JP2010051654A - Absorptive article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide an absorptive article which can be thinned in thickness, is worn to give little sense of incompatibility, and is excellent in absorptive performance for a body fluid and fittability. <P>SOLUTION: The absorptive structure 4 interposed between a surface sheet 2 and a back sheet 3 includes an upper layer absorptive part 42 and a lower layer absorptive part 44 in the order from the surface sheet 2, wherein the upper layer absorptive part 42 contains fluff pulp and is provided with grooves 5, 5 formed to extend toward the longitudinal direction on a skin attachment surface 42a; the lower layer absorptive part 44 comprises two sheet materials 45, 46 opposite to each other and an absorptive resin powder 47 interposed between them; and the two sheet materials 45, 46 have a plurality of connection parts 48 which connect to each other without interposing the absorptive resin powder 47. The plurality of the connection parts 48 extend toward the longitudinal direction and are arranged in parallel toward the lateral direction at predetermined intervals, and are disposed to both the edges 44s, 44s of the lower layer absorptive part 44. In the plan view of the crotch A, the groove 5 overlaps the connection parts 48. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an absorbent article such as a urine collection pad, a light incontinence liner, a disposable diaper for adults or infants.

  The absorbent article usually incorporates an absorbent that absorbs body fluid such as urine, and pulp fibers are widely used together with water absorbent resin powder as a material for forming the absorbent. In recent years, studies have been made on an absorbent body in which the amount of pulp fiber used is reduced as much as possible.

  For example, in Patent Documents 1 and 2, a disposable absorbent having an absorbent mat having a sheet-like water-absorbing layer not containing pulp fibers and a fiber aggregate layer containing water-absorbent resin powder and pulp fibers in this order from the top sheet side. The article is listed.

  However, in the absorbent articles described in Patent Documents 1 and 2, when the content of the water-absorbent resin powder in the sheet-like water-absorbing layer is increased for the purpose of reducing the thickness of the absorbent mat, a large amount of urine is excreted at a time. If this is done, this may not be absorbed quickly. That is, in the absorbent articles described in Patent Documents 1 and 2, even if the sheet-like water absorption layer can reduce liquid return (a phenomenon in which the liquid once absorbed by the absorber returns to the top sheet). There is a risk that a part will leak before the whole amount of excretory fluid is absorbed. Moreover, in the absorbent article of patent document 1 and 2, since a sheet-like water absorption layer is located directly under a surface sheet, when content of the water absorbing resin powder in a sheet-like water absorption layer is increased, a wearer There is a possibility that it feels rough, and there is room for improvement in terms of softness and comfort.

  Patent Document 3 describes a disposable diaper that includes an absorbent layer formed by forming cotton-like pulp into a layer, and grooves on the front and back surfaces of the absorbent layer are formed along the longitudinal direction. According to the disposable diaper described in Patent Document 3, the diffusibility of excretory fluid in the longitudinal direction of the absorbent article and the fit of the crotch are improved.

  However, [0022] of Patent Document 3 describes that the lower limit of the thickness of the absorbent layer formed by forming the cotton-like pulp into a layer is 5 mm from the viewpoint of preventing the absorption capacity from being lowered. Even if the absorber having the configuration is employed, it is difficult to achieve both thinning and absorption performance.

JP 2004-275225 A JP 2005-253851 A JP 2005-34652 A

  Accordingly, an object of the present invention is to provide an absorbent article that can be thinned, has little discomfort when worn, and has excellent body fluid absorption performance and fit.

  The present invention is a vertically long absorbent article in which an absorbent structure is interposed between a top sheet and a back sheet, and the absorbent structure includes an upper layer absorbent part and a lower layer absorbent part in order from the top sheet side. The upper layer absorbent portion is configured to include fluff pulp, the skin contact surface of the upper layer absorbent portion is formed with a groove extending in the longitudinal direction of the absorbent article, and the lower layer absorbent portion is relatively Two sheets facing each other and a water-absorbing resin interposed between the two sheet materials, and a plurality of joint portions in which both sheet materials are joined to each other without the water-absorbing resin interposed A plurality of the joint portions extending in the longitudinal direction and arranged in parallel at a predetermined interval in the width direction of the absorbent article perpendicular to the longitudinal direction, and the longitudinal direction of the lower layer absorbent portion The joints are arranged on both side edges along the direction. Are, by providing an absorbent article are overlapped with the groove in plan view with the joint portion in the crotch portion located crotch of the wearer when worn, it is obtained by achieving the above object.

  The absorbent article of the present invention can be thinned, has little uncomfortable feeling when worn, and has excellent body fluid absorption performance and fit.

  Hereinafter, the absorptive article of the present invention is explained based on the desirable embodiment with reference to drawings. FIG. 1 shows a urine collection pad as a first embodiment of the present invention. 2 is a schematic diagram of a cross section taken along line XX in FIG. 1, and FIG. 3 is a schematic diagram of a cross section taken along line YY in FIG. The urine collection pad 1 of the first embodiment is formed substantially vertically and includes a liquid-permeable top sheet 2 and a liquid-impermeable or water-repellent and moisture-permeable back sheet 3, both sheets. The absorption structure 4 is interposed between the two and three. The absorbent structure 4 is formed substantially vertically long, and its longitudinal direction coincides with the longitudinal direction of the urine collecting pad 1 (pad longitudinal direction, vertical direction in FIG. 1), so that it is substantially at the center of the pad 1. It is arranged in the department.

  The urine collecting pad 1 has a crotch part A at the center in the longitudinal direction, and has a ventral part B and a dorsal part C extending from the crotch part A in the longitudinal direction. The crotch part A is a part located on the wearer's crotch when the pad 1 is worn, the ventral part B is a part located on the wearer's belly side, and the back part C is a part located on the wearer's back side. The ventral side B and the dorsal side C do not have to be strictly in contact with the wearer's abdomen and back. C means the site | part located in a back side direction, respectively. The urine collecting pad 1 has an hourglass shape (iron array) in which both side edges of the crotch part A are curved in an arc shape and a central portion in the longitudinal direction is bound inward in a plan view. Due to the presence of the constricted portions on both side edges of the crotch part A, the fit to the wearer's legs is mainly improved.

  The absorbent structure 4 includes an upper layer absorbent portion 42 and a lower layer absorbent portion 44 in order from the topsheet 2 side. More specifically, the absorbent structure 4 includes an upper mount 41 and an upper layer absorbent portion 42 arranged between the topsheet 2 and the upper layer absorbent portion 42 in addition to the upper layer absorbent portion 42 and the lower layer absorbent portion 44. The lower mount 43 is arranged between the lower absorbent section 44 and the upper mount 41, the upper absorbent section 42, the lower mount 43, and the lower absorbent section 44 in this order from the top sheet 2 side. . Both the upper mount 41 and the lower mount 43 have a rectangular shape in plan view, and the sizes of both are substantially the same. The constituent members (layers) 41 to 44 of the absorbent structure 4 are bonded to each other to the extent that the absorbent structure 4 is not hindered from the viewpoint of preventing twisting or breakage of the absorbent structure 4 while the pad 1 is worn. Is preferred, but not all layers need to be joined.

  The upper layer absorbing portion 42 is configured to include fluff pulp (opened pulp). As shown in FIGS. 1 and 4, the upper layer absorbing portion 42 has an hourglass shape (iron array) in which both side edges of the crotch portion A are trapezoidal and the central portion in the longitudinal direction is inward in plan view. It has a shape. As shown in FIGS. 1 and 4, the upper layer absorbing portion 42 (absorbing structure 4) is cut out at all four corners when viewed in plan, thereby the upper layer absorbing portion 42 (absorbing structure 4). At both ends in the longitudinal direction, the central portion in the width direction protrudes outward from both side portions. In general, the four corners of absorbent articles, such as urine pads, are easy to break, so by adopting an absorbent structure with a flat shape with the four corners cut off, it is possible to effectively prevent such corners from being folded. Is done.

  A plurality (two in the first embodiment) of groove portions 5 extending in the pad longitudinal direction are formed on the skin contact surface 42a of the upper layer absorbing portion 42. The plurality of grooves 5 and 5 are formed near the center of the crotch A in the width direction, and are arranged in parallel at a predetermined interval in the width direction of the pad 1 (pad width direction, left-right direction in FIG. 1). Yes. Each groove portion 5 is formed over substantially the entire length of the crotch portion A in the pad longitudinal direction.

  In the present specification, the “longitudinal direction” is a direction along the long side of the absorbent article or various members constituting the absorbent article, and the “width direction” is a direction orthogonal to the longitudinal direction. Further, the “skin contact surface” is a surface directed to the skin side of the wearer when wearing the absorbent article in the absorbent article or various members constituting the absorbent article, and the “non-skin contact surface” It is a surface directed to the underwear side (opposite to the wearer's skin side) when the absorbent article is worn in the absorbent article or various members constituting the absorbent article.

  As shown in FIG. 2, the top sheet 2, the upper mount 41, the upper layer absorbent portion 42, the lower mount 43, and the lower layer absorbent portion 44 are consolidated in the groove portion 5. That is, the groove part 5 in 1st Embodiment is a recessed part formed by pushing the surface sheet 2 concavely to the lower layer absorption part 44, and each member from the surface sheet 2 to the lower layer absorption part 44 is joined in the groove part 5, and is integrated. It has become. As shown in FIG. 1, the groove portion 5 is a circle in which a large number of concave portions 51 having a rectangular shape in plan view are continuously formed in the longitudinal direction of the pad, and are curved convexly toward the inside of the pad 1 as a whole. It is made arcuate. The groove 5 can be formed by known embossing.

  The length L (see FIG. 1) along the pad longitudinal direction of the groove portion 5 is (length L / along the pad longitudinal direction of the upper layer absorbent portion) with respect to the length along the pad longitudinal direction of the upper layer absorbent portion 44. The length) is preferably in the range of 1/10 to 6/10, and more preferably in the range of 1/5 to 1/2. Moreover, the length L of the groove part 5 becomes like this. Preferably it is 40-360 mm, More preferably, it is 80-260 mm. Moreover, the length (width) W (refer FIG. 1) along the pad width direction of the groove part 5 becomes like this. Preferably it is 2-20 mm, More preferably, it is 3-15 mm. Moreover, the shortest separation distance (interval) T (refer FIG. 1) between the adjacent groove parts 5 and 5 becomes like this. Preferably it is 20-100 mm, More preferably, it is 30-80 mm.

  The lower layer absorbing portion 44 includes two sheet materials (first sheet material 45 and second sheet material 46) facing each other and a water absorbent resin powder 47 interposed between the sheet materials 45 and 46. ing. The lower layer absorber 44 is an absorber having a so-called pulpress structure that does not contain fluff pulp (the content of fluff pulp is 10% by weight or less with respect to the total weight of the lower layer absorber 44). The lower layer absorber 44 has a rectangular shape in plan view as shown in FIG. The first sheet material 45 forms a skin contact surface of the lower layer absorbent portion 44, and the second sheet material 46 forms a non-skin contact surface of the lower layer absorbent portion 44. The water-absorbent resin powder 47 is preferably a granular polymer particle that absorbs and swells body fluid such as urine (the powder surface has many irregularities), and the first sheet material 45 and the second sheet material 46 There are many in between. In addition, although it is preferable that the absorptive resin which concerns on this invention is a powder like 1st Embodiment, it is not limited to this, Forms, such as a fiber form, may be sufficient.

  The lower layer absorbent portion 44 includes a plurality of joint portions 48 in which the first sheet material 45 and the second sheet material 46 are joined to each other by a joining means such as an adhesive or heat seal without interposing the water absorbent resin powder 47 ( 5 in the first embodiment). As shown in FIG. 5, the plurality of joint portions 48 extend in the pad longitudinal direction (vertical direction in FIG. 5) and are arranged in parallel at a predetermined interval in the pad width direction (horizontal direction in FIG. 5). In addition, joint portions 48 are arranged on both side edge portions 44 s and 44 s along the longitudinal direction of the pad of the lower layer absorbing portion 44. Each of the plurality of joint portions 48 has a linear shape extending in the pad longitudinal direction in plan view, and extends over the entire length of the lower layer absorbent portion 44 in the pad longitudinal direction.

  The lower layer absorbent portion 44 has a plurality of (in the first embodiment, four rows) existence areas 49 of the water-absorbing resin powder 47 extending in the longitudinal direction of the pad, and the joining portions 48 and the existence areas 49 are arranged in the pad width direction. Alternatingly arranged. Each of the plurality of existence areas 49 has a linear shape extending in the longitudinal direction of the pad in plan view, and extends over the entire length of the lower layer absorbing portion 44. Adhesive is applied to the inner surface of at least one of the two sheet materials 45 and 46 in the existence area 49, so that the water absorbent resin powder 47 is firmly placed between the sheet materials 45 and 46 in the existence area 49. It is fixed and the movement of the water absorbent resin powder 47 before liquid absorption is effectively prevented. On the other hand, as described above, the joining portion 48 is formed by joining the first sheet material 45 and the second sheet material 46 to each other without the water absorbent resin powder 47 interposed therebetween, and substantially the water absorbent resin powder. 47 is a non-existing area that does not exist.

  As described above, in the lower layer absorbent portion 44 in the first embodiment, the linear joint portion 48 (the non-existence region of the water absorbent resin powder 47) extending over the entire length in the pad longitudinal direction and the existence region 49 include the pad width. The joint portions 48 are located at both side edge portions 44 s and 44 s that are alternately arranged in the direction and that extend along the longitudinal direction of the lower layer absorbent portion 44. There are five rows of joint portions 48 and four rows of existence areas 49. When the lower layer absorption part 44 having such a configuration absorbs body fluid and becomes wet, the existence area 49 expands due to liquid absorption / swelling of the water absorbent resin powder 47 existing therein, but the joining part 48. Is maintained in a state where the first sheet material 45 and the second sheet material 46 remain joined without expanding. Due to this expansion difference, in the wet state of the lower layer absorbent portion 44, the joint portion 48 becomes a groove extending in the longitudinal direction of the pad, and acts as a liquid conduit for excreted body fluid.

  Thus, the non-existing area (joining part 48) and the existing area 49 of the water-absorbing resin powder 47 extending in the pad longitudinal direction are alternately arranged in the pad width direction. The diffusibility is improved and the excreted bodily fluid is mainly transmitted through the joint portion 48 acting as a liquid guiding path and quickly moves in the longitudinal direction of the pad, so that the bodily fluid is diffused in the surface direction of the lower layer absorbent portion 44. While absorbing. Thereby, even if the water-absorbent resin powder 47 is contained in a large amount in the lower layer absorbent portion 44, the absorption of the water-absorbent resin powder 47 and the occurrence of gel blocking are effectively prevented. In general, the body fluid such as urine has a faster moving speed in the joint portion 48 where the water absorbent resin powder 47 does not exist than in the existence region 49 where the water absorbent resin powder 47 exists, and the improvement in liquid diffusibility is achieved by the joint portion. The place by 48 is big. Further, both side edge portions 44 s, 44 s of the lower layer absorbent portion 44 serve as a joint portion 48 between the first sheet material 45 and the second sheet material 46 constituting the outer surface of the lower layer absorbent portion 44, thereby making the water absorbent resin The falling off of the powder 47 from both side edges of the lower layer absorbent portion 44 is effectively prevented. In addition, the presence of the joint portion 48 between the adjacent existence regions 49 and 49 is effective not only in improving liquid diffusibility but also in preventing movement of the water absorbent resin powder 47 before liquid absorption.

  The width of each joint 48 (length in the pad width direction) is preferably 0.5 to 15 mm, more preferably 1 to 10 mm, and particularly preferably 3 from the viewpoint of ensuring the above-described effects. -10 mm. When the width of the joint portion 48 is within the above range, it is easy to sufficiently obtain both the effect of improving liquid diffusibility and good liquid absorption performance. From the same viewpoint, the width of each existence region 49 is preferably 10 to 50 mm, more preferably 15 to 35 mm, and particularly preferably 15 to 25 mm.

  Further, in the lower layer absorbent portion 44, the number of joint portions 48 other than the joint portions 48 located at both side edge portions 44s and 44s of the lower layer absorbent portion 44 (the joint portions 48 located inward of the both side edge portions 44s and 44s). The number is preferably 2 to 13 rows, more preferably 3 to 9 rows, although it depends on the size of the lower layer absorbing portion 44.

The basis weight of the water-absorbent resin powder 47 in each existence region 49 is preferably 150 to 400 g / m ² , more preferably 180 to 360 g / m, from the viewpoint of the balance between absorption performance, liquid permeability, and wearing feeling. ² , particularly preferably 210 to 360 g / m ² .

  The lower layer absorber 44 can be manufactured, for example, as follows. A belt-like second sheet material that is a precursor of the second sheet material 46 (a sheet that forms the non-skin contact surface of the lower layer absorbent portion 44) is continuously fed out, and an adhesive is applied to the entire surface of the second sheet material. Apply. Next, the water-absorbent resin powder 47 is continuously dispersed in a stripe shape along the flow direction of the second sheet material on the adhesive-coated surface of the second sheet material. Separately, a strip-shaped first sheet material that is a precursor of the first sheet material 45 is continuously fed out, and an adhesive is applied to the entire surface of the first sheet material. Then, the second sheet material and the first sheet material are overlapped so that the water-absorbing resin powder spraying surface of the second sheet material and the adhesive application surface of the first sheet material face each other to obtain a laminated sheet. Furthermore, the laminated sheet is passed through a pair of nip rolls and a pair of embossing rolls in order, subjected to pressure treatment or heat pressure treatment, and then cut into a predetermined size, thereby absorbing the desired lower layer. Part 44 is obtained.

  In manufacturing the lower layer absorbent portion 44, the adhesive can be applied using a known adhesive applying means such as a coater, slot spray, spiral spray or the like. The adhesive application surface of each of the first sheet material 45 and the second sheet material 46 has a portion where no adhesive is applied, from the viewpoint of preventing a decrease in liquid absorbency and air permeability caused by the adhesive. That is, it is preferable that the adhesive is not solid. That is, the adhesive layer formed by applying the adhesive to each of the first sheet material 45 and the second sheet material 46 is a linear (straight, spiral, etc.) or dotted adhesive in plan view. It is preferable to be composed of an aggregate.

  As the adhesive, a hot melt adhesive is preferably used. Examples of the hot melt adhesive include styrene and olefin. Styrene-based hot melt adhesives include styrene-butadiene-styrene copolymer (SBS), styrene-isoprene-styrene copolymer (SIS), and styrene-ethylene-butylene-styrene copolymer that is a hydrogenated product of SBS. (SEBS) and blended hot melt adhesives in which two or more of these are blended can be used. Among these, in particular, a blended hot melt adhesive of SIS and SBS, or a blended hot melt adhesive of SIS and SEBS is easy to balance the tack force and the cohesive force. Since it is easy to fix the powder 47 to both the sheet materials 45 and 46, it is preferably used in the present invention.

  In the first embodiment, as shown in FIGS. 2 and 4, the groove portion 5 and the joint portion 48 overlap each other in plan view at the crotch portion A. Here, “the groove portion and the joint portion overlap” means not only when the groove portion 5 entirely overlaps the joint portion 48 in plan view in the crotch part A, but also a part of the groove portion 5 is a joint portion. Including the case of overlapping with 48. When a part of the groove portion 5 overlaps with the joint portion 48, the overlapping portion may be continuous, or may be interrupted and discontinuous.

  In this way, at least a part of the groove 5 in plan view in the crotch part A overlaps with the joint 48 where the water absorbent resin powder 47 does not substantially exist, so that the pad as shown in FIG. At the time of wearing 1, the absorbent structure 4 located in the crotch part A is three-dimensionally deformed along the groove 5 (in FIG. 6, it is deformed into a W shape in a sectional view along the pad width direction). For this reason, the crotch part A can easily follow the shape of the wearer's crotch part, and as a result, good fit and leakage resistance can be obtained. If substantially all of the groove portion 5 located in the crotch part A overlaps with the existence region 49 instead of the joint portion 48, such three-dimensional deformation of the absorbent structure 4 is caused with the joint portion 48. Compared to the case where they overlap, the water-absorbent resin powder 47 in the existence region 49 is liable to be crushed and hardened, which may cause a decrease in absorption performance and an uncomfortable feeling when worn.

  From the viewpoint of making the effect of overlapping the groove portion 5 and the joint portion 48 even more certain, the ratio of the overlapping portion with the joint portion 48 in each groove portion 5 located in the crotch part A Is more preferable. More specifically, it is preferable that 50% or more of the total area of each groove portion 5 positioned in the crotch part A in a plan view overlaps with the joint portion 48, and 80 to 100% of the total area is the joint portion 48. It is further preferable that the groove portions 5 overlap each other, that is, the substantially entire groove portions 5 located in the crotch portion A overlap the joint portion 48. Further, the length of the overlapping portion between the groove portion 5 and the joint portion 48 along the pad longitudinal direction (when the overlapping portion is discontinuous, the total length thereof) is preferably 40 to 360 mm, and more preferably 40 to 360 mm. 260 mm.

  Incidentally, in the first embodiment, as described above, the first sheet material 45 and the second sheet material 46 are bonded with a bonding force of a certain level or more in all of the plurality of bonding portions 48, thereby absorbing the lower layer. Even if the part 44 absorbs a small amount of body fluid and becomes wet, the joined state is maintained. Instead of such a configuration, both side edges 44s and 44s of the lower layer absorbent part 44 are provided. At least a part of the joining portion 48 may be a sheet peeling region that is peeled off when the lower layer absorbing portion 44 is in a wet state by absorbing a large amount of body fluid. The sheet peeling area is the same as the joint 48 before use of the pad, but the water absorbent resin powder 47 existing in the existence area 49 swells by absorbing a large amount of body fluid such as urine, and the water absorbent resin powder 47 This is the region where the bonded first sheet material 45 and second sheet 46 are peeled off by the swelling force. Hereinafter, the form having the sheet peeling region is also referred to as a joint peeling form.

  Thus, by making at least a part of the joint portion 48 a sheet peeling region, the swelling inhibition of the water absorbent resin powder 47 is more effectively prevented, and a larger amount of body fluid can be absorbed. It is possible to improve the absorption performance.

  Which part of the lower layer absorbent portion 44 is used as the sheet peeling region can be appropriately set according to the use of the pad 1 or the like, but the sheet peeling region is located on both side edges 44 s and 44 s of the lower layer absorbent portion 44. Preferably it is not located. That is, in the joint peeling mode, the sheet materials 45 and 46 that are joined to each other in at least a part of the joint 48 that is disposed at portions other than the side edges 44s and 44s of the lower layer absorbent portion 44 absorb water. It is preferable that the resin powder 47 is peeled off by liquid absorption / swelling. By preventing both side edge portions 44s and 44s of the lower layer absorbent portion 44 from becoming a sheet peeling region, both side edge portions 44s and 44s when the water absorbent resin powder 47 existing in the existence region 49 absorbs body fluid such as urine. Therefore, it is possible to effectively avoid the risk that the water absorbent resin powder 47 falls off and leaks to the outside.

  Furthermore, it is preferable that the sheet peeling region is not located also in the joint portion 48 of the lower layer absorbing portion 44 that overlaps the groove portion 5. That is, since the joint portion 48 of the lower layer absorbent portion 44 located in the groove portion 5 is not peeled off due to liquid absorption / swelling of the water absorbent resin powder 47, the groove structure of the groove portion 5 is maintained even after wetting. This is because the diffusibility and fit of the liquid can be maintained. As a preferable embodiment in the case of forming the sheet peeling region, for example, there is a form in which the joint portion 48 other than the portions overlapping the side edge portions 44s and 44s and the groove portion 5 of the lower layer absorbent portion 44 is the sheet peeling region. Can be mentioned.

  When there are a plurality (two) of groove portions 5 as in the first embodiment, it is preferable that the sheet peeling region exists between the plurality of (two) groove portions 5 and 5 in the crotch part A. In FIG. 2, reference numeral 48P in parentheses indicates a preferred position of the sheet peeling area when the sheet peeling area is formed. When the sheet peeling area exists between the plurality of grooves 5 and 5 in the crotch part A, the sheet peeling area peels before the groove 5 when the water absorbent resin powder 47 absorbs body fluid such as urine. This is particularly effective in that the swelling force is reduced, the sheet 48 of the joint portion 48 that overlaps the groove portion 5 is prevented from being peeled and the groove portion 5 can be maintained, and the swelling inhibition of the water absorbent resin powder 47 can be suppressed. That is, it is preferable that the joining part 48 located between the groove parts 5 and 5 is a sheet | seat peeling area | region.

  As described above, a part of the joint portion 48 or almost all of the joints except the side edge portions 44 s and 44 s is used as the sheet peeling region, so that the joint between the first sheet material 45 and the second sheet material 46 is wet. This is done by controlling the strength. The joint strength when wet between the first sheet material 45 and the second sheet material 46 in the sheet peeling region is a joint strength that does not break both the sheets 45 and 46 when wet. From the viewpoint of suppressing the decrease in the drop-off prevention effect and the liquid diffusion effect, and the effect of preventing the swelling of the water-absorbent resin powder from being surely provided, as well as the sheet peeling region, it is preferably 40 to 150 cN / 25 mm, more preferably 55 to 125 cN / 25 mm, particularly preferably 60 to 100 cN / 25 mm.

  On the other hand, the bonding strength when wet between the first sheet material 45 and the second sheet material 46 at the bonding portion 48 that is not the sheet peeling region is such that it does not peel off due to liquid absorption / swelling of the water absorbent resin powder 47, or The joint strength is such that both sheets 45 and 46 are torn.

  The wet joint strength between the first sheet material 45 and the second sheet material 46 at the joint portion 48 that is not the sheet peel region is NE, and the first sheet material 45 and the second sheet material 46 in the sheet peel region are When the wet joint strength is E, the difference between the two bond strengths (NE-E) is preferably 40 cN / 25 mm or more, more preferably 50 cN / 25 mm or more, and particularly preferably 60 cN / 25 mm or more. When NE is 40 cN / 25 mm or more larger than E, the bonding between the first sheet material 45 and the second sheet material 46 in the sheet peeling region is not the sheet peeling region due to liquid absorption and swelling of the water absorbent resin powder 47. Since the sheet 48 is peeled off before the sheets 45 and 46 in the portion 48, the pressure in the existence area 49 is reduced, and the bonding state between the first sheet material 45 and the second sheet material 46 in the bonding portion 48 that is not the sheet peeling area is determined. Can be maintained. The wet joint strength between the first sheet material 45 and the second sheet material 46 is measured as follows.

(Measuring method of bonding strength when wet between the first sheet material 45 and the second sheet material 46)
The lower layer absorbent portion 44 is cut into a width of 25 mm × a length of 30 mm (a length in which the joint portion 48 is necessarily included) so as to cross the joint portion 48 of the lower layer absorbent portion 44 to be measured. In order to facilitate attachment, a sample is opened between the first sheet material 45 and the second sheet material 46 in the existence area 49 located at the end. This sample is attached between the chucks of the tensile tester so that the direction (CD direction) across the joint 48 is the tensile direction. Next, a saline solution is applied to the entire sample using a brush, and is sufficiently moistened. One minute after applying the physiological saline, the sample is pulled at a tensile speed of 300 mm / min, and the first sheet material 45 and the second sheet material 46 that have been bonded at the bonding portion 48 are peeled off. Measure. The measurement is performed 6 times, and the average value of these measurements is taken as the wet joint strength between the first sheet material 45 and the second sheet material 46.

  The magnitude of the wet joint strength between the first sheet material 45 and the second sheet material 46 at the joint 48 greatly depends on the joining means. When an adhesive is used as the joining means, the wet joint strength between the two sheet materials 45 and 46 can be adjusted by adjusting the type and amount of the adhesive. As a method of increasing the bonding strength when wet between the first sheet material 45 and the second sheet material 46, a method of using an adhesive having a strong adhesive strength, a method of increasing the coating amount of the adhesive, and bonding through an adhesive For example, a method of applying a pressure treatment or a heat pressure treatment to the applied portion of the adhesive between the first sheet material 45 and the second sheet material 46 using an emboss roll or the like can be given. One of these methods for improving the bonding strength may be used alone, or a plurality of methods may be used in combination. The joining of the first sheet material 45 and the second sheet material 46 in the joining portion 48 that is not the sheet peeling region is preferably performed using these joining strength improving methods.

  For example, in the joint portion 48 that is not the sheet peeling region, it is preferable that the amount of adhesive applied is 1.5 to 3 times the sheet peeling region. In this way, partially changing the amount of adhesive applied can be achieved by combining the method of adjusting the amount applied in the sheet width direction with an adhesive coating machine, or by combining an adhesive continuous application device and an intermittent pattern application device. It can be performed depending on the method used. Further, for example, a large amount of adhesive can be applied partially by using a known adhesive application device such as spiral spray or slot spray. Further, when an adhesive and an embossing roll are used in combination when forming the joint portion 48, the amount of adhesive applied to the joint portion 48 that is not the sheet peeling region is set to the same coating amount as the sheet peeling region, and the sheet peeling region is not The joining portion 48 is heated and pressed at a temperature lower by 5 to 10 ° C. than the melting point of the lower one of the first sheet material 45 and the second sheet material 46 using an embossing roll. It is preferable from the viewpoint of strength improvement and prevention of tearing. This is because when the heating temperature of the embossing roll is equal to or higher than the melting points of both sheets 45 and 46, the sheet material is melted, and holes and tears are likely to occur in the sheet material.

Next, each component of the absorbent structure 4 will be described. As the upper mount 41 and the lower mount 43, tissue paper, water absorbent paper, crepe paper, various hydrophilic nonwoven fabrics (for example, air-through nonwoven fabric, spunbond nonwoven fabric, spanned fabric) Bond-meltblown-spunbond (SMS) nonwoven fabric, spunlace nonwoven fabric) and the like can be used. The upper mount 41 and the lower mount 43 may be exactly the same or may have different compositions, sizes, and the like. Further, the upper mount 41 and / or the lower mount 43 may contain an antibacterial agent containing an extract of a natural product such as catechin in addition to a silver-based, copper-based, or zinc-based substance or salts thereof. In addition, a deodorant such as activated carbon, zeolite, or silica gel may be included. The basis weight of the upper mount 41 and the lower mount 43 is preferably 10 to 40 g / m ² , and more preferably 15 to 30 g / m ² , respectively.

Examples of fluff pulp used in the upper layer absorbent section 42 include softwood kraft pulp (NBKP), hardwood kraft pulp (LBKP), natural cellulose such as cotton, regenerated cellulose such as rayon and cupra, and the like, Two or more kinds can be used. As fluff pulp used for upper layer absorption part 42, the crosslinked pulp which bridge | crosslinked the molecule | numerator of the cellulose fiber and / or the molecule | numerator can also be used. The basis weight of the fluff pulp in the upper layer absorbent portion 42 is preferably 80 to 240 g / m ² , more preferably 80 to 180 g / m ² .

The upper layer absorbent portion 42 may be configured to include other components than fluff pulp, and may be configured to include fluff pulp and water absorbent resin powder, for example. As the water absorbent resin powder used for the upper layer absorbent portion 42, the same powder as that used for the lower layer absorbent portion 44 can be used. The basis weight of the water absorbent resin powder in the upper layer absorbent portion 42 is preferably 30 to 200 g / m ² , more preferably 40 to 160 g / m ² .

As the 1st sheet material 45 and the 2nd sheet material 46 which constitute the lower layer absorption part 44, a hydrophilic nonwoven fabric or paper is used preferably, respectively. Examples of the hydrophilic nonwoven fabric include air-through nonwoven fabric, point bond nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, and SMS nonwoven fabric. Examples of the paper include crepe paper and water absorbent paper. The first sheet material 45 and the second sheet material 46 may be exactly the same or may be different in composition, size, etc., but the first sheet material 45 and the second sheet material 46 form the non-skin contact surface of the lower layer absorbent portion 44. As the two-sheet material 46, a material having higher rigidity than the first sheet material 45 is preferable in order to reduce wrinkles due to the water absorbent resin powder 47. The basis weights of the first sheet material 45 and the second sheet material 46 are each preferably 15 to 80 g / m ² , more preferably 18 to 80% from the viewpoint of the wet strength of each sheet material and the flexibility of the absorbent structure 4. 70 g / m ^2, particularly preferably 18~60g / m ^2.

  As the water-absorbent resin powder (water-absorbent resin powder 47) used in the absorbent structure 4, the same ones that are normally used in this type of absorbent article can be used without particular limitation. Sodium acrylate, (acrylic acid-vinyl alcohol) copolymer, cross-linked poly (sodium acrylate), (starch-acrylic acid) graft polymer, (isobutylene-maleic anhydride) copolymer and saponified product thereof, polyacrylic acid Synthetic resin systems such as potassium and cesium polyacrylate; natural or biological substances such as starch, cellulose and derivatives thereof can be used. The shape of the water-absorbent resin powder is not particularly limited, and may be granular (the powder surface has many irregularities), spherical (particulate), fibrous, indefinite shape, or an aggregate thereof. Particularly preferred are agglomerated aggregates and irregularly shaped aggregates.

  The water-absorbing resin powder 47 used in the absorbent structure 4 has a water absorption rate by a vortex method (VORTEX method) of preferably 45 seconds or less, more preferably 8 to 40 seconds, still more preferably 8 to 35 seconds, particularly preferably. 12-30 seconds. The vortex method is known as a method for showing the ability to fix a liquid when the water absorbent resin powder 47 is forcibly exposed to the liquid. In particular, since the lower layer absorbent portion 44 is a thin absorber with a pal press structure, it is desirable that the absorption rate is high. However, the water absorption rate of the water absorbent resin powder 47 by the vortex method is within such a range, As a result, the absorption speed of the absorption structure 4 can be improved, and even if a large amount of urine is excreted at once, it can be quickly absorbed. For this reason, since liquid becomes easy to be absorbed into absorption structure 4 (lower layer absorption part 44) quickly, it becomes difficult to produce urine leakage, and it becomes easy to control that skin is wet extensively by spreading urine. Is. In addition, since the absorption rate of the water-absorbent resin powder 47 is not extremely high (that is, the water absorption rate by the vortex method is 8 seconds or more), when the urine is excreted repeatedly after being used for a long time, it is excreted. Since it becomes difficult to reach the saturated absorption amount in the vicinity of the urine part, urine can be absorbed in a wide range, so that leakage and liquid return can be effectively suppressed. In addition, in this invention, since the evaluation of the water absorption rate by a vortex method is evaluated by measuring time, it is considered that a water absorption rate is so quick that measurement time is short. The water absorption rate by the vortex method is measured as follows.

(Measurement method of water absorption rate by vortex method)
A 100 mL glass beaker with 50 mL of physiological saline (0.9 wt% sodium chloride water) and a magnetic stirrer chip (center diameter 8 mm, both ends diameter 7 mm, length 30 mm, surface coated with fluororesin ) And place the beaker on a magnetic stirrer (HPS-100 manufactured by ASONE). The rotational speed of the magnetic stirrer is adjusted to 600 ± 60 rpm, and the physiological saline is stirred. 2.0 g of the water-absorbent resin powder as a measurement sample was put into the liquid at the center of the vortex of the saline solution being stirred, and the water-absorbing rate (seconds) of the water-absorbent resin powder in accordance with JIS K 7224 (1996). ). Specifically, the stopwatch is started when the water-absorbing resin powder is completely charged into the beaker, and when the stirrer chip is covered with the test liquid (when the vortex disappears and the liquid surface becomes flat). Stop the stopwatch and record the time (in seconds) as the water absorption rate by vortex method. In the measurement, n = 5 was measured, the values at each of the upper and lower points were deleted, and the average value of the remaining three points was taken as the measured value. In addition, these measurements are performed at 23 ± 2 ° C. and humidity 50 ± 5%, and are measured after storing the water-absorbent resin powder in the same environment for 24 hours or more before the measurement.

  When the upper layer absorbent portion 42 includes the water absorbent resin powder 47, the water absorption speed A of the water absorbent resin powder 47 used for the upper layer absorbent portion 42 by the vortex method is the water absorbent resin powder 47 used for the lower layer absorbent portion 44. It is preferable that the water absorption speed B is slower than the water absorption speed B by the vortex method, and the difference (AB) between the water absorption speeds is 10 seconds or more, particularly 15 seconds or more. Thus, the lower layer absorption part 44 has a higher water absorption rate of the water absorbent resin powder 47 contained than the upper layer absorption part 42, so that excreted urine is more in the lower layer absorption part 44 than in the upper layer absorption part 42. Since a large amount can be absorbed and fixed, the absorption load of the upper layer absorbing portion 42 is reduced, and the repeated absorption performance can be maintained.

  In addition, when the upper layer absorbent portion 42 includes the water absorbent resin powder 47, the ratio of the water absorbent resin powder 47 content weight of the lower layer absorbent portion 44 to the water absorbent resin powder 47 content weight of the upper layer absorbent portion 42 (in the lower layer absorbent portion). The weight of the water-absorbent resin powder 47 / the weight of the water-absorbent resin powder 47 in the upper layer absorbent portion) is preferably 1.1 or more, particularly 1.6 or more, and particularly preferably 2 or more. Thus, the lower layer absorption part 44 increases the content of the water-absorbent resin powder 47 more than the upper layer absorption part 42, so that even after the excreted urine has accumulated once in the upper layer absorption part 42, Since it can be drawn into the lower layer absorbing portion 44 and absorbed, there is little liquid return and the skin contact surface can be kept clean.

  The urine collecting pad 1 of the first embodiment will be further described. As shown in FIG. 1, the top sheet 2 and the back sheet 3 extend outward from both front and rear end portions in the longitudinal direction of the absorbent structure 4. The front and rear end extending portions are joined to each other by a joining means such as an adhesive or heat seal, whereby end seal portions 6 and 6 are formed. The end seal portion 6 is effective for preventing leakage of the water absorbent resin powder 47 from the end portion in the pad longitudinal direction and improving the appearance of the pad 1. As shown in FIGS. 2 and 3, the back sheet 3 has side edge extending portions that extend outward from the left and right side edges of the top sheet 2 and the absorbent structure 4. The protruding portion is wound up on the skin contact surface of the upper mount 41 and joined to the non-skin contact surface of the sheet material 80 for forming a three-dimensional gather by a joining means such as an adhesive or heat seal. Such a configuration effectively prevents the water absorbent resin powder 47 from leaking out from the end in the pad width direction.

  As shown in FIG. 1, a non-skin contact member 7 for fixing the urine collecting pad 1 to a disposable diaper or the like is provided on the non-skin contact surface of the back sheet 3. In the form shown in the figure, a band-shaped displacement preventing member 7 is provided on the non-skin contact surface of the back sheet 3 in the vicinity of both ends in the longitudinal direction of the absorbent structure 4. As the misalignment stopping member 7, a conventional adhesive type or mechanical hook type misalignment stopping member can be used. The slip prevention member 7 may be covered and protected with a release sheet (not shown) when not in use. In addition, the urine collecting pad 1 may be provided with a mark such as printing indicating the front-rear direction of the pad 1 so that the front-rear direction of the pad 1 can be easily identified. Can be attached to the outer surface of the release sheet.

  The urine collecting pad 1 includes a three-dimensional gather that can rise above the widthwise side edge of the absorbent structure 4. That is, as shown in FIGS. 1 to 3, a sheet material 80 for forming a three-dimensional gather having an elastic member 8 is arranged along the length of the pad in each of the left and right sides of the pad 1 in the longitudinal direction. Is formed. As shown in FIG. 2, in the crotch part A, one side edge side of the sheet material 80 for forming a three-dimensional gather is a free end edge that is not joined to another member, and an elastic member is formed on the one side edge. One or a plurality (two in the first embodiment) 8 is fixed in an expanded state, and the other side edge side of the sheet material 80 is on the skin contact surface of the top sheet 2 and the back surface rolled up. The side edge extension portion of the sheet 3 is joined, and the joint portion 81 serves as a rising base end portion 83 of the three-dimensional gather. That is, the top sheet 2 and the sheet material 80 are joined and integrated. On the other hand, as shown in FIG. 3, in the vicinity of the end in the pad longitudinal direction of the ventral side B, the entire sheet material 80 extends on the skin contact surface of the top sheet 2 and the side edge extension of the back sheet 3 rolled up. It is joined to the projecting part, and standing of the three-dimensional gather is prevented. Although not shown, the sheet material 80 is joined to the back side portion C in the same manner as the ventral side portion B. Due to such a joining form of the sheet material 80, the overall shape in the longitudinal direction in the natural state of the pad 1 becomes a concave curve (hull shape) on the skin contact surface side.

  As shown in FIG. 2, the sheet material 80 for forming a three-dimensional gather is folded back on the skin contact surface of the pad 1 in the crotch part A (having a folded portion), and a cross section in the pad width direction. It is Z-shaped in view. That is, the sheet material 80 in the crotch part A has a non-bonded portion (a portion other than the other side edge side) that is not bonded to the skin contact surface of the pad 1 in the sheet material 80 substantially parallel to the pad longitudinal direction. A first folded portion 81 that is formed by folding outward from the pad 1 at the first folding line L1 and the pad 1 at the second folding line L2 that is substantially parallel to the longitudinal direction of the pad 1 And a second folded portion 82 formed by folding inwardly. Thus, since the sheet material 80 for forming a three-dimensional gather in the crotch part A has the folded portions 81 and 82, the height of the three-dimensional gather can be further increased as compared with the case where such a folded portion does not exist. It can be kept high and the leak-proof property is further improved. Note that the sheet material 80 for forming a three-dimensional gather shown in FIG. 2 is folded back on the skin contact surface of the pad 1, and the leakage resistance is further enhanced by overlapping two sheets up to the rising position of the top sheet 2. Although it has a structure, it may have a length folded back to cover the elastic member 8.

Next, the details of the constituent members of the urine collecting pad 1 of the first embodiment will be described. As the surface sheet 2, various kinds of conventionally used urine collecting pads can be used. If it can permeate | transmit this liquid, there will be no restriction | limiting, For example, the woven fabric and nonwoven fabric which consist of a synthetic fiber or a natural fiber, a porous sheet etc. are mentioned. An example of the surface sheet 2 is a hydrophilic nonwoven fabric. As the hydrophilic non-woven fabric, a thermal bond non-woven fabric, a spun bond non-woven fabric, an SMS non-woven fabric or the like that has been subjected to a hydrophilic treatment can be used. The basis weight of the surface sheet 2 is preferably 10 to 40 g / m ² , more preferably 16 to 30 g / m ² .

As the back sheet 3, various types conventionally used in this type of urine collecting pad can be used, and liquid-impermeable or water-repellent and moisture-permeable ones are preferably used. As the back sheet 3, for example, a non-moisture permeable film or a moisture permeable film made of resin such as polyethylene; a composite sheet obtained by laminating the moisture permeable film and a nonwoven fabric can be used. In the composite sheet, the nonwoven fabric forms the non-skin contact surface of the pad. Further, the width of the back sheet 3 is set to be approximately the same as the width of the absorbent structure 4 (about 0 to 30 mm larger than the width of the absorbent structure 4), and is disposed on the non-skin contact surface side of the absorbent structure 4. A non-woven fabric larger than the width of the back sheet 3 may be provided on the non-skin contact surface side of the back sheet 3 as a sheet constituting the outer shape of the urine collecting pad. The basis weight of the back sheet 3 is preferably 16 to 60 g / m ² , more preferably 18 to 45 g / m ² .

As the sheet material 80 for forming a three-dimensional gather, a liquid-impermeable or water-repellent and moisture-permeable material is preferably used. Examples of the sheet material 80 include a liquid-impermeable or water-repellent nonwoven fabric, or a laminate of the porous resin film and the nonwoven fabric. Examples of the nonwoven fabric include thermal bond nonwoven fabric, spunbond nonwoven fabric, SMS nonwoven fabric, spunbond-meltblown-meltblown-spunbond (SMMS) nonwoven fabric, and the like. The basis weight of the sheet material 80 is preferably 8 to 30 g / m ² , more preferably 10 to 25 g / m ² . As the elastic member 8, various members conventionally used in this kind of urine collecting pad can be used.

  The thickness of the urine collecting pad 1 of the first embodiment under a pressure of 0.25 kPa in the central region is preferably 5 mm or less, more preferably 1.5 to 4 mm. The central region is a central portion of the pad 1 expanded in a planar shape as shown in FIG. 1 when divided into approximately three equal parts in the longitudinal direction, and substantially coincides with the crotch portion A. When the thickness in the central region of the urine collecting pad 1 is 5 mm or less, the feeling of stiffness when worn is reduced, and there is no sense of incongruity. The thickness of 5 mm or less in the central region of the urine collecting pad 1 can be achieved by employing the above-described absorption structure 4.

  The urine collection pad 1 of the first embodiment is used in a manner overlapping with a disposable diaper or other auxiliary absorbent article, in the same manner as a normal urine collection pad. The urine collecting pad 1 of the first embodiment is excellent in the leakage preventing effect mainly by the action of the absorption structure 4, and is excellent in the smooth feeling of the skin contact surface even after urination. That is, the absorption structure 4 can quickly absorb the body fluid such as excreted urine by the upper layer absorption part 42 and can be fixed by the lower layer absorption part 44, and thus has excellent body fluid absorption performance as a whole. In particular, the upper layer absorbing portion 42 mainly functions as fluff pulp that has a faster body fluid absorption rate and better water retention than the water absorbent resin powder 47, and thus functions as a temporary stock region for body fluid. On the other hand, since the lower layer absorbent portion 44 is a Palpress absorbent body mainly composed of the water absorbent resin powder 47, it has excellent liquid absorption and can absorb and fix the body fluid held in the upper layer absorbent portion 42. Is effective to suppress the so-called liquid return (a phenomenon in which the liquid absorbed by the absorber oozes again onto the skin contact surface of the absorber). it can. Further, in the lower layer absorbent portion 44, the joint portions 48 extending in the pad longitudinal direction and the existence regions 49 of the water absorbent resin powder 47 are alternately arranged in the pad width direction, so The body fluid that has reached the skin contact surface of the absorbing portion 44 is absorbed by the water absorbent resin powder 47 in the existence region 49 while being diffused in the surface direction of the lower layer absorbing portion 44 through the joint portion 48. Since the lower layer absorption part 44 has such an absorption system, even if a large amount of the water-absorbent resin powder 47 is contained, it is difficult to cause absorption inhibition or gel blocking, and has excellent body fluid absorption performance.

  Moreover, since the urine absorption pad 1 of 1st Embodiment is equipped with the absorption structure 4 provided with the lower layer absorption part 44 of what is called a pal press structure as an absorber, compared with a conventional product, thickness is thin and wears it. There is little discomfort at the time, and it is convenient for carrying and storage. Further, the groove portion 5 and the joint portion 48 of the lower layer absorbent portion 44 overlap each other when viewed in plan in the crotch portion A, so that the shape of the wearer's crotch portion matches the wearer's body shape as shown in FIG. It is easy to deform and has excellent fit.

  Hereinafter, other embodiments of the present invention will be described. In other embodiments described later, components that are different from the urine collection pad 1 of the first embodiment described above will be mainly described, and similar components will be denoted by the same reference numerals and description thereof will be omitted. The description of the urine collecting pad 1 of the first embodiment is appropriately applied to components that are not particularly described.

  FIG. 7 is a diagram showing a second embodiment of the present invention. The urine collecting pad 1 of the second embodiment is configured in the same manner as in the first embodiment except that the constituent members from the top sheet 2 to the back sheet 3 are consolidated in the groove portion 5. That is, the groove part 5 in the second embodiment is formed by pressing the top sheet 2 into the back sheet 3 in a concave shape, and each member from the top sheet 2 to the back sheet 3 is joined and integrated in the groove part 5. . According to the second embodiment, the same effect as that of the first embodiment is obtained. In the second embodiment, when the back sheet 3 is composed of a composite sheet obtained by laminating a resin film (moisture permeable film) and a non-woven fabric, and the resin film forms the absorber contact surface of the pad, The pinhole resistance (prevention of hole opening) of the back sheet 3 in the consolidation treatment is improved, and since the nonwoven fabric is on the outside, the touch is good and the stuffiness can be reduced by moisture permeability, which is particularly effective.

  FIG. 8 is a diagram showing a third embodiment of the present invention. The urine collection pad 1 of the third embodiment is different from the first embodiment in the number and shape of the grooves 5. In the skin contact surface of the upper layer absorbent portion 42 in the third embodiment, one linear groove portion 5 extending in the pad longitudinal direction is formed. The linear groove portion 5 is formed at substantially the center in the width direction of the crotch portion A over substantially the entire length of the crotch portion A in the pad longitudinal direction.

  In the present invention, the number of the groove portions 5 is not particularly limited, but about 1 to 3 is preferable. When the number of groove portions is three, for example, one linear groove portion extending in the pad longitudinal direction is formed at the approximate center in the width direction of the crotch part A, and is orthogonal to the length direction of the linear groove portion. One groove portion extending in the longitudinal direction of the pad can be formed on each of the left and right sides of the direction with a predetermined distance from the linear groove portion. In this case, the groove portions located on the left and right sides of the linear groove portion are in a symmetrical position via the linear groove portion. Further, the groove portions positioned on the left and right of the linear groove portion may be arc shapes like the groove portions 5 in the first embodiment, respectively, or may be linear shapes.

  Also in the third embodiment in which the number of the groove portions 5 is one, a part of the plurality of joint portions 48 can be used as the sheet peeling region. In this case, one of the joints (joint indicated by reference numeral 48P in FIG. 8) adjacent to the joint 48 (joint located at the approximate center in the width direction of the crotch part A) overlapping with the single groove 5 is provided. It is preferable that the part or the whole is a sheet peeling area. When a part of the joining portion 48P is used as the sheet peeling region, it is preferable that a portion along one groove portion 5 in the joining portion 48P is the sheet peeling region. According to the third embodiment, the same effect as that of the first embodiment is achieved.

  9 and 10 are diagrams showing a fourth embodiment of the present invention. The urine absorbing pad 1 of the fourth embodiment is a point in which the groove portion 5 is formed by a hole penetrating the upper layer absorbing portion 42 in the thickness direction, and the groove portion 5 is formed by a concave portion formed by pushing the top sheet 2 downwardly into a concave shape. Different from one embodiment. Moreover, the groove part 5 of 4th Embodiment also differs from 1st Embodiment in which a groove part is circular arc shape also in the point which becomes the linear form extended in a pad longitudinal direction, as shown in FIG. In 4th Embodiment, since the groove part 5 consists of a hole formed without using press processes like embossing, each member 41- 1 which comprises the absorption structure 4 in this groove part 5 like 1st Embodiment. 44 is not consolidated.

  The upper layer absorbent portion having such a groove portion is obtained by, for example, a pattern stacking method. In the pattern fiber-laying method, when the material for forming the upper layer absorbing portion such as fluff pulp is stacked on the plate, the formed material is spread on the predetermined portion by providing a convex portion on the predetermined portion of the plate. This is prevented, thereby forming a hole in the predetermined portion. Alternatively, an upper layer absorbent portion precursor without a hole may be prepared, and a predetermined portion of the upper layer absorbent portion precursor may be cut out to form a groove portion formed of a hole. According to the fourth embodiment, the same effect as that of the first embodiment is achieved.

  Incidentally, the shape of the groove portion 5 made of a hole in a cross-sectional view along the pad width direction is not limited to the rectangular shape as shown in FIG. 9, and for example, as shown in FIG. 11, the skin contact surface 42 a of the upper layer absorbent portion 42. A trapezoidal shape in which the width (the length along the pad width direction of the groove portion 5) gradually decreases from the surface toward the non-skin contact surface 42b.

  FIG. 12 is a diagram showing a fifth embodiment of the present invention. The urine absorbing pad 1 according to the fifth embodiment is such that the side edges of the crotch part A are linear and substantially parallel to the longitudinal direction of the pad, and the side edges are curved in an arc shape to form a constricted portion. Different from one embodiment. Further, a pair of left and right elastic members 9 for forming leg gathers (one in the fifth embodiment) are arranged on both sides in the longitudinal direction of the urine collection pad 1 of the fifth embodiment. Leg gathers are formed. The elastic members 9 for forming leg gathers are arranged substantially linearly in an extended state on the outer sides of both side edges in the longitudinal direction of the absorbent structure 4 in the crotch part A. According to the fifth embodiment, the same effect as that of the first embodiment is obtained.

  As mentioned above, although this invention was demonstrated based on the preferable embodiment, this invention is not restrict | limited to the said embodiment. For example, the groove part 5 (including both the groove part made of a recess and the groove part made of a hole) is not limited to an arc shape or a straight line shape as in the above-described embodiment, and is circular, elliptical, or the shape shown in FIG. A closed shape such as a configuration in which three portions 5a, 5b, 5c that are convexly curved outward in the width direction are connected in the longitudinal direction of the pad may be used. In addition, all the portions of only the one embodiment described above can be used as appropriate.

  In addition, the absorbent article of the present invention can be applied to other than the above-described urine pad, for example, a deployable or pant-type disposable diaper, a sanitary napkin, a panty liner, an incontinence liner, and the like.

  EXAMPLES Hereinafter, the present invention will be described more specifically with reference to examples, but the present invention is not limited to such examples.

[Example 1]
A urine collecting pad 1 shown in FIGS. 1 to 3 was prepared and used as a sample of Example 1. The urine collecting pad 1 of Example 1 has an hourglass shape with a width of 150 mm and a length of 370 mm. A hydrophilic air-through nonwoven fabric (basis weight 20 g / m ² ) is used as the top sheet 2, and a composite sheet (basis weight 36 g / m ² ) obtained by bonding the nonwoven fabric and the moisture-permeable film is used as the back sheet 3. A water-repellent SMS nonwoven fabric (basis weight 15 g / m ² ) was used as the sheet material 80 for gather formation, and thread rubber (two on each of the left and right sides) was used as the elastic member 8. The absorption structure 4 was produced as follows.

(Production of absorption structure)
Silver substituted Kang chestnut antimicrobial paper including a night-like mineral (basis weight 16g / m ^2, width 95mm × length 310 mm) using a paper (basis weight 16g / m ² as the lower base sheet 43 as the upper mount 41, the width 95mm X length 310 mm) was used. As the upper layer absorbent portion 42, a mixed fiber was used in which fluff pulp (basis weight 100 g / m ² ) and water absorbent resin powder (basis weight 50 g / m ² ) having a water absorption rate of 16 seconds by vortex method were mixed. The lower layer absorption part 44 was produced as follows. As shown in FIG. 5, the manufactured lower layer absorbent portion 44 has five rows of water absorbent resin powder non-existing areas (joint portions 48) and four rows of water absorbent resin powder existing regions 49, and the joints. The absorbent body had a pulpress structure in which the portions 48 and the existence regions 49 were alternately arranged in the width direction. In this absorbent body of the pulpress structure, each existence region 49 has a width of 15 mm × a length of 310 mm and a basis weight of the water-absorbent resin powder of 300 g / m ^2, and the width of each joint portion 48 is the both side edges of the absorber. The two rows positioned at 44s and 44s were each 7.5 mm, and the other three rows were 5 mm. The absorbent body of this pulpress structure is a joint portion excluding both side edges 44s and 44s of the absorbent body before being incorporated into the urine collecting pad (before embossing for forming the groove 5 is performed). All of 48 became the sheet peeling region (a region in which the two sheet materials bonded to each other were peeled off by liquid absorption and swelling of the water absorbent resin powder).

(Preparation of lower layer absorption part)
A hot melt adhesive (basis weight 3 g / m ² ) is sprayed on the hydrophilic air-through nonwoven fabric (basis weight 20 g / m ² ) as the first sheet material 45 by slot spray, and the vortex is applied on the adhesive spray surface. The water-absorbing resin powder 43 having a water absorption rate of 16 seconds according to the method was sprayed in stripes extending in the longitudinal direction of the sheet. The place where the water absorbent resin powder 43 is dispersed finally becomes the existence area 44 of the water absorbent resin powder 43. Separately, a hot-melt adhesive (basis weight 7 g / m ² ) is sprayed on the hydrophilic spunlace nonwoven fabric (basis weight 35 g / m ² ) as the second sheet material 46 by spiral spray, and this is used as a water absorbent resin powder. 43 was placed on the spreading surface of the first sheet material 45, and nipped with a nip roll to be integrated. Furthermore, the sheet non-peeling region in the joint portion 48 of the water absorbent resin powder 43 is sufficiently bonded between the first sheet material 45 and the second sheet material 46 by performing a heat and pressure treatment by hot pressing, Both sheets 41 and 42 in the sheet non-peeling region were prevented from being peeled off due to liquid absorption and swelling of the water absorbent resin powder 43. And this absorbent sheet was turned upside down. Thus, an absorbent sheet 4 as shown in FIG. 5 was produced.

  The shape of the groove portion 5 in the urine collecting pad 1 of Example 1 is as shown in FIGS. 1 and 2, and the groove portion 5 heats the surface sheet 2 to the absorbent structure 4 at a predetermined portion shown in FIG. It was formed by embossing from the top sheet 2 side at a temperature of 120 ° C. The length L (see FIG. 1) of the groove 5 was 150 mm, the width W (see FIG. 1) was 3 mm, and the interval T (see FIG. 1) between the adjacent grooves 5 and 5 was 37 mm. By this embossing, the joint portion 48 of the lower layer absorbing portion 44 that overlaps the groove portion 5 is no longer the sheet peeling region. That is, in the lower layer absorbent portion 44 in the urine collecting pad 1 of the first embodiment, the joint portion 48 other than the portions overlapping the side edge portions 44s and 44s and the groove portion 5 is a sheet peeling region.

[Examples 2 and 3]
In Example 1, except that the basis weights of the fluff pulp and the water-absorbent resin powder constituting the upper-layer absorbent part 42 were changed, urine collecting pads were produced in the same manner as in Example 1, and these were used as the samples of Examples 2 and 3. It was. In Example 2, the basis weight of fluff pulp was 100 g / m ² , and the basis weight of water absorbent resin powder was 100 g / m ^{2. In} Example 3, the basis weight of fluff pulp was 125 g / m ² , and the basis weight of water absorbent resin powder was 100 g / m ² . It was m ^2.

Example 4
In Example 1, a urine collection pad was prepared in the same manner as in Example 1 except that a water-absorbing resin powder having a water absorption rate of 35 seconds by the vortex method was used as the water-absorbing resin powder constituting the upper layer absorbent portion 42. A sample of Example 4 was obtained.

Example 5
In Example 1, a urine collection pad was prepared in the same manner as in Example 1 except that the lower layer absorbent portion 44 was changed to the following, and this was taken as Example 5. The lower layer absorbent portion 44 in Example 5 has a non-existence region (joint portion 48) of seven rows of water absorbent resin powder and a presence region 49 of six rows of water absorbent resin powder, and the joint portion 48 and the It was an absorber having a pulpress structure in which the existence areas 49 were alternately arranged in the width direction. In this absorbent body of the pulpress structure, each existence region 49 has a width of 15 mm × a length of 310 mm and a basis weight of the water-absorbent resin powder of 300 g / m ^2, and the width of each joint portion 48 is the both side edges of the absorber. Two rows positioned at 44s and 44s were each 7.5 mm, and the other five rows were 5 mm. The absorbent body of this pulpress structure is a joint portion excluding both side edges 44s and 44s of the absorbent body before being incorporated into the urine collecting pad (before embossing for forming the groove 5 is performed). All 48 were the sheet peeling areas. In addition, the lower layer absorbent portion 44 in Example 5 is incorporated into the urine collection pad in a state where the two rows of existence areas 49 and 49 located near both ends in the width direction are folded on the side facing the back sheet 3. It is.

(Reference Example 1)
In Example 1, the interval T (see FIG. 1) between the adjacent groove portions 5 and 5 is set to 20 mm, and the two adjacent groove portions 5 and 5 are arranged so as to overlap with the existence region 49 of the water absorbent resin powder in the lower layer absorption portion 44. A urine collection pad was prepared in the same manner as in Example 1 except that this was used as Reference Example 1.

[Comparative Example 1]
In Example 1, the mixed product fiber constituting the upper layer absorbent portion 42 and the absorbent body of the pulpress structure constituting the lower layer absorbent portion 44 are turned upside down (that is, the construction of the absorbent structure 4 is sequentially increased from the top sheet 2 side). A base 41, a pulpress structure absorbent body having the same structure as the lower layer absorbent section 44 of the first embodiment, a mixed product fiber having the same structure as the upper layer absorbent section 42 of the first embodiment, and a lower mount 43), and the absorption of the pal press structure. The body was turned over, the second sheet material 46 side was the skin contact surface side, and the urine collecting pad was prepared in the same manner as in Example 1 except that the groove 5 was not formed. This was used as a sample of Comparative Example 1. .

[Comparative Example 2]
In Example 1, the structure of the absorbent structure 4 is an upper mount 41, an upper layer absorbent portion 42, and a lower mount 43 in order from the top sheet 2 side (the lower layer absorbent portion 44 is not used), and the upper layer absorbent portion 42 is a fluff. Using a mixed fiber made by mixing pulp (basis weight 368 g / m ² ) and water-absorbent resin powder (basis weight 115 g / m ² ) having a water absorption rate of 49 seconds by vortex method, and forming no groove 5 A urine collection pad was prepared in the same manner as in Example 1 except that this was used as a sample of Comparative Example 2.

[Evaluation]
About each produced urine collection pad, (1) product thickness, (2) saturated absorption amount, (3) model absorption amount, (4) absorption rate, and (5) liquid return amount were evaluated by the following method, respectively. These results are shown in Table 1 below.

<Evaluation of product thickness>
As shown in FIG. 1, a urine collecting pad is spread in a flat shape, a square (50 mm × 50 mm) plate weight is placed on the center area of the pad, and the thickness of the pad under a pressure of 0.25 kPa is measured by a digital thickness measuring machine. (With a laser displacement sensor: manufactured by Keyence Corporation), and the measured value was defined as the product thickness.

<Evaluation of saturated absorption>
The elastic member 8 constituting the three-dimensional gather is cut so that the urine collection pad does not shrink, and then the urine collection pad is immersed in physiological saline (0.9 wt% sodium chloride aqueous solution) for 30 minutes, and then the urine collection pad Was suspended from a rod and allowed to stand for 30 minutes to drop excess physiological saline, and then the weight of the urine collecting pad was measured. From this measured value, subtract the weight of the urine collection pad before dipping in the physiological saline previously measured to calculate the amount of physiological saline absorbed by the urine collection pad. g). The greater the amount of saturated absorption, the better the body fluid absorption performance, and the less likely it is to leak.

<Evaluation of model absorption>
After fixing the urine collection pad to a static adult mannequin, the mannequin was placed in a supine position and 50 g of physiological saline was injected into the urine collection pad at a flow rate of 5 g / sec. Saline injection was performed at 10 minute intervals and repeated up to the number of leaks. The weight of the urine collection pad was measured 10 minutes after the leak occurred, and the urine collection pad was absorbed by subtracting the pre-measured weight of the urine collection pad before physiological saline injection from the measured value. The amount of physiological saline was calculated and used as a model absorption amount (g). The larger the model absorption, the better the absorption of body fluids, and the less likely it is to leak.

<Evaluation of absorption rate>
The skin contact surface of the urine collecting pad was faced up, the elastic member 8 constituting the three-dimensional gather was cut, and it was fixed in a flat state while stretching the wrinkles. In this state, an absorption rate measuring device with a holed flange (100 mm square, weight 1.2 kgf) having an inner diameter of 45 mm was placed on the top sheet 2 located at the center of the absorption structure 4. 100 g of physiological saline was quickly injected from the upper part of the cylinder of the absorption rate measuring device, and the absorption time (seconds) from the start of injection until the whole amount of physiological saline was absorbed was measured using a stopwatch. Here, since the absorption rate is evaluated by measuring the absorption time, the shorter the absorption time, the faster the absorption rate is considered and the higher the evaluation.

<Evaluation of liquid return>
The elastic member 8 constituting the three-dimensional gather was cut with the urine collection pad facing the skin contact surface, and the urine collecting pad was fixed in a flat state while stretching the wrinkles. In this state, 50 g of physiological saline was injected at a flow rate of 5 g / sec onto the top sheet 2 located at the center of the absorbent structure 4. After 5 minutes from the completion of the injection, water absorbent paper (filter paper No. 2 manufactured by Toyo Roshi Kaisha Co., Ltd., diameter 110 mm, 20 sheets) whose weight has been measured in advance is placed on the physiological saline injection part in the urine collection pad. Further, a weight of Φ100 mm (pressure 44 kPa) was placed thereon. Two minutes after placing the weight, the weight of the physiological saline absorbed by the water-absorbing paper was measured, and this was defined as the first liquid return amount (g). Subsequently, the water-absorbent paper was replaced, and the above procedure was repeated again to measure the second liquid return amount (g). The smaller the value of the first and second liquid return amounts, the lower the liquid return and the higher the evaluation.

  As shown in Table 1, each of the urine collection pads of the examples has a product thickness of 4 mm or less and is thin.

  It can be seen that Example 1 has an absorption speed that is twice or more faster than Comparative Example 1, and also has a large amount of model absorption, and is excellent in absorption performance. Comparative Example 2 is a urine removing pad that uses only a mixed fiber of pulp and a water-absorbent resin powder without using a Pulpress structure absorbent as the absorbent structure, but compared with Example 1. Thus, although the saturated absorption amount is almost the same, the model absorption amount is small, the absorption speed is slow, the liquid return is large, and the absorption performance is inferior. That is, it can be seen that Example 1 is superior in absorption performance of body fluids as compared with Comparative Examples 1 and 2.

  Moreover, it was confirmed that Example 1 is excellent also about touch, texture, and shape stability. That is, with respect to the feel and texture, Comparative Example 1 had a low level that felt the roughness of the water-absorbent resin powder because the upper layer absorbent part was an absorbent body with a pulpress structure, whereas Example 1 was an upper layer absorbent part. Since it contains fluff pulp, it was confirmed to be soft and soft to the touch. Moreover, when the urine absorption pad of Example 1 was mounted on a walking model and the shape stability of the pad after liquid absorption was confirmed, the absorption structure of the urine absorption pad of Example 1 was difficult to twist, Was confirmed to be stable. Such shape stability of Example 1 was not particularly biased by the movement of the water-absorbent resin powder before use, and was difficult to break because the groove located in the urine drainage part was in a non-peeled state, etc. It is assumed that

  Example 2 is an example in which the basis weight of the water-absorbent resin powder in the upper-layer absorbent portion in Example 1 is increased, and Example 3 is an example in which the basis weight of both the pulp and the water-absorbent resin powder is increased in Example 1. It can be seen that, as in Example 1, the absorption performance is excellent.

  In Example 4, the water absorption rate by the vortex method of the water-absorbent resin powder used in the upper layer absorption part is slower than the water absorption rate by the vortex method of the water-absorbent resin powder used in the lower layer absorption part, and the difference between both water absorption rates is This is an example of 10 seconds or more, and the absorption load of the upper layer absorption part is reduced and the repeated absorption performance is maintained as compared with Example 1 in which the water absorption rate is equal in the upper layer absorption part and the lower layer absorption part. Therefore, it can be seen that the second liquid return amount is small.

  Example 5 is an example in which the water-absorbing resin powder existing area and the joining portion in the lower layer absorbent portion are each increased by two rows, and further, both side portions of the lower layer absorbent portion are folded on the side facing the back sheet. Although the model absorption amount in the sleeping state is not so much increased as compared with Example 1, the absorption rate is further increased and the liquid return amount is reduced. It turns out that it is excellent in comfort.

  Reference example 1 is an example in which the groove portion overlaps with the existing area of the water-absorbent resin powder in the lower layer absorbent section, and the existing area is consolidated. It can be seen that, in Reference Example 1, the saturated absorption amount and the absorption speed are decreased and the second liquid return amount is increased as compared with Example 1 due to such a configuration. That is, it can be seen that the absorption performance of Reference Example 1 as a whole is lower than that of Example 1.

FIG. 1 is a plan view schematically showing the skin contact surface side (surface sheet side) in the developed state of the urine pad which is the first embodiment of the present invention. FIG. 2 is a cross-sectional view schematically showing a cross section taken along line XX of FIG. FIG. 3 is a cross-sectional view schematically showing a cross section along line YY in FIG. FIG. 4 is a plan view schematically showing the main parts (upper layer absorption part and lower layer absorption part) of the absorption structure in the urine collection pad shown in FIG. FIG. 5 is a plan view of the lower layer absorbent portion of the urine collection pad shown in FIG. 6 is a cross-sectional view schematically showing a state when the urine collecting pad shown in FIG. 1 is worn. FIG. 7 is a view corresponding to FIG. 2 of the urine collecting pad according to the second embodiment of the present invention. FIG. 8 is a view corresponding to FIG. 2 of the urine collecting pad according to the third embodiment of the present invention. FIG. 9 is a view corresponding to FIG. 2 of a urine collecting pad according to a fourth embodiment of the present invention. FIG. 10 is a plan view of the upper layer absorbent portion of the urine collection pad shown in FIG. FIG. 11 is a diagram schematically showing a modification of the upper-layer absorber shown in FIG. 10, and is a cross-sectional view corresponding to the XX line of FIG. 10 in the modification. FIG. 12 is a view corresponding to FIG. 1 of a urine collection pad according to a fifth embodiment of the present invention. FIG. 13 is a plan view showing another example of the groove portion according to the present invention.

Explanation of symbols

1 Urine pad (absorbent article)
2 Top sheet 3 Back sheet 4 Absorbing structure 5 Groove part 6 End seal part 7 Anti-slip member 8, 9 Elastic member 41 Upper mount 42 Upper layer absorbent part 43 Lower mount 44 Lower layer absorbent part 44s Side along the longitudinal direction of the lower layer absorbent part Edge 45 First sheet material 46 Second sheet material 47 Water-absorbing resin powder 48 Joining portion 49 Water-absorbing resin powder existence area 80 Sheet material A for forming three-dimensional gathers Crotch B Bentral part C Dorsal part

Claims (8)

An absorbent article having an absorbent structure interposed between the top sheet and the back sheet, the absorbent structure comprising an upper layer absorbent part and a lower layer absorbent part in order from the top sheet side,
The upper layer absorbent portion is configured to include fluff pulp, and a groove portion extending in the longitudinal direction of the absorbent article is formed on the skin contact surface of the upper layer absorbent portion.
The lower layer absorbent portion is configured to include two sheet materials facing each other and a water absorbent resin interposed between the two sheet materials, and both the sheet materials are joined to each other without the water absorbent resin interposed therebetween. Have multiple joints,
A plurality of the joint portions are arranged in parallel at a predetermined interval in the width direction of the absorbent article extending in the longitudinal direction and orthogonal to the longitudinal direction, and along the longitudinal direction of the lower layer absorbent portion The joints are arranged on both side edges,
An absorbent article in which the groove portion and the joint portion overlap each other in a plan view at a crotch portion located in the crotch of the wearer when worn.   The absorptive article according to claim 1 in which said surface sheet, said upper layer absorption part, and said lower layer absorption part are consolidated in said slot.   The absorbent article according to claim 1 or 2, wherein a plurality of the groove portions are formed, and the plurality of groove portions are arranged in parallel at predetermined intervals in the width direction. The lower layer absorbent portion has a plurality of existing areas of the water-absorbing resin extending in the longitudinal direction, and the joint portions and the existing areas are alternately arranged in the width direction,
The absorbent article in any one of Claims 1-3 by which the adhesive agent is apply | coated to the inner surface of at least one of the said 2 sheet | seat material in the said existence area.   The at least a part of the joint portion disposed at a portion other than the both side edge portions of the lower layer absorbent portion so that the two sheet materials joined to each other are peeled off by liquid absorption / swelling of the water absorbent resin. The absorbent article according to any one of claims 1 to 4, wherein   The absorptive article according to any one of claims 1 to 5 whose water absorption speed by the vortex method of water-absorbent resin used for said absorption structure is 45 seconds or less.   The upper layer absorbent portion contains a water absorbent resin, and the water absorption rate by the vortex method of the water absorbent resin used in the upper layer absorbent portion is slower than the water absorption rate by the vortex method of the water absorbent resin used in the lower layer absorbent portion. The absorbent article according to any one of claims 1 to 6, wherein the difference between the water absorption speeds is 10 seconds or more.   The upper layer absorbent part contains a water absorbent resin, and the ratio of the water absorbent resin content in the lower layer absorbent part to the water absorbent resin content in the upper layer absorbent part is 1.1 or more. Absorbent article according to crab.

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