JP2019025148A - Absorbent article - Google Patents

Abstract

To provide an absorbent article which hardly generates discomfort felt by a wearer, and hardly causes dermatosis such as rash or bed sore.SOLUTION: An absorbent article comprises: a surface sheet (5); and an absorber (6), and comprises a longitudinal direction, a width direction and a thickness direction. The absorbent article comprises on at least a back part area (4): a low friction member (14) having plural opening parts (16) positioned on a skin facing surface side of the surface sheet (5) and penetrating in a thickness direction; and a cover sheet (13) positioned on a skin facing surface side of the low friction member (14). Each of the plural opening parts (16) has: an opening peripheral edge part (17) positioned on the skin facing surface side; and a rib part (18) protruded to a non-skin facing surface side from the opening peripheral edge part (17).SELECTED DRAWING: Figure 1

Description

  The present invention relates to an absorbent article such as a urine absorbing pad and a disposable diaper, and more particularly to an absorbent article that is unlikely to cause skin diseases such as pressure sores and rashes on the skin of a wearer.

  In recent years, various measures for improving skin diseases such as pressure ulcers and rashes (dermatitis) occurring on a wearer's skin have been studied for absorbent articles such as urine absorbing pads and disposable diapers.

  As such an absorbent article, for example, Patent Document 1 discloses an outer sheet, an absorber provided on the body side of the outer sheet, an inner sheet provided on the body side of the absorber, and provided on the left side of the pad. Left side sheet, right side sheet provided on the right side of the pad, overlap sheet provided in the buttock region, and a low friction member having an opening provided between the overlap sheet and the inner sheet A disposable urine collection pad with pressure ulcer prevention function is disclosed in which the right side edge and the left side edge of the overlap sheet are joined to the left side part of the right side sheet and the right side part of the left side sheet, respectively. The disposable urine collection pad disclosed in Patent Document 1 can be manufactured at a low cost, and the overlap sheet is easy to move in the front-rear direction relative to the inner surface sheet, thereby preventing the occurrence or deterioration of pressure ulcers. It is supposed to have a function.

JP 2014-155609 A

However, as in the absorbent article disclosed in Patent Literature 1, when a liquid-impermeable low friction member is provided on the body side (skin facing surface side) of the inner surface sheet (surface sheet), the surface sheet When the excretion fluid such as urine absorbed by the absorber located on the non-skin facing surface side is released from the absorber as moisture by evaporation or the like, the liquid impervious low friction member (more specifically, The portion covered with the low-friction member other than the opening) hinders the discharge of the moisture, so that the moisture permeates to perceive a wet state or a damp state to the wearer. There was a risk of causing discomfort. Further, when an opening is formed in the low friction member, when the excretion fluid such as urine absorbed by the absorbent returns to the skin facing surface side, the excretion fluid is opened in the low friction member. Therefore, there is a possibility that the wearer's skin is wetted with excretion liquid, causing discomfort to the wearer.
In addition, if the wearer's skin (skin) is kept wet by excreted liquid such as urine or its moisture, the wearer's skin will be swollen, making it difficult to maintain resistance to chemical or physical irritation. (That is, the protective function against various skin irritation is reduced), and the skin in such a soft state is changed to alkaline by the ammonia component derived from urine or other excreted liquid (that is, chemical irritation) If the skin is not able to withstand these irritation, it may cause skin diseases such as pressure sores and rash (dermatitis). It was. Such a skin disease is likely to occur particularly near the wearer's buttocks (specifically, near the sacrum) because the wearer often sleeps on the back.

  Therefore, an object of the present invention is to provide an absorbent article that is less likely to cause discomfort to the wearer and that is less likely to cause skin diseases such as pressure sores and rashes.

One aspect (aspect 1) of the present invention is an absorbent article having a longitudinal direction, a width direction, and a thickness direction, comprising a top sheet and an absorbent body located on the non-skin facing surface side of the top sheet. And
The absorbent article has an abdominal region, a back region, and a crotch region located between both regions in the longitudinal direction in plan view,
The absorbent article includes a low friction member having a plurality of openings located on the skin facing surface side of the topsheet and penetrating in the thickness direction at least in the back region, and a skin facing surface of the low friction member A cover sheet positioned on the side,
Each of the plurality of openings is the absorbent article having an opening peripheral portion located on the skin facing surface side and a rib portion protruding from the opening peripheral portion toward the non-skin facing surface side.

In the back region corresponding to the buttocks of the wearer who is prone to skin diseases such as pressure ulcers and rashes, the absorbent article of the present aspect 1 includes a low friction member positioned on the skin facing surface side of the top sheet, and the skin of the wearer ( Specifically, a cover sheet that is in direct contact with the skin of the buttocks) is provided, and since the friction resistance between the cover sheet and the surface sheet is low due to the intervention of a low friction member, the above cover sheet It is easy to move in the surface direction relative to the sheet. Thereby, since the above-mentioned cover sheet can move to a surface direction with a wearer's skin according to a wearer's skin, even if a wearer moves during wearing, the absorbent article of this mode 1 can move. It is difficult to give physical irritation to the wearer's skin due to friction and displacement.
And in the absorptive article of this mode 1, since the above-mentioned low friction member has a rib part projected toward the non-skin opposing surface side from an opening peripheral part in each of a plurality of openings, the concerned The rib portion functions as a spacer between the low friction member and the top sheet, and a space portion as an air passage that can discharge moisture from excreted liquid such as urine is provided between the low friction member and the top sheet. Can be formed. Thereby, since the absorbent article of this aspect 1 does not touch the wearer's skin because excretion liquid such as urine and its moisture that have returned to the skin facing surface side, it is perceived that the wearer is wet or damp. Or the wearer's skin (skin) is kept in a wet state (that is, the wearer's skin becomes inflamed) is less likely to occur.
From the above, the absorbent article of the present aspect 1 is less likely to cause discomfort to the wearer and is less likely to cause skin diseases such as pressure sores and rashes.

  In the present specification, the “excretion fluid” to be absorbed by the absorbent article is not particularly limited as long as it can be absorbed and held in the absorber described later, and for example, liquid such as urine, sweat, blood, etc. In addition to products, low-viscosity products such as loose stool are also included.

Moreover, in another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the rib part has a product of a height (h _r ) and a thickness (t _r ) of the rib part of 2.0. it is in the range of ^{× 10 -3 mm 2 ~5.0 × 10} -3 mm 2.

The absorbent article of the present embodiment 2, the rib portion, the height of the rib section _{(h r)} and thickness product of _{(t r)} is ^{2.0 × 10 -3 mm 2 ~5.0 ×} 10 -3 because it has a specific structure as a range of mm ^2, even if in the thickness direction of the absorbent article, such as the force of the wearer's body pressure or the like is applied, hardly collapse in the thickness direction rib, The function as a spacer between the low friction member and the top sheet is more stable while maintaining the low friction property of the low friction member (that is, the state in which the frictional resistance between the cover sheet and the low friction member is low). Can be demonstrated.
As a result, the absorbent article of the present aspect 2 is less likely to give physical irritation to the wearer's skin due to friction or shear force, and excreted liquid such as urine that has returned to liquid or its moisture is further applied to the wearer's skin. Since it is difficult to touch, it is possible to more stably exhibit the operational effect that the above-mentioned wearer is less likely to cause discomfort and skin diseases such as pressure sores and rashes are less likely to occur.

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

In the absorbent article according to the third aspect, in the opening portion of the above-described low friction member, the skin facing surface of the opening peripheral portion is curved toward the non-skin facing surface side. As a result, even if the rib portion described above is crushed in the thickness direction, the curved peripheral edge of the opening acts like a leaf spring so that the rib portion can be easily restored. The above-mentioned space part can be formed more reliably and more continuously.
Furthermore, since the skin facing surface of the peripheral edge portion of the opening is curved toward the non-skin facing surface side, the peripheral edge portion of the opening is not easily caught on the cover sheet (particularly, the cover sheet that moves in the surface direction), and the cover The frictional resistance between the sheet and the low friction member can be further reduced.
Therefore, the absorbent article of this aspect 3 can exhibit the effect of the absorbent article of the said aspect 1 or 2 more reliably and more stably.

  In still another aspect (Aspect 4) of the present invention, in the absorbent article according to any one of Aspects 1 to 3, the rib part has a rigidity of a tip part located on the non-skin facing surface side of the opening peripheral part. Higher than stiffness.

  In the absorbent article according to the fourth aspect, in the opening portion of the above-described low friction member, the rigidity of the tip portion of the rib portion is higher than the rigidity of the opening peripheral portion, and the rib portion is not easily deformed. Even when a force is applied in the vertical direction or the surface direction, the above-described space portion can be more reliably formed between the low friction member and the top sheet.

  In still another aspect (Aspect 5) of the present invention, in the absorbent article according to any one of Aspects 1 to 4, the rib part has a tip part located on the non-skin facing surface side located in the inside of the top sheet. doing.

  The absorbent article of this aspect 5 has a configuration in which the tip of the rib portion is positioned inside the surface sheet in the opening of the low friction member (that is, a configuration in which the tip of the rib portion enters the inside of the surface sheet). Since it is provided, it is difficult for the rib portion to move or deform due to the anchor effect of such a configuration, and the above-mentioned space portion can be formed more stably and reliably.

  In still another aspect (Aspect 6) of the present invention, in the absorbent article according to any one of the above aspects 1 to 5, the top sheet protrudes toward the skin facing surface side in the thickness direction of the absorbent article; A ridge portion that continuously extends in a predetermined first direction and a groove portion that is recessed toward the non-skin facing surface side in the thickness direction and extends continuously in the first direction are orthogonal to the first direction. The concavo-convex structure is alternately arranged along the second direction.

In the absorbent article according to the sixth aspect, since the topsheet has a specific uneven structure having the above-mentioned convex portion and the above-mentioned concave groove portion, in addition to the rib portion of the above-mentioned low friction member, the convex portion of the topsheet. The portion can also function as a spacer between the low friction member and the top sheet, and the above-described space portion can be more reliably ensured.
Further, in the absorbent article according to the sixth aspect, since the surface sheet has the concave groove portion, the low friction member and the surface sheet can be further separated from each other (that is, the thickness direction of the space portion described above). Therefore, it is difficult for the excretion fluid such as urine absorbed by the absorbent body and its moisture to reach the skin facing surface side of the low friction member (that is, to the wearer's skin). It is more difficult to touch), causing the wearer to perceive a wet state or a damp state, or causing the wearer's skin to become wet.

  In still another aspect (Aspect 7) of the present invention, in the absorbent article according to Aspect 6, the rib portion has a tip portion located on the non-skin-facing surface side overlapping the ridge portion in the thickness direction. ing.

  In the absorbent article according to the seventh aspect, the tip portion of the rib portion of the low friction member is overlapped with the convex portion of the top sheet in the thickness direction, and the above low friction member and the top sheet are further separated from each other. Therefore, excretion fluid such as urine absorbed by the absorbent body and its moisture are more difficult to reach the skin facing surface side of the low friction member. Thereby, the absorbent article of this aspect 7 can exhibit the effect of the absorbent article of the said aspect 6 more effectively and more reliably.

  In still another aspect (Aspect 8) of the present invention, in the absorbent article according to Aspect 6, the rib portion has a tip portion located on the non-skin facing surface side overlapping the concave groove portion in the thickness direction. Yes.

  In the absorbent article according to the present aspect 8, the tip portion of the rib portion of the low friction member overlaps with the groove portion of the surface sheet in the thickness direction, and the movement of the rib portion in the surface direction is performed in the groove portion of the surface sheet. Therefore, the above-mentioned space portion formed between the low friction member and the top sheet can be secured more stably and more reliably.

  In still another aspect (Aspect 9) of the present invention, in the absorbent article according to any one of Aspects 1 to 8, the absorbent article includes a superabsorbent polymer between the top sheet and the absorber. An absorbent sheet is further included, and the absorbent sheet overlaps the low friction member in the thickness direction.

The absorbent article according to the ninth aspect further includes an absorbent sheet containing a superabsorbent polymer at a position overlapping the above-described low friction member and the thickness direction between the top sheet and the absorbent body, Since the absorbent sheet (more specifically, the superabsorbent polymer contained in the absorbent sheet) swells when it absorbs excretory fluids such as urine, the surface sheet is brought to the skin facing surface side by swelling of the absorbent sheet. By pushing up, it is easy to form a state in which the tip of the rib portion of the low friction member enters the inside of the topsheet. As a result, the absorbent article of the present aspect 9 is less likely to move or deform the rib portion of the low friction member even after absorbing the excretory fluid such as urine, so that the above-described space portion can be more stably formed. And it can form more reliably.
Furthermore, the absorbent article of this aspect 9 can also exhibit more excellent absorption performance by including the above-described absorbent sheet.

  In still another aspect (Aspect 10) of the present invention, in the absorbent article according to any one of Aspects 1 to 9, the absorber is provided on the upper absorbent layer located on the skin facing surface side and on the non-skin facing surface side. A lower absorbent layer, and the upper absorbent layer has an upper groove extending in the longitudinal direction in the crotch region and penetrating through the upper absorbent layer in the thickness direction, The upper layer groove portion has an angle formed by each wall surface of the one side end portion and the other side end portion in the width direction and a virtual bottom surface of the upper layer groove portion, and each wall surface of the abdomen side end portion and the back side end portion in the longitudinal direction. And the angle formed by the virtual bottom surface of the upper layer groove is closer to the vertical.

  In the absorbent article according to the tenth aspect, the absorbent body includes an upper absorbent layer and a lower absorbent layer, and the upper absorbent layer further includes an upper groove portion having the above-described specific structure in the crotch region. Therefore, excretion fluid such as urine discharged from the wearer can easily reach the lower absorption layer via the upper groove portion, and the excretion fluid can be excreted even when the excretion fluid temporarily accumulates in the upper groove portion. The liquid can be preferentially diffused in the longitudinal direction. Thereby, the absorbent article according to the tenth aspect can efficiently absorb the excretory fluid such as urine in a wide area of the absorber, and absorbs the liquid return of the excreted fluid absorbed in the lower absorbent layer on the upper side. Since it can be made difficult to occur due to the interposition of layers, the excretion fluid such as urine and its moisture are hard to touch the wearer's skin, and the wearer's skin is perceived as wet or damp. It can be made even more difficult to get wet.

  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 a resin sheet-like member containing high-density polyethylene in a proportion of 50% by mass or more. Is formed by.

  In the absorbent article of the present aspect 11, since the low friction member is formed of a resin sheet-like member containing 50% by mass or more of high density polyethylene, the low friction member has a certain hardness or more. And it becomes a member with small frictional resistance, and the low friction property of a low friction member can be widely ensured, making the said rib part formed in the said low friction member hard to crush more in the thickness direction. Thereby, the absorptive article of this mode 11 can exhibit more stably the function as a spacer between the low friction member in the above-mentioned rib part, and a surface sheet, and, as a result, on a wearer's skin. On the other hand, it is difficult to give physical irritation due to friction or displacement force, and excretion fluid such as urine that has returned to the liquid and its humidity are more difficult to touch the wearer's skin.

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

  In the absorbent article of the present aspect 12, since the resin sheet-like member forming the low friction member contains high-density polyethylene and low-density polyethylene in a mass ratio within the range of 50/50 to 75/25, When the sheet-like member is formed or when the opening is formed in the sheet-like member, the stress remaining in the sheet-like member (that is, internal residual stress) can be reduced by the soft low-density polyethylene component. The sheet-like member (particularly, the end portion in the width direction of the sheet-like member) can be suppressed from being curled (that is, curled) due to relaxation of internal residual stress. Thereby, since the above-mentioned cover sheet can move on the low friction member more smoothly, it can make it harder to give physical irritation by friction and shift power to a wearer's skin.

  In still 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 have a measured value of a probe tack test of 0.78 N or less. It is at least partially joined via a low tack adhesive.

  In the absorbent article of this aspect 13, the top sheet and the low friction member are joined at least partially via a low tack adhesive with a probe tack test measurement of 0.78 N or less. The low friction member can be fixed to the top sheet while preventing the low tack adhesive from joining to the cover sheet located on the skin facing surface side through the opening of the low friction member. Thereby, the absorptive article of this mode 13 can move a cover sheet more stably, suppressing a position gap, exfoliation, etc. of a low friction member.

  In still 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 has both end portions in the width direction toward the skin facing surface. It is formed by the displaced sheet-like member.

  The absorbent article according to the fourteenth aspect is displaced toward the skin facing surface side because 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. By the end portion pressing the cover sheet against the wearer's skin, the cover sheet can follow the movement of the wearer's skin with higher accuracy.

  In still another aspect (Aspect 15) of the present invention, in the absorbent article according to any one of Aspects 1 to 14, the absorbent article has the width for folding the absorbent article in a developed state in the longitudinal direction. At least one fold line extending in the direction is provided, and the low friction member is disposed at a position that does not overlap the fold line in plan view.

  Since the absorbent article of the present aspect 15 is disposed at a position that does not overlap the folding line for folding the absorbent article in a state in which the low friction member is deployed in the longitudinal direction, the low friction member is folded in the width direction. The wrinkle is not provided, and the absorbent article can be stored in a package or the like in a compact state folded in the longitudinal direction while ensuring ease of movement of the cover sheet, particularly in the longitudinal direction.

  According to the present invention, it is possible to provide an absorbent article that is less likely to cause discomfort to the wearer and that is less likely to cause skin diseases such as pressure sores and rashes.

FIG. 1 is a plan view of the urine absorbing pad according to the first embodiment of the present invention as viewed in the thickness direction from the top sheet side in a developed state. FIG. 2 is a cross-sectional view of the urine absorbing pad according to the first embodiment of the present invention, taken along line II-II in FIG. 3 is a cross-sectional view of the urine absorbing pad according to the first embodiment of the present invention, taken along line III-III in FIG. FIG. 4 is an enlarged cross-sectional view of a main part of the urine absorbing pad shown in FIG. FIG. 5 is a perspective view of a low friction member used in the urine absorbing pad according to the first embodiment of the present invention. FIG. 6 is an enlarged cross-sectional view of a main part in a modified example of the urine absorbing pad according to the first embodiment of the present invention. FIG. 7: is the top view which looked at the thickness direction from the surface sheet side in the state which expand | deployed the urine picking pad which concerns on 2nd Embodiment of this invention. FIG. 8 is an enlarged cross-sectional view of a main part of a urine absorbing pad according to the second embodiment of the present invention. FIG. 9 is an enlarged cross-sectional view of a main part in a modified example of the urine absorbing pad according to the second embodiment of the present invention. FIG. 10: is the top view which looked at the thickness direction from the surface sheet side in the state which expand | deployed the urine picking pad which concerns on 3rd Embodiment of this invention. FIG. 11A is an enlarged cross-sectional view of a main part of a urine collecting pad according to the third embodiment of the present invention, and FIG. 11B is a diagram showing the excretion liquid of the urine collecting pad according to the third embodiment of the present invention. It is a principal part expanded sectional view which shows the state which absorbed. FIG. 12: is the top view which looked at the thickness direction from the surface sheet side in the state which expand | deployed the urine picking pad which concerns on 4th Embodiment of this invention. 13 is a partial cross-sectional view taken along line XIII-XIII of FIG. 12 in the urine collection pad according to the fourth embodiment of the present invention. FIG. 14 is a partial cross-sectional view of the urine absorbing pad according to the fourth embodiment of the present invention, taken along the line XIV-XIV in FIG.

  Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In this specification, unless otherwise specified, “an object placed on a horizontal surface in an unfolded state (for example, an absorbent article, a surface sheet, an absorber, a low friction member, etc.) “Looking in the thickness direction of the object from the side (the surface sheet side when the object is an absorbent article)” is simply referred to as “plan view”.

Various directions and the like used in this specification are as follows unless otherwise specified.
In the present specification, “longitudinal direction” refers to “a direction in which the length of a vertically long object (for example, absorbent article, absorbent body, etc.) in plan view is long”, and “width direction” refers to “in plan view” “Direction of the length of the vertically long object (short direction)”, “Thickness direction” means “perpendicular direction to the object placed on the horizontal surface in the unfolded state” The direction, the width direction, and the thickness direction are orthogonal to each other. Further, in this specification, the “surface direction” means “a direction in which a plane of a substantially sheet-like object (for example, an absorbent article, a surface sheet, an absorbent body, a low friction member, a cover sheet, etc.) in a plan view extends ( That is, the horizontal direction) ”, and the surface direction and the thickness direction are orthogonal to each other.
Further, in the present specification, “in the longitudinal direction of a vertically long object, a relatively proximal side with respect to a longitudinal central axis C _W that is located at the center of the object in the longitudinal direction and extends in the width direction”. This is called “inward side in the longitudinal direction”, and “relatively distal to the longitudinal central axis _CW in the longitudinal direction of the longitudinal object” is called “outward side in the longitudinal direction”. Likewise, "in the width direction of the elongated object, relatively proximal side with respect to the width direction central axis C _L to and located at the center in the widthwise direction extending in the longitudinal direction of the object" a "in the width direction It called inward "," in the width direction of the vertically elongated object, the relatively distal "with respect to the widthwise central axis C _L of" outer side in the width direction ".
Further, in the present specification, unless otherwise specified, in the thickness direction of the absorbent article, “relatively proximal to the skin surface of the wearer when the absorbent article is worn” "Side", and "the distal side relative to the skin surface of the wearer when the absorbent article is worn" is referred to as "the non-skin facing surface side". Here, “when wearing” means from the time when the wearer wears the absorbent article (that is, when the wearable state is formed) to the time that the state is maintained (while being worn) means.
In addition, in this specification, “surface on the skin facing surface side” and “surface on the non-skin facing surface side” of various members constituting the absorbent article (for example, a surface sheet, an absorber, a low friction member, a cover sheet, etc.) The “surface” may be simply referred to as “skin facing surface” and “non-skin facing surface”, respectively.

  FIG. 1 is a plan view of the urine absorption pad 1 (absorbent article) according to the first embodiment of the present invention as seen in the thickness direction from the surface sheet side in the unfolded state, and FIG. 2 and FIG. FIG. 3 is a cross-sectional view taken along lines II-II and III-III in FIG. 4 is an enlarged cross-sectional view of a main part of the urine collecting pad 1 shown in FIG. 2, and FIG. 5 is a perspective view of the low friction member 14 used in the urine collecting pad 1. FIG.

  As shown in FIG. 1, the urine absorbing 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 in plan view, and further, the longitudinal direction L Has an approximately hourglass shape in which the substantially central portion is constricted toward the inner side in the width direction W. In the present invention, the outer shape of the absorbent article is not limited to the outer shape of such an aspect, and if the length dimension in the longitudinal direction L is longer than the width dimension in the width direction W, Any vertically long shape (for example, a rectangle, an ellipse, a bowl, etc.) can be adopted according to various uses.

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

As shown in FIGS. 2 and 3, the urine absorbing pad ₁ includes a liquid-permeable surface sheet 5 positioned on the skin facing surface side S ₁ of the urine removing pad 1 in the thickness direction T, and the surface sheet 5. an absorber 6 of the absorbent is located in the non-skin facing side S _2, in the back region 4 located on the skin facing side S ₁ of the topsheet 5 and a plurality of openings through the thickness direction T a sheet-like low-friction member 14 having a part 16 and a cover sheet 13 which is positioned on the skin facing side S ₁ of the low-friction member 14 in the back region 4 comprises a basic structure.
Further, in this first embodiment, the urine absorbing pad 1, as shown in FIGS. 1 to 3, a pair of side positioned on the skin facing side S ₁ at both ends in the width direction W of the urine absorbing pad 1 Sheet (specifically, 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), and a urine absorption pad the backsheet 7 is located in the non-skin facing side S ₂ of 1, and a leak-barrier sheet 10 liquid-impermeable located between the absorbent body 6 and the back sheet 7, and further. In addition, as shown in FIG.1 and FIG.2, the above-mentioned pair of side sheet | seat is each edge part (namely, width | variety of the one side sheet | seat 8 on the inner side of the width direction W at the time of wearing of the urine collecting pad 1). The inner edge 8R and the inner edge 9L in the width direction of the other side seat 9 stand up by the contraction of the elastic member 11 such as rubber thread, and prevent leakage of excretory fluid such as urine. The leak-proof wall portion 12 can be formed.

Thus, the urine absorbing pad 1 according to the first embodiment, in the back region 4 corresponding to the buttock skin disease prone wearer such pressure ulcers and rash, the skin-facing side S ₁ of the topsheet 5 The low-friction member 14 that is positioned and the cover sheet 13 that is in direct contact with the wearer's skin (specifically, the skin of the buttocks) are provided, and the low friction between the cover sheet 13 and the top sheet 5 is provided. Since the frictional resistance is reduced due to the presence of the member 14, the above-described cover sheet 13 is easily moved in the surface direction relative to the topsheet 5. Thereby, even if the wearer moves during wearing, the cover sheet 13 can move in the surface direction along with the wearer's skin in accordance with the movement of the wearer. It is difficult to give physical stimulation to a person's skin by friction or displacement force.

And in this 1st Embodiment, the above-mentioned low friction member 14 has the several opening part 16 which penetrates the said thickness direction T, Furthermore, each of the said several opening part 16 is FIG. and FIG. 5, the opening edge 17 located relatively skin-facing side S _1, and the rib portion 18 which projects toward from the opening edge 17 on the non-skin facing side S _2, the Have.

Urine absorbing pad 1 according to the first embodiment, a rib portion 18 where the low friction member 14 protrudes toward the opening edge 17 on the non-skin facing side S ₂ in each of the plurality of openings 16 Therefore, as shown in FIG. 4, the rib portion 18 functions as a spacer between the low friction member 14 and the top sheet 5. it can be of a space portion S _P output as ventilation path capable of discharging the moisture from liquid waste. Accordingly, the urine removing pad 1 perceives a wet state or a damp state to the wearer because excretion liquid such as urine and the moisture that has returned to the skin facing surface side S ₁ are difficult to touch the wearer's skin. Or the wearer's skin (skin) is kept in a wet state (that is, the wearer's skin becomes inflamed) is less likely to occur.
Therefore, the urine absorption pad 1 according to the first embodiment is less likely to cause discomfort to the wearer and is less likely to cause skin diseases such as pressure sores and rashes.

  Hereinafter, various members constituting the absorbent article of the present invention will be described in more detail using the urine collecting pad 1 and the like according to the above-described embodiment.

[Low friction material]
In the urine absorbing pad 1 according to the first embodiment, the low friction member 14 is formed between the top sheet 5 and the cover sheet 13 in the back region 4 of the urine absorbing pad 1 as shown in FIGS. 1, 2, and 4. It is disposed between, and is configured by a low friction sheet member capable of reducing the frictional resistance between the cover sheet 13 disposed on the skin facing side S _1.

  The low friction member 14 has a predetermined longitudinal direction length (for example, 100 mm to 200 mm) along the longitudinal direction L of the urine collecting pad 1 and a predetermined width direction along the width direction W of the urine collecting pad 1 in plan view. It has a substantially rectangular outer shape having a length (for example, 50 mm to 150 mm). In the present invention, the outer shape (planar shape) of the low friction member is not limited to such an aspect, and any outer shape can be used as long as it can reduce the frictional resistance with the cover sheet. A shape (for example, a circle, an ellipse, a polygon, etc.) and a size can be adopted. Further, the low friction member is constituted by a plurality of sheet-like members divided in the longitudinal direction and / or the width direction even if it is constituted by one sheet-like member as in the first embodiment described above. May be. 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, but the plurality of sheet-like members are arranged in this way. And it becomes easy to ensure liquid permeability and air permeability.

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 can reduce the frictional resistance with the above-described cover sheet. For example, olefin-based resins such as polyethylene and polypropylene, and silicone resins , A resin sheet-like member made of a resin or a resin composition having a low coefficient of friction such as a fluororesin such as polytetrafluoroethylene; a general-purpose thermoplastic resin such as an olefin resin such as polyethylene or polypropylene, or a polyester resin such as polyethylene terephthalate Alternatively, at least one surface of the base sheet made of the thermoplastic resin composition (the surface located on the skin facing surface side in the absorbent article) is coated with a low friction material such as silicone resin or fluororesin. A coated sheet-like member formed as described above can be used.
In this specification, the sheet-like member and the base sheet are a sheet or film having a thin and flat structure, and a sheet provided with an arbitrary structure such as a concavo-convex structure; woven fabric, nonwoven fabric, knitted fabric And other sheet-like structures such as a laminated sheet in which these are arbitrarily combined.

When the above-mentioned resin sheet-like member is used as the low friction member, the resin sheet-like member preferably contains high-density polyethylene (HDPE) at a ratio of 50% by mass or more, and high-density polyethylene (HDPE) and More preferably, low-density polyethylene (LDPE) is contained at a mass ratio in the range of 50/50 to 75/25.
When the low friction member is formed of a resin sheet-like member containing 50% by mass or more of high-density polyethylene, the low-friction member has a certain hardness or higher due to the high-density polyethylene component and has a friction resistance. Since it becomes a small member, the low-friction property of the low-friction member can be widely secured while preventing the rib portion of the opening formed in the low-friction member from being crushed more in the thickness direction. Therefore, the absorbent article provided with such a resin sheet-like member as a low friction member can more stably exhibit the function as a spacer between the low friction member and the top sheet in the above-described rib portion. As a result, it is difficult to give physical irritation to the wearer's skin by friction or displacement force, and excretion fluid such as urine and the moisture that has returned to the wearer are more difficult to touch the wearer's skin.
Furthermore, when the resin-made sheet-like member forming the low-friction member contains high-density polyethylene and low-density polyethylene in a mass ratio within the range of 50/50 to 75/25, the sheet-like member is formed from the resin material. Since the stress remaining inside the sheet-like member when forming an opening in the sheet-like member (that is, internal residual stress) can be reduced by a soft low-density polyethylene component, the sheet-like member (particularly, It can suppress that the edge part of the said sheet-like member of the width direction) curls (namely, curls) by relaxation of internal residual stress. Therefore, the absorbent article provided with such a resin sheet-like member as a low friction member can move the above-described cover sheet more smoothly on the low friction member. It is possible to make it more difficult to give physical stimulation due to friction or displacement.

In this specification, high density polyethylene refers to polyethylene having a density of 0.942 g / cm ³ or more, and low density polyethylene refers to polyethylene having a density of 0.910 g / cm ³ or more and less than 0.930 g / cm ^3. Point to.

Moreover, when using the above-mentioned covering type sheet-like member as a low friction member, this covering type sheet-like member is provided on at least one surface of the base sheet made of the above-mentioned general-purpose thermoplastic resin or thermoplastic resin composition. a predetermined amount (e.g., an amount in the range of from about ^{0.6g / m 2 ~0.8g / m 2} ) can be obtained by coating the low friction material such as silicone resin or the like. 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 solvent-based, solventless or emulsion-based can be used. The curing mode is not particularly limited, and either a thermosetting silicone resin or an ultraviolet curable silicone resin 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. Therefore, it is preferable to use an ultraviolet curable silicone resin. In addition, the coating method in particular of a low friction material is not restrict | limited, Arbitrary coating methods, such as a spray system, a roll system, a dip system, can be employ | adopted.

  The structure of the low friction member is not particularly limited as long as it has low friction that can reduce the frictional resistance between the cover sheet and the cover sheet disposed on the skin facing surface side, and has an opening that will be described later. In addition, any structure other than the above-mentioned sheet-like member (for example, at least one elongated rod-like member, at least one strip-like member) can be employed, but a low-friction region is ensured widely. In consideration of the point where the cover sheet can be slipped, the slipperiness of the cover sheet on the surface of the low friction member (ease of movement in the surface direction), the flexibility of the absorbent article as a whole, etc. It is preferable to use a sheet-like member having a flat structure.

  Further, the sheet-like member that can be used as the low-friction member is not limited to one having an overall substantially flat structure as in the first embodiment, and the sheet-like member is, for example, the width of the absorbent article. Both ends in the direction may be warped (that is, 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 end portion displaced toward the skin facing surface side is the skin of the low friction member. By pressing the cover sheet positioned on the opposite surface side against the wearer's skin, the cover sheet can be made to follow the movement of the wearer's skin more accurately.

In the present invention, the static friction coefficient of the surface of the low-friction member (at least the surface facing the skin) can be moved in the surface direction along with the wearer's skin by the above-described cover sheet. There is no particular limitation as long as it can ensure a degree of slipperiness, for example, within a range of 0.04 to 0.80, preferably within a range of 0.10 to 0.50, and more preferably It is in the range of 0.10 to 0.40. Similarly, the coefficient of kinetic friction of the surface of the low friction member should be such that the above-described cover sheet can be slippery enough to move in the surface direction along with the wearer's skin along with the wearer's skin. If it does not restrict | limit in particular, For example, it exists in the range of 0.10-0.75, Preferably it exists in the range of 0.10-0.55, More preferably, it exists in the range of 0.10-0.45. is there.
The static friction coefficient and the dynamic friction coefficient can be measured according to JIS P8147 (b) horizontal method. In measuring the coefficient of static friction and the coefficient of dynamic friction, for example, a friction cotton cloth “Kyokin No. 3 (Kanakin No. 3)” defined in JIS L0803 can be used as a test piece for a horizontal plate, and for weights. As the test piece, a low friction member is used.

  In the present invention, even when the low friction member is arranged 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 planar view area), The low friction member may be disposed so as to include the cover sheet, but the low friction member overlaps with the cover sheet in the thickness direction from the viewpoint of ensuring good touch, liquid permeability, air permeability, etc. It is preferable to arrange it so that it is in a narrower range than the cover sheet at the position where it is placed. In that case, it is preferable that the low friction member has a plane view area of a certain level or less so that the low friction member is not exposed even when the cover sheet moves in the surface direction. The area in plan view is in the range of 10% to 80% of the area in plan view of the cover sheet, preferably in the range of 20% to 60%, and more preferably in the range of 25% to 50%.

Further, the position where the low friction member is disposed is not particularly limited as long as it is a position overlapping with the cover sheet in plan view, but is preferably approximately the center of the cover sheet.
Furthermore, the absorbent article of the present invention preferably has at least one fold line extending in the width direction for folding the absorbent article in a developed state in the longitudinal direction. It is preferable to arrange in a position that does not overlap the fold line in plan view. For example, in the above-described first embodiment, the urine collection pad 1 has a fold line extending in the width direction W for folding the urine collection pad 1 in the deployed state in the longitudinal direction L, closer to the abdomen side of the crotch region 3. the position and location of the abdomen side near the back region 4 has one by one, respectively (first folding line L ₁ and the second fold line L ₂ in FIG. _1), low-friction member 14, these fold lines (specifically, the position of the back side of the second folding line L ₂ in the back region 4) a position not overlapping are disposed. If the low friction member is arranged at a position that does not overlap with such a fold line, the low friction member is not provided with a crease extending in the width direction, and thus the above-described cover sheet is particularly easy to move in the longitudinal direction. The absorbent article can be stored in a package or the like in a compact state folded in the longitudinal direction while securing the above.

  And in the urine picking pad 1 which concerns on the above-mentioned 1st Embodiment, as shown in FIG.2, FIG4 and FIG.5, the low-friction member 14 is a plurality of low-friction members 14 penetrating in the thickness direction T. An opening 16 is provided. Each of the plurality of openings 16 has a substantially circular outer shape in plan view, and is arranged in a staggered manner on the surface of the low friction member 14. In the absorbent article of the present invention, the outer shape and arrangement of the opening of the low friction member are not particularly limited as long as the effect of the present invention is not impaired, and the opening is not circular in plan view. May have an outer shape of any shape (for example, a line symmetrical shape such as an ellipse, a quadrangle, a hexagon, etc.), and is arranged in an arbitrary arrangement form such as a plurality of rows or a lattice. Also good. Moreover, even if all the openings have the same outer shape, some of the openings have different outer shapes, even if some of the openings have different outer shapes. You may have.

Further, as shown in FIGS. 4 and 5, each of the plurality of openings 16 in the low friction member 14 is a peripheral portion of the opening 16 that opens on the skin facing surface side S ₁ of the low friction member 14. The thickness t _b of the base portion 14b other than the opening portion 16 of the low friction member 14 (Note that this base portion 14b is a portion having a substantially constant thickness in the low friction member 14, The opening peripheral edge portion 17 is defined as a portion having a smaller thickness than the thickness (a portion surrounded by a broken line of the low friction member 14 in FIG. 4). a rib portion 18 projecting toward the opposite side S _2, has a, such openings 16, in the thickness direction T, as the skin-facing side S ₁ toward the non-skin facing side S ₂ Small opening diameter (ie, opening diameter) Has a structure tapered so Kunar. Incidentally, the rib portion 18 of the above is in contact with the skin-facing side S ₁ of the surface of the surface sheet 5 at its distal end 18T.

In the urine absorbing pad 1 described above, the rib portion 18, the height of the rib portion _{(h r)} and the product of the thickness _{(t r)} is ^{2.0 × 10 -3 mm 2 ~5.0 ×} 10 - ^It has a specific structure that falls within the range of ³ mm ² .
Here, as shown in FIG. 4, the protrusion height (h _r ) of the rib portion is determined by using the skin facing surface of the base portion 14 b, which is a portion other than the opening portion of the low friction member 14, as the reference surface. part 18 refers to the distance (mm) in the vertical direction between the most non-skin on opposite side S ₂ tip 18T of the thickness of the rib (t _r), in the rib portion 18, the rib portions A portion corresponding to ½ of the protrusion height (h _r ) (that is, the distance in the vertical direction from the reference surface or the tip 18T is ½ of the protrusion height (h _r ) of the rib portion. Mean thickness) (mm).

In the present invention, the protrusion height (h _r ) of the rib portion formed at the opening of the low friction member and the thickness (t _r ) of the rib portion are not particularly limited as long as they do not impair the effects of the present invention. The protrusion height (h _r ) of the rib portion may be a protrusion height within a range of 0.05 mm to 1.2 mm, preferably within a range of 0.1 mm to 0.5 mm. The thickness (t _r ) can be a thickness in the range of 0.001 mm to 0.1 mm, preferably in the range of 0.005 mm to 0.05 mm. A specific product in which the product of the height (h _r ) and thickness (t _r ) of the rib portion is within a range of 2.0 × 10 ⁻³ mm ^{2 to} 5.0 × 10 ⁻³ mm ² like the pad 1. preferably it has a structure, further, the product of above 2.2 × ¹⁰ -3 mm ² And more preferably has a structure comprising in the range of 4.8 × ¹⁰ -3 mm ^2.
If the rib portion formed in the opening of the low friction member has the above-described specific structure, the rib portion even when a force such as the body pressure of the wearer is applied in the thickness direction of the absorbent article Is not easily crushed in the thickness direction, and maintains the low friction property of the low friction member (that is, the state in which the frictional resistance between the cover sheet and the low friction member is small) while maintaining the low friction member between the low friction member and the top sheet. The function as a spacer can be exhibited more stably. As a result, the absorbent article including the low friction member having the rib portion having such a specific structure is difficult to give physical irritation to the wearer's skin due to friction or shear force, and the liquid urine is returned to the urine. Since the excretion fluid and its moisture are more difficult to touch the wearer's skin, the above-mentioned effect is less likely to cause discomfort to the wearer and less likely to cause skin diseases such as pressure sores and rashes. Can be demonstrated.

  Note that the thickness of the low friction member (that is, the distance between the skin facing surface and the non-skin facing surface at the base portion other than the opening of the low friction member) is not particularly limited as long as the effect of the present invention is not impaired. Instead, any thickness in consideration of flexibility, strength, etc. (for example, a thickness in the range of 0.01 mm to 1.0 mm) can be employed.

  In this specification, the thickness of the low friction member, the protruding height of the rib portion, and the thickness of the rib portion are measured by using an arbitrary non-contact type measuring instrument such as a laser displacement meter, or a scanning electron microscope, etc. Can be measured by magnifying and observing the cross section. For the thickness of the low friction member, the protruding height of the rib portion, and the thickness of the rib portion, an average value of measured values at arbitrary five different points is adopted in consideration of the influence of measurement error and the like.

In the first embodiment described above, opening edge 17 of the opening 16, as shown in FIG. 4, the skin-facing surface toward the opening center of the opening 16 toward the non-skin facing side S ₂ It bends and is integrally connected to the rib portion 18 described above. Thus, the skin-facing side of the opening edge 17 is curved toward the non-skin facing side S _2, even when the force is applied in the planar direction by such movement of the wearer, the rib portion of the above 18 can more strongly resist the force in the surface direction, and even if the rib portion 18 is crushed in the thickness direction T, the curved opening peripheral edge portion 17 is like a leaf spring. the rib 18 acts for easy restoration, it is possible to continuously form more and a space S _P output above more reliably on.
Further, the cover sheet skin-facing side of the opening edge 17 that is curved toward the non-skin facing side S _2, such opening edge 17 to move cover sheet 13 described above (in particular, in the surface direction 13), and it is possible to reduce the frictional resistance between the cover sheet 13 and the low friction member 14.

In the present invention, the opening diameter (mm) of the opening of the low friction member is not particularly limited as long as the effect of the present invention is not impaired. For example, the opening diameter (d ₁ ) of the opening peripheral edge is 0.01 mm to 5 mm. 0.0 mm, and the opening diameter (d ₂ ) at the end of the rib portion is in the range of 0.005 mm to 4.5 mm.
Here, the opening diameter (d ₁ ) of the opening peripheral edge is an opening diameter with the boundary between the opening peripheral edge 17 and a portion other than the opening 16 (that is, the base portion 14b) as a reference position, as shown in FIG. Specifically, it refers to the diameter of the inscribed circle (the largest circle among the circles inscribed in the plan view figure) of the plan view figure drawn by the boundary line between the opening peripheral part 17 and the base part 14b. Similarly, the opening diameter at the tip of the rib portion refers to the diameter of the inscribed circle of the plan view drawn by the tip portion 18T of the rib portion 18 as shown in FIG. These opening diameters can be measured by magnifying and observing the surface or cross section of the opening using any magnifying observation means such as a microscope or a scanning electron microscope.

Further, in the first embodiment described above, the rib portion 18 of the opening 16 has a plurality of suction materials for forming a low friction member (for example, a resin sheet-like member or a base sheet) on the circumferential surface as will be described later. The rib portion 18 is shown in FIG. 4 because the rib portion 18 is formed at the same time as perforation (that is, formation of the peripheral edge portion of the opening) by being sucked in the thickness direction while being heated on the suction drum having holes. as a small thickness toward the non-skin facing side S ₂ in the thickness direction T, has become relatively high density. Thus, the rib 18, the rigidity of the tip 18T is located in the non-skin facing side S ₂ is higher than the rigidity of the relatively opening edge 17. Thus, when the rigidity of the tip end portion 18T of the rib portion 18 is higher than the rigidity of the opening peripheral edge portion 17, a certain strength can be ensured at the tip end portion 18T in contact with the topsheet 5, and the rib portion 18 is secured. Therefore, even when a force is applied in the thickness direction T or the surface direction as described above, the space portion _SP is more reliably formed between the low friction member 14 and the top sheet 5. can do. In the present invention, the means for increasing the rigidity of the tip portion of the rib portion is not limited to the above-described densification, and the rigidity of the tip portion of the rib portion is increased by adopting a high-strength material or a high-strength structure. May be high.

In the present invention, the means for forming the above-mentioned opening in the low friction member is not particularly limited. For example, a low friction member forming material (for example, a resin sheet-like member or a base sheet) is provided on the peripheral surface. Suction in the thickness direction while heating on a suction drum having a plurality of suction holes, and by drilling a portion corresponding to the suction hole in the material for forming a low friction member by the suction force of the suction drum, or the periphery of the opening A roll-shaped or flat plate-shaped mold member having a plurality of holes or recesses having substantially the same diameter as the opening diameter of the portion, and a diameter small enough to form the above-described rib portion (that is, the opening of the tip of the rib portion). Using an arbitrary drilling device or gear processing device provided with a roll-shaped or flat plate-shaped mold member having a plurality of drilling projections (for example, needle-like projections) having a diameter substantially the same as the diameter) Low The friction member forming material by drilling under pressure sandwiched between the mold members, it is possible to form the opening edge and the rib portion of the above simultaneously.
Note that the protrusion height (h _r ) and rib thickness (t _r ) of the rib portion described above are adjusted by adjusting the suction force and heating temperature of the suction drum or by the inner peripheral surface of the hole of the mold member. And the distance between the perforation protrusion and the outer peripheral surface of the perforation protrusion can be adjusted within a predetermined range. In addition, the above-described opening is formed, for example, by forming a plurality of through holes in the material for forming a low friction member using an arbitrary punching means, and then forming a peripheral portion of the through holes by an arbitrary molding method such as compression molding or vacuum molding. The rib portion having the specific structure may be formed by pressing to form a predetermined shape.

In the urine absorption pad 1 according to the first embodiment described above, the rib portion 18 of the opening portion 16 is in contact with the skin facing surface of the topsheet 5 at the tip portion 18T, but in the absorbent article of the present invention. However, the present invention is not limited to such an embodiment. Here, FIG. 6 is an enlarged cross-sectional view of a main part in a modified example of the urine absorbing pad 1 according to the first embodiment described above. In FIG. 6, the configuration other than the configuration different from the above-described first embodiment is basically the same as that of the above-described first embodiment, and thus the description thereof is omitted.
In the modification shown in FIG. 6, the rib portion 18 of the opening 16 has a tip portion 18 </ _b > T located on the non-skin facing surface side S < _b > ₂ positioned inside the topsheet 5. The urine absorbing pad 1 according to this modification has a configuration in which the front end portion 18T of the rib portion 18 is located inside the surface sheet 5 in the opening 16 of the low friction member 14 (that is, the front end portion 18T of the rib portion 18 is the surface And the rib portion 18 is less likely to move or deform due to the anchor effect of the configuration, and the above-described space portion _SP is more stable and more reliable. Can be formed.

  In the present invention, the low friction member is preferably joined to the surface sheet by any joining means such as a hot-melt adhesive, and in particular, the tip portion of the rib portion in the above-described opening is the surface sheet. It is preferable that it is joined. Note that the joining means may be applied continuously or intermittently in the longitudinal direction and / or the width direction of the absorbent article. It is easy to ensure, and it becomes difficult to produce the stuffiness in an absorbent article.

Moreover, it is preferable that the surface sheet and the low-friction member are at least partially joined via a low-tack adhesive with a probe tack test measurement value of 0.78 N or less. When the top sheet and the low friction member are at least partially joined via such a low tack adhesive, the low tack adhesive is connected to the skin facing surface side through the opening of the low friction member. Since the low friction member can be fixed to the top sheet while not being joined to the cover sheet positioned at the position, the cover sheet can be moved more stably while suppressing the displacement and peeling of the low friction member. Can do.
In addition, the measured value of the probe tack test can be measured using an arbitrary probe tack type test apparatus (for example, a tacking tester manufactured by Resuka Co., Ltd.).

[Cover sheet]
Next, the cover sheet used for the absorbent article of the present invention will be described. In the urine picking pad 1 according to the first embodiment described above, the cover sheet 13 has a thickness similar to that of the low friction member 14 in the back region 4 of the urine picking pad 1 as shown in FIGS. located on the skin facing side S ₁ of the low-friction member 14 to overlap in the direction T, and, arranged so that the low-friction member 14 in a plan view to encompass the whole of the so as not to expose the low friction member 14 Has been. As described above, since the cover sheet 13 can move in the surface direction along with the wearer's skin in accordance with the movement of the wearer, the cover sheet 13 gives physical irritation to the wearer's skin due to friction, displacement, or the like. Can be difficult.

  The cover sheet 13 has a predetermined longitudinal direction length along the longitudinal direction L of the urine collecting pad 1 and a predetermined width direction length along the width direction W of the urine collecting pad 1 in plan view. It has a long, substantially rectangular outer shape. In the present invention, the outer shape of the cover sheet is not limited to such an embodiment, and any outer shape (for example, a circle, an ellipse, a polygon, etc.) is applicable as long as the entire low friction member can be covered. Can be adopted.

  In the urine absorption pad 1 of the first embodiment, as shown in FIGS. 1 and 2, the cover sheet 13 has one side end portion 13 </ b> L in the width direction W on the inner side in the width direction of the one side sheet 8. The other side end portion 13R in the width direction W is joined to the inner side portion 8S near the end edge portion 8R, while the inner side near the width direction inner side end edge portion 9L of the other side sheet 9 described above. It is joined to the portion 9S. As shown in FIG. 1, the cover sheet 13 and each side sheet are joined from one end portion to the other end portion in the longitudinal direction L of the cover sheet 13 and extend in the longitudinal direction L. A junction 15 is formed. In the first embodiment, the cover sheet 13 does not extend to both ends of the urine absorbing pad 1 in the width direction W.

In this way, the cover sheet 13 is joined to the pair of side sheets that can form the leak-proof wall portion 12 and has a high degree of freedom of movement. The main body portion of the pad 1 is a portion formed by the topsheet 5, the absorbent body 6, the leak-proof sheet 10 and the backsheet 7.). It is difficult for the movement of the sheet 13 to be restricted, and rather, because the cover sheet 13 is joined to the side sheet having a large degree of freedom of movement, the cover sheet 13 is relative to the body portion of the urine collecting pad 1. Easy to move to.
Moreover, since the cover sheet 13 is joined to a pair of side sheets that can form the leak-proof wall portion 12 when worn, when the urine absorbing pad 1 is worn, the widthwise inner side ends of each of the pair of side sheets by edge stands up, together with the cover sheet 13 is lifted from the surface sheet 5 and the low-friction member 14 to the skin-facing side S _1, frictional resistance between the cover sheet 13 and the low-friction member 14 is less likely to occur, It becomes difficult to apply a force in the thickness direction T to the low friction member 14.
In the absorbent article of the present invention, the cover sheet may be directly fixed to the main body of the absorbent article as long as the movement is not restricted. That is, the cover sheet is joined to the main body (more specifically, the top sheet or the back sheet) of the absorbent article so as to bend enough to form a drape so that the movement is not limited. Also good.

The size in the width direction W of the joint portion 15 between the cover sheet 13 and each side sheet is not particularly limited as long as the joint sheet 15 can be joined with such a joining strength that the cover sheet 13 cannot be removed while the urine removing pad 1 is worn. The thickness is preferably in the range of 5 to 30 mm, more preferably in the range of 10 to 25 mm, and still more preferably in the range of 15 to 20 mm.
Moreover, the joining method in particular of a cover sheet and each side sheet | seat is not restrict | limited, Arbitrary joining methods using a hot-melt-type adhesive agent, heat sealing | fusion, etc. are employable.

  Further, in the first embodiment, the cover sheet 13 is provided only in the back region 4 of the urine collection pad 1 so as to correspond to the vicinity of the wearer's buttocks (especially near the sacrum) where skin diseases such as pressure ulcers and rashes are likely to occur. However, in the absorbent article of the present invention, the cover sheet is not limited to such an arrangement form, and the cover sheet is not limited to the back region, but also to the abdominal region and the crotch region where the above skin diseases can occur. You may arrange | position also to a one part area | region.

  Furthermore, in the first embodiment, as shown in FIG. 1, the cover sheet 13 is configured such that the back side edge 13 </ b> B of the cover sheet 13 extends to the back side edge 1 </ b> B of the urine collection pad 1. Has been placed. Although disposing the cover sheet in this manner is not an essential component in the absorbent article of the present invention, the cover sheet extends to a position as close to the back side as possible of the absorbent article. It is preferable. If the cover sheet extends to such a position, the vicinity of the buttocks of the wearer who is likely to cause a skin disease can be covered more widely, so that the above-mentioned skin disease can be made less likely to occur.

The size of the cover sheet is not particularly limited as long as it can function as a cover sheet, and the length of the cover sheet in the longitudinal direction is, for example, within a range of 25% to 100% of the length of the back region 4 in the longitudinal direction. Yes, preferably in the range of 30% to 80%, more preferably in the range of 40% to 70%. In addition, when the external shape of the cover sheet is a shape other than a rectangular shape, the length in the longitudinal direction means the maximum length in the longitudinal direction of the shape.
On the other hand, the length in the width direction of the cover sheet is, for example, in the range of 50 mm to 250 mm, preferably in the range of 80 mm to 200 mm, taking into consideration the range of sites where skin diseases are likely to occur and the ease of leakage of excretory fluid. And more preferably in the range of 100 mm to 180 mm. In addition, when the outer shape of the cover sheet is a shape other than a rectangular shape, the length in the width direction means the maximum length in the width direction of the shape.

  In the present invention, the material constituting the cover sheet is not particularly limited. For example, any sheet-like member such as a nonwoven fabric such as an air-through nonwoven fabric or a spunbond nonwoven fabric; a woven fabric; a knitted fabric; a plastic film can be employed. The sheet-like member may be either hydrophilic or hydrophobic. Since the cover sheet used in the present invention can be in direct contact with the skin of the wearer, it is preferable to use a sheet-like member excellent in touch and flexibility among the above-mentioned sheet-like members. As such a sheet-like member, nonwoven fabrics, such as an air through nonwoven fabric and a spun bond nonwoven fabric, are mentioned, for example. Moreover, the sheet-like member which comprises a cover sheet has a preferable thing from the point which makes a wearer's skin (specifically skin of a buttocks) difficult to wet, and is excellent in hydrophobicity. In addition, even when a hydrophilic material is used as the sheet-like member constituting the cover sheet, excretion fluid such as urine and its moisture can be permeated to a certain extent, so that the gap between the wearer's skin and the cover sheet There is an advantage that the excretion liquid such as urine and the moisture can be made difficult to be trapped.

The cover sheet may be formed of a sheet-like member that can expand and contract in at least one direction. When the cover sheet is formed of such a sheet-like member that can expand and contract in at least one direction, when the wearer's buttocks move, the cover sheet can easily follow the movement of the wearer's buttocks and more accurately. Since it can move with a heel part, it can make it harder to give physical irritation by friction, a slipping force, etc. to a wearer's buttock part.
Furthermore, if the direction in which the cover sheet can be expanded and contracted is parallel to the longitudinal direction of the absorbent article, the cover sheet can be used even when the wearer's buttocks are displaced forward when the bed is raised or the wheelchair is used. Since it can move accurately with the buttocks, it can be more difficult to give physical irritation due to the above-mentioned friction and displacement force, and as a result, it is more difficult to cause skin diseases such as pressure ulcers and rashes. can do.

  The sheet-like member that can expand and contract in at least one direction is not particularly limited as long as it has elasticity in at least one direction. For example, a nonwoven fabric or a woven or knitted fabric containing elastic fibers; It is possible to use a nonwoven fabric having an alternately formed surface (that is, a nonwoven fabric having a grooved structure); a nonwoven fabric that has been subjected to gear drawing; a nonwoven fabric or a woven or knitted fabric to which an elastic member is attached; it can. Among them, the nonwoven fabric having a ridge groove structure is stretchable in a direction orthogonal to the direction in which the ridge portion and the groove portion extend, and the nonwoven fabric not only has stretchability, but also has a small contact area with the wearer's skin, Since the physical irritation to the skin is small, it can be particularly preferably used as a cover sheet.

[Side sheet]
Next, a pair of side sheets used for the absorbent article of the present invention will be described. In the urine picking pad 1 according to the first embodiment described above, the pair of side sheets are arranged in the width direction W of the urine picking pad 1 on the skin facing surface side S ₁ of the top sheet 5 as shown in FIGS. The band-shaped one side sheet 8 disposed at one end of the band and the band-shaped other side sheet 9 disposed at the other end in the width direction W of the urine collecting pad 1 are configured. . As shown in FIG. 1, the one side sheet 8 and the other side sheet 9 extend from the abdomen side edge 1A in the longitudinal direction L of the urine collecting pad 1 to the back side edge 1B in plan view. 2 and located on the outer side in the width direction W, as shown in FIG. 2, the width direction outer edge 8L of the one side sheet 8 and the width direction of the other side sheet 9 The outer side edge portion 9R is joined to the one side edge portion and the other side edge portion in the width direction W of the leakproof sheet 10 to form a fixed end, while the inner side in the width direction W The width direction inner side edge portion 8R of the one side sheet 8 and the width direction inner side edge portion 9L of the other side sheet 9 are not joined to any member, and the free end is Forming.

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

  Further, in the first embodiment described above, each of the one side sheet 8 and the other side sheet 9 is, as shown in FIGS. 1 and 3, the width direction inner side edge portion 8R vicinity and the width direction inner side. In the vicinity of the side edge portion 9L, the elastic member 11 for contracting the one side sheet 8 and the other side sheet 9 in the longitudinal direction L to erect each width direction inner side edge portion is the longitudinal member. They are arranged along the direction L, respectively. In order to prevent leakage of excretory fluid such as urine in the width direction due to the contraction of the elastic member 11 so that the widthwise inner side edge portions of the one side sheet 8 and the other side sheet 9 are raised. The leak-proof wall portion 12 is formed.

  In the first embodiment, the elastic member 11 is disposed across a wide area extending from the abdominal region 2 to the back region 4 in the longitudinal direction L of the urine absorbing pad 1 as shown in FIG. However, the arrangement of the elastic members is not particularly limited. For example, the elastic member may be disposed over the entire length in the longitudinal direction of the pair of side sheets, or in the vicinity of the front edge and the rear edge in the longitudinal direction of the pair of side sheets as in the above-described embodiment. You may arrange | position in the predetermined range except for. In addition, when an elastic member is arrange | positioned like the latter, there exists an advantage that the edge part in the longitudinal direction of an absorbent article becomes difficult to warp.

  The expansion ratio at the time of attaching the elastic member to the pair of side sheets is not particularly limited as long as the above-described cover sheet is not pulled excessively and the leakage of excretory fluid is difficult to occur, and the expansion ratio is the natural length of the elastic member. For example, it is 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. In the first embodiment described above, the elastic member 11 is formed on the inner side edge portion 8R in the width direction of the one side sheet 8 and the inner side edge portion 9L in the width direction of the other side sheet 9. However, the present invention is not limited to such an arrangement mode, and two or more elastic members may be arranged on each of the pair of side sheets. In addition, as an elastic member, the rubber thread etc. which are generally used in absorbent articles, such as a urine picking pad and a disposable diaper, can be used.

  In the first embodiment described above, the pair of side sheets (that is, the one side sheet 8 and the other side sheet 9) are arranged in a direction along the longitudinal direction L of the urine collecting pad 1, as shown in FIG. Although it is comprised by the liquid impervious sheet | seat which has a long vertical strip-shaped external shape, in this invention, a pair of side sheet | seat is not limited to such an aspect, and can form a predetermined | prescribed leak-proof wall part. If it is a thing, the liquid-impermeable sheet | seat of arbitrary external shapes and sizes can be employ | adopted.

  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, flexibility, etc. For example, a hydrophobic nonwoven fabric (for example, hydrophobic or hydrophobic , Spunbond nonwoven fabric, point bond nonwoven fabric, spunbond layer / meltblown layer / spunbond layer (SMS) nonwoven fabric, etc.), synthetic resin film having liquid impermeability, and laminates thereof, etc. A liquid-impermeable sheet can be used.

  In addition, the basis weight and thickness of a strip-shaped liquid-impermeable sheet (for example, a hydrophobic nonwoven fabric) that can be used as a side sheet are not particularly limited as long as the effects of the present invention are not impaired, and liquid-impermeable and flexible. Any basis weight and thickness considering the above can be adopted.

  In addition, although it is not an indispensable constituent requirement in the absorbent article of the present invention, it is particularly preferable that the absorbent article includes such a side sheet in the width direction of the absorbent article. In addition, the leakage of excretion fluid such as urine can be more effectively suppressed, and the above-described cover sheet is joined to produce a frictional resistance between the cover sheet and the low-friction member as described above. There is an advantage that it is possible to make it difficult to apply a force in the thickness direction to the low friction member.

[Surface sheet]
Next, the surface sheet used for the absorbent article of the present invention will be described. In the urine picking pad 1 according to the first embodiment described above, the topsheet 5 is worn except for portions that overlap with the cover sheet 13 and the low friction member 14 in the thickness direction T as shown in FIGS. 's direct contact with may located on the skin (i.e., the position of the skin-facing side S ₁ of the urine absorbing pad 1) is arranged to, by a liquid permeable sheet excreted liquid discharged from the wearer may be transmitted It is configured.

As shown in FIGS. 1 to 3, the top sheet 5 has a longitudinal direction L and a width so as to cover substantially the entire absorbent body 6 disposed on the non-skin facing surface side S < _b > ₂ of the top sheet 5 in plan view. It extends in the direction W, and has a substantially rectangular outer shape that is long in the direction along the longitudinal direction L of the urine collecting pad 1. In the absorbent article of the present invention, the outer shape of the topsheet is not limited to such an embodiment, and the skin facing surface of the absorbent body disposed on the non-skin facing surface side of the topsheet is at least in the crotch region. As long as they are not exposed, those having an arbitrary outer shape and size can be adopted according to various uses.

  The liquid permeable sheet that can be used as the top sheet is not particularly limited as long as it has a predetermined liquid permeability, touch, etc., for example, using a cellulose-based fiber or a thermoplastic resin fiber subjected to a hydrophilic treatment. Arbitrary nonwoven fabrics, such as formed spunbond nonwoven fabric, air-through nonwoven fabric, and SMS nonwoven fabric, can be used.

  In the absorbent article of the present invention, the structure of the surface sheet is not particularly limited as long as it has a predetermined liquid permeability, touch, etc., and is substantially flat like the surface sheet 5 in the first embodiment described above. The surface sheet may have a predetermined structure such as the surface sheet of the second embodiment to be described later, but the effect of the present invention can be exhibited more advantageously. It is preferable to use one having a predetermined concavo-convex structure such as a top sheet of the second embodiment described later.

  The basis weight and thickness of a liquid-permeable sheet (nonwoven fabric or the like) that can be used as a top sheet are not particularly limited as long as the effects of the present invention are not impaired, and any basis weight and thickness considering liquid permeability and touch. However, it is preferable to use a relatively thick liquid-permeable sheet as the top sheet because it is difficult for the excretory liquid to return.

  Further, the surface sheet is bonded to the non-skin facing surface of the pair of side sheets described above, or is bonded to the skin facing surface or the non-skin facing surface of the absorber. It may be joined to the opposing surface. The joining method is not particularly limited, and any joining means such as a hot-melt adhesive or heat fusion can be employed.

[Absorber]
Next, the absorber used for the absorbent article of the present invention will be described. In the urine picking pad 1 according to the first embodiment described above, the absorbent body 6 has a top sheet 5 and a back sheet 7 (more specifically, in the thickness direction T of the urine picking pad 1, as shown in FIGS. It is comprised by the absorptive member which is arrange | positioned between leak-proof sheet | seats 10), and absorbs and hold | maintains the excretion fluid of the wearer who has permeate | transmitted the surface sheet 5. FIG.

  As shown in FIG. 1, the absorbent body 6 is shown in plan view from the abdominal region 2 (specifically, near the abdominal side edge 1 </ b> A in the longitudinal direction L) of the urine collection pad 1 to the back region 4 (specific The urine absorbing pad 1 extends from the vicinity of one side edge in the width direction W to the vicinity of the other side edge in the width direction W. Of the urine collecting pad 1 is formed long in the direction along the longitudinal direction L, and the substantially central portion of the longitudinal direction is narrowed toward the inner side in the width direction. It has an outer shape. In the present invention, the outer shape of the absorber (absorbent member) is not limited to such an embodiment, and any shape such as a rectangular shape or an oval shape can be used as long as it can exhibit a predetermined absorption performance. It may have an outer shape.

Further, the position in plan view where the absorbent body is disposed also includes the central portion of the absorbent article including the intersection of the width direction central axis C _L extending in the longitudinal direction _L and the length direction central axis C _W extending in the width direction W. If it is a position to do, it will not restrict | limit in particular, The absorber may be arrange | positioned biased to the one side of the longitudinal direction in an absorbent article.

  In the present invention, the absorbent member that can be used as an absorber is not particularly limited as long as it can absorb and retain excretory fluid such as urine, and any absorbent member known in the art may be employed. Can do. As an example of such an absorptive member, what covered the absorption core comprised with an absorptive material with core wrap sheets, such as tissue which has hydrophilicity, etc. are mentioned. Here, examples of the absorbent material constituting the absorbent core include hydrophilic fibers and superabsorbent polymers. More specifically, cellulose fibers such as pulverized pulp, cotton, rayon, acetate, etc .; acrylic Examples thereof include granular materials composed of a superabsorbent polymer such as sodium acid copolymer; and mixtures of these arbitrarily combined.

  In the present invention, the absorber may be constituted by an absorber having a multilayer structure in which two or more absorption layers are laminated in the thickness direction as in the embodiments described later. In this case, each absorption layer can be formed by the above-described absorbent member. The absorber having a multilayer structure will be described in detail in another embodiment of the present invention described later.

  In addition, the basis weight and thickness of the absorbent member that can be used as the absorbent body are not particularly limited as long as the effects of the present invention are not impaired, and any basis weight and thickness considering the absorbency, flexibility, and the like may be adopted. it can.

[Back sheet]
Next, the back sheet used for the absorbent article of the present invention will be described. In the urine absorbing pad 1 according to the first embodiment described above, the backsheet 7, as shown in FIGS. 1 to 3, disposed in a position of non-skin facing side S ₂ in the thickness direction T of the urine absorbing pad 1 It is possible to prevent the excretion fluid such as urine discharged from the wearer from permeating and prevent the excretion fluid from leaking to the outside (for example, the clothes of the wearer) while having a predetermined air permeability. It is comprised by the hydrophobic nonwoven fabric or liquid impervious sheet which functions.

  As shown in FIGS. 1 to 3, the back sheet 7 extends from the abdomen side edge 1 </ b> A in the longitudinal direction L of the urine collection pad 1 to the back side edge 1 </ b> B in plan view, and The urine collecting pad 1 extends from one side edge in the width direction W to the other side edge, and has a substantially hourglass-shaped outer shape similar to the outer shape of the urine collecting pad 1. ing. In the present invention, the outer shape of the back sheet is not limited to such an embodiment, and various uses can be used as long as the non-skin facing surface of the absorber disposed on the skin facing surface side of the back sheet is not exposed. Any external shape and size can be adopted according to the above.

  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. Arbitrary hydrophobic nonwoven fabrics such as an air-through nonwoven fabric and a non-woven fabric having a multilayer structure (for example, a five-layer structure) of three or more layers including each nonwoven fabric layer of bond layer / melt blown layer / spun bond layer can be used. Such a hydrophobic non-woven fabric may not have liquid impermeability when the absorbent article is provided with a leak-proof sheet between the back sheet and the absorbent body. When a leak-proof sheet is not provided between the absorbent body and the absorbent body, it is preferable to use a liquid-impervious sheet.

  In addition, the constituent fiber of the hydrophobic nonwoven fabric is not particularly limited, for example, a thermoplastic fiber such as polyolefin fiber such as polyethylene or polypropylene; polyester fiber such as polyethylene terephthalate; various composite fibers such as core-sheath composite fiber Can be used. Further, the basis weight and thickness of the hydrophobic nonwoven fabric are not particularly limited as long as the effects of the present invention are not impaired, and any basis weight and thickness considering air permeability and the like can be adopted.

  On the other hand, the liquid-impermeable sheet that can be used as the back sheet is not particularly limited as long as it has a predetermined liquid-impermeability. For example, any liquid-impermeable sheet such as a plastic film made of a thermoplastic resin such as polyethylene can be used. Can be used. As such a liquid-impermeable sheet, it is preferable to use a liquid-impermeable sheet having a certain air permeability (for example, a plastic film having a plurality of apertures).

  In the first embodiment described above, the urine absorbing pad 1 includes the liquid-impermeable leak-proof sheet 10 between the back sheet 7 and the absorbent body 6. The leak-proof sheet 10 is made of a plastic film made of a thermoplastic resin such as polyethylene, prevents permeation of excretion fluid such as urine discharged from the wearer, and prevents the excretion fluid from leaking outside. It will function. Although providing such a leak-proof sheet is not an essential component in the absorbent article of the present invention, if the absorbent article has a leak-proof sheet, leakage of excretion fluid such as urine is prevented. It can suppress more effectively.

  In the present invention, the position where the leak-proof sheet is arranged is not particularly limited as long as the function of the leak-proof sheet can be exhibited, and the leak-proof sheet is an absorbent article as in the first embodiment described above. It may be arranged from the abdominal region to the back region, or may be arranged only in a specific region such as the crotch region.

  Hereinafter, another embodiment (second embodiment) of the present invention, which is different from the first embodiment only in the structure of the topsheet, will be described with reference to the drawings. In addition, since structures other than the structure different from the above-described first embodiment are basically the same as those of the first embodiment, description thereof is omitted.

FIG. 7 is a plan view of the urine absorbing pad 1 according to the second embodiment of the present invention as viewed in the thickness direction T from the surface sheet 5 side in the unfolded state, and FIG. 8 relates to the second embodiment. 3 is an enlarged cross-sectional view of a main part of the urine collecting pad 1. As shown in FIGS. 7 and 8, in the urine absorbing pad 1 according to the second embodiment of the present invention, the surface sheet 5 protrudes toward the skin facing surface side S ₁ in the thickness direction T of the urine absorbing pad 1. and the urine absorbing pad 1 and the longitudinal direction L ridge 19A which direction to extend continuously along, the urine absorbing pad 1 thickness direction T in the non-skin facing side S ₂ to headed recess and the urine absorbing pad 1 The concave and convex groove portions 19 </ b> B continuously extending in the direction along the longitudinal direction L have the concavo-convex structures 19 arranged alternately along the width direction W of the urine collecting pad 1.

In the urine absorbing pad 1 according to the second embodiment, the topsheet 5 has a specific uneven structure 19 having the ridge portion 19A and the groove portion 19B, and therefore the rib portion 18 of the low friction member 14 described above. in addition, convex portions 19A of the topsheet 5 also can serve as a spacer between the low friction member 14 and the surface sheet 5, it is possible to more reliably secure a space portion S _P output above. Furthermore, in the urine absorbing pad 1 according to the second embodiment, since the topsheet 5 has the concave groove portion 19B, the low-friction member 14 and the topsheet 5 can be separated more greatly (that is, sectional area in the thickness direction T of the space S _P output above it is possible to ensure greater) for, absorbed liquid waste and its moisture absorbent body 6, the skin-facing surface side of the above-described low-friction member 14 difficult to reach the S _1, or to perceive the state state and the stuffiness was wet to the wearer, that such or in a state of wet skin of the wearer, can be more difficult to even occur.

  In addition, in the absorbent article of the present invention, the direction in which the protruding strip portion and the recessed groove portion of the surface sheet extend is not limited to the aspect of the second embodiment described above, and the protruding strip portion and the recessed groove portion are the width of the absorbent article. You may extend along arbitrary directions, such as a direction.

In the urine absorbing pad 1 according to the second embodiment, the low-friction member 14 described above, as shown in FIG. 8, the distal end portion 18T is urine absorbing located non-skin facing side S ₂ of the rib portion 18 It arrange | positions so that it may overlap with the protruding item | line part 19A of the surface sheet 5 in the thickness direction T of the pad 1. FIG. As described above, when the leading end portion 18T of the rib portion 18 of the low friction member 14 overlaps the convex strip portion 19A of the topsheet 5 in the thickness direction T, the low friction member 14 and the topsheet 5 described above are combined. Since it can be further separated, excretion fluid such as urine absorbed by the absorbent body 6 and its moisture are less likely to reach the skin facing surface side S ₁ of the low friction member 14 described above. Thereby, the urine-absorbing pad 1 according to the second embodiment causes the above-described effects (that is, the wearer to perceive a wet state or a damp state, or the wearer's skin becomes wet). Such an effect that it can be made more difficult to occur) can be more effectively and reliably exhibited.

In the urine absorbing pad 1 according to the second embodiment described above, the low-friction member 14, the thickness direction T of the distal end portion 18T is urine absorbing pad 1 is located in the non-skin facing side S ₂ of the rib portion 18 However, in the absorbent article of the present invention, the disposition form of the low friction member is not limited to such a form. Here, FIG. 9 is an enlarged cross-sectional view of a main part in a modification of the urine collecting pad 1 according to the second embodiment of the present invention. In FIG. 9, the configuration other than the configuration different from the above-described second embodiment is basically the same as that of the second embodiment, and thus description thereof is omitted.

In the modification shown in FIG. 9, the low friction member 14 includes a tip 18 </ _b > T located on the non-skin facing surface side S < _b > ₂ of the rib 18, as shown in FIG. 9. Are arranged so as to overlap with the concave groove portion 19B of the topsheet 5. As described above, when the front end portion 18T of the rib portion 18 of the low friction member 14 overlaps the concave groove portion 19B of the topsheet 5 in the thickness direction T, the movement in the surface direction of the rib portion 18 described above is performed. it is possible to regulate by 5 of the groove portion 19B, it is possible to secure a space portion S _P output above which is formed between the low friction member 14 and the topsheet 5, more stable and more reliable.

  In the present invention, the concavo-convex structure of the top sheet has a protruding portion protruding toward the skin facing surface side in the thickness direction of the absorbent article and continuously extending in a predetermined first direction, and in the thickness direction. If the concave-convex structure that is recessed toward the non-skin facing surface side and that extends continuously in the first direction is alternately disposed along a second direction orthogonal to the first direction, the non-skin The structure on the opposite surface side is not particularly limited, and may be formed substantially flat as in the second embodiment described above, or a groove and a protrusion corresponding to the protrusion and the groove are formed. (That is, it may be formed such that the cross-sectional structure along the second direction of the topsheet is substantially corrugated).

  The method for imparting the concavo-convex structure to the surface sheet is not particularly limited, and may be any shaping method such as a method of continuously blowing a gas (for example, air) on the fiber web, a compression molding method, a gear stretching method, or the like. Can be adopted.

  Hereinafter, still another embodiment (third embodiment) of the present invention, which is different from the first embodiment described above only in having an absorbent sheet, will be described with reference to the drawings. In addition, since structures other than the structure different from the above-described first embodiment are basically the same as those of the first embodiment, description thereof is omitted.

  FIG. 10 is a plan view of the urine absorption pad 1 according to the third embodiment of the present invention as viewed in the thickness direction T from the surface sheet 5 side in the unfolded state, and FIG. It is a principal part expanded sectional view in the urine collection pad 1 which concerns on a form, FIG.11 (b) is a principal part expanded sectional view which shows the state which the urine collection pad 1 which concerns on 3rd Embodiment absorbed the excretion liquid. The urine absorbing pad 1 according to the third embodiment of the present invention includes an absorbent sheet 20 containing a superabsorbent polymer between the top sheet 5 and the absorbent body 6 as shown in FIGS. Is further provided.

  As shown in FIG. 10, the absorbent sheet 20 has a predetermined longitudinal length (for example, 100 mm to 200 mm) extending from the crotch region 3 to the back region 4 of the urine collecting pad 1 in plan view. And having a predetermined width direction length (for example, 100 mm to 200 mm) extending so as to cover most of the absorber 6 in the width direction W, and having a substantially rectangular outer shape that is long in the longitudinal direction L. ing. In the absorbent article of the present invention, the outer shape of the absorbent sheet is not limited to such an embodiment, and any outer shape (for example, a circle, an ellipse, a polygon, etc.) according to the desired absorption performance or the like. ) Can be adopted.

And in the urine picking pad 1 which concerns on 3rd Embodiment, as shown in FIG.10 and FIG.11 (a), the absorptive sheet | seat 20 is a back area | region from the crotch area | region 3 of the urine picking pad 1 in planar view. 4 extends in the back region 4 so as to overlap with the low friction member 14 in the thickness direction T. When the absorbent sheet 20 is disposed so as to overlap with the low friction member 14 in the thickness direction T, the absorbent sheet 20 (more specifically, a superabsorbent polymer contained in the absorbent sheet 20). when There absorbing the liquid waste such as urine, to boost topsheet 5 absorbent sheet 20 swells the skin facing side S _1, as shown in FIG. 11 (b), the low-friction member 14 rib It becomes easy to form a state in which the front end portion 18T of the portion 18 enters the inside of the topsheet 5. As a result, the urine absorbing pad 1 according to the third embodiment is less likely to move or deform the rib portion 18 of the low friction member 14 even after the excretion fluid such as urine is absorbed. part S _P more stably can and be more reliably formed. In addition, the urine picking pad 1 which concerns on this 3rd Embodiment can also exhibit the further outstanding absorption performance by providing the above-mentioned absorptive sheet 20. FIG.

  In the present invention, the absorbent sheet is not particularly limited as long as it is a sheet-like member containing a superabsorbent polymer. For example, a superabsorbent polymer such as a sodium acrylate copolymer is coated with a covering sheet such as a hydrophilic tissue. Something covered. In addition, the absorptive sheet may contain the absorptive material similar to the above-mentioned absorber other than a superabsorbent polymer.

  In addition, the basis weight and thickness of the absorbent sheet are not particularly limited as long as the effects of the present invention are not impaired, and any basis weight and thickness in consideration of desired absorption performance and flexibility can be adopted.

  Next, a fourth embodiment, which is still another embodiment of the present invention, which differs from the first embodiment described above only in the configuration of the absorber, will be described with reference to the drawings. In addition, since structures other than the structure different from the above-described first embodiment are basically the same as those of the first embodiment, description thereof is omitted.

FIG. 12 is a plan view of the urine absorbing pad 1 according to the fourth embodiment of the present invention as viewed in the thickness direction T from the surface sheet 5 side in the unfolded state, and FIG. 13 relates to the fourth embodiment. FIG. 14 is a partial cross-sectional view of the urine collection pad 1 taken along line XIII-XIII in FIG. 12, and FIG. 14 is a cross-sectional view taken along the line XIV-XIV in FIG. 12 of the urine collection pad 1 according to the fourth embodiment. It is a fragmentary sectional view.
As shown in FIGS. 12 to 14, the urine absorbing pad 1 according to the fourth embodiment of the present invention includes an upper absorbent layer 61 in which the absorber 6 is positioned on the skin facing surface side S ₁ in the thickness direction T. , and a lower absorbent layer 62 located in the non-skin-facing side S _2, a. The upper absorbent layer 61 is long in the direction along the longitudinal direction L of the urine absorbing pad 1 in plan view, and has a substantially hourglass shape in which the crotch region 3 is constricted toward the inner side in the width direction. While having an outer shape, the lower absorbent layer 62 is formed long in the direction along the longitudinal direction L of the urine collecting pad 1 in plan view, and the minimum length in the width direction of the upper absorbent layer 61. It has a substantially rectangular outer shape having a length in the width direction smaller than that.

The upper absorbent layer 61 has an upper groove portion 61S that extends along the longitudinal direction L in the crotch region 3 and penetrates the upper absorbent layer 61 in the thickness direction T. As shown in FIG. 12, the upper layer groove 61S is located in the crotch region 3 of the urine absorbing pad 1 and passes through the center of the absorbent body 6 in the width direction W (that is, the width direction central axis extending in the longitudinal direction L). located on C _L) extends in the longitudinal direction L. Thus, since upper-layer groove part 61S is formed in the position corresponding to the supply position of excretion liquids, such as urine discharged | emitted from the wearer, excretion liquids, such as urine discharged | emitted from the wearer, are topsheet 5 Before diffusing the top (that is, hardly contaminating the skin facing surface of the urine collecting pad 1), it can be quickly drawn into the lower absorbent layer 62 through the upper layer groove 61S.

Furthermore, in the present fourth embodiment, the lower absorbent layer 62 extends through the crotch region 3 along the longitudinal direction L and passes through the lower groove 62S that penetrates the lower absorbent layer 62 in the thickness direction T. Have. As shown in FIG. 12, the lower layer groove 62S is located in the crotch region 3 of the urine absorbing pad 1 and passes through the center in the width direction W of the absorbent body 6 (that is, the width direction central axis extending in the longitudinal direction L). C _L positioned on) extends longitudinally L, to overlap with the upper groove 61S in a thickness direction T (i.e., so as to overlap in plan view) is formed. For this reason, excreted fluid such as discharged urine can be quickly drawn into the lower absorption layer 62 through the upper layer groove portion 61S of the upper absorption layer 61 and the lower layer groove portion 62S of the lower absorption layer 62.
In addition, it is not an essential constituent requirement in the absorbent article of the present invention that the lower absorbent layer has a lower layer groove portion that penetrates the lower absorbent layer in the thickness direction. It does not need to have a lower layer groove part, and may be formed as a recessed part depressed in the thickness direction from the skin facing surface side of the lower absorbent layer toward the non-skin facing surface side.

  Further, in the fourth embodiment, the upper layer groove portion 61S and the lower layer groove portion 62S are formed so that their positions coincide with each other in plan view (that is, both groove portions communicate with each other in the thickness direction). ing. Therefore, the absorbent body 6 is formed with a groove 6S in which the upper layer groove 61S and the lower layer groove 62S overlap in the thickness direction T. Thereby, in this 4th Embodiment, the absorber 6 makes excretion liquid, such as the discharged | emitted urine, a lower side absorption layer through the upper layer groove part 61S of the upper side absorption layer 61, and the lower layer groove part 62S of the lower side absorption layer 62. In addition to being able to be quickly drawn into the interior of 62, it is possible to make it difficult for liquid excretion such as urine absorbed by the lower absorbent layer 62 to return due to the interposition of the upper absorbent layer 61.

  Longitudinal direction L length and width direction W length in plan view of upper layer groove portion 61S and lower layer groove portion 62S (hereinafter, the longitudinal direction length of the groove portion is simply referred to as “length”, and the width direction length of the groove portion is simply referred to as “length”. The width ") can be any size in consideration of the size of the upper absorbent layer 61 and the lower absorbent layer 62 from the viewpoint of desired absorption performance and flexibility. For example, the width of the upper layer groove 61S is usually in the range of 5.0 to 50 mm, preferably in the range of 10 to 20 mm. Similarly, the width of the lower layer groove portion 62S is equal to or narrower than the width of the upper layer groove portion 61S, and is usually in the range of 5.0 to 40 mm, and preferably in the range of 10 to 15 mm. Further, the length of the upper layer groove 61S is usually in the range of 50 to 300 mm, preferably in the range of 50 to 200 mm, and more preferably in the range of 50 to 150 mm. Similarly, the length of the lower layer groove part 62S is equal to or shorter than the length of the upper layer groove part 61S, and is usually in the range of 30 to 250 mm, preferably in the range of 30 to 150 mm. Since the width and length of the upper layer groove portion 61S are equal to or larger than the width and length of the lower layer groove portion 62S, the upper and lower absorbent layers 61 and 62 may be somewhat laminated due to the process of laminating or wearing. Even if the shift occurs, the size of the groove 6S in the plan view of the absorber 6 can be kept substantially constant. Further, a step is generated on the inner wall surface of the groove 6S, and the surface area of the groove 6S is increased. Therefore, the absorption performance of the absorbent body 6 in the portion where the groove 6S is formed can be improved.

Here, the groove 6S of the absorber 6 in the fourth embodiment will be described in more detail.
As shown in FIG. 13 and FIG. 14, the upper layer groove 61S is a pair of wall surfaces arranged in the longitudinal direction L and facing the width direction W, that is, the wall surface SU1 and the width direction of the one end portion WU1 in the width direction W. The wall surface SU2 of the other side end WU2 in W and a pair of wall surfaces arranged in the width direction W and facing the longitudinal direction L, that is, the wall surface FWU of the abdomen side end LU1 in the longitudinal direction L and the back portion in the longitudinal direction L And the lower layer groove 62S is a pair of wall surfaces arranged in the longitudinal direction L and facing the width direction W, that is, one side end portion WL1 in the width direction W. Wall surface SL1 and the wall surface SL2 of the other end WL2 in the width direction W, and a pair of wall surfaces arranged in the longitudinal direction L along the width direction W, that is, the abdomen side in the longitudinal direction L And a, and the wall BWL back end LL2 in the wall FWL and the longitudinal direction L of the section LL1. 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 surface BU of the upper layer groove 61S is a plane obtained by virtually extending the non-skin facing surface of the upper absorbent layer 61 to the upper layer groove 61S that is a through hole. Similarly, the virtual bottom surface BL of the lower layer groove 62S is a plane obtained by virtually extending the non-skin facing surface of the lower absorbent layer to the lower layer groove 62S that is a through hole. Therefore, the virtual bottom surface BU of the upper layer groove portion 61S and the virtual bottom surface BL of the lower layer groove portion 62S are in a parallel relationship with each other.

In the urine absorption pad 1 according to the fourth embodiment, as shown in FIGS. 12 and 13, the abdomen side end LL1 in the longitudinal direction L of the lower layer groove 62S and the abdomen side end edge 1A of the urine collection pad 1 Is shorter than the distance between the back-side end LL2 in the longitudinal direction L of the lower layer groove 62S and the back-side end edge 1B of the urine collecting pad 1.
Furthermore, in the urine collecting pad 1 according to the fourth embodiment, as shown in FIG. 13, the wall surface FWL of the abdomen side end LL1 in the longitudinal direction L of the lower layer groove 62S and the virtual bottom surface BL of the lower layer groove 62S are formed. The angle β1 is perpendicular to the virtual bottom surface BL and is steeper than the angle β2 formed by the wall surface BWL of the back side end LL2 and the virtual bottom surface BL of the lower layer groove 62S in the longitudinal direction L of the lower layer groove 62S. It is formed as follows. For example, when the wearer is taking a posture such as standing or sitting, when excretory fluid such as urine discharged from the wearer leaks from the abdomen side end LL1 in the longitudinal direction L of the lower layer groove 62S, The leaked excretory fluid tends to flow toward the abdomen side edge 1A of the urine collecting pad 1 through the upper layer groove 61S. However, by forming the lower layer groove 62S as described above, Excretion fluid such as urine leaking from the abdomen end LL1 in the longitudinal direction L can be made difficult to go to the abdomen end edge 1A of the urine collection pad 1.

Moreover, in the urine absorbing pad 1 according to the fourth embodiment, as shown in FIGS. 12 and 13, the abdomen side end LU1 in the longitudinal direction L of the upper layer groove 61S and the abdomen side edge of the urine removing pad 1 The distance from 1A is shorter than the distance between the back-side end LU2 and the back-side end edge 1B of the urine removing pad 1 in the longitudinal direction L of the upper layer groove 61S.
Furthermore, in the urine absorbing pad 1 according to the fourth embodiment, as shown in FIG. 13, the wall surface FWU of the abdomen side end portion LU1 in the longitudinal direction L of the upper layer groove portion 61S and the virtual bottom surface BU of the upper layer groove portion 61S are formed. The angle α1 is perpendicular to the virtual bottom surface BU and becomes steeper than the angle α2 formed by the wall surface BWU of the back-side end LU2 and the virtual bottom surface BU of the upper layer groove 61S in the longitudinal direction L of the upper layer groove 61S. It is formed as follows. When the upper layer groove 61S is formed in this manner, the abdomen side end in the longitudinal direction L of the upper layer groove 61S in the case where the wearer is in a posture such as standing or sitting like the lower layer groove 62S described above. The excretory fluid such as urine leaking from the portion LU1 can be made difficult to go to the abdomen side edge 1A of the urine collecting pad 1.

  In the urine absorption pad 1 according to the fourth embodiment, as shown in FIGS. 13 and 14, each of the wall surfaces FWL, BWL, SL1, SL2 of the lower layer groove 62S and the virtual bottom surface BL of the lower layer groove 62S, The angles β1, β2, β3, β4 formed by are the virtual bottom surfaces than the angles α1, α2, α3, α4 formed by the respective wall surfaces FWU, BWU, SU1, SU2 of the upper layer groove 61S and the virtual bottom surface BU of the upper layer groove 61S. It is formed so as to be steeper and closer to perpendicular to BU and BL. In other words, each wall surface FWU, BWU, SU1, SU2 of the upper layer groove portion 61S is formed more gently with respect to the virtual bottom surface BL, BU of the groove portion 6S than each wall surface FWL, BWL, SL1, SL2 of the lower layer groove portion 62S. ing. Therefore, in the urine absorption pad 1 according to the fourth embodiment, each wall surface FWU, BWU, SU1, SU2 of the upper layer groove 61S is gently formed, so that excretory fluid such as urine can be discharged through the upper layer groove 61S. It is easier to draw into the lower layer groove 62S, and the wall surface FWL, BWL, SL1, SL2 of the lower layer groove 62S is steeply formed, so that the return of excreted liquid such as urine once drawn into the lower absorption layer 62 occurs. Can be difficult.

Moreover, in the urine absorbing pad 1 according to the fourth embodiment, as shown in FIGS. 12 to 14, one end WU <b> 1 in the width direction W of the upper layer groove 61 </ b> S and one in the width direction W of the urine removing pad 1. The distance between the side edge portion and the distance between the other side end portion WU2 in the width direction W of the upper layer groove portion 61S and the other side end edge portion in the width direction W of the urine collecting pad 1 is the upper layer groove portion 61S. The distance between the abdomen side end portion LU1 in the longitudinal direction L and the abdomen side end edge portion 1A in the longitudinal direction L of the urine collection pad 1, and the back side end portion LU2 and the urine collection in the longitudinal direction L of the upper layer groove 61S It is shorter than the distance from the back side edge 1 </ b> B in the longitudinal direction L of the pad 1.
Furthermore, in the urine absorbing pad 1 according to the fourth embodiment, as shown in FIGS. 12 and 13, each wall surface SU1 of the one side end WU1 and the other side end WU2 in the width direction W of the upper layer groove 61S, Angles α3 and α4 formed between SU2 and the virtual bottom surface BU of the upper layer groove 61S are angles α1 formed between the wall surface FWU of the abdomen end LU1 in the longitudinal direction L of the upper layer groove 61S and the virtual bottom surface BU of the upper layer groove 61S, and The upper layer groove 61S is formed so as to be steep and nearer to the virtual bottom surface BU than each of the angles α2 formed by the wall surface BWU of the back side end portion LU2 and the virtual bottom surface BU of the upper layer groove 61S in the longitudinal direction L of the upper layer groove 61S. ing. Since the urine removing pad 1 according to the fourth embodiment includes the upper layer groove portion 61S having such a specific structure, excretion fluid such as urine discharged from the wearer passes through the upper layer groove portion 61S. While becoming easy to reach the lower absorption layer 62, the excretion liquid can be preferentially diffused in the longitudinal direction L even when the excretion liquid temporarily accumulates in the upper layer groove 61S. As a result, the urine absorbing pad 1 according to the fourth embodiment can efficiently absorb excretion fluid such as urine in a wide area in the longitudinal direction L of the absorber 6 and is absorbed by the lower absorbent layer 62. The liquid return of the excreted fluid can be made difficult to occur by the interposition of the upper absorbent layer 61, so that the excreted fluid such as urine and its moisture are difficult to touch the wearer's skin, and the wearer is wet or damp It is possible to make it even more difficult to perceive the state or to make the wearer's skin wet.

In addition, the measurement of the angles α1 to α4 and β1 to β4 formed by each wall surface of the groove and each virtual bottom surface can be obtained according to the following measurement method.
First, a 20 × 40 mm measurement sample is cut out from the absorbent article to be measured, centering on the groove. Next, using a X-ray fluoroscopy device FLEX-M863 manufactured by Beamsense Co., Ltd., the measurement sample is rotated by 0.2 degrees to perform a 360-degree scan, and an image for each angle is taken. Thereafter, the captured 1800 images are 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 created, and the angles α1 to α4 and β1 to β4 are measured from these cross-sectional views, respectively.

  The present invention can be applied to various absorbent articles such as a (light) incontinence pad and a disposable diaper in addition to the urine collection pad of each of the embodiments described above. Further, the absorbent article of the present invention is not limited to the above-described embodiments and modifications thereof, and can be appropriately combined, substituted, changed, and the like without departing from the object and spirit of the present invention. is there. In this specification, ordinal numbers such as “first” and “second” are used to distinguish items with the ordinal numbers, and mean the order, priority, importance, etc. of each item. Not what you want.

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

Example 1
(1) Manufacture of a low friction member A master batch composed of 50% by mass of high density polyethylene (HDPE) and 50% by mass of low density polyethylene, an antioxidant, and a slip agent are put into an extruder, After melt-kneading, the melt-kneaded material in the extruder was extruded into a sheet shape via a T-die to obtain a sheet-like molded product. Further, immediately after extrusion, the sheet-like molded product is supplied along the surface of the suction drum covered with the mesh, and the suction force of the suction drum sucked while rotating is turned into a semi-molten sheet-like molded product. A plurality of openings along the opening pattern of the mesh were formed, and a rib portion protruding from the opening periphery of the opening was formed. And, by cooling and solidifying this semi-molten sheet-like molded product by suction with a suction drum and a subsequent process of a peeling roll, a plurality of ribs having specific rib portions shown in Table 1 below are obtained. A polyethylene sheet (low friction member) having an opening was obtained.
(2) Production of absorbent article Of the two surfaces of the obtained polyethylene sheet (low friction member), the surface on the side where the rib portion protrudes (that is, the non-skin facing surface when placed on the absorbent article) Hot melt adhesive is applied to the surface (side surface), and the low friction member is divided into a top sheet (hydrophilic air-through nonwoven fabric having a basis weight of 25 g / m ² ) and an intermediate sheet (tissue having a basis weight of 15 g / m ² ). , superabsorbent absorber (basis weight 300 g / and an upper absorbent layer having a superabsorbent polymer in ^{m 2} pulp and basis weight 110g / ^{m 2,} a basis weight 215 g / ^{m 2} pulp and basis weight 80 g / ^{m 2} Laminated sheet comprising a lower absorbent layer having an absorbent polymer) and a back sheet (liquid impermeable film having a basis weight of 22 g / m ² ) in this order, a top sheet in an absorbent article precursor On the surface facing the skin Combined to give an absorbent article of Example 1.
In the present example, the absorbent article does not have a cover sheet for evaluating the liquid return characteristics and the like of the portion where the low friction member is arranged, 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 structure 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 portion 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 arranged so that the rib portion protruded toward the skin facing surface side.

  For the absorbent articles of Examples 1 to 3 and Comparative Examples 1 and 2 obtained, in order to evaluate the friction characteristics and liquid return characteristics of the portion where the low friction member is arranged, the following <Static friction coefficient and dynamic friction coefficient: Each friction coefficient on the skin-facing surface side surface of the low friction member was measured by the measurement method>, and the liquid return amount of the portion where the low friction member was disposed was measured by the following <liquid return amount measurement method>. The measurement results of the composition of the low friction member, each friction coefficient, and the liquid return amount are shown in Table 1 below.

<Measuring method of static friction coefficient and dynamic friction coefficient>
(1) A cover sheet used for the absorbent article is separately prepared, and a 1 kg weight having a bottom surface size of 50 mm × 50 mm and having an adhesive applied to the bottom surface is placed on the cover sheet. Glue and weight.
(2) The low friction member used for manufacturing the absorbent article to be measured is placed on a horizontal plane so that the surface on the skin facing surface side is the upper surface.
(3) The cover sheet, to which the above 1 kg weight is bonded, is placed on the upper surface of the low friction member placed on a horizontal surface so that the weight is positioned above.
(4) Using an arbitrary friction tester, 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, and the weight started to move. Each subsequent friction coefficient is measured, and these friction coefficients are defined as a static friction coefficient and a dynamic friction coefficient.

<Measurement method of liquid return amount>
(1) An artificial urine dropping position (that is, a central portion of a low friction member in a plan view) of an absorbent article (hereinafter referred to as a “measurement sample”) that is a measurement target with a cylinder (inner diameter 60 mm, weight 550 g). Then, 150 ml of artificial urine is dripped from the burette at a speed of 150 ml / 15 sec from a position 10 mm above the measurement sample at approximately the center of the cylinder. 150 ml of artificial urine is dropped twice every 5 minutes, and a total of 300 ml of artificial urine is dropped onto the measurement sample.
Artificial urine used for this measurement is prepared by dissolving 200 g of urea, 80 g of sodium chloride, 8 g of magnesium sulfate, 3 g of calcium chloride, and about 1 g of a dye (blue No. 1) in 10 L of ion-exchanged water.
(2) Five minutes after adding 300 ml of artificial urine in total, 70 g of filter paper (100 mm × 100 mm) is placed on the artificial urine dropping position, and the size of the bottom surface is 100 mm × 100 mm. Place a 5 kg weight and allow the filter paper to absorb the artificial urine that exudes from the measurement sample.
(3) After standing for 3 minutes, measure the weight of the filter paper that has absorbed artificial urine. Then, by subtracting the weight of the filter paper before absorbing the artificial urine from the weight of the filter paper that has absorbed the artificial urine, the weight (g) of the artificial urine absorbed by the filter paper is calculated, and this is calculated as the liquid return amount. (G).

  As shown in Table 1, the absorbent articles of Examples 1 to 3 provided with the low friction member having the rib portion protruding to the non-skin facing surface side have a low coefficient of friction on the skin facing surface of the low friction member and are low. It was found that the liquid return amount can be reduced while maintaining the low friction property of the friction member (that is, the state in which the frictional resistance between the cover sheet and the low friction member is small). On the other hand, the absorbent article of Comparative Example 1 provided with the low friction member having no rib part resulted in a large amount of liquid return although the friction coefficient of the skin facing surface of the low friction member was low. In addition, the absorbent article of Comparative Example 2 including the low friction member having the rib portion protruding to the skin facing surface side has a remarkably high coefficient of friction on the skin facing surface of the low friction member and a large amount of liquid return. became.

1 Urine pad (absorbent article)
2 Abdominal region 3 Crotch region 4 Back region 5 Top sheet 6 Absorber 7 Back sheet 8 One side sheet 9 The other side sheet 10 Leakproof sheet 11 Elastic member 12 Leakproof wall portion 13 Cover sheet 14 Low friction member 15 Joining Part 16 Opening part 17 Opening peripheral part 18 Rib part 19 Uneven structure 20 Absorbent sheet

Claims (15)

An absorbent article having a longitudinal direction, a width direction and a thickness direction, comprising a top sheet and an absorbent body located on the non-skin facing surface side of the top sheet,
The absorbent article has an abdominal region, a back region, and a crotch region located between both regions in the longitudinal direction in plan view,
The absorbent article includes a low friction member having a plurality of openings located on the skin facing surface side of the topsheet and penetrating in the thickness direction at least in the back region, and a skin facing surface of the low friction member A cover sheet positioned on the side,
Each of the plurality of openings includes the opening peripheral portion located on the skin facing surface side, and a rib portion protruding from the opening peripheral portion toward the non-skin facing surface side. The rib portion is within a range the product of the height of the rib section _{(h r)} and the thickness _{(t r)} is ^{2.0 × 10 -3 mm 2 ~5.0 ×} 10 -3 mm 2, wherein Item 10. An absorbent article according to Item 1.   The absorbent article according to claim 1, wherein the peripheral edge of the opening has a skin facing surface curved toward the non-skin facing surface.   The said rib part is an absorbent article as described in any one of Claims 1-3 whose rigidity of the front-end | tip part located in the non-skin opposing surface side is higher than the rigidity of the said opening peripheral part.   The said rib part is an absorbent article as described in any one of Claims 1-4 in which the front-end | tip part located in the non-skin opposing surface side is located inside the said surface sheet.   The top sheet protrudes toward the skin facing surface side in the thickness direction of the absorbent article and continuously extends in the predetermined first direction, and toward the non-skin facing surface side in the thickness direction. 6. The concave-convex structure that is recessed and extends continuously in the first direction has a concavo-convex structure alternately arranged along a second direction orthogonal to the first direction. Absorbent article as described in 1.   The said rib part is an absorbent article of Claim 6 with which the front-end | tip part located in the non-skin opposing surface side overlaps with the said protruding item | line part in the said thickness direction.   The said rib part is an absorbent article of Claim 6 with which the front-end | tip part located in the non-skin opposing surface side overlaps with the said ditch | groove part in the said thickness direction.   The absorbent article further includes an absorbent sheet containing a superabsorbent polymer between the top sheet and the absorber, and the absorbent sheet overlaps with the low friction member in the thickness direction. The absorptive article according to any one of claims 1 to 8. The absorber comprises an upper absorbent layer located on the skin facing surface side and a lower absorbent layer located on the non-skin facing surface side,
The upper absorbent layer has an upper groove portion that extends in the longitudinal direction in the crotch region and penetrates the upper absorbent layer in the thickness direction,
The upper layer groove portion has an angle formed by each wall surface of the one side end portion and the other side end portion in the width direction and a virtual bottom surface of the upper layer groove portion, and each wall surface of the abdomen side end portion and the back side end portion in the longitudinal direction. The absorbent article as described in any one of Claims 1-9 which is near perpendicular | vertical rather than the angle | corner which the virtual bottom face of the said upper layer groove part makes.   The said low friction member is an absorbent article as described in any one of Claims 1-10 currently formed by the resin-made sheet-like member containing a high density polyethylene in the ratio of 50 mass% or more.   The absorptive article according to claim 11 in which said resin sheet-like member contains said high-density polyethylene and low-density polyethylene by mass ratio in the range of 50/50-75/25.   The said surface sheet and the said low friction member are at least partially joined via the low tack adhesive which the measured value of a probe tack test will be 0.78 N or less, Any one of Claims 1-12 The absorbent article according to one item.   The absorbent article according to any one of claims 1 to 13, wherein the low-friction member is formed by a sheet-like member in which both end portions in the width direction are displaced toward the skin facing surface side. .   The absorbent article has at least one folding line extending in the width direction for folding the absorbent article in a developed state in the longitudinal direction, and the low friction member is folded in the plan view. The absorbent article as described in any one of Claims 1-14 arrange | positioned in the position which does not overlap with a line.

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