JP2016174741A - Absorbent article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent twist and cleft of an absorber by retaining a shape of slits, and preventing leakage by improving fitting property in a crotch part.SOLUTION: A disposable paper diaper 1 includes an absorber 13 of which an upper layer side and a lower layer side are covered by core wrap sheets 16, 17 and in which slits 18 penetrating in the thickness direction along a longitudinal direction are formed. A nonwoven sheet 19 including heat-sealable fibers is disposed between the absorber 13 at an area including the slits 18 and the lower-layer-side core wrap sheet 17, and the slits 18 are embossed 20 from an outer surface side of the upper-layer-side core wrap sheet 16 so as to integrate the upper-layer-side core wrap sheet 16 with the lower-layer-side core wrap sheet 17 at the slits 18.SELECTED DRAWING: Figure 2

Description

  The present invention relates to an absorbent article such as a disposable diaper, an incontinence pad, a sanitary napkin, and more specifically, an upper layer side and a lower layer side are covered with a core wrap sheet, and a slit that penetrates in the thickness direction along the longitudinal direction. The present invention relates to an absorbent article provided with the provided absorbent body.

  Conventionally, as absorbent articles such as disposable diapers, incontinence pads, sanitary napkins, etc., between a leak-proof sheet such as a polyethylene sheet or a polyethylene sheet laminated nonwoven fabric and a liquid-permeable top sheet such as a nonwoven fabric or a liquid-permeable plastic sheet In addition, there are known those that interpose an absorbent body made of cotton-like pulp, a highly water-absorbing polymer, or the like. The absorbent body is surrounded by a core wrap sheet made of crepe paper, nonwoven fabric or the like for shape retention and diffusibility improvement.

  Numerous improvements have been made to this type of absorbent article, and various types have been developed that improve fit and prevent leakage. For example, in Patent Document 1 below, the absorbent portion is composed of an absorbent material containing a superabsorbent polymer in a fiber assembly and an elastic material, and the main component of the elastic material is composed of heat-sealed fibers, There is disclosed an absorbent article in which an elastic material is integrated by at least one integration means selected from the group consisting of an adhesive, embossing, and heat fusion, and a crimp groove. Further, in the following Patent Document 2, including a liquid permeable envelope layer, a liquid barrier layer, an absorbent element included therebetween, and a liquid transfer layer disposed between the liquid permeable envelope layer and the absorbent layer, An absorbent product is disclosed in which the liquid permeable envelope layer is bonded to the liquid transfer layer with a distinctly thermally generated bond.

  Furthermore, in the following Patent Document 3, the absorber includes an absorbent core in which a superabsorbent polymer is embedded and held in a fiber material, a lower core wrap sheet that covers the absorbent core from the back sheet side, and the absorbent An upper layer core wrap sheet that covers the core from the top sheet side, and the absorbent core is disposed on the lower layer core wrap sheet with a gap extending in the longitudinal direction of the absorbent body. By joining the sheet and the upper layer core wrap sheet at a portion corresponding to the gap portion of the absorbent core, at least a groove portion extending in the longitudinal direction of the absorber is formed in the upper layer core wrap sheet of the absorber, and the groove portion An absorbent article in which a superabsorbent polymer is sandwiched between a lower layer core wrap sheet and an upper layer core wrap sheet is disclosed.

JP-A-10-216172 JP-T-2002-526279 JP 2012-179230 A

  However, in the above-mentioned Patent Documents 1 and 2, although predetermined embossing is given, the absorbent body is integrally formed over the entire surface. The slack and bulges are likely to occur, and the fit is not always sufficiently obtained. For this reason, there was a possibility that a gap was generated between the skin and the surface of the absorbent article and leakage occurred.

  In general, by forming a slit that penetrates in the thickness direction along the longitudinal direction in the absorbent body, the absorbent body is easily deformed. It is known that excessive swelling is suppressed, wrinkles and twists associated therewith are suppressed, and the absorbent article fits the wearer's body appropriately. For this reason, forming slits in the absorber can provide a good wearing feeling, reduce the gap with the skin surface to prevent leakage, and also improve the appearance when worn. It is said that it is preferable.

  However, when forming slits in the absorbent body, simply placing the pulp and polymer so as to provide a space in the slit portion, the movement of the attachment and the absorbent body absorbs excrement, etc. In some cases, the pulp or the polymer constituting the absorber moves into the space portion and fills the space portion of the slit. In particular, in the case of a thin absorber, there is a drawback that pulp and polymer are easily moved. When the surrounding pulp or polymer moves to the slit portion, there is a problem that the density of the absorber in the peripheral portion is lowered and the absorber is liable to be bent or cracked.

  About this point, in the thing of the said patent document 3, since the groove part which joins an upper-layer core wrap sheet and a lower-layer core wrap sheet in the part corresponding to the slit of an absorber is formed, in the space part of a slit, the circumference | surroundings Although the pulp and polymer can be prevented from moving, since the superabsorbent polymer is sandwiched between the lower layer core wrap sheet and the upper layer core wrap sheet in the groove portion, the bonding strength between the core wrap sheets tends to decrease, It was difficult to maintain the slit when the joint part was detached due to twisting during mounting.

  As disclosed in Patent Document 3, the core wrap sheet enters the slit space by joining the core wrap sheets on the upper layer side and the lower layer side that surround the absorber in the slit, thereby configuring the absorber. It is effective in that the slit shape can be maintained because the pulp and polymer to be moved are difficult to move, but when the core wrap sheet on the upper layer side and the lower layer side is made of crepe paper, it cannot be heat-sealed, and the core wrap Even when the sheet is made of non-woven fabric, the material used as the core wrap sheet is thin, so that holes may be formed or torn during heat fusion. Moreover, since the nonwoven fabric used as a core wrap sheet does not have a firmness, the movement of the pulp and polymer which comprise an absorber is suppressed, and it does not come to prevent the absorber from twisting and cracking.

  Therefore, the main problem of the present invention is to maintain the shape of the slit in the absorbent article including the absorbent body in which the slit penetrating in the thickness direction along the longitudinal direction is formed, and preventing the twist and crack of the absorbent body. An object of the present invention is to provide an absorbent article that improves fit at the crotch and prevents leakage.

In order to solve the above-mentioned problem, as the present invention according to claim 1, an absorption comprising an absorber in which an upper layer side and a lower layer side are covered with a core wrap sheet and a slit penetrating in the thickness direction along the longitudinal direction is formed. A sex product,
A nonwoven fabric sheet containing a heat-fusible fiber is disposed between the absorber in the region including the slit and the lower layer side core wrap sheet, and embossing the slit from the outer surface side of the upper layer side core wrap sheet. By applying, the absorbent article characterized in that the upper layer side core wrap sheet and the lower layer side core wrap sheet are integrated in the slit is provided.

  The invention according to claim 1 is an absorbent article including an absorbent body that is covered with the upper layer side core wrap sheet and the lower layer side core wrap sheet and has slits that penetrate in the thickness direction along the longitudinal direction. . And the nonwoven fabric sheet containing a heat-fusible fiber is arrange | positioned between the absorber of the area | region containing the said slit, and a lower layer side core wrap sheet | seat. Furthermore, the upper layer side core wrap sheet and the lower layer side core wrap sheet are integrated in the slit by embossing the slit from the outer surface side of the upper layer side core wrap sheet. That is, by heating at the time of embossing, the upper layer side core wrap sheet and the lower layer side core wrap sheet are integrated through the nonwoven fabric sheet by the heat sealing action or adhesive action of the heat fusible fibers contained in the nonwoven fabric sheet. (Adhesion).

  Thereby, since the upper layer side core wrap sheet is interposed in the slit, it is possible to prevent the pulp and polymer constituting the absorber from moving in the space portion of the slit, and it is easy to maintain the shape of the slit, and You can prevent twisting and cracking. Moreover, since the slit shape can be maintained, the absorber is easily deformed along the body, the fitting property at the crotch is improved, and leakage can be reliably prevented.

As the present invention according to claim 2, wherein the nonwoven sheet is made of air-through nonwoven fabric having a basis weight of 10 to 50 g / m ^2, the absorbent article according to claim 1, characterized in that it arranged wider than the slit region is provided.

  In the invention of claim 2, the air-through non-woven fabric having a predetermined basis weight is used as the non-woven fabric sheet, and the non-woven fabric sheet is disposed in a region wider than the slit, whereby the polymer spilled from the absorbent body into the gaps of the fibers of the non-woven fabric sheet. Enters and suppresses the polymer from moving to the slit portion. Accordingly, when the embossing is performed, the polymer is interposed between the upper layer side core wrap sheet and the lower layer side core wrap sheet, so that it is possible to prevent the bonding strength from being lowered.

  As the present invention according to claim 3, there is provided the absorbent article according to any one of claims 1 and 2, wherein the nonwoven fabric sheet comprises short fibers having a fiber length of 5 to 100 mm.

  In the invention of claim 3, the nonwoven fabric sheet is made of short fibers having a predetermined fiber length so that the polymer dropped off from the absorbent body can easily enter the gaps between the fibers of the nonwoven fabric sheet, and the polymer moves to the slit. Is suppressed.

  As this invention which concerns on Claim 4, the said slit is spaced apart in the width direction of an absorbent article, and multiple strips are provided, The said nonwoven fabric sheet is continuously arrange | positioned in the area | region containing all these slits. 3. An absorbent article according to any one of 3 is provided.

  In the invention according to the fourth aspect, when the slits are provided in a plurality of spaced apart in the width direction of the absorbent article, the nonwoven fabric sheet is continuously arranged in a region including all these slits. The polymer that has fallen off from the absorbent body is received by the nonwoven fabric sheet, so that the polymer can be reliably prevented from moving to the slit portion.

  As this invention which concerns on Claim 5, the said core wrap sheet | seat consists of crepe paper, The absorbent article in any one of Claims 1-4 is provided.

  In the invention of claim 5 above, even when the core wrap sheet is made of crepe paper, the crepe papers are integrated by the heat fusion action or the adhesion action of the heat-fusible fibers contained in the nonwoven fabric sheet ( Can be glued).

  As the present invention according to claim 6, a liquid-permeable top sheet is disposed on the upper layer side of the absorber, and the embossing is applied from the outer surface side of the liquid-permeable top sheet. The absorbent article described is provided.

  In the invention of claim 6, when the embossing is applied from the outer surface side of the liquid-permeable top sheet, when the bonding strength is insufficient only by the heat-sealing action of the heat-sealing fibers contained in the nonwoven fabric sheet, The bonding between the upper layer side core wrap sheet and the lower layer side core wrap sheet is reinforced by the heat-sealing action of the liquid-permeable top sheet.

  As this invention which concerns on Claim 7, while a liquid-permeable top sheet is arrange | positioned at the upper layer side of the said absorber, an intermediate sheet is arrange | positioned between the said liquid-permeable top sheet and an absorber, The said embossing is the said The absorbent article in any one of Claims 1-5 currently provided from the outer surface side of a liquid-permeable top sheet or the outer surface side of the said intermediate sheet.

  In the invention described in claim 7, when an intermediate sheet is disposed between the liquid-permeable top sheet and the absorbent body, the embossing is performed from the outer surface side of the liquid-permeable top sheet or the outer surface side of the intermediate sheet. Thus, the bonding between the upper layer side core wrap sheet and the lower layer side core wrap sheet is reinforced by these heat-sealing actions.

  As the present invention according to claim 8, there is provided the absorbent article according to any one of claims 1 to 7, wherein the emboss comprises a number of pin-like embosses or dot-like embosses.

  In the invention described in claim 8, the embossing pattern applied to the slit is a large number of pin-like embossments or dot-like embossments. When the embossed pattern is a continuous squeezed pattern, when a part of the emboss is peeled off when the absorbent article is mounted, there is a disadvantage that the embossed pattern tends to peel off so as to propagate continuously to the whole, In the case of a large number of pin-like embossments or dot-like embossments, even if some pin-like embossments or dot-like embosses are peeled off, the load is dispersed at the spacing provided between adjacent embosses. Thus, the embossing can be prevented from peeling off.

  As the present invention according to claim 9, there is provided an absorbent article according to claim 8, wherein three or more pin-like embossments or dot-like embossments are not arranged at equal intervals along the slit.

  In the invention according to the ninth aspect, the pin-shaped emboss or the dot-shaped emboss is provided in a pattern in which three or more are not arranged at equal intervals along the slit. This makes it possible to prevent body fluid from rapidly diffusing along the pin-like embossment or dot-like embossment.

  As the present invention according to claim 10, there is provided the absorbent article according to any one of claims 1 to 9, wherein the emboss is formed so as to be gradually narrowed or gradually widened toward a central portion of the slit.

  In the invention according to claim 10, since the upper layer side core wrap sheet and the lower layer side core wrap sheet are joined in the slit, the absorber around the slit is held at a certain height by being pulled by the core wrap sheet. In order to solve the problem that the amount of body fluid absorbed may not be increased, the embossed pattern is gradually narrowed or gradually widened toward the center of the slit, thereby forming a slit shape. The core wrap sheet does not prevent the absorbent body from expanding when wet. When the emboss is constituted by pin-like embossing or dot-like embossing, the pin-like embossing or dot-like embossing area is formed so as to be gradually narrower or gradually wider toward the center of the slit. To do.

  As described above in detail, according to the present invention, the shape of the slit can be maintained, and the absorbent body can be prevented from twisting or cracking, and the fitting property in the crotch can be improved, thereby providing an absorbent article capable of preventing leakage. .

It is a partial fracture development view of disposable diaper 1 concerning the present invention. It is the II-II arrow directional view of FIG. The absorber 13 which shows the absorber 13, (A) is a top view, (B) is a BB line arrow directional view of (A). It is sectional drawing of the absorber 13 which shows the construction procedure of the embossing 20. FIG. It is a top view of the absorber 13 which concerns on another form example. It is sectional drawing of the absorber 13 which shows the construction procedure of the embossing 20 which concerns on another form example. It is an enlarged plan view (the 1) of the slit 18 part which shows an emboss pattern. It is an enlarged plan view (the 2) of the slit 18 part which shows an emboss pattern. It is an enlarged plan view (the 3) of the slit 18 part which shows an emboss pattern. It is an enlarged plan view (the 4) of the slit 18 part which shows an emboss pattern. It is a top view of the absorber 13 which shows a bodily fluid diffusion state. It is an enlarged plan view (the 5) of the slit 12 part which shows an emboss pattern. It is a top view of the absorber 13 which shows a bodily fluid diffusion state.

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

(Basic structure of disposable disposable diaper 1)
As shown in FIGS. 1 and 2, the disposable paper diaper 1 (hereinafter also simply referred to as a diaper) is provided between a liquid-permeable top sheet 11 made of a nonwoven fabric and a waterproof sheet 12 made of polyethylene or the like. The absorbent body 13 made of cotton-like pulp or the like encapsulated by a core wrap sheet made of nonwoven fabric or crepe paper is interposed, and three-dimensional gathers BS and BS standing on the skin side are formed on both sides of the skin surface side. It consists of the absorptive main body 10 in which the gathered nonwoven fabric 15 is disposed, and the outer sheet 30 integrally provided on the outer surface side of the absorptive main body 10, and in the product state, the outer sheet 30 at the central portion in the diaper longitudinal direction. The front body F and the back body B are overlapped, and the joint edges 31 and 32 at both ends are joined to form a waist opening and a pair of left and right leg openings. It is a pants-type diaper of the structure.

  In the illustrated example, the absorbent body 13 is formed with a substantially square shape in plan view, and the width dimension thereof is a dimension width that does not give the wearer a feeling of gore by hitting the crotch portion. The absorbent body 13 is encapsulated by a core wrap sheet in order to maintain the shape and improve the diffusibility of body fluid that has passed through the liquid-permeable top sheet 11. The absorber 13 will be described in detail later.

  As the liquid-permeable top sheet 11 covering the skin surface side (upper layer side) of the absorbent body 13, a porous or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers that make up the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, and polyamides, 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 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. When a large number of through holes are formed in the liquid permeable top sheet 11, urine and the like are quickly absorbed, and the dry touch property is excellent. The liquid-permeable top sheet 11 may cover only the skin surface side of the absorbent body 13, or the side edge of the absorbent body 13 may be rolled up to the non-skin surface side (waterproof sheet 12 side) of the absorbent body 13. You may arrange so that it may exist.

  As the waterproof sheet 12 that covers the non-skin surface side (lower layer side) of the absorbent body 13, a liquid-impervious plastic sheet such as polyethylene or polypropylene is used, but in recent years, a sheet having moisture permeability is preferable from the viewpoint of preventing stuffiness. Used for. This water-impervious / breathable sheet is a microporous sheet obtained by, for example, melt-kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching in a uniaxial or biaxial direction. If the sheet thickness is the same, the rigidity is lower than that of the non-porous sheet, which is superior in terms of flexibility.

  The core wrap sheet encapsulating the absorbent body 13 is wound on both sides of the absorbent body 13 and extends from the back surface side to the front surface side, and the end portions are overlapped at the central portion in the width direction on the front surface side (so-called forehead winding) May be composed of one sheet, or may be composed of two sheets each having a separate sheet on the upper layer side (skin side) and lower layer side (non-skin side) of the absorber 13. Good. In any case, the upper layer side core wrap sheet 16 covers the upper layer side of the absorber 13, and the lower layer side core wrap sheet 17 covers the lower layer side of the absorber 13. This core wrap sheet will be described in detail later.

  On the other hand, the gathered nonwoven fabric 15 that forms the three-dimensional gather BS is disposed on both side portions on the skin surface side of the absorbent body 13, and the outer edge in the width direction extends outward from the outer edge in the width direction of the absorbent body 13. .

  The gathered non-woven fabric 15 is a non-woven fabric made into a double sheet by folding, and is wound around the side edge of the absorbent body 13 and extends to the back surface side of the absorbent body 13. Inside the gathered nonwoven fabric 15 formed of the double sheet nonwoven fabric, one or a plurality of thread-like elastic members (not shown) spaced at appropriate intervals in the standing direction are disposed at the standing tip portion. . As shown in FIG. 2, the thread-like elastic member is for forming a three-dimensional gather BS by erecting the inner side portion of the gathered nonwoven fabric 15 by elastic stretching force.

  In the same manner as the liquid-permeable top sheet 11, the material fiber constituting the gathered nonwoven fabric 15 is made of synthetic fibers such as polyethylene or polypropylene, synthetic fibers such as polyester or polyamide, regenerated fibers such as rayon or cupra, Non-woven fabric obtained by an appropriate processing method such as a spunbond method, a thermal bond method, a melt blown method, a needle punch method, etc. can be used. It is preferable to use a non-woven fabric with a low basis weight and excellent air permeability. Further, with respect to the gathered nonwoven fabric 15, in order to prevent the transmission of urine and the like, to prevent fogging and to improve the feel to the skin (dry feeling), a silicon-based, paraffin-metal-based, alkylchromic chromoid-based water repellent It is desirable to use a water-repellent non-woven fabric coated with such as.

  Next, as shown in FIGS. 1 and 2, the exterior sheet 30 is a nonwoven fabric sheet having a two-layer structure composed of an upper nonwoven fabric 30A and a lower nonwoven fabric 30B, and various types are provided between the upper nonwoven fabric 30A and the lower nonwoven fabric 30B. Elastic elastic members 34 and 35 are provided to provide elasticity. The planar shape is formed with a concave notch 39 for forming leg openings on both sides of the middle, and has a pseudo hourglass shape as a whole. As the elastic elastic member, as shown in FIG. 1, the waist elastic elastic members 34, 34... Arranged in the waist opening and the front body F and the back body B are spaced apart in the vertical direction. A plurality of waist elastic elastic members 35, 35... Arranged along the horizontal direction.

(About absorber structure)
As shown in FIG. 2, the absorbent body 13 is covered with an upper layer side core wrap sheet 16 and a lower layer side core wrap sheet 17 on the upper layer side and the lower layer side, respectively. In addition, as shown in FIG. 3, in the illustrated example, one or a plurality of slits 18, 18 penetrating in the thickness direction along the longitudinal direction are formed at intervals in the width direction. .

  As shown in FIGS. 1 and 2, a nonwoven fabric sheet 19 containing heat-fusible fibers is disposed between the absorber 13 in the region including the slits 18 and 18 and the lower core wrap sheet 17. ing. And by embossing 20 with respect to each of the slits 18 and 18 from the outer surface side of the upper layer side core wrap sheet 16, heat fusion of the heat-fusible fiber contained in the nonwoven fabric sheet 19 accompanying heating during embossing. By the action or the adhesive action, the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are integrated (adhered) through the nonwoven fabric sheet 19 in the slit 18.

The absorber 13 has a structure in which a superabsorbent polymer (SAP) is mixed into a fiber assembly. The fiber aggregate is preferably composed of a structure in which cotton-like pulp, synthetic fibers, or the like are stacked. The basis weight of the fiber can be about 100 to 300 g / m ² . The fineness in the case of a synthetic fiber is 1-16 dtex, for example, Preferably it is 1-10 dtex, More preferably, it is 1-5 dtex.

  The superabsorbent polymer is desirably dispersed substantially throughout the thickness direction with respect to the fiber assembly. If there is no superabsorbent polymer in the upper part, the lower part and the middle part of the absorbent body 13 or if there is very little, it cannot be said that it is “dispersed in the whole thickness direction”. Therefore, “distributed in the entire thickness direction” means “distributed unevenly in the upper, lower, and / or middle portions of the fiber assembly in addition to the form“ uniformly ”distributed in the entire thickness direction. ”Is still dispersed in the upper, lower and middle portions. Further, a form in which a part of the superabsorbent polymer does not penetrate into the fiber assembly and remains on the surface thereof, or a part of the superabsorbent polymer passes through the fiber assembly and is a sheet on the lower layer side of the absorber 13 The above form is not excluded.

  The superabsorbent polymer includes those made of powder in addition to particles. As the superabsorbent polymer, those having a particle size used for this kind of absorbent article can be used as they are, and the average particle size is 1000 μm or less, preferably those having an unabsorbed particle size of 106 μm or more are 99% by weight in total. % Or more, particularly 150 to 850 μm is preferably 99% by weight or more. The average particle size at the time of non-absorption is preferably about 250 to 500 μm. In addition, it is desirable that the superabsorbent polymer has an average particle size after absorption of not less than 3 times the average particle size when not absorbed, specifically 500 μm or more. The average particle size of the superabsorbent polymer when not absorbed means the particle size at an integrated value of 50% in the weight-based particle size distribution. The weight-based particle size distribution in this case is measured according to JISZ8815-1994. That is, 710 μm, 500 μm, 300 μm, 150 μm, and 106 μm aperture sieves having an inner diameter of 150 mm and a depth of 45 mm are stacked with the narrow aperture sieve on the top, and the top 710 μm sieve having the widest aperture. 50 g of the measurement sample is put in, sieved with a sieve vibrator for 10 minutes, the weight of the measurement sample remaining on each sieve is measured, and the measurement sample remaining on each sieve based on the weight of the first measurement sample is measured. Measured by determining weight percent.

  The material of the superabsorbent polymer can be used without any particular limitation, but those having a water absorption of 40 g / g or more are suitable. Examples of superabsorbent polymers include starch, cellulose, and synthetic polymers. Starch-acrylic acid (salt) graft copolymer, starch-acrylonitrile copolymer saponified product, sodium carboxymethylcellulose cross-linked product And acrylic acid (salt) polymers can be used. As the shape of the superabsorbent polymer, a commonly used granular material is suitable, but other shapes can also be used.

  As the superabsorbent polymer, a polymer having a water absorption rate of 70 seconds or less, particularly 40 seconds or less is preferably used. If the water absorption rate is too slow, so-called reversal of the liquid supplied into the absorbent body easily returns to the outside of the absorbent body.

The basis weight of the superabsorbent polymer can be appropriately determined according to the amount of absorption required for the use of the absorber 13. Therefore, although it cannot be said unconditionally, it can be set to 50 to 350 g / m ² . When the basis weight of the polymer is less than 50 g / m ^2, it is difficult to secure the absorption amount. When it exceeds 350 g / m ² , not only the effect is saturated, but also the sensation of incongruity due to the excess of the superabsorbent polymer is given.

The upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 may be water-permeable materials such as crepe paper and hydrophilic nonwoven fabric, but are excellent in shape retention and prevent pulp and polymer from falling off. It is preferable to use crepe paper. As the crepe paper, thin paper or tissue paper can be used, and is not particularly limited. However, the basis weight is preferably 13 to 20 g / m ² , particularly 14 to 18 g / m ² .

  When a nonwoven fabric is used for the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17, hydrophilic ones are preferable, SMS (spunbond / meltblown / spunbond), SMMS (spunbond / meltblown / meltblown / spun). A composite nonwoven fabric such as a bond), a point bond nonwoven fabric, a polylaminated nonwoven fabric, and the like can be suitably used.

  When the upper layer side and the lower layer side of the absorber 13 are respectively covered with separate core wrap sheets, the upper layer core wrap sheet 16 and the lower layer side core wrap sheet 17 may be made of different materials. For example, the upper layer side core wrap sheet 16 is made of non-woven fabric from the viewpoint of softening the skin contact and enhancing the cushioning property, and the lower layer side core wrap sheet 17 is made of crepe paper from the viewpoint of preventing pulp and polymer from falling off. May be used. Moreover, it is also possible to use the material from which hydrophilicity differs, and the nonwoven fabric from which fiber density differs by the upper layer side core wrap sheet | seat 16 and the lower layer side core wrap sheet | seat 17. FIG. Furthermore, a water-impermeable waterproof sheet (see the waterproof sheet 12) can be used as the lower layer side core wrap sheet 17.

  When the upper layer side and the lower layer side of the absorbent body 13 are respectively covered with separate core wrap sheets, the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are disposed at the periphery of the absorbent body 13. In the portion where the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are directly overlapped with each other without being interposed, it is preferable to join by a joining means such as a hot melt adhesive or heat seal (see FIG. 4A). ). It is preferable to provide the peripheral joint portion in a pattern that is continuous along the circumferential direction of the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 so that the pulp and polymer of the absorbent 13 contained therein do not spill out. .

  The slit 18 provided in the absorbent body 13 is formed along the longitudinal direction of the absorbent body 13, that is, along the front-rear direction of the disposable paper diaper 1. Forming along the longitudinal direction means that the straight line connecting the ends of the slit 18 is within the range of 0 to ± 45 ° with respect to the longitudinal line of the absorber 13, as shown in FIG. In addition to those formed linearly in the longitudinal direction, those formed by curves and wavy lines are also included.

The slit 18 penetrates in the thickness direction of the absorbent body 13, that is, forms a space portion in which no member such as pulp or polymer constituting the absorbent body 13 is interposed from the skin side surface to the non-skin side surface of the absorbent body 13. Further, the slit 18 is formed in the middle in the longitudinal direction with respect to the plane of the absorber 13. In other words, the slits 18 are formed at the intermediate portion where the longitudinal ends of the slit 18 do not reach the longitudinal edges of the absorber 13. Specifically, as shown in FIG. 1, a region including the crotch portion of the wearer, in particular, a concave notch 39 for forming leg opening portions on both sides of the exterior sheet 30, overlaps with the diaper width direction. It is preferable to provide the region. Since this region is a region where a large pressure is applied by the base of the leg from both sides in the width direction when the disposable paper diaper 1 is mounted, the absorbent body 13 is easily deformed by the slit 18 and the diaper surface fits along the skin surface. It is preferable to be able to do this.

As the nonwoven fabric sheet 19 disposed between the absorbent body 13 and the lower side core wrap sheet 17, basis weight 10 to 50 g / ^{m 2,} and it is preferably used air-through nonwoven fabric 20 to 40 g / ^{m 2.} Since the air-through nonwoven fabric is generally random in fiber arrangement, the superabsorbent polymer spilled from the absorbent body 13 easily enters the gap between the fibers and stops there, so that the superabsorbent polymer is on the nonwoven fabric sheet 19. Can be prevented from moving. The thickness of the nonwoven fabric sheet 19 is 0.05 to 5 mm, preferably 0.3 to 1 mm.

  As the heat-fusible fiber contained in the nonwoven fabric sheet 19, any fiber that melts by heating and exhibits adhesiveness can be used. This heat-fusible fiber may be composed of a single fiber or a composite fiber in which two or more kinds of synthetic resins are combined. Specific examples include polyolefin single fibers such as polyethylene, polypropylene and polyvinyl alcohol, polyethylene terephthalate / polyethylene, polyethylene terephthalate / polypropylene, polypropylene / polyethylene, polyethylene terephthalate-ethylene / propylene copolymer, low-melting point polyester-polyester, etc. A core-sheath type composite fiber or an eccentric core-sheath type composite fiber whose sheath part is made of a relatively low melting point, or a part of each component made of polyethylene terephthalate / polypropylene, polyethylene terephthalate / nylon, polypropylene / polyethylene is the surface Splitting by heat shrinkage of one component consisting of split type composite fiber or polyethylene terephthalate / ethylene-propylene copolymer exposed in Or the like can be used composite fibers. In this case, a core-sheath type composite fiber is preferable when productivity and dimensional stability are important, and an eccentric type composite fiber is preferable when importance is placed on volume. In addition, if importance is attached to flexibility, when a split type composite fiber or a heat split type composite fiber is used, each component can be easily divided into ultrafine fibers by high-pressure water flow treatment.

  The nonwoven fabric sheet 19 preferably contains 20 to 90% of heat-fusible binder fibers. When the heat-fusible binder fiber is less than 20% by weight, the bonding ratio is small due to the heat-bonding of the fibers, and a predetermined bonding strength cannot be ensured. On the other hand, if it exceeds 90% by weight, the whole is cured and the texture is impaired.

  The nonwoven fabric sheet 19 is preferably mainly composed of short fibers having a fiber length of 5 to 100 mm, particularly 30 to 70 mm. By comprising short fibers, fiber gaps are easily formed on the surface, and the superabsorbent polymer spilled from the absorber 13 easily enters the gaps between the fibers, and the superabsorbent polymer moves on the nonwoven fabric sheet 19. Can be suppressed. The short fibers are contained in an amount of 50 to 100%, preferably 60 to 80%, based on the total weight (the total weight of the nonwoven fabric sheet 19).

  The nonwoven fabric sheet 19 may be a single layer or may be configured by laminating a multilayer nonwoven fabric sheet 19. When the multilayer nonwoven fabric sheet 19 is laminated, the superabsorbent polymer that has fallen off from the absorbent body 13 stays between the nonwoven fabric sheets 19 and 19, thereby further suppressing the movement of the superabsorbent polymer. Can do.

  As shown in FIG. 1, the nonwoven fabric sheet 19 is disposed in a region including the slit 18 in a plan view of the absorbent body 13. The region including the slit 18 is a region overlapping with all or a part of the slit 18 in the thickness direction, and is preferably disposed in a region including the entire slit 18 and wider than the slit 18.

  As shown in FIG. 1 and FIG. 2, when the slit 18 is provided with a plurality of strips (two strips) spaced apart in the width direction of the disposable paper diaper 1, the nonwoven fabric sheet 19 includes both the slits 18 and 18. It is preferable to arrange them continuously in the region. That is, it is preferable that the nonwoven fabric sheet 19 is continuously disposed across the slits 18 and 18 that are spaced apart in the width direction, and also in a separated portion between the slits 18 and 18. Thereby, since the superabsorbent polymer dropped from the absorbent body 13 between the slits 18 and 18 enters the gaps between the fibers of the nonwoven fabric sheet 19, the superabsorbent polymer can be prevented from moving to the slit 18 portion.

  In order to apply the embossing 20, as shown in FIG. 4, the nonwoven fabric sheet 19 is disposed on the non-skin side of the absorbent body 13, and the upper layer side and lower layer of the laminate of the absorbent body 13 and the nonwoven fabric sheet 19 are disposed. In a state where the side is integrally covered with the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 (FIG. 4A), the outer side (skin side) of the upper layer side core wrap sheet 16 This is applied to the slit 18 (FIG. 4B). Then, as shown in FIG. 4 (C), the upper layer side core wrap is obtained by the heat fusion action or the adhesion action of the heat-fusible fibers contained in the nonwoven fabric sheet 19 accompanying the heating when the emboss 20 is applied. The sheet 16 and the lower layer side core wrap sheet 17 are integrated (adhered). For this reason, even when the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are made of a material having no heat fusibility, such as crepe paper, the heat fusible fibers contained in the nonwoven fabric sheet 19 are heat fusible. The upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are fused (adhered) to both surfaces of the non-woven fabric sheet 19 by adhesion or adhesive action, respectively, and the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 Can be integrated.

  In the present disposable paper diaper 1, the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are integrated by embossing 20 on the slit 18, and the core wrap sheet is interposed in the space portion of the slit 18, It is possible to prevent the pulp and the polymer constituting the absorber 13 from moving into the space portion of the slit 18 due to the movement during mounting and the absorption body 13 absorbing excrement, so that the shape of the slit 18 can be maintained. At the same time, it is possible to prevent the absorbent 13 from being twisted or cracked by the pulp or polymer moving to the space portion of the slit 18. Moreover, since the shape of the slit 18 can be maintained, the deformability of the absorbent body 13 due to the provision of the slit 18 can be secured, and the fit of the crotch portion due to the deformation of the absorbent body 13 along the body is maintained. At the same time, the diaper surface fits the skin surface, so that leakage can be reliably prevented.

  Moreover, since the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 are integrated by the heat sealing action of the heat fusible fiber contained in the nonwoven fabric sheet 19, the crepe is used as the core wrap sheets 16 and 17. Even when paper is used, these joints are possible. Further, even when thin nonwoven fabrics are used as the core wrap sheets 16 and 17, since they are reinforced by the nonwoven fabric sheet 19, it is possible to prevent holes from being torn or torn during heat fusion, and the core wrap sheets. The stiffness of 16 and 17 becomes stronger, and the movement of pulp and polymer can be surely suppressed.

  The planar shape of the slit 18 is preferably formed in an elongated shape along the longitudinal direction of the absorber 13. Specifically, as shown in FIG. 3, a straight line (strip shape) along the longitudinal direction of the absorber 13, or as shown in FIG. Can be formed in a curved shape. Further, as shown in FIG. 5 (B), a linear slit 18 is disposed at the center in the width direction, and curved slits 18 and 18 bulging toward the center in the width direction are disposed on both sides thereof. As described above, a linear shape and a curved shape may be combined.

  It is preferable that one or more slits 18 are arranged with respect to the absorber 13 and arranged symmetrically with respect to the width direction of the absorber 13. In the example shown in FIG. 3, a total of two slits 18, 18 are provided on both sides of the longitudinal center line of the absorber 13, and are separated from each other in the width direction. In the example shown in FIG. 5 (B), one slit 18 is formed along the longitudinal direction at the center of the absorbent body 13 in the width direction, and one slit is formed on both sides of the slit 18 in the width direction. Each slit 18, 18 is formed, and a total of three slits 18, 18, ... are provided.

  The longitudinal dimension of the slit 18 is preferably 20 to 80% with respect to the longitudinal dimension of the absorber 13. The width of the slit 18 is preferably as wide as possible so that the bonding strength between the upper-layer core wrap sheet 16 and the lower-layer core wrap sheet 17 does not extremely decrease when pulp or polymer enters. . However, if the width is too large, the absorption performance is lowered, so that the slit width per one is 5-30 mm, preferably 10-15 mm.

  When the liquid-permeable top sheet 11 is disposed on the upper layer side of the absorbent body 13 like the disposable paper diaper 1, the emboss 20 is formed on the outer surface of the liquid-permeable top sheet 11 as shown in FIG. You may give from the side (upper layer side, skin surface side). Thus, as shown in FIG. 6B, the liquid-permeable top sheet 11, the upper layer side core wrap sheet 16, the nonwoven fabric sheet 19 and the lower layer side core wrap sheet 17 are integrated (adhered) by heating during embossing. ) The embossing 20 is applied by this method when the bonding strength between the upper-layer core wrap sheet 16 and the lower-layer core wrap sheet 17 is insufficient only by the heat-bonding action or adhesive action of the heat-fusible fibers of the nonwoven fabric sheet 19. Is particularly effective. That is, by embossing 20 from the outer surface side of the liquid-permeable top sheet 11, the liquid-permeable top sheet 11 is heated at the time of embossing, and the heat-fusible fibers contained in the liquid-permeable top sheet 11 are melted, so that the upper layer side The core wrap sheet 16 is infiltrated into the lower layer side so that the bonding strength between the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 can be reinforced.

  Although not shown in the drawings, an intermediate sheet containing heat-fusible fibers is disposed between the liquid-permeable top sheet 11 and the absorber 13, and then the emboss 20 is moved from the outer surface side of the liquid-permeable top sheet 11. By applying, the liquid-permeable top sheet 11, the intermediate sheet, the upper layer side core wrap sheet 16, the nonwoven fabric sheet 19, and the lower layer side core wrap sheet 17 may be integrated. In addition, the intermediate sheet is disposed on the skin side of the absorbent body 13 and the emboss 20 is applied from the outer surface side of the intermediate sheet before the liquid-permeable top sheet 11 is disposed. The side core wrap sheet 16, the nonwoven fabric sheet 19, and the lower layer side core wrap sheet 17 may be integrated.

  The emboss 20 may be a continuous squeeze pattern that squeezes the entire emboss bottom, but as shown in FIG. 7, a number of pin-like embosses or dot-like embosses (hereinafter “pin-like emboss” It is also preferable to set 21, 21. In the continuous squeeze-like embossing pattern, when a part of the embossing is peeled off when the diaper is worn, there is a drawback that it is easy to peel off so as to propagate continuously with this as a starting point. Even if a part of the emboss is peeled off, the embossing adjacent thereto is separated, so that the load applied to the embossing is dispersed and the embossing can be prevented from being peeled off continuously. The pin-shaped emboss 21 is preferably formed in two or more rows along the emboss in order to ensure emboss strength. As a result, even if the embossment in one row is peeled off, the embossment can be maintained by the embossment in another row.

  The boundary for distinguishing the pin-shaped emboss from the dot-shaped emboss is not necessarily clear, but the pin-shaped emboss is an emboss formed in a relatively small area, and the embossed shape is formed long in the longitudinal direction. This means that the ratio between the longitudinal dimension and the transverse dimension perpendicular to this is relatively small. The dot-like emboss is formed with a larger area than the pin-like emboss. There is a concept including an embossed shape that is formed long in the longitudinal direction even if the area is small, that is, a ratio of a dimension in the longitudinal direction and a dimension in the transverse direction perpendicular thereto.

The planar dimension of the pin-shaped emboss 21 (diameter when circular, long dimension when formed long in the longitudinal direction) is preferably 0.5 to 2 mm, and the ratio of the longitudinal dimension to the short dimension is The ratio is preferably 1: 1 to 5: 1. Further, as shown in FIG. 7, the separation distance L in the direction along the slit 18 between the adjacent pin-shaped embosses 21 and 21 is preferably 0.5 to 5 mm. The separation distance B from the side edge of the slit 18 to the pin-shaped emboss 21 adjacent thereto is preferably 0.5 to 5 mm. If the pin-shaped emboss 21 is provided at a position closer than 0.5 mm from the side edge of the slit 18, the absorber 13 may be squeezed by mistake, and when the absorber 13 absorbs water and swells, it is pulled and embossed. There is a risk that a large load is applied to the water or that water absorption is hindered. On the other hand, the distance L _E of the pin-shaped emboss 21, 21 adjacent the slit end is preferably reduced slightly so as not enter the pulp and the polymer in the slit 18, specifically, L E ₌ 0 .2 to 3 mm is preferable.

  The pin-shaped emboss 21 is preferably arranged densely with respect to the slit 18 from the viewpoint that the body fluid in the emboss penetrates into the core wrap sheet through the pin-shaped emboss 21 and does not easily remain. When the pin-shaped embosses 21, 21... Are arranged in close proximity and continuously, a rapid liquid flow is generated along the pin-shaped embosses 21, 21,. There is a risk of flowing out of 18. Therefore, in order to prevent an abrupt liquid flow along the pin-shaped emboss 21, three or more pin-shaped embosses 21 are not adjacently spaced along the slit 18, and a separation portion having a relatively large separation distance is provided. It is preferable to use a pattern that is arranged at a rate of one or more in three pin-shaped embosses 21 adjacent along the slit 18. The separation distance of the separation portion having a relatively large separation distance is preferably about 1.5 to 3 times the separation distance of the separation portion having a relatively small separation distance. However, as shown in FIG. 9B, even when the pin-shaped embosses 21 are continuously arranged adjacent to each other along the slit 18, there is a space where the pin-shaped embosses 21 are not provided in the width direction. In this case, the body fluid that has permeated the core wrap sheet diffuses into this space portion, and the liquid flow is less likely to occur. In this case, the width of the space is preferably about 3 to 5 times the separation distance of the pin-shaped embosses 21 and 21 with respect to the longitudinal direction of the slit 18. If the width of the space portion is too large, body fluid tends to accumulate in the space portion, and the body fluid is not easily absorbed by the absorber.

  Next, a modification of the emboss pattern of the pin-shaped emboss 21 will be described. As shown in FIG. 10, the application region of the pin-shaped emboss 21 gradually becomes narrower toward the center of the slit 18 as a whole. It can arrange | position so that a substantially hourglass shape may be comprised. By integrating the upper layer side core wrap sheet 16 and the lower layer side core wrap sheet 17 with the slit 18, the core 13 is pulled by the core wrap sheets 16 and 17, and the absorber 13 around the slit 18 has a certain height. Since it cannot bulge as described above, the amount of body fluid absorbed by the absorbent body 13 may be reduced, and the body fluid absorbed by the absorbent body 13 may be easily returned. In order to solve this problem, when the embossed area is reduced over the entire slit 18 (when the width of the application region of the pin-shaped emboss 21 is reduced), the shape of the slit 18 is maintained and the bonding strength between the core wrap sheets 16 and 17 is increased. It will have an adverse effect. Therefore, by adopting the above-mentioned substantially hourglass-shaped emboss pattern, it is possible to ensure expansion of the peripheral absorbent body 13 when wet in the central portion of the slit 18 while maintaining the slit shape at both ends of the slit 18. Yes.

  In such a substantially hourglass-shaped emboss pattern, the outline formed when the pin-shaped embosses 21 on both sides in the width direction are connected along the slit 18 has a curved shape that bulges toward the center in the width direction of the slit 18. It is preferable to do so. As a result, the width of the embossing area changes gradually. If a portion in which the width of the embossing region is suddenly reduced is provided, there is a risk that the pulp or polymer of the absorbent body 13 may enter the slit 18, and when the wet polymer expands, a load is applied to that portion. There is a possibility that the core wrap sheets 16 and 17 are disconnected from each other in a concentrated manner.

  As shown in FIG. 11, urine diffusion when slits 18, 18 along the longitudinal direction are provided on both sides of the body fluid discharge part, and pin-like embosses 21 are applied to each slit 18 with a substantially hourglass-shaped emboss pattern. The range can be kept within a certain range in the central portion surrounded by embosses on both sides. For this reason, the embossing pattern of this example is effective when the amount of urination is relatively small.

  As another modification of the emboss pattern, as shown in FIG. 12, the application region of the pin-like emboss 21 can be formed gradually wider toward the center of the slit 18. Thereby, expansion | swelling of the absorber 13 at the time of moisture becomes difficult to be suppressed, maintaining a slit shape. As shown in FIG. 13, the urine diffusion range in this case is such that when the slits 18, 18 along the longitudinal direction are provided on both sides of the body fluid discharge part, the body fluid easily diffuses from the center part to the front side and the rear side. Thus, the body fluid can be absorbed in a wider range of the absorber 13.

  In addition, the embossing pattern formed gradually narrower or gradually widened toward the center part of the slit 18 can be similarly formed not only for the pin-like emboss 21 but also for the continuous squeeze-like emboss that squeezes the entire surface.

  DESCRIPTION OF SYMBOLS 1 ... Disposable paper diaper, 10 ... Absorbent main body, 11 ... Liquid-permeable top sheet, 12 ... Waterproof sheet, 13 ... Absorber, 14 ... Core wrap sheet, 15 ... Gathered nonwoven fabric, 16 ... Upper layer side core wrap sheet, 17 ... Lower layer side core wrap sheet, 18 ... slit, 19 ... nonwoven fabric sheet, 20 ... emboss, 21 ... pin-like emboss, 30 ... exterior sheet, 30A ... upper layer nonwoven fabric, 30B ... lower layer nonwoven fabric

Claims (10)

While the upper layer side and the lower layer side are coated with a core wrap sheet, an absorbent article including an absorbent body formed with a slit penetrating in the thickness direction along the longitudinal direction,
A nonwoven fabric sheet containing a heat-fusible fiber is disposed between the absorber in the region including the slit and the lower layer side core wrap sheet, and embossing the slit from the outer surface side of the upper layer side core wrap sheet. By applying, the said upper layer side core wrap sheet | seat and the said lower layer side core wrap sheet | seat are integrated in the said slit, The absorbent article characterized by the above-mentioned. The absorbent article according to claim 1, wherein the nonwoven fabric sheet is made of an air-through nonwoven fabric having a basis weight of 10 to 50 g / m ² and is disposed in a wider area than the slit.   The absorbent article according to any one of claims 1 and 2, wherein the nonwoven fabric sheet is made of short fibers having a fiber length of 5 to 100 mm.   The absorbent article according to any one of claims 1 to 3, wherein a plurality of the slits are provided apart from each other in the width direction of the absorbent article, and the nonwoven fabric sheet is continuously disposed in a region including all of the slits. .   The absorbent article according to claim 1, wherein the core wrap sheet is made of crepe paper.   The absorbent article in any one of Claims 1-5 by which the liquid-permeable top sheet is arrange | positioned at the upper layer side of the said absorber, and the said embossing is given from the outer surface side of the said liquid-permeable top sheet.   A liquid-permeable top sheet is disposed on the upper layer side of the absorbent body, an intermediate sheet is disposed between the liquid-permeable top sheet and the absorbent body, and the embossing is an outer surface side of the liquid-permeable top sheet or The absorbent article in any one of Claims 1-5 given from the outer surface side of the said intermediate sheet.   The absorbent article according to any one of claims 1 to 7, wherein the emboss comprises a plurality of pin-like embosses or dot-like embosses.   The absorbent article according to claim 8, wherein three or more pin-like embossments or dot-like embossments are not arranged at equal intervals along the slit.   The absorbent article according to any one of claims 1 to 9, wherein the emboss is formed so as to be gradually narrower or gradually wider toward a central portion of the slit.

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