Then, take away plate, measure sheet measuring to place on the platform, and placing plate more thereon.With the set positions of the upper surface of the plate under this state is B.Obtain the thickness of nonwoven 10 by the difference of A and B.Measuring instrument uses laser displacement measurement instrument (the CCD laser displacement sensor LK-080 that KEYENCE Co., Ltd. produces), also can use the thickness gauge of dial indicator formula.But, under the situation of used thickness instrument, should be with the weight of the detection power of measuring instrument and plate at 0.4cN/cm
2Pressure under regulate.
The thickness of the ground floor 11 and the second layer 12 is measured with following method.At first, downcutting length and width from nonwoven 10 is the test film of 30mm * 30mm.Then, use operating direction (flow direction) almost parallel when making the fiber assembly that ground floor uses and make cutting plane by the line at junction surface 3.Obtain the enlarged photograph of this section with high-power microscope (KEYENCE Co., Ltd. produce VH-8000) etc.Obtain the maximum ga(u)ge of ground floor 11 according to the magnification ratio of enlarged photograph, with it as the first fibrolaminar thickness (t1), at the thickness of the maximum ga(u)ge determination part position-finding second layer 12 of ground floor 11, with it as the second fibrolaminar thickness (t2).That is, on the same straight line that the thickness direction along three-dimensional nonwoven extends, measure the thickness of the ground floor 11 and the second layer 12.In addition, the thickness at junction surface (t3) is also similarly measured height from the upper surface at junction surface to lower surface with t1, t2.Also have, also can measure the thickness of nonwoven 10 with this assay method.
The following method of nonwoven 10 preferred employings of the present embodiment is made.Make first fiber assembly and second fiber assembly that constitutes the ground floor 11 and the second layer 12 at first, respectively.As this fiber assembly, can use for example fleece or nonwoven.Nonwoven adopts for example manufacturings such as hot blast method, hot-rolling method (heat embossing method), air lay method, meltblown.Fleece utilizes for example carding machine manufacturing.Particularly as first fiber assembly, melt bonded nonwoven is a hot blast method nonwoven by blowing of hot blast between the preferred use formation fiber, as second fiber assembly, preferably uses fleece.Contain above-mentioned core shift composite fibre in first fiber assembly.Although it is the orientation of this core shift composite fibre also depends on the manufacture method of fiber assembly, general roughly towards the in-plane orientation of fiber assembly.In addition, contain the heat-shrinkable fiber that is in the preceding state of thermal contraction in second fiber assembly.In addition, when first fiber assembly that is contained when the core shift composite fibre is hot blast method nonwoven, this core shift composite fibre is owing to be the state of core shift, so compare with concentric composite fibre, the abutment quantity of the bonding core shift composite fibre that produces of heat fusing is few, and the bond strength at this abutment is low.
Then, overlapping first fiber assembly on second fiber assembly engages their patterns according to the rules partly.As long as the method that both are engaged can form the junction surface 13 that thickness reduces in the duplexer of two fiber assemblies, just can make in all sorts of ways.Preference such as heat embossing or ultrasonic wave embossed.Shown in Fig. 1 (a), junction surface 13 can be separate diffusing point-like, also can be linearity or curve-like (comprising continuous wave shape wave etc.), clathrate, zigzag shape etc.The shape at each junction surface when junction surface 13 is configured to loose point-like can be arranged to shape arbitrarily such as circle, triangle, quadrangle.
First fiber assembly and second fiber assembly after engaging are applied heat, make the heat-shrinkable filament contraction that contains in second fiber assembly.When the heat-shrinkable fiber is the potential crimping property fiber, make its performance curl and shrink.Owing to shrink, the formation fiber of second fiber assembly between junction surface 13 produces and shrinks, and the fibre density of second fiber assembly uprises.Be accompanied by this contraction, the formation fiber of first fiber assembly between junction surface 13 is that the core shift composite fibre has been lost the place to go of past in-plane and moved to thickness direction.Thus, protuberance between the junction surface 13 forms the low bulk protuberance 15 of fibre density.In addition, i.e. 13 the position at the junction surface between protuberance 15 forms the high recess 14 of fibre density.
In first fiber assembly, owing to the second fiber assembly thermal contraction makes this core shift composite fibre when the thickness direction of first fiber assembly moves, this core shift composite fibre is arranged along this thickness direction again.Its reason be owing to the abutment quantity of the bonding core shift composite fibre that produces of heat fusing in first fiber assembly is few, and the bond strength at this abutment is low as mentioned above.Its result, in protuberance 15, the great majority in the core shift composite fibre are towards the roughly thickness direction of this protuberance 15.In addition, the shape in the vertical section of protuberance 15 becomes the shape of roughly trapezoidal or essentially rectangular, have towards the wall portion 16 that erects of top roughly with link to each other with this wall portion 16 and the upper surface part 17 of general planar.Like this, the surface that has obtained the ground floor side is the nonwoven 10 of the structure that increases from ground floor 11 sides towards the second layer 12 sides of concaveconvex shape and fibre density.The manufacture method write up of above-mentioned nonwoven is in for example the applicant's previous application CN1348026A and CN1509864A.
In addition, the core shift composite fibre that contains in first fiber assembly might show because making the temperature of the second fiber assembly thermal contraction and curl and contraction.But, as mentioned above, consider the permeability of the flexibility of protuberance 15 and bulkiness, liquid, therefore it is curling that this core shift composite fibre is shown, and it is above and be lower than the curling performance temperature of the core shift composite fibre that contains in first fiber assembly that the heat shrink temperature of second fiber assembly is preferably the heat shrink temperature of the heat-shrinkable fiber that contains in second fiber assembly.
The face sheet, surgery that the nonwoven 10 that obtains as mentioned above can be used for various absorbent commodities such as sanitary napkin or underpants back boxing, disposable diaper for example is with various uses such as clothing class, cleaning sheet materials.When nonwoven 10 is particularly useful as the face sheet of absorbent commodity, can obtain the good and wearing comfort excellent absorption article of skin sense of touch.When nonwoven 10 is used as face sheet,, preferably dispose with the mode that user's skin contacts according to the ground floor side from the better viewpoint of skin sense of touch.
According to embodiment the present invention is described in further detail below.But scope of the present invention is not subjected to the restriction of these embodiment.
Embodiment 1
The manufacturing of (1) first fiber assembly
With core by PTT constitutes, sheath is made of high density polyethylene (HDPE) core shift core-sheath-type composite fibre (2.7dtex *, make fleece with combing method 51mm) as raw material.This fleece is blowed 145 ℃ ± 10 ℃ hot blast with the hot blast mode, thereby make between the fiber melt bonded.Like this, obtaining mass area ratio is 18g/m
2First fiber assembly that constitutes by hot blast method nonwoven.
The manufacturing of (2) second fiber assemblies
The heat-shrinkable composite fibre of the potential crimping property that will be made of polyethylene and polypropylene (2.3dtex * 51mm, the performance temperature of curling is about 100 ℃) as raw material, is 22g/m with combing method manufacturer area quality
2Second fiber assembly that constitutes by fleece.This potential crimping property fiber can show curling of three-dimensional spiral shape.
(3) manufacturing of nonwoven
First fiber assembly and second fiber assembly is overlapping, utilize ultrasonic wave embossed method that two fiber assemblies are engaged partly and obtain duplexer.The circle that is shaped as diameter 2mm at each junction surface that obtains by embossing is carried out according to the pattern of Fig. 1 (a).The distance between centers at each junction surface of adjacency is 7mm on length direction and the width.In hot-blast stove duplexer being blowed temperature with the hot blast mode is 5～10 seconds of hot blast of 115 ℃ ± 10 ℃, carries out thermal contraction and handles.Make the potential crimping property fiber crimp that contains in second fiber assembly thus, thereby each fiber assembly is shunk on the direction in its face.Its result in the ground floor that is formed by first fiber assembly, has formed a large amount of protuberances between the abutment.During thermal contraction is handled, control the length direction and the width of duplexer, limit excessive is shunk.Size after the contraction is 70% of a perisystolic size with regard to length direction, is 85% of perisystolic size with regard to width.Obtain like this Fig. 1 (a) and (b) shown in nonwoven.Mass area ratio is 66.4g/m
2
Embodiment 2
Except in thermal contraction is handled, changing the degree of confined contraction, be of a size of beyond the value shown in the table 1 after making thermal contraction, adopt with embodiment 1 identical method obtain Fig. 1 (a) and (b) shown in nonwoven.Mass area ratio is as shown in table 1.
Comparative example 1
As the formation fiber of first fiber assembly, use core by PETG constitutes, sheath is made of polyethylene concentric core-sheath-type composite fibre (2.4dtex * 51mm).In addition, employing obtains nonwoven with embodiment 1 identical method.Mass area ratio is as shown in table 1.
Comparative example 2
Except in thermal contraction is handled, changing the degree of confined contraction, be of a size of beyond the value shown in the table 1 after making thermal contraction, adopt and obtain nonwoven with comparative example 1 identical method.Mass area ratio is as shown in table 1.
Estimate 1
To the nonwoven that obtains in embodiment 1 and the comparative example 1, cut out and amplify with microscope behind its vertical section and take pictures.The microphotograph image table is shown among Fig. 4 (embodiment 1) and Fig. 5 (comparative example 1).Can know from these photos and to distinguish that in Fig. 4 (embodiment 1), protuberance has formed roughly trapezoidal shape.And distinguish and be full of fiber in the protuberance that the great majority in the fiber of protuberance are towards the roughly thickness direction of protuberance.Contrast can be distinguished in Fig. 5 (comparative example 1) with it, and protuberance has formed the shape that its upper surface is the semicircle sphere of level and smooth curved surface.And distinguish, although be full of fiber in the protuberance, nearly all fiber all along the profile of the spherical protuberance of semicircle towards transverse direction roughly.
And then, the nonwoven that obtains in embodiment 1 and the comparative example 1 is cut out the vertical section of protuberance, measure the angle of fiber and calculate the ratio that angle is the above fiber of 50 degree with above-mentioned method.The result is as shown in table 1.Can judge that from the result shown in the table 1 conform to microphotograph shown in Figure 5 with above-mentioned Fig. 4, in the nonwoven of embodiment 1, the great majority in the fiber of protuberance are towards the roughly thickness direction of protuberance.
Estimate 2
For the reason towards different in embodiment and comparative example of confirming the fiber in the protuberance is to cause owing to the difference of the melt bonded abutment quantity that produces between the fiber in the ground floor and/or the difference of bond strength, measured the first fibrolaminar hot strength that the hot blast method nonwoven that obtains in the operation by above-mentioned (1) constitutes.Mensuration is at the first fibrolaminar MD and CD and carry out.Distance is set at 150mm between the chuck of cupping machine.Specimen width is set at 50mm.Draw speed is set at 300mm/ minute.Measurement result is as shown in table 1.Can distinguish clearly that from the result shown in the table 1 the first fibrolaminar hot strength of embodiment is lower than the first fibrolaminar hot strength of comparative example.This means that the melt bonded abutment quantity that produces between the fiber in first fibrage is that embodiment is less than comparative example and/or bond strength is that embodiment is lower than comparative example.
Estimate 3
Nonwoven to embodiment and comparative example has been measured liquid residue in order to following method.With regard to liquid residue, its value is more for a short time to mean that the liquid permeability of nonwoven is good more.
From the sanitary napkin " ロ リ ェ (registration mark) さ ら さ ら Network ッ シ ョ Application " that Kao Corp makes, take out absorber.On this absorber, place the nonwoven that obtains in embodiment and the comparative example respectively.Nonwoven is of a size of 80mm * 60mm.Nonwoven is placed on the absorber according to its ground floor side mode up.The placement central portion has the rectangle acrylic panel that diameter is the hole of Ф 5mm on nonwoven.Acrylic panel is of a size of 20mm * 10mm.Inject 6g horse blood (the defiber blood that Japanese バ ィ ォ テ ス ト research institute makes) by above-mentioned hole, inject the back and placed for 30 seconds.Through taking down acrylic panel after 30 seconds, on nonwoven, place a thin paper that is converted into 4 layers.Placing weight more thereon is the rectangle metallic plate of 125g.Metallic plate is of a size of 105mm * 30mm.After placing for 5 seconds, take off metallic plate and thin paper, obtain weight attached to the horse blood on the thin paper.Should be worth as " liquid residue ".The result is as shown in table 1.Can know from the result shown in the table 1 and to distinguish that use the situation of the nonwoven of embodiment to compare with the situation of the nonwoven that uses comparative example, liquid residue still less.This result has supported it is to result from an embodiment, the fact of the roughly thickness direction of most of these protuberances of fiber orientation in the protuberance.
Estimate 4
4 nonwoven to embodiment and comparative example have carried out the sense evaluation with regard to flexibility.Allow 8 estimators touch nonwoven, will compile in order the soft degree that 4 nonwoven are felt is the 1st to the 4th order, with the mean value of the serial number yardstick as flexibility.Therefore, numerical value more for a short time mean soft more.The result is as shown in table 1.Can know from the result shown in the table 1 and to distinguish that the nonwoven of embodiment is compared with the nonwoven of comparative example, has more soft sense of touch.
Table 1
| Embodiment 1 | Embodiment 2 | Comparative example 1 | Comparative example 2 | ||
| Shrinkage factor (%) (with respect to the ratio of perisystolic size) | MD | 70 | 80 | 70 | 80 |
| CD | 85 | 95 | 85 | 95 | |
| The first fibrolaminar hot strength (N/50mm) | MD | 10.8 | 10.8 | 19.4 | 19.4 |
| CD | 4.7 | 4.7 | 8.3 | 8.3 | |
| Nonwoven | Thickness (mm) | 2.84 | 2.51 | 2.87 | 2.48 |
| Mass area ratio (g/m 2) | 66.4 | 61.3 | 67 | 59.5 | |
| Angle is the ratio (%) of the above fiber of 50 degree in the protuberance | 54.2 | - | 36.1 | - | |
| Liquid residue (mg) | 122 | 122 | 163 | 180 | |
| Flexibility (sense) | 1.4 | 1.6 | 3.4 | 3.6 |
Nonwoven of the present invention has good liquid permeability, and has soft hand feeling.Therefore, when nonwoven of the present invention for example is used as the face sheet of absorbent commodity, on this face sheet, be not easy the residual liquid of being drained, and the wearing comfort of absorbent commodity is good.
Claims (7)
1, a kind of nonwoven, its have the ground floor that comprises a face and comprise another face and contain thermal contraction after the second layer of fiber, above-mentioned two-layerly engage partly by a large amount of junction surfaces; In the ground floor side, be formed with recess and the protuberance between this recess in the position at described junction surface, described ground floor side has concaveconvex shape; Wherein, use the formation fiber of the core-sheath-type composite fibre of core shift as ground floor.
2, nonwoven as claimed in claim 1, wherein, the inside of described protuberance has been full of the material based on the core-sheath-type composite fibre of described core shift, and in described protuberance, the great majority in the described composite fibre are towards the roughly thickness direction of this protuberance.
3, nonwoven as claimed in claim 1 or 2, wherein, the core of the core-sheath-type composite fibre of described core shift is made of polyester resin, and sheath portion is made of polyolefin resin.
4, nonwoven as claimed in claim 3, wherein, the described polyester resin that constitutes core is polypropylene terephthalate's resin.
5, nonwoven as claimed in claim 1, wherein, being shaped as of the vertical section of described protuberance has the wall portion that erects to top roughly and links to each other with this wall portion and the shape of the upper surface part of general planar.
6, nonwoven as claimed in claim 1, it is as the face sheet of absorbent commodity.
7, a kind of absorbent commodity, as face sheet, wherein, described nonwoven disposes according to the mode that its ground floor side contacts with skin with each described nonwoven in the claim 1～6 for it.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP365161/2005 | 2005-12-19 | ||
| JP2005365161 | 2005-12-19 |
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| CN1986210A true CN1986210A (en) | 2007-06-27 |
| CN1986210B CN1986210B (en) | 2012-06-13 |
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| CN200610168984XA Active CN1986210B (en) | 2005-12-19 | 2006-12-19 | Non-woven fabric |
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