Auxiliary absorbent sheet

Abstract

To provide an auxiliary absorbent sheet for increasing a body fluid absorption amount, preventing side leakage and rear leakage of body fluid derived from a body shape and a posture of a wearer, and capable of being used with an absorbent article.SOLUTION: There is provided an auxiliary absorbent sheet 1 comprising: a liquid permeable skin side sheet 14; a liquid permeable non-skin side sheet 15; and a high absorbent polymer 13 provided therebetween. Between the skin side sheet 14 and the non-skin side sheet 15, there are provided: a plurality of polymer existence regions 10 where the high absorbent polymer 13 exists; and a seal part 11 which is obtained by joining the skin side sheet 14 and the non skin side sheet 15 as a polymer non-existence region where there is no high absorbent polymer 13. The seal part 11 surrounds the polymer existence regions 10, and separates the adjacent polymer existence regions 10 in a longitudinal direction and / or a width direction of the auxiliary absorbent sheet 1. The seal part 11 comprises: a cutting possible line 11; and a slip resistance member for fixing the polymer existence region 10 to a prescribed position, and the seal part extends in a non linear state in the longitudinal direction of the auxiliary absorbent sheet 1.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to an auxiliary absorbent sheet.

Background Art

[0002] Absorbent articles include, for example, pad products such as light incontinence pads, light incontinence liners, urine absorbent pads, sanitary napkins, etc., and paper diaper products such as pants-type paper diapers and tape-fastened paper diapers. There are various forms according to the application, and they are widely used regardless of whether the user is an elderly person, an adult, or an infant. In addition, in order to absorb body fluids such as urine that cannot be completely absorbed by the pad product alone, absorb body fluids that leak out from the pad product, or make the paper diaper product last longer in terms of cost, an auxiliary absorbent sheet is used in combination with the absorbent article.

[0003] A general auxiliary absorbent sheet has, for example, a simple structure in which a superabsorbent polymer is disposed between two liquid-permeable nonwoven fabrics, but various other proposals have also been made. Patent Document 1 discloses an auxiliary absorbent sheet including a liquid-permeable upper sheet, a liquid-permeable lower sheet, a plurality of three-dimensional knitted fabrics interposed between these sheets, a seal portion formed by joining the upper sheet and the lower sheet between the plurality of three-dimensional knitted fabrics, and a cuttable line such as a perforation formed in the seal portion (Claim 1). Further, it is described that the planar shape of the three-dimensional knitted fabric is a square shape, a circular shape, an elliptical shape, a triangular shape, a pentagonal shape, or other polygonal shapes (paragraph 0026), and that an absorbent member such as a superabsorbent polymer (SAP) or absorbent pulp can be held by the constituent fibers forming the three-dimensional knitted fabric (paragraph 0048). According to Patent Document 1, it is described that the size can be appropriately adjusted according to the wearer's needs, the usability is good, and an absorption assisting article that can appropriately enclose soft feces or the like inside can be provided (paragraph 0021).

Prior Art Documents

Patent Documents

[0004]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0005] However, when the auxiliary absorbent sheet of Patent Document 1 is used in combination to prevent back leakage of the absorbent article, back leakage is likely to occur, where body fluids such as urine leak from near the wearer's buttocks. When the inventor examined the cause, the following findings were obtained. In the auxiliary absorbent sheet of Patent Document 1, a seal portion 40 where the upper layer sheet 10 and the lower layer sheet 20 are joined is formed around the three-dimensional knitted fabric 30 in the plane direction. A seal portion 40 is interposed between one three-dimensional knitted fabric 30 and another three-dimensional knitted fabric 30 adjacent thereto, and the seal portion 40 extends linearly in the longitudinal direction of the auxiliary absorbent sheet (FIGS. 1 and 7). And although the superabsorbent polymer may be arranged in the three-dimensional knitted fabric 30, it is not arranged in the seal portion 40. As a result, as shown in FIG. 8 of the present specification, although the portion of the superabsorbent polymer arranged in the three-dimensional knitted fabric 30 swells to form a weir for body fluids, on the other hand, the seal portion 40 that does not swell does not swell even when body fluids permeate through it and does not function as a weir. Moreover, since the seal portion 40 is provided linearly in the longitudinal direction, it forms a flow path for body fluids as indicated by the arrow, and back leakage cannot be sufficiently suppressed.

[0006] Further, Patent Document 1 states that "in the present invention, it is preferable that substantially no superabsorbent polymer or absorbent pulp is interposed in the three-dimensional knitted fabric 30. When a superabsorbent polymer or absorbent pulp is interposed in the three-dimensional knitted fabric 30, these absorbent materials expand and deteriorate the fluidity of liquids such as urine in the three-dimensional knitted fabric 30." (paragraph 0049), and it negates the inclusion of a superabsorbent polymer in the three-dimensional knitted fabric 30. Further, although Patent Document 1 describes, as the planar shape of the three-dimensional woven fabric 30, a rectangle extending in the longitudinal direction, a circular shape, an elliptical shape, a triangular shape, a pentagonal shape, other polygonal shapes, etc. (paragraph 0026), there is no description of a method for arranging the three-dimensional woven fabric 30 having such a planar shape, and Patent Document 1 only describes a seal portion 40 extending linearly in the longitudinal direction. A seal portion 40 extending non-linearly in the longitudinal direction is not described in Patent Document 1 and is not obvious from Patent Document 1.

[0007] An object of the present invention is to provide an auxiliary absorbent sheet that can increase the amount of body fluid absorbed, prevent side leakage and back leakage of body fluid resulting from the body shape and posture of the wearer, and can be used in combination with an absorbent article.

Means for Solving the Problems

[0008] As a result of intensive research to solve the above problems, the present inventor has found that an auxiliary absorbent sheet that meets the objectives can be obtained by adjusting the planar shape and arrangement of the polymer presence regions surrounded by the seal portions and providing the seal portions non-linearly in the longitudinal direction, and has completed the present invention. The present invention relates to the following auxiliary absorbent sheet.

[0009] (1) An auxiliary absorbent sheet comprising a liquid-permeable skin-side sheet, a liquid-permeable non-skin-side sheet, and a superabsorbent polymer that is located between the skin-side sheet and the non-skin-side sheet and absorbs and retains body fluid, between the skin-side sheet and the non-skin-side sheet, there are a plurality of polymer presence regions where the superabsorbent polymer is present and polymer non-presence regions where the superabsorbent polymer is not present, The polymer non-existence region is a seal portion that joins the skin-side sheet and the non-skin-side sheet. The seal portion surrounds the polymer existence region in the planar direction, separates adjacent polymer existence regions in the longitudinal direction and / or the width direction of the auxiliary absorbent sheet, The seal portion has a cuttable line that detachably connects adjacent polymer existence regions, and an anti-slip member that fixes the polymer existence region separated by breaking the cuttable line to a predetermined position on the skin surface of the wearer of the auxiliary absorbent sheet. The seal portion is an auxiliary absorbent sheet that extends non-linearly in the longitudinal direction of the auxiliary absorbent sheet. (2) The cuttable line includes three types of cuttable lines that extend in different directions and intersect each other. The auxiliary absorbent sheet according to (1) above is divided into a plurality of polymer existence regions having a triangular shape in plan view by the three types of cuttable lines. (3) The polymer existence region is the polymer existence region having a triangular shape in plan view with a corner protruding to one or the other of the longitudinal directions of the absorbent sheet, of the auxiliary absorbent sheet according to (1) or (2) above. (4) The polymer existence region includes a polymer existence region X having a triangular shape in plan view with a corner protruding to one of the longitudinal directions of the auxiliary absorbent sheet, and a polymer existence region Y having a triangular shape in plan view with a corner protruding to the other of the longitudinal directions of the auxiliary absorbent sheet. The polymer existence region X and the polymer existence region Y are alternately arranged along the longitudinal direction or the width direction of the auxiliary absorbent sheet, of the auxiliary absorbent sheet according to (3) above. (5) The polymer existence region includes a polymer existence region M having a triangular shape in plan view with a corner protruding to one of the width directions of the auxiliary absorbent sheet, and a polymer existence region having a triangular shape in plan view with a corner protruding to the other of the width directions of the auxiliary absorbent sheet. The polymer existence region M and the polymer existence region L are alternately arranged along the longitudinal direction or the width direction of the auxiliary absorbent sheet, of the auxiliary absorbent sheet according to (3) above. (6) The plurality of the polymer presence regions having a circular shape in plan view are arranged in a polka dot pattern, and the periphery of the polymer presence region is surrounded by the seal portion. The auxiliary absorbent sheet according to (1) above. (7) The cuttable line is a perforation. The auxiliary absorbent sheet according to any one of (1) to (6) above.

Advantages of the Invention

[0010] According to the present invention, it is possible to increase the amount of body fluid absorbed, prevent side leakage and back leakage of body fluid derived from the body shape and posture of the wearer, and provide an auxiliary absorbent sheet used in combination with an absorbent article.

Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0012] In this specification, the wearing of the auxiliary absorbent sheet refers to a state in which the auxiliary absorbent sheet is worn on the wearer's body together with the absorbent article, regardless of whether it is before or after body fluid absorption. The longitudinal direction, width direction, and thickness direction of the auxiliary absorbent sheet are the same as the longitudinal direction, width direction, and thickness direction of the absorbent article used in combination, respectively. The longitudinal direction of the absorbent article is the direction indicated by Y in the figure, which extends back and forth through the crotch of the wearer when the absorbent article 50 is worn. The width direction is the direction indicated by X in the figure, which is substantially orthogonal to the longitudinal direction. The thickness direction is the direction indicated by Z in the figure, in which the respective constituent members are laminated. The skin-side surface of the auxiliary absorbent sheet is the surface that contacts the wearer's skin or faces the skin, and the non-skin-side surface is the surface that contacts the wearer's clothing or faces the clothing. Body fluid refers to a liquid discharged from the body to the outside, such as urine, blood, and moisture in soft feces.

[0013] <Auxiliary absorbent sheet> Hereinafter, the auxiliary absorbent sheets 1, 2, and 3 according to the present embodiment will be described with reference to the drawings. FIGS. 1 to 3 show the auxiliary absorbent sheet 1. FIGS. 4 and 5 show the auxiliary absorbent sheet 2. FIG. 6 shows the auxiliary absorbent sheet 3. FIG. 8 is a plan view for explaining the problems of the prior art (Patent Document 1). Each figure does not define the size relationship or the like of the auxiliary absorbent sheets 1, 2, and 3.

[0014] The auxiliary absorbent sheets 1, 2, and 3 of the present embodiment are a type of absorbent article and are used in combination with other absorbent articles. Examples of the absorbent articles that can be combined include various types for babies, adults, and the elderly, such as pad products such as light incontinence pads, light incontinence liners, urine absorbent pads, and sanitary napkins, paper diaper products such as panty-type paper diapers and tape-fastened paper diapers, and combinations of pad products as inners and paper diaper products as outers. The dimension in the longitudinal direction of the absorbent article that can be combined is, for example, in the range of 100 mm or more and 800 mm or less, and the dimension in the width direction is, for example, in the range of 50 mm or more and 500 mm or less. Further, the auxiliary absorbent sheets 1, 2, and 3 have a longitudinal dimension in the range of, for example, 100 mm or more and 350 mm, and a width dimension in the range of, for example, 50 mm or more and 220 mm or less.

[0015] As shown in FIGS. 1 to 6, the auxiliary absorbent sheets 1, 2, and 3 according to the present embodiment have the following three structures (a) to (c). (a) It has a liquid-permeable skin-side sheet 14, a liquid-permeable non-skin-side sheet 15, and a superabsorbent polymer 13 that is located between the skin-side sheet 14 and the non-skin-side sheet 15 and absorbs and holds body fluid. (b) Between the skin-side sheet 14 and the non-skin-side sheet 15, there are a plurality of polymer presence regions 10, 10a, 10b where the superabsorbent polymer 13 is present, and a polymer non-presence region where the superabsorbent polymer 13 is not present. The polymer non-presence region is a seal portion 11, 11a, 11b that joins the skin-side sheet 14 and the non-skin-side sheet 15. The seal portions 11, 11a, 11b surround the periphery of the polymer presence regions 10, 10a, 10b in the plane direction and separate the adjacent polymer presence regions 10, 10a, 10b in the longitudinal direction and / or width direction of the auxiliary absorbent sheets 1, 2, 3. (c) The seal portions 11, 11a, 11b have a cuttable line 12, 12a, 12b that detachably connects the adjacent polymer presence regions 10, 10a, 10b, and a non-slip member (not shown) that fixes the polymer presence regions 10, 10a, 10b obtained by breaking and separating the cuttable lines 12, 12a, 12b to a predetermined position on the skin surface of the wearer of the auxiliary absorbent sheet 1. The seal portions 11, 11a, 11b extend non-linearly in the longitudinal direction of the auxiliary absorbent sheet 1.

[0016] According to the auxiliary absorbent sheets 1, 2, and 3 of the present embodiment, by selecting the planar shape and arrangement method of the polymer presence regions 10, 10a, 10b and configuring the seal portions 11, 11a, 11b, which are likely to form a flow path for body fluid, to extend non-linearly in the longitudinal direction of the auxiliary absorbent sheets 1, 2, and 3, part of the body fluid flowing through the seal portions 11, 11a, 11b is absorbed by the polymer presence regions 10, 10a, 10b, and the other part flows obliquely with respect to the longitudinal direction and is absorbed by another polymer presence region 10, 10a, 10b, making it difficult for the body fluid to reach the vicinity of the wearer's buttocks, which is the end point in the longitudinal direction, and preventing back leakage. In addition, by additionally disposing the auxiliary absorbent sheets 1, 2, 3 or partial pieces thereof at locations where a gap is likely to be formed between the wearer's body and the absorbent article, it is possible to keep the increase in the total amount of the absorbent article as a whole low, increase the body fluid absorption amount without impairing the wearing feeling, and prevent back leakage of the body fluid. In addition, with respect to back leakage and side leakage from specific parts such as the crotch and the back side, which are caused by the body shape of the absorbent article wearer and the posture during wearing, by adding the auxiliary absorbent sheets 1, 2, 3 inside the parts, back leakage and side leakage can be suppressed and eliminated. Furthermore, by providing an anti-slip member at the seal portions 11, 11a, 11b, it is possible to prevent a decrease in the body fluid absorption performance of the absorbent article used in combination with the auxiliary absorbent sheets 1, 2, 3.

[0017] Hereinafter, the auxiliary absorbent sheets 1, 2, 3 according to the first to third embodiments and other forms of auxiliary absorbent sheets will be described more specifically.

[0018] <Auxiliary Absorbent Sheet According to the First Embodiment> The auxiliary absorbent sheet 1 according to the first embodiment is used together with an absorbent article to prevent side leakage, back leakage, etc. from a site where a gap is likely to occur between the crotch portion, buttocks, or back of the wearer and the end of the absorbent article due to the body shape of the wearer, the posture during wearing, etc. More specifically, as shown in FIG. 7, since side leakage is likely to occur from the periphery of the crotch portion of the wearer and the three-dimensional gathers 24 of the crotch portion of the absorbent article, the auxiliary absorbent sheet 1 is cut into long and narrow fragments 30a and 30b by the cuttable line 12 and arranged. Further, when the wearer of the absorbent article is in the supine position, body fluid is likely to leak back from the periphery of the buttocks and back of the wearer and the rear end of the back side portion of the absorbent article, so the fragment 31 of the auxiliary absorbent sheet 1 is arranged. In this way, by arranging the auxiliary absorbent sheet 1 or its fragments 30a, 30b, and 31 to reduce or eliminate the gap, side leakage and back leakage are prevented. Note that the body fluid that has passed through the auxiliary absorbent sheet 1 is easily absorbed by the absorbent article used in combination. Further, the auxiliary absorbent sheet 1 is worn on the wearer so that its longitudinal direction coincides with the longitudinal direction of the absorbent article used in combination. Such effects and usage methods are common not only to the auxiliary absorbent sheet 1 but also to the auxiliary absorbent sheets of this embodiment.

[0019] (Polymer presence region) As shown in FIG. 1, the auxiliary absorbent sheet 1 has three types of cuttable lines 12 (or seal portions 11) whose extending directions are different and intersect each other, and is divided into a plurality of polymer presence regions 10 having a triangular shape in plan view by the three types of cuttable lines 12 (or seal portions 11). These polymer presence regions 10 include a polymer presence region 10 having a triangular shape in plan view with a corner protruding in one direction of the longitudinal direction of the auxiliary absorbent sheet 1 and a polymer presence region 10 having a triangular shape in plan view with a corner protruding in the other direction of the longitudinal direction of the auxiliary absorbent sheet 1, and these two types of polymer presence regions 10 are alternately arranged in both the longitudinal direction and the width direction. Such an arrangement is a scale pattern in which triangles are alternately arranged and replaced, and is also called an alternate pattern. The dimensions of each of the longitudinal direction and the width direction of the polymer presence region 10 are preferably adjusted to be in the range of 5 mm or more and 50 mm or less from the viewpoint of the absorbency of body fluid and the like.

[0020] By arranging the polymer presence regions 10 in a triangular shape in plan view as described above, the seal portions 11, which are present around the polymer presence regions 10 and are likely to form a flow path for body fluid, are configured to extend in a direction oblique (arrow A) to the longitudinal direction or to be bent in a zigzag (arrow B) as shown in FIG. 3, so as to extend non-linearly with respect to the longitudinal direction. The body fluid that leaks from the absorbent article and reaches the auxiliary absorbent sheet 1 collides with the polymer presence regions 10 that are oblique to the flow direction of the body fluid (which coincides with the longitudinal direction), and most of it is absorbed. Even if a part remains unabsorbed, it will be absorbed by other polymer presence regions 10 before reaching the vicinity of the wearer's buttocks, preventing back leakage.

[0021] Not limited to this embodiment, for example, the polymer presence regions 10 may include a polymer presence region 10 in a triangular shape in plan view having a corner protruding toward one side in the width direction of the auxiliary absorbent sheet 1 and a polymer presence region 10 in a triangular shape in plan view having a corner protruding toward the other side in the width direction of the auxiliary absorbent sheet 1, and these two types of polymer presence regions 10 may be arranged alternately in the longitudinal direction or the width direction of the auxiliary absorbent sheet 1.

[0022] The polymer presence region 10 houses the superabsorbent polymer 13 in the space between the liquid-permeable skin-side sheet 14 and the liquid-permeable non-skin-side sheet 15, and joins and seals the surrounding skin-side sheet 14 and non-skin-side sheet 15 in the plane direction. The skin-side sheet 14 and the non-skin-side sheet 15 are, for example, liquid-permeable sheet-like base materials with a soft feel and that do not irritate the skin so that they may directly contact the wearer's skin. Examples of such base materials include hydrophilic sheets, composite nonwoven fabrics that are laminates of the same or different hydrophilic sheets, perforated films such as perforated polyethylene films, foamed films such as polyethylene foams and urethane foams, etc. Examples of hydrophilic sheets include air-through nonwoven fabrics, thermal bond nonwoven fabrics, spunlace nonwoven fabrics, spunbond nonwoven fabrics, pulp-containing nonwoven fabrics, etc. made using synthetic fibers made of synthetic resins such as polypropylene and polyethylene, regenerated fibers such as rayon, and natural fibers such as cotton. Among these, nonwoven fabrics are preferred.

[0023] From the perspective of improving liquid permeability, the skin side sheet 14 and the non-skin side sheet 15 may be embossed or perforated on the surface. From the perspective of reducing irritation to the skin, the skin side sheet 14 and the non-skin side sheet 15 may contain one or more of lotion, antioxidant, anti-inflammatory component, pH adjuster, antibacterial agent, moisturizer, etc. The basis weight of the skin side sheet 14 and the non-skin side sheet 15 is, from the perspectives of strength, processability, and liquid return amount, for example, 15 g / m 2 to 40 g / m 2 in the following range. The skin side sheet 14 and the non-skin side sheet 15 may be the same or different.

[0024] (Superabsorbent polymer) The superabsorbent polymer 13 is not particularly limited as long as it can absorb body fluid and prevent backflow, and examples include polyacrylate, polyaspartate, (starch-acrylic acid) graft copolymer, (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer, and its saponified product. Among them, from the perspective of the absorption amount per unit weight, polyacrylate is preferred, an alkali metal salt of polyacrylate is more preferred, and sodium polyacrylate is even more preferred. The superabsorbent polymer 13 can be used alone or in combination of two or more.

[0025] The superabsorbent polymer 13 is used, for example, in the form of particles, fibers, etc., but is preferably used in the form of particles from the perspective of ease of handling, etc. At this time, by avoiding the use of the superabsorbent polymer 13 in the form of fine powder with poor fluidity as a powder and using the superabsorbent polymer 13 having a median particle size, the basic performance related to absorption can be enhanced, and the rough touch generated by the hardening of the absorber 20 after absorbing body fluid can be reduced. The median particle size of the superabsorbent polymer 13 is, for example, in the range of 50 μm or more and 600 μm or less, or in the range of 100 μm or more and 500 μm or less.

[0026] The amount of the superabsorbent polymer 13 contained in the polymer presence region 10 may be set, for example, to an amount such that the body fluid absorption amount per polymer presence region 10 is 1 cc or more and 10 cc or less. In order to set as described above, for example, the basis weight of the superabsorbent polymer 13 in each polymer presence region 10 is 150 g / m 2 or more and 800 g / m 2 or less, or 200 g / m 2 or more and 700 g / m 2 or less.

[0027] (Sealing part) The sealing part 11 that separates adjacent polymer presence regions 10 is formed by joining the skin-side sheet 14 and the non-skin-side sheet 15 in a region where the superabsorbent polymer 13 does not exist (polymer non-existence region) between the skin-side sheet 14 and the non-skin-side sheet 15. The joining of the skin-side sheet 14 and the non-skin-side sheet 15 is performed, for example, by ultrasonic welding, thermal welding, etc. The width of the sealing part 11 can be appropriately selected according to the planar shape of the polymer presence region 10, the materials of the skin-side sheet 14 and the non-skin-side sheet 15, etc., but is, for example, in the range of 1 mm or more and 20 mm or less. Here, the width of the sealing part 11 is defined as the length dimension of the sealing part 11 in a direction perpendicular to the cuttable line 12 provided in the sealing part 11 described later.

[0028] (Cuttable line) In the present embodiment, the cuttable line 12 is provided so as to extend along the sealing part 11 at approximately the center in the width direction of the sealing part 11. By breaking the cuttable line 12, adjacent polymer presence regions 10 can be separated, so that the auxiliary absorbent sheet 1 can be adjusted to a predetermined size according to the wearing position. Examples of the cuttable line 12 include perforations.

[0029] (Anti-slip member) The anti-slip member fixes the auxiliary absorbent sheet 1, which is an aggregate of polymer presence regions 10, or the polymer presence regions 10 obtained by partially separating the auxiliary absorbent sheet 1 by the cuttable line 12, at a predetermined position on the skin surface of the wearer. Here, the skin surface of the wearer includes not only the skin of the wearer and clothing such as the underwear of the wearer, but also the skin-side and non-skin-side surfaces of the absorbent article used in combination by the wearer. At least one end of the anti-slip member is provided, for example, on the non-skin-side surface of the seal portion 11, between the cuttable line 12 and one end or the other end in the width direction of the seal portion 11. By limiting the arrangement of the anti-slip member to the seal portion 11, the body fluid absorption performance of the absorbent article used in combination is not impaired. Examples of the anti-slip member include a sheet-like base material having a planar shape such as a strip (rectangular) shape, an oval shape, or an elliptical shape, with an adhesive layer provided at one end in the longitudinal direction and joined to the non-skin-side surface of the seal portion 11, and an adhesive layer and a release sheet, release paper, etc. attached to the surface of the adhesive layer also provided at the other end in the longitudinal direction. At the time of wearing, the release sheet or the like is peeled off and the adhesive layer is attached and fixed to the skin surface of the wearer. Also, a mechanical fastener such as a hook-and-loop fastener may be used instead of the adhesive layer.

[0030] (Adhesive) For the formation of the adhesive layer of the anti-slip member, for example, a hot melt adhesive is used. As the hot melt adhesive, those having a melting point of 100°C or higher and 180°C or lower can be used without particular limitation. Examples include synthetic rubber-based hot melt adhesives such as styrene-butadiene-styrene copolymers and styrene-isoprene-styrene copolymers, and olefin-based hot melt adhesives such as ethylene-vinyl acetate copolymers. As the coating method of the hot melt adhesive, known methods such as the curtain coating method, the spiral method, and the slot method, in which the molten hot melt adhesive is applied non-contact or contact from a nozzle, can be used. The content of the hot melt adhesive in the adhesive layer is, for example, 10 g / m from the viewpoint of not impairing the body fluid absorbency of the superabsorbent polymer 13 and the feel on the skin during wearing. 2 It is in the following range.

[0031] <Manufacturing method of auxiliary absorbent sheet> The auxiliary absorbent sheet 1 can be manufactured by a method including, for example, a step of spraying a predetermined amount of superabsorbent polymer 13 on the skin-side surface of the non-skin-side sheet 15 according to the planar shapes of the polymer presence region 10 and the seal portion 11, a step of obtaining a laminate by overlapping the skin-side sheet 14 on the skin-side surface of the non-skin-side sheet 15 on which the superabsorbent polymer 13 has been sprayed, a step of forming the sheet portion 12 by joining the polymer non-presence regions of the laminate obtained in the previous step by ultrasonic welding, thermal welding, pressure heating welding, etc., a step of forming a cuttable line such as a perforation in the sheet portion 12, and a step of attaching an anti-slip member to the surface of the sheet portion 12.

[0032] <Auxiliary Absorbent Sheet According to the Second Embodiment> The auxiliary absorbent sheet 2 according to the second embodiment has the same configuration as the auxiliary absorbent sheet 1 except that the planar shapes of the plurality of polymer presence regions 10a and the seal portions 11a that exist around and separate the adjacent polymer presence regions 10a are different. In the present embodiment, as shown in FIG. 4, the planar shape of the polymer presence region 10a is circular, and the plurality of polymer presence regions 10a are arranged in a polka dot pattern. The polka dot pattern is an arrangement method in which a plurality of rows of polymer presence regions 10a are arranged at predetermined intervals in the width direction, and a plurality of such rows are arranged in the longitudinal direction. There is a phase difference between two adjacent rows in the longitudinal direction, and the polymer presence regions 10a in one row and the seal portions 11a between the polymer presence regions 10a in the other row are arranged in a line in the longitudinal direction. The seal portion 11a surrounds each polymer presence region 10a in the plane direction and separates the adjacent polymer presence regions 10a. The cuttable line 12a is formed near the center of the width of the seal portion 11a, surrounds each polymer presence region 10a in a hexagonal shape, and is configured to have a structure in which hexagons are arranged in a honeycomb shape as a whole.

[0033] According to the auxiliary absorbent sheet 2 according to the second embodiment, since the seal portion 11a is formed in a non-linear shape so as to curve in the longitudinal direction along the contour of the polymer presence region 10a having a circular shape in plan view, as shown by the arrow C in FIG. 5, even if body fluid flows in the longitudinal direction according to gravity, it collides with the polymer presence region 10a on the way and is absorbed, and by repeating such absorption a plurality of times, back leakage and side leakage can be prevented.

[0034] <Auxiliary Absorbent Sheet According to the Third Embodiment> The auxiliary absorbent sheet 3 according to the third embodiment has the same configuration as the auxiliary absorbent sheet 2 except that the shape of the polymer presence region 10b in plan view is different from that of the polymer presence region 10a of the auxiliary absorbent sheet 2. In the auxiliary absorbent sheet 3, as shown in FIG. 6, a plurality of polymer presence regions 10b having a triangular shape in plan view with corner portions protruding in the longitudinal direction are arranged in a scale pattern. The scale pattern is an arrangement method in which a plurality of rows in which a plurality of polymer presence regions 10b are arranged at predetermined intervals in the width direction are arranged in the longitudinal direction, and in two adjacent rows in the longitudinal direction, the polymer presence regions 10b of one row and the seal portion 11b between the polymer presence regions 10b of the other row are configured to be aligned in the longitudinal direction. The seal portion 11b surrounds each polymer presence region 10b in the plane direction and separates adjacent polymer presence regions 10b, similarly to the seal portion 11a of the auxiliary absorbent sheet 2. The cuttable line 12b is configured to surround the polymer presence region 10b in a triangular shape along the edge of each polymer presence region 10a.

[0035] According to the auxiliary absorbent sheet 3 according to the third embodiment, since the seal portion 11b is formed in a non-linear shape in the longitudinal direction in a direction inclined in the longitudinal direction or in a zigzag direction (arrow D in FIG. 6) along the contour of the polymer presence region 10b having a triangular shape in plan view, even if body fluid flows in the longitudinal direction according to gravity, it collides with the polymer presence region 10b on the way and is absorbed, and by repeating such absorption a plurality of times, back leakage and side leakage can be prevented.

[0036] In addition to the first to third embodiments, examples of the planar shape of the polymer presence region include a rectangle, an oblong, an ellipse, a gourd shape, etc., which are long in the width direction. Even with these planar shapes, a plurality of rows of polymer presence regions arranged at a predetermined interval in the width direction are arranged in the longitudinal direction, and in two longitudinally adjacent rows, a phase difference is provided in each row so that the seal portion between the polymer presence region in one row and the polymer presence region in the other row is aligned in the longitudinal direction, so that the seal portion is curved or bent and extends in a non-linear shape in the longitudinal direction, thereby preventing back leakage and side leakage of body fluid.

[0037] As a specific example of the absorbent article used in combination with the auxiliary absorbent sheets 1, 2, and 3 of the present embodiment, for example, the absorbent article 20 shown in FIG. 7 can be mentioned. The absorbent article 20 is a type of pad product, and for example, a topsheet 21 whose skin side contacts the wearer's skin and / or undergarment, a backsheet 22 having a predetermined planar shape whose non-skin side contacts the wearer's undergarment or clothing, an absorber 23 located between them, a pair of three-dimensional gathers 24 provided so as to extend in the longitudinal direction near both ends in the width direction of the skin side surface of the topsheet 21, and anti-slip members 25 provided at both ends in the width direction at one end in the longitudinal direction.

[0038] For the topsheet 21 that guides body fluid to the absorber 23, a sheet-like base material with the same liquid permeability as the skin-side sheet 14 and non-skin-side sheet 15 of the present embodiment is used. For the backsheet 22 that prevents body fluid from adhering to the wearer's clothing, etc., for example, a liquid-impermeable sheet-like base material such as a resin film or a liquid-impermeable non-woven fabric is used. For the absorber 23 that absorbs and holds body fluid, for example, an absorber containing absorbent fibers such as fluff pulp and superabsorbent polymer 13, a sheet-like absorber in which the superabsorbent polymer 13 is supported between two hydrophilic sheet-like base materials such as hydrophilic non-woven fabrics, etc. are used. The three-dimensional gathers 24 include, for example, a liquid-impermeable sheet-like base material and an elastic stretch member disposed so as to extend in the longitudinal direction near the end portion of the base material on the topsheet 21 side. The anti-slip member 25 has the same configuration as the anti-slip member of the present embodiment described above. Various conventionally known modifications can be implemented in the absorbent article 20 without limitation.

[0039] Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments and examples. It is obvious to those skilled in the art that various changes or improvements can be made to the above embodiments. Also, it is clear from the description of the claims that forms with such changes or improvements can also be included in the technical scope of the present invention.

Explanation of Reference Numerals

[0040] 1, 2, 3 Auxiliary Absorbent Sheet 10, 10a, 10b Polymer Presence Region 11, 11a, 11b Seal Portion 12, 12a, 12b Cuttable Line 13 Super Absorbent Polymer 14 Skin-Side Sheet 15 Non-Skin-Side Sheet 20 Absorbent Article 21 Top Sheet 22 Back Sheet 23 Absorbent Body 24 Three-Dimensional Gather 25 Anti-Slip Member

Claims

1. An auxiliary absorbent sheet comprising a liquid-permeable skin-side sheet, a liquid-permeable non-skin-side sheet, and a superabsorbent polymer located between the skin-side sheet and the non-skin-side sheet for absorbing and retaining body fluids, wherein the median particle diameter of the superabsorbent polymer is 50 μm or more and 600 μm or less, between the skin-side sheet and the non-skin-side sheet, there are a plurality of polymer presence regions where the superabsorbent polymer is present and polymer absence regions where the superabsorbent polymer is not present, the polymer absence region is a seal portion that joins the skin-side sheet and the non-skin-side sheet, and the seal portion surrounds the periphery of the polymer presence region in the plane direction, separating adjacent polymer presence regions in the longitudinal direction and / or width direction of the auxiliary absorbent sheet, the seal portion has a cuttable line that detachably connects adjacent polymer presence regions and a non-slip member that fixes the polymer presence region separated by breaking the cuttable line to a predetermined position on the skin surface of the wearer of the auxiliary absorbent sheet, the seal portion extends non-linearly in the longitudinal direction of the auxiliary absorbent sheet, the cuttable line includes three types of cuttable lines that extend in different directions and intersect each other, the auxiliary absorbent sheet is divided into a plurality of polymer presence regions having a triangular shape in plan view by the three types of cuttable lines, the polymer presence region is a polymer presence region having a triangular shape in plan view with a corner protruding in one or the other of the longitudinal directions of the auxiliary absorbent sheet, the polymer presence region includes a polymer presence region X having a triangular shape in plan view with a corner protruding in one of the longitudinal directions of the auxiliary absorbent sheet and a polymer presence region Y having a triangular shape in plan view with a corner protruding in the other of the longitudinal directions of the auxiliary absorbent sheet, the polymer presence region X and the polymer presence region Y are alternately arranged along the longitudinal direction or the width direction of the auxiliary absorbent sheet. An auxiliary absorbent sheet.

2. The auxiliary absorbent sheet according to claim 1, wherein the cuttable line is a perforation.

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