CN109195559B - Urine absorption pad - Google Patents

Urine absorption pad Download PDF

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Publication number
CN109195559B
CN109195559B CN201680086169.0A CN201680086169A CN109195559B CN 109195559 B CN109195559 B CN 109195559B CN 201680086169 A CN201680086169 A CN 201680086169A CN 109195559 B CN109195559 B CN 109195559B
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CN
China
Prior art keywords
urine
absorbent
absorbent body
upper layer
groove portion
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Active
Application number
CN201680086169.0A
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Chinese (zh)
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CN109195559A (en
Inventor
村井隆将
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Unicharm Corp
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Unicharm Corp
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Publication of CN109195559A publication Critical patent/CN109195559A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/51—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the outer layers
    • A61F13/511—Topsheet, i.e. the permeable cover or layer facing the skin
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/534—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad
    • A61F13/535—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having an inhomogeneous composition through the thickness of the pad inhomogeneous in the plane of the pad, e.g. core absorbent layers being of different sizes

Abstract

A urine absorption pad capable of absorbing urine while preventing the absorbent body from being out of shape and approaching the capacity allowed by the absorbent body. The urine absorption pad is provided with a front sheet (120), a back sheet (130), and an absorber (140). The absorber includes an upper absorber (140a) positioned on the skin side and a lower absorber (140b) positioned on the non-skin side. The upper layer absorber has an upper layer groove part (141a) extending in the longitudinal direction in the urination region and extending from the surface on the topsheet side toward the inside of the upper layer absorber in the thickness direction. The lower layer absorber includes an absorbent core (144) and a cover sheet (145) covering the absorbent core. The absorbent core is wrapped with the cover sheet so that the non-skin side surface and both width-direction side surfaces of the absorbent core are covered and the skin-side surface of the absorbent core is covered with the cover sheet in a state where both width-direction end edges of the cover sheet overlap each other on the skin side of the absorbent core. The skin-side surface of the absorbent core is not joined to the cover sheet.

Description

Urine absorption pad
Technical Field
The present invention relates to a urine absorption pad.
Background
A urine absorption pad is a urine absorption pad used by being disposed in a diaper, and is used for, for example, a bedridden patient, a disabled person, or the like. Therefore, if the urine collection bag is installed for a certain period of time, it is required to be able to absorb a large amount of urine. On the other hand, there is a possibility that the absorbent body will lose its shape as a result of absorbing a large amount of urine, and a technique for absorbing a large amount of urine without causing the absorbent body to lose its shape has been studied.
As a technique for improving the absorption performance of an absorbent body, for example, patent document 1 discloses a disposable diaper. In the disposable diaper of patent document 1, the hydrophilic sheet including the absorbent body and the top sheet and/or the hydrophilic sheet and the absorbent body are fixed by adhesive, and the amount of adhesive in the longitudinal central region extending in the longitudinal direction and located at the center in the width direction is smaller than the amount of adhesive in the longitudinal side edge regions extending in the longitudinal direction and located at both sides in the width direction. That is, by reducing the amount of adhesive applied to the central region in the longitudinal direction, urine is prevented from being hindered by the adhesive when it is directed toward the absorbent body, and the absorbent body is prevented from being deformed by applying the adhesive without impairing the absorption performance. Further, patent document 2 discloses a technique of: in the absorbent article, even in a wet state, the shape of the convex portion formed on the top sheet for improving liquid permeability and skin touch can be maintained.
Prior art documents
Patent document
Patent document 1: japanese patent laid-open No. 2001-17470
Patent document 2: japanese patent No. 5683742
Disclosure of Invention
Problems to be solved by the invention
In the disposable diaper of patent document 1, the joining of the top sheet and the back sheet at the peripheral edge portion and the joining of the back sheet and the hydrophilic sheet are not explicitly shown in the specification and the drawings, but in consideration of the technical common knowledge, it is considered that both of them are fixed by adhesive bonding. In this case, the skin-side portion and the non-skin-side portion of the hydrophilic sheet are fixed to other members with an adhesive, and the volume of the region surrounded by the hydrophilic sheet cannot be increased. In this way, even if the absorbent body swells due to urine absorption, the absorbent body is hindered by the hydrophilic sheet and swells only up to the volume of the region surrounded by the hydrophilic sheet, and therefore the amount of urine absorption by the absorbent body is limited. As a result, the absorbent body cannot be used at the capacity limit, that is, urine cannot be absorbed close to the capacity allowed by the absorbent body, and there is a possibility that the absorption performance of the absorbent body cannot be sufficiently obtained. In this way, the amount of urine that can be absorbed by a single disposable diaper is reduced, and for example, for bedridden patients, disabled persons, or the like, the number of times of changing the disposable diaper at night increases, and the burden involved in excretion increases for these persons or their caregivers.
The invention aims to provide a urine absorption pad which can prevent the phenomenon that an absorber is out of shape and can absorb urine close to the allowable capacity of the absorber.
Means for solving the problems
The urine absorbent pad of the present invention is (1) a urine absorbent pad comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body located between the top sheet and the back sheet, and having a longitudinal direction, a width direction, and a thickness direction, wherein the absorbent body comprises an upper absorbent body located on a skin side and a lower absorbent body located on a non-skin side, the upper absorbent body has an upper groove portion extending in the longitudinal direction in a urination region and extending from a surface on the top sheet side toward an inside of the upper absorbent body in the thickness direction, the lower absorbent body comprises an absorbent core and an absorbent sheet covering the absorbent core, and the absorbent pad covers a surface on the non-skin side of the absorbent core and both side surfaces in the width direction, and covers a surface on the skin side of the absorbent core in a state where both end edges in the width direction of the sheet overlap each other on the skin side of the absorbent core The absorbent core is wrapped with the cover sheet, and the skin side surface of the absorbent core is not joined to the cover sheet.
In the urine absorbent pad of the present invention, the upper layer absorbent body is formed with the upper layer groove portion recessed from the topsheet side surface toward the lower layer absorbent body, and the skin side surface of the absorbent core of the lower layer absorbent body is not joined to the cover sheet, that is, both end edges in the width direction of the cover sheet move outward in response to swelling of the absorbent core, so that the capacity of the region inside the cover sheet can be increased. This makes it possible to move and absorb most of the excreted urine into the lower absorbent body through the upper groove portion in the urination region, and to suppress the inhibition of the cover sheet against the swelling of the absorbent core even when the absorbent core of the lower absorbent body swells due to an increase in the amount of urine absorbed by the lower absorbent body. As a result, the lower absorbent layer is not restricted by the amount of urine absorbed, and the absorbent body can be used up to its capacity limit. At this time, the absorbent core of the lower absorbent layer swells, and a part of the skin-side surface of the absorbent core is not covered with the covering sheet, so that the absorbent core may lose its shape. However, since the upper layer absorber is positioned on the skin side of the absorbent core, the upper layer absorber covers the skin side surface of the absorbent core that is not covered with the covering sheet, thereby preventing the absorber from becoming loose. Thus, the absorbent body can be used close to the capacity limit of the absorbent body while preventing the absorbent body from being deformed. That is, the absorbent pad can sufficiently obtain the absorption performance, and the burden on the wearer or the caregiver who cares the wearer can be reduced.
The urine absorbent pad of the present invention may be such that, in addition to the urine absorbent pad described in the above (1), (2) the non-skin side surface of the upper absorbent layer and the skin side surface of the cover sheet are not joined.
In the present urine absorbent pad, the cover sheet of the lower absorbent layer is not joined to the upper absorbent layer, and therefore the cover sheet is not further restricted by the movement of the upper absorbent layer. Thus, when the absorbent core of the lower layer absorbent body swells, the overlapped both end edges of the covering sheet can be more easily moved outward in the width direction without being obstructed by the upper layer absorbent body. This prevents the absorbent body from becoming loose and allows the absorbent body to be used close to the capacity limit of the absorbent body.
The urine absorbent pad of the present invention may be the urine absorbent pad described in the above (1) or (2), (3) the upper absorbent body may be wider than the lower absorbent body in the width direction, and a portion wider than the lower absorbent body may be joined to the back sheet.
In the urine absorbent pad, the upper absorbent layer is wider in the width direction than the lower absorbent layer, and the wide portion is joined to the back sheet. At this time, when the lower absorbent body absorbs urine in the width direction and swells, and both end edges thereof reach the joining portion where the wide portion and the back sheet are joined, the substantially central portion of the lower absorbent body is convex toward the skin side, which is the side of the upper absorbent body, and the deformation of the lower absorbent body in the width direction is absorbed. With this deformation, the absorbent body comes closer to the urination region of the wearer, and most of the excreted urine can be easily absorbed by moving from the upper groove portion of the urination region into the lower absorbent body. This prevents the absorbent body from becoming loose, and enables the absorbent body to be used closer to the capacity limit of the absorbent body.
The urine absorbent pad of the present invention may be the urine absorbent pad described in any one of (1) to (3), (4) wherein the weight per unit area of the adhesive between the front sheet and the back sheet at both ends of the urine absorbent pad in the longitudinal direction is larger than the weight per unit area of the adhesive between the front sheet and the back sheet at the other ends of the urine absorbent pad.
As the absorbent core swells and expands with the absorption of urine, the swelling force of the absorbent core becomes too strong, gaps occur at both ends in the longitudinal direction, and the absorbent core may be deformed from both ends in the longitudinal direction. In the present urine absorbent pad, since a large amount of adhesive is applied to both ends in the longitudinal direction of the urine absorbent pad, such a situation that the absorbent body is deformed from both ends in the longitudinal direction can be prevented. This prevents the absorbent body from becoming loose and allows the absorbent body to be used close to the capacity limit of the absorbent body.
The urine absorption pad of the present invention may be the urine absorption pad described in any one of (1) to (4), (5) the upper layer groove portion of the upper layer absorbent body may penetrate in the thickness direction, the absorbent core of the lower layer absorbent body may have a lower layer groove portion extending in the longitudinal direction and recessed in the thickness direction in the urination region, and at least a part of the lower layer groove portion and the upper layer groove portion may overlap in the thickness direction.
In the urine absorption pad of the present invention, the lower layer groove portion is formed also in the lower layer absorbent body, so that urine can be further guided to the inside of the lower layer absorbent body on the non-skin side, and the absorbent body can be used closer to the capacity limit of the absorbent body. Further, the wet state of urine spreading on the top sheet can be suppressed, and even if the absorbent body is used near the capacity limit of the absorbent body, the wet state of the skin of the wearer can be suppressed, and the dry state of the skin can be maintained.
The urine absorbent pad of the present invention may be the urine absorbent pad described in the above (5), (6) the lower groove portion of the absorbent core may penetrate in the thickness direction, and the absorbent core may be joined to the cover sheet in a region surrounding the non-skin-side end edge of the lower groove portion.
In the urine absorbent pad of the present invention, the region of the absorbent core surrounding the non-skin-side end edge of the lower groove portion is joined to the cover sheet, and therefore, the position of the non-skin-side end edge of the lower groove portion is fixed. This allows the shape of the lower groove portion to be maintained regardless of the movement of the wearer or the flow of urine. This makes it possible to use the absorbent body closer to the capacity limit of the absorbent body while maintaining the ability to guide urine to the lower absorbent body.
In the urine absorption pad of the present invention as set forth in the above (5) or (6), (7) one of the longitudinal directions is a ventral direction and the other is a dorsal direction, a distance between a lower ventral end of the lower groove in the ventral direction and an end of the urine absorption pad in the ventral direction is shorter than a distance between a lower dorsal end of the lower groove in the dorsal direction and an end of the urine absorption pad in the dorsal direction, and an angle formed by a wall surface of the lower ventral end with respect to a bottom surface in the lower groove is closer to a perpendicular angle than an angle formed by a wall surface of the lower dorsal end with respect to the bottom surface in the lower groove.
Since the wall surface of the lower abdomen-side end portion is closer to the end portion of the urine absorption pad than the wall surface of the lower back-side end portion, urine leaking from the lower abdomen-side end portion relatively easily reaches the end portion of the urine absorption pad via the upper groove portion. The urine absorption pad is formed so that the wall surface of the lower abdomen-side end is formed more steeply than the wall surface of the lower back-side end so as to be perpendicular to the bottom surface in the lower groove. Therefore, urine can be made less likely to leak from the lower abdomen-side end portion toward the end portion of the urine absorption pad via the upper groove portion. The urine can be further guided to the inside of the lower absorbent body. This makes it possible to use the absorbent body closer to the capacity limit of the absorbent body without causing urine leakage.
In the urine absorption pad of the present invention, in addition to the urine absorption pad described in any one of (5) to (7), (8) an angle formed by the wall surface of the lower groove portion with respect to the bottom surface in the lower groove portion may be closer to a vertical angle than an angle formed by the wall surface of the upper groove portion with respect to the bottom surface in the upper groove portion.
The urine absorption pad is formed so that the wall surface of the lower groove portion is formed more steeply than the wall surface of the upper groove portion so as to be perpendicular to the bottom surface in the groove portion. Therefore, the wall surface of the upper groove portion is relaxed, so that urine can be more easily guided to the lower groove portion via the upper groove portion, and the temporarily guided urine can be made less likely to leak to the outside because the wall surface of the lower groove portion is steep. This makes it possible to use the absorbent body closer to the capacity limit of the absorbent body without causing urine leakage.
In the urine absorption pad of the present invention, in the urine absorption pad described in any one of (1) to (8), (9) one of the longitudinal directions is a ventral direction and the other is a dorsal direction, a distance between an upper ventral end of the upper groove in the ventral direction and an end of the urine absorption pad in the ventral direction is shorter than a distance between an upper dorsal end of the upper groove in the dorsal direction and an end of the urine absorption pad in the dorsal direction, and an angle formed by a wall surface of the upper ventral end with respect to a bottom surface in the upper groove is closer to a perpendicular angle than an angle formed by a wall surface of the upper dorsal end with respect to the bottom surface in the upper groove.
Since the wall surface of the front end of the upper layer is closer to the end of the urine absorption pad than the wall surface of the rear end of the upper layer, urine leaking from the front end of the upper layer easily reaches the end of the urine absorption pad. The urine absorption pad can be formed to be steeper than the wall surface of the upper back end, so that the wall surface of the upper front end is perpendicular to the bottom surface in the upper groove. Therefore, it is possible to make it difficult for urine to leak from the upper abdomen-side end portion toward the end portion of the urine absorption pad, and to guide the urine further into the lower absorbent layer. As a result, no urine leakage occurs, and the absorbent body can be used closer to the capacity limit of the absorbent body.
The urine absorption pad of the present invention may be such that (10) in the urine absorption pad according to any one of the above (1) to (9), one of the longitudinal directions is a ventral direction, and the other is a dorsal direction, a distance between an end in the width direction of the upper layer groove and one end in the width direction of the urine absorption pad, and a distance between an end in the width direction of the upper layer groove and the other end in the width direction of the urine absorption pad are shorter than a distance between an end in the ventral direction of the upper layer ventral side of the upper layer groove and an end in the ventral direction of the urine absorption pad, and a distance between an end in the dorsal direction of the upper layer back side of the upper layer groove and an end in the dorsal direction of the upper layer groove, and an angle formed by wall surfaces of the ends in the width direction of the one and the other upper layers with respect to a bottom surface in the upper layer groove, the angle formed by the wall surface of the upper ventral end with respect to the bottom surface in the upper groove and the angle formed by the wall surface of the upper dorsal end with respect to the bottom surface in the upper groove are closer to a perpendicular angle.
Since the wall surface of the upper layer width direction end portion is closer to the end portion of the urine absorption pad than the wall surface of the upper layer abdomen side end portion and the wall surface of the upper layer back side end portion, urine leaking from the upper layer width direction end portion relatively easily reaches the end portion of the urine absorption pad. In the urine absorption pad, the wall surface of the upper layer width direction end is formed more steeply and perpendicularly to the bottom surface in the upper layer groove portion than the wall surface of the upper layer abdomen side end and the wall surface of the upper layer back side end. Therefore, urine can be made less likely to leak from the upper layer width direction end portion toward the end portion of the urine absorption pad, and the urine can be further guided to the inside of the lower layer absorbent body. This makes it possible to use the absorbent body closer to the capacity limit of the absorbent body without causing urine leakage.
The urine absorption pad of the present invention may be the urine absorption pad described in any one of (1) to (10), (11) wherein the upper layer absorbent body and the lower layer absorbent body include a polymer absorbent body and pulp fibers, and a ratio of a weight per unit area of the polymer absorbent body to a weight per unit area of the polymer absorbent body and the pulp fibers in total is larger in the upper layer absorbent body than in the lower layer absorbent body.
In the urine absorption pad of the present invention, the ratio of pulp fibers is higher in the lower layer absorbent body than in the upper layer absorbent body, and therefore urine can be further guided into the lower layer absorbent body. This enables the absorber to be used closer to the capacity limit of the absorber.
The urine absorption pad of the present invention may be the urine absorption pad described in any one of (1) to (11), (12) the top sheet is a nonwoven fabric having a convex portion formed on the surface on the skin side, the nonwoven fabric may have a content of the thickness direction oriented fiber of the convex portion larger than a content of the thickness direction oriented fiber of the nonwoven fabric in a portion other than the convex portion, and the nonwoven fabric may have a thickness when wet of 85% or more of a thickness when dry of the nonwoven fabric.
In the urine absorbent pad of the present invention, the top sheet is a nonwoven fabric having predetermined characteristics and having projections formed on the skin-side surface, so that the shape of the projections in the top sheet can be maintained, clogging of the top sheet can be suppressed, and the absorbent body can be used closer to the capacity limit of the absorbent body.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, a urine absorption pad capable of absorbing urine while preventing the absorbent body from becoming misshapen and approaching the capacity allowed by the absorbent body can be provided.
Drawings
Fig. 1 is a plan view of a urine absorption pad according to the embodiment.
Fig. 2 is an exploded perspective view of a main portion of the urine absorption pad shown in fig. 1.
Fig. 3 is a sectional view III-III of fig. 1.
Fig. 4 is a sectional view IV-IV of fig. 1.
Fig. 5 is a schematic view for explaining the operation of the absorbent body of the urine absorption pad shown in fig. 1.
FIG. 6 is a schematic view illustrating the longitudinal shape of the groove portion of the urine absorption pad shown in FIG. 1.
FIG. 7 is a schematic view for explaining the shape in the width direction of the groove portion of the urine absorption pad shown in FIG. 1.
Figure 8 is a partial perspective view of the topsheet of the urine absorbent pad shown in figure 1.
Fig. 9 is a schematic diagram illustrating a method of manufacturing the surface sheet of fig. 8.
Detailed Description
Hereinafter, a urine absorption pad according to an embodiment will be described with reference to the drawings.
Fig. 1 to 4 show the structure of a urine absorption pad 100 according to the present embodiment. Wherein fig. 1 is a plan view of the urine absorption pad 100, fig. 2 is an exploded perspective view of a main portion of the urine absorption pad 100, fig. 3 is a sectional view taken along line III-III of fig. 1, and fig. 4 is a sectional view taken along line IV-IV of fig. 1. The urine absorption pad 100 has a longitudinal direction L, a width direction W, and a thickness direction T, and further has a central axis CL extending in the longitudinal direction L through the center of the width direction W, and a central axis CW extending in the width direction W through the center of an inter-crotch portion (described later) in the longitudinal direction L. The directions of approach and separation from the central axis CL are the directions inside and outside the width direction W, respectively, and the directions of approach and separation from the central axis CW are the directions inside and outside the longitudinal direction L. In fig. 1, the upward facing side is the front side or ventral side in the longitudinal direction L, and the downward facing side is the rear side or dorsal side in the longitudinal direction L. In the present specification, the case where the urine absorption pad 100 is viewed from the upper surface side in the thickness direction is simply referred to as "plan view". The "skin side" and the "non-skin side" refer to a side relatively close to the skin surface of the wearer and a side relatively distant from the skin surface of the wearer in the thickness direction T when the diaper 100 is worn by the wearer of the diaper 100.
As shown in fig. 1 and 2, the urine absorption pad 100 has a belly portion 111, a crotch portion 112, and a back portion 113 which are arranged in the longitudinal direction, and has a gourd shape in which the substantially center of the crotch portion 112 in the longitudinal direction is contracted in plan view. When the urine absorption pad 100 is worn, the abdomen-side portion 111 touches the abdomen of the wearer, the crotch portion 112 touches the crotch of the wearer, and the back-side portion 113 touches the buttocks and/or the back of the wearer. The urine absorption pad 100 has, for example, a dimension in the longitudinal direction L of 350 to 880mm and a dimension in the width direction W of 160 to 460 mm.
The urine absorption pad 100 includes a top sheet 120, a back sheet 130, and an absorbent body 140. Here, since the longitudinal direction L, the width direction W, and the thickness direction T, and the skin side and the non-skin side of the urine absorption pad 100 correspond to the front sheet 120, the back sheet 130, and the absorbent body 140, the longitudinal direction L, the width direction W, and the thickness direction T, and the skin side and the non-skin side are used in the same manner as the urine absorption pad 100 for the front sheet 120, the back sheet 130, and the absorbent body 140.
The top sheet 120 is a liquid-permeable sheet positioned on the skin side in the thickness direction T. Examples of the top sheet 120 include any liquid-permeable sheets such as a liquid-permeable nonwoven fabric, a woven fabric, a synthetic resin film having liquid-permeable holes formed therein, and a composite sheet thereof. The back sheet 130 is a liquid impermeable sheet located on the non-skin side in the thickness direction T. Examples of the back sheet 130 include any liquid-impermeable sheet such as a liquid-impermeable nonwoven fabric, a synthetic resin film, a composite sheet of a nonwoven fabric and a synthetic resin film, and an SMS nonwoven fabric. The absorbent body 140 is a member having liquid-absorbing properties and liquid-retaining properties and located between the front sheet 120 and the back sheet 130. The absorber 140 includes an upper layer absorber 140a positioned on the skin side and a lower layer absorber 140b positioned on the non-skin side and including an absorbent core 144 and a cover sheet 145 covering the absorbent core 144. Examples of the material of the upper layer absorbent 140a and the absorbent core 144 include pulp fibers, synthetic fibers, and polymeric absorbents. The cover sheet 145 may be, for example, a nonwoven fabric or a tissue. Here, the number of layers included in the absorber 140 is arbitrary, and in the present embodiment, the absorber 140 further includes an upper sheet 140c positioned on the skin side of the upper layer absorber 140 a. Examples of the top sheet 140c include nonwoven fabric and tissue.
In the present embodiment, the urine absorption pad 100 further includes a pair of leakage preventing walls 160 and an outer sheet 170. The pair of leakage preventing walls 160 and 160 are liquid-impermeable sheets (not shown in fig. 2) that are positioned on both sides of the top sheet 120 in the width direction W and extend in the longitudinal direction L. The outer edge of the leakage preventing wall 160 in the width direction W is a fixed end fixed to the front sheet 120, and the inner edge is a free end. An elastic member (not shown) extending in the longitudinal direction L is provided at the free end of the leakage preventing wall 160, and the pair of leakage preventing walls 160 and 160 stand up toward the skin side when worn. The outer sheet 170 is a liquid-impermeable sheet (not shown in fig. 1 and 2) positioned on the non-skin side of the back sheet 130. The material of the leakage preventing wall 160 and the exterior sheet 170 is not particularly limited, and examples thereof include the material of the back sheet 130.
The skin-side surface of the absorber 140, i.e., the skin-side surface of the upper sheet 140c and the front sheet 120 are bonded to each other with an adhesive (not shown) having a predetermined pattern, and the non-skin-side surface of the absorber 140, i.e., the non-skin-side surface of the lower absorber 140b and the back sheet 130 are bonded to each other with an adhesive (not shown) having a predetermined pattern. The front sheet 120 and the back sheet 130 are bonded to each other at their peripheral edge portions with an adhesive (not shown) having a predetermined pattern. The pair of leakage preventing walls 160 and the front sheet 120 are bonded to each other with an adhesive (not shown) having a predetermined pattern, and the exterior sheet 170 and the back sheet 130 are bonded to each other with an adhesive (not shown) having a predetermined pattern. The outer sheet 170 and the pair of leakage preventing walls 160 and 160 are joined to each other at their peripheral edge portions with an adhesive (not shown) having a predetermined pattern. Weight per unit area (g/m) of adhesive2) Appropriately adjusted in consideration of materials, properties, and the like. The weight per unit area is, for example, 0.5 to 50g/m2Preferably 1 to 20g/m2. The weight per unit area of the adhesive is calculated by dividing the amount (mass) of the adhesive applied to a predetermined area of the material (the front sheet 120, the back sheet 130, the absorbent body 140, and the like) of the urine absorbent pad 100 by the predetermined area.
The thickness, basis weight, and the like of the upper layer absorbent 140a and the lower layer absorbent 140b are appropriately adjusted in consideration of the liquid absorption properties of the absorbent 140. The upper layer absorber 140a has a thickness of usually 1.5 to 5.0mm, preferably 2.5 to 3.5mm, and a weight per unit area of usually 150 to 400g/m2Preferably 200 to 300g/m2. The lower layer absorber 140b has a thickness of usually 1.5 to 5.0mm, preferably 2.5 to 3.5mm, and a weight per unit area of usually 150 to 400g/m2Preferably 200 to 300g/m2. Measurement of thickness of absorbent body Using urine absorption100mm X100 mm absorber samples cut out from the pads, and a commercially available thickness measuring instrument (for example, JA257 manufactured by PEACOCK Co., Ltd., measuring surface 50mm (diameter), measuring pressure 3g/cm2) The procedure was as follows. Using a thickness measuring device, applying a fixed pressure of 3g/cm to 5 different parts of the absorbent body sample2The thickness of each part after 10 seconds of pressurization was measured by pressurization, and the average of 5 measured values was defined as the thickness (mm). The basis weight of the absorbent body is measured, for example, as follows. The mass of 3 test pieces (10 mm. times.10 mm) cut out from the absorber was measured with a direct-indicating balance (e.g., an electronic balance HF-300 manufactured by Seiko Kogyo Co., Ltd.), and the mass per unit area (g/m) of the absorber calculated from the average of the masses of the 3 test pieces was calculated2) The basis weight of the absorbent body is set.
The upper layer absorbent 140a and the lower layer absorbent 140b preferably include a polymer absorbent and pulp fibers from the viewpoint of absorption performance. In this case, the ratio of the weight per unit area of the polymer absorbent to the weight per unit area of the total of the polymer absorbent and pulp fibers (the weight per unit area of the absorbent in the present embodiment), that is, the content of the polymer absorbent, is preferably larger in the upper layer absorbent 140a than in the lower layer absorbent 140 b. In other words, the ratio of the basis weight of the pulp fibers to the basis weight of the total of the polymeric absorbent material and the pulp fibers, that is, the content of the pulp fibers, is preferably larger in the lower absorbent material 140b than in the upper absorbent material 140 a. In the urine absorption pad 100, the proportion of pulp fibers is higher in the lower layer absorbent body 140b than in the upper layer absorbent body 140a, and therefore urine can be further guided into the lower layer absorbent body 140 b. This enables the absorber 140 to be used closer to the capacity limit of the absorber 140. The basis weight of the polymer absorbent is calculated by dividing the amount (mass) of the polymer absorbent, which is mixed with the absorbent having a predetermined area, by the predetermined area. The basis weight of the pulp fiber was calculated by subtracting the basis weight of the polymeric absorbent from the basis weight of the absorbent.
The upper absorbent body 140a has a substantially gourd-shaped shape that is long in the longitudinal direction L and is contracted substantially at the center of the crotch portion 112 in the longitudinal direction L in plan view. The lower absorbent body 140b has a substantially rectangular shape that is long in the longitudinal direction L and short in the width direction W in plan view. Here, the lower layer absorbent body 140b has a dimension in the longitudinal direction L shorter than the dimension in the longitudinal direction L of the upper layer absorbent body 140a, and has a dimension in the width direction W shorter than the dimension in the width direction W of the upper layer absorbent body 140 a. Therefore, both end edges in the longitudinal direction L of the upper layer absorbent body 140a are positioned outside in the longitudinal direction L than both end edges in the longitudinal direction L of the lower layer absorbent body 140b, and the upper layer absorbent body 140a is formed longer on both sides in the longitudinal direction L than the lower layer absorbent body 140 b. In addition, both end edges in the width direction W of the upper layer absorbent body 140a are positioned outside in the longitudinal direction L than both end edges in the width direction W of the lower layer absorbent body 140b, and the upper layer absorbent body 140a is formed to be wider on both sides in the width direction W than the lower layer absorbent body 140 b. The upper layer piece 140c has a substantially rectangular shape in plan view, which is long in the longitudinal direction L and short in the width direction W. The dimension in the longitudinal direction L of the upper sheet 140c is the same as the dimension in the longitudinal direction L of the upper absorbent body 140a, and the dimension in the width direction W is longer than the dimension of the crotch portion 112 in the width direction W of the upper absorbent body 140a, shorter than the dimensions of the stomach portion 111 and the back portion 113, and has a substantially rectangular shape. Here, the shape of each configuration of the absorber 140 in a plan view is arbitrary.
As shown in fig. 3 and 4, in the lower layer absorbent body 140b, the absorbent core 144 has a non-skin side surface 144sc, a skin side surface 144sa, and two side surfaces 144sb, 144sb in the width direction W between the non-skin side surface 144sc and the skin side surface 144 sa. In addition, the cover sheet 145 (core wrap) has: a non-skin side portion 145sc that faces the non-skin side surface 144sc when the absorbent core 144 is wrapped; two side portions 145sb, 145sb facing the two side surfaces 144sb, 144 sb; and two skin-side portions 145sa1 and 145sa2 which are portions facing the skin-side surface 144sa and include both end portions 145e1 and 145e2 in the width direction W. The cover sheet 145 covers the non-skin side surface 144sc of the absorbent core 144 with the non-skin side portion 145sc, covers the both side surfaces 144sb and 144sb of the absorbent core 144 in the width direction W with the both side portions 145sb and 145sb, and covers the skin side surface 144sa of the absorbent core 144 with the both skin side portions 145sa1 and 145sa2 superposed, thereby enclosing the absorbent core 144.
In the absorbent body 140, the non-skin side surface of the upper layer sheet 140c and the skin side surface of the upper layer absorbent body 140a are bonded to each other with an adhesive (not shown) having a predetermined pattern. The non-skin-side portion 145sc of the cover sheet 145 and the non-skin-side surface 144sc of the absorbent core 144 are bonded to each other with an adhesive (not shown) having a predetermined pattern. Weight per unit area (g/m) of adhesive2) The material, properties, and the like of the urine absorption pad 100 may be appropriately adjusted in consideration. The weight per unit area is usually 0.5 to 50g/m2Preferably 1 to 20g/m2。
On the other hand, the skin-side surface 144sa of the absorbent core 144 is not joined to the covering sheet 145. That is, the skin-side surface 144sa (preferably, the both side surfaces 144sb, 144sb) of the absorbent core 144 is not joined to the skin-side portions 145sa1, 145sa2 (preferably, the both side portions 145sb, 145sb) of the cover sheet 145 and is not joined by an adhesive or the like, and the skin-side portions 145sa1, 145sa2 of the cover sheet 145 are not joined to each other at the both end portions 145e1, 145e2 and are not joined by an adhesive or the like.
The operation when the skin-side surface 144sa of the absorbent core 144 is not joined to the cover sheet 145 will be described. Fig. 5 is a diagram schematically illustrating the action of the absorber 140. As shown in fig. 5 (a), before use of the urine absorption pad 100, the absorbent core 144 has, for example, a dimension W1 in the width direction W and a dimension T1 in the thickness direction T. Thereafter, as the urine absorbent pad 100 is used, the amount of urine absorbed into the absorbent core 144 increases, and the absorbent core 144 swells, thereby increasing the dimension in the width direction W and the thickness direction T. If the skin-side portions 145sa1, 145sa2 of the cover sheet 145 positioned on the skin-side surface 144sa of the absorbent core 144 are bound to the absorbent core 144 with an adhesive or the like, an upper limit is imposed on the capacity of the region inside the cover sheet 145. At this time, if the absorbent core 144 becomes larger than its capacity, the absorption of urine is restricted.
However, in the present embodiment, the skin-side portions 145sa1, 145sa2 and both side portions 145sb, 145sb of the cover sheet 145 positioned on the skin-side surface 144sa of the absorbent core 144 are not bound to the absorbent core 144 with an adhesive or the like. Therefore, the skin-side portion 145sa1, 145sa2 and the side portions 145sb, 145sb of the cover sheet 145 can be easily moved and deformed in the width direction W and the thickness direction T, and the volume of the region inside the cover sheet 145 can be increased. Therefore, even if the amount of urine absorbed in the lower absorbent body 140b increases, the absorbent core 144 of the lower absorbent body 140b swells and expands in the width direction W and the thickness direction T, and accordingly, the skin-side portions 145sa1, 145sa2 and the side portions 145sb, 145sb of the cover sheet 145 can move and deform in the width direction W and the thickness direction T. That is, the cover sheet 145 can prevent the absorbent core 144 from swelling. As a result, the lower layer absorbent body 140b is not limited by the amount of urine absorbed, and the absorbent body 140 can be used close to the capacity limit of the absorbent body 140. For example, as shown in fig. 5 (b), the absorbent core 144 may be configured such that the dimension in the width direction W is W2 which is sufficiently larger than W1, and the dimension in the thickness direction T is T2 which is sufficiently larger than T1.
At this time, as the amount of urine absorbed increases, the absorbent core 144 of the lower absorbent layer 140b begins to swell, and as shown in fig. 5 (b), a portion of the skin-side surface 144sa of the absorbent core 144 is always uncovered by the covering sheet 145. Thus, at first glance, the absorbent core 144 that is not covered with the covering sheet 145 may be considered to be deformed. However, in the present embodiment, since the upper layer absorbent body 140a is positioned on the skin side of the absorbent core 144, the skin side surface 144sa of the absorbent core 144 not covered with the covering sheet 145 is covered with the upper layer absorbent body 140a, and thus the absorbent body 140 can be prevented from being out of shape. In this case, the covering sheet 145 and the upper layer absorbent body 140a may be joined to such an extent that the movement of the covering sheet 145 is not so much hindered.
In the present embodiment, the cover sheet 145 is not joined to the upper layer absorbent body 140 a. That is, the skin-side portions 145sa, 145sa of the cover sheet 145 are not bonded to the non-skin-side surface of the upper layer absorbent body 140a, and are not bonded with an adhesive or the like. Therefore, the covering sheet 145 is not substantially restricted in its movement and deformation by the upper layer absorbent body 140 a. Thus, even if the absorbent core 144 of the lower absorbent body 140b swells and expands outward in the width direction W, the skin-side portions 145sa, 145sa of the covering sheet 145 can more easily move outward in the width direction W without being obstructed by the upper absorbent body 140a, and the volume of the area inside the covering sheet 145 can be made larger. That is, the covering sheet 145 can more reliably suppress the state in which the absorbent core 144 is prevented from swelling.
In the present embodiment, as described above, the upper layer absorbent body 140a is formed wider on both sides in the width direction W than the lower layer absorbent body 140 b. At this time, the portion of the upper layer absorbent body 140a that is wider in the width direction W than the lower layer absorbent body 140b is joined to the back sheet 130 on the non-skin side with an adhesive. In this case, the lower layer absorbent 140b absorbs urine and swells in the width direction W, and when both end edges thereof reach the joint portion where the wide portion is joined to the back sheet 130, the lower layer absorbent does not swell in the width direction W. Therefore, the substantially central portion of the lower absorbent body 140b bulges toward the skin side, which is the side of the upper absorbent body 140a, and the deformation of the lower absorbent body 140b in the width direction W is absorbed. The deformation of the lower layer absorbent body 140b protruding toward the skin side forms a urination region where the absorbent body 140 comes closer to the excretory opening of the wearer, and most of the excreted urine can be easily absorbed by moving at least the upper layer groove portions 141a (described later) of the urination region into the lower layer absorbent body 140 b. In particular, in the present embodiment, it is preferable that the absorption rate is decreased as the absorption amount of urine in the absorbent body 140 increases (the swelling of the lower absorbent body 140b progresses), and the urination region is close to the absorbent body 140 to promote the absorption of urine. This can prevent the absorbent body 140 from being deformed, and can use the absorbent body 140 closer to the capacity limit of the absorbent body 140.
In the present embodiment, as described above, the upper layer absorbent body 140a is formed longer on both sides in the longitudinal direction L than the lower layer absorbent body 140 b. At this time, a portion of the upper layer absorbent body 140a longer than the lower layer absorbent body 140b in the longitudinal direction L is joined to the back sheet by an adhesive on the non-skin side. In this case, similarly to the case where the lower absorbent body 140b is formed wider on both sides in the width direction W than the upper absorbent body 140a, most of the excreted urine can be easily absorbed by moving from the upper groove portions 141a (described later) into the lower absorbent body 140b while assisting the deformation of the lower absorbent body 140b to protrude toward the skin side.
In the present embodiment, the weight per unit area of the adhesive between the front sheet 120 and the back sheet 130 at both ends E1 and E2 of the urine absorbent pad 100 shown in fig. 1 is larger than the weight per unit area of the adhesive between the front sheet 120 and the back sheet 130 except for both ends E1 and E2 of the urine absorbent pad 100 in the longitudinal direction L. Here, the both end portions E1 and E2 are regions inward from both end edges of the urine absorption pad 100 in the longitudinal direction L by a predetermined length, and are regions including parts of both ends of the absorbent body 140 inside the regions. For example, the distance from the ends of the urine absorption pad 100 is in the range of about 20% of the length of the urine absorption pad 100. When the absorbent core 144 swells and advances by absorbing urine, the swelling force of the absorbent body 140 becomes too strong, and a gap is formed in the thickness direction T at both end portions E1 and E2 in the longitudinal direction L, so that the absorbent core 144 is likely to lose its shape from the vicinity of both end portions E1 and E2 in the longitudinal direction L. However, in the urine absorption pad 100 of the present invention, since a large amount of adhesive is applied to both end portions E1 and E2 of the urine absorption pad 100, it is possible to prevent a situation in which a gap is formed between both end portions E1 and E2 and the absorbent body 140 is deformed from both end portions E1 and E2. This can prevent the absorbent body 140 from being deformed, and can use the absorbent body 140 close to the capacity limit of the absorbent body 140.
In the present embodiment, the weight per unit area of the adhesive between the front sheet 120 and the back sheet 130 in the absorbent body non-existing region where the absorbent body 140 is not present in the urine absorption pad 100 in a plan view may be larger than the weight per unit area of the adhesive between the front sheet 120 and the back sheet 130 in the absorbent body existing region where the absorbent body 140 is present in the urine absorption pad 100 in a plan view in the width direction W. It is considered that, when the absorbent core absorbs urine and swells, the swelling force of the absorbent body becomes too strong, gaps are generated also at both ends in the width direction W, and the absorbent core 144 is deformed from both ends in the width direction W. However, in the urine absorbent pad 100, when a large amount of adhesive is applied to both ends in the width direction W of the urine absorbent pad, such a situation that the absorbent body is deformed from both ends in the width direction W can be prevented. This can prevent the absorbent body 140 from being deformed, and can use the absorbent body 140 close to the capacity limit of the absorbent body 140.
As shown in fig. 2 and 3, the absorbent body 140 includes an upper layer groove portion 141a recessed in the thickness direction T from the skin side toward the non-skin side in the absorbent body 140. The upper groove portion 141a is a through-hole penetrating the upper absorbent body 140a in the thickness direction T in the present embodiment. The upper groove portion 141a is located in the crotch portion 112 of the urine absorbent pad 100, and extends in the longitudinal direction L through the center in the width direction W of the absorbent body 140. That is, the upper groove portion 141a is formed in the urination region. Thus, before the excreted urine spreads on the top sheet 120, that is, almost no contamination occurs on the skin-side surface of the urine absorption pad 100, the urine can be guided to the inside of the lower absorbent body 140b via the upper groove portions 141a, and the absorbent body 140 can be used close to the capacity limit of the absorbent body 140. In particular, in the present embodiment, since the upper groove portion 141a is a through hole, urine can be more quickly guided into the lower absorbent body 140 b.
In the present embodiment, the upper layer groove portion 141a is a through-hole, and the lower layer absorbent body 140b has a lower layer groove portion 141b recessed in the thickness direction T from the skin side toward the non-skin side. The lower groove portion 141b is a through hole penetrating the lower absorbent body 140b in the thickness direction T in the present embodiment. The lower groove portion 141b is positioned in the crotch portion 112 of the urine absorbent pad 100, and extends in the longitudinal direction L through the center in the width direction W of the absorbent body 140. That is, the lower groove portion 141b is formed in the urination region. Upper groove portion 141a and lower groove portion 141b are formed to overlap at least partially in a plan view. Thus, when the excreted urine reaches the lower absorbent body 140b via the upper groove portions 141a of the upper absorbent body 140a, the urine can be guided further inside the lower absorbent body 140b via the lower groove portions 141b, and the absorbent body 140 can be used close to the capacity limit of the absorbent body 140. In particular, in the present embodiment, since the lower groove portion 141b is a through hole, urine can be more quickly guided to the inside of the lower absorbent body 140 b.
In the present embodiment, the positions of the two through holes as the upper groove portion 141a and the lower groove portion 141b are formed to coincide with each other in a plan view (that is, the two through holes communicate with each other). As a result, in the absorbent body 140, the groove portions 141 in which the upper groove portions 141a and the lower groove portions 141b overlap in the thickness direction T are formed. Thus, when the excreted urine reaches the lower absorbent body 140b via the upper groove portions 141a of the upper absorbent body 140a, the urine can be more reliably introduced into the lower groove portions 141b, and can be guided further inside the lower absorbent body 140 b. By guiding the urine through the lower layer and absorbing the urine by the lower absorbent body 140b, the return of the liquid to the upper absorbent body 140a can be prevented, and the feeling of dryness, that is, the rewet can be reduced.
The dimensions (length) in the longitudinal direction L and the dimensions (width) in the width direction W of the upper groove portion 141a and the lower groove portion 141b in plan view can be appropriately adjusted in consideration of the dimensions and the like of the upper absorbent body 140a and the lower absorbent body 140 b. The width of the upper groove 141a is usually 5.0 to 50mm, preferably 10 to 20 mm. The width of the lower groove 141b is equal to or smaller than that of the upper groove 141a, and is usually 5.0 to 40mm, preferably 10 to 15 mm. The length of the upper groove 141a is usually 50 to 300mm, preferably 50 to 200mm, and more preferably 50 to 150 mm. The length of the lower groove 141b is equal to or shorter than that of the upper groove 141a, and is usually 30 to 250mm, preferably 30 to 150 mm. The width and length of the upper groove 141a are equal to or greater than those of the lower groove 141b, so that even if some misalignment occurs in the process of stacking the upper absorbent 140a and the lower absorbent 140b, the size of the groove 141 as viewed from the surface sheet 120 side of the absorbent 140 can be kept substantially constant. Further, since a step is formed on the inner wall surface of the groove portion 141, the inner surface area of the groove portion 141 increases, and therefore, the urine absorption capacity of the absorbent body 140 in the portion where the groove portion 141 is formed is improved.
In general, in order to prevent the absorbent body from twisting, a means of heat fusion or compression may be used after the absorbent body is covered with the covering sheet. However, when these means are performed, the volume of the absorbent body may be reduced, or unexpected deformation may occur when the absorbent body starts swelling upon absorption of urine, resulting in leakage of urine. Therefore, in the present embodiment, in order to prevent such a situation, it is preferable that these means are not substantially implemented.
Fig. 6 and 7 schematically show a cross-sectional view along the longitudinal direction L and perpendicular to the width direction W and a cross-sectional view along the width direction W and perpendicular to the longitudinal direction L, respectively, with respect to the groove portion 141 of the absorber 140 and its peripheral portion. In these figures, the upper sheet 140c is omitted, and the absorbent core 144 and the cover sheet 145 are integrally described as the lower absorbent body 140 b. Here, the upper groove 141a includes: wall surfaces SWU1, SWU2 arranged along the longitudinal direction L and facing the width direction W; and a front (ventral) wall FWU and a rear (dorsal) wall BWU disposed along the width direction W and facing the longitudinal direction L. In addition, the lower groove 141b includes: wall surfaces SWL1, SWL2 arranged along the longitudinal direction L and facing the width direction W; and a front (ventral) wall FWL and a rear (dorsal) wall BWU arranged along the width direction W and facing the longitudinal direction L. In fig. 6, the left side in the longitudinal direction L is the front side (ventral side) and the right side is the rear side (dorsal side). When the upper groove portion 141a is a through-hole, the bottom BU of the upper groove portion 141a is a plane virtually extending the non-skin side surface of the upper absorbent body 140a through-hole. Similarly, when the lower groove portion 141b is a through hole, the bottom BL of the lower groove portion 141b is a plane virtually extending the non-skin side surface of the lower absorbent body 140b through the through hole. Therefore, the bottom surfaces BU and BL are parallel to each other.
As is apparent from fig. 1 and 6, the distance between the lower abdominal end LL1, which is the end in the abdominal direction of the lower groove portion 141b, and the end in the abdominal direction of the urine absorption pad 100 is smaller than the distance between the lower back end LL2, which is the end in the back direction of the lower groove portion 141b, and the end in the back direction of the urine absorption pad 100. Therefore, in the present embodiment, as shown in fig. 6, the angle β 1 formed by the wall surface FWL of the lower ventral end LL1 with respect to the bottom BL in the lower groove portion 141b is made steeper, i.e., perpendicular to the bottom BL, than the angle β 2 formed by the wall surface BWL of the lower back end LL2 with respect to the bottom BL in the lower groove portion 141 b. Here, urine leaking from the lower abdomen-side end LL1 relatively easily reaches the abdomen-side end of the urine absorption pad 100 through the upper groove portion 141 a. By having the above configuration, it is possible to prevent urine from leaking from the lower abdomen-side end LL1 to the end in the abdomen-side direction of the urine absorption pad 100 through the upper groove portion 141 a. This can further guide urine into the lower absorbent body 140 b. As a result, the absorbent body 140 can be used closer to the capacity limit of the absorbent body 140 without urine leakage.
As is apparent from fig. 1 and 6, the distance between the upper ventral end LU1, which is the ventral end of the upper groove 141a, and the ventral end of the urine absorption pad 100 is smaller than the distance between the upper dorsal end LU2, which is the dorsal end of the upper groove 141a, and the dorsal end of the urine absorption pad 100. Therefore, in the present embodiment, as shown in fig. 6, the angle α 1 formed by the wall surface FWU of the upper ventral end LU1 with respect to the bottom BL in the upper groove portion 141a is steeper, i.e., perpendicular to the bottom BU, than the angle α 2 formed by the wall surface BWU of the upper dorsal end LU2 with respect to the bottom BL in the upper groove portion 141 a. Here, the urine leaking from the upper layer abdomen-side end LU1 relatively easily reaches the abdomen-side direction end of the urine absorption pad 100. By having the above configuration, it is possible to prevent urine from leaking from the upper abdomen-side end LU1 to the end of the urine absorption pad 100 in the abdomen-side direction. This can further guide urine into the lower absorbent body 140 b. As a result, the absorbent body 140 can be used closer to the capacity limit of the absorbent body 140 without urine leakage.
In the present embodiment, as shown in fig. 6 and 7, the angles β 1, β 2, β 3, and β 4 formed by the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove portion 141b with respect to the bottom surface BL in the lower groove portion 141b are steeper than the angles α 1, α 2, α 3, and α 4 formed by the wall surfaces FWU, BWU, SU1, and SU2 of the upper groove portion 141a with respect to the bottom surface BU in the upper groove portion 141a, i.e., are perpendicular to the bottom surfaces BU and BL. In other words, the wall surfaces FWU, BWU, SU1, and SU2 of the upper groove 141a are more gentle than the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove 141b with respect to the bottom surfaces BL and BU in the groove 141. Therefore, by forming the above configuration, the wall surfaces FWU, BWU, SU1, and SU2 of the upper groove portion 141a are relaxed, so that urine is more easily guided to the lower groove portion 141b via the upper groove portion 141a, and the temporarily guided urine is less likely to leak to the outside because the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove portion 141b are steep. Thus, by guiding urine through the lower layer and absorbing the urine in the lower layer absorber 140b, the return of the liquid to the upper layer absorber 140a can be prevented, and the absorber 140 can be used closer to the capacity limit of the absorber 140 while maintaining a dry feeling (reducing rewet) without urine leakage.
As is apparent from fig. 1, 6, and 7, the distance between the upper layer widthwise end WU1 in the widthwise direction W of the upper layer groove portion 141a and the one end in the widthwise direction W of the urine absorbent pad 100, and the distance between the upper layer widthwise end WU2 in the widthwise direction W of the upper layer groove portion 141a and the other end in the widthwise direction W of the urine absorbent pad 100 are smaller than the distance between the upper layer ventral end LU1 in the ventral direction of the upper layer groove portion 141a and the end in the ventral direction of the urine absorbent pad 100, and the distance between the upper layer dorsal end LU2 in the dorsal direction of the upper layer groove portion 141a and the end in the dorsal direction of the urine absorbent pad 100. In the present embodiment, as shown in fig. 6 and 7, the angles α 3 and α 4 formed by the wall surfaces SU1 and SU2 of the one and the other upper layer width direction ends WU1 and WU2 with respect to the bottom surface BU in the upper layer groove portion 141a are formed steeper and perpendicular to the bottom surface BU than the angle α 1 formed by the wall surface FWU of the upper layer ventral end LU1 with respect to the bottom surface BU in the upper layer groove portion 141a and the angle α 2 formed by the wall surface BWU of the upper layer dorsal end LU2 with respect to the bottom surface BU in the upper layer groove portion 141 a. With the above configuration, urine is less likely to leak from the upper layer width direction ends WU1 and WU2 to the end of the urine absorption pad. This can further guide urine into the lower absorbent body 140 b. As a result, rewet can be reduced, and the absorbent body 140 can be used closer to the capacity limit of the absorbent body 140 without urine leakage.
The measurement methods of the angles α 1 to α 4 and β 1 to β 4 are performed as follows. A fluoroscopy apparatus FLEX-M863 manufactured by BEAMSENSE (manufactured by Kyowa Kagaku Co., Ltd.) was used. The sample was cut into 20X 40mm with the trough as the center, and 360-degree scanning was performed while rotating the cut sample by 0.2 degrees each time. After that, 1800 images obtained by the capturing were linked to each other to create a 3D image. Then, a cross-sectional view in the longitudinal direction L and a cross-sectional view in the width direction W are extracted from the 3D image, and the angles α 1 to α 4 and β 1 to β 4 are measured from the respective views. Here, the bottom BU is a plane in which the non-skin side surface of the upper absorbent body 140a virtually extends through the through-hole when the upper groove portion 141a is a through-hole, and a plane in which the non-skin side surface of the lower absorbent body 140b virtually extends through the through-hole when the lower groove portion 141b is a through-hole. Therefore, the bottom surfaces BU and BL are parallel to each other.
In the present embodiment, the lower groove portion 141b of the absorbent core 144 penetrates in the thickness direction T. In this case, the absorbent core 144 is joined to the cover sheet 145 in a region surrounding the non-skin-side edge of the lower groove portion 141b (a ring-shaped region surrounding the through-hole of the lower groove portion 141b, at least the range of the upper groove portion 141a in plan view). According to such a configuration, since the region on the non-skin side surface 144sc surrounding the non-skin side edge of the lower groove portion 141b in the absorbent core 144 is bonded to the non-skin side portion 145sc of the cover sheet 145 with an adhesive, the position of the non-skin side edge of the lower groove portion 141b is fixed to the cover sheet 145. This allows the shape of lower groove portion 141b to be maintained regardless of the movement of the wearer and the flow of urine. This can maintain the performance of guiding urine to the lower absorbent layer, and the absorbent body 140 can be used closer to the capacity limit of the absorbent body 140.
In the present embodiment, the top sheet 120 is formed of a nonwoven fabric having a convex portion formed on the skin side surface. Fig. 8 is a partial perspective view of the top sheet 120 (nonwoven fabric). The top sheet 120 has ridges 122 (an example of a convex portion) formed on the skin-side surface 121. The ridge portions 122 extend in the longitudinal direction L, are arranged at predetermined intervals in the width direction W, and 1 groove portion 123 is formed between 2 adjacent ridge portions 122. Such a top sheet 120 is preferable because the excreted urine easily spreads in the longitudinal direction L along the ridges 122 and the grooves 123, and spreading of urine in the width direction W and leakage of urine from the urine absorption pad 100 due to spreading of urine can be prevented. Note that, in fig. 1, 1 ridge portion 122 is shown as a region between 2 adjacent lines, and 1 groove portion 123 is shown by 1 line. In addition, for the sake of simplicity of illustration, a part of the ridge-and-groove structure 124 formed on the skin-side surface 121 is omitted in fig. 1, and the ridge-and-groove structure 124 is omitted in fig. 2 to 4.
It is preferable that the content of the oriented fibers in the thickness direction T of the ridges 122 (protrusions) in the surface sheet 120 is greater than the content of the oriented fibers in the thickness direction T of the portions other than the protrusions in the surface sheet 120, and the wet thickness of the surface sheet 120 is 85% or more of the dry thickness of the surface sheet 120. Preferably, the top sheet 120 includes a1 st fiber layer having the skin-side surface 121 and a2 nd fiber layer located on the absorbent body side of the 1 st fiber layer, the 1 st fiber layer being composed of fibers having durable hydrophilicity, and the 2 nd fiber layer being composed of fibers having durable hydrophilicity and a fiber layer having non-durable hydrophilicity.
The ridge portion 122 has a thickness t1 of 0.3 to 1.5mm, for example, and a width w1 of 2.0 to 5.0mm, for example. On the other hand, the groove 123 has a thickness t2 of 0.1 to 0.5mm, and a width w2 of 1.0 to 3.0mm, for example. The thickness of the ridge portion was measured by placing a 100mm × 100mm surface piece sample cut out from the urine absorbent pad on a horizontal measuring table using a laser displacement meter (for example, a high-precision 2-dimensional laser displacement meter LJ-G series (model: LJ-G030) manufactured by KEYENCE corporation), measuring the displacement from the measuring table by the laser displacement meter for 5 different ridge portions, and taking the average value of the 5 measured values as the thickness (mm) of the ridge portion. Similarly, for 5 different grooves, the displacement from the measuring table was measured by a laser displacement meter, and the average of the 5 measured values was defined as the thickness (mm) of the groove. The width of the ridge portion is measured as the distance between the ridge portion and the boundary lines of the 2 groove portions located on both sides of the ridge portion based on a plane photograph or a plane image of the surface sheet sample in a non-pressurized state. The same applies to the width of the groove.
Since the top sheet 120 has the predetermined characteristics as described above and the ridges 122 (protrusions) are provided on the skin-side surface 121, even when the urine absorbent pad 100 absorbs a large amount of urine, the shape of the protrusions of the top sheet 120 can be maintained, clogging of the top sheet 120 due to the solid content of urine can be suppressed, and the absorbent body 140 can be used closer to the capacity limit of the absorbent body 140.
As a method for producing such a nonwoven fabric, for example, the method described in japanese patent No. 5683742 can be used. According to this method, in the manufacturing apparatus schematically shown in fig. 9, the fiber sheet W is placed on the air-permeable support member 310 (exemplified as a mesh-shaped support member), and the air-permeable support member 310 is moved in a predetermined direction, and the gas G is continuously ejected toward the upper surface of the fiber sheet W from the plurality of ejection ports 332 formed at the ejection portion 330 at predetermined intervals. The gas G having passed through the gas permeable support member 310 is sucked by the suction unit disposed below the ejection unit 330. In the area where the gas G is jetted on the upper surface of the fiber sheet W, the groove portions 123 extending in the moving direction of the air-permeable support member 310 are formed, and the ridge portions 122 are formed between the adjacent 2 groove portions 123. This enables the formation of the ridge-and-groove structure 124 in the fiber sheet W.
The oriented fibers in the thickness direction T are fibers oriented in an angle range of +45 degrees to-45 degrees with respect to the thickness direction T. The method of measuring the content of the oriented fibers in the thickness direction in a predetermined portion of the nonwoven fabric for the topsheet is as follows. (1) The nonwoven fabric was cut to prepare a nonwoven fabric sample. (2) An enlarged image of the nonwoven fabric sample from a direction perpendicular to the cut section was photographed using a digital microscope VHX-100 manufactured by KEYENCE. The magnified image is an image magnified to a magnification at which 50 or more fibers can be measured, and the magnification is, for example, 20 to 50 times. When the image is enlarged, the image is focused on the nearest fiber (except for the fibers that protrude forward irregularly) in the cut surface of the nonwoven fabric sample, and the image-capturing depth (depth) is set. The enlarged image is produced as a 3D image on a PC screen. (3) The 3D image is converted into a 2D image, a plurality of lines extending parallel to the thickness direction of the nonwoven fabric sample are drawn on the 2D image, and the number of fibers oriented at an angle of +45 degrees to-45 degrees with respect to the thickness direction of the nonwoven fabric sample is counted. (4) The ratio of the number of fibers counted to the number of all fibers in the measurement range was calculated. (5) The steps (1) to (4) are repeated a plurality of times (for example, 3 to 5 times), and the average value is defined as the content of the oriented fiber in the thickness direction.
For the measurement of the dry thickness and the wet thickness, a nonwoven fabric for a surface sheet, the state of which was adjusted in advance, was used. The condition of the nonwoven fabric is adjusted by storing the nonwoven fabric in a dry state for 24 hours or more in a standard state (temperature 23. + -. 2 ℃ C., relative humidity 50. + -. 5%). The nonwoven fabric in a dry state has a moisture content of usually 12% or less, preferably 10% or less. The thickness when dry is determined in the following manner. Using a thickness gauge (for example, FS-60DS manufactured by Daorhiki Seisakusho K.K., measuring cup area: 15 cm)2) For 3 different portions of the nonwoven fabric after the condition adjustment (when using a thickness gauge FS-60DS, the area of each portion is 15 cm)2) At a fixed pressure of 3g/cm2The pressing was performed, and the thickness of each part after 10 seconds of pressing was measured. The same measurement was performed for each of 10 nonwoven fabrics, and the average value of 30 measurement values in total was defined as the dry thickness of the nonwoven fabric. On the other hand, the thickness when wet was measured in the following manner. 10 test pieces (length 10 mm. times. width 10mm) cut from the nonwoven fabric after the conditioning were immersed in distilled water at 20 ℃ for 1 hour. Next, a thickness meter (for example, FS-60DS manufactured by Daorhiki Seisakusho K.K., Ltd.) was used to measure a sub-area of 15cm2) For 3 different portions of each test piece (when using a thickness gauge FS-60DS, the area of the portion is 15 cm)2) At a fixed pressure of 3g/cm2The pressing was performed, and the thickness of each part after 10 seconds of pressing was measured. The average value of the total of 30 measured values was defined as the wet thickness of the nonwoven fabric.
The urine absorption pad is suitable for absorbing urine of a person who is difficult to frequently change a diaper, such as a bedridden patient or a disabled person. The urine absorption pad can absorb urine up to the vicinity of the capacity allowed by the absorbent body, and thus can absorb urine many times without omission, for example, 3 times or more, preferably 4 times or more, and more preferably 5 times or more. The urine absorption pad can absorb 400mL or more, preferably 500mL or more, and more preferably 600mL or more without leakage in the absorption amount. For example, elderly people in bed (people over 65 years old) often excrete urine of about 3 times or more per night and count 400mL or more. Therefore, if the urine absorption pad can absorb at least 3 times or 400mL of urine, the number of times of replacement of the urine absorption pad at night becomes small. This makes it difficult for the elderly to suffer sleep peacefully at night, and the caretaker of the elderly can save the trouble of replacing the absorbent article at night, thereby reducing the burden involved in nursing and excretion.
According to the present invention, a urine absorption pad capable of absorbing urine close to the capacity allowed by an absorbent body while preventing the absorbent body from being out of shape is provided.
The absorbent article of the present invention is not limited to the above-described embodiments, and can be appropriately combined with, modified, and the like without departing from the object and the concept of the present invention.
Description of reference numerals
100 urine absorption pad
120 surface sheet
130 back sheet
140 absorbent body
140a upper absorber
140b lower absorber
141a upper groove part
144 absorbent core
145 cover sheet

Claims (11)

1. A urine absorption pad comprising a liquid-permeable front sheet, a liquid-impermeable back sheet, and an absorbent body located between the front sheet and the back sheet, and having a longitudinal direction, a width direction, and a thickness direction,
the absorber includes an upper absorber positioned on the skin side and a lower absorber positioned on the non-skin side,
the upper layer absorbent body has an upper layer groove portion extending in the longitudinal direction in the urination region and extending from one surface of the top sheet in the thickness direction toward the inside of the upper layer absorbent body,
the lower layer absorber comprises an absorbent core and a covering sheet covering the absorbent core,
wrapping the absorbent core with the cover sheet so that the non-skin side surface and both side surfaces in the width direction of the absorbent core are covered and the skin side surface of the absorbent core is covered with the cover sheet in a state where both end edges in the width direction of the cover sheet are overlapped with each other on the skin side of the absorbent core,
the skin side surface of the absorbent core is not joined to the cover sheet,
one of the longitudinal directions is a ventral direction, and the other is a dorsal direction,
a distance between one upper layer width direction end portion in the width direction of the upper layer groove portion and one width direction end portion of the urine absorbent pad, and a distance between the other upper layer width direction end portion in the width direction of the upper layer groove portion and the other width direction end portion of the urine absorbent pad are shorter than a distance between an upper layer abdomen side end portion in the abdomen side direction of the upper layer groove portion and the abdomen side end portion of the urine absorbent pad, and a distance between an upper layer back side end portion in the back side direction of the upper layer groove portion and the back side end portion of the urine absorbent pad,
the angle formed by the wall surface of the one and the other upper layer width direction end portions with respect to the bottom surface in the upper layer groove portion is closer to a perpendicular angle than the angle formed by the wall surface of the upper layer front side end portion with respect to the bottom surface in the upper layer groove portion and the angle formed by the wall surface of the upper layer back side end portion with respect to the bottom surface in the upper layer groove portion.
2. The urine absorption pad as set forth in claim 1,
the non-skin side surface of the upper layer absorbent body is not joined to the skin side surface of the cover sheet.
3. The urine absorption pad as claimed in claim 1 or 2,
the upper layer absorbent body is wider than the lower layer absorbent body in the width direction,
a portion wider than the lower absorbent body is joined to the back sheet.
4. The urine absorption pad as claimed in claim 1 or 2,
the weight per unit area of the adhesive between the front sheet and the back sheet at both ends of the urine absorbent pad in the longitudinal direction is larger than the weight per unit area of the adhesive between the front sheet and the back sheet except for the both ends of the urine absorbent pad.
5. The urine absorption pad as claimed in claim 1 or 2,
the upper layer groove portion of the upper layer absorber penetrates in the thickness direction,
the absorbent core of the lower absorbent layer has a lower groove portion extending in the longitudinal direction and recessed in the thickness direction in the urination region,
the lower groove portion and the upper groove portion overlap each other at least partially in the thickness direction.
6. The urine absorption pad as claimed in claim 5,
the lower layer groove portion of the absorbent core penetrates in the thickness direction,
the absorbent core is joined to the cover sheet in a region surrounding the non-skin-side end edge of the lower groove portion.
7. The urine absorption pad as claimed in claim 5,
one of the longitudinal directions is a ventral direction, and the other is a dorsal direction,
a distance between a lower abdomen-side end portion of the lower groove portion in the abdomen-side direction and an end portion of the urine absorbent pad in the abdomen-side direction is shorter than a distance between a lower back-side end portion of the lower groove portion in the back-side direction and an end portion of the urine absorbent pad in the back-side direction,
an angle formed by the wall surface of the lower ventral end with respect to the bottom surface in the lower groove is closer to a perpendicular angle than an angle formed by the wall surface of the lower dorsal end with respect to the bottom surface in the lower groove.
8. The urine absorption pad as claimed in claim 5,
an angle formed by the wall surface of the lower groove portion with respect to the bottom surface in the lower groove portion is closer to a vertical angle than an angle formed by the wall surface of the upper groove portion with respect to the bottom surface in the upper groove portion.
9. The urine absorption pad as claimed in claim 1 or 2,
one of the longitudinal directions is a ventral direction, and the other is a dorsal direction,
a distance between an upper abdomen-side end portion of the upper groove portion in the abdomen-side direction and the end portion of the urine absorbent pad in the abdomen-side direction is shorter than a distance between an upper back-side end portion of the upper groove portion in the back-side direction and the end portion of the urine absorbent pad in the back-side direction,
an angle formed by the wall surface of the upper ventral end with respect to the bottom surface in the upper groove is closer to a perpendicular angle than an angle formed by the wall surface of the upper dorsal end with respect to the bottom surface in the upper groove.
10. The urine absorption pad as claimed in claim 1 or 2,
the upper layer absorber and the lower layer absorber include a polymer absorber and pulp fibers,
the ratio of the basis weight of the polymeric absorbent to the basis weight of the total of the polymeric absorbent and the pulp fibers is greater in the upper layer than in the lower layer.
11. The urine absorption pad as claimed in claim 1 or 2,
the surface sheet is a nonwoven fabric having a convex portion formed on the skin side surface,
the nonwoven fabric has a content of the thickness direction oriented fibers of the convex portions larger than a content of the thickness direction oriented fibers of the portions other than the convex portions,
the thickness of the nonwoven fabric when wet is 85% or more of the thickness of the nonwoven fabric when dry.
CN201680086169.0A 2016-06-03 2016-10-13 Urine absorption pad Active CN109195559B (en)

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JP2016-112183 2016-06-03
JP2016112183A JP6117408B1 (en) 2016-06-03 2016-06-03 Urine pad
PCT/JP2016/080416 WO2017208476A1 (en) 2016-06-03 2016-10-13 Urine collection pad

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CN109195559B true CN109195559B (en) 2021-07-09

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JP7357497B2 (en) * 2019-09-24 2023-10-06 大王製紙株式会社 absorbent articles
JPWO2022071343A1 (en) * 2020-09-29 2022-04-07
CN112357293A (en) * 2020-10-23 2021-02-12 东台远东纸业有限公司 Horizontal pet urinal pad drawing box

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TWI619482B (en) 2018-04-01
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WO2017208476A1 (en) 2017-12-07
TW201742606A (en) 2017-12-16
CN109195559A (en) 2019-01-11

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