JP6727169B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as urine absorbing pads and disposable diapers, and particularly to absorbent articles in which skin diseases such as pressure ulcers and rashes are less likely to occur on the skin of a wearer.

In recent years, in absorbent articles such as urine absorbing pads and disposable diapers, various measures have been studied for improving skin diseases such as pressure ulcers and rashes (dermatitis) that occur on the skin of the wearer.

As such an absorbent article, for example, in Patent Document 1, 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 a left side portion of the pad are provided. A left side seat provided on the pad, a right side seat provided on the right side of the pad, an overlap seat provided on the buttocks region, and a low friction member provided between the overlap seat and the inner surface sheet. Disclosed is a disposable urine absorbing pad with pressure ulcer prevention function, in which the right side edge and the left side edge of the wrap sheet are joined to the left side portion of the right side sheet and the right side portion of the left side sheet, respectively. The disposable urine absorbing pad disclosed in Patent Document 1 can be manufactured at low cost, and since the overlap sheet easily moves in the front-rear direction relative to the inner surface sheet, it prevents the occurrence and deterioration of pressure ulcers. It is said to have a function.
Further, in Patent Document 1, as the above-mentioned overlap sheet, it is also disclosed to use a sheet that can expand and contract at least in the front-back direction of the urine absorbing pad, and by using such an expandable sheet, the bed can be It is said that the overlap sheet can move together with the buttocks when the wearer's buttocks shift forward while using a wheelchair or when using a wheelchair, so it is possible to prevent the occurrence and deterioration of pressure ulcers. ..

JP, 2014-155609, A

However, an absorbent article such as a urine absorbing pad can be used for a long period of time while coping with various changes in the posture of the wearer that occur when the user raises the bed, uses a wheelchair, or rolls over while sleeping. Since it is used, if only a stretchable sheet such as the urine absorbing pad disclosed in Patent Document 1 is used as the overlap sheet (cover sheet), the wearer may change due to the above-mentioned change in body position of the wearer. When a situation in which the buttocks of the absorbent article repeatedly move so as to shift in the front-rear direction occurs repeatedly, the cover is applied by the force (deviation force) applied toward the rear side in the longitudinal direction of the absorbent article while the body pressure of the wearer is applied. The stretchable portion of the sheet (generally, the stretchable portion has a reduced strength due to the structure exhibiting the stretchability), and a plurality of wrinkles gather together. It becomes a state that it contracts in the longitudinal direction, and that state is maintained by the repeated shearing force, and it is difficult to restore to the original state, so the intended function of the cover sheet (that is, the cover sheet is The function of moving according to the movement of the buttocks and making it difficult to give physical irritation to the skin of the wearer due to friction or shear force) is not fully exerted, resulting in discomfort to the wearer. , There is a risk of causing or exacerbating skin diseases such as pressure ulcers near the buttocks of the wearer (specifically, near the sacrum).

Therefore, the present invention provides an absorbent article that is unlikely to cause discomfort to the wearer even when the displacement force is repeatedly applied for a long time, and that is unlikely to cause the occurrence or deterioration of skin diseases such as pressure ulcers. The purpose is to do.

One aspect of the present invention (Aspect 1) has a longitudinal direction, a width direction, and a thickness direction, and has a front region, a rear region, and a central region located between these regions in the longitudinal direction. An absorbent article, wherein the absorbent article is a main portion having a liquid-permeable topsheet, and is located at least on the skin-facing surface side of the topsheet in the rear region and is part of the main portion. And a cover sheet that is joined to each other, the cover sheet having at least an extension region that can extend in the longitudinal direction, and at least one strength holding portion extending in the longitudinal direction in the extension region. The above-mentioned absorbent article having.

Since the absorbent article of the present aspect 1 has one or a plurality of strength retaining portions extending in the longitudinal direction in the stretched region of the cover sheet, when the absorbent article is subjected to a longitudinal displacement force. , The expansion area of the cover sheet is unlikely to be in a state of being contracted in the longitudinal direction due to the gathering of a plurality of wrinkles, and the expansion area of the cover sheet is temporarily increased due to the repeated application of the displacement force for a long time. Even when it is contracted in the longitudinal direction, the strength (rigidity) of the strength retaining portion makes it easy to restore the original state.
Therefore, the absorbent article according to the present aspect has the intended function of the cover sheet (that is, the cover sheet is not worn by the wearer) not only when the displacement force is applied singly but also when the displacement force is repeatedly applied over a long period of time. The function of moving or extending according to the movement of the buttocks and making it difficult to give physical irritation to the wearer's skin due to friction or shear force), resulting in discomfort to the wearer. It is possible to prevent the occurrence of skin diseases such as pressure ulcers and the occurrence of exacerbation of skin diseases such as pressure ulcers.

In the present specification, the “excretion liquid” to be absorbed by the absorbent article is not particularly limited as long as it can be absorbed and retained by the absorbent body described later, and for example, liquid such as urine, sweat, blood and the like. In addition to products, low viscosity products such as loose stools are also included.

Further, in another aspect (aspect 2) of the present invention, in the absorbent article according to aspect 1, the cover sheet has a lateral non-stretch extending in the longitudinal direction at each of both ends in the width direction. It has a region and is joined to the main portion in the lateral non-extension region.

In the absorbent article according to the second aspect, the cover sheet is formed by the non-stretching region in the peripheral portion of the joint portion between the cover sheet and the main portion, where stress is likely to be concentrated when a displacement force is applied in the longitudinal direction. Since a certain level of strength is ensured, even if the displacement force is repeatedly applied for a long time, the cover sheet is unlikely to tear, and the above-described function of the cover sheet can be more stably exhibited. As a result, the absorbent article of the present aspect has the above-described action and effect (that is, the action and effect that it is difficult to cause discomfort to the wearer, and it is possible to prevent the occurrence and deterioration of skin diseases such as pressure ulcers). It can be played more stably over a longer period of time.

Further, in another aspect (aspect 3) of the present invention, in the absorbent article according to the aspect 1 or 2, the extension region has the strength retaining portion at least at one end portion of both end portions in the width direction. And an end portion side extension portion adjacent to the width direction, the end portion side extension portion, the ridge portion protruding toward the skin facing surface side in the thickness direction and continuously extending in the width direction, and the thickness. The concave groove portion that is recessed in the non-skin facing surface side in the depth direction and that continuously extends in the width direction has a concavo-convex structure arranged so as to be alternately repeated in the longitudinal direction, and the convex stripe portion is further provided. Is a first ridge portion that is long in the width direction and is in contact with the width direction end edge of the extension region, and a second protrusion portion that is short in the width direction and is not in contact with the width direction end edge of the extension region. And the cover sheet has, in plan view, the main portion in a region that overlaps with an end of the first ridge portion on the outer side in the width direction and does not overlap with the second ridge portion. Is joined to.

In the absorbent article according to the third aspect, the extension region of the cover sheet has the specific uneven structure, and the cover sheet is a part of the specific uneven structure (that is, the width direction outward of the first ridge portion). Since it is joined to the main part in a specific area including the end portion on the side), the above-described first ridge portion ensures the extension area of the cover sheet as wide as possible in the width direction, Stress is concentrated when a displacement force is applied in the longitudinal direction of the absorbent article due to a portion (a non-shaped portion described later) between the end portion on the outer side in the width direction of the second ridge portion and the joint portion. Since it is possible to secure a certain strength in the peripheral portion of the joint between the easy-to-cover cover and the main part, even if the slipping force is repeatedly applied for a long period of time, the cover sheet is unlikely to tear and the above-mentioned cover The function of the seat can be more reliably and stably exhibited.

In still another aspect (aspect 4) of the present invention, in the absorbent article according to the aspect 3, the end-side extending portion has the first ridge portion and the second ridge portion, the concave groove portion. Through, are arranged so as to be alternately repeated in the longitudinal direction.

In the absorbent article according to the present aspect 4, the first ridge portion and the second ridge portion are arranged so as to be alternately repeated in the longitudinal direction via the groove portion in the end side extension portion of the cover sheet described above. Therefore, the portion between the end on the outer side in the width direction of the second ridge and the joint (that is, stress is concentrated when a displacement force is applied to the absorbent article in the longitudinal direction). In the peripheral portion of the joint portion between the cover sheet and the main portion, which can be easily secured, portions where a certain strength can be secured) are formed at regular intervals along the longitudinal direction of the cover sheet to resist the above-mentioned displacement force. The strength can be secured more stably along the longitudinal direction of the cover sheet.

In still another aspect (aspect 5) of the present invention, in the absorbent article according to any one of the above aspects 1 to 4, the strength retaining portion includes a front side edge to a rear side edge in the longitudinal direction of the extension region. Has been extended to.

In the absorbent article of the fifth aspect, since the strength retaining portion of the cover sheet extends from the front side edge to the rear side edge in the longitudinal direction of the extension region, the function of the strength retaining section described above (that is, the absorption). When a longitudinal article is subjected to a shearing force in the longitudinal direction, it is difficult for the stretched area of the cover sheet to shrink in the longitudinal direction due to multiple wrinkles gathering together. Thus, even if the stretched region of the cover sheet is contracted in the longitudinal direction, the function of facilitating the restoration to the original state can be exerted over the entire stretched region in the longitudinal direction.

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 absorbent article is located between the surface sheet and the cover sheet in the thickness direction. Further including a low friction member, the cover sheet is located in front of the front side edge in the longitudinal direction of the low friction member in a plan view and extends in the width direction. Has an area.

Since the absorbent article according to the sixth aspect further includes a low-friction member located between the topsheet and the cover sheet (that is, located on the non-skin-facing surface side of the cover sheet), the low-friction member is interposed. By doing so, the frictional resistance between the cover sheet and the top sheet is reduced, and the cover sheet can be moved or extended more smoothly in accordance with the movement of the buttocks of the wearer, and as a result, the above-mentioned cover sheet The function can be more effectively and surely exhibited.
Further, the absorbent article of the present aspect has a non-stretching region (front side non-stretching region) extending in the width direction in a portion on the front side of the portion where the cover sheet overlaps the low friction member in the thickness direction. Therefore, it is possible to secure a certain strength against the above-mentioned displacement force in the front side portion of the cover sheet, and the cover sheet may shrink in the longitudinal direction as described above or may be torn. , Is even more difficult to occur.

In still another aspect (aspect 7) of the present invention, in the absorbent article according to any one of the above aspects 1 to 6, the absorbent article has both end portions in the width direction of the cover sheet and the thickness direction. And has a pair of side-side joints for joining the cover sheet and the main portion, and each of the pair of side-side joints is an outer side in the width direction. And a second joint portion located in the longitudinal direction and extending in the longitudinal direction, and a second joint portion located inward in the width direction and extending in the longitudinal direction. Of the front side edge of the cover sheet overlaps with the front side edge of the cover sheet in the thickness direction, while the front side edge of the second joint portion is rearward of the front side edge of the cover sheet. positioned.

In the absorbent article according to the seventh aspect, since the cover sheet is joined to the main part by the pair of side-side joining portions having the above-described specific form, a shift force is applied to the cover sheet in the longitudinal direction of the absorbent article. If the front side portion of the second joint portion, which is the portion where the stress is most likely to be concentrated, is not joined to the main portion, the stress applied to the front side portion is released (distributed to other portions), and the cover The sheet can be made more difficult to tear, and the cover sheet can be more steadily fixed to the main portion by the first joint portion located on the outer side in the width direction than the second joint portion. .. Thereby, the absorbent article of this aspect can stably exhibit the function of the cover sheet described above for a longer period of time.

In still another aspect (eighth aspect) of the present invention, in the absorbent article according to the seventh aspect, the main portion extends in the longitudinal direction at both end portions in the width direction and the skin-facing surface side of the surface sheet. Further includes a pair of side sheets, further, each of the pair of side sheets and both ends in the width direction of the cover sheet are respectively joined by the pair of lateral side joints, Each of the pair of side sheets and both end portions in the width direction of the topsheet are joined by outer joint portions that are separated from the pair of side joint portions by a predetermined distance outward in the width direction. Has been done.

In the absorbent article according to the eighth aspect, each of the pair of side sheets is joined to the cover sheet and the top sheet, and the side is a joint portion between each of the pair of side sheets and the cover sheet. Since the joint portion and the outer joint portion, which is the joint portion between each of the pair of side sheets and the surface sheet, are separated from each other, the separated portions (that is, the side joint portion and the outer portion). While maintaining a region (hereinafter, may be referred to as "cover sheet movement allowance") in which the movement or extension of the cover sheet in the longitudinal direction is allowed due to the presence of the portion between the side joint portion), The cover sheet can be displaced so as to rise above the surface sheet when the pair of side sheets stands up. Thereby, the absorbent article of the present aspect, even when the above-mentioned displacement force is applied, the displacement force at the portion between the side-side joint portion and the outer-side joint portion of the pair of side sheets described above. While relaxing, the cover sheet can be smoothly and reliably moved or extended in accordance with the movement of the wearer's buttocks.

In still another aspect (aspect 9) of the present invention, in the absorbent article according to any one of the above aspects 1 to 8, the cover sheet has a rear side end portion extending in the width direction. Having a width direction first region, a width direction central region, and a width direction second region that divide the width direction into three equal parts, and the cover sheet is the width direction first region and the width direction second region, While being joined to the topsheet, in the widthwise central region, it is not joined to the topsheet or only part thereof is joined to the topsheet.

In the absorbent article according to the present aspect 9, since the rear end portion of the cover sheet is joined to the top sheet in the above-described specific form, while sufficiently securing the movement allowance of the cover sheet in the widthwise central region, In the widthwise first region and the widthwise second region, the movement of the cover sheet can be restricted within a predetermined range so that the cover sheet does not excessively move or extend in the longitudinal direction. As a result, the absorbent article of the present embodiment is less likely to form a difficult-to-restore state (for example, a state where wrinkles are strongly wrinkled) that may be caused by excessive movement or extension of the cover sheet, and The function can be exhibited more reliably.

In still another aspect (Aspect 10) of the present invention, in the absorbent article according to any one of the above aspects 1 to 9, the absorbent article extends in the longitudinal direction for folding the absorbent article in the width direction. It has at least one fold line, and the strength retaining portion overlaps with the fold line.

In the absorbent article of the tenth aspect, since the strength retaining portion of the cover sheet overlaps the fold line for folding the absorbent article in the width direction, the strength retaining portion has a crease extending in the longitudinal direction. Thus, the cover sheet can be made less likely to be wrinkled.

In still another aspect (Aspect 11) of the present invention, in the absorbent article according to any one of the above aspects 1 to 10, the main portion is located on the non-skin facing surface side of the surface sheet from the front region to the rear region. The absorbent body extending up to, and the skin facing surface side of the absorbent body, located at the center in the longitudinal direction of the absorbent article and located rearward of the longitudinal center axis extending in the width direction, and And an absorbent sheet extending so as to straddle the front side edge of the cover sheet in the longitudinal direction in the longitudinal direction.

Since the absorbent article according to this aspect 11 further includes an absorbent sheet arranged at the above-mentioned specific position in addition to the absorbent body, the absorbent article is provided even when the excreted liquid is repeatedly supplied from the wearer. The excretory liquid flowing toward the rear side in the longitudinal direction of the can be gradually absorbed by the absorbent body and the absorbent sheet. Thereby, the absorbent article of the present aspect, the wearer's buttocks are hard to be wet with excretion liquid, further, since the cover sheet can be wet with the excretion liquid, it is possible to prevent the strength from decreasing, the above-mentioned action effect Can be exhibited over a longer period of time.

ADVANTAGE OF THE INVENTION According to this invention, even when a slip force is repeatedly applied over a long period of time, it is difficult to cause discomfort to a wearer and to provide an absorbent article that can prevent the occurrence or deterioration of skin diseases such as pressure ulcers. can do.

FIG. 1 is a plan view of a urine absorbing pad according to one embodiment of the present invention when viewed in a thickness direction from a surface sheet side in a developed state. FIG. 2 is a cross-sectional view of a cross section taken along line II-II of FIG. 1 in the urine absorbing pad according to the embodiment of the present invention. FIG. 3 is a cross-sectional view of a cross section taken along line III-III of FIG. 1 in the urine absorbing pad according to the embodiment of the present invention. FIG. 4 is a plan view of a cover sheet used in the urine absorbing pad according to the embodiment of the present invention. FIG. 5 is an enlarged plan view of an essential part of the cover sheet shown in FIG. FIG. 6 is a cross-sectional view of a cross section taken along line VI-VI of the cover sheet shown in FIG. FIG. 7 is a cross-sectional view of a cross section taken along line VII-VII of the cover sheet shown in FIG. FIG. 8 is a plan view of a modified example of the cover sheet. FIG. 9( a) is an explanatory view schematically showing a state immediately after the wearer wears the urine absorbing pad according to the embodiment of the present invention (a state in which the displacement force is not applied), and FIG. 6] is an explanatory view schematically showing a state in which a urine absorbing pad is displaced from that state.

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In addition, in the present specification, unless otherwise specified, "an object placed on a horizontal surface in a developed state (for example, an absorbent article, a surface sheet, a cover sheet, an absorber, a low friction member, etc.) is "Viewing in the thickness direction of the object from the upper side in the direction (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 the present specification are as follows unless otherwise specified.
In the present specification, "longitudinal direction" refers to "a direction in which a vertically long object (for example, absorbent article, absorbent body, etc.) has a long length in a plan view", and "width direction" means "in a plan view". The "longitudinal direction in which the length of the object is shorter (shorter direction)" is referred to, and the "thickness direction" is the "direction perpendicular to the object placed on the horizontal plane in the unfolded state". The direction, the width direction, and the thickness direction are orthogonal to each other. In the present specification, the “plane direction” means a direction in which a plane of a substantially sheet-shaped object (for example, an absorbent article, a surface sheet, an absorber, 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 relative proximal side to a longitudinal center axis C _W that is located in the longitudinal center of the object and extends in the width direction” is defined. It is referred to as “the inner side in the longitudinal direction” or “the inner side in the longitudinal direction”, and “in the longitudinal direction of a vertically long object, the distal side relative to the longitudinal central axis C _W ” is defined as the “longitudinal direction”. Outer side” or “longitudinal outer side”. Similarly, "in the width direction of the vertically long object, a relative proximal side to the width direction central axis C _L which is located in the center of the object in the width direction and extends in the longitudinal direction" is defined as "the width direction. "Inner side" or "width direction inner side", and "in the width direction of the vertically long object, the distal side relative to the width direction central axis C _L " is defined as "the width direction outer side". Or “outer side in the width direction”.
In addition, in the present specification, unless otherwise specified, in the thickness direction of the absorbent article, “at the time of wearing the absorbent article, the side relatively close to the skin surface of the wearer” is defined as “skin-facing surface”. The “side” is referred to as “side”, and the “distal side relative to the wearer's skin surface when the absorbent article is worn” is referred to as “non-skin facing surface side”. Here, "when worn" means a period from when the wearer wears the absorbent article (that is, when the wearable state is formed) to when the wearer maintains the state (while wearing). means.
In addition, in the present specification, the "skin-facing surface side" and the "non-skin-facing surface side" of various members (for example, a surface sheet, an absorber, a low-friction member, a cover sheet, etc.) constituting the absorbent article The “surface” may be simply referred to as “skin-facing surface” and “non-skin-facing surface”, respectively.

FIG. 1 is a plan view of a urine absorbing pad 1 (absorbent article) according to an embodiment of the present invention when viewed in a thickness direction T from a surface sheet side in an unfolded state, and FIGS. FIG. 2 is a cross-sectional view of a cross section taken along line II-II and line III-III of FIG. Further, FIG. 4 is a plan view of the cover sheet 3 used in the urine absorbing pad 1, and FIG. 5 is an enlarged plan view of an essential part of the cover sheet 3 shown in FIG. Further, FIGS. 6 and 7 are cross-sectional views of the cross section of the cover sheet 3 taken along line VI-VI and line VII-VII in FIG. 5, respectively.

As shown in FIG. 1, a urine absorbing pad 1 according to an embodiment of the present invention has a vertically long outer shape having a longitudinal direction L and a width direction W in a plan view, and further, a substantially longitudinal direction L. The central portion has a substantially hourglass-shaped outer shape that is constricted toward the inner side in the width direction W. In addition, in the present invention, the outer shape of the absorbent article is not limited to such a shape, and various applications may be used as long as the length dimension in the longitudinal direction L is longer than the width dimension in the width direction W. Any shape (for example, a rectangle, an ellipse, a gourd shape, etc.) according to the above can be adopted.

As shown in FIG. 1, the urine absorption pad 1 according to the present embodiment has a front region _AF in the longitudinal direction L corresponding to the wearer's abdomen (more specifically, a lower abdomen) in the longitudinal direction L, and in the wearing time. (more specifically, the crotch) crotch of the wearer and the central region a _C corresponding to (more specifically, buttocks) back of a wearer and a rear region a _B corresponding to, the Have in order. In the present specification, in the longitudinal direction of the absorbent article, "relatively proximal side to the wearer's abdomen when wearing the absorbent article" is referred to as "front side", and "wearing the absorbent article". Sometimes "relative to the wearer's back" is referred to as "rear side".

As shown in FIGS. 2 and 3, the urine absorbing pad ₁ includes a liquid-permeable surface sheet 21 located on the skin-facing surface side S ₁ of the urine absorbing pad 1 in the thickness direction T, and the surface sheet 21. and absorbent of the absorbent body 22 is located in the non-skin facing side S _2, a back sheet 23 positioned in the non-skin-facing side S ₂ of the absorbent body 22, both end portions in the width direction W of the urine absorbing pad 1 In the pair of side sheets located on the skin facing surface side S ₁ of the top sheet 21 (specifically, the side sheet 24 arranged at one end in the width direction W and the other end in the width direction W). The side sheet 25) disposed on the upper surface, the main sheet 2 including the liquid-impermeable leak-proof sheet 26 located between the absorber 22 and the back sheet 23, and the top sheet 21 in the rear area A _B. a sheet-like low friction members 4 located on the skin facing side S ₁ of the cover sheet 3 located on the skin facing side S ₁ of the low-friction member 4 in the rear region a _B, skin-facing side of the absorbent body 22 An absorbent sheet 8 located on the rear side S _B of the side S ₁ with respect to the longitudinal center axis C _W and extending so as to straddle the front end edge 3E _F of the cover sheet 3 in the longitudinal direction L. There is.
As shown in FIGS. 1 and 2, the pair of side seats 24, 25 described above has respective end portions on the inner side in the width direction W when the urine absorbing pad 1 is worn (that is, the width of the side seat 24). The inner end 24R in the direction and the inner end 25L in the width direction of the side seat 25 stand up due to the contraction of the elastic member 27 such as rubber thread provided at the end, and the leakage of excreted liquid such as urine. It is possible to form the leak preventive wall portion 28 for preventing the above.

Urine absorbing pad 1 of this embodiment, in the rear region A _B corresponding to the buttock skin disease prone wearer such pressure ulcers and rash, low-friction member located on the skin facing side S ₁ of the topsheet 21 4 and a cover sheet 3 located on the skin-facing surface side of the low friction member 4 and partially joined to the main portion 2. Further, the cover sheet 3 is as shown in FIG. Are joined to the pair of side sheets 24 and 25 of the main portion 2 at both ends 3E _L and 3E _R in the width direction W, respectively, and as the pair of side sheets 24 and 25 stand, the surface sheet 21 and the low friction member 4 can be separated from the skin-facing surface so as to float. As a result, in the urine absorbing pad 1, the friction resistance between the cover sheet 3 and the top sheet 21 is reduced due to the interposition of the low-friction member 4 and the lift of the cover sheet 3, so that the cover sheet 3 becomes the top sheet. It is easy to move in the plane direction relative to 21.

In addition, in the present embodiment, the cover sheet 3 has an extension region 32 that can extend in the longitudinal direction L as shown in FIGS. 1, 2, and 4 to 7, and in the extension region 32, the cover sheet 3 extends in the longitudinal direction. It has a plurality of strength holding portions 31 extending to L. In addition, in this embodiment, as shown in FIG. 4, it has seven strength holding portions 31 extending in the longitudinal direction L and arranged at predetermined intervals in the width direction W.
Furthermore, as described later, the extension region 32 protrudes toward the skin facing surface side S ₁ in the thickness direction T of the urine absorbing pad 1 and continuously extends in the direction along the width direction W of the urine absorbing pad 1. The strip portion 32A and the concave groove portion 32B that is recessed toward the non-skin facing surface side S ₂ in the thickness direction T of the urine absorbing pad 1 and continuously extends in the direction along the width direction W of the urine absorbing pad 1 The extending portion includes an extending portion having an uneven structure arranged so as to be alternately repeated along the longitudinal direction L of the taking pad 1, and the uneven structure of the extending portion is formed on the nonwoven fabric as the base material of the cover sheet 3 by gear shaping. Since it is formed of, the strength is relatively low. On the other hand, since the strength retaining portion 31 is compressed in the thickness direction T or has not been subjected to gear shaping or the like, it has a strength (rigidity) equal to or higher than the strength of the non-woven fabric as the base material of the cover sheet 3. The strength is relatively higher than that of the above-mentioned extension portion.
Here, FIG. 9A is an explanatory view schematically showing a state immediately after a wearer (not shown) wears the urine absorbing pad 1 according to the present embodiment (a state in which the displacement force F _Z is not applied). FIG. 9B is an explanatory diagram schematically showing a state in which the urine absorbing pad 1 is subjected to the displacement force F _Z from that state.

As described above, in the urine absorbing pad 1 according to the present embodiment, since the cover sheet 3 has the extension region 32 that can extend in the longitudinal direction L, the extension region 32 has the shape of the wearer's skin surface (body). It is possible to closely adhere to each other by following the shape). Thereby, even if the wearer moves while wearing the urine absorbing pad 1, the above-mentioned cover sheet 3 accurately moves or extends in the plane direction together with the wearer's skin in accordance with the movement of the buttocks of the wearer. Therefore, it is difficult for the wearer's skin to be physically stimulated by friction or shear force.
Further, since the urine absorbing pad 1 has the strength holding portion 31 extending in the longitudinal direction L in the extension region 32 of the cover sheet 3, the urine absorbing pad 1 is subjected to the displacement force in the longitudinal direction L. If the extension region 32 of the cover sheet 3, on the strength maintaining portion 31 is less likely to state contracted in the longitudinal direction L and huddled plurality of wrinkles W _R as shown in FIG. 9 (b), if, Even if the extension area 32 of the cover sheet 3 is contracted in the longitudinal direction L due to the repeated application of the displacement force for a long time, it is easy to restore the original state as shown in FIG. 9A. Has become. As a result, the urine absorbing pad 1 does not move in accordance with the intended function of the cover sheet 3 (that is, the cover sheet 3 does not move according to the movement of the buttocks of the wearer) even when the displacement force is repeatedly applied for a long time. It is possible to sufficiently exert the function of making it hard to give physical irritation to the wearer's skin by friction or shear force), and as a result, it is hard to cause discomfort to the wearer, and to prevent pressure ulcers and the like. The occurrence and deterioration of skin diseases can be made less likely to occur.

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

<Main part>
In the urine absorbing pad 1 according to the above-described embodiment, the main portion 2 is, as shown in FIGS. 1 to 3, a liquid-permeable topsheet 21 located on the skin-facing surface side S ₁ of the urine absorbing pad 1, The absorbent body 22 located on the non-skin facing surface side S ₂ of the top sheet 21, the back sheet 23 located on the non-skin facing surface side S ₂ of the absorbent body 22, and the width of the urine absorbing pad 1. A pair of side sheets 24 and 25 located on the skin-facing surface side S ₁ of the top sheet 21 at both ends in the direction W, and a liquid-impermeable leak-proof sheet 26 located between the absorber 22 and the back sheet 23. , Is included as a basic configuration.

Here, in the present specification, "both ends in the width direction" are "ends on one side and ends on the other side in the width direction of an object (eg, absorbent article, main part, cover sheet, etc.)". Further, the "widthwise end portion" includes "a widthwise end edge of an object (an edge located on the outermost side in the widthwise direction) and an inner side in the width direction from the end edge. A portion within a predetermined range (i.e., a portion whose length in the width direction is within 15% of the total length in the width direction)". The same applies to the ends in other directions (for example, the ends in the longitudinal direction).

In addition, the above-mentioned main part is a part which holds a basic function (namely, absorption performance etc.) of an absorptive article, and the constituent element changes with kinds of absorptive article. Therefore, for example, in the case where the topsheet has a predetermined absorption performance, the main part may not include the absorber, and in the case where the leakproof performance is secured, The parts may not include side sheets.

Next, in the present invention, various members that can form a main part of the absorbent article will be described in detail.

[Surface sheet]
In the urine absorption pad 1 according to the above-described embodiment, the topsheet 21 is, as shown in FIGS. 1 to 3, except for a portion overlapping the cover sheet 3 and the low friction member 4 in the thickness direction T. The liquid permeable sheet is arranged at a position where it can directly contact the skin (that is, a position on the skin-facing surface side S ₁ of the urine absorbing pad 1) and through which the excreted liquid discharged from the wearer can pass. ing.

As shown in FIGS. 1 to 3, the topsheet 21 has a longitudinal direction L and a width so as to cover substantially the entire absorber 22 arranged on the non-skin facing surface side S ₂ of the topsheet 21 in plan view. It extends in the direction W and has a vertically long, substantially rectangular outer shape that is long in the direction along the longitudinal direction L of the urine absorbing pad 1. In the absorbent article of the present invention, the outer shape of the topsheet is not limited to such an aspect, and the surface of the absorbent body facing the skin may be covered so as not to be exposed at least in the central region. If there is any, it is possible to adopt an arbitrary outer shape and size according to various uses.

In the present invention, the liquid permeable sheet that can be used as the surface sheet is not particularly limited as long as it has predetermined liquid permeability and touch, and for example, cellulosic fibers or hydrophilically treated thermoplastic resin fibers. Any non-woven fabric such as spun-bonded non-woven fabric, air-through non-woven fabric, SMS non-woven fabric, etc. formed by using the above can be used.

The basis weight and thickness of the liquid-permeable sheet (nonwoven fabric or the like) that can be used as the surface sheet are not particularly limited as long as they do not impair the effects of the present invention, and any basis weight in consideration of desired liquid permeability, touch, etc. And the thickness can be adopted, but it is preferable to use a liquid-permeable sheet having a relatively large thickness as the topsheet from the viewpoint that the return of the excreted liquid is less likely to occur.

Further, in the present invention, the structure of the topsheet is not particularly limited as long as it has a predetermined liquid permeability, touch, etc., and even if it has a substantially flat structure like a general nonwoven fabric, Although it may have any uneven structure such as a structure, from the viewpoint of making it difficult to cause the occurrence or deterioration of skin diseases such as pressure ulcer, the surface sheet, it is preferable to use one having an uneven structure such as a furrow structure. preferable. As such an uneven structure, for example, a ridge portion that protrudes toward the skin facing surface side in the thickness direction of the absorbent article and continuously extends in the direction along the longitudinal direction of the absorbent article, and the thickness of the absorbent article. The groove portion that is recessed toward the non-skin facing surface side in the depth direction and that continuously extends in the direction along the longitudinal direction of the absorbent article is arranged so as to be alternately repeated along the width direction of the absorbent article. Structure and the like.
When the topsheet has such a concavo-convex structure, since the contact area between the topsheet and the wearer's skin or the cover sheet can be reduced, the cover sheet easily moves or extends, and further, The excreted liquid or its moisture absorbed by the absorber may come into contact with the wearer's skin, causing the wearer to feel wet or damp, or causing the wearer's skin to become wet. This can be less likely to occur.

In addition, the extending direction of the ridge portion and the groove portion in the above-described ridge groove structure is not particularly limited, and the ridge portion and the groove portion may extend along any direction such as the width direction of the absorbent article. Furthermore, the internal structure of the ridge is not particularly limited, and the ridge has a hollow internal structure (that is, a structure in which the cross-sectional structure along the direction orthogonal to the extending direction of the ridge is substantially corrugated). May also have a solid internal structure.

The method of imparting the above-mentioned concavo-convex structure to the surface sheet is not particularly limited, and for example, a method of continuously blowing a gas (for example, air etc.) to the fibrous web, a compression molding method, a gear stretching method, or any other arbitrary method. The shaping method can be adopted.

In the present invention, the topsheet may be bonded to the non-skin facing surface of the pair of side sheets located on the skin facing surface side, or may be bonded to the skin facing surface or the non-skin facing surface of the absorber. It may be joined to the skin-facing surface of the leak-proof sheet or the back sheet. The joining method is also not particularly limited, and any joining means such as a hot melt type adhesive or heat fusion can be adopted.

[Absorber]
Next, an absorber that can be used in the absorbent article of the present invention will be described. In the urine absorbing pad 1 according to the above-described embodiment, the absorbent body 22 includes the top sheet 21 and the back sheet 23 (more specifically, in the thickness direction T of the urine absorbing pad 1 as shown in FIGS. 1 to 3. , The leak preventive sheet 26) and absorbs and retains the excreted liquid of the wearer that has permeated the top sheet 21.

As shown in FIG. 1, the absorbent body 22 includes a front region A _F (specifically, in the vicinity of the front side edge 1A in the longitudinal direction L) to a rear region A _B (specifically, in the urine absorbing pad 1 in a plan view. Specifically, it extends over the rear side edge 1B in the longitudinal direction L) and extends over the urine absorbing pad 1 from one side edge in the width direction W to the other side edge in the width direction W. The urine absorbing pad 1 is formed to be long in the direction along the longitudinal direction L, and has a substantially hourglass-shaped outer shape in which a substantially central portion in the longitudinal direction L is constricted toward an inner side in the width direction W. doing. In the present invention, the outer shape of the absorber is not limited to such an aspect, and may have any outer shape such as a rectangular shape and an oval shape as long as it can exhibit a predetermined absorption performance. May be.

Also, regarding the position in plan view where the absorbent body is arranged, the center portion of the absorbent article including the intersection of the widthwise central axis C _L extending in the longitudinal direction _L and the longitudinal central axis C _W extending in the widthwise direction is included. There is no particular limitation as long as it is a position where the absorbent body is located.

In the present invention, the absorbent member that can be used as the absorbent body is not particularly limited as long as it can absorb and retain excretory liquid such as urine, and any absorbent member known in the art can be adopted. You can Examples of such an absorbent member include an absorbent core formed of an absorbent material described below and covered with a core wrap sheet such as a hydrophilic tissue. Here, examples of the absorbent material forming the absorbent core include hydrophilic fibers and superabsorbent polymers, and more specifically, cellulosic fibers such as crushed pulp, cotton, rayon, and acetate; acrylic. Granules composed of superabsorbent polymers such as sodium acid copolymers; and mixtures of these in any combination.

In the present invention, the absorber may be composed of an absorbent member having a multilayer structure in which two or more absorbent layers are laminated in the thickness direction. In this case, each absorbent layer may be composed of absorbent members having the same composition or may be composed of absorbent members having different compositions. Furthermore, the outer shape (top view shape) and size of each absorption layer may be the same or different.

Further, the basis weight and thickness of the entire absorbent body 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, flexibility and the like can be adopted.

In addition to the above-mentioned absorber, the present invention may further include an absorbent sheet that supplements the absorption performance of the absorber. The absorbent sheet will be described later.

[Back sheet]
Next, the backsheet that can be used for the absorbent article of the present invention will be described. In the urine absorbing pad 1 according to the above-described embodiment, the back sheet 23 is arranged on the non-skin facing surface side S ₂ in the thickness direction T of the urine absorbing pad 1, as shown in FIGS. 1 to 3. While having a predetermined breathability, it prevents permeation of excreted liquid such as urine discharged from the wearer, and functions so that the excreted liquid does not leak to the outside (for example, clothes of the wearer). And a liquid impermeable sheet.

As shown in FIGS. 1 to 3, the back sheet 23 extends from the front side edge 1A in the longitudinal direction L of the urine absorbing pad 1 to the rear side edge 1B in a plan view, and the urine absorbing pad 1 1 extends in the width direction W from one side edge to the other side edge, and has a substantially hourglass-shaped outer shape similar to the outer shape of the urine absorbing pad 1. In the present invention, the outer shape of the back sheet is not limited to such an aspect, and may be such that the surface of the non-skin facing surface of the absorber arranged on the skin facing surface side of the back sheet is not exposed. For example, an arbitrary external shape and size according to various applications can be adopted.

In the present invention, the hydrophobic non-woven fabric that can be used as the back sheet is not particularly limited as long as it has predetermined hydrophobicity and air permeability, and examples thereof include spun bond non-woven fabric, point bond non-woven fabric, melt blown non-woven fabric and SMS non-woven fabric (spun non-woven fabric). Any hydrophobic non-woven fabric such as a non-woven fabric having a multi-layered structure of three or more layers (for example, a five-layered structure) including each non-woven fabric layer of a bond layer/melt blown layer/spun bond layer, and an air-through non-woven fabric can be used. Such a hydrophobic nonwoven fabric does not necessarily have liquid impermeability when the absorbent article is provided with a leak-proof sheet between the back sheet and the absorbent body, but in particular, the absorbent article is When the leak preventive sheet is not provided between the back sheet and the absorber, it is preferable to use one having liquid impermeability.

The constituent fibers of the hydrophobic nonwoven fabric are not particularly limited, and examples thereof include polyolefin fibers such as polyethylene and polypropylene; polyester fibers such as polyethylene terephthalate; thermoplastic resin fibers such as various conjugate fibers such as core-sheath conjugate fibers. Can be used. Furthermore, the basis weight and thickness of the hydrophobic nonwoven fabric are not particularly limited as long as they do not impair the effects of the present invention, 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. A property sheet can be used. As the 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 openings).

Further, in the above-described embodiment, the urine absorbing pad 1 includes the liquid-impermeable leak-proof sheet 26 between the back sheet 23 and the absorber 22. The leak-proof sheet 26 is made of a plastic film made of a thermoplastic resin such as polyethylene, prevents permeation of excreted liquid such as urine discharged from the wearer, and prevents the excreted liquid from leaking to the outside. It works. Providing such a leak-proof sheet is not an essential component in the absorbent article of the present invention, but when the absorbent article is provided with a leak-proof sheet, the leakage of excreted liquid such as urine is more effective. Can be suppressed.

In the present invention, the position of the leak preventive sheet is not particularly limited as long as it is a region where the function of the leak preventive sheet can be exhibited, and the leak preventive sheet is the same as in the above-described embodiment. It may be arranged from the front region to the rear region, or may be arranged only in a specific region such as the central region.

[Side sheet]
Next, a pair of side sheets that can be used in the absorbent article of the present invention will be described. In the urine absorbing pad 1 according to the above-described embodiment, the pair of side sheets 24 and 25 are arranged in the width direction of the urine absorbing pad 1 on the skin-facing surface side S ₁ of the topsheet 21, as shown in FIGS. 1 to 3. The belt-shaped side sheet 24 is arranged at one end of W, and the belt-shaped side sheet 25 is arranged at the other end of the urine collecting pad 1 in the width direction W. As shown in FIG. 1, the side sheet 24 on one side and the side sheet 25 on the other side extend from a front side edge 1A in the longitudinal direction L of the urine absorbing pad 1 to a rear side edge 1B in a plan view. As shown in FIG. 2, the width direction outer side end portions 24L of the side seats 24 and the width direction outer side end portions 25R of the side seats 25 located on the outer side in the width direction W are present. , The width direction of the side seat 24, which is located on the inner side in the width direction W, while being joined to one end and the other end of the width direction W of the leak-proof sheet 26 to form a fixed end, respectively. The inner end 24R and the width-direction inner end 25L of the side seat 25 are not joined to any member and form a free end.

In addition, when the absorbent article does not include the above-described leak-proof sheet, the pair of side sheets includes one side end portion (one side end portion 23L in the above-described embodiment) and the other side of the width direction of the back sheet, respectively. It may be joined to the end portion (the other end portion 23R in the above-described embodiment).

Further, in the above-described embodiment, each of the side sheet 24 on one side and the side sheet 25 on the other side in the width direction W has a width near the inner end 24R in the width direction and a width as shown in FIGS. 1 and 3. The elastic member 27 for contracting the side sheet 24 and the side sheet 25 in the longitudinal direction L to erect the widthwise inward end portions 24R and 25L in the vicinity of the direction inner side end portion 25L is the longitudinal direction L. Are arranged along each. Due to the contraction of the elastic member 27, the width direction inner side end portions 24R and 25L of the side seats 24 and 25 are erected to prevent the leakage of excreted liquid such as urine in the width direction. A leak wall 28 is formed.

The elastic member 27 in the present embodiment, as shown in FIG. 1, are disposed from the front region A _F across a broad region extending rearward region A _B in the longitudinal direction L of the urine absorbing pad 1, in the present invention The arrangement form of the elastic member is not particularly limited. For example, the elastic members may be arranged over the entire length in the longitudinal direction of the pair of side seats, or like the above-described embodiment, the vicinity of the front side edge and the vicinity of the rear side edge in the longitudinal direction of the pair of side seats. You may arrange|position in the predetermined range except. In addition, when the elastic member is arranged as in the latter case, there is an advantage that the end portion in the longitudinal direction of the absorbent article is less likely to warp.

In the present invention, the extension ratio at the time of attaching the elastic member to the pair of side sheets is not particularly limited as long as the cover sheet is not excessively stretched and the excretion liquid does not leak easily. For example, within a range of 1.3 to 3.0 times, preferably within a range of 1.5 to 2.5 times, and more preferably within a range of 1.7 to 2.3 times the natural length. is there. In addition, in the above-described embodiment, one elastic member 27 is arranged at each of the width direction inner end 24R of the side seat 24 and one width direction inner end 25L of the side seat 25. The present invention is not limited to this arrangement mode, and two or more elastic members may be arranged on each of the pair of side sheets. As the elastic member, a thread rubber or the like generally used in absorbent articles such as a urine absorbing pad and a disposable diaper can be used.

In addition, in the above-described embodiment, the pair of side sheets 24 and 25 are configured by liquid impermeable sheets having a vertically long strip-shaped outer shape that is long in the longitudinal direction L of the urine absorbing pad 1, as shown in FIG. 1. However, in the present invention, the pair of side sheets is not limited to such an aspect, and a liquid impermeable sheet of any external shape and size as long as it can form a predetermined leakproof wall portion. Can be adopted.

The strip-shaped liquid-impermeable sheet that can be used as the side sheet is not particularly limited as long as it has predetermined liquid impermeability and flexibility, and examples thereof include a hydrophobic nonwoven fabric (for example, having hydrophobicity or hydrophobicity). Spunbonded non-woven fabric, point-bonded non-woven fabric, spunbonded layer/meltblown layer/spunbonded layer (SMS) non-woven fabric), synthetic resin film having liquid impermeability, and laminates thereof. A liquid impermeable sheet can be used.

The basis weight and thickness of the strip-shaped liquid-impermeable sheet that can be used as the side sheet (for example, a hydrophobic nonwoven fabric) are not particularly limited as long as they do not impair the effects of the present invention, and the desired liquid-impermeability and flexibility. Arbitrary basis weight and thickness in consideration of properties and the like can be adopted.

It should be noted that the provision of such a side sheet is not an indispensable constituent requirement in the absorbent article of the present invention, but when the absorbent article is provided with such a side sheet, the width direction of the absorbent article is particularly high. In, in addition to being able to more effectively suppress the leakage of excreted liquid such as urine, the cover sheet is joined to the cover sheet in the surface direction relative to the top sheet, as described above. It has the advantage of being easy to move.

Hereinafter, in the present invention, various members (that is, the cover sheet, the low-friction member, and the absorbent sheet) that constitute the absorbent article other than the above-mentioned main parts will be described in detail.

<Cover sheet>
In the urine absorbing pad 1 according to the above embodiment, the cover sheet 3, Fig. 1, in the rear area A _B of the urine absorbing pad 1 as shown in FIGS. 2 and 4, the low-friction member 4 and the thickness direction T It is located on the skin-facing surface side S ₁ of the low-friction member 4 so as to overlap, and includes the entire low-friction member 4 so that the low-friction member 4 is not exposed in a plan view (that is, The low friction member 4 is disposed between the cover sheet 3 and the top sheet 21). By disposing the cover sheet 3 in this way, it is possible to further reduce the frictional resistance between the cover sheet 3 and the surface sheet 21, and to dispose the cover sheet 3 in the surface direction relative to the surface sheet 21. It can be easy to move.

The cover sheet 3 has a predetermined length in the longitudinal direction L of the urine absorbing pad 1 (for example, 150 mm to 250 mm) and a predetermined width in the width direction W of the urine absorbing pad 1 in plan view. It has a substantially rectangular outer shape that is long in the longitudinal direction L and has a directional length (for example, 100 mm to 200 mm). In the present invention, the outer shape of the cover sheet is not particularly limited as long as the effect of the present invention is not impaired, and any outer shape (for example, a circle, an ellipse, a polygon, etc.) can be adopted.

In the present invention, the material forming the cover sheet is not particularly limited, and for example, any sheet-shaped member such as non-woven fabric such as air-through non-woven fabric and spun-bonded non-woven fabric; woven fabric; knitted fabric; plastic film and the like can be adopted. The sheet-shaped member may be hydrophilic or hydrophobic. Since the cover sheet used in the present invention can directly contact the wearer's skin, it is preferable to use a sheet-shaped member having excellent touch and flexibility among the above-mentioned sheet-shaped members. Examples of such a sheet-like member include non-woven fabrics such as air-through non-woven fabrics and spunbonded non-woven fabrics. Further, the sheet-like member constituting the cover sheet is preferably one having excellent hydrophobicity in that it makes it difficult to wet the skin of the wearer (specifically, the skin of the buttocks). Even when a hydrophilic material is used as the sheet-like member that forms the cover sheet, excreted liquid such as urine and its moisture can be permeated to a certain extent, so that it is between the wearer's skin and the cover sheet. There is an advantage that excreted liquid such as urine and its moisture can be hard to be clogged.

Then, in the present invention, the cover sheet is formed by a sheet-shaped member that can extend in at least one direction (that is, a direction corresponding to the longitudinal direction of the absorbent article), and specifically, at least the absorbent article. Sheet-like sheet having an extension region that can extend in the direction corresponding to the longitudinal direction of the absorbent article, and having one or a plurality of strength holding portions that extend in the extension region in the direction corresponding to the longitudinal direction of the absorbent article. It is formed by a member. In addition, in the above-mentioned embodiment, as shown in FIGS. 1 and 4, the cover sheet 3 includes the extension region 32 that can extend in the longitudinal direction L of the urine absorbing pad 1, and the urine absorbing pad 1 in the extension region 32. 7 strength holding portions 31 that extend in the longitudinal direction L and are arranged at predetermined intervals in the width direction W.
When the cover sheet is formed of such an extensible sheet-like member, the above-mentioned extension region can follow the wearer's body shape and be in close contact with the wearer, so that the wearer wears the absorbent article. Even if it moves inward, the cover sheet described above can be accurately moved or extended in the plane direction along with the wearer's skin in accordance with the movement of the wearer's buttocks, and it can be rubbed against the wearer's skin or It is possible to make it difficult to give a physical stimulus due to a displacement force or the like.
Further, since this cover sheet has one or a plurality of strength holding portions extending in the longitudinal direction in the above-mentioned stretched region, even if the absorbent article is subjected to a longitudinal displacement force, 9B is unlikely to contract in the longitudinal direction L as shown in FIG. 9B, and if the above-mentioned displacement force is repeatedly applied for a long time, the expansion region of the cover sheet contracts in the longitudinal direction. Even in the case of the open state, it is easy to restore the original state as shown in FIG.
Therefore, the absorbent article of the present invention is provided with such a specific extensible cover sheet, so that even if the displacement force is repeatedly applied for a long time, the intended function of the cover sheet (ie, The cover sheet moves or stretches in accordance with the movement of the buttocks of the wearer to sufficiently exert the function of making it difficult to give physical stimulation to the wearer's skin due to friction or displacement force. It is possible to prevent the wearer from feeling uncomfortable and to prevent the occurrence or deterioration of skin diseases such as pressure ulcers.

Here, in the present specification, "extendible" means in two predetermined directions (i.e., at least two directions) contradictory to each other according to the method described in "6.3 Tensile strength and elongation" of JIS L 1913:2010. When pulled by a force of 5.0 N in the longitudinal direction, it extends 3% or more with respect to the length (100%) in the tensile direction of the object in the natural state (that is, the state before being stretched) without breaking. That is, it means that it can be stretched so that the length after tension is 103% or more.

Further, in the present invention, the extension direction in the extension region of the cover sheet is any other direction (for example, the direction corresponding to the width direction) as long as it extends at least in the direction corresponding to the longitudinal direction of the absorbent article. May be extended. Since the cover sheet extends in multiple directions, the cover sheet can more accurately follow the body shape of the wearer.

It should be noted that the stretch region of the cover sheet described above may be stretched in a direction corresponding to at least the longitudinal direction of the absorbent article, regardless of the presence or absence of shrinkage after stretching, and the cover sheet shrinks after stretching. There is no external force caused by the movement of the buttocks of the wearer, even if it is elastic (e.g., having elasticity due to elastic members, etc.) and that is expanded and contracted by the external force caused by the movement of the buttocks of the wearer. For example, it may be one that hardly shrinks.

The stretchable sheet-like member that can be used for the cover sheet is not particularly limited as long as it can be stretched in at least one direction (longitudinal direction of the absorbent article), and for example, it is continuous in the width direction of the absorbent article. A nonwoven fabric or woven or knitted fabric having an uneven structure in which ridges and groove portions extending in the longitudinal direction are alternately repeated in the longitudinal direction; an nonwoven fabric in which elastic members such as elastic fibers are arranged along the longitudinal direction of the absorbent article. Alternatively, a woven or knitted material; and a laminated body in which these are arbitrarily combined can be preferably used. Among them, the non-woven fabric having the above-mentioned concavo-convex structure is not only expandable in the region having the concavo-convex structure, but the contact area with the skin of the wearer is small, and the physical irritation to the skin is also small, so as a cover sheet. It can be used particularly preferably.

Further, in the above-described embodiment, the extension regions 32 of the cover sheet 3 are located at both ends in the width direction W and extend toward the two ends in the longitudinal direction L, as shown in FIGS. 4 and 5. Positioned between the extension portions (specifically, one end-side extension portion 32L and the other end-side extension portion 32R in the width direction W) and these end-side extension portions in the width direction W, and It is configured to include six inwardly extending portions 32C extending in the longitudinal direction L, and seven strength retaining portions 31 arranged adjacent to each other between the extending portions and extending in the longitudinal direction L. ing.

As shown in FIGS. 6 and 7, each of the above-described end side extension portions 32L and 32R and the inward extension portion 32C projects to the skin facing surface side S ₁ in the thickness direction T of the urine absorbing pad 1 and a convex portion 32A to the width direction W continuously extending, and groove portion 32B continuously extending and width direction W recess in the non-skin-facing side S ₂ in the thickness direction T is repeated alternately in the longitudinal direction L It has a specific concavo-convex structure arranged as described above. The interval between the ridges 32A arranged in the longitudinal direction L (that is, the distance between the vertices of the ridges arranged in the longitudinal direction) is not particularly limited, and may be any interval according to desired extensibility, touch, or the like (for example, An interval within the range of 1 mm to 10 mm) can be adopted.

Furthermore, in the above-mentioned end side extension portions 32L and 32R, the convex strip portion 32A has a relatively long width direction length and the width direction edges 32E _L and 32E of the extension region 32, as shown in FIG. _R has a first ridge portion 32A ₁ and a second ridge portion 32A ₂ which is relatively short in the width direction and does not contact the width-direction edges 32E _L and 32E _R of the extension region 32. As shown in FIG. 5, the first ridge portions 32A ₁ and the second ridge portions 32A ₂ are arranged so as to be alternately repeated along the longitudinal direction L via the groove portions 32B. .. Here, the widthwise lengths of the ridge portion 32A (including the first ridge portion 32A ₁ ) and the concave groove portion 32B are not particularly limited, and may be any length according to the desired extensibility, touch, or the like ( For example, a length in the range of 5 mm to 50 mm, etc.) can be adopted, and the difference in the width direction length between the first ridge portion 32A ₁ and the second ridge portion 32A ₂ is not particularly limited. For example, it is in the range of 1 mm to 5 mm.
In FIG. 5, the specific form of the end-side extension part 32R, i.e., the widthwise end of the end portion _{32A 1E} of the first width direction outer side of the convex portion 32A ₁ is extended region 32 edge 32E _R with contact to show a form in which end portions 32A _2E the width direction outer side of the second convex portion 32A ₂ is positioned on the inner side in the width direction W than the widthwise end edges 32E _R extension region 32 ..

If the end side extension portion 32R of the extension region 32 is configured to have such a specific first ridge portion 32A ₁ and second specific ridge portion 32A ₂ , the above-described first ridge portion 32A. the _1, while still ensuring as much as possible wider extension region 32 of the cover sheet 3 in the width direction W, the end portion 32A _2E the width direction outer side of the second convex portion 32A ₂ of the above-described elongation regions 32 Due to the portion in which the concave-convex structure between the widthwise edge 32E _R is not formed (hereinafter, it may be referred to as “the non-shaped portion located on the outer side in the width direction of the second ridge portion”). Since a certain strength can be ensured, even if the displacement force is repeatedly applied for a long time, the cover sheet is unlikely to tear, and the function of the cover sheet can be more reliably and stably exhibited. ..

In addition, in this invention, the end side extension part which has such a specific 1st convex line part and 2nd convex line part may be arrange|positioned only at one end part of the width direction of an expansion|extension area|region. (In this case, the other end is an end-side extension having a ridge and a groove having a constant width in the same manner as the inner extension.), the strength of the cover sheet. Since it is possible to ensure evenly in the vicinity of both end portions in the width direction, the end portion side extension portion having the specific first ridge portion and the second ridge portion is the end portion in the width direction of the extension region. Are preferably arranged in each.

Further, in the present embodiment, as shown in FIG. 6, the ridge portion 32A and the concave groove portion 32B have a concavo-convex shape in which the sectional shape along the longitudinal direction L is a substantially zigzag shape. The specific shapes of the ridges and groove portions are not limited to those having the above-mentioned uneven shape as long as they can impart at least longitudinal stretchability to the cover sheet, and the ridges and groove portions are For example, an arbitrary shape such as a shape in which the cross-sectional shape along the longitudinal direction is substantially corrugated can be adopted.

In the above-described embodiment, the ridge portions 32A and the groove portions 32B of the respective extension portions in the extension region 32 of the cover sheet 3 are thickened by gear shaping to the substantially flat nonwoven fabric which is the base material of the cover sheet 3. It is formed by pressing a predetermined portion forming the convex streak portion 32A and the concave groove portion 32B from both sides in the vertical direction T. Then, at the time of this gear shaping process, by pressing the portions between the respective extension portions from both sides in the thickness direction T at the same time or not, the thickness direction as shown in FIGS. 6 and 7 is obtained. The strength retaining portion 31 is formed at the approximate center of T. Therefore, the strength retaining portion 31 is not formed with the uneven structure such as the above-described convex stripe portion 32A and the concave groove portion 32B, and the strength retaining portion 31 has the thickness direction T as shown in FIGS. 6 and 7. Each of one surface (skin-facing surface 31a) and the other surface (non-skin-facing surface 31b) is substantially flat. The length of the strength retaining portion 31 in the width direction is not particularly limited as long as the effects of the present invention can be exhibited, and for example, any length such as a length within a range of 1 mm to 10 mm can be adopted. Further, the height from the surface 31a of the strength retaining portion 31 on the skin-facing surface side to the apex of the ridge portion 32A is not particularly limited, and may be any height (for example, 0 depending on desired extensibility and touch). A height within a range of 1 mm to 2 mm) can be adopted.

The stretched region 32 formed in this manner has a relatively high strength as the nonwoven fabric serving as the base material is pressed and stretched in the thickness direction T in the ridge portion 32A and the groove portion 32B ( On the other hand, in the strength retaining portion 31, the nonwoven fabric as the base material is not pressed in the thickness direction T because the nonwoven fabric as the base material is pressed in the thickness direction T and compressed. Since its strength is maintained, the strength (rigidity) is relatively high.
Therefore, in the urine absorbing pad 1 according to the present embodiment, in the extension region 32 of the cover sheet 3, since the strength retaining portion 31 having such a relatively high strength extends in the longitudinal direction L, the urine absorbing pad 1 when the shift force in the longitudinal direction L is applied to the 1, extension region 32 of the cover sheet 3, the strength maintaining portion 31, the longitudinal direction L and huddled plurality of wrinkles W _R as shown in FIG. 9 (b) 9A, even if the extension region 32 of the cover sheet 3 is contracted in the longitudinal direction L due to repeated application of the displacement force over a long period of time as shown in FIG. 9A. It is easy to restore to the original state. As a result, the urine absorbing pad 1 has a desired function of the cover sheet 3 (that is, the cover sheet 3 moves or extends in accordance with the movement of the buttocks of the wearer) even when the displacement force is repeatedly applied for a long time. Function, which makes it difficult to give physical irritation to the wearer's skin due to friction or shearing force), and as a result, does not cause discomfort to the wearer and causes skin diseases such as pressure ulcers. It is possible to prevent the occurrence and deterioration of

Here, in the present specification, the strength holding portion refers to a portion in the stretched region having a relatively higher strength (rigidity) than the stretched portion, and its specific strength value is not particularly limited. The strengths of the strength holding portion and the extension portion can be compared, for example, as follows.
First, after producing a measurement sample having a predetermined dimension having the same structure as the strength retaining portion and the extension portion, for each measurement sample, a tensile tester equipped with a load cell having a maximum load capacity of 50 N (Shimadzu By measuring the tensile strength under the same conditions (for example, a chuck distance of 100 mm, a pulling speed of 100 mm/min, etc.) using Autograph Model AGS-1kNG manufactured by K.K. Can be compared. The tensile direction when measuring the tensile strength is the direction corresponding to the longitudinal direction of the absorbent article.

In the present invention, the structure of the strength holding portion in the stretched region of the cover sheet is not particularly limited as long as the strength holding portion can secure the strength in at least the longitudinal direction of the stretched region to a certain extent, and the strength is not particularly limited. The holding part has, for example, a concavo-convex structure smaller than the concavo-convex structure composed of the above-mentioned convex stripes and concave grooves; a strength-reinforcing member (for example, a band-shaped nonwoven fabric or sheet) is attached to a predetermined portion of the base material. Those having a laminated structure; those having a compressed structure in which a predetermined portion of a base material is compressed under heating or non-heating; those having a molten structure in which a predetermined portion of the base material is melted under pressure or without pressure; or It may have a structure in which these structures are arbitrarily combined.

Further, in the above-described embodiment, the strength retaining portion 31 of the cover sheet 3 is continuous from the front end edge 32E _F to the rear end edge 32E _B in the longitudinal direction L of the extension region 32, as shown in FIG. It is arranged to extend to. The strength retaining portion 31 of the cover sheet 3 extends from the front edge 32E _F extension region 32 thus to the rear side edge 32E _B, in the elongation zone 32 the function of the strength retaining portion 31 of the above Since it can be exerted over the entire region in the longitudinal direction L, the urine absorbing pad 1 having such a configuration can more reliably exert the function of the cover sheet 3 described above.

In addition, as shown in FIG. 4, the cover sheet 3 described above has lateral side non-expansion regions (width direction in FIG. 4) extending in the longitudinal direction L at both ends 3E _L and 3E _R in the width direction W, respectively. W has one side side non-expansion region 33L and the other side side non-expansion region 33R), and the side non-expansion regions 33L and 33R are also the same as the strength retaining portion 31 described above. In addition, each of the surface on the skin-facing surface and the surface on the non-skin-facing side has a substantially flat structure, and has relatively high strength.

Furthermore, as shown in FIG. 1, the urine absorbing pad 1 according to the present embodiment has two folding lines extending in the longitudinal direction L for folding the urine absorbing pad 1 in the width direction W (in FIG. 1, , The folding line L ₁ on one side in the width direction W and the folding line L ₂ on the other side in the width direction, which are provided so as to sandwich the central axis C _L in the width direction.), the strength retaining portion 31 of the cover sheet 3 is , And are arranged so as to overlap these folding lines L ₁ and L ₂ . Thus, when the strength retaining portion 31 of the cover sheet 3 overlaps the folding lines L ₁ and L ₂ extending in the longitudinal direction L of the urine absorbing pad 1, the strength retaining portion 31 has a crease extending in the longitudinal direction L. When applied, the cover sheet 3 can be made more difficult to be wrinkled.

In the present invention, the number of folding lines for folding the absorbent article in the width direction is not particularly limited as long as it does not impair the effects of the present invention, and any number according to the desired packaging form of the absorbent article or the like. (For example, one, four, etc.) can be adopted.

In addition, the arrangement form of the extension regions in the cover sheet (for example, the number of each extension portion and the strength holding portion, the arrangement position, the lengthwise length and widthwise length of the extension portion, etc.) do not impair the effects of the present invention. There is no particular limitation as long as it is possible to adopt any arrangement form. For example, as a modified example of the cover sheet that can be used in the present invention, there is a cover sheet 3'shown in FIG. Note that, in FIG. 8, the configuration other than the configuration different from the cover sheet 3 of the above-described embodiment is basically the same as that of the cover sheet 3 described above, and thus the description thereof is omitted.
The cover sheet 3′ shown in FIG. 8 has a plan view in which the front edge 4E _F in the longitudinal direction L of the low-friction member 4 arranged on the non-skin facing surface side S ₂ of the cover sheet 3′ is larger than the front edge 4EF. It has a front non-expansion region 34 located on the front side S _F and continuously extending in the width direction W. Secure 'When have such a non-extended area (front side unstretched areas 34), the cover sheet 3' cover sheet 3 a certain strength to resist the displacement force of the above-described in the portion of the front side S _F of the Therefore, it is possible to further prevent the cover sheet 3′ from shrinking or breaking in the longitudinal direction L due to wrinkles.

In the present invention, the proportion of the stretched area in the cover sheet is not particularly limited as long as the effects of the present invention can be obtained. For example, when the stretched area is formed by the uneven structure as described above, The planar view area is an area within a range of more than 50% and 100% or less with respect to the planar view area of the entire cover sheet.

Then, in the above-described embodiment, as shown in FIGS. 1 and 2, in the cover sheet 3, the end portion 3E _L on one side in the width direction W is the inner side in the width direction of the side sheet 24 on the one side described above. while being joined to the end portion 24R side of the inner side portion 24S, the inner end 3E _R of the other side in the width direction inner side end portion 25L side of the other side of the side sheet 25 described above in the widthwise direction W It is joined to the side portion 25S. As shown in FIG. 1, the joining of the cover sheet 3 and the side sheets 24, 25 is performed from the front end edge 3E _F to the rear end edge in the longitudinal direction L of the cover sheet 3, respectively, in the longitudinal direction. A pair of side joints 5 and 5 extending in L (more specifically, a first joint 51 located on the outer side in the width direction W and a second joint located on the inner side in the width direction W). Forming part 52). In this embodiment, the cover sheet 3 does not extend to both ends of the urine absorbing pad 1 in the width direction W.

As described above, the cover sheet 3 is joined to the pair of side sheets 24 and 25 having a large degree of freedom of movement, which can form the leakage preventing wall portion 28, and has a small degree of freedom of movement. Since it is not directly fixed to the members such as 22, the leak-proof sheet 26, and the back sheet 23, the movement of the cover sheet 3 is less likely to be restricted, and rather, the cover sheet 3 is joined to the side sheet having a large degree of freedom of movement. The cover sheet 3 is relatively easy to move with respect to the surface sheet 21 of the urine absorbing pad 1.
Further, in the pair of side sheets 24 and 25 to which the cover sheet 3 is joined, when the urine absorbing pad 1 is worn, the width direction inner side end portions 24R and 25L thereof stand up to form the leak preventive wall portion 28. Therefore, when the pair of side sheets 24, 25 is erected, the cover sheet 3 joined to the pair of side sheets 24, 25 is removed from the surface sheet 21 or the low friction member 4 to the skin facing surface side S. ₁ and the frictional resistance between the cover sheet 3 and the low friction member 4 is further less likely to occur.

In addition, a part of the joint between the cover sheet 3 and each of the side sheets 24 and 25 is in the lateral non-extendable regions 33L and 33R located at both ends 3E _L and 3E _R in the width direction W of the cover sheet 3. The peripheral portion of the joint portion (that is, the first joint portion 51 in the side joint portions 5 and 5) is subjected to stress concentration when a displacement force is applied in the longitudinal direction L of the urine absorbing pad 1. Although the peripheral portion is located in the lateral non-extendable regions 33L and 33R of the cover sheet 3, a certain level of strength is secured, so that the urine absorbing pad 1 has Even when the displacement force in the longitudinal direction L is repeatedly applied for a long time, the cover sheet 3 is less likely to be torn, and the above-described function of the cover sheet 3 can be more stably exhibited. As a result, the urine absorbing pad 1 according to the present embodiment has the above-described operational effect (that is, it is less likely to cause discomfort to the wearer, and can be less likely to cause or worsen skin diseases such as pressure ulcers). ) Can be played more stably over a longer period of time.

Further, a part of the joint between the cover sheet 3 and each of the side sheets 24 and 25 is, in plan view, a width direction of the first ridge portion 32A ₁ in the end side extended portions 32L and 32R of the cover sheet 3. It is also performed in a region that overlaps with the outer end portion 32A _1E and does not overlap with the second ridge portion 32A _2, and the joint portion (that is, the second joint portion in the side joint portions 5 and 5). The peripheral portion of 52) is also a portion where stress is likely to be concentrated when a displacement force is applied in the longitudinal direction L of the urine absorbing pad 1, but the peripheral portion of the above-mentioned second ridge portion 32A ₂ is Since a certain strength is ensured by being located in the region including the non-shaped portion located on the outer side in the width direction, the above-mentioned displacement force is repeatedly applied to the urine absorbing pad 1 for a long time. Even in such a case, the cover sheet 3 is not easily torn, and the above-described function of the cover sheet 3 can be more reliably and stably exhibited.

Moreover, in the above-described embodiment, the first ridge portions 32A ₁ and the second ridge portions 32A _{2 in} the end-side extended portions 32L and 32R of the cover sheet 3 alternate in the longitudinal direction L via the groove portions 32B. The non-shaped portions located on the outer side in the width direction of the above-mentioned second convex stripe portion 32A ₂ are formed at regular intervals along the longitudinal direction L of the cover sheet 3 by being arranged so as to repeat. Therefore, the strength against the above-mentioned displacement force can be secured more stably along the longitudinal direction L of the cover sheet 3.

Then, both end portions 3E L in the width direction W of the cover sheet _3, 3E _R pair of side side joining each and and overlaps in the thickness direction T to bond the said cover sheet 3 and the pair of side sheets 24, 25 As described above, each of the portions 5 and 5 is located on the outer side in the width direction W and extends in the longitudinal direction L, and the first joint portion 51 is located on the inner side in the width direction W and in the longitudinal direction. Although it has the 2nd joint part 52 which extends in L, these 1st joint part 51 and 2nd joint part 52 of 1st joint part 51 are shown in FIG.4 and FIG.5. front edge 51E _F is duplicated on the front side edge 3E _F in the thickness direction T of the cover sheet 3, the front side edge 52E _F of the second joint portion 52, the front end of the cover sheet 3 edge 3E _F It is arranged so as to be positioned on the rear side S _B than. Here, the specific position of the front end edge 52E _F of the second joint portion 52 is not particularly limited, for example, in the range of 1mm~50mm from the front edge 3E _F of the cover sheet 3 rearward is there. In addition, in the present embodiment, the rear side edge 51E _B of the first joint portion 51 and the rear side edge 52E _B of the second joint portion 52 are both the rear side edge of the cover sheet 3 and the thickness direction T. Overlap with.
When the cover sheet 3 is joined to the side sheets 24 and 25 by the first joining portion 51 and the second joining portion 52 having such a specific arrangement, when the above-mentioned displacement force is applied to the cover sheet 3. Since the front side portion of the second joint portion 52, which is the portion where stress is most likely to be concentrated, is not joined to the side sheets 24, 25, the stress applied to the front side portion is released (distributed to other portions), The cover sheet 3 can be made more difficult to tear, and the cover sheet 3 can be more steadily attached by the first joint portion 51 located on the outer side in the width direction than the second joint portion 52 described above. It can be fixed to 25. Accordingly, the urine absorbing pad 1 according to the present embodiment can stably exhibit the function of the cover sheet 3 described above for a longer period of time.

Furthermore, as shown in FIG. 2, each of the pair of side sheets 24, 25 described above and both end portions 21L, 21R in the width direction W of the topsheet 21 have the pair of lateral side joint portions 5, 5 described above. Are joined to the outer side in the width direction W by outer side joint portions 6L and 6R which are separated from each other by a predetermined distance.
As described above, the lateral side joints 5 and 5 which are joints between the pair of side sheets 24 and 25 and the cover sheet 3, and the joints between the pair of side sheets 24 and 25 and the top sheet 21. When the outer joint portions 6L and 6R are separated from each other, the separated portions 24D and 25D (that is, the outer joint portions 5 and 5 in the pair of side sheets 24 and 25 and the outer joint portions Due to the presence of the side joints 6L and 6R), the cover is secured while ensuring a region (that is, a movement allowance of the cover sheet) in which movement or extension of the cover sheet 3 in the longitudinal direction L is allowed. The seat 3 can be displaced so as to float up from the topsheet 21 when the pair of side seats 24, 25 stands up. As a result, the urine absorbing pad 1 according to the present embodiment is configured to apply the displacement force to the lateral side joint portions 5 and 5 of the pair of side sheets 24 and 25 and the outer side joint even when the displacement force is applied. While relaxing at the portions 24D and 25D between the portions 6L and 6R, the cover sheet 3 can be smoothly and reliably moved or extended in accordance with the movement of the buttocks of the wearer.

In addition, the width direction length and the arrangement interval of each of the above-described joints (that is, the first joint 51, the second joint 52, and the outer joints 6L and 6R) are not particularly limited unless the effects of the present invention are impaired. The length is not limited, and an arbitrary length (for example, a length within a range of 1 mm to 20 mm) and an arrangement interval (for example, an arrangement interval of the first joining portion and the second joining portion is 1 mm according to a desired joining strength or the like). It is within the range of 10 mm, and the arrangement interval of the lateral side joint portion and the outer side joint portion is within the range of 5 mm to 50 mm).

Further, in the present invention, the cover sheet may be directly fixed to a main part other than the above-mentioned side sheet instead of or in addition to the above-mentioned joining with the side sheet, unless the movement is restricted. That is, the cover sheet can be partially joined to various members constituting the main part so that the movement is not restricted. For example, the cover sheet may be bonded to the main part of the absorbent article (more specifically, the topsheet or the backsheet) so that the movement of the coversheet is not restricted and the coversheet is sufficiently bent to form a drape. it can.

For example, in the above-described embodiment, as shown in FIG. 4, the cover sheet 3 divides the rear side end 3E _B in the width direction W into three equal parts in the rear side end 3E _B extending in the width direction W. Has a width direction first region 3E _B1 , a width direction central region 3E _BC, and a width direction second region 3E _B2 , and the cover sheet 3 has a width direction central portion of the width direction central region 3E _BC (width direction central axis line). in portions) other than the portion of overlapping with C _L, it is joined to the topsheet 21. More specifically, the rear side end portion 3E _B of the cover sheet 3 is, as shown in FIG. 4, a rear side first joint extending from the width direction first region 3E _B1 to the width direction central region 3E _BC. While being joined to the skin-facing surface of the topsheet 21 via the portion 71 and the rear-side second joining portion 72 extending from the width-direction second area 3E _B2 to the width-direction central area 3E _BC , The portion including the widthwise central portion of the widthwise central region is not joined to the topsheet 21.

In the present invention, the joining form between the rear side end portion of the cover sheet and the topsheet is not limited to the aspect of the above-described embodiment, and for example, the cover sheet is the width direction first region of the rear side end portion and In each of the width-direction second regions, if a part or all of the width-direction second region is bonded to the skin-facing surface of the surface sheet, the width-direction central region is not bonded to the surface sheet or only a part thereof is bonded to the surface sheet. It may be done.

When the rear end portion of the cover sheet is joined to the surface sheet in such a specific form, while sufficiently securing the movement allowance of the cover sheet in the widthwise central region, the widthwise first region and In the second region in the width direction, the movement of the cover sheet can be restricted within a predetermined range so that the cover sheet does not excessively move or extend in the longitudinal direction. As a result, the absorbent article having such a configuration is less likely to form a difficult-to-restore state (for example, a state where wrinkles are strongly wrinkled) that may be caused by excessive movement or extension of the cover sheet, and the cover concerned The seat function can be exerted more reliably.

In addition, the size of each of the above-mentioned rear side joints (the rear side first joint and the rear side second joint) is not particularly limited, and for example, the longitudinal length of each rear side joint is in the range of 10 mm to 30 mm. And the length in the width direction is in the range of 5 mm to 40 mm.

In the present invention, each of the above-mentioned joints (that is, the side joints (first joints, second joints), the outer joints, the rear first joints, and the rear second joints) The joining method is not particularly limited as long as the effects of the present invention are not impaired, and any joining method using a hot melt adhesive or heat fusion can be adopted.

Further, in the above-described embodiment, the cover sheet 3 is provided in the rear region A _B of the urine absorbing pad 1 so as to correspond to the vicinity of the buttocks of the wearer (particularly near the sacrum) where skin diseases such as pressure sores and rashes are likely to occur. Although it is arranged only in the absorbent article of the present invention, the present invention is not limited to such arrangement, and the cover sheet is not limited to the posterior region, but also to the anterior region or the central region where the above-mentioned skin diseases may occur. It may also be arranged in some areas.

Further, in the above-described embodiment, the cover sheet 3, as shown in FIG. 1, the rear end portion 3E _B of the cover sheet 3 is disposed so as to extend to the rear side edge 1B of the urine absorbing pad 1 ing. Although arranging the cover sheet in this manner is not an indispensable constituent element in the absorbent article of the present invention, the cover sheet extends to a position as close to the rear side as possible of the absorbent article. It is preferable. When the cover sheet extends to such a position, the vicinity of the buttocks of the wearer who is likely to have a skin disease can be covered more widely, so that the skin disease described above can be made less likely to occur.

Further, the size of the cover sheet is not particularly limited as long as the effects of the present invention can be exhibited, and for example, the longitudinal length of the cover sheet is within the range of 25% to 100% of the longitudinal length of the rear region. , Preferably in the range of 30% to 80%, more preferably in the range of 40% to 70%. When the outer shape of the cover sheet is a shape other than a rectangular shape, the length in the longitudinal direction means the maximum length of the shape in the longitudinal direction. 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 80 mm to 200 mm, in consideration of the range of the site where skin diseases are likely to occur and the ease of leakage of excreted liquid. Within the range, and more preferably within the range from 100 mm to 180 mm. In addition, when the outer shape of the cover sheet is a shape other than a rectangular shape, the width-direction length means the maximum length in the width direction of the shape.

<Low friction member>
In the urine absorbing pad 1 according to the embodiment described above, the low-friction member 4, as shown in FIGS. 1 and 2, disposed between the topsheet 21 and the cover sheet 3 in the rear region A _B of the urine absorbing pad 1 It is formed of a low-friction sheet-like member that can reduce the frictional resistance with the cover sheet 3 arranged on the skin-facing surface side S ₁ .

The low-friction member 4 has a predetermined length in the longitudinal direction L of the urine absorbing pad 1 (for example, 100 mm to 200 mm) and a predetermined width direction W of the urine absorbing pad 1 in plan view. It has a substantially rectangular outer shape having a width direction length (for example, 50 mm to 150 mm). In the present invention, the external shape of the low-friction member is not limited to such an aspect, and any external shape (for example, a circular shape) can be used as long as it can reduce the frictional resistance between the low-friction member and the cover sheet. , Oval, polygonal, etc.) and sizes. Further, the low-friction member may be composed of one sheet-shaped member as in the above-described embodiment, or may be composed of a plurality of sheet-shaped members divided in the longitudinal direction and/or the width direction. Good. In this case, the plurality of sheet-shaped members forming the low-friction member are arranged at predetermined intervals in the longitudinal direction and/or the width direction, but the plurality of sheet-shaped members are arranged in this way. Thus, it becomes easier to secure 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 friction resistance with the above-mentioned cover sheet, and examples thereof include olefin resins such as polyethylene and polypropylene, and silicone resins. Sheet-like members made of resin having a low friction coefficient such as fluororesin such as polytetrafluoroethylene or a resin composition; general-purpose thermoplastic resin such as olefin resin such as polyethylene and polypropylene and polyester resin such as polyethylene terephthalate Alternatively, at least one surface of the base material 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 having a low friction coefficient such as silicone resin or fluororesin. It is possible to use a coated sheet-like member or the like.
In addition, in the present specification, the sheet-shaped member and the base material sheet are not only a sheet or a film having a thin and flat structure, but also a porous structure having a plurality of openings and an uneven structure having a plurality of protrusions and recesses. A sheet having a desired structure, such as a sheet; a fiber sheet such as a woven fabric, a non-woven fabric, or a knitted fabric; and a sheet-like structure in any form such as a laminated sheet obtained by arbitrarily combining these.

When the above resin sheet-shaped member is used as the low friction member, the resin sheet-shaped member preferably contains high density polyethylene (HDPE) in a proportion of 50 mass% or more, and high density polyethylene (HDPE) and It is more preferable that the low density polyethylene (LDPE) is contained in a mass ratio within 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 more due to the high-density polyethylene component, and has a low friction resistance. It can be a small member.
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, when the sheet-like member is formed from the resin material. Since the residual stress inside the sheet-shaped member (that is, the internal residual stress) can be reduced by the soft low-density polyethylene component, the sheet-shaped member (particularly the end portion in the width direction of the sheet-shaped member is ) Can be suppressed from being rounded (that is, curled) due to relaxation of the internal residual stress. Therefore, the absorbent article provided with such a resin sheet-like member as a low-friction member, the above-mentioned cover sheet, because it can move more smoothly on the low-friction member, to the wearer's skin. It is possible to make it more difficult to apply physical stimulation due to friction or shearing force.

In the present 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.

Further, when the above-mentioned coated sheet-like member is used as the low-friction member, the coated sheet-like member is formed 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 of solvent type, solventless type and emulsion type can be used. The curing mode is also not particularly limited, and either thermosetting or ultraviolet curable silicone resin can be used. However, when a plastic film composed 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. The coating method of the low friction material is not particularly limited, and any coating method such as a spray method, a roll method, a dip method can be adopted.

The low-friction member is not particularly limited in its structure as long as it has a low-friction property capable of reducing frictional resistance between the low-friction member and the cover sheet arranged on the skin-facing surface side, and the above-mentioned sheet-like member Although any structure other than the above (for example, at least one elongated rod-shaped member, at least one strip-shaped member, etc.) can be adopted, it is possible to secure a wide range of low friction regions and the surface of the low friction member. In consideration of the slipperiness of the cover sheet (the ease of movement in the plane direction), the flexibility of the absorbent article as a whole, etc., the sheet-like member having a substantially flat structure as in the above-described embodiment. Is preferably used.

Further, the sheet-shaped member that can be used as the low-friction member is not limited to the one that has a generally flat structure as in the above-described embodiment, and such a sheet-shaped member is, for example, in the width direction of the absorbent article. Both ends may be warped (that is, displaced) toward the skin facing surface side. When both ends in the width direction of the sheet-like member forming the low friction member are displaced toward the skin facing surface side, the ends displaced toward the skin facing surface side are the skin of the low friction member. By pressing the cover sheet located on the opposite surface side against the wearer's skin, the cover sheet can more accurately follow the movement of the wearer's skin.

In the present invention, the coefficient of static friction of the surface of the low friction member (at least the surface facing the skin) allows the cover sheet to move in the surface direction along with the wearer's skin in accordance with the wearer's movement. It is not particularly limited as long as it can ensure the degree of slipperiness, and is, for example, in the range of 0.04 to 0.80, preferably in the range of 0.10 to 0.50, and further preferably. It is within the range of 0.10 to 0.40. Similarly, the coefficient of kinetic friction of the surface of the low-friction member should also be such that the above-mentioned cover sheet can ensure slipperiness such that it can move in the surface direction along with the wearer's skin in accordance with the wearer's movement. If not particularly limited, for example, within the range of 0.10 to 0.75, preferably within the range of 0.10 to 0.55, and more preferably within the range of 0.10 to 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 static coefficient of friction and the dynamic coefficient of friction, a cotton cloth for friction "Korikin No. 3 (Kanakin No. 3)" specified in JIS L0803 is used as a test piece for a horizontal plate, and a low friction member is used as a weight test piece. ..

In the present invention, the low-friction member is arranged so as to completely overlap with 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 arranged 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, and air permeability. It is preferable that the cover sheet is arranged at a narrower position than the cover sheet. In that case, the low-friction member preferably has a planar view area of a certain level or less such that the low-friction member is not exposed even when the cover sheet moves in the surface direction. The plan view area is within a range of 10% to 80% of the plan view area of the cover sheet, preferably within a range of 20% to 60%, and more preferably within a range of 25% to 50%.

The position where the low-friction member is arranged is not particularly limited as long as it is a position overlapping the cover sheet in plan view, but it is preferably substantially the center of the cover sheet.
When the absorbent article has a fold line extending in the width direction for folding the expanded absorbent article in the longitudinal direction, the low-friction member has the above-mentioned folding line in plan view. It is preferably arranged at a position not overlapping the line. When the low-friction member is arranged at a position that does not overlap with such a fold line, the low-friction member does not have a crease that extends in the width direction, so that the cover sheet described above can be easily moved particularly in the longitudinal direction. While ensuring the above, the absorbent article can be stored in a package or the like in a compact state folded in the longitudinal direction.

The thickness of the low-friction member is not particularly limited as long as it does not impair the effects of the present invention, and may be any thickness (for example, a thickness within the range of 0.01 mm to 1.0 mm) in consideration of flexibility and strength. Can be adopted. The thickness of the low-friction member can be measured by using an arbitrary non-contact type measuring device such as a laser displacement meter, or by observing a cross section in an enlarged manner using a scanning electron microscope or the like. As the thickness of the low friction member, the average value of the measured values at arbitrary 5 different points is adopted in consideration of the influence of the measurement error and the like.

Furthermore, it is preferable that the low friction member described above is joined to the topsheet by any joining means such as a hot melt adhesive. This joining means may be applied continuously or intermittently in the longitudinal direction and/or the width direction of the absorbent article, but if the joining means is applied intermittently, breathability may be improved. It is easy to secure, and stuffiness in the absorbent article hardly occurs.

Further, when the above-mentioned low friction member has a plurality of openings penetrating in the thickness direction, the surface sheet and the low friction member have a low tack in which the measured value of the probe tack test is 0.78 N or less. It is preferable that they are at least partially bonded via a flexible adhesive. When the topsheet and the low-friction member having a plurality of openings are at least partially joined via such a low-tack adhesive, the low-tack adhesive opens the low-friction member. Since the low friction member can be fixed to the surface sheet while not being joined to the cover sheet located on the skin facing surface side through the holes, the cover can be prevented while suppressing the displacement and peeling of the low friction member. The seat can be moved more stably.
In addition, the measured value of the probe tack test can be measured using an arbitrary probe tack type test device (for example, tacking tester manufactured by RESCA CORPORATION).

In the absorbent article of the present invention, since it is not an essential constituent element to include the above-mentioned low friction member, when the movement or extension of the cover sheet is secured, the absorbent article of the present invention is provided. May not include the low friction member described above.

<Absorptive sheet>
In the urine absorption pad 1 according to the above-described embodiment, as shown in FIG. 1, the absorbent sheet 8 is located on the skin facing surface side S ₁ of the absorbent body 22 more than the longitudinal center axis C _W extending in the width direction W. and the front edge 3E _F of the rear side S located in _B and above of the cover sheet 3 is disposed so as to straddle the longitudinal direction L.

When the absorbent article further includes an absorbent sheet arranged at the above-mentioned specific position in addition to the absorbent body, even when the excretory liquid is repeatedly supplied from the wearer, the absorbent article is The excreted liquid flowing toward the rear side can be gradually absorbed by the absorber and the absorbent sheet. Thereby, in the absorbent article provided with such an absorbent sheet, it is possible to prevent the wearer's buttocks from being easily wetted by the excretory liquid and further prevent the strength of the cover sheet from being wetted by the excreted liquid.

In the above embodiment, the absorbent sheet 8, as shown in FIG. 1, in plan view, of a predetermined extending over the rear region A _B from the central region A _C of the urine absorbing pad 1 longitudinal length (For example, 100 mm to 200 mm) and a predetermined width direction length (for example, 100 mm to 200 mm) extending so as to cover most of the absorber 22 in the width direction W, and a substantially rectangular shape that is long in the longitudinal direction L. It has an outer shape. In the present invention, the outer shape of the absorbent sheet is not limited to such an aspect, and any outer shape (for example, circular, elliptical, polygonal, etc.) according to desired absorption performance and the like can be used. Can be adopted.

In the present invention, the absorbent sheet is not particularly limited as long as it is a sheet-shaped member containing a superabsorbent polymer, for example, a superabsorbent polymer such as sodium acrylate copolymer, a covering sheet such as a tissue having hydrophilicity. The one covered is mentioned. The absorbent sheet may contain the same absorbent material as the above-mentioned absorber, in addition to the superabsorbent polymer.

The basis weight and thickness of the absorbent sheet are not particularly limited as long as they do not impair the effects of the present invention, and any basis weight and thickness considering the desired absorption performance, flexibility, etc. can be adopted.

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 absorbing pad of the above-described embodiment. Further, the absorbent article of the present invention is not limited to the above-described embodiments and modifications thereof and the like, and can be appropriately combined, replaced, changed, etc. within the scope of the object and the spirit of the present invention. .. In this specification, the ordinal numbers such as “first” and “second” are for distinguishing the items to which the ordinal numbers are attached, and mean the order, priority, importance, etc. of each item. Not something to do.

1 Urine collection pad (absorbent article)
2 Main part 21 Topsheet 22 Absorber 23 Backsheet 24 Sidesheet (one side)
25 Side seat (other side)
26 Leak-Proof Sheet 27 Elastic Member 28 Leak-Proof Wall Part 3 Cover Sheet 31 Strength Retaining Part 32 Extension Area 32L End Side Extension Part (One Side)
32R End side extension (other side)
32C Inner side extension part 32A Convex strip part 32A ₁ 1st convex part 32A ₂ 2nd convex part 32B Recessed groove part 33L Side non-expansion area (one side)
33R Side non-stretching area (other side)
4 Low Friction Member 5 Side Joint 51 First Joint 52 Second Joint 6L Outside Joint (One Side)
6R Outer side joint (other side)
71 Rear-side 1st joint part 72 Rear-side 2nd joint part 8 Absorbent sheet A _F Front area _AC Central area A _B Rear area F _Z Shift force

Claims (10)

While having a longitudinal direction, a width direction and a thickness direction, in the longitudinal direction, a front region, a rear region, an absorbent article having a central region located between these regions,
The absorbent article has a main portion having a liquid-permeable top sheet, and a cover sheet that is located on the skin-facing surface side of the top sheet in at least the rear region and is partially joined to the main portion. And including,
The cover sheet may have at least the and having a longitudinally extendable extension region, one or more of the strength retaining portion extending in the longitudinal direction in the stretching region,
The main portion, on the non-skin-facing surface side of the topsheet, an absorber extending from the front region to the rear region, and on the skin-facing surface side of the absorber, the longitudinal center of the absorbent article. And an absorbent sheet that is located rearward of the longitudinal center axis extending in the width direction and that extends so as to straddle the front end edge in the longitudinal direction of the cover sheet in the longitudinal direction. The absorbent article further comprising: The cover sheet has a lateral side non-expandable region extending in the longitudinal direction at each of both ends in the width direction, and is joined to the main portion in the lateral side non-expandable region, Item 2. The absorbent article according to item 1. The extension region includes an end-side extension portion adjacent to the strength retaining portion and the width direction, at least one end portion of both end portions in the width direction,
The end portion side extension portion is a ridge portion projecting to the skin facing surface side in the thickness direction and continuously extending in the width direction, and a recess on the non-skin facing surface side in the thickness direction and in the width direction. The continuously extending concave groove portion has a concavo-convex structure arranged so as to be alternately repeated in the longitudinal direction,
Further, the ridge portion has a long width direction and is in contact with a width direction edge of the extension region, and a first ridge portion is short in the width direction and contacts the width direction edge of the extension region. Not having a second ridge,
The cover sheet is joined to the main portion in a region that overlaps with an end of the first ridge portion on the outer side in the width direction and does not overlap with the second ridge portion in a plan view. ,
The absorbent article according to claim 1 or 2. The said end part side extension part is arrange|positioned so that the said 1st convex line part and the said 2nd convex line part may repeat alternately in the said longitudinal direction via the said groove part. Absorbent article. The said strength holding|maintenance part is an absorbent article as described in any one of Claims 1-4 extended from the front side edge in the said longitudinal direction of the said extension area|region to the back side edge. The absorbent article further includes a low-friction member located between the surface sheet and the cover sheet in the thickness direction,
The cover sheet has a front-side non-expansion region that is located in front of a front-side end edge of the low-friction member in the longitudinal direction and extends in the width direction in a plan view. The absorbent article according to any one of 5 above. The absorbent article has a pair of side-side joining portions that overlap each other in the thickness direction with both end portions in the width direction of the cover sheet, and join the cover sheet and the main portion. Cage,
Further, each of the pair of lateral side joints is located on the outer side in the width direction and extends in the longitudinal direction, and is located on the inner side in the width direction and A second joint portion extending in the longitudinal direction,
The front edge of the first joint portion overlaps with the front edge of the cover sheet in the thickness direction, while the front edge of the second joint portion is the front edge of the cover sheet. The absorbent article according to any one of claims 1 to 6, which is located on the rear side of the absorbent article. The main portion further includes a pair of side sheets extending in the longitudinal direction at both ends in the width direction and positioned on the skin-facing surface side of the surface sheet,
Further, each of the pair of side sheets and both end portions in the width direction of the cover sheet are respectively joined by the pair of lateral side joining portions,
Both ends of each of the pair of side sheets and the top sheet in the width direction are respectively formed by outer side joint portions that are separated from the pair of side side joint portions by a predetermined distance to the outer side in the width direction. The absorbent article according to claim 7, which is joined. The cover sheet has a width-direction first region, a width-direction central region, and a width-direction second region that divide the rear-side end portion into three equal parts in the width direction at the rear-side end portion extending in the width direction. Then
The cover sheet is joined to the topsheet in the width-direction first region and the width-direction second region, while it is not joined to the topsheet in the width-direction central region or only a part thereof. The absorbent article according to any one of claims 1 to 8, wherein is bonded to the topsheet. The absorbent article has at least one fold line extending in the longitudinal direction for folding the absorbent article in the width direction, and the strength retaining portion overlaps with the fold line. Item 10. The absorbent article according to any one of items 1 to 9.

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