JP2021007680A - Absorbent article - Google Patents

Abstract

To provide an absorbent article capable of suppressing turnaround.SOLUTION: An absorbent article includes: a liquid-permeable top sheet arranged on a skin facing surface side at a fitting time; a liquid-impermeable back sheet arranged on the opposite side to the skin facing surface; an upper layer absorber positioned between the back sheet and the top sheet, containing a highly absorbent polymer, and arranged on the top sheet side; a lower layer absorber positioned between the back sheet and the top sheet, and arranged on the back sheet side; a groove formed through the upper layer absorber in a thickness direction, extending in a longer direction of the upper layer absorber, and formed on a width direction center part of the upper layer absorber; and a SAP layer positioned between the upper layer absorber and the lower layer absorber, and containing a plurality of particles of the highly absorbent polymer arranged on both sides of the grove, along a longer direction of the groove. A position of a rear end of the groove is a position of 87.5 mm or more from a narrow width area central part to a back body area side.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

Absorbent articles such as disposable diapers, absorbent pads (urine pads), and sanitary napkins are known. The absorbable article is formed of a pulp or a super absorbent polymer (SAP), and includes an absorber that absorbs a liquid such as urine or body fluid. Patent Document 1 describes an absorbent article comprising an upper layer absorber and a lower layer absorber and having an opening (groove) formed in the upper layer absorber.

International Publication No. 2016/114209

By the way, in the absorbent article, there is a problem that the liquid once absorbed by the absorber returns to the skin side of the wearer. The above-mentioned Patent Document 1 does not disclose the position and width of the groove capable of suppressing the reversion that occurs in the absorbent article. If the urine cannot be diffused due to the groove in the absorbent article, there is a risk of reversion.

Therefore, an object of the present invention is to provide an absorbent article capable of suppressing reversion.

In order to solve the above problems, in the absorbent article according to the present invention, the position of 87.5 mm or more from the central portion of the gourd-shaped narrow region of the upper layer absorber to the rear body region side is defined as the rear end portion of the groove.

More specifically, the present invention is an absorbent article that includes an absorption region that includes a front body region located on the abdominal side of the wearer, an inseam region located on the inseam, and a back body region located on the back side when worn. A liquid-permeable top sheet arranged on the skin-facing surface side when worn, a liquid-impermeable back sheet arranged on the opposite side of the skin-facing surface, and the back sheet and the above. Between the top sheet and the upper layer absorber containing the highly absorbent polymer and arranged on the top sheet side, and between the back sheet and the top sheet, arranged on the back sheet side. A groove formed by penetrating the upper layer absorber in the thickness direction, extending in the longitudinal direction of the upper layer absorber, and formed in the central portion in the width direction of the upper layer absorber. A SAP layer between the upper layer absorber and the lower layer absorber and containing a plurality of highly absorbent polymer particles arranged along the longitudinal direction of the groove and on both sides of the groove is provided. The upper layer absorber has a gourd shape in a top view, and the groove extends from the central portion of the gourd-shaped narrow region of the upper layer absorber to the front body region side by 165 mm or more and 215 mm or less. The urinary ostium corresponding region exists in a range of 100 mm or more and 160 mm or less from the tip of the groove on the front body region side, and the groove in the urinary ostium corresponding region has a width of 15 mm or more and 40 mm or less and the urinary tract. The groove does not extend on the front body region side of the mouth-corresponding area, and the groove extends on the back body region side of the urinary tract mouth-corresponding region. The width is 15 mm or more and 40 mm or less, the position of the rear end portion of the groove is a position of 87.5 mm or more from the central portion of the narrow region to the rear body region side, and the lower layer absorber contains pulp. Including, the lower layer absorber has a density of 0.06 g / cm ³ or less, 62.5 mm or more and 72.5 mm or less from the center of the absorbent article in the width direction, and the rear body from the central portion of the narrow region. 168 mm or more on the area side 1
A region of 88 mm or less is a predetermined region on which a load is relatively easily applied, the SAP layer is arranged so as to include the predetermined region, and the amount of SAP in the SAP layer in the predetermined region is 4.2 g or more. The basis weight of SAP in the upper layer absorber is 250 g / m ² or more and 300 g / m ² or less.

In the above-mentioned absorbent article, the lower layer absorber contains a highly absorbent polymer, and the total amount of SAP contained in the upper layer absorber, the SAP layer and the lower layer absorber in the predetermined region is 14 g or more. You may.

In the absorbent article, the groove may have a width of 10 mm or more and 50 mm or less in the back body region than the urethral meatus corresponding region.

In the absorbent article, the width of the absorber in the region including the predetermined region may be wider than the width of the region not including the predetermined region.

With the above-mentioned absorbent article, reversion can be suppressed.

FIG. 1 is a plan view of the absorbent pad. FIG. 2 is a cross-sectional view of the absorbent pad. FIG. 3 is a table showing the results of the reversion amount measurement test of the absorbent pad.

Hereinafter, embodiments of the present invention will be described. The embodiments shown below are examples of embodiments of the present invention, and the technical scope of the present invention is not limited to the following embodiments.

FIG. 1 is a plan view of the absorbent pad 1 (an example of the “absorbent article” referred to in the present application) according to the present embodiment as viewed from the skin facing surface side. The absorbent pad 1 is used to absorb and retain a liquid such as urine, and can be used alone or stacked on the inside of a disposable diaper. The absorbent pad 1 includes a front body region 3 located on the abdomen side of the wearer, an inseam region 5 located on the inseam, and a back body region 7 located on the back side when worn. The absorbent pad 1 is divided into a front body region 3, an inseam region 5, and a back body region 7 when viewed in the longitudinal direction. The direction orthogonal to the longitudinal direction is the width direction (short direction) of the absorbent pad 1. The absorbent pad 1 has the narrowest width in the inseam region 5 in the top view (planar view), and the inseam region 5 has a constricted gourd shape.

In the following, when the absorbent pad 1 is viewed in the longitudinal direction, the front body region 3 side is referred to as "front", "front side", "front", and "abdominal side", and is relatively rear. The body area 7 side is called "rear", "rear side", "rear", or "back side", and the left side is relatively left from the rear side to the front side as "left", "left side", or "left side". The right side is referred to as "right", "right side", or "right side" from the rear side to the front side. The front-rear direction of the absorbent pad 1 is the longitudinal direction, and the left-right direction of the absorbent pad 1 is the width direction. Further, the direction orthogonal to the front-back and left-right directions is the thickness direction (height direction) of the absorbent pad 1.

As shown in FIG. 1, the absorbent pad 1 includes a top sheet 11 arranged on the skin-facing surface side when worn (wearing state). The top sheet 11 is a portion (skin facing surface) that comes into contact with the wearer's skin when the absorbent pad 1 is worn, and is made of a liquid-permeable material that allows liquids such as urine to permeate. Specifically, a woven fabric, a non-woven fabric, a porous film, or the like is used for the top sheet 11. The non-woven fabric includes polypropylene, polyethylene, polyester, etc.
Fibers of a thermoplastic resin such as nylon may be hydrophilized, or an air-through non-woven fabric, a point-bonded non-woven fabric, a spun-bonded non-woven fabric, a melt-blown non-woven fabric, or the like may be used.

Further, the absorbent pad 1 includes a back sheet 13 arranged on the opposite side of the skin-facing surface when worn. The back sheet 13 is a portion that is a non-skin facing surface (outer surface) opposite to the skin facing surface, and is made of a liquid-impermeable material that does not allow liquids such as urine to permeate. Specifically, a liquid-impermeable film made of polyethylene resin is used for the back sheet 13. The back sheet 13 is made of microporous polyethylene in which a plurality of fine holes of 0.1 to 4 μm are formed in order to obtain air permeability for preventing stuffiness in the mounted state while maintaining liquid impermeableness. It is preferable to use a film.

The peripheral portions of the top sheet 11 and the back sheet 13 are joined to each other. Further, the absorbent pad 1 is arranged between the top sheet 11 and the back sheet 13 and includes an absorbent body 14 that absorbs a liquid such as urine. The absorber 14 has an upper layer absorber 15 arranged on the top sheet 11 side and a lower layer absorber 17 arranged on the back sheet 13 side. The upper layer absorber 15 has substantially the same gourd shape as the absorbent pad 1 when viewed from above. The lower layer absorber 17 is arranged below the upper layer absorber 15 when viewed from the top sheet 11 side, and has a rectangular shape having a long side in the longitudinal direction of the absorbent pad 1 when viewed from above. Further, in the top view, the upper layer absorber 15 is formed larger than the lower layer absorber 17. The absorbent pad 1 is relatively large when a liquid such as urine is excreted, and the upper layer absorber 15 arranged on the top sheet 11 side can rapidly absorb urine. The longitudinal direction of the absorber 14 is the longitudinal direction of the upper layer absorber 15 and the lower layer absorber 17, and coincides with the longitudinal direction of the absorbent pad 1. Further, the width direction of the absorber 14 is the width direction of the upper layer absorber 15 and the lower layer absorber 17, and coincides with the width direction of the absorbent pad 1.

The upper layer absorber 15 and the lower layer absorber 17 are a combination of fluff pulp obtained by crushing a fiber material such as softwood, a super absorbent polymer (SAP), a hydrophilic sheet, and the like. Things are used. In addition, SAP absorbs about 10 to 100 times its own weight of liquid. As the SAP, for example, a granular one having a diameter of about 0.1 to 0.5 mm in a state before liquid absorption is used.

In the absorbent pad 1 according to the present embodiment, the upper layer absorber 15 contains SAP. The lower layer absorber 17 may also contain SAP. In the absorbent pad 1 according to the present embodiment, the upper layer absorber 15 arranged on the skin facing surface side contains SAP, so that the liquid such as urine once absorbed is surely held and the reversion is suppressed.

Further, the absorbent pad 1 includes a groove 21 formed by penetrating the upper layer absorber 15 in the thickness direction. The groove 21 includes the urethral meatus corresponding region 37 (the region indicated by hatching to the right in FIG. 1) on the top sheet side (upper layer absorber 15) of the absorber 14 and extends in the longitudinal direction of the absorber 14 and the absorber 14 It is formed in the central part in the width direction of. The details of the urethral meatus area 37 will be described later.

Further, the groove 21 extends from the central portion of the gourd-shaped narrow region of the absorber 14 to the front body region 3 side and the rear body region 7 side. Here, the gourd-shaped narrow region central portion of the absorber 14 is a longitudinal central portion in the narrow region 5a, which is the narrowest region in the inseam region 5 of the upper layer absorber 15. is there. In FIG. 1, the central portion of the narrow region is indicated by a virtual straight line c1 represented by a two-dot chain line. When the narrowest portion of the absorber 14 is defined in a substantially linear shape in the top view, this portion is defined as the central portion of the narrow region. The central portion of the narrow region is located at the lowermost position in the absorber 14 when the wearer stands up when the absorbent pad 1 is worn in the normal usage mode.

The groove 21 has a length y1 from the central portion of the narrow region to the front body region 3 side. In the present embodiment, the length y is 165 mm or more and 215 mm or less. As described above, the groove 21 extends from the central portion of the gourd-shaped narrow region of the absorber 14 to the front body region 3 side by 165 mm or more and 215 mm or less.

Further, the groove 21 extends from the central portion of the gourd-shaped narrow region of the absorber 14 to the rear body region 7 side. The groove 21 has a length y2 from the central portion of the narrow region to the rear body region 7 side. In this embodiment, the length y2 is 87.5 mm or more. In the present embodiment, it is necessary to prevent urine passing through the groove 21 from leaking from the dorsal end of the absorber 14 from the urination rate of 150 ml / time (one urination volume for an adult) and 10 ml / s sec. The length y2 is specified. Urine is absorbed from the bottom surface of the groove 21 to the lower layer absorber 17 and further from the side surface of the groove 21 to the upper layer absorber 15, and the urine reaching the back side end of the absorber 14 gets over the wall surface of the end. A length y2 that is less than or equal to the amount to be determined is specified.

Here, the urethral meatus corresponding region 37 exists in a range of 100 mm or more and 160 mm or less from the tip portion of the groove 21 on the front body region 3 side. The tip of the groove 21 on the front body region 3 side coincides with the tip of the urethral meatus region 37 on the front body region 3 side. The urethral meatus-corresponding area 37 is an area where the wearer's urethral meatus abuts on the top sheet 11 and is a urination position. The groove 21 is formed including the urethral meatus corresponding region 37 so that the urine excreted by the wearer can easily flow in. The urethral meatus corresponding area 37 is defined in consideration of individual differences in the position of the urethral meatus of the wearer, gender differences, and minute misalignment of the absorbent pad 1 that occurs for each wearer. In this embodiment, the urethral meatus corresponding area 37 is defined by collecting statistics on the contact positions between the urethral meatus and the absorbent pad of 15 adult males and 15 adult females.

Since the absorbent pad 1 according to the present embodiment is provided with the groove 21 in the urethral meatus corresponding region 37, the urine discharged from the urethra in the urethral meatus corresponding region 37 is not passed through the upper layer absorber 15 but is a lower layer absorber. 17 can be reached. As a result, the absorbent pad 1 can hold urine by the lower layer absorber 17 arranged at a position relatively far from the wearer's skin, so that reversion can be suppressed.

In addition, if the width of the groove is too narrow in the area corresponding to the urethral meatus, urine overflows from the groove, and the groove cannot diffuse urine to the entire absorber, and urine leaks from the side of the absorbent article. Will occur. Therefore, in the present embodiment, the required width of the groove 21 in the urethral meatus corresponding region 37, which is the urination position, is set. The width of the groove 21 is generally set based on the amount and rate of urination of an adult in need of care at one time. The amount of urination is 150 ml, and the rate of urination is 10 ml / sec. The groove 21 in the urethral meatus contact area 37 is primarily a space for receiving urine, and in the present embodiment, the width x of the groove 21 in the urethral meatus contact area 37 is determined from the conditions required in this space. I set it. In the present embodiment, the width x of the groove 21 in the urethral meatus corresponding region 37 is set to 15 mm or more and 40 mm or less. The groove 21 in the urethral meatus corresponding region 37 functions as a space for receiving urine, and the discharged urine can flow into the groove 21 and diffuse throughout the absorber 14.

Further, the depth of the groove 21 in the urethral meatus corresponding region 37 is also set from the conditions required in the space for receiving urine. In the present embodiment, the groove 21 in the urethral meatus corresponding region 37 has a depth of 6 mm or more and 10 mm or less.

Further, the groove 21 does not extend on the front body region 3 side of the urethral meatus corresponding region 37. If the amount of the absorbent article is too diffused toward the front body region, urine overflows from the groove in the front body region, and the absorber in the front body region cannot absorb the urine, resulting in lateral leakage. There is a risk that it will end up. In the present embodiment, the tip of the groove 21 on the front body region 3 side and the tip of the urethral meatus corresponding region 37 on the front body region 3 side are aligned with each other so as to be closer to the front body region 3 than the urethral meatus corresponding region 37. The groove 21 is not formed. As a result, the absorbent pad 1 according to the present embodiment can suppress lateral leakage of urine by diffusing urine from the tip end portion of the groove 21 to the back body region 7 side.

Further, the groove 21 on the back body region 7 side of the urethral meatus corresponding region 37 has a width of 10 mm or more and 50 mm or less and a depth of 5 mm or more and 9 mm or less. The groove 21 on the back body region 7 side of the urethral meatus corresponding region 37 may be narrower in width or shallower than the groove 21 in the urethral meatus corresponding region 37.

The absorbent pad 1 according to the present embodiment allows urine to flow into the groove 21 and diffuses toward the back body region 7 side of the urethral meatus corresponding region 37. As a result, the absorbent pad 1 according to the present embodiment is absorbed by the absorber 14 on the back body region 7 side of the urethral meatus corresponding region 37, and urine flows to the front body region 3 side of the urethral meatus corresponding region 37. By preventing it from leaking, it is possible to prevent urine from leaking from the abdominal side.

Further, the absorbent pad 1 has SAP layers 23L and 23R arranged between the upper layer absorber 15 and the lower layer absorber 17. The SAP layers 23L and 23R are formed by aggregating a plurality of particles of a highly absorbent polymer (SAP). The SAP layers 23L and 23R contain a plurality of SAP particles, and can absorb and retain the liquid guided between the upper layer absorber 15 and the lower layer absorber 17. As shown in FIG. 1, the SAP layer 23L is arranged on the left side of the groove 21, and the SAP layer 23R is arranged on the right side of the groove 21. As described above, the SAP layers 23L and 23R are arranged on both sides of the groove 21 so as to be along the longitudinal direction of the groove 21. Further, in the top view, the SAP layers 23L and 23R are formed in a rectangular shape. The SAP layers 23L and 23R may be formed in a polygonal shape or an elliptical shape instead of a rectangular shape in a top view.

The basis weight of SAP in the SAP layers 23L and 23R is 100 g / m ² or more and 200 g / m ² or less. The amount of urine retained in the SAP layers 23L and 23R is 130 g or more and 350 g or less. As a result, the absorbent pad 1 according to the present embodiment can hold about 600 ml of urine in the entire SAP layers 23L, 23R and the absorber 14.

The SAP layer 23L is arranged from the outside by w1 mm from the left end of the groove 21 to the inside by w2 mm from the left end of the upper layer absorber 15. Similarly, the SAP layer 23R is arranged from the outside w1 mm from the right end portion of the groove 21 to the inside w2 mm from the right end portion of the upper layer absorber 15. As described above, the SAP layers 23L and 23R are arranged from the outside of w1 mm from both ends of the groove 21 to the inside of w2 mm from the end in the width direction of the upper layer absorber 15. w1 mm is, for example, 10 mm, and w2 mm is, for example, 10 mm. The SAP layers 23L and 23R are arranged outside the groove 21 in the width direction. The absorbent pad 1 according to the present embodiment includes the SAP layers 23L and 23R arranged outside the width direction of the 21 so that urine can be held in a region not adjacent to the groove 21 and the absorber 14 can hold the urine. It is possible to prevent urine from returning to the groove due to pressure such as a load from the wearer. Further, in order to obtain this effect more, in the absorbent pad 1, the SAP layers 23L and 23R may have a larger amount of SAP as the region closer to the groove 21. Further, in the absorbent pad 1, the width of the absorber 14 in the region including the predetermined regions 38L and 38R is wider than the width of the region not including the predetermined regions 38L and 38R. In the present embodiment, as shown in FIG. 1, the predetermined regions 38L and 38R are defined in the back body region 7, and the absorber 14 (upper layer absorber) in the back body region 7 including the predetermined regions 38L and 38R. 15) is wider than the width of the front body region 3 and the inseam region 5 that do not include the predetermined regions 38L and 38R. The absorbent pad 1 applies body pressure to the predetermined regions 38L and 38R by making the width of the absorber 14 in the region including the predetermined regions 38L and 38R wider than the width of the region not including the predetermined regions 38L and 38R. Even if the urine is squeezed out
Urine can be absorbed by the absorber 14 outside the predetermined regions 38L and 38R in the width direction to prevent reversion. In the absorbent pad 1, the SAP layers 23L and 23R may be provided on the outer sides of the predetermined regions 38L and 38R in the width direction. According to such a configuration, even if body pressure is applied to the predetermined regions 38L and 38R and urine is squeezed out, the SAP layers 23L and 23R outside the predetermined regions 38L and 38R in the width direction absorb the urine and revert. Can be prevented.

Further, as described above, the SAP layers 23L and 23R are arranged w1 mm outside from both ends of the groove 21. In other words, the SAP layer containing a plurality of highly absorbent polymer particles is not formed in the adjacent region of the groove 21. If the SAP particles spill into the groove, the SAP particles may absorb urine and swell to block the groove. The absorbent pad 1 according to the present embodiment has a width w1 of 10 mm or more in order to prevent SAP particles from spilling into the groove 21.

Further, the SAP layers 23L and 23R are longer than the groove 21, and the length in the longitudinal direction of the groove 21 is included in the length of the SAP layers 23L and 23R in the longitudinal direction. When the absorbent pad 1 is an adult urine absorbing pad, the widths of the SAP layers 23L and 23R are 43 mm to 45 mm, and the lengths of the SAP layers 23L and 23R are 470 mm to 555 mm.

As described above, the absorbent pad 1 according to the present embodiment includes an upper layer absorber 15, a lower layer absorber 17, a groove 21, and SAP layers 23L and 23R. The longitudinal directions of the upper layer absorber 15, the lower layer absorber 17, the groove 21, and the SAP layers 23L and 23R are the same. Further, the groove 21 and the SAP layers 23L and 23R are arranged substantially parallel to each other.

Further, it is a1 mm or more and a2 mm or less from the center of the absorbent pad 1 in the width direction (indicated by the virtual straight line c2 represented by the alternate long and short dash line in FIG. The regions from b1 mm or more and b2 mm or less on the back body region 7 side from (indicated by the straight line c1) are predetermined regions 38L and 38R (regions shown by hatching downward to the right in FIG. 1) where a load is relatively easily applied. Here, in the present embodiment, a1 is 62.5 mm, a2 is 72.5 mm, b1 is 168 mm, and b2 is 188 mm. In the present embodiment, the predetermined regions 38L and 38R have a rectangular shape of 20 mm in the longitudinal direction of the absorbent pad 1 and 10 mm in the width direction of the absorbent pad 1. The predetermined areas 38L and 38R are areas in which urine is easily squeezed out by being particularly compressed by the protrusion (bone portion) of the wearer's buttocks. The predetermined areas 38L and 38R were derived by collecting statistics of 30 people. The SAP layers 23L and 23R are arranged so as to include predetermined regions 38L and 38R. The amount of SAP in the SAP layers 23L and 23R in the predetermined regions 38L and 38R is 4.2 g or more. As a result, the absorbent pad 1 can prevent urine from returning from the predetermined regions 38L and 38R. The absorption performance of SAP is 60 ml / g.

Further, the basis weight of SAP in the upper layer absorber 15 is 250 g / m ² or more and 300 g / m ² or less. This is the amount of SAP required for the upper layer absorber 15 to retain urine that has reached a region other than the predetermined regions 38L and 38R and suppress the reversion of urine, and the upper layer absorber 15 is within the predetermined regions 38L and 38R. This is the amount of SAP required to retain the urine squeezed from the lower absorber 17 and the SAP layers 23L and 23R.

The lower layer absorber 17 may contain SAP. In the predetermined regions 38L and 38R, the total amount of SAP contained in the upper layer absorber 15, the SAP layer 23L and 23R and the lower layer absorber 17 is 14 g or more. As a result, the absorbent pad 1 can suppress the reversion of urine.

Further, in the absorbent pad 1, three-dimensional gathers (not shown) are arranged along the left and right ends of the lower layer absorber 17 when viewed from the skin facing surface side. The three-dimensional gather is joined to the top sheet 11 to suppress lateral leakage of the liquid.

FIG. 2 is a cross-sectional view of the absorbent pad 1 shown in FIG. 1 cut along the line AA. In FIG. 2, in order to make each component of the absorbent pad 1 easy to understand, a gap is provided between the components, but in reality, a gap is not substantially formed between the components. ..

As shown in FIG. 2, the absorbent pad 1 according to the present embodiment includes a core wrap sheet 30 (not shown in FIG. 1) that encloses the entire absorber 14. The core wrap sheet 30 has an upper layer sheet 31 arranged on the upper layer absorber 15 side and a lower layer sheet 33 arranged on the lower layer absorber 17 side. The upper layer sheet 31 is arranged between the top sheet 11 and the upper layer absorber 15, and the lower layer sheet 33 is arranged between the back sheet 13 and the lower layer absorber 17. Further, the lower layer sheet 33 has a portion that covers the side surface portions of the upper layer absorber 15 and the lower layer absorber 17, and is routed between the top sheet 11 and the upper layer absorber 15, and is routed to the top sheet 11 and the upper layer absorber 15. It is joined to the upper layer sheet 31 with the upper layer absorber 15. In this way, the upper layer sheet 31 and the lower layer sheet 33 are joined to each other and integrated, and enclose the entire upper layer absorber 15 and the lower layer absorber 17. For the upper layer sheet 31 and the lower layer sheet 33, for example, thin paper such as tissue paper, non-woven fabric, or the like is used. The upper layer sheet 31 and the lower layer sheet 33 may be integrally formed, or may be joined to the side surfaces of the upper layer absorber 15 and the lower layer absorber 17, or between the back sheet 13 and the lower layer absorber 17. You may.

The SAP layers 23L and 23R are formed by spraying SAP particles on the lower layer absorber 17. Further, the SAP layers 23L and 23R are sandwiched between the upper layer absorber 15 and the lower layer absorber 17. Therefore, even if the absorbent pad 1 is moved by the movement of the wearer, the SAP particles contained in the SAP layers 23L and 23R may move below the groove 21 or fall out of the lower layer absorber 17. Can be prevented.

Further, by arranging the SAP layers 23L and 23R between the upper layer absorber 15 and the lower layer absorber 17, the urine once absorbed by the pulp of the lower layer absorber 17 due to the capillary phenomenon is moved to the SAP layers 23L and 23R. Can be done. As a result, the absorbent pad 1 can suppress the leakage of urine by retaining the urine in the SAP layers 23L and 23R having higher urine retention.

As described above, the absorbent pad 1 according to the present embodiment is viewed from the skin facing surface side in the thickness direction, the top sheet 11, the upper layer sheet 31, a part of the lower layer sheet 33, the upper layer absorber 15, and the SAP layer 23L. , 23R, the lower layer absorber 17, a part of the lower layer sheet 33, and the back sheet 13 in this order. Further, by joining the peripheral portions of the top sheet 11 and the back sheet 13 to each other, the upper layer sheet 31, the lower layer sheet 33, the upper layer absorber 15, the SAP layers 23L, 23R and the lower layer absorber 17 become the top sheet 11 and the back. The circumference is surrounded by the sheet 13 and sealed.

Further, in the present embodiment, the lower layer absorber 17 and pulp are contained, and the density is 0.06 g / cm ³ . In the absorbent pad 1, the urine that has reached the lower absorber 17 is diffused by the lower absorber 17 and retained by the SAP layers 23L and 23R, and the urine that cannot be retained by the SAP layers 23L and 23R is retained by the upper absorber 15. Hold with. As a result, the absorbent pad 1 can suppress the reversion of urine squeezed out from the upper layer absorber 15 by reducing the amount of urine held by the upper layer absorber 15.

By the way, in the absorbent pad described in Patent Document 1, a penetrating groove that penetrates the upper layer absorber and the lower layer absorber in the thickness direction is formed. However, in the absorbent pad, the length and width of the urethral meatus-corresponding region and the groove from the urethral meatus-corresponding region are not specified. Therefore, in the absorbent pad, a liquid such as urine may flow through the groove to the abdominal side in an amount exceeding the amount absorbed by the abdominal absorber, and the urine may reach the lower absorber. It cannot be done and there is a risk that urine will return. On the other hand, since the absorbent pad 1 according to the present embodiment forms the groove 21 so as to include the urethral meatus corresponding region 37, urine can reach the lower layer absorber 17 and the reversion of urine can be suppressed. ..

Next, the reversion suppressing effect of the absorbent pad 1 according to the present embodiment was evaluated by a reversion amount measurement test (hereinafter referred to as "test"). The preparations in the test are an adult strike-through plate (15 cm x 15 cm), a weight (20 kg), an electronic balance, a polycup, an acrylic plate (10 cm x 10 cm), artificial urine and filter paper (10 cm x 10 cm). Artificial urine was prepared by dissolving 20 g of urea, 8 g of sodium chloride, 0.8 g of magnesium sulfate heptahydrate, and 0.3 g of calcium chloride dihydrate in 1000 mL of distilled water. The strike-through plate has a square plate-like shape, and a circular hole is formed in the center. The hole diameter of the strike-through plate is 54 mm, the thickness of the strike-through plate is 8 mm, and the weight of the strike-through plate is 1253.2 g. In addition, about 70 g of filter papers are prepared in a bundle in one test. In this preparatory stage, the weight of the filter paper bundle is measured with an electronic balance.

Next, the absorbent pad is spread and fixed in a wrinkle-free state. Gum tape or hook tape is used for fixing. The absorbent pad is fixed so that the back body region faces the operator side.

Next, a mark is written in the center of the upper groove of the absorbent pad in the longitudinal direction with an oil-based pen or the like. The strike-through plate is placed on the absorber pad so that the mark is located in the center of the hole in the strike-through plate. Next, the artificial urine is measured with an electronic balance, and 150 ml of artificial urine is prepared. The prepared artificial urine is poured into a polycup, and 150 ml of artificial urine is injected toward the mark on the absorbent pad. When the absorbent pad has absorbed all the artificial urine, remove the strike-through plate from the absorbent pad. The time when all the artificial urine poured into the absorbent pad disappears from the top sheet is the time when the absorbent pad absorbs all the artificial urine. 9 minutes and 30 seconds after the first artificial urine injection into the absorbent pad, a strike-through plate was placed on the absorbent pad in the same manner as above, and 10 minutes after the first artificial urine injection, 150 ml of artificial urine was again added to the above. Similarly inject into the absorbent pad. This step is repeated once more, and 150 ml of artificial urine is injected into the absorbent pad in three divided doses. This injects a total of 450 ml of artificial urine into the absorbent pad.

Ten minutes after injecting artificial urine into the absorbent pad for the third time, 70 g of a filter paper bundle, an acrylic plate, and a weight are placed in the order of marking on the absorbent pad to pressurize the absorbent pad. As a result, the filter paper bundle absorbs artificial urine. Then, after 5 minutes, the acrylic plate and the weight are removed from the absorbent pad, and the weight of the filter paper bundle is measured with an electronic balance. The amount of artificial urine absorbed by the filter paper bundle is the amount of reversion. The amount of reversion is measured by subtracting the weight of the filter paper bundle in the preparatory stage from the weight of the filter paper bundle after absorption of artificial urine. If the top filter paper of the filter paper bundle is wet with artificial urine, the amount of reversion exceeds the upper limit of the absorption amount of the entire filter paper bundle, and the accurate amount of reversion cannot be measured. Increase the number of sheets and repeat the above test. When the amount of reversion is 45 g or less, it is assumed that reversion is suppressed.

FIG. 3 is a table showing the test results of the absorbent pad 1 according to the present embodiment and the absorbent pad 1 according to the comparative example. As shown in FIG. 3, 11 absorbent pads in which the length of the groove from the central portion of the narrow absorber region to the back body region side was set at intervals of 5 mm from 85 mm to 90 mm were prepared and tested. The table of FIG. 3 shows the items of "the length of the groove from the central portion of the narrow region to the rear body region side (mm)" and "the amount of reversion (g)" from the right.

Here, in the absorbent pad 1 according to the present embodiment, the position of the rear end portion of the groove 21 is a position of 87.5 mm or more from the central portion of the narrow region to the rear body region side, and the absorbent property according to the comparative example. In the pad, the position of the rear end portion of the groove is a position shorter than 87.5 mm and 87 mm or less from the central portion of the narrow region to the rear body region side. As shown in FIG. 3, in the absorbent pad 1 according to the present embodiment, that is, when the length of the groove from the central portion of the narrow region to the back body region side is 87.5 mm or more, the amount of reversion is large. The weight was 45 g or less, and the reversion could be suppressed. In the absorbent pad according to the comparative example, that is, when the length of the groove from the central portion of the narrow region to the back body region side is 87.0 or less, the amount of reversion is larger than 45 g and the reversion is suppressed. I couldn't. As described above, the absorbent pad 1 according to the present embodiment can suppress the reversion of a liquid such as urine.

In the above embodiment, the absorbent pad 1 has been exemplified, but the above configuration can be applied to other forms of absorbent articles. As absorbent articles to which the above configuration can be applied, for example, various forms of absorbent articles with gathers such as pants-type disposable diapers, tape-type disposable diapers, urine pads, and light incontinence pads, and flat absorption without gathers. Sexual articles can be mentioned.

1 ・ ・ Absorbent pad: 3 ・ ・ Front body area: 5 ・ ・ Inseam area: 7 ・ ・ Back body area: 11 ・ ・ Top sheet: 13 ・ ・ Back sheet: 15 ・ ・ Upper layer absorber: 17 ・ ・ Lower layer Absorber: 21 ... Groove: 23L ... SAP layer: 23R ... SAP layer: 31 ... Core wrap sheet: 30 ... Core wrap sheet: 31 ... Upper sheet: 33 ... Lower sheet: 37 ... Urethra Mouth-corresponding area: 38L ... Predetermined area: 38R ... Predetermined area

Claims (4)

An absorbent article having a front body area located on the abdomen side of the wearer, an inseam area located on the inseam side, and a back body area located on the back side when worn.
A liquid-permeable top sheet placed on the side facing the skin when worn,
A liquid-impermeable back sheet arranged on the opposite side of the skin-facing surface and
Between the back sheet and the top sheet, an upper layer absorber containing a highly absorbent polymer and arranged on the top sheet side,
Between the back sheet and the top sheet, a lower layer absorber arranged on the back sheet side,
A groove formed by penetrating the upper layer absorber in the thickness direction, extending in the longitudinal direction of the upper layer absorber, and formed in the central portion in the width direction of the upper layer absorber.
An SAP layer between the upper layer absorber and the lower layer absorber, which contains a plurality of particles of a highly absorbent polymer arranged along the longitudinal direction of the groove and on both sides of the groove.
With
The upper layer absorber has a gourd shape when viewed from above, and has a gourd shape.
The groove extends from the central portion of the gourd-shaped narrow region of the upper layer absorber to the front body region side by 165 mm or more and 215 mm or less.
The region corresponding to the urethral meatus exists in a range of 100 mm or more and 160 mm or less from the tip of the groove on the front body region side.
The groove in the area corresponding to the urethral meatus has a width of 15 mm or more and 40 mm or less.
The groove does not extend on the front body region side of the urethral meatus corresponding region.
The groove extends on the back body region side of the urethral meatus corresponding region.
The groove has a width of 15 mm or more and 40 mm or less.
The position of the rear end portion of the groove is a position of 87.5 mm or more from the central portion of the narrow region to the rear body region side.
The lower absorber contains pulp and
The lower layer absorber has a density of 0.06 g / cm ³ or less.
A region of 62.5 mm or more and 72.5 mm or less from the center of the absorbent article in the width direction and 168 mm or more and 188 mm or less from the central portion of the narrow region to the back body region side is a predetermined region where a load is relatively easy to be applied. Yes,
The SAP layer is arranged so as to include the predetermined region.
The amount of SAP in the SAP layer in the predetermined region is 4.2 g or more.
The basis weight of SAP in the upper layer absorber is 250 g / m ² or more and 300 g / m ² or less.
Absorbent article. The lower layer absorber contains a highly absorbent polymer and contains
In the predetermined region, the total amount of SAP contained in the upper layer absorber, the SAP layer and the lower layer absorber is 14 g or more.
The absorbent article according to claim 1. The width of the groove in the posterior body region is 10 mm or more and 50 mm or less than the region corresponding to the urethral meatus.
The absorbent article according to claim 1 or 2. The width of the absorber in the region including the predetermined region is wider than the width of the region not including the predetermined region.
The absorbent article according to any one of claims 1 to 3.

Images