CN110603018A

CN110603018A - Absorbent article

Info

Publication number: CN110603018A
Application number: CN201880027022.3A
Authority: CN
Inventors: 户田温树; 村井隆将
Original assignee: Eunija Co Ltd
Current assignee: Eunija Co Ltd
Priority date: 2017-08-01
Filing date: 2018-04-13
Publication date: 2019-12-20
Anticipated expiration: 2038-04-13
Also published as: WO2019026354A1; JP2019025148A; JP6479107B2; TWI791516B; AU2018310177A1; CN110603018B; TW201909863A; AU2018310177B2

Abstract

The invention provides an absorbent article which is less likely to cause discomfort to a wearer and is less likely to cause skin diseases such as bedsores and macules. The absorbent article of the present invention is an absorbent article having a front sheet (5) and an absorbent body (6) and having a longitudinal direction, a width direction and a thickness direction, wherein the absorbent article further includes, at least in a back region (4), a low friction member (14) which is positioned on a skin-facing surface side of the front sheet (5) and has a plurality of openings (16) penetrating in the thickness direction, and a cover sheet (13) which is positioned on the skin-facing surface side of the low friction member (14), and further wherein each of the plurality of openings (16) has a specific structure having an opening peripheral portion (17) positioned on the skin-facing surface side and a rib portion (18) protruding from the opening peripheral portion (17) toward a non-skin-facing surface side.

Description

Absorbent article

Technical Field

The present invention relates to an absorbent article such as a diaper and a disposable diaper, and more particularly to an absorbent article in which skin diseases such as bedsores and macules are unlikely to occur on the skin of a wearer.

Background

In recent years, various methods have been studied for improving skin diseases such as bedsores and maculas (dermatitis) occurring on the skin of a wearer in absorbent articles such as diapers and disposable diapers.

As such an absorbent article, for example, patent document 1 discloses a disposable diaper with a bedsore prevention function, which includes an outer sheet, an absorbent body provided on the body side of the outer sheet, an inner sheet provided on the body side of the absorbent body, a left side sheet provided on the left side portion of the pad, a right side sheet provided on the right side portion of the pad, an overlapping sheet provided on the hip region, and a low-friction member having an opening provided between the overlapping sheet and the inner sheet, wherein the right side edge and the left side edge of the overlapping sheet are joined to the left side portion of the right side sheet and the right side portion of the left side sheet, respectively. The disposable diaper disclosed in patent document 1 can be manufactured at low cost, and the superposed sheet is easily moved relative to the inner sheet in the front-rear direction, so that it has a function of preventing the occurrence and deterioration of bedsores.

Prior art documents

Patent document

Patent document 1: japanese patent laid-open publication No. 2014-155609

Disclosure of Invention

Problems to be solved by the invention

However, if a liquid-impermeable low-friction member is provided on the body side (skin-facing surface side) of the inner sheet (topsheet) as in the absorbent article disclosed in patent document 1, when discharged liquid such as urine absorbed by the absorbent body located on the non-skin-facing surface side of the topsheet is discharged as moisture from the absorbent body by evaporation or the like, the portion covered with the liquid-impermeable low-friction member (more specifically, the portion other than the hole of the low-friction member) blocks the discharge of the moisture, and therefore, the wearer may easily feel a wet state or a moist-hot state due to the moisture being sealed, and a sense of incongruity may be caused. Further, when the opening is formed in the low friction member, when the excretion liquid such as urine absorbed by the absorbent body returns to the skin-facing surface side, the excretion liquid is likely to migrate to the skin-facing surface side through the opening of the low friction member, and therefore, the excretion liquid is likely to wet the skin of the wearer and cause the wearer to feel uncomfortable.

Further, if the skin (skin) of the wearer is kept wet by excretion liquid such as urine and moisture, the skin of the wearer is swollen, and it is difficult to maintain resistance to chemical and physical irritation (that is, the skin has a reduced defense function against various irritations), and if the skin in such a swollen state is subjected to a change in alkalinity due to an ammonia component derived from the excretion liquid such as urine (that is, to chemical irritation) or to physical irritation due to friction with a surface sheet, a displacement force, or the like, the skin cannot withstand such irritation, and skin diseases such as bedsores and macules (dermatitis) may be caused. In addition, since the wearer frequently sleeps on his back, such skin diseases are likely to occur particularly in the vicinity of the buttocks (particularly, in the vicinity of the sacrum) of the wearer.

Accordingly, an object of the present invention is to provide an absorbent article which is less likely to cause discomfort to a wearer and is also less likely to cause skin diseases such as bedsores and macules.

Means for solving the problems

One aspect (aspect 1) of the present invention is an absorbent article that includes a topsheet and an absorbent body positioned on a non-skin-facing surface side of the topsheet, and that has a longitudinal direction, a width direction, and a thickness direction, wherein,

the absorbent article has an abdomen region, a back region and a crotch region located between these two regions in the longitudinal direction in a plan view,

the absorbent article further includes, at least in the back region, a low friction member having a plurality of openings penetrating in the thickness direction and located on the skin-facing surface side of the topsheet, and a cover sheet located on the skin-facing surface side of the low friction member,

each of the plurality of openings has an opening peripheral edge portion positioned on the skin-facing surface side and a rib portion protruding from the opening peripheral edge portion toward the non-skin-facing surface side.

The absorbent article of embodiment 1 includes a low-friction member positioned on the skin-facing surface side of the topsheet and a cover sheet directly in contact with the skin of the wearer (specifically, the skin of the buttocks) in the back region corresponding to the buttocks of the wearer who is likely to develop skin diseases such as bedsores and macules, and since the low-friction member is interposed between the cover sheet and the topsheet, the frictional resistance is small, and therefore the cover sheet is likely to move in the planar direction relative to the topsheet. Thus, even if the wearer moves during wearing, the cover sheet can move in the in-plane direction together with the skin of the wearer in accordance with the movement of the wearer, and therefore the absorbent article of the present embodiment 1 is less likely to give physical stimulation due to friction or a biasing force to the skin of the wearer.

In the absorbent article according to mode 1, since the low-friction member has the rib portions that protrude from the opening peripheral edge portion toward the non-skin-facing surface side at each of the plurality of openings, the rib portions function as spacers between the low-friction member and the topsheet, and a space portion that serves as an air passage for discharging moisture generated by the excreted liquid such as urine can be formed between the low-friction member and the topsheet. Thus, in the absorbent article of the present embodiment 1, it is difficult for discharged liquid such as urine and moisture that returns to the skin-facing surface side to contact the skin of the wearer, and therefore it is difficult for the wearer to feel a wet state or a hot state, or for the skin (skin) of the wearer to be kept wet (that is, the skin of the wearer is in a swollen state).

As described above, the absorbent article of embodiment 1 is less likely to cause discomfort to the wearer and is also less likely to cause skin diseases such as bedsores and macules.

In the present specification, the "excretion liquid" to be absorbed by the absorbent article is not particularly limited as long as it can be absorbed and retained by an absorbent body described later, and includes, for example, a liquid such as urine, sweat, and blood, and a low viscosity material such as loose stool.

In another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the product of the height (hr) and the thickness (tr) of the rib is 2.0 × 10^-3mm²～5.0×10^-3mm²Within the range of (1).

In the absorbent article according to embodiment 2, the rib has a height (h) corresponding to the height of the rib_r) And thickness (t)_r) The product of (A) is 2.0X 10^-3mm²～5.0×10^-3mm²In the present invention, the specific structure within the range of (a) makes it difficult for the rib portions to be crushed in the thickness direction even when a force such as the body pressure of the wearer is applied in the thickness direction of the absorbent article, and the low friction member can function as a spacer between the low friction member and the topsheet while maintaining the low friction property (i.e., the state in which the frictional resistance between the cover sheet and the low friction member is small).

As a result, in the absorbent article of embodiment 2, it is difficult to apply physical stimulation due to friction or a biasing force to the skin of the wearer, and it is also difficult for the discharged liquid such as urine and its moisture that returns to the body to contact the skin of the wearer, so that the absorbent article can more stably exhibit the operational effects that it is difficult for the wearer to feel uncomfortable and it is also difficult for skin diseases such as bedsores and macules to be caused.

In another aspect (aspect 3) of the present invention, in the absorbent article according to aspect 1 or 2, the skin-facing surface of the opening peripheral edge portion is curved toward the non-skin-facing surface side.

In the absorbent article according to aspect 3, since the skin-facing surface of the opening peripheral edge portion is curved toward the non-skin-facing surface side in the opening portion of the low-friction member, the curved opening peripheral edge portion functions like a leaf spring even if the rib portion is crushed in the thickness direction in addition to being able to more strongly resist the force applied in the surface direction, and the rib portion is easily restored, and as a result, the space portion can be more reliably and continuously formed.

Further, since the skin-facing surface of the opening peripheral portion is curved toward the non-skin-facing surface, the opening peripheral portion is less likely to be caught by the cover sheet (particularly, the cover sheet moving in the planar direction), and the frictional resistance between the cover sheet and the low-friction member can be made smaller.

Therefore, the absorbent article according to embodiment 3 can more reliably and continuously exhibit the operational effects of the absorbent article according to embodiment 1 or 2.

In another aspect (aspect 4) of the present invention, in the absorbent article according to any one of aspects 1 to 3, a rigidity of a distal end portion of the rib portion on the non-skin facing surface side is higher than a rigidity of the opening peripheral edge portion.

In the absorbent article according to embodiment 4, the rigidity of the distal end portion of the rib portion is higher than the rigidity of the opening peripheral edge portion in the opening of the low-friction member, and the rib portion is less likely to deform, so that the space portion can be more reliably formed between the low-friction member and the topsheet even when a force is applied in the thickness direction or in the planar direction.

In another aspect (aspect 5) of the present invention, in the absorbent article according to any one of aspects 1 to 4, the distal end portions of the rib portions, which are located on the non-skin-facing surface side, are located inside the topsheet.

The absorbent article according to aspect 5 has a structure in which the distal end portions of the ribs are positioned inside the top sheet at the openings of the low-friction member (i.e., a structure in which the distal end portions of the ribs enter the top sheet), and therefore, the ribs are less likely to move or deform due to the anchor effect of this structure, and the space portions can be formed more stably and more reliably.

In still another aspect (aspect 6) of the present invention, in the absorbent article according to any one of aspects 1 to 5, the top sheet has an uneven structure in which ridges protruding toward the skin-facing surface side in the thickness direction of the absorbent article and continuously extending in the first direction and grooves recessed toward the non-skin-facing surface side in the thickness direction and continuously extending in the first direction are alternately arranged in a second direction orthogonal to a predetermined first direction.

The absorbent article according to mode 6 has a specific concave-convex structure in which the surface sheet has the ridges and the grooves, so that the ridges of the surface sheet can function as spacers between the low-friction member and the surface sheet in addition to the ribs of the low-friction member, and the space portions can be more reliably secured.

Further, in the absorbent article of the present embodiment 6, since the surface sheet has the recessed portions, the low-friction member and the surface sheet can be separated more widely (that is, the cross-sectional area in the thickness direction of the space portion can be ensured more widely), and therefore, it is difficult for the excretory fluid such as urine and the like and the moisture thereof absorbed by the absorbent body to reach the skin-facing surface side of the low-friction member (that is, to come into contact with the skin of the wearer), and it is possible to further prevent the wearer from feeling a moist state, a moist hot state, or a moist state.

In another aspect (aspect 7) of the present invention, in the absorbent article according to aspect 6, the distal end portions of the rib portions on the non-skin-facing surface side overlap the ridge portions in the thickness direction.

In the absorbent article of the present embodiment 7, the distal end portions of the ribs of the low friction member overlap the ridges of the top sheet in the thickness direction, and the low friction member and the top sheet can be separated more widely, so that it is more difficult for the excretory fluid such as urine and the moisture absorbed by the absorbent body to reach the skin-facing surface side of the low friction member. As a result, the absorbent article according to embodiment 7 can more effectively and reliably exhibit the operational effects of the absorbent article according to embodiment 6.

In another aspect (aspect 8) of the present invention, in the absorbent article according to aspect 6, a distal end portion of the rib portion on the non-skin facing surface side overlaps the recessed groove portion in the thickness direction.

In the absorbent article according to embodiment 8, the distal end portion of the rib of the low-friction member overlaps the groove of the top sheet in the thickness direction, and the movement of the rib in the surface direction can be restricted by the groove of the top sheet, so that the space formed between the low-friction member and the top sheet can be secured more stably and more reliably.

In another aspect (aspect 9) of the present invention, in the absorbent article according to any one of aspects 1 to 8, the absorbent article further includes an absorbent sheet containing a super absorbent polymer between the topsheet and the absorbent body, and the absorbent sheet overlaps the low friction member in the thickness direction.

The absorbent article according to embodiment 9 further includes an absorbent sheet containing a super absorbent polymer between the topsheet and the absorbent body at a position overlapping the low friction member in the thickness direction, and the absorbent sheet (more specifically, the super absorbent polymer contained in the absorbent sheet) swells when absorbing excretory fluid such as urine, so that the topsheet is pushed up toward the skin-facing surface side due to the swelling of the absorbent sheet, and the state in which the distal end portions of the rib portions of the low friction member enter the inside of the topsheet is easily established. Thus, in the absorbent article according to embodiment 9, even after absorption of the excretory fluid such as urine, the rib of the low-friction member is less likely to move or deform, and the space can be formed more stably and more reliably.

Further, the absorbent article according to embodiment 9 can exhibit more excellent absorption performance by including the absorbent sheet.

In another aspect (aspect 10) of the present invention, in the absorbent article according to any one of aspects 1 to 9, the absorbent body includes an upper absorbent layer located on a skin-facing surface side and a lower absorbent layer located on a non-skin-facing surface side, the upper absorbent layer includes an upper groove portion extending in the longitudinal direction in the crotch region and penetrating the upper absorbent layer in the thickness direction, and in the upper groove portion, an angle formed by each wall surface of the one end portion and the other end portion in the width direction and an imaginary bottom surface of the upper groove portion is closer to a vertical angle than an angle formed by each wall surface of the abdomen-side end portion and the back-side end portion in the longitudinal direction and an imaginary bottom surface of the upper groove portion.

In the absorbent article of the present embodiment 10, since the absorbent body includes the upper absorbent layer and the lower absorbent layer, and further the upper absorbent layer includes the upper groove portion having the above-described specific structure in the crotch region, the excretory fluid such as urine discharged from the wearer easily reaches the lower absorbent layer through the upper groove portion, and even in the case where the excretory fluid temporarily accumulates in the upper groove portion, the excretory fluid can be preferentially diffused in the longitudinal direction. Thus, in the absorbent article of the present embodiment 10, in addition to efficiently absorbing excretory fluid such as urine in a wide area of the absorbent body, the upper absorbent layer is interposed, so that the occurrence of liquid return of the excretory fluid absorbed by the lower absorbent layer is suppressed, and therefore, it is difficult for the excretory fluid such as urine and the moisture thereof to contact the skin of the wearer, and it is possible to further suppress the occurrence of a state in which the wearer feels moist, a state in which the wearer feels hot, or a state in which the skin of the wearer is moist.

In still another aspect (aspect 11) of the present invention, in the absorbent article according to any one of aspects 1 to 10, the low-friction member is formed of a resin sheet-like member containing high-density polyethylene at a ratio of 50% by mass or more.

In the absorbent article according to embodiment 11, the low friction member is formed of the resin sheet-like member containing the high density polyethylene at a ratio of 50 mass% or more, and therefore, the low friction member has a certain degree or more of hardness and a small frictional resistance, and the rib formed on the low friction member is more difficult to crush in the thickness direction, and the low friction property of the low friction member can be secured over a wide range. As a result, the absorbent article of the present embodiment 11 can more stably exhibit the function as a spacer between the low-friction member and the topsheet in the rib portion, and as a result, physical irritation due to friction and offset force is less likely to be imparted to the skin of the wearer, and it is more unlikely that leakage liquid such as urine that returns back to the liquid, and moisture thereof, will contact the skin of the wearer.

In another aspect (aspect 12) of the present invention, in the absorbent article according to aspect 11, the resin sheet-like member includes the high-density polyethylene and the low-density polyethylene at a mass ratio in a range of 50/50 to 75/25.

The absorbent article of embodiment 12 is a resin sheet-like member forming the low friction member, which contains high-density polyethylene and low-density polyethylene at a mass ratio in the range of 50/50 to 75/25, and therefore, when the sheet-like member is formed of a resin material, stress (i.e., internal residual stress) remaining inside the sheet-like member when the sheet-like member is formed with the opening can be reduced by the soft low-density polyethylene component, and rounding (i.e., curling) of the sheet-like member (particularly, the end portion in the width direction of the sheet-like member) due to relaxation of the internal residual stress can be suppressed. Accordingly, the cover sheet can move more smoothly on the low-friction member, and thus physical stimulation due to friction or a biasing force can be more hardly given to the skin of the wearer.

In another aspect (aspect 13) of the present invention, in the absorbent article according to any one of aspects 1 to 12, the top sheet and the low-friction member are at least partially joined together via a low initial adhesion adhesive having a probe initial adhesion test measurement value of 0.78N or less.

In the absorbent article of embodiment 13, the topsheet and the low-friction member are at least partially joined together via the low-tack adhesive having a probe tack test measurement value of 0.78N or less, and therefore the low-tack adhesive can fix the low-friction member to the topsheet without joining the low-tack adhesive to the cover sheet on the skin-facing surface side via the opening of the low-friction member. Thus, the absorbent article according to embodiment 13 can move the cover sheet more stably while suppressing positional displacement, peeling, and the like of the low friction member.

In another aspect (aspect 14) of the present invention, in the absorbent article according to any one of aspects 1 to 13, the low-friction member is formed of a sheet-like member having both ends in the width direction displaced toward the skin-facing surface side.

In the absorbent article of the present aspect 14, since both end portions in the width direction of the sheet-like member forming the low friction member are displaced toward the skin facing surface side, the cover sheet can be pushed toward the skin of the wearer by the displaced end portions toward the skin facing surface side, and the cover sheet can more accurately follow the movement of the skin of the wearer.

In another aspect (aspect 15) of the present invention, in the absorbent article according to any one of aspects 1 to 14, the absorbent article includes at least one folding line extending in the width direction for folding the absorbent article in an unfolded state in the longitudinal direction, and the low-friction member is disposed at a position not overlapping the folding line in a plan view.

In the absorbent article according to the present aspect 15, since the low friction member is disposed at a position not overlapping with the folding line for folding the absorbent article in the unfolded state in the longitudinal direction, the low friction member is not provided with a fold line extending in the width direction, and the absorbent article can be stored in a compact state in which the absorbent article is folded in the longitudinal direction in a package or the like while ensuring the ease of movement of the cover sheet particularly in the longitudinal direction.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article can be provided which is less likely to cause discomfort to the wearer and is also less likely to cause skin diseases such as bedsores and macules.

Drawings

Fig. 1 is a plan view of a diaper according to a first embodiment of the present invention, as viewed in a state in which the diaper is unfolded in the thickness direction from the side of the topsheet.

Fig. 2 is a sectional view of a section taken along line II-II of fig. 1 in the urine pad relating to the first embodiment of the present invention.

Fig. 3 is a sectional view of the diaper according to the first embodiment of the present invention, taken along the line III-III in fig. 1.

Fig. 4 is an enlarged sectional view of a main portion of the urine pad shown in fig. 2.

Fig. 5 is a perspective view of a low-friction member used in the diaper according to the first embodiment of the present invention.

Fig. 6 is an enlarged cross-sectional view of a main portion of a modification of the urine pad according to the first embodiment of the present invention.

Fig. 7 is a plan view of the urine pad according to the second embodiment of the present invention, viewed in a developed state in the thickness direction from the side of the topsheet.

Fig. 8 is an enlarged sectional view of a main portion of a diaper relating to a second embodiment of the present invention.

Fig. 9 is an enlarged sectional view of a main part of a modification of the urine pad according to the second embodiment of the present invention.

Fig. 10 is a plan view of a diaper according to a third embodiment of the present invention, viewed in a developed state in a thickness direction from a surface sheet side.

Fig. 11(a) is an enlarged cross-sectional view of a main portion of a urine pad according to a third embodiment of the present invention, and fig. 11(b) is an enlarged cross-sectional view of a main portion showing a state where an excretory fluid is absorbed in the urine pad according to the third embodiment of the present invention.

Fig. 12 is a plan view of a diaper according to a fourth embodiment of the present invention, viewed in a developed state in a thickness direction from a front sheet side.

Fig. 13 is a partial sectional view of a section taken along XIII-XIII in fig. 12 in the urine pad relating to the fourth embodiment of the present invention.

Fig. 14 is a partial sectional view of a section taken along the XIV-XIV line of fig. 12 in the urine pad relating to the fourth embodiment of the present invention.

Detailed Description

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In the present specification, without particular limitation, the term "an object (for example, an absorbent article, a topsheet, an absorber, a low-friction member, etc.) placed on a horizontal plane in a spread state as viewed from above in the vertical direction (the topsheet side in the case where the object is an absorbent article) in the thickness direction of the object" is simply referred to as "a top view".

The various directions and the like used in the present specification are not particularly limited, and the following are given.

In the present specification, "longitudinal direction" means a direction in which the length of a vertically long object (for example, an absorbent article, an absorber, or the like) is long in a plan view, "width direction" means a direction in which the length of the vertically long object is short (short side direction) in a plan view, "thickness direction" means a direction perpendicular to the object placed on a horizontal plane in a spread state, "and these longitudinal direction, width direction, and thickness direction are in a mutually orthogonal relationship. In the present specification, the "plane direction" refers to a direction in which a plane of a substantially sheet-like object (for example, an absorbent article, a topsheet, an absorbent body, a low friction member, a cover sheet, or the like) extends (i.e., a horizontal plane direction) in a plan view, and the plane direction and the thickness direction are orthogonal to each other.

Further, in the present specification, the term "in the longitudinal direction of a vertically long object" is defined with respect to a longitudinal central axis C which is located at the center in the longitudinal direction of the object and extends in the width direction_WThe relatively close side is referred to as "inner side in the longitudinal direction", and "in the longitudinal direction of the vertically long object, with respect to the longitudinal central axis C_WThe relatively distant side is referred to as "the outer side in the longitudinal direction". Similarly, the term "in the width direction of a vertically long object" is defined as a line which is located at the center in the width direction of the object and which is aligned with a width direction center axis C extending in the longitudinal direction_LThe relatively close side is referred to as "inner side in the width direction", and "in the width direction of the vertically long object, with respect to the width direction central axis C_LThe relatively distant side is referred to as "the widthwise outer side".

In the present specification, without particular limitation, in the thickness direction of the absorbent article, "the side relatively close to the skin surface of the wearer when the absorbent article is worn" is referred to as "skin-facing surface side", and "the side relatively far from the skin surface of the wearer when the absorbent article is worn" is referred to as "non-skin-facing surface side". Here, "wearing time" means a period (wearing period) during which the absorbent article is maintained from the time when the absorbent article is worn by the wearer (i.e., the time when the usable state is established).

In the present specification, the "surface on the skin-facing surface side" and the "surface on the non-skin-facing surface side" of various members (for example, a topsheet, an absorber, a low friction member, a cover sheet, and the like) constituting an absorbent article may be referred to as "skin-facing surface" and "non-skin-facing surface", respectively.

Fig. 1 is a plan view of a diaper 1 (absorbent article) according to a first embodiment of the present invention as viewed in a developed state in a thickness direction from a topsheet side, and fig. 2 and 3 are sectional views of the diaper 1 taken along lines II-II and III-III of fig. 1, respectively. Fig. 4 is an enlarged cross-sectional view of a main portion of the urine pad 1 shown in fig. 2, and fig. 5 is a perspective view of the low friction member 14 used in the urine pad 1.

As shown in fig. 1, the urine pad 1 according to the first embodiment of the present invention has a vertically long outer shape having a longitudinal direction L and a width direction W when viewed from above, and the urine pad 1 has a substantially hourglass shape in which a substantially central portion in the longitudinal direction L is constricted inward in the width direction W. In the present invention, the outer shape of the absorbent article is not limited to the outer shape of the above-described form, and an arbitrary vertically long shape (for example, a rectangle, an ellipse, a gourd-shape, or the like) can be adopted according to various applications if the outer shape is a long outer shape in which the length dimension in the longitudinal direction L is longer than the width dimension in the width direction W.

As shown in fig. 1, the urine pad 1 of the first embodiment includes, in order in a longitudinal direction L, an abdominal region 2 corresponding to the wearer's abdomen (more specifically, lower abdomen), a crotch region 3 corresponding to the wearer's crotch (more specifically, crotch), and a back region 4 corresponding to the wearer's back (more specifically, buttocks) in plan view.

As shown in fig. 2 and 3, the urine pad 1 has, as a basic structure, in the thickness direction T: is positioned on the skin-facing surface side S of the diaper 1₁Liquid ofA face sheet 5 and a non-skin-facing surface S on the face sheet 5₂The liquid-absorbent body 6 of (2), which is positioned on the skin-facing surface side S of the topsheet 5 in the back region 4₁A sheet-like low friction member 14 having a plurality of openings 16 penetrating in the thickness direction T, and a skin-facing surface side S of the low friction member 14 in the back region 4₁The cover sheet 13.

Further, in the first embodiment, the urine pad 1 further includes, as shown in fig. 1 to 3, both end portions in the width direction W of the urine pad 1 on the skin-facing surface side S₁The pair of side sheets (specifically, the one side sheet 8 disposed at one end in the width direction W and the other side sheet 9 disposed at the other end in the width direction W) of the diaper 1, and the non-skin-facing surface side S of the diaper 1₂And a liquid-impermeable leakage-preventing sheet 10 positioned between the absorbent body 6 and the back sheet 7. As shown in fig. 1 and 2, when the diaper 1 is worn, the end edge portions of the pair of side sheets on the inner side in the width direction W (i.e., the width direction inner side end edge portion 8R of the one side sheet 8 and the width direction inner side end edge portion 9L of the other side sheet 9) rise due to contraction of the elastic member 11 such as a rubber string, and a leakage preventing wall portion 12 for preventing leakage of an excretory fluid such as urine can be formed.

In this way, the urine pad 1 according to the first embodiment includes the back region 4 corresponding to the hip of the wearer who is likely to suffer from a skin disease such as bedsore or macule, and is positioned on the skin-facing surface side S of the topsheet 5₁The low-friction member 14 and the cover sheet 13 directly contacting the skin of the wearer (specifically, the skin of the buttocks) are less in frictional resistance by interposing the low-friction member 14 between the cover sheet 13 and the topsheet 5, and therefore the cover sheet 13 is easily moved in the planar direction relative to the topsheet 5. Thus, even if the wearer moves during wearing, the cover sheet 13 can move in the in-plane direction together with the skin of the wearer in accordance with the movement of the wearer, and therefore, the diaper 1 is less likely to give physical stimulation due to friction, a shifting force, or the like to the skin of the wearer.

In the first place, moreoverIn the embodiment, the low friction member 14 has a plurality of openings 16 penetrating in the thickness direction T, and the plurality of openings 16 are located on the skin facing surface side S in opposition to each other as shown in fig. 4 and 5₁And a non-skin-facing surface S facing a non-skin-facing surface S from the opening peripheral edge 17₂A projecting rib 18.

In the urine pad 1 according to the first embodiment, the low friction member 14 is provided in each of the plurality of openings 16 so as to extend from the opening peripheral edge 17 to the non-skin-facing surface S₂The protruding ribs 18 function as spacers between the low friction member 14 and the surface sheet 5, and the ribs 18 can form spaces S as ventilation paths between the low friction member 14 and the surface sheet 5, which spaces S can discharge moisture generated by the excretory fluid such as urine, as shown in fig. 4_P. Thus, the urine pad 1 returns to the skin-facing surface S₁The excretory fluid such as urine and the moisture thereof hardly contact the skin of the wearer, and therefore, it is difficult for the wearer to feel a wet state, a hot state, or a state in which the skin (skin) of the wearer is kept wet (that is, a state in which the skin of the wearer is swollen).

Therefore, the diaper 1 according to the first embodiment is less likely to cause discomfort to the wearer and also less likely to cause skin diseases such as bedsores and macules.

Next, various members constituting the absorbent article of the present invention will be described in more detail with reference to the urine pad 1 and the like relating to the above-described embodiments.

[ Low-friction Member ]

In the urine pad 1 according to the first embodiment, as shown in fig. 1, 2, and 4, the low friction member 14 is disposed between the topsheet 5 and the cover sheet 13 in the back region 4 of the urine pad 1, and can be disposed on the skin-facing surface side S in a reduced manner₁The cover sheet 13 is a low friction sheet member.

The low-friction member 14 has a substantially rectangular outer shape in plan view, which has a predetermined longitudinal direction length (for example, 100mm to 200mm) in the longitudinal direction L of the urine pad 1 and a predetermined width direction length (for example, 50mm to 150mm) in the width direction W of the urine pad 1. In the present invention, the outer shape (plan view shape) of the low friction member is not limited to this, and any outer shape (for example, circular, elliptical, polygonal, etc.) and size can be adopted as long as the frictional resistance with the cover piece can be reduced. The low-friction member may be formed of one sheet member as in the first embodiment, or may be formed of a plurality of sheet members divided in the longitudinal direction and/or the width direction. In this case, the plurality of sheet-like members constituting the low friction member are arranged at predetermined intervals in the longitudinal direction and/or the width direction, and if the plurality of sheet-like members are arranged in this manner, liquid permeability and air permeability are easily ensured.

In the present invention, the sheet-like member that can be used as the low friction member is not particularly limited as long as it is a low friction member that can reduce the frictional resistance with the cover sheet, and for example, the following can be used: a resin sheet-like member made of a resin or a resin composition having a low coefficient of friction, such as an olefin resin such as polyethylene or polypropylene, a fluororesin such as silicone resin or polytetrafluoroethylene; and a coated sheet member in which at least one surface (surface located on the skin-facing surface side in the absorbent article) of a base sheet made of a general-purpose thermoplastic resin such as an olefin resin such as polyethylene or polypropylene, or a polyester resin such as polyethylene terephthalate, or a thermoplastic resin composition is coated with a low-friction material having a low friction coefficient such as a silicone resin or a fluororesin.

In addition, in the present specification, the sheet member and the substrate sheet include, in addition to a sheet having a thin, flat structure or even a film: a sheet having an arbitrary structure such as a concavo-convex structure; fiber sheets such as woven cloth, nonwoven cloth, and knitted cloth; and a sheet-like structure in any form such as a laminate sheet in which these are combined arbitrarily.

When the resin sheet-like member is used as a low friction member, the resin sheet-like member preferably contains High Density Polyethylene (HDPE) at a ratio of 50 mass% or more, and more preferably contains High Density Polyethylene (HDPE) and Low Density Polyethylene (LDPE) at a mass ratio in the range of 50/50 to 75/25.

If the low friction member is formed of a resin sheet-like member containing high-density polyethylene at a ratio of 50 mass% or more, the low friction member has a certain degree or more of hardness due to the high-density polyethylene component and has a small frictional resistance, and therefore, it is more difficult to crush the rib portion of the opening formed in the low friction member in the thickness direction, and the low friction property of the low friction member can be secured over a wide range. Therefore, an absorbent article provided with such a resin sheet-like member as a low-friction member can more stably function as a spacer between the low-friction member and the topsheet in the rib portion, and as a result, it is difficult to give physical stimulation due to friction and offset force to the skin of the wearer, and it is also difficult for the discharged liquid such as urine that returns and its moisture to contact the skin of the wearer.

Furthermore, when the resin sheet-like member forming the low friction member is a resin sheet-like member containing high-density polyethylene and low-density polyethylene at a mass ratio in the range of 50/50 to 75/25, stress (i.e., internal residual stress) remaining in the sheet-like member when the sheet-like member is formed of a resin material and when the sheet-like member is formed with the opening can be reduced by the soft low-density polyethylene component, and therefore, the sheet-like member (particularly, the end portion in the width direction of the sheet-like member) can be prevented from being rounded (i.e., curled) due to relaxation of the internal residual stress. Therefore, since the cover sheet can move more smoothly on the low friction member, it is possible to further make it difficult for an absorbent article including such a resin sheet-like member as the low friction member to give physical irritation due to friction or a biasing force to the skin of the wearer.

In the present specification, the term "high-density polyethylene" means a polyethylene having a density of 0.942g/cm³The above polyethylene, low density polyethylene, means a density of 0.910g/cm³Above and below 0.930g/cm³The polyethylene of (1).

In addition, the friction material is used as a low friction memberIn the case of the coated sheet-like member, the coated sheet-like member can be formed by coating a predetermined amount (for example, about 0.6 g/m) on the surface of at least one of the base sheets made of the general-purpose thermoplastic resin or thermoplastic resin composition²～0.8g/m²In an amount within the range of (1) of a low-friction material such as silicone resin. When a silicone resin is used as the low-friction material, the form of the silicone resin is not particularly limited, and any form of silicone resin such as a solvent type, a solventless type, or an emulsion type can be used. However, when a plastic film made of the above-mentioned general-purpose thermoplastic resin or thermoplastic resin composition is used as the base sheet, the base sheet may be deformed or melted when the silicone resin is cured by heating, and therefore, it is preferable to use an ultraviolet-curable silicone resin. The method of coating the low friction material is not particularly limited, and any coating method such as a spray method, a roll method, or a dip method can be used.

The low friction member is not particularly limited in structure if it has low friction properties capable of reducing frictional resistance with the cover sheet disposed on the skin-facing surface side and has an opening described later, and any structure other than the above sheet-like member (for example, at least one elongated rod-like member, at least one belt-like member, or the like) can be used, but a sheet-like member having a generally flat structure as a whole as in the above embodiment is preferably used in consideration of the point that a low friction region can be secured over a wide range, the ease of slipping (ease of movement in the plane direction) of the cover sheet on the surface of the low friction member, the flexibility of the entire absorbent article, and the like.

The sheet-like member that can be used as the low-friction member is not limited to the sheet-like member having a generally flat structure as a whole as in the first embodiment, and the sheet-like member may be, for example, a sheet-like member in which both ends in the width direction of the absorbent article are warped (i.e., displaced) toward the skin-facing surface side. When both end portions in the width direction of the sheet-like member forming the low friction member are displaced toward the skin facing surface side, the cover sheet positioned on the skin facing surface side of the low friction member is pushed toward the skin of the wearer by the end portions displaced toward the skin facing surface side, and the cover sheet can be made to follow the movement of the skin of the wearer more accurately.

In the present invention, the static friction coefficient of the surface (at least the surface on the side facing the skin) of the low friction member is not particularly limited as long as the static friction coefficient is a static friction coefficient capable of securing a slip easiness to the extent that the cover sheet can move in the planar direction together with the skin of the wearer in accordance with the movement of the wearer, and is, for example, in the range of 0.04 to 0.80, preferably in the range of 0.10 to 0.50, and more preferably in the range of 0.10 to 0.40. Similarly, the dynamic friction coefficient of the surface of the low friction member is not particularly limited as long as it is a dynamic friction coefficient that ensures slip easiness to the extent that the cover sheet can move in the in-plane direction together with the skin of the wearer in accordance with the movement of the wearer, and is, for example, in the range of 0.10 to 0.75, preferably in the range of 0.10 to 0.55, and more preferably in the range of 0.10 to 0.45.

The static friction coefficient and the dynamic friction coefficient can be measured by the JIS P8147(b) horizontal method. For measuring the static friction coefficient and the dynamic friction coefficient, for example, as a test piece for a horizontal plate, a friction cotton cloth "interwoven No. 3 (bleached cotton cloth No. 3)" specified in JIS L0803 can be used, and as a test piece for a weight, a low friction member can be used.

In the present invention, the low friction member may be disposed so as to completely overlap the cover sheet in the thickness direction (that is, the low friction member and the cover sheet have the same plan view area), or may be disposed so as to include the cover sheet in plan view. In this case, the low friction member preferably has a planar surface area of a certain extent or less that is not exposed even when the cover sheet is moved in the planar direction, and for example, the planar surface area of the low friction member is in the range of 10% to 80%, preferably 20% to 60%, and more preferably 25% to 50% of the planar surface area of the cover sheet.

The position at which the low friction member is disposed is not particularly limited as long as it overlaps the cover sheet in a plan view, but is preferably substantially at the center of the cover sheet.

Further, in the absorbent article of the present invention, it is preferable that the absorbent article has at least one folding line extending in the width direction for folding the absorbent article in the unfolded state in the longitudinal direction, and in this case, the low friction member is preferably arranged at a position not overlapping with the folding line in a plan view. For example, in the first embodiment, the urine pad 1 has one fold line extending in the width direction W for folding the urine pad 1 in the expanded state in the longitudinal direction L (first fold line L in fig. 1) at each of the position on the abdomen side of the crotch region 3 and the position on the abdomen side of the back region 4₁And a second fold line L₂) The low friction member 14 is disposed at a position not overlapping these fold lines (specifically, at the back region 4 and the second fold line L)₂The position on the backrest side). When the low friction member is disposed at such a position not overlapping the folding line, no fold line extending in the width direction is added to the low friction member, and therefore, the absorbent article can be stored in a compact state in which the absorbent article is folded in the longitudinal direction in a package or the like while ensuring the ease of movement of the cover sheet particularly in the longitudinal direction.

In the urine pad 1 according to the first embodiment, the low-friction member 14 has a plurality of openings 16 penetrating the low-friction member 14 in the thickness direction T, as shown in fig. 2, 4, and 5. Each of the plurality of openings 16 has a substantially circular outer shape in plan view, and is arranged in a zigzag shape on the surface of the low friction member 14. In the absorbent article of the present invention, the outer shape and arrangement form of the opening of the low friction member are not particularly limited as long as the effects of the present invention are not impaired, and the opening may have an outer shape having any shape other than a circular shape in a plan view (for example, a line-symmetrical shape such as an oval shape, a square shape, or a hexagonal shape), or may be arranged in any arrangement form such as a multi-row shape or a lattice shape. The plurality of openings may have the same outer shape for all the openings, may have different outer shapes for some of the openings, or may have different outer shapes for all the openings.

Further, as shown in fig. 4 and 5, the plurality of openings 16 in the low friction member 14 are provided on the skin-facing surface side S of the low friction member 14₁The peripheral edge of the opening 16 having an opening on the surface, i.e., the thickness t of the base portion 14b other than the opening 16 of the low friction member 14_b(the base portion 14b has a portion of substantially constant thickness in the low friction member 14, which is the same as the "thickness of the low friction member") and a portion of small thickness (in fig. 4, the portion of the low friction member 14 surrounded by the broken line) is divided into an opening peripheral portion 17 and a non-skin-facing surface S from the opening peripheral portion 17₂A protruded rib portion 18, the opening portion 16 having a surface S facing the skin along the thickness direction T₁To the non-skin facing side S₂The aperture (i.e., the diameter of the opening) is narrowed. The rib 18 has a distal end 18T thereof facing the skin-facing surface S of the topsheet 5₁Are connected.

In the urine pad 1, the rib 18 has a rib height (h)_r) And thickness (t)_r) The product of (A) is 2.0X 10^-3mm²～5.0×10^-3mm²Specific structure within the range of (1).

Here, the protrusion height (h) of the rib_r) As shown in FIG. 4, the reference surface is a skin-facing surface of the base portion 14b, which is a portion other than the opening portion of the low friction member 14, and the reference surface and the side S of the rib 18 closest to the non-skin-facing surface are shown₂The distance (mm) in the vertical direction between the end portions 18T of (b), the thickness (T) of the rib portion_r) Shown in the rib 18, corresponds to the protrusion height (h) of the rib_r) 1/2 (i.e., from the above-mentioned reference plane or end)The distance in the vertical direction from the end 18T is the protrusion height (h) of the rib_r) 1/2 (mm).

In the present invention, the protrusion height (h) of the rib formed in the opening of the low friction member_r) And the thickness (t) of the rib_r) The height (h) of the rib is not particularly limited as long as the effect of the present invention is not impaired, and may be, for example, the height of the protrusion (h) of the rib_r) In the range of 0.05mm to 1.2mm, it is preferable that the protrusion height in the range of 0.1mm to 0.5mm can be adopted, and the thickness (t) of the rib portion_r) Is in the range of 0.001mm to 0.1mm, and preferably can be in the range of 0.005mm to 0.05mm, but preferably the rib portion has a rib height (h) as in the urine pad 1_r) And thickness (t)_r) The product of (A) is 2.0X 10^-3mm²～5.0×10^-3mm²And further, more preferably has the above product of 2.2X 10^-3mm²～4.8×10^-3mm²A structure within the range of (1).

When the rib formed in the opening of the low friction member has the above-described specific structure, even when a force such as the body pressure of the wearer is applied in the thickness direction of the absorbent article, the rib is less likely to be crushed in the thickness direction, and the rib can more stably function as a spacer between the low friction member and the topsheet while maintaining the low friction property of the low friction member (i.e., a state in which the frictional resistance between the cover sheet and the low friction member is small). As a result, in the absorbent article including the low-friction member having the rib portion having the specific structure, it is difficult to apply physical stimulation due to friction or a biasing force to the skin of the wearer, and it is difficult for the discharged liquid such as urine and moisture that returns to the body to contact the skin of the wearer.

The thickness of the low friction member (i.e., the distance between the skin-facing surface and the non-skin-facing surface of the base portion, which is the portion other than the opening portion of the low friction member) is not particularly limited as long as the effects of the present invention are not impaired, and any thickness (for example, a thickness in the range of 0.01mm to 1.0 mm) can be adopted in consideration of flexibility, strength, and the like.

In the present specification, the thickness of the low friction member, the protrusion height of the rib, and the thickness of the rib can be measured by using an arbitrary noncontact type measuring instrument such as a laser displacement meter or the like, or by observing the cross section under magnification using a scanning electron microscope or the like. In addition, the thickness of the low friction member, the protrusion height of the rib, and the thickness of the rib are averaged from any five different measurement values in consideration of the influence of measurement errors and the like.

In the first embodiment, as shown in fig. 4, the opening peripheral edge portion 17 of the opening portion 16 is directed toward the non-skin-facing surface S as going toward the opening center of the opening portion 16₂Bent and integrally connected to the rib 18. Thus, when the skin-facing surface of the opening peripheral edge portion 17 faces the non-skin-facing surface S₂In the case where the rib 18 is bent, even when a force is applied in the planar direction due to the wearer' S movement or the like, the rib 18 can more strongly resist the force in the planar direction, and even if the rib 18 is crushed in the thickness direction T, the bent opening peripheral edge portion 17 acts like a leaf spring, and the rib 18 is easily restored, so that the space S can be formed more reliably and more continuously_P。

Further, the skin-facing surface of the peripheral edge 17 faces the non-skin-facing surface S₂The opening peripheral edge 17 is less likely to be caught by the cover sheet 13 (particularly, the cover sheet 13 moving in the planar direction) due to bending, and the frictional resistance between the cover sheet 13 and the low friction member 14 can be made smaller.

In the present invention, the opening diameter (mm) of the opening portion of the low friction member is not particularly limited, for example, the opening diameter (d) of the opening peripheral portion₁) The opening diameter (d) of the end of the rib is in the range of 0.01mm to 5.0mm₂) In the range of 0.005mm to 4.5 mm.

Here, the opening diameter (d) of the opening peripheral edge portion₁) As shown in the figureAs shown in fig. 4, the opening diameter is defined as the opening diameter at the reference position at the boundary between opening peripheral edge 17 and the portion other than opening 16 (i.e., base portion 14b), and specifically, is defined as the diameter of an inscribed circle (the largest circle among circles inscribed in the plane view) in the plane view drawn by the boundary between opening peripheral edge 17 and base portion 14 b. Similarly, the opening diameter of the rib end is, as shown in fig. 4, the diameter of an inscribed circle of a plan view pattern drawn by the end portion 18T of the rib 18. These aperture diameters can be measured by observing the surface or cross section of the aperture under magnification using any magnifying observation means such as a microscope or a scanning electron microscope.

In the first embodiment, the rib 18 of the opening 16 is formed by heating a low-friction member forming material (for example, a resin sheet-like member, a base sheet, or the like) on a suction drum having a plurality of suction holes in the peripheral surface thereof to suck the material in the thickness direction and perforate the material (that is, form the opening peripheral edge) as shown in fig. 4, and therefore, the rib 18 is formed toward the non-skin-facing surface S in the thickness direction T₂The thickness is reduced, and the density is relatively high. Thus, the rib 18 is positioned on the non-skin-facing surface side S₂The rigidity of the distal end portion 18T is relatively higher than the rigidity of the opening peripheral edge portion 17. As described above, if the rigidity of the distal end portion 18T of the rib 18 is higher than the rigidity of the opening peripheral edge portion 17, a certain strength can be secured at the distal end portion 18T in contact with the surface sheet 5, and the rib 18 is less likely to deform, so that the space S can be more reliably formed between the low friction member 14 and the surface sheet 5 even when a force is applied in the thickness direction T or the surface direction as described above_P. In the present invention, the means for increasing the rigidity of the distal end portion of the rib portion is not limited to the above-described densification, and the rigidity of the distal end portion of the rib portion may be increased by using a high-strength material, a high-strength structure, or the like.

In the present invention, the means for forming the opening portion in the low friction member is not particularly limited, and for example, the low friction member forming material (for example, a resin sheet-like member, a base material sheet, or the like) can be perforated at a portion corresponding to the suction hole in the low friction member forming material by the suction force of the suction drum while heating the low friction member forming material on the suction drum having the plurality of suction holes in the peripheral surface thereof and sucking the material in the thickness direction, or the low friction member forming material can be perforated by using a roll-like or flat-plate-like mold member having a plurality of holes or recesses having a diameter substantially equal to the opening diameter of the opening peripheral portion and an arbitrary perforation processing apparatus or gear processing apparatus having a roll-like or flat-plate-like mold member having a plurality of projections (for example, needle-like projections or the like) for perforation having a diameter sufficiently small to form the rib portion (that is substantially equal to the opening diameter of the end of the rib portion, the low friction member forming material is sandwiched between these mold members and pressed to form the hole while punching the hole, whereby the opening peripheral edge portion and the rib portion can be formed simultaneously.

In addition, the protruding height (h) of the rib_r) And the thickness (t) of the rib_r) The suction force and the heating temperature of the suction drum can be adjusted, or the distance between the inner circumferential surface of the hole portion of the mold member and the outer circumferential surface of the piercing protrusion can be adjusted to be within a predetermined range. Further, the opening may be formed by forming a plurality of through holes in the low friction member forming material using an arbitrary piercing member, and then pressing the peripheral edge of the through holes to a predetermined shape by an arbitrary forming method such as compression forming or vacuum forming, thereby forming the rib having the specific structure.

In the diaper 1 according to the first embodiment, the rib 18 of the opening 16 is in contact with the skin-facing surface of the topsheet 5 at the distal end portion 18T thereof, but the absorbent article of the present invention is not limited to this configuration. Here, fig. 6 is an enlarged cross-sectional view of a main portion of a modification of the urine pad 1 relating to the first embodiment. In fig. 6, the configuration other than the configuration different from that of the first embodiment is basically the same as that of the first embodiment, and therefore, the description thereof is omitted.

In the modification shown in fig. 6, the rib 18 of the opening 16 is positioned on the non-skin-facing surface side S₂Is located inside the front sheet 5. The diaper 1 according to this modification is lowIn the opening 16 of the friction member 14, since the structure is provided in which the distal end portion 18T of the rib 18 is positioned inside the surface sheet 5 (i.e., the structure in which the distal end portion 18T of the rib 18 enters the surface sheet 5), the rib 18 is less likely to move or deform due to the anchor effect of the structure, and the space S can be formed more stably and more reliably_P。

In the present invention, the low-friction member is preferably joined to the surface sheet by an arbitrary joining member such as a hot-melt adhesive, and particularly preferably joined to the surface sheet at the tip end of the rib in the opening. The joining member may be applied continuously or intermittently in the longitudinal direction and/or the width direction of the absorbent article, but when the joining member is applied intermittently, the air permeability is easily ensured, and the generation of hot flashes in the absorbent article is difficult.

Preferably, the surface sheet and the low friction member are at least partially joined together via a low initial adhesion adhesive having a value of 0.78N or less as measured by a probe initial adhesion test. When the top sheet and the low friction member are at least partially joined by such a low tack adhesive, the low tack adhesive is not joined to the cover sheet located on the skin-facing surface side through the opening of the low friction member, and the low friction member can be fixed to the top sheet.

The measurement value of the probe tack test can be measured using any test apparatus of the probe tack type (for example, a tack tester manufactured by mitsubishi corporation).

[ cover sheet ]

Next, the cover sheet used in the absorbent article of the present invention will be described. In the diaper 1 according to the first embodiment, as shown in fig. 1, 2, and 4, the cover sheet 13 is disposed so as to overlap the low friction member 14 in the thickness direction T in the back region 4 of the diaper 1 and be positioned on the skin-facing surface side S of the low friction member 14₁And the low friction member 14 is included as a whole, so that the low friction member 14 is not exposed in a plan view. The cover sheet 13 is as described aboveSince the sheet can move in the in-plane direction together with the skin of the wearer in accordance with the movement of the wearer, it is possible to make it difficult to give physical stimulation due to friction, offset force, or the like to the skin of the wearer.

The cover sheet 13 has a substantially rectangular outer shape in plan view, which has a predetermined longitudinal direction length in the longitudinal direction L of the urine pad 1 and a predetermined width direction length in the width direction W of the urine pad 1, and is long in the longitudinal direction L. In the present invention, the outer shape of the cover piece is not limited to this form, and any outer shape (for example, a circle, an ellipse, a polygon, or the like) can be adopted as long as the low friction member can be covered as a whole.

In the diaper 1 according to the first embodiment, as shown in fig. 1 and 2, the cover sheet 13 has one end portion 13L in the width direction W joined to the inner side portion 8S of the one side sheet 8 closer to the width direction inner side end edge portion 8R, and has the other end portion 13R in the width direction W joined to the inner side portion 9S of the other side sheet 9 closer to the width direction inner side end edge portion 9L. As shown in fig. 1, the cover piece 13 and the side pieces are joined to each other from one end to the other end in the longitudinal direction L of the cover piece 13, and a joint portion 15 extending in the longitudinal direction L is formed. In the first embodiment, the cover sheet 13 does not extend to both ends in the width direction W of the urine pad 1.

In this way, since the cover sheet 13 is joined to the pair of side sheets having a large degree of freedom of movement capable of forming the leakage preventing wall portion 12 and is not directly fixed to the main body portion of the urine pad 1 (here, the main body portion of the urine pad 1 is a portion composed of the front sheet 5, the absorbent body 6, the leakage preventing sheet 10, and the back sheet 7), it is difficult for the main body portion of the urine pad 1 to restrict the movement of the cover sheet 13, and instead, the cover sheet 13 is easily moved relative to the main body portion of the urine pad 1 by being joined to the side sheets having a large degree of freedom of movement.

Further, since the cover sheet 13 is joined to the pair of side sheets capable of forming the leakage preventing wall portion 12 during wearing, the cover sheet 13 rises from the front sheet 5 and lowers due to the widthwise inner side end edge portions of the pair of side sheets rising during wearing of the diaper 1The friction member 14 faces the skin-facing surface S₁The friction resistance is less likely to occur between the cover pieces 13 and the low friction members 14 due to the floating, and the force in the thickness direction T is less likely to be applied to the low friction members 14.

In the absorbent article of the present invention, the cover sheet may be directly fixed to the main body of the absorbent article, provided that the movement of the cover sheet is not restricted. That is, the cover sheet may be sufficiently bent to the extent that the gather can be formed, and joined to the main body portion (more specifically, the topsheet and the backsheet) of the absorbent article so that the movement thereof is not restricted.

The size of the joining portion 15 between the cover sheet 13 and each side sheet in the width direction W is not particularly limited as long as the cover sheet 13 can be joined with a joining strength enough to prevent the cover sheet 13 from falling off during wearing of the diaper 1, but is preferably within a range of 5 to 30mm, more preferably within a range of 10 to 25mm, and still more preferably within a range of 15 to 20 mm.

The joining method of the cover sheet and each side sheet is not particularly limited, and any joining method using a hot-melt adhesive, hot-melt, or the like can be used.

In the first embodiment, the cover sheet 13 is disposed only in the back region 4 of the urine pad 1 so as to correspond to the vicinity of the buttocks (particularly, the vicinity of the sacrum) of the wearer who is likely to suffer from a skin disease such as bedsore or macule, but the absorbent article of the present invention is not limited to such an arrangement form, and the cover sheet may be disposed not only in the back region but also in a part of the abdominal region or the crotch region where the skin disease can occur.

Further, in the first embodiment, as shown in fig. 1, the cover sheet 13 is disposed such that the back side edge portion 13B of the cover sheet 13 extends to the back side edge portion 1B of the urine pad 1. By disposing the cover sheet in this way, the absorbent article of the present invention does not need to have a component, but the cover sheet is preferably extended to a position as close to the back side as possible of the absorbent article. When the cover sheet is extended to such a position, the vicinity of the buttocks of the wearer, where skin diseases are likely to occur, can be covered more widely, and therefore, the above-mentioned skin diseases can be further made difficult to occur.

The size of the cover sheet is not particularly limited when the cover sheet can function as a cover sheet, and the length of the cover sheet in the longitudinal direction is, for example, in the range of 25% to 100%, preferably in the range of 30% to 80%, and more preferably in the range of 40% to 70% of the length of the back region 4 in the longitudinal direction. In addition, when the outer shape of the cover piece is a shape other than a rectangle, the length in the longitudinal direction indicates the maximum length in the longitudinal direction of the shape.

On the other hand, the width-directional length of the cover sheet is, for example, in the range of 50mm to 250mm, preferably 80mm to 200mm, and more preferably 100mm to 180mm, in consideration of the range of the portion where skin diseases are likely to occur, the ease of leakage of excretory fluid, and the like. In addition, when the outer shape of the cover piece is a shape other than a rectangle, the width direction length indicates the maximum length of the shape in the width direction.

In the present invention, the material constituting the cover sheet is not particularly limited, and for example, it is possible to adopt: nonwoven fabrics such as hot air nonwoven fabrics and spun bond nonwoven fabrics; a fabric; weaving; a plastic film, and the like. The sheet member may be either hydrophilic or hydrophobic. Since the cover sheet used in the present invention is a cover sheet that can be brought into direct contact with the skin of the wearer, a sheet member having excellent skin touch and flexibility is preferably used among the above sheet members. Examples of such sheet-like members include nonwoven fabrics such as hot-air nonwoven fabrics and spunbond nonwoven fabrics. The sheet member constituting the cover sheet is preferably a sheet member having excellent hydrophobicity in view of making it difficult to moisturize the skin of the wearer (specifically, the skin of the buttocks). Further, even when a hydrophilic material is used as the sheet member constituting the cover sheet, it is possible to transmit excretory fluid such as urine and moisture thereof to some extent, and therefore, there is an advantage that it is possible to make it difficult to seal the excretory fluid such as urine and moisture thereof between the skin of the wearer and the cover sheet.

The cover sheet may be formed of a sheet member that is stretchable in at least one direction. When the cover sheet is formed of such a sheet-like member that can expand and contract at least in one direction, the cover sheet can easily follow the movement of the buttocks of the wearer when the buttocks of the wearer move, and can move with the buttocks more accurately.

Further, if the stretchable direction of the cover sheet is parallel to the longitudinal direction of the absorbent article, the cover sheet can be accurately moved together with the buttocks even when the buttocks of the wearer are displaced forward during getting up or using a wheelchair, and therefore, physical stimulation due to the friction, the offset force, or the like can be more reliably made less likely to be given, and as a result, skin diseases such as bedsores, macules, or the like can be more reliably made less likely to be generated.

The sheet-like member that can be stretched in at least one direction is not particularly limited as long as it is a member having stretchability in at least one direction, and for example, the following can be used: nonwoven fabric or woven or knitted fabric containing elastic fiber; a nonwoven fabric having a surface on which ridge portions and groove portions are alternately formed (i.e., a nonwoven fabric having a ridge-groove structure); gear-stretched nonwoven fabric; a nonwoven fabric or woven or knitted fabric provided with an elastic member; and a laminate obtained by arbitrarily combining these components. Among these, a nonwoven fabric having a ridge-and-groove structure is stretchable in a direction perpendicular to the direction in which the ridge portions and the groove portions extend, and therefore, the nonwoven fabric is not only stretchable but also has a small contact area with the skin of the wearer and causes little physical irritation to the skin, and therefore, it is particularly preferably usable as a patch.

[ side sheet ]

Next, a pair of side sheets used in the absorbent article of the present invention will be described. In the diaper 1 according to the first embodiment, as shown in fig. 1 to 3, the pair of side sheets are disposed on the skin-facing surface side S of the topsheet 5₁The diaper 1 includes a belt-shaped one-side sheet 8 disposed at one end in the width direction W of the diaper 1 and a belt-shaped other-side sheet 9 disposed at the other end in the width direction W of the diaper 1. As shown in FIG. 1, the one side sheet 8 and the other side sheet 9 are arranged from the abdomen-side edge in the longitudinal direction L of the diaper 1 in a plan viewThe portion 1A extends over the back side end edge portion 1B, and as shown in fig. 2, the widthwise outer side end edge portion 8L of the one side sheet 8 and the widthwise outer side end edge portion 9R of the other side sheet 9, which are positioned on the outer side in the width direction W, are joined to one side end edge portion and the other side end edge portion in the width direction W of the leakproof sheet 10, respectively, to form fixed ends, while the widthwise inner side end edge portion 8R of the one side sheet 8 and the widthwise inner side end edge portion 9L of the other side sheet 9, which are positioned on the inner side in the width direction W, are not joined to any members, and form free ends.

As described later, since the leakproof sheet is not an essential component of the absorbent article of the present invention, when the absorbent article does not include the leakproof sheet, the pair of side sheets may be joined to one end edge portion (one end edge portion 7L in the first embodiment) and the other end edge portion (the other end edge portion 7R in the first embodiment) in the width direction of the back sheet.

In the first embodiment, as shown in fig. 1 and 3, the elastic members 11 for causing the one side sheet 8 and the other side sheet 9 to contract in the longitudinal direction L and raising the width direction inner side end edge portions are disposed in the longitudinal direction L in the vicinity of the width direction inner side end edge portions 8R and the width direction inner side end edge portions 9L, respectively, in the first embodiment. The widthwise inner side end edge portions of the one side sheet 8 and the other side sheet 9 are raised by contraction of the elastic member 11, and form a leakage preventing wall portion 12 for preventing leakage of an excretion liquid such as urine in the widthwise direction.

In the first embodiment, the elastic member 11 is disposed over a wide range from the abdomen region 2 to the back region 4 in the longitudinal direction L of the diaper 1 as shown in fig. 1, but the arrangement form of the elastic member is not particularly limited in the present invention. For example, the elastic member may be disposed over the entire length of the pair of side sheets in the longitudinal direction, or may be disposed within a predetermined range other than the vicinity of the front side end edge and the vicinity of the rear side end edge in the longitudinal direction of the pair of side sheets, as in the above-described embodiment. Further, if the elastic member is disposed as in the latter, there is an advantage that the end portion in the longitudinal direction of the absorbent article is hard to bend backward.

The elongation ratio when attaching the elastic member to the pair of side sheets is not particularly limited as long as the cover sheet is not excessively pulled and leakage of the excretory fluid is less likely to occur, and is, for example, in the range of 1.3 to 3.0 times, preferably in the range of 1.5 to 2.5 times, and more preferably in the range of 1.7 to 2.3 times, with respect to the natural length of the elastic member. In the first embodiment, the elastic members 11 are disposed one on each of the widthwise inner side end edge portions 8R of the one side sheet 8 and the widthwise inner side end edge portions 9L of the other side sheet 9, but the present invention is not limited to such an arrangement, and two or more elastic members may be disposed on each of the pair of side sheets. As the elastic member, a rubber thread or the like generally used for absorbent articles such as a diaper and a disposable diaper can be used.

In the first embodiment, the pair of side sheets (i.e., the one side sheet 8 and the other side sheet 9) are each formed of a liquid-impermeable sheet having a long belt-like outer shape extending in the longitudinal direction L of the diaper 1 as shown in fig. 1, but the pair of side sheets are not limited to this form in the present invention, and a liquid-impermeable sheet having an arbitrary outer shape and size can be used as long as it is a side sheet capable of forming a predetermined leakage-preventing wall portion.

The belt-like liquid-impermeable sheet that can be used as the side sheet is not particularly limited as long as it has predetermined liquid impermeability and flexibility, and for example, any liquid-impermeable sheet such as a hydrophobic nonwoven fabric (for example, a hydrophobic or hydrophobic spunbonded nonwoven fabric, a point-bonded nonwoven fabric, a spunbonded layer/meltblown layer/spunbonded layer (SMS) nonwoven fabric, or the like), a liquid-impermeable synthetic resin film, and a laminate thereof can be used.

The weight per unit area and the thickness of the belt-shaped liquid-impermeable sheet (for example, hydrophobic nonwoven fabric) that can be used as the side sheet are not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area and thickness in consideration of liquid impermeability, flexibility, and the like can be adopted.

Although the provision of such a side sheet is not an essential component of the absorbent article of the present invention, the provision of such a side sheet in the absorbent article has an advantage that leakage of excretory fluid such as urine can be more effectively suppressed particularly in the width direction of the absorbent article, and the cover sheet is joined to make it difficult to generate frictional resistance between the cover sheet and the low-friction member and to apply a force in the thickness direction to the low-friction member as described above.

[ surface sheet ]

Next, the topsheet used in the absorbent article of the present invention will be described. In the diaper 1 according to the first embodiment, as shown in fig. 1 to 3, the topsheet 5 is arranged at a position (i.e., the skin-facing surface side S of the diaper 1) that can be in direct contact with the skin of the wearer, except for the portion overlapping the cover sheet 13 and the low friction member 14 in the thickness direction T₁The position (b) of the sheet, and is composed of a liquid-permeable sheet through which excretory fluid discharged from the wearer can pass.

As shown in fig. 1 to 3, the topsheet 5 extends in the longitudinal direction L and the width direction W so as to cover the non-skin-facing surface S of the topsheet 5 when viewed in plan₂The absorbent body 6 (2) has a vertically long substantially rectangular outer shape that is long in the longitudinal direction L of the diaper 1. In the absorbent article of the present invention, the outer shape of the topsheet is not limited to this form, and any topsheet having any outer shape and size can be used according to various applications, if the skin-facing surface of the absorbent body disposed on the non-skin-facing surface side of the topsheet is not exposed at least in the crotch region.

The liquid-permeable sheet that can be used as the top sheet is not particularly limited as long as it has predetermined liquid permeability, skin touch, and the like, and for example, any nonwoven fabric such as a spunbond nonwoven fabric, a through-air nonwoven fabric, and an SMS nonwoven fabric formed using cellulose fibers, hydrophilized thermoplastic resin fibers, and the like can be used.

In the absorbent article of the present invention, the structure of the top sheet is not particularly limited as long as it has a predetermined liquid permeability, a texture to the skin, and the like, and may be a top sheet having a substantially flat structure like the top sheet 5 of the first embodiment described above, or a top sheet having a predetermined uneven structure like the top sheet of the second embodiment described below.

The weight per unit area and the thickness of the liquid-permeable sheet (nonwoven fabric or the like) that can be used as the top sheet are not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area and thickness can be used in consideration of liquid permeability, skin touch, and the like.

The top sheet may be joined to the non-skin-facing surface of the pair of side sheets, may be joined to the skin-facing surface or the non-skin-facing surface of the absorbent body, or may be joined to the leakproof sheet or the skin-facing surface of the back sheet. The joining method is not particularly limited, and any joining method such as hot melt adhesive or hot melt can be used.

[ absorbent body ]

Next, an absorbent body used in the absorbent article of the present invention will be described. In the urine pad 1 according to the first embodiment, as shown in fig. 1 to 3, the absorbent member 6 is disposed between the front sheet 5 and the back sheet 7 (more specifically, the leakproof sheet 10) in the thickness direction T of the urine pad 1, and is composed of an absorbent member that absorbs and retains the excretory fluid of the wearer who has passed through the front sheet 5.

As shown in fig. 1, the absorber 6 extends from the abdomen area 2 (specifically, near the abdomen-side end edge 1A in the longitudinal direction L) to the back area 4 (specifically, near the back-side end edge 1B in the longitudinal direction L) in the urine pad 1, extends from near one end edge in the width direction W to near the other end edge in the width direction W in the urine pad 1, and has a substantially hourglass shape that is long in the direction along the longitudinal direction L of the urine pad 1 and is constricted in the substantially central portion in the longitudinal direction inward in the width direction in a plan view. In the present invention, the outer shape of the absorbent body (absorbent member) is not limited to this form, and any outer shape such as a rectangular shape or an oblong shape may be provided as long as the absorbent body can exhibit a predetermined absorption performance.

The position in plan view at which the absorber is disposed is not particularly limited as long as it is a position including the center portion of the absorbent article including the widthwise central axis C extending in the lengthwise direction L, and the absorber may be disposed so as to be biased toward one side in the lengthwise direction of the absorbent article_LAnd a longitudinal central axis C extending in the width direction W_WThe intersection point of (a).

In the present invention, the absorbent member that can be used as the absorbent body is not particularly limited as long as it can absorb and retain excretory fluid such as urine, and any known absorbent member can be used in the art. Examples of such an absorbent member include an absorbent member in which an absorbent core made of an absorbent material is covered with a core wrap sheet such as a hydrophilic tissue. Here, examples of the absorbent material constituting the absorbent core include hydrophilic fibers, super absorbent polymers, and the like, and more specifically, the following are listed: pulverizing cellulose fiber such as pulp, cotton, rayon, and acetate fiber; a granular material comprising a highly absorbent polymer such as a sodium acrylate polymer; and mixtures thereof in any combination, and the like.

In the present invention, the absorbent body may be configured by a multi-layer absorbent body in which two or more absorbent layers are stacked in the thickness direction, as in the embodiment described later. In this case, each absorbent layer can be formed of the absorbent member described above. The absorbent body having a multilayer structure will be described in detail in other embodiments of the present invention described later.

The weight per unit area and the thickness of the absorbent member that can be used as an absorbent body are not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area and thickness in consideration of absorbency, flexibility, and the like can be used.

[ Back sheet ]

Next, a back sheet used for the absorbent article of the present invention will be described. In the urine pad 1 according to the first embodiment, as shown in fig. 1 to 3, the back sheet 7 is disposed on the non-skin-facing surface side S in the thickness direction T of the urine pad 1₂The position (b) is constituted by a hydrophobic nonwoven fabric or a liquid-impermeable sheet having a predetermined air permeability and functioning so as to prevent the passage of excretory fluid such as urine excreted from the wearer and not to leak the excretory fluid to the outside (for example, clothing worn by the wearer).

As shown in fig. 1 to 3, the back sheet 7 extends from the abdomen-side end edge portion 1A to the back-side end edge portion 1B in the longitudinal direction L of the urine pad 1 and from one side end edge portion to the other side end edge portion in the width direction W of the urine pad 1 in a plan view, and has a substantially hourglass external shape similar to the external shape of the urine pad 1. In the present invention, the shape of the back sheet is not limited to this, and a back sheet having an arbitrary shape and size can be used for various applications if the back sheet is arranged such that the non-skin-facing surface of the absorbent body on the skin-facing surface side of the back sheet is not exposed.

In the present invention, the hydrophobic nonwoven fabric that can be used as the back sheet is not particularly limited as long as it has predetermined hydrophobicity, air permeability, and the like, and any hydrophobic nonwoven fabric such as a spunbond nonwoven fabric, a point-bond nonwoven fabric, a meltblown nonwoven fabric, an SMS nonwoven fabric (a nonwoven fabric having a multilayer structure (e.g., a five-layer structure) of three or more nonwoven fabric layers including a spunbond layer, a meltblown layer, and a spunbond layer), a through-air nonwoven fabric, and the like can be used. The hydrophobic nonwoven fabric may not have liquid impermeability when the absorbent article includes the leakproof sheet between the back sheet and the absorbent body, but when the absorbent article does not include the leakproof sheet between the back sheet and the absorbent body, the hydrophobic nonwoven fabric having liquid impermeability is preferably used.

The constituent fibers of the hydrophobic nonwoven fabric are not particularly limited, and for example, the following fibers can be used: polyolefin fibers such as polyethylene and polypropylene; polyester fibers such as polyethylene terephthalate; thermoplastic resin fibers such as various composite fibers including core-sheath composite fibers. Furthermore, the weight per unit area and the thickness of the hydrophobic nonwoven fabric are not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area and thickness in consideration of air permeability and the like can be used.

On the other hand, the liquid-impermeable sheet that can be used as the back sheet is not particularly limited as long as it is a liquid-impermeable sheet having a predetermined liquid-impermeability, and for example, any liquid-impermeable sheet such as a plastic film made of a thermoplastic resin such as polyethylene can be used. A liquid-impermeable sheet (for example, a plastic film having a plurality of openings) having liquid-impermeability and a certain air permeability is preferably used as the liquid-impermeable sheet.

In the first embodiment, the urine pad 1 includes the liquid-impermeable leakproof sheet 10 between the back sheet 7 and the absorbent member 6. The leakproof sheet 10 is made of a plastic film made of a thermoplastic resin such as polyethylene, and functions to prevent leakage of excretory fluid such as urine excreted from a wearer to the outside by preventing the excretory fluid from passing through. Although the provision of such a leakage-preventing sheet is not an essential component of the absorbent article of the present invention, the leakage of excretory fluid such as urine can be more effectively suppressed if the absorbent article is provided with a leakage-preventing sheet.

In the present invention, the position where the leakproof sheet is arranged is not particularly limited as long as the leakproof sheet can function, and the leakproof sheet may be arranged from the abdomen region to the back region of the absorbent article as in the first embodiment, or may be arranged only in a specific region such as the crotch region.

Next, another embodiment (second embodiment) of the present invention in which only the configuration of the front sheet is different from that of the first embodiment will be described with reference to the drawings. Since the configuration other than the configuration different from that of the first embodiment is basically the same as that of the first embodiment, the description thereof is omitted.

Fig. 7 is a plan view of the urine pad 1 according to the second embodiment of the present invention as viewed in a state where the front sheet 5 is unfolded in the thickness direction T, and fig. 8 is an enlarged sectional view of a main portion of the urine pad 1 according to the second embodiment. As shown in fig. 7 and 8, the top sheet 5 of the diaper 1 according to the second embodiment of the present invention has an uneven structure 19, and in the uneven structure 19, the surface side S of the diaper 1 faces the skin-facing surface in the thickness direction T₁A projected strip portion 19A projecting and continuously extending in the longitudinal direction L of the diaper 1 and a non-skin-facing surface side S in the thickness direction T of the diaper 1₂The recessed portions 19B, which are recessed and extend continuously in the longitudinal direction L of the urine pad 1, are alternately arranged in the width direction W of the urine pad 1.

In the urine pad 1 according to the second embodiment, since the surface sheet 5 has the specific uneven structure 19, and the specific uneven structure 19 has the ridges 19A and the grooves 19B, the ridges 19A of the surface sheet 5 can function as spacers between the low friction member 14 and the surface sheet 5 in addition to the ribs 18 of the low friction member 14, and the space S can be ensured more reliably_P. Furthermore, in the urine pad 1 according to the second embodiment, since the top sheet 5 has the concave grooves 19B, the low friction member 14 and the top sheet 5 can be separated more greatly (that is, the space S can be made larger_PIs ensured to be larger in the thickness direction T), it is difficult for the excretory fluid and the moisture thereof absorbed by the absorbent body 6 to reach the skin-facing surface side S of the low friction member 14₁Further, it is possible to make it more difficult to cause a wet state, a hot state, or a wet state of the skin of the wearer.

In the absorbent article of the present invention, the direction in which the ridges and grooves of the top sheet extend is not limited to the second embodiment, and the ridges and grooves may extend in any direction such as the width direction of the absorbent article.

In the diaper 1 according to the second embodiment, the low friction member 14 is disposed on the non-skin-facing surface side S of the rib 18 as shown in fig. 8₂The distal end portion 18T of (2) overlaps the ridge portion 19A of the front sheet 5 in the thickness direction T of the urine pad 1. As described above, when the distal end portions 18T of the rib portions 18 of the low friction member 14 overlap the ridges 19A of the top sheet 5 in the thickness direction T, the low friction member 14 and the top sheet 5 can be separated more greatly, and therefore, it is more difficult for the excretory fluid such as urine and the moisture absorbed by the absorbent body 6 to reach the skin-facing surface side S of the low friction member 14 and reach the skin-facing surface side S thereof₁. Thus, the diaper 1 according to the second embodiment can more effectively and reliably exhibit the above-described operational effects (that is, the operational effects can be further reduced in the case where the wearer feels wet, hot, or the skin of the wearer is wet).

In the diaper 1 according to the second embodiment, the low friction member 14 is disposed on the non-skin-facing surface side S of the rib 18₂The distal end portion 18T of (2) overlaps the ridge portion 19A of the front sheet 5 in the thickness direction T of the urine pad 1, but the arrangement form of the low friction member in the absorbent article of the present invention is not limited to this form. Here, fig. 9 is an enlarged cross-sectional view of a main part of a modification of the urine pad 1 according to the second embodiment of the present invention. In fig. 9, the configuration other than the configuration different from that of the second embodiment is basically the same as that of the second embodiment, and therefore, the description thereof is omitted.

In the modification shown in fig. 9, the low friction member 14 is disposed so that the rib 18 is positioned on the non-skin-facing surface side S as shown in fig. 9₂The distal end portion 18T of (2) overlaps the groove portion 19B of the topsheet 5 in the thickness direction T of the urine pad 1. In this way, when the distal end portion 18T of the rib portion 18 of the low friction member 14 overlaps the recessed groove portion 19B of the surface sheet 5 in the thickness direction T, the recessed groove of the surface sheet 5 can be formedThe space S formed between the low friction member 14 and the front sheet 5 can be secured more stably and more reliably because the portions 19B restrict the movement of the ribs 18 in the plane direction_P。

In the present invention, when the uneven structure of the topsheet is an uneven structure in which ridges projecting in the thickness direction of the absorbent article toward the skin-facing surface side and continuously extending in a predetermined first direction and grooves recessed in the thickness direction toward the non-skin-facing surface side and continuously extending in the first direction are alternately arranged in a second direction orthogonal to the first direction, the structure on the non-skin-facing surface side is not particularly limited, and the uneven structure may be formed substantially flat as in the second embodiment, or the grooves and ridges corresponding to the ridges and grooves may be formed (that is, the cross-sectional structure in the second direction of the topsheet may be formed in a substantially wavy shape).

The method for imparting the uneven structure to the surface sheet is not particularly limited, and for example, any shaping method such as a method of continuously blowing a gas (e.g., air) to the web, a compression molding method, and a gear drawing method can be employed.

Next, another embodiment (third embodiment) of the present invention, which is different from the first embodiment only in that an absorbent sheet is provided, will be described with reference to the drawings. Since the configuration other than the configuration different from that of the first embodiment is basically the same as that of the first embodiment, the description thereof is omitted.

Fig. 10 is a plan view of the urine pad 1 according to the third embodiment of the present invention, viewed in a state developed in a thickness direction T from the side of the topsheet 5, fig. 11(a) is an enlarged cross-sectional view of a main portion of the urine pad 1 according to the third embodiment, and fig. 11(b) is an enlarged cross-sectional view of a main portion showing a state in which the urine pad 1 according to the third embodiment absorbs excretory fluid. As shown in fig. 10 and 11(a), the urine pad 1 according to the third embodiment of the present invention further includes an absorbent sheet 20 containing a super absorbent polymer between the topsheet 5 and the absorbent body 6.

As shown in fig. 10, the absorbent sheet 20 has a substantially rectangular outer shape that is long in the longitudinal direction L in a plan view, and has a predetermined longitudinal length (for example, 100mm to 200mm) extending from the crotch region 3 to the back region 4 of the urine pad 1 and a predetermined width length (for example, 100mm to 200mm) extending in the width direction W so as to cover most of the absorbent body 6. In the absorbent article of the present invention, the outer shape of the absorbent sheet is not limited to this form, and an absorbent sheet having an arbitrary outer shape (for example, a circular shape, an oval shape, a polygonal shape, or the like) according to a desired absorption performance or the like can be used.

In the urine pad 1 according to the third embodiment, as shown in fig. 10 and 11(a), the absorbent sheet 20 is arranged so as to extend from the crotch region 3 to the back region 4 of the urine pad 1 in a plan view, and so as to overlap the low-friction member 14 in the thickness direction T in the back region 4. When the absorbent sheet 20 is disposed so as to overlap the low friction member 14 in the thickness direction T, the absorbent sheet 20 swells when the absorbent sheet 20 (more specifically, the super absorbent polymer contained in the absorbent sheet 20) absorbs excretory fluid such as urine, and the topsheet 5 is directed toward the skin-facing surface side S₁Therefore, as shown in fig. 11(b), the distal end portions 18T of the ribs 18 of the low friction member 14 are easily pushed up into the front sheet 5. Thus, even after the urine pad 1 according to the third embodiment absorbs excretory fluid such as urine, the rib 18 of the low friction member 14 is less likely to move or deform, and the space S can be formed more stably and more reliably_P. Further, the urine pad 1 according to the third embodiment can exhibit more excellent absorption performance by including the absorbent sheet 20.

In the present invention, the absorbent sheet is not particularly limited as long as it is a sheet-like member containing a super absorbent polymer, and examples thereof include an absorbent sheet in which a super absorbent polymer such as a sodium acrylate polymer is covered with a covering sheet such as a hydrophilic tissue. The absorbent sheet may contain an absorbent material similar to the absorbent body, in addition to the super absorbent polymer.

The weight per unit area and the thickness of the absorbent sheet are not particularly limited as long as the effects of the present invention are not impaired, and any weight per unit area and thickness can be adopted in consideration of desired absorption performance, flexibility, and the like.

Next, a fourth embodiment, which is another embodiment of the present invention in which only the structure of the absorber is different from that of the first embodiment, will be described with reference to the drawings. Since the configuration other than the configuration different from that of the first embodiment is basically the same as that of the first embodiment, the description thereof is omitted.

Fig. 12 is a plan view of the urine pad 1 according to the fourth embodiment of the present invention, viewed in a developed state from the side of the topsheet 5 toward the thickness direction T, fig. 13 is a partial sectional view of the urine pad 1 according to the fourth embodiment, taken along the line XIII-XIII in fig. 12, and fig. 14 is a partial sectional view of the urine pad 1 according to the fourth embodiment, taken along the line XIV-XIV in fig. 12.

As shown in FIGS. 12 to 14, the urine pad 1 according to the fourth embodiment of the present invention includes an absorbent body 6 positioned on the skin-facing surface side S in the thickness direction T₁And the upper side absorbent layer 61 and the side S not facing the skin₂The lower absorbent layer 62. The upper absorbent layer 61 has a substantially hourglass shape which is formed long in the direction along the longitudinal direction L of the urine pad 1 and the crotch region 3 is contracted inward in the width direction in a plan view, and the lower absorbent layer 62 has a substantially rectangular shape which is formed long in the direction along the longitudinal direction L of the urine pad 1 and has a width direction length smaller than the minimum width direction length of the upper absorbent layer 61 in a plan view.

The upper absorbent layer 61 has upper groove portions 61S extending in the longitudinal direction L in the crotch region 3 and penetrating the upper absorbent layer 61 in the thickness direction T. The upper groove portion 61S is positioned in the crotch region 3 of the diaper 1 and passes through the center of the absorbent body 6 in the width direction W (i.e., is positioned on the width direction center axis C extending in the longitudinal direction L), as shown in FIG. 12_LUpper), extending in the longitudinal direction L. Thus, the upper groove 61S is formed in the upper layer and wornSince the excretory fluid such as urine discharged by the wearer is supplied at a position corresponding to the supply position, the excretory fluid such as urine discharged by the wearer can be quickly introduced into the lower absorbent layer 62 through the upper groove portions 61S before being spread on the topsheet 5 (i.e., before the skin-facing surface of the urine pad 1 is hardly soiled).

Further, in the fourth embodiment, the lower absorbent layer 62 includes a lower groove portion 62S which is provided in the crotch region 3 so as to extend in the longitudinal direction L and which penetrates the lower absorbent layer 62 in the thickness direction T. The lower groove portion 62S is positioned in the crotch region 3 of the diaper 1 and passes through the center of the absorbent body 6 in the width direction W (i.e., is positioned on the width direction center axis C extending in the longitudinal direction L), as shown in FIG. 12_LAbove), extending in the longitudinal direction L, and formed to overlap the upper-layer groove portion 61S in the thickness direction T (i.e., overlap in a plan view). Therefore, the discharged excretory fluid such as urine can be quickly drawn into the lower absorbent layer 62 through the upper groove 61S of the upper absorbent layer 61 and the lower groove 62S of the lower absorbent layer 62.

The absorbent article of the present invention is not necessarily provided with the configuration in which the lower absorbent layer has the lower groove portion penetrating through the lower absorbent layer in the thickness direction, and the lower absorbent layer may not have the lower groove portion, or may be formed as a concave portion recessed in the thickness direction from the skin-facing surface side toward the non-skin-facing surface side of the lower absorbent layer.

In the fourth embodiment, the upper groove portion 61S and the lower groove portion 62S are formed so that their positions coincide with each other in a plan view (that is, both the groove portions communicate with each other in the thickness direction). Therefore, the absorbent body 6 is provided with the groove portions 6S in which the upper groove portions 61S and the lower groove portions 62S overlap in the thickness direction T. Thus, in the present fourth embodiment, the absorbent body 6 can draw discharged excretory fluid such as urine into the lower absorbent layer 62 through the upper groove portion 61S of the upper absorbent layer 61 and the lower groove portion 62S of the lower absorbent layer 62 quickly, and furthermore, by interposing the upper absorbent layer 61, it is possible to prevent the occurrence of liquid returning of the excretory fluid such as urine absorbed by the lower absorbent layer 62.

The length in the longitudinal direction L and the length in the width direction W in plan view of the upper groove portion 61S and the lower groove portion 62S (hereinafter, the length in the longitudinal direction of the groove portion is simply referred to as "length", and the length in the width direction of the groove portion is simply referred to as "width") can be arbitrarily sized in consideration of the size of the upper absorbent layer 61 and the lower absorbent layer 62 from the viewpoint of desired absorption performance, flexibility, and the like. For example, the width of the upper groove portion 61S is usually in the range of 5.0 to 50mm, preferably in the range of 10 to 20 mm. Similarly, the width of the lower groove portion 62S is equal to or narrower than the width of the upper groove portion 61S, and is usually in the range of 5.0 to 40mm, preferably in the range of 10 to 15 mm. The length of the upper groove portion 61S is usually in the range of 50 to 300mm, preferably in the range of 50 to 200mm, and more preferably in the range of 50 to 150 mm. Similarly, the length of the lower groove portion 62S is equal to or shorter than that of the upper groove portion 61S, and is usually within a range of 30 to 250mm, preferably within a range of 30 to 150 mm. The width and length of the upper groove portion 61S are equal to or greater than the width and length of the lower groove portion 62S, so that the size of the groove portion 6S in a plan view of the absorbent body 6 can be kept substantially constant even if a slight shift occurs due to a step of laminating the upper absorbent layer 61 and the lower absorbent layer 62, a movement during wearing, or the like. Further, since a step is generated on the inner wall surface of the groove portion 6S and the surface area of the groove portion 6S is increased, the absorption performance of the absorbent body 6 in the portion where the groove portion 6S is formed can be improved.

Here, the groove portion 6S of the absorbent body 6 in the fourth embodiment will be described in more detail.

As shown in fig. 13 and 14, the upper groove portion 61S includes: a pair of wall surfaces arranged facing each other in the width direction W along the longitudinal direction L, that is, a wall surface SU1 of one end WU1 in the width direction W and a wall surface SU2 of the other end WU2 in the width direction W; and a pair of wall surfaces disposed facing each other in the longitudinal direction L along the width direction W, that is, a wall surface FWU of the abdomen-side end LU1 in the longitudinal direction L and a wall surface BWU of the back-side end LU2 in the longitudinal direction L, and the lower groove portion 62S includes: a pair of wall surfaces arranged facing each other in the width direction W along the longitudinal direction L, that is, a wall surface SL1 of one end WL1 in the width direction W and a wall surface SL2 of the other end WL2 in the width direction W; and a pair of wall surfaces arranged facing each other in the longitudinal direction L along the width direction W, that is, a wall surface FWL of the abdomen-side end portion LL1 in the longitudinal direction L and a wall surface BWL of the back-side end portion LL2 in the longitudinal direction L. In fig. 13, the left side is the front side (abdomen side) in the longitudinal direction L, and the right side is the rear side (back side) in the longitudinal direction L.

The virtual bottom BU of the upper groove portion 61S is a plane virtually extending so that the non-skin-facing surface of the upper absorbent layer 61 faces the upper groove portion 61S, which is a through hole. Similarly, the virtual bottom surface BL of the lower groove 62S is a plane virtually extending from the non-skin-facing surface of the lower absorbent layer to the lower groove 62S as the through hole. Therefore, the virtual bottom BU of the upper groove 61S and the virtual bottom BL of the lower groove 62S are parallel to each other.

In the urine pad 1 according to the fourth embodiment, as shown in fig. 12 and 13, the distance between the abdomen-side end LL1 of the lower groove portion 62S in the longitudinal direction L and the abdomen-side end edge portion 1A of the urine pad 1 is shorter than the distance between the back-side end LL2 of the lower groove portion 62S in the longitudinal direction L and the back-side end edge portion 1B of the urine pad 1.

Further, in the urine pad 1 according to the fourth embodiment, as shown in fig. 13, an angle β 1 formed by the wall surface FWL of the abdomen-side end portion LL1 in the longitudinal direction L of the lower groove portion 62S and the virtual bottom BL of the lower groove portion 62S is formed more steeply at a perpendicular angle with respect to the virtual bottom BL than an angle β 2 formed by the wall surface BWL of the back-side end portion LL2 in the longitudinal direction L of the lower groove portion 62S and the virtual bottom BL of the lower groove portion 62S. For example, when the wearer takes a posture such as standing or sitting, if the excretory fluid such as urine discharged from the wearer leaks from the abdomen-side end LL1 in the longitudinal direction L of the lower groove portion 62S, the leaking excretory fluid tends to flow toward the abdomen-side end edge 1A of the urine pad 1 through the upper groove portion 61S, but by forming the lower groove portion 62S as described above, the excretory fluid such as urine leaking from the abdomen-side end LL1 in the longitudinal direction L of the lower groove portion 62S can be made difficult to flow toward the abdomen-side end edge 1A of the urine pad 1.

In the urine pad 1 according to the fourth embodiment, as shown in fig. 12 and 13, the distance between the abdomen-side end LU1 of the upper groove portion 61S and the abdomen-side end edge portion 1A of the urine pad 1 in the longitudinal direction L is shorter than the distance between the back-side end LU2 of the upper groove portion 61S and the back-side end edge portion 1B of the urine pad 1 in the longitudinal direction L.

Further, in the urine pad 1 according to the fourth embodiment, as shown in fig. 13, the angle α 1 formed by the wall surface FWU of the abdomen-side end LU1 of the upper groove portion 61S in the longitudinal direction L and the virtual bottom BU of the upper groove portion 61S is formed more steeply and closer to a perpendicular angle with respect to the virtual bottom BU than the angle α 2 formed by the wall surface BWU of the back-side end LU2 of the upper groove portion 61S in the longitudinal direction L and the virtual bottom BU of the upper groove portion 61S. When the upper groove portion 61S is formed in this manner, similarly to the lower groove portion 62S, even when the wearer takes a posture such as an upright position or a seat, it is possible to make it difficult for the excretion liquid such as urine leaking from the abdomen-side end LU1 in the longitudinal direction L of the upper groove portion 61S to go to the abdomen-side end edge portion 1A of the urine pad 1.

In the urine pad 1 according to the fourth embodiment, as shown in fig. 13 and 14, 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 62S and the virtual bottom BL of the lower groove 62S are formed more steeply at the vertical angles with respect to the virtual bottom BU and BL 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 61S and the virtual bottom BU of the upper groove 61S. In other words, the wall surfaces FWU, BWU, SU1, SU2 of the upper groove 61S are formed more gently with respect to the virtual bottom surfaces BL, BU of the groove 6S than the wall surfaces FWL, BWL, SL1, SL2 of the lower groove 62S. Therefore, in the urine pad 1 according to the fourth embodiment, since the wall surfaces FWU, BWU, SU1, and SU2 of the upper groove 61S are gently formed, the excretion liquid such as urine can be easily introduced into the lower groove 62S through the upper groove 61S, and the wall surfaces FWL, BWL, SL1, and SL2 of the lower groove 62S are formed steeply, so that it is possible to prevent the excretion liquid such as urine from being returned to the lower absorbent layer 62 once.

In the urine pad 1 according to the fourth embodiment, as shown in fig. 12 to 14, the distance between the one side end WU1 of the upper groove portion 61S in the width direction W and the one side end portion of the urine pad 1 in the width direction W and the distance between the other side end WU2 of the upper groove portion 61S in the width direction W and the other side end portion of the urine pad 1 in the width direction W are shorter than the distance between the abdomen side end LU1 of the upper groove portion 61S in the length direction L and the abdomen side end portion 1A of the urine pad 1 in the length direction L and the distance between the back side end LU2 of the upper groove portion 61S in the length direction L and the back side end portion 1B of the urine pad 1 in the length direction L.

Further, in the urine pad 1 according to the fourth embodiment, as shown in fig. 12 and 13, the angles α 3 and α 4 formed by the wall surfaces SU1 and SU2 of the one side end WU1 and the other side WU2 in the width direction W of the upper groove 61S and the virtual bottom BU of the upper groove 61S are formed so as to be closer to the vertical angle BU with respect to the virtual bottom BU than the angle α 1 formed by the wall surface FWU of the abdomen-side end LU1 and the virtual bottom BU of the upper groove 61S in the longitudinal direction L of the upper groove 61S and the angle α 2 formed by the wall surface BWU of the back-side end LU2 and the virtual bottom BU of the upper groove 61S in the longitudinal direction L of the upper groove 61S, and the angles BU are formed steeply. Since the urine pad 1 according to the fourth embodiment includes the upper groove portion 61S and the upper groove portion 61S has such a specific structure, the excretory fluid such as urine discharged from the wearer can easily reach the lower absorbent layer 62 through the upper groove portion 61S, and even in a case where the excretory fluid temporarily accumulates in the upper groove portion 61S, the excretory fluid can be preferentially diffused in the longitudinal direction L. Thus, in the urine pad 1 according to the fourth embodiment, in addition to efficiently absorbing excretory fluid such as urine over a wide range of the longitudinal direction L of the absorbent body 6, by interposing the upper absorbent layer 61, it is possible to prevent the occurrence of a return of the excretory fluid absorbed by the lower absorbent layer 62, so that it is difficult for the excretory fluid such as urine and its moisture to contact the skin of the wearer, and it is further possible to prevent the wearer from feeling a wet state, a damp and hot state, or a wet state.

The angles α 1 to α 4, β 1 to β 4 formed by the wall surfaces of the groove and the virtual bottom surfaces can be measured by the following measurement method.

First, a 20 × 40mm measurement sample was cut from the absorbent article to be measured with the groove portion as the center. Then, the measurement sample was rotated 0.2 degrees each time by using a fluoroscopy apparatus FLEX-M863 manufactured by Beam Sense (Ltd.), 360-degree scanning was performed, and images of each angle were taken. Thereafter, 1800 photographed images were connected 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 thus prepared, and angles α 1 to α 4 and β 1 to β 4 are measured from these cross-sectional views, respectively.

The present invention can be applied to various absorbent articles such as (light) incontinence pads and disposable diapers, in addition to the urine pads of the above embodiments. The absorbent article of the present invention is not limited to the above-described embodiments and modifications thereof, and may be appropriately combined, substituted, or modified without departing from the object and spirit of the present invention. In the present specification, the numbers such as "first" and "second" are given for the purpose of distinguishing the items to which the numbers are given, and do not indicate the order, priority, importance, and the like of the items.

Examples

The present invention will be described more specifically by way of examples and comparative examples, but the present invention is not limited to these examples.

Example 1

(1) Manufacture of low friction parts

A masterbatch comprising 50 mass% of High Density Polyethylene (HDPE) and 50 mass% of low density polyethylene, an antioxidant and a slip aid were fed into an extruder, and melt-kneaded in the extruder, and the melt-kneaded product in the extruder was extruded into a sheet shape through a T-die to obtain a sheet-shaped molded product. Further, immediately after the sheet-like molded product is extruded, the sheet-like molded product is supplied along the surface of the suction drum covered with the web, and by the suction force of the suction drum which performs suction while rotating, a plurality of openings along the opening pattern of the web are formed in the sheet-like molded product in a semi-molten state, and a rib protruding from the opening peripheral edge of the openings is formed. Then, the sheet-like molded product in a semi-molten state was cooled and solidified by suction by a suction drum and a cooling roller in the subsequent step, thereby obtaining a polyethylene sheet (low friction member) having a plurality of openings having specific ribs shown in table 1 below.

(2) Absorbent article manufacturing

The resulting polyethylene sheet (low friction member) was coated with a hot-melt adhesive on the side where the ribs protruded out of both surfaces (i.e., the side on the side not facing the skin when disposed on the absorbent article), and the low friction member was joined to the surface on the side facing the skin of the top sheet in an absorbent article precursor having a top sheet (weight per unit area of 25 g/m)²Hydrophilic hot-air nonwoven fabric) and an intermediate sheet (weight per unit area of 15 g/m)²Tissue), absorbent body (made of a material having a basis weight of 300g/m²Pulp and a basis weight of 110g/m²And having a weight per unit area of 215g/m²Pulp and a basis weight of 80g/m²A laminated absorbent body comprising a lower absorbent layer of a super absorbent polymer) and a back sheet (having a weight per unit area of 22g/m²The liquid-impermeable film of (b) to obtain the absorbent article of example 1.

In the present embodiment, the absorbent article is not provided with a cover sheet in order to evaluate the liquid return characteristics and the like of the portion where the low friction member is provided, as will be described later.

Examples 2 and 3

Absorbent articles of examples 2 and 3 were obtained in the same manner as in example 1, except that the low-friction member was changed to the configuration shown in table 1 below.

Comparative example 1

An absorbent article of comparative example 1 was obtained in the same manner as in example 1, except that a nylon sheet having no rib at the opening was used as the low friction member.

Comparative example 2

An absorbent article of comparative example 2 was obtained in the same manner as in example 1, except that the low friction member was disposed such that the ribs protruded toward the skin-facing surface side.

In order to evaluate the friction characteristics and the liquid return characteristics of the portions where the low friction members were disposed in the obtained absorbent articles of examples 1 to 3 and comparative examples 1 to 2, the friction coefficients on the surface on the skin-facing surface side of the low friction members were measured in accordance with the following < method of measuring static friction coefficient and dynamic friction coefficient, and the liquid return amounts of the portions where the low friction members were disposed were measured in accordance with the following < method of measuring liquid return amounts >. The composition of the low friction member, the friction coefficients, and the measurement results of the amount of return liquid are shown in table 1 below.

< method for measuring coefficient of static friction and coefficient of dynamic friction >

(1) Separately, a cover sheet for an absorbent article was prepared, and a weight having a bottom surface of 50mm × 50mm and 1kg of an adhesive was placed on the cover sheet, and the cover sheet and the weight were bonded together.

(2) A low friction member for manufacturing an absorbent article to be measured is placed on a horizontal surface such that the surface on the skin-facing surface side is an upper surface.

(3) The cover sheet to which the above-described 1kg weight was bonded was placed on the upper surface of the low-friction member placed on the horizontal surface so that the weight was positioned above.

(4) The weight was pulled at a speed of 100 mm/min in a direction parallel to the horizontal plane and corresponding to the longitudinal direction of the absorbent article using an arbitrary friction tester, and the friction coefficients at the time of starting the movement of the weight and after the start of the movement were measured and used as the static friction coefficient and the dynamic friction coefficient.

< method for measuring amount of liquid returned >

(1) A cylinder (inner diameter: 60mm, weight: 550g) was placed at the position (i.e., the center of the low friction member in a plan view) where artificial urine was dropped from an absorbent article (hereinafter referred to as "measurement sample") to be measured, and 150ml of artificial urine was dropped from a burette at a rate of 150ml/15sec from a position 10mm above the measurement sample at the substantially center of the cylinder. 150ml of the artificial urine was dropped twice every 5 minutes, and a total of 300ml of the artificial urine was dropped onto the measurement specimen.

The artificial urine used for this measurement was prepared by dissolving 200g of urea, 80g of sodium chloride, 8g of magnesium sulfate, 3g of calcium chloride, and about 1g of a dye (cyan No. 1) in 10L of ion-exchanged water.

(2) After 5 minutes had elapsed since 300ml of artificial urine in total was put in, 70g of filter paper (100 mm. times.100 mm) was placed at the point where the artificial urine was dropped, and 3.5kg of a weight having a bottom surface of 100 mm. times.100 mm was placed thereon, so that the artificial urine having oozed from the measurement sample was absorbed by the filter paper.

(3) After standing for 3 minutes, the weight of the filter paper having absorbed the artificial urine was measured. Then, the weight (g) of the artificial urine absorbed by the filter paper is calculated by subtracting the weight of the filter paper before the artificial urine is absorbed from the weight of the filter paper having absorbed the artificial urine, and this is used as the return liquid amount (g).

[ Table 1]

As shown in table 1, it was found that the absorbent articles of examples 1 to 3, which were provided with the low friction member having the rib portions protruding toward the non-skin-facing surface side, had a low friction coefficient of the skin-facing surface of the low friction member, and were able to reduce the amount of liquid returned while maintaining the low friction property of the low friction member (i.e., the state in which the frictional resistance between the cover sheet and the low friction member was small). On the other hand, the absorbent article of comparative example 1 including the low friction member without the rib portion was a result of a large amount of liquid returned, although the friction coefficient of the skin-facing surface of the low friction member was low. The absorbent article of comparative example 2, which was provided with the low-friction member having the ribs protruding toward the skin-facing surface side, was significantly high in the friction coefficient of the skin-facing surface of the low-friction member and had a large amount of fluid returning.

Description of the symbols

1: a diaper (absorbent article); 2: an abdominal region; 3: a crotch region; 4: a back region; 5: a surface sheet; 6: an absorbent body; 7: a back sheet; 8: a side sheet; 9: the other side piece; 10: a leakproof sheet; 11: an elastic member; 12: a leakage preventing wall portion; 13: a cover sheet; 14: a low friction member; 15: a joint portion; 16: an opening part; 17: an opening peripheral edge portion; 18: a rib portion; 19: a relief structure; 20: an absorbent sheet.

Claims

1. An absorbent article having a top sheet and an absorbent body positioned on a non-skin-facing surface side of the top sheet, and having a longitudinal direction, a width direction, and a thickness direction, wherein,

2. The absorbent article of claim 1,

the height (h) of the rib_r) And thickness (t)_r) The product of (A) is 2.0X 10^-3mm²～5.0×10^-3mm²Within the range of (1).

3. The absorbent article of claim 1 or 2,

the skin-facing surface of the peripheral edge of the opening is curved toward the non-skin-facing surface.

4. The absorbent article according to any one of claims 1 to 3,

the rigidity of the tip portion of the rib portion on the non-skin-facing surface side is higher than the rigidity of the opening peripheral edge portion.

5. The absorbent article according to any one of claims 1 to 4,

the tip end portions of the rib portions, which are located on the non-skin-facing surface side, are located inside the front sheet.

6. The absorbent article according to any one of claims 1 to 5,

the topsheet has an uneven structure in which ridges projecting toward the skin-facing surface side in the thickness direction of the absorbent article and continuously extending in the first direction, and grooves recessed toward the non-skin-facing surface side in the thickness direction and continuously extending in the first direction are alternately arranged in a second direction orthogonal to the predetermined first direction.

7. The absorbent article of claim 6,

the tip end portion of the rib portion on the non-skin-facing surface side overlaps the raised strip portion in the thickness direction.

8. The absorbent article of claim 6,

the tip end portion of the rib portion on the non-skin facing surface side overlaps the groove portion in the thickness direction.

9. The absorbent article according to any one of claims 1 to 8,

the absorbent article further includes an absorbent sheet containing a super absorbent polymer between the topsheet and the absorbent body, and the absorbent sheet overlaps the low friction member in the thickness direction.

10. The absorbent article according to any one of claims 1 to 9,

the absorbent body comprises an upper absorbent layer positioned on the skin-facing surface side and a lower absorbent layer positioned on the non-skin-facing surface side,

the upper absorbent layer has an upper groove portion extending in the longitudinal direction in the crotch region and penetrating the upper absorbent layer in the thickness direction,

in the upper groove, an angle formed by each wall surface of one end portion and the other end portion in the width direction and an imaginary bottom surface of the upper groove is closer to a vertical angle than an angle formed by each wall surface of the abdomen side end portion and the back side end portion in the longitudinal direction and the imaginary bottom surface of the upper groove.

11. The absorbent article according to any one of claims 1 to 10,

the low friction member is formed of a resin sheet-like member containing high-density polyethylene at a ratio of 50 mass% or more.

12. The absorbent article of claim 11,

the resin sheet-like member contains the high-density polyethylene and the low-density polyethylene at a mass ratio in a range of 50/50 to 75/25.

13. The absorbent article according to any one of claims 1 to 12,

the surface sheet and the low friction member are at least partially bonded together by a low tack adhesive having a measurement value of 0.78N or less in a probe tack test.

14. The absorbent article according to any one of claims 1 to 13,

the low friction member is formed of a sheet-like member having both ends in the width direction displaced toward the skin-facing surface.

15. The absorbent article according to any one of claims 1 to 14,

the absorbent article has at least one fold line extending in the width direction for folding the absorbent article in an unfolded state in the longitudinal direction, and the low-friction member is disposed at a position not overlapping the fold line in a plan view.