JP6631732B1 - Absorbent body and absorbent article including the same - Google Patents

Abstract

An object of the present invention is to provide a technique capable of suppressing leakage and reversion of a liquid. The present invention relates to an absorbent body, a base material formed of a nonwoven fabric and permeable to a liquid, and an upper SAP layer disposed on the surface of the base material and containing particles of a superabsorbent polymer, SAP. And a lower SAP layer disposed on the back surface of the base material and containing particles of SAP, which is a superabsorbent polymer, wherein the upper SAP layer has a smaller amount of SAP than the lower SAP layer. [Selection] Figure 2

Description

  The present invention relates to an absorbent body comprising SAP, which is a superabsorbent polymer.

  BACKGROUND ART Absorbent articles such as disposable diapers, urine pads, and sanitary articles are provided with an absorber that absorbs liquid such as urine and body fluid. Pulp and a superabsorbent polymer (Super Absorbent Polymer: SAP) are used for the absorber. The absorber is formed in a shape such as a thin sheet or a mat. For example, Patent Literature 1 discloses an absorbent composite in which SAP particles are fixed to a nonwoven fabric substrate or the like using a binder such as a thermoplastic resin.

JP-A-2000-24033

  The absorbent preferably retains the liquid distal to the wearer's skin. However, in the absorber in which the SAP particles are fixed to the non-woven fabric substrate, when the SAP particles are disposed only on the back surface side of the base material remote from the wearer's skin, the necessary amount of SAP for absorbing and retaining a predetermined amount of liquid is obtained. The density of the SAP on the side is too high and gel blocking is likely to occur after the SAP has absorbed the liquid. Therefore, it is preferable to dispose the SAP on both surfaces of the nonwoven fabric substrate. However, when the SAP arranged on the surface of the nonwoven fabric becomes gel-like, the liquid permeability on the surface side is reduced and the liquid diffuses throughout the absorber. This causes liquid leakage. For this reason, the nonwoven fabric substrate surface of the absorber is required to have both liquid absorbability and liquid permeability. Further, when the SAP becomes gel-like and the amount of retained liquid is reduced, the liquid once absorbed by the absorber may return to the wearer's skin side, causing reversion.

  Therefore, an object of the present invention is to provide a technique capable of suppressing leakage and reversion of a liquid.

  In order to solve the above problem, in the present invention, the amount of the SAP in the upper SAP layer is smaller than that in the lower SAP layer.

  In particular, the present invention relates to an absorbent body comprising a substrate formed of a non-woven fabric and permeable to a liquid, and a SAP disposed on the surface of the substrate and comprising particles of a superabsorbent polymer SAP. A lower SAP layer disposed on the back side of the substrate and containing particles of a superabsorbent polymer, SAP, wherein the upper SAP layer has a lower amount of SAP than the lower SAP layer.

  In the absorber, the upper SAP layer is disposed on both sides in the width direction along the center in the width direction of the base material, extends in the longitudinal direction of the base material, and is disposed on the surface side of the base material. May be formed with a groove at the center in the width direction and along the upper SAP layer on both sides.

  In the above absorber, the upper SAP layer may have higher liquid permeability than the lower SAP layer.

The absorber may include a first nonwoven fabric sheet arranged to cover the surface of the base material, and a second nonwoven fabric sheet arranged to cover the back surface of the base material.

  The absorbent body includes a core wrap sheet that covers an outer periphery of an absorbent composite including the base material, the upper SAP layer, the lower SAP layer, the first nonwoven sheet, and the second nonwoven sheet. May be.

  The absorber may include a compressed groove formed by compressing the core wrap sheet, the first nonwoven sheet, and the substrate.

  Further, the present invention can be understood from the aspect of the absorbent article. For example, the present invention is an absorbent article that absorbs a liquid discharged by a wearer, a liquid-impermeable back sheet, a liquid-permeable top sheet joined to the back sheet, and the back sheet. And the absorber disposed between the top sheet and the top sheet.

  The absorbent article may include a compressed groove formed by compressing a part of the base material of the absorber from the top sheet.

  ADVANTAGE OF THE INVENTION According to this invention, leakage and reversion of a liquid can be suppressed.

FIG. 1 is a plan view of the absorber according to the embodiment. FIG. 2 is a cross-sectional view of the absorber according to the embodiment. FIG. 3 is a plan view of the absorber according to the embodiment. FIG. 4 is a cross-sectional view of the absorber according to the embodiment. FIG. 5 is a cross-sectional view of the absorber according to the embodiment. FIG. 6 is a plan view of the absorber according to the embodiment. FIG. 7 is a cross-sectional view of the absorber according to the embodiment. FIG. 8 is a diagram showing a schematic configuration of the absorbent article. FIG. 9 is an exploded view of the absorbent article for each part. FIG. 10 is a cross-sectional view of the absorbent article. FIG. 11 is a cross-sectional view of the absorbent article.

  Hereinafter, embodiments of the present invention will be described. The embodiment shown below is an example of an embodiment of the present invention, and does not limit the technical scope of the present invention to the following aspects.

<Embodiment>
FIG. 1 is a plan view of the absorber according to the embodiment. The absorber 6 is formed in a sheet shape having a rectangular shape in plan view. FIG. 1 shows a state in which the absorbent body 6 is viewed from a surface side which is a skin facing surface side facing the wearer's skin when the absorbent body 6 is arranged on an absorbent article such as a diaper.

  FIG. 2 is a cross-sectional view when the absorber 6 is cut along the AA cross section (cross section along the width direction of the absorber 6) shown in FIG. The absorber 6 has a uniform cross section over the entire length. In FIG. 2, gaps are provided between the components to make the components of the absorber 6 easy to understand. However, practically, almost no gaps are formed between the components.

The absorber 6 includes a substrate 61. The base material 61 is formed in a rectangular sheet shape. The base material 61 has a thickness of about 1 mm to 10 manufactured by an air through method, a needle punch method, or the like.
mm non-woven fabric is used. The base material 61 transmits and diffuses the liquid.

  The absorber 6 is disposed on the surface of the base material 61 and includes SAP layers 62L and 62R (an example of an “upper SAP layer”) including particles of SAP (Super Absorbent Polymer), which is a superabsorbent polymer. Here, when the absorbent body 6 is arranged on the absorbent article, the surface of the base material 61 is arranged on the skin facing surface side, and the back surface of the base material 61 is arranged on the skin non-facing surface side opposite to the skin facing surface side. Be placed. The SAP layers 62L and 62R are arranged on the surface of the base material 61 and on both sides in the width direction along the center in the width direction of the base material 61, and extend in the longitudinal direction of the base material 61. The longitudinal direction of the substrate 61 is orthogonal to the width direction of the substrate 61.

  When the absorber 6 is arranged on the absorbent article, the SAP layer 62L is located on the left side of the wearer of the absorbent article, and the SAP layer 62R is located on the right side of the wearer of the absorbent article. The SAP layers 62L and 62R are formed by attaching a plurality of SAP particles to the surface of the base material 61 with an adhesive. In the SAP layers 62L and 62R, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layers 62L and 62R. The SAP layers 62L and 62R extend over the entire length of the base 61.

  Further, the absorber 6 is provided on the back surface of the base material 61 and includes an SAP layer 63 (an example of a “lower SAP layer”) containing SAP particles. The SAP layer 63 is formed on substantially the entire back surface of the base material 61. The SAP layer 63 is formed by attaching a plurality of SAP particles to the surface of the base material 61 with an adhesive. In the SAP layer 63, the SAP particles are arranged substantially uniformly. The base material 61 holds the SAP layer 63. By providing the SAP layer 63, the absorber 6 increases the liquid absorption and retention amount as a whole. Note that SAP particles may be contained in gaps in the base material 61.

  SAP absorbs liquid about 10 to 100 times its own weight. As the SAP, for example, a granular SAP before liquid absorption is used.

  Here, the SAP layers 62L and 62R have a smaller amount of SAP than the SAP layer 63. The liquid absorption amount (liquid holding amount) in the SAP layer is proportional to the SAP amount. Since the absorber 6 according to the present embodiment includes the SAP layer 63 containing a larger amount of SAP than the SAP layers 62L and 63R, it suppresses liquid leakage without lowering the overall liquid absorption and retention amount. it can. Furthermore, the absorbent layer 6 has a lower SAP layer 62L, 62R than the SAP layer 63, so that the SAP layer 62L disposed closer to the wearer's skin when disposed on the absorbent article. The SAP layer 63 disposed farther from the skin can absorb and retain a larger amount of liquid. Thereby, since the absorber 6 holds a relatively large amount of urine by the SAP layer 63 disposed distally from the wearer's skin, it is possible to suppress a feeling of wetness on the skin surface and to suppress a decrease in a feeling of wearing. Note that the amount of SAP in the SAP layer may be defined by the basis weight or the amount of spray (g).

Further, the SAP layers 62L and 62R may have higher liquid permeability than the SAP layer 63. These can be set according to the type of SAP arranged in each SAP layer. Liquid permeability is defined as the volume of liquid permeated per minute (ml). First, a biocolumn having an inner diameter of 25.4 mm (such as a biocolumn CF-30K manufactured by As One Corporation) equipped with a filter (Bio Column Filter 30SUS manufactured by As One Corporation) is prepared. As the biocolumn, one having a mark on the liquid amount of 60 ml and 40 ml, or one having a mark on the liquid amount of 60 ml and 40 ml is used. Next, 150.0 ml (± 1.5 ml) of physiological saline having a concentration of 0.900% (± 0.009%) and a temperature of 25 ° C. (± 2 ° C.) is placed in a 200 ml beaker. Next, 0.320 g (± 0.003 g) of SAP is put in the beaker and immersed for 30 minutes with stirring. Next, after all the contents of the beaker were put into the biocolumn, the opening
A cylindrical rod having a diameter of 2 mm and a wire mesh having a diameter of 25 mm at the tip is inserted into the inner column of the biocolumn so that the wire mesh comes into contact with the SAP, and a weight of 0.3 psi is applied to the SAP. Put. Next, the cock of the biocolumn is opened, the liquid level is lowered until the liquid level in the biocolumn tube is about 5 cm above the 60 ml line, and the state is waited for 1 minute. Next, the cock of the biocolumn is opened, and the time (T1) required for the liquid level to drop from the 60 ml line to the 40 ml line is measured. In addition, the same test is performed without the SAP, and the time (T0) is measured.

The liquid permeability of the SAP is determined by applying the values of T1 and T0 obtained in the above test to the following equation (1).
Liquid permeability (ml / min) = 20 / (T1-T0) (1)

  For the SAP layers 62L and 62R, an SAP having a liquid permeability of 30 (ml / min) or more may be used. In this case, the SAP layers 62L and 62R have a liquid permeability of 30 (ml / min) or more than that of the SAP layer 63. The SAP layer 63 has a liquid permeability of less than 30 (ml / min).

  Generally, in an absorber including SAP, the SAP closer to the wearer's skin absorbs a larger amount of urine. For this reason, after the absorber absorbs urine a plurality of times, the SAP closer to the wearer's skin swells and the liquid permeability is reduced, and the SAP inside the absorber and on the non-skin-facing surface side (lower side) It is difficult for the urine to enter, and there is a possibility that the urine flows on the skin-facing surface side of the absorber and leaks.

  When the absorbent body 6 according to the present embodiment is arranged in an absorbent article, the SAP layers 62L and 62R are located on the skin facing surface side, and the SAP layer 63 is located on the skin non-facing surface side. In other words, the SAP layer 63 is disposed more distally of the wearer's skin than the SAP layers 62L, 62R. In the absorber 6, the SAP layers 62L and 62R have higher liquid permeability than the SAP layer 63. For this reason, the absorber 6 ensures the liquid permeability of the SAP layers 62L and 62R arranged closer to the wearer's skin even after absorbing urine a plurality of times, and the inside of the base material 61 and the SAP layer The urine can easily enter the 63 and the leakage of the urine can be suppressed. Further, the absorbent body 6 has the SAP layers disposed on the front surface and the back surface of the base material 61, and the SAP necessary for absorbing and retaining a predetermined amount of liquid can be disposed separately in the SAP layers 62L, 62R, and 63. It is possible to prevent the density of the SAP in the SAP layers 62L, 62R, and 63 from becoming too high, and to prevent gel blocking from occurring. Furthermore, the absorber 6 can prevent the SAP in the SAP layers 62L, 62R, and 63 from becoming gel-like, and prevent the SAP layers 62L, 62R, and 63 from decreasing the liquid absorption and holding amount, thereby temporarily absorbing the SAP. It is possible to prevent the liquid from returning to the skin side of the wearer.

  Further, on the surface side (skin-facing surface side) of the base material 61, the SAP is not provided at the center in the width direction, and the SAP layers 62L and 62R are arranged on both sides in the width direction. The central part in the width direction on the surface side of the base material 61 is arranged at a position facing the urethral opening (hereinafter, referred to as “urethral opening facing position”) when the absorbent body 6 is arranged on the absorbent article. By not providing the SAP at the position facing the urethral opening in the absorber 6, the discharged urine can be introduced into the base material 61 and diffused throughout. Note that the SAP layer may be formed on the entire surface side of the base material 61. Even in this case, since the liquid permeability of the SAP layer disposed closer to the wearer's skin is large as described above, urine easily enters the inside of the base material 61 and the SAP layer 63 even in this case. Then, leakage of the urine can be suppressed.

Further, the absorbent body 6 includes a first nonwoven fabric sheet 65 arranged to cover the surface of the base material 61 and a second nonwoven fabric sheet 66 arranged to cover the back surface of the base material 61. Liquid permeable nonwoven fabric is used for the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. For example, an airlaid nonwoven fabric is used for the first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66. The first nonwoven fabric sheet 65 and the second nonwoven fabric sheet 66 diffuse the liquid in the width direction and the longitudinal direction of the absorber 6. Thereby, the absorber 6 prevents the liquid such as urine discharged by the wearer from being concentrated at the center in the width direction or the center in the longitudinal direction of the absorber 6. Further, by providing the first nonwoven fabric sheet 65, the wearer's feeling of wearing the absorbent article can be improved.

  Further, in the absorber 6, a groove may be formed in the base material 61. FIG. 3 is a plan view similar to FIG. FIG. 4 is a cross-sectional view cut along the BB cross section (cross section along the width direction of the absorber 6) shown in FIG. A groove 67 is formed on the front side of the base material 61 at the center in the width direction of the base material 61 and along the SAP layers 62L and 62R on both sides. The groove 67 is formed at a position facing the urethral opening so that the urine excreted by the wearer easily flows in when the absorbent body 6 is disposed in the absorbent article. The groove 67 is formed by pressing the groove forming region from the surface side of the base material 61 after the formation of the base material 61. In addition, the groove 67 may be formed by reducing the basis weight of the nonwoven fabric in the groove forming region when the base material 61 is manufactured.

  Thus, by providing the groove 67 on the surface side (skin-facing surface side) of the absorber 6, urine can be diffused in the entire longitudinal direction of the base material 61, and a large amount of urine is discharged. Even in this case, leakage of urine can be suppressed.

  Further, the absorbent body 6 has a core wrap sheet 68 covering the entire absorbent composite including the base material 61, the SAP layers 62L, 62R, 63, and the first nonwoven sheet 65 and the second nonwoven sheet. I have. FIG. 5 is a cross-sectional view of the absorber 6 similar to FIG. As shown in FIG. 5, the core wrap sheet 68 includes a first sheet 68 </ b> A covering the first nonwoven sheet 65 side, a width direction end of the first nonwoven sheet 65, a side surface of the base material 61, and a side of the second nonwoven sheet 66. And a second sheet 68B that covers the second sheet 68B. The first sheet 68A and the second sheet 68B are joined and integrated to entirely surround the absorbent composite. For the core wrap sheet 68, for example, a thin paper such as a liquid-permeable tissue paper or a nonwoven fabric is used. The core wrap sheet 68 can diffuse the liquid discharged by the wearer throughout the absorber 6. Note that the core wrap sheet 68 may be constituted by one sheet.

  Further, a compressed groove formed by compressing the core wrap sheet 68 and the first nonwoven fabric sheet 65 toward the surface of the base material 61 may be formed. FIG. 6 is a plan view of the absorber 6 as viewed from the first sheet 68a side of the core wrap sheet 68 shown in FIG. When the absorber 6 is arranged on the absorbent article, the first sheet 68a is arranged on the skin facing surface side. Compressed grooves 70 and 71 are formed on the surface of the first sheet 68a. The plurality of compression grooves 70 and 71 are formed in a straight line inclining with respect to the longitudinal direction of the absorber 6. A plurality of compression grooves 70 extend from the upper left to the lower right of the absorber 6 toward the paper surface, and are formed in parallel with each other. Further, a plurality of compression grooves 71 extend from the upper right to the lower left of the absorber 6 toward the paper surface and are formed in parallel with each other. The compressed groove 70 and the compressed groove 71 intersect at a substantially right angle. These compressed grooves 70 and 71 are formed in a lattice pattern as a whole. In addition, the formation pattern of the compressed grooves 70 and 71 is not limited to this, and may be formed, for example, to extend along the longitudinal direction of the absorber 6, or may be formed in a curved shape. .

  FIG. 7 is a cross-sectional view cut along the CC cross section (cross section along the width direction of the absorber 6) shown in FIG. The compressed grooves 70 and 71 are formed by compressing the core wrap sheet 68, the first nonwoven fabric sheet 65, and the base material 61. The compressed grooves 70 and 71 are formed at a depth reaching the surface of the absorber 6 to a part of the substrate 61. The absorber 6 allows air to flow into the compressed grooves 70 and 71 to improve liquid permeability. Further, since the liquid flows in the compressed grooves 70 and 71, the diffusibility of the liquid is improved. As described above, the compressed grooves 70 and 71 are provided to improve the liquid permeability and the liquid diffusibility of the absorber 6.

  The compressed grooves 70 and 71 are formed by compressing the core wrap sheet 68 and the first nonwoven fabric sheet 65 toward the surface of the base material 61 by passing the absorbent body 6 through a press roll having a convex lattice pattern. It is formed by processing. Here, when the SAP layer is formed on the surface of the base material 61, there is a possibility that the SAP may break the core wrap sheet or the nonwoven fabric sheet when performing the pressing from the surface side of the absorber 6. However, in the absorber 6 according to the present embodiment, the amount of SAP in the SAP layers 62L and 62R disposed on the surface side of the absorber 6 is reduced. This can prevent the SAP from breaking through the first nonwoven sheet 65 and the first sheet 68a of the core wrap sheet 68 when performing the pressing. The compressed grooves 70 and 71 are also formed on the center of the base 61 in the width direction on the surface of the base 61 where the SAP layer is not formed. When pressing the central portion in the width direction of the base material 61, since there is no SAP layer, the SAP does not break through the first nonwoven fabric sheet 65 or the first sheet 68a of the core wrap sheet 68. As described above, the absorber 6 according to the present embodiment can improve the yield when the squeezing process is performed.

<Absorptive article using absorber>
A tape-type disposable diaper shown in FIGS. 8 to 11 will be described as an example of an absorbent article using the absorbent body 6 described above. FIG. 8 is a perspective view of a tape-type disposable diaper (hereinafter, simply referred to as “diaper”) 1. The diaper 1 has a crotch region 1B that covers the genital area of the wearer in a wearing state, a front body region 1F located in front of the crotch region 1B, and a back body region 1R located behind the crotch region 1B. Tapes 2L and 2R that can be attached to a front patch 2F provided on the non-wearer side surface of the front body region 1F are provided on both left and right edges of the back body region 1R. Accordingly, when the diaper 1 has the front body region 1F arranged on the abdomen of the wearer and the back body region 1R arranged on the back of the wearer, the tapes 2L and 2R are attached to the front patch 2F. It is fixed to the wearer's body while surrounding the wearer's abdomen and thighs.

  In the diaper 1, an absorber capable of absorbing and retaining a liquid is disposed mainly around the crotch region 1B. The above-mentioned absorber 6 is used for the absorber. In addition, in the diaper 1, three-dimensional gathers 3BL, 3BR are provided at a portion surrounding the thigh of the wearer in order to suppress formation of a gap serving as a liquid outflow path between the diaper 1 and the skin of the wearer. Is provided, and a waist gather 3 </ b> R is provided in a portion surrounding the waist circumference of the wearer. The three-dimensional gathers 3BL and 3BR and the waist gathers 3R adhere to the wearer's skin by the elastic force of the thread rubber. Therefore, the liquid discharged from the wearer's genital area is absorbed by the absorber of the diaper 1 almost without leaking from the diaper 1.

  FIG. 9 is an exploded perspective view of the diaper 1. FIG. 10 is a cross-sectional view when the crotch region 1B is cut in the width direction. The diaper 1 has a cover sheet 4 that forms an outer surface in a mounted state. The cover sheet 4 is a sheet-shaped member having a substantially rectangular appearance in which the portions corresponding to the long sides are confined and provided with 4KL and 4KR. The constrictions 4KL and 4KR are provided at positions where the thighs of the wearer are located. The cover sheet 4 is provided to reinforce the back sheet 5 and improve the feel. For example, a non-woven fabric made of a liquid-impermeable thermoplastic resin may be used as the material for suppressing leakage of excrement. it can. Examples of the liquid-impermeable thermoplastic resin include polyethylene (PE) and polypropylene (PP).

The diaper 1 includes a back sheet 5, an absorber 6, and a top sheet 7 that are sequentially laminated on the surface of the cover sheet 4 on the wearer side. The back sheet 5, the absorber 6, and the top sheet 7 are all sheet-like members having a rectangular appearance, and are sequentially laminated on the cover sheet 4 in a state where the longitudinal direction matches the longitudinal direction of the cover sheet 4. . The back sheet 5, like the cover sheet 4, is a sheet formed of a liquid-impermeable thermoplastic resin as a material for suppressing leakage of excrement. The top sheet 7 is a sheet-like member that is arranged on the skin side of the wearer so as to cover the water absorbing surface (surface) of the absorber 6. The top sheet 7 has liquid permeability in part or all thereof. Therefore, in a state in which the diaper 1 is worn, the liquid excreted from the wearer enters the absorber 6 through the top sheet 7 that can come into contact with the skin of the wearer, and is absorbed there. For example, a woven fabric, a nonwoven fabric, and a porous film can be used as the material of the top sheet 7. Furthermore, the top sheet 7 may also have hydrophilicity.

  When the cover sheet 4 on which the back sheet 5, the absorber 6, and the top sheet 7 are laminated covers the genital area of the wearer, both ends of the back sheet 5, the absorber 6, and the top sheet 7 in the longitudinal direction are: The state is located on the wearer's abdomen and back. That is, the wearer's pubic region is covered with the absorber 6 from the wearer's abdomen to the back. Therefore, even if the wearer discharges the liquid out of the body in any of the posture with the belly facing down and the posture with the back facing down, the discharged liquid touches the absorber 6 via the top sheet 7. Will be.

  The diaper 1 also has elongated band-shaped side sheets 8L, 8R for forming the above-mentioned three-dimensional gathers 3BL, 3BR. The side sheets 8L and 8R are provided on the long sides of the top sheet 7. Similar to the three-dimensional gathers 3BL and 3BR of the diaper 1, the side sheets 8L and 8R are provided with constrictions 8KL and 8KR at the positions where the thighs of the wearer are located. The thread rubbers 8EL and 8ER are woven in the constrictions 8KL and 8KR along the longitudinal direction. Therefore, the constrictions 8KL and 8KR are drawn in the longitudinal direction by the contraction force of the thread rubbers 8EL and 8ER when the diaper 1 is in a worn state, that is, when the diaper 1 is in a U-shaped form in side view, and is thus pulled from the top sheet 7. It rises and becomes a three-dimensional gather that prevents the outflow of liquid.

  Further, the thread rubber 9ER for forming the above-mentioned waist gather 3R is provided between the back sheet 5 and the top sheet 7 at a position further back than the end of the absorber 6. The thread rubber 9ER is provided between the back sheet 5 and the top sheet 7 in a direction in which the longitudinal direction as the expansion and contraction direction is the left and right direction of the diaper 1. Therefore, when the tapes 2L and 2R provided on both the left and right sides of the thread rubber 9ER are adhered to the front patch 2F on the wearer's abdomen, the thread rubber 9ER exerts a contractive force to bring the diaper 1 to the wearer. This prevents the gap from being formed between the diaper 1 and the wearer's abdomen. Note that thread rubbers 9SL and 9SR for preventing a gap from being formed between the diaper 1 and the abdominal girth of the wearer are provided on both sides of the absorber 6 as well.

  As shown in FIGS. 1 to 7, the absorber 6 has SAP layers 62L, 62R, and 63 disposed on a base material 61 using a bulky nonwoven fabric.

  In the diaper 1 thus configured, when the liquid is excreted from the wearer, the discharged liquid comes into contact with the absorber 6 via the top sheet 7. And as mentioned above, the diaper 1 is provided with the SAP layer 63 containing a larger amount of SAP than the SAP layers 62L and 63R, thereby suppressing liquid leakage without lowering the overall liquid absorption and retention amount. it can. In addition, the diaper 1 is arranged farther from the SAP layer 62L and 62R than the SAP layer 62 arranged closer to the skin of the wearer by reducing the amount of the SAP than the SAP layer 63. The SAP layer 63 can absorb and hold a larger amount of liquid. Thereby, since the diaper 1 holds a relatively large amount of urine by the SAP layer 63 disposed distally from the wearer's skin, the feeling of wetness on the skin surface can be suppressed, and the decrease in the feeling of wearing can be suppressed. In addition, the diaper 1 has SAP layers disposed on the front surface and the back surface of the base material 61, and the SAP necessary for absorbing and holding a predetermined amount of liquid can be disposed separately in the SAP layers 62L, 62R, and 63. , SAP density in the SAP layers 62L, 62R, 63 can be prevented from becoming too high and gel blocking can be prevented from occurring. Further, the diaper 1 can prevent the SAP in the SAP layers 62L, 62R, and 63 from becoming gel-like, and once absorbed by preventing the decrease in the liquid absorption and holding amount in the SAP layers 62L, 62R, and 63. It is possible to suppress the liquid from returning to the skin side of the wearer.

  In addition, compressed grooves 70 and 71 may be formed in the absorber 6. The diaper 1 reduces the amount of SAP of the SAP layers 62L and 62R arranged on the skin-facing surface side of the absorber 6. This can prevent the SAP from breaking through the first nonwoven sheet 65 and the first sheet 68a of the core wrap sheet 68 when the absorbent body 6 is subjected to the pressing process. The compressed grooves 70 and 71 are also formed on the center of the base 61 in the width direction on the surface of the base 61 where the SAP layer is not formed. When pressing the central portion in the width direction of the base material 61, since there is no SAP layer, the SAP does not break through the first nonwoven fabric sheet 65 or the first sheet 68a of the core wrap sheet 68. As described above, the diaper 1 according to the present embodiment can improve the yield when the squeezing process is performed.

  The compressed grooves 70 and 71 may be formed by compressing a part of the top sheet 7, the first sheet 68a of the core wrap sheet 68, the first nonwoven fabric sheet 65, and the base material 61. FIG. 11 is a cross-sectional view when the crotch region 1B is cut in the width direction, similarly to FIG. The diaper 1 includes compression grooves 70 and 71 formed by compressing a part of the base material 61 of the absorber 6 from the top sheet 7. Note that the formation pattern of the compressed grooves 70 and 71 may be the same as the example shown in FIG. The diaper 1 includes the compressed grooves 70 and 71, so that liquid permeability and liquid diffusibility can be improved.

  In the above embodiment, the tape-type disposable diaper is illustrated, but the absorbent body 6 can be applied to other forms of absorbent articles. Examples of the absorbent article to which the absorbent body 6 can be applied include various types of absorbent articles with gathers, such as pants-type disposable diapers, urine pads, and light incontinence pads, and flat absorbent articles without gathers. Can be.

  In the above-described embodiment, the diaper 1 is described as an example. However, the above-described configuration and manufacturing method can be applied to other types of absorbent articles. Examples of the absorbent article to which the above-described configuration and manufacturing method are applicable include, for example, pants-type disposable diapers, tape-type disposable diapers, urine pads, various forms of absorbent articles with gathers such as light incontinence pads, and no gathers. A flat absorbent article can be mentioned.

1: Diapers (tape-type disposable diapers)
1F: front body region 1R: back body region 2F: front patch 2L: tape 2R: tape 3BL: solid gather 3BR: solid gather 3R: waist gather 4: cover sheet 5: back sheet 6: absorber 7: top sheet 8EL: Thread rubber 8ER: Thread rubber 8L: Side sheet 8R: Side sheet 9ER: Thread rubber 9SL: Thread rubber 9SR: Thread rubber 61: Base material 62L: SAP layer 62R: SAP layer 63: SAP layer 65: First non-woven sheet 66: Second nonwoven fabric sheet 67: groove 68: core wrap sheet 70: compressed groove 71: compressed groove

Claims (7)

A substrate formed of non-woven fabric and permeable to liquid,
An upper SAP layer disposed on the surface of the base material and including particles of a superabsorbent polymer, SAP;
A lower SAP layer that is disposed on the back surface of the base material and that includes particles of SAP that is a superabsorbent polymer;
With
The upper SAP layer, the rather small amount of SAP than the lower SAP layer,
The upper SAP layer has a higher liquid permeability than the lower SAP layer;
Absorber. The upper SAP layer is arranged on both sides in the width direction along the center in the width direction of the substrate, and extends in the longitudinal direction of the substrate.
On the surface side of the base material, a groove is formed at the center in the width direction, and along the upper SAP layer on both sides.
The absorber according to claim 1. A first nonwoven fabric sheet arranged to cover the surface of the base material,
A second nonwoven fabric sheet arranged to cover the back surface of the base material,
Comprises, absorbent body according to claim 1 or 2. 4. A core wrap sheet covering an outer periphery of an absorbent composite including the base material, the upper SAP layer, the lower SAP layer, the first nonwoven sheet, and the second nonwoven sheet. 5 . The absorbent body as described in the above. The absorbent body according to claim 4 , further comprising: a compressed groove formed by compressing the core wrap sheet, the first nonwoven fabric sheet, and the base material. An absorbent article that absorbs a liquid discharged by a wearer,
A liquid-impermeable backsheet,
A liquid-permeable topsheet bonded to the backsheet,
The absorber according to any one of claims 1 to 5 , which is arranged between the back sheet and the top sheet,
An absorbent article comprising: The absorbent article according to claim 6 , further comprising: a compressed groove formed by compressing a part of the base material of the absorber from the top sheet.

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