TWI769241B - absorbent articles - Google Patents

Abstract

The present invention is to provide an absorbent article which is less likely to cause discomfort to the wearer and less likely to cause skin diseases such as bedsores or the like, even when a deflection force is repeatedly applied for a long time. The absorbent article of the present invention comprises a main portion (2) of a liquid-permeable surface sheet (21), and a cover sheet (3), at least in a rear region (A _B ), a surface sheet (21) The cover sheet (3) is positioned on the skin-opposing surface side and is partially joined with respect to the main portion (2), and the cover sheet (3) has at least an elongated region (32) that can be stretched in the longitudinal direction, and has an elongated region (32) facing toward the side. One or a plurality of strength retaining parts (31) extending in the longitudinal direction.

Description

absorbent articles

The present invention relates to absorbent articles such as urine-absorbing pads and disposable diapers, and particularly to absorbent articles that are less likely to cause skin diseases such as bedsores and rashes on the wearer's skin.

In recent years, in absorbent articles such as urine-absorbing pads and disposable diapers, various measures for improving skin diseases such as bedsores and rashes (dermatitis) that occur on the wearer's skin have been discussed.

As such an absorbent article, for example, Patent Document 1 discloses a disposable urine-absorbing pad having a function of preventing bedsores, which includes an outer sheet and an absorber provided on the body side of the outer sheet. , the inner sheet provided on the body side of the absorbent body, the left sheet provided on the left side of the pad, the right sheet provided on the right side of the pad, the overlap sheet provided on the buttocks region, and the overlap In the low-friction member between the sheet and the inner sheet, the right side edge and the left side edge of the overlapping sheet are joined to the left side portion of the right side sheet and the right side portion of the left side sheet, respectively. The disposable urine-absorbing pad disclosed in Patent Document 1 has a function of preventing the occurrence and deterioration of bedsores because it can be manufactured inexpensively and the overlapping sheet is relatively easy to move in the front-rear direction with respect to the inner sheet. Furthermore, this patent document 1 also discloses a sheet that can expand and contract at least in the front-rear direction of the urine-absorbing pad, with regard to the above-mentioned overlapping sheet. When the wearer's buttocks are displaced forward during use, the overlapping sheets can move together with the buttocks, so that the occurrence and deterioration of bedsores can be prevented. [Prior Art Literature] [Patent Literature]

[Patent Document 1] Japanese Patent Laid-Open No. 2014-155609

[The problem to be solved by the invention]

However, absorbent articles such as urine-absorbing pads are used by users for a long period of time because they respond to various changes in the wearer's body position, such as when raising the bed, when using a wheelchair, and when turning over during bedtime. Therefore, as in the urine-absorbing pad disclosed in Patent Document 1, only a stretchable sheet is used as the overlapping sheet (cover sheet), and the wearer's buttocks are displaced in the front-rear direction due to the above-mentioned change in the wearer's body position. When the situation of movement occurs repeatedly, in the state where the wearer's body pressure is applied, a force (bias force) is applied toward the rear side in the longitudinal direction of the absorbent article, except for the stretchable part of the cover sheet ( Generally, a part having such stretchability is provided with a stretchable structure to reduce the strength.) A plurality of wrinkles are gathered and the state of shrinking in the longitudinal direction is not included, because the state of the offset is repeatedly applied. Therefore, the expected function of the cover sheet (that is, the so-called cover sheet moves in accordance with the movement of the wearer's buttocks, and does not easily give friction to the wearer's skin, The function of physical stimulation due to offset force) cannot be fully exerted, and as a result, the wearer may feel uncomfortable, or the skin of the wearer's buttocks (specifically, near the sacrum) may cause pressure sores or the like. Concerns about the occurrence and progression of disease.

Therefore, an object of the present invention is to provide an absorptive property that is less likely to cause discomfort to the wearer, and less likely to cause skin diseases such as bedsores and deterioration even when a deflection force is repeatedly applied for a long time. thing. [Means for solving problems]

One aspect of the present invention (Aspect 1) has: a longitudinal direction, a widthwise direction, and a thickness direction, and, in the longitudinal direction, has a front region, a rear region, and a region located between the two regions The absorbent article in the central area between the two is characterized in that: the absorbent article includes: a main part of a liquid-permeable surface sheet, and a cover sheet, which at least in the rear region, is positioned more towards the skin than the surface sheet. The cover sheet has at least an elongation region that can be stretched in the longitudinal direction, and has one or a plurality of strength maintaining areas extending in the longitudinal direction in the elongated region. department.

The absorbent article of this aspect 1 has one or a plurality of strength-retaining portions extending in the longitudinal direction in the stretched region of the cover sheet, and therefore, when a deflection force in the longitudinal direction is applied to the absorbent article, the cover sheet In addition to the fact that the stretched region of the cover sheet is not easily formed into a state of shrinking in the longitudinal direction due to the accumulation of plural wrinkles, it is assumed that the stretched region of the cover sheet temporarily shrinks in the longitudinal direction due to the repeated application of offset force for a long time. Due to the strength (rigidity) of the strength holding portion, it is easy to return to the original state. Therefore, in the absorbent article of this aspect, when the deflection force is applied in a single shot, even if the deflection force is repeatedly applied for a long time, the expected function of the cover sheet (that is, the so-called cover sheet) can be fully exhibited. The sheet moves and stretches in accordance with the movement of the wearer's buttocks, and it is difficult to impart the function of physical stimulation due to friction and offset force to the wearer's skin). It is also less likely to cause the occurrence and deterioration of skin diseases such as bedsores.

In addition, in this specification, the "excretory fluid" that is absorbed by the absorbent article is not particularly limited as long as it can be absorbed and retained by the absorber described later, for example, except for liquid substances such as urine, sweat, and blood. , and also includes low-viscosity substances such as soft stools.

Moreover, in another aspect (Aspect 2) of the present invention, in the absorbent article of the above-mentioned aspect 1, the cover sheet has a sheet extending in the longitudinal direction at each of both ends in the width direction. The lateral side non-stretch region is joined to the main portion in the lateral side non-stretch region.

The absorbent article of this aspect 2 is the peripheral portion of the joint portion between the cover sheet and the main part where stress tends to concentrate when a deflection force is applied in the longitudinal direction, and a certain strength can be ensured by forming the cover sheet by the non-stretched region, Therefore, even when the deflection force is repeatedly applied for a long time, the cover sheet is less likely to be cracked, and the above-mentioned function of the cover sheet can be more stably exhibited. As a result, the absorbent article of this aspect can achieve the above-mentioned effects more stably for a longer period of time (that is, the so-called uncomfortable feeling of the wearer is less likely to occur, and the occurrence and deterioration of skin diseases such as bedsores are also prevented. less likely to cause effects).

Moreover, in another aspect (aspect 3) of the present invention, in the absorbent article of the above aspect 1 or 2, the stretched region is an end included in at least one of the both ends in the width direction. part, an end side extension part adjacent to the strength maintaining part in the width direction, and the end side extension part has a protruding part in the thickness direction toward the skin-opposing surface side and extending continuously in the width direction. Concave-convex structure in which convex stripes and concave grooves are concave toward the non-skin-opposing surface side in the thickness direction and continuously extend in the width direction, and are alternately and repeatedly arranged in the longitudinal direction, and the The ridge portion includes a first ridge portion having a long width in the width direction and contacting the end edge in the width direction of the elongated region, and a first ridge portion having a short length in the width direction and not contacting the end edge in the width direction of the elongate region. The second ridge portion, the cover sheet, is joined in a region that overlaps with the end portion on the outer side in the width direction of the first ridge portion and does not overlap with the second ridge portion in plan view. in the aforementioned main section.

In the absorbent article of this aspect 3, the stretched region of the cover sheet has the above-mentioned specific uneven structure, and the cover sheet includes a part of the above-mentioned specific uneven structure (that is, the outer side in the width direction of the first ridge portion) The specific area of the side edge) is joined to the main part, so, by the above-mentioned first ridge part, the extension area of the cover sheet is ensured as wide as possible in the width direction, and also by the above-mentioned second ridge part. When the offset force is applied to the longitudinal direction of the absorbent article in the portion between the end portion on the outer side in the width direction of the absorbent article and the joint portion (the non-shaped portion to be described later), the stress is easily concentrated between the cover sheet and the junction portion. Since the peripheral part of the joint part of the main part has a certain strength, even if the deflection force is repeatedly applied for a long time, the cover sheet is not easily cracked, and the above-mentioned function of the cover sheet can be more reliably and stably exhibited. .

In yet another aspect (Aspect 4) of the present invention, in the absorbent article of the above-mentioned aspect 3, the end side extension portion is formed by the first ridge portion and the second ridge portion interposed therebetween. The grooves are arranged alternately and repeatedly in the longitudinal direction.

In the absorbent article of this aspect 4, in the end-side extension portion of the above-mentioned cover sheet, the first ridge portion and the second ridge portion are alternately and repeatedly arranged in the longitudinal direction with the grooves interposed therebetween. 2. The portion between the end portion on the outer side in the width direction of the ridge portion and the joint portion (that is, when the offset force is applied in the longitudinal direction of the absorbent article, the portion between the cover sheet and the main portion where stress is likely to be concentrated. The peripheral portion of the joint portion, the portion that can ensure a certain strength) is formed along the longitudinal direction of the cover sheet at regular intervals, and can be further stably secured against the above-mentioned displacement along the longitudinal direction of the cover sheet. strength of force.

In yet another aspect (Aspect 5) of the present invention, in the absorbent article according to any one of the above-mentioned aspects 1 to 4, the strength-retaining portion is formed from the longitudinal direction of the elongated region. The front side edge to the rear side edge is extended.

In the absorbent article of this aspect 5, since the strength-retaining portion of the cover sheet extends from the front end edge to the rear end edge in the longitudinal direction of the stretched region, it can cover the entire length of the stretched region in the longitudinal direction. The function of the above-mentioned strength retaining portion is exerted (that is, when the absorbent article is applied with a biasing force in the longitudinal direction, it is difficult for the stretched region of the cover sheet to be in a state where a plurality of wrinkles gather and contract in the longitudinal direction. A function of easily returning to the original state even when the stretched region of the cover sheet is in a state of shrinking in the longitudinal direction described above by repeatedly applying an offset force for a long period of time).

Still another aspect (Aspect 6) of the present invention is the absorbent article according to any one of the above-mentioned aspects 1 to 5, wherein the absorbent article further includes a surface located in the thickness direction of the absorbent article. A low-friction member between a sheet and the cover sheet, wherein the cover sheet has a front side edge in the longitudinal direction of the low-friction member in a plan view, and extends in the width direction. Front side non-elongation area.

Since the absorbent article of this aspect 6 further includes a low-friction member located between the top sheet and the cover sheet (that is, on the non-skin-opposing surface side of the cover sheet), the low-friction member is interposed therebetween. The frictional resistance between the cover sheet and the surface sheet is reduced, and the cover sheet moves and stretches more smoothly in accordance with the movement of the wearer's buttocks. Furthermore, the absorbent article of this aspect has a non-stretchable region (front-side non-stretchable region) extending in the width direction in the portion on the front side of the portion where the cover sheet and the low-friction member overlap in the thickness direction. ), the front portion of the cover sheet can secure a certain strength against the above-mentioned deflection force, and the cover sheet is further less likely to shrink in the longitudinal direction or tear as described above.

Yet another aspect (aspect 7) of the present invention is the absorbent article according to any one of the above-mentioned aspects 1 to 6, wherein the absorbent article has two of the above-mentioned width directions of the cover sheet. Each of the end portions overlaps in the thickness direction, and joins the cover sheet and the main portion of a pair of lateral-side joint portions, and each of the pair of lateral-side joint portions has: A first junction portion extending in the longitudinal direction on the outer side in the widthwise direction, and a second junction portion located on the inner side in the widthwise direction and extending in the longitudinal direction, the first junction portion extending in the longitudinal direction. 1. The front end edge of the joint portion is the one that overlaps with the front end edge of the cover sheet in the thickness direction, and the front end edge of the second joint portion is located more rearward than the front end edge of the cover sheet. .

In the absorbent article of this aspect 7, since the cover sheet is joined to the main part by the pair of lateral side joining parts of the above-mentioned specific form, the cover sheet is not joined to the main part to increase the absorbency. When an offset force is applied in the longitudinal direction of the article, the front part of the second joint part, which is the part where the stress is most likely to concentrate, can go further by allowing the stress applied to the front part to escape (distribute to other parts). The cover sheet is not easily torn, and the cover sheet can be more securely fixed to the main portion by the first joint portion located on the outer side in the width direction than the above-described second joint portion. Thereby, the absorbent article of this aspect can stably exhibit the above-mentioned function of the cover sheet for a longer period of time.

In yet another aspect (Aspect 8) of the present invention, in the absorbent article of the above-mentioned aspect 7, the main portion further includes extending in the longitudinal direction at both ends in the width direction, and A pair of side sheets located on the skin-opposing surface side of the top sheet, and further, each of the pair of side sheets and both ends in the width direction of the cover sheet are formed by the pair of side sheets. On the other hand, each of the pair of side sheets and the both ends of the cover sheet in the width direction are respectively joined by the outer side joining portions separated by a predetermined distance. It is joined to the outer side of the said width direction rather than the said pair of side side joining parts, respectively.

In the absorbent article of this aspect 8, each of the pair of side sheets is joined to the cover sheet and the top sheet, and since the side-side joining portion, which is the joining portion of the pair of side sheets and the cover sheet, and the side sheet as a The outer side joints of the joints between the pair of side sheets and the surface sheet are separated from each other, so by the existence of the separated part (that is, the part between the side side joint and the outer side joint) , while securing an area that allows the movement and elongation of the cover sheet in the longitudinal direction (hereinafter, there is a case called "movability of the cover sheet"). The surface flakes are lifted and displaced. Thereby, even when the above-mentioned deflection force is applied in the absorbent article of this aspect, the deflection is alleviated in the portion between the side-side joining portion and the outer-side joining portion of the pair of side sheets described above. The shifting force allows the covering sheet to move and stretch smoothly and surely in accordance with the movements of the wearer's buttocks.

Still another aspect (Aspect 9) of the present invention is the absorbent article according to any one of the above-mentioned aspects 1 to 8, wherein the cover sheet is a rear side end extending in the width direction. The part has a first region in the widthwise direction, a central region in the widthwise direction, and a second region in the widthwise direction that divide the rear side end portion into three equal parts in the widthwise direction. The first region and the second region in the widthwise direction are bonded to one of the topsheets, and the central region in the widthwise direction is not bonded to the topsheet or is only partially bonded to the topsheet.

In the absorbent article of this aspect 9, since the rear side end of the cover sheet is joined to the top sheet in the above-mentioned specific form, the mobility of the cover sheet can be sufficiently ensured in the above-mentioned central area in the width direction, and the The first region in the widthwise direction and the second region in the widthwise direction can restrict the movement of the cover sheet within a predetermined range, so that the cover sheet does not move or stretch excessively in the longitudinal direction. Therefore, the absorbent article of this aspect is less likely to be in a state that may be difficult to restore due to excessive movement and elongation of the cover sheet (for example, a state where wrinkles are strongly gathered, etc.), and the function of the cover sheet can be more reliably exerted.

Yet another aspect (aspect 10) of the present invention is the absorbent article of any one of the above aspects 1 to 9, wherein the absorbent article has at least one absorbent folded in the width direction. In the folding line for articles extending in the longitudinal direction, the strength retaining portion overlaps the folding line.

In the absorbent article of the present aspect 10, since the strength retaining portion of the cover sheet overlaps with the folding line for folding the absorbent article in the width direction, the above-mentioned strength retaining portion is provided with a habit of folding extending in the longitudinal direction, so that it is possible to The cover sheet is further less likely to be in a state where wrinkles are gathered.

In yet another aspect (aspect 11) of the present invention, in the absorbent article of any one of the above-mentioned aspects 1 to 10, the main part further includes an absorber, which is formed on the non-contact surface of the top sheet. a skin-opposing surface side extending from the front region to the rear region; and an absorbent sheet located at the center of the absorbent article in the longitudinal direction of the absorbent article on the skin-opposing surface side of the absorber The central axis in the longitudinal direction extending in the widthwise direction is located more rearward, and extends in the longitudinal direction across the front end edge in the longitudinal direction of the cover sheet.

The absorbent article of the present aspect 11 further includes the absorbent sheet arranged at the above-mentioned specific position in addition to the absorber, so even when excretory fluid is repeatedly supplied from the wearer, the The absorber and the absorptive sheet absorb the excretion fluid that flows toward the rear side in the longitudinal direction of the absorbent article in stages. Thereby, in the absorbent article of this aspect, the wearer's buttocks are not easily wetted by excretory fluid, and furthermore, the strength of the cover sheet can be prevented from being wetted by excretory fluid, and the above-mentioned performance can be exhibited for a longer period of time. effect. [Effect of invention]

According to the present invention, it is possible to provide an absorbent article that is less likely to cause discomfort to the wearer and less likely to cause skin diseases such as bedsores and other skin diseases, even when a deflection force is repeatedly applied for a long time.

Hereinafter, suitable embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings. In addition, in this specification, if there is no particular emphasis, it is only placed in the expanded state as viewed from the upper side in the vertical direction (the top sheet side when the object is an absorbent article) in the thickness direction of the object. An object on a horizontal plane (for example, an absorbent article, a surface sheet, a cover sheet, an absorber, a low-friction member, etc.)" is referred to as a "plan view".

The various directions etc. used in this specification are as follows unless particular attention is paid. In this specification, the "longitudinal direction" refers to the "longitudinal direction of a vertically long object (for example, an absorbent article, an absorbent body, etc.) in plan view", and the "widthwise direction" refers to " The direction in which the length of a vertically long object in plan view is short (short-side direction)" and "thickness direction" refer to "the vertical direction with respect to the object placed on the horizontal plane in the unfolded state", such as The longitudinal direction, the width direction and the thickness direction of each are orthogonal to each other. In addition, in this specification, the "plane direction" refers to "the direction in which the plane of a substantially sheet-like object (for example, an absorbent article, a surface sheet, an absorber, a low-friction member, a cover sheet, etc.) in plan view extends ( That is, the horizontal plane direction)", the plane direction and the thickness direction are orthogonal to each other. Furthermore, in the present specification, "the longitudinal direction of a vertically long object is located at the center of the longitudinal direction of the object and is relative to the longitudinal center axis _CW extending in the width direction. The opposite proximal side" 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 the vertically long object, relative to the aforementioned longitudinal direction central axis _CW " The opposite distal side" is referred to as "longitudinal outer side" or "longitudinal outer side". Similarly, "in the widthwise direction of a vertically long object, it is located at the center of the widthwise direction of the object, and is on the opposite proximal side with respect to the widthwise central axis _CL extending in the longitudinal direction." It is called "the inner side in the transverse direction" or "the inner side in the transverse direction", and refers to "the opposite distal side of the transverse direction central axis _CL of the longitudinally long object in the transverse direction." ” is referred to as the “outside side in the widthwise direction” or the “outside side in the widthwise direction”. In addition, unless there is any particular emphasis in this specification, in the thickness direction of the absorbent article, "the proximal side opposite to the skin surface of the wearer at the time of wearing the absorbent article" is referred to as "skin facing" The "face side", and "the distal side opposite to the skin surface of the wearer when the absorbent article is worn" is referred to as the "non-skin opposing surface side". Here, "wearing" refers to the period (wearing period) during which the state is maintained from the point of time when the absorbent article is worn by the wearer (that is, the point of time when the absorbent article is in a usable state). In addition, in this specification, various members (for example, a surface sheet, an absorber, a low-friction member, a cover sheet, etc.) that will constitute the "skin-opposing surface side surface" and "non-skin-opposing surface side" are included. The case of "surface" is only referred to as "skin-opposed surface" and "non-skin-opposed surface", respectively.

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

As shown in FIG. 1 , the urine absorbing pad 1 according to one embodiment of the present invention has a longitudinally long outer shape in plan view, and the longitudinally long outer shape has a longitudinal direction L and a widthwise direction W, and further has a longitudinal A substantially hourglass-shaped outer shape in which a substantially central portion in the side direction L is narrowed toward the inward side of the width direction W. In addition, in the present invention, the external shape of the absorbent article is not limited to such a shape, and as long as the length in the longitudinal direction L is longer than the width in the width direction W, any shape corresponding to various applications can be adopted. Shape (eg, rectangle, oval, gourd, etc.).

As shown in FIG. 1 , the urine-absorbing pad 1 of the present embodiment has, in the longitudinal direction _L , a front area AF corresponding to the abdomen (more specifically, the lower abdomen) of the wearer when worn, and a A central area A _C corresponding to the wearer's crotch (more specifically, the crotch) when in use, and a rear area A _B corresponding to the wearer's back (more specifically, the buttocks) when worn of this order. In addition, in this specification, in the longitudinal direction of the absorbent article, "the proximal side opposite to the abdomen of the wearer when the absorbent article is worn" is referred to as the "front side", and the "absorbent article" is referred to as the "front side". The proximal side opposite to the wearer's back when worn" is referred to as the "rear side".

As shown in FIGS. 2 and 3 , the urine-absorbing pad 1 includes, in the thickness direction T, a main portion 2 including a liquid-permeable pad ₁ located on the skin-opposing surface side S1 of the urine-absorbing pad 1 . The top sheet 21, the liquid _- absorbent absorber 22 located on the non-skin-opposing surface side S2 of the topsheet ₂₁ , the back sheet 23 located on the non-skin-opposing surface side S2 of the absorber 22, Both ends of the widthwise direction W of the urinal pad ₁ are a pair of side sheets on the skin-opposing surface side S1 of the topsheet 21 (specifically, are arranged on the side of the end portion on one side of the widthwise direction W The sheet 24 and the side sheet 25 arranged at the end on the other side in the widthwise direction W, and the liquid-impermeable leak-proof sheet 26 positioned between the absorber 22 and the back sheet 23; in the rear area _AB The sheet-like low-friction member 4 located on the skin-opposing surface side S1 _of the topsheet 21; the cover sheet ₃ located on the skin-opposing surface side S1 of the low-friction member ₄ in the rear region AB; the absorber 22 The skin-opposing surface side S1 _of the skin-opposing surface side S1 is located on the rear side _SB from the longitudinal center axis _CW , and the absorbent sheet 8 extends in the longitudinal direction _L across the front side edge 3EF of the cover sheet 3 . In addition, the above-mentioned pair of side sheets 24 and 25 are, as shown in FIGS. 1 and 2 , when the urine-absorbing pad 1 is worn, each end (also known as the inner side in the width direction W) of the urine-absorbing pad 1 is That is, the widthwise inward side end portion 24R of the side sheet 24 and the widthwise direction inner side end portion 25L of the side sheet 25) stand by the contraction of the elastic member 27 provided at the end portion such as wire rubber or the like. Thus, the leak-proof wall portion 28 for preventing leakage of excretion fluid such as urine can be formed.

The urine-absorbing pad 1 of the present embodiment includes: the back area A _B of the buttocks of the wearer who are prone to skin diseases such as bedsores and rashes, including: on the skin-opposing surface side S1 _of the topsheet 21 The low-friction member 4, and the cover sheet 3 that is positioned on the skin-opposing surface side of the low-friction member 4 and is partially joined to the main portion 2, and the cover sheet 3 is, as shown in FIG. Both end portions 3E _L and 3E _R in the side direction W are respectively joined to the pair of side sheets 24 and 25 of the above-mentioned main portion 2 . and the skin-opposing surface of the low-friction member 4 so as to be floated and separated. As a result, in the urine-absorbing pad 1, the friction resistance between the cover sheet 3 and the top sheet 21 is reduced by the interposition of the low-friction member 4 and the floating of the cover sheet 3, so that the cover sheet 3 is relatively 21 becomes relatively easy to move in the face direction.

Furthermore, in the present embodiment, the cover sheet 3 has, as shown in FIGS. 1 , 2 , and 4 to 7 , an elongated region 32 that can be stretched in the longitudinal direction L, and the elongated region 32 has an elongated region 32 in the longitudinal direction. L extends the plurality of strength retaining portions 31 that exist. Further, in the present embodiment, as shown in FIG. 4 , there are seven strength maintaining portions 31 extending in the longitudinal direction L and arranged at predetermined intervals in the widthwise direction W. As shown in FIG. In addition, the elongation region 32 protrudes toward the skin-opposing surface side S1 in the thickness direction T of the urine-absorbing pad ₁ , and extends continuously in the direction along the widthwise direction W of the urine-absorbing pad 1, as will be described later. The ridge portion 32A of the urine absorbent pad 1 is recessed toward the non-skin-opposing surface side S ₂ in the thickness direction T of the urine absorbent pad 1 , and the groove portion continuously extends in the direction of the width direction W of the urine absorbent pad 1 32B includes an elongated portion having a concavo-convex structure that is repeatedly arranged along the longitudinal direction L of the urine-absorbing pad 1, and the concavo-convex structure of such an elongated portion is formed by gears in the nonwoven fabric used as the base material of the cover sheet 3. formed, therefore, the relative strength becomes low. On the other hand, since the strength retaining portion 31 is compressed in the thickness direction T or is not subjected to gear forming processing or the like, it has a strength (rigidity) higher than the strength of the nonwoven fabric serving as the base material covering the sheet 3, and is more elongated than the aforementioned The part is more relatively strong. Here, FIG. 9( a ) is an explanatory diagram schematically showing a state after the wearer (not shown) wears the urine-absorbing pad 1 of the present embodiment (the state in which the deflection force F _Z is not applied), and FIG. 9(b) is an explanatory diagram schematically showing a state in which a deflection force F _Z is applied to the urine absorbing pad 1 from the state.

As described above, since the urine-absorbing pad 1 of the present embodiment has the stretched region 32 in which the cover sheet 3 can be stretched in the longitudinal direction L, the stretched region 32 can be accurately adhered to the shape (body shape) of the wearer's skin surface. . In this way, the urine absorbing pad 1 can precisely face the face of the wearer together with the wearer's skin because the above-mentioned cover sheet 3 matches the movement of the wearer's buttocks even when the wearer moves during wearing. Since it moves and stretches in the direction, it becomes difficult to impart physical stimulation due to friction, offset force, etc. with respect to the skin of the wearer. In addition, since this urine absorbent pad 1 has the strength holding portion 31 extending in the longitudinal direction L in the extension region 32 of the cover sheet 3, when the urine absorbent pad 1 applies a biasing force in the longitudinal direction L In addition to the fact that the stretched region 32 of the cover sheet 3 is not likely to be in a state of shrinking in the longitudinal direction _L due to the accumulation of a plurality of wrinkles WR as shown in FIG. Even when the stretched region 32 of the cover sheet 3 is in a state of shrinking in the longitudinal direction L described above by repeated application for a long time, it can be easily restored to the original state shown in FIG. 9( a ). Thereby, the urine-absorbing pad 1 can fully exhibit the expected function of the above-mentioned cover sheet 3 (that is, the so-called cover sheet 3 is performed in accordance with the movement of the wearer's buttocks) even if the deflection force is repeatedly applied for a long time. It moves and stretches the wearer's skin and does not easily cause physical stimulation due to friction and offset force), and as a result, it is not easy to cause discomfort to the wearer, and it is not easy to cause skin diseases such as bedsores. ,deterioration.

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

<Main part> In the urine-absorbing pad 1 of the above-described embodiment, the main part 2 is, as shown in FIGS. 1 to 3 , including the liquid permeation on the skin-opposing surface side S1 of the urine-absorbing pad ₁ . a liquid _- absorbent absorber 22 located on the non-skin-opposing surface side S2 of the topsheet ₂₁ , and a back sheet 23 located on the non-skin-opposing surface side S2 of the absorber 22; _A pair of side sheets 24 and 25 on the skin-opposing surface side S1 of the top sheet 21 at both ends in the width direction W of the urine-absorbing pad 1 ; The liquid-impermeable leak-proof sheet 26 serves as the basic structure.

Here, in this specification, "both ends in the widthwise direction" means "the ends on one side and the other in the widthwise direction of an object (for example, an absorbent article, a main portion, a cover sheet, etc.) "The end of the lateral direction", and "the end of the widthwise direction" means "the end edge in the widthwise direction of the object (the edge on the outermost side in the widthwise direction), and from the end A portion of a predetermined range where the edge extends inward in the widthwise direction (that is, the portion where the widthwise direction length is within 15% of the total widthwise direction length)." In addition, the same applies to the ends in other directions (for example, the ends in the longitudinal direction, etc.).

In addition, the above-mentioned main part is a part which maintains the basic function (namely, absorption performance etc.) of an absorbent article, and the constituent element differs according to the kind of absorbent article. Therefore, for example, when the surface sheet has a predetermined absorption performance, the main part may not contain an absorber, and in the case of guaranteeing leakage resistance, the main part may not contain a side sheet.

Next, in this invention, various members which can comprise the main part of an absorbent article are demonstrated in detail.

[Top Sheet] In the urine-absorbing pad 1 of the above-described embodiment, the top sheet 21 is arranged in the thickness direction T except for the portion where the cover sheet 3 and the low-friction member 4 overlap in the thickness direction T as shown in FIGS. 1 to 3 . The position where the wearer's skin can immediately come into contact (that is, the position on the skin-opposing surface side S1 of the urine-absorbing pad ₁ ), and is composed of a liquid-permeable sheet that is permeable to excretions discharged from the wearer .

As shown in FIGS. 1 to 3 , the top sheet 21 covers the substantially entire length direction L and the width direction of the absorber 22 arranged on the non-skin-opposing surface side S ₂ of the top sheet 21 in plan view. W extends and has a substantially rectangular outer shape that is elongated in the direction along the longitudinal direction L of the urine absorbing pad 1 . Moreover, in the absorbent article of the present invention, the outer shape of the surface sheet is not limited to such a form, and as long as the surface on the skin-opposing surface side of the absorbent body is covered without protruding at least in the central region, any shape corresponding to various applications and the like can be adopted. Any shape and size.

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 a predetermined liquid permeability, skin feel, and the like. Arbitrary nonwovens such as spunbond nonwovens, hot air nonwovens, SMS nonwovens, etc., formed of resin fibers and the like.

In addition, the basis weight and thickness of the liquid-permeable sheet (non-woven fabric, etc.) that can be used as the surface sheet are not particularly limited as long as the effects of the present invention are not hindered, and may be adopted in consideration of desired liquid permeability, skin feel, etc. However, it is preferable to use a relatively thick liquid-permeable sheet for the surface sheet from the viewpoint that the return of the excretory fluid is less likely to occur, and the like.

Further, in the present invention, the structure of the surface sheet is not particularly limited as long as it has predetermined liquid permeability, skin feel, etc. Even if a general non-woven fabric has a substantially flat structure, although it has a ridge and groove structure, etc. It is also possible to have a concave-convex structure with a ridged structure, but it is preferable to use a surface sheet with a concave-convex structure such as a ridge groove structure from the point that the occurrence and deterioration of skin diseases such as bedsores are less likely to occur. Such a concavo-convex structure includes, for example, a ridge that protrudes toward the skin-opposing surface side in the thickness direction of the absorbent article and extends continuously in the direction along the longitudinal direction of the absorbent article, and a The thickness direction of the absorbent article is recessed toward the non-skin-opposing surface side, and the grooves extending continuously in the direction along the longitudinal direction of the absorbent article are alternately and repeatedly arranged along the widthwise direction of the absorbent article. ridge structure, etc. If the top sheet has such a concavo-convex structure, the contact area between the top sheet, the wearer's skin, and the cover sheet can be reduced, so that the cover sheet can be easily moved and stretched, and furthermore, the absorption by the absorber is less likely to occur. The excretory fluid and its moisture come into contact with the wearer's skin, and the wearer feels a wet state, a stuffy state, or the wearer's skin is in a wet state.

In addition, the extending direction of the ridge portion and the groove portion in the above-described ridge and groove structure is not particularly limited, and the ridge portion and the groove portion may extend in 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 may have a hollow internal structure (that is, the cross-sectional structure along the direction perpendicular to the extending direction of the ridge is a substantially corrugated structure), Also available with solid internal construction.

The method for imparting the above-mentioned concavo-convex structure to the surface sheet is not particularly limited, and for example, a method of continuously blowing gas (for example, air, etc.) to the fiber web, a compression forming method, a gear calendering method, and other forming methods can be used. .

Furthermore, in the present invention, the top sheet may be joined to the non-skin-opposing surfaces of the pair of side sheets positioned on the skin-opposing surface side, or may be joined to the skin-opposing surface or the non-skin-opposing surface of the absorber, It can also be bonded to the skin-opposing surface of the leak-proof sheet or the inner sheet. In addition, the joining method is not particularly limited either, and any joining means such as hot melt adhesive and hot melt can be used.

[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 of the above-described embodiment, the absorber 22 is constituted by an absorbent member as shown in FIGS. Between the back sheet 23 (more specifically, the leak-proof sheet 26 ), the excretory fluid of the wearer passing through the top sheet 21 is absorbed and held.

As shown in FIG. 1 , the absorber 22 spans from the front region _AF (specifically, the vicinity of the front side end edge 1A in the longitudinal direction L) of the urine absorbing pad 1 across the rear region _AB (specifically, in a plan view) as shown in FIG. 1 . In other words, it extends from the vicinity of the rear side edge 1B in the longitudinal direction L, and extends from the vicinity of one side edge in the width direction W in the urine absorbing pad 1 to the vicinity of the other side edge in the width direction W in the urine absorbing pad 1 It extends and is formed long in the direction along the longitudinal direction L of the urine absorbing pad 1, and has a substantially hourglass in which the substantially central portion in the longitudinal direction L narrows toward the inward side in the width direction W shape shape. In addition, in this invention, the external shape of an absorber is not limited to such a form, As long as a predetermined absorption performance can be exhibited, it also has arbitrary external shapes, such as a rectangular shape and an oval shape.

Moreover, about the position where the absorber is arranged in a plan view, it is only necessary to include the absorbent article including the intersection of the widthwise central axis CL extending in the longitudinal direction _L and the longitudinal central axis CW extending in the widthwise direction _W The position of the central portion of the absorbent article is not particularly limited, and for example, the absorber may be disposed on the other side of the longitudinal direction in the absorbent article.

In the present invention, the absorbent member usable as the absorber is not particularly limited as long as it can absorb and retain excretion fluid such as urine, and any absorbent member known in the art can be used. As an example of such an absorptive member, the absorption core which consists of an absorptive material mentioned later etc. is covered with the core wrap sheet, such as a hydrophilic tissue paper. Here, the absorbent material constituting the absorbent core includes, for example, hydrophilic fibers, superabsorbent polymers, and the like, and more specifically, cellulose-based fibers such as ground pulp, cotton, rayon, and acetate. Fibers; particulates formed from superabsorbent polymers such as sodium acrylate copolymers; and mixtures of arbitrary combinations of these, and the like.

Further, in the present invention, the absorber may be constituted by an absorptive member of a multilayer structure in which two or more absorption layers are laminated in the thickness direction. In this case, each absorption layer may be composed of an absorptive member of the same composition, or may be composed of an absorptive member of a different composition. In addition, the outer shape (shape in plan view) and dimensions of the respective absorption layers may be the same or different from each other.

In addition, the basis weight and thickness of the entire absorber are not particularly limited unless the effects of the present invention are inhibited, and any basis weight and thickness in consideration of desired absorption performance, flexibility, and the like can be employed.

Moreover, in this invention, in addition to the said absorber, the absorbent sheet which complements the absorption performance of this absorber is further provided. Such an absorbent sheet will be described later.

[Back Sheet] Next, the back sheet that can be used in the absorbent article of the present invention will be described. In the urine-absorbing pad 1 of the above-described embodiment, the back sheet 23 is made of a hydrophobic nonwoven fabric or a liquid-impermeable sheet as shown in FIGS. 1 to 3 , and is arranged in the thickness direction of the urine-absorbing pad 1 The non-skin-opposing surface side S ₂ in T has a predetermined air permeability, and also prevents the permeation of excretory fluid such as urine discharged from the wearer, so that the excretory fluid does not leak to the outside (for example, wearing the user's clothing, etc.) to function.

As shown in FIGS. 1 to 3 , the back sheet 23 extends from the front end edge 1A in the longitudinal direction L of the urine absorbing pad 1 across the rear end edge 1B, and extends from the urine absorbing pad 1 , as shown in FIGS. 1 to 3 . One side edge in the width direction W in 1 extends across the other side edge, and has a substantially hourglass-shaped external shape like the external shape of the urine absorbing pad 1 . In addition, in the present invention, the external shape of the back sheet is not limited to such an aspect, and as long as the surface of the non-skin-opposing surface of the absorber disposed on the skin-opposing surface side of the back sheet is not exposed, various types of Arbitrary external shape and size of application etc.

In the present invention, the hydrophobic non-woven fabric that can be used as the inner sheet is not particularly limited as long as it has predetermined hydrophobicity, air permeability, etc. For example, it can be used: spun-bonded non-woven fabric; point-bonded non-woven fabric; melt-blown non-woven fabric; SMS non-woven fabric (Non-woven fabric formed of a multi-layer structure (for example, a 5-layer structure, etc.) including three or more non-woven fabric layers of spunbond layer/meltblown layer/spunbond layer); any hydrophobic nonwoven fabric such as hot air nonwoven fabric. Such a hydrophobic nonwoven fabric is not necessarily liquid-impermeable when the absorbent article has a leak-proof sheet between the back sheet and the absorber, especially, the absorbent article does not have a leak-proof sheet between the back sheet and the absorber. In the case of the leak-proof sheet, it is preferable to use one having liquid impermeability.

Further, the constituent fibers of the hydrophobic nonwoven fabric are not particularly limited, and for example, polyolefin-based fibers such as polyethylene and polypropylene; polyester-based fibers such as polyethylene terephthalate; core-sheath-type conjugate fibers can be used Thermoplastic resin fibers such as various composite fibers, etc. In addition, the basis weight and thickness of the hydrophobic nonwoven fabric are not particularly limited as long as the effects of the present invention are not inhibited, and any basis weight and thickness in consideration of 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 arbitrary liquid-impermeable sheet, such as a plastic film formed of a thermoplastic resin such as polyethylene, can be used. liquid-impermeable sheet. As such a liquid-impermeable sheet, it is desirable to use one having both liquid-impermeability and certain air permeability (for example, a plastic film having a plurality of openings).

Moreover, in the above-mentioned embodiment, the urine-absorbing pad 1 is provided with the liquid-impermeable leak-proof sheet 26 between the back sheet 23 and the absorber 22 . Such a leak-proof sheet 26 is composed of a plastic film formed of a thermoplastic resin such as polyethylene, and prevents the permeation of excretory fluid such as urine discharged from the wearer, so that the excretory fluid does not leak to the outside. functionaries. The provision of such a leak-proof sheet is not a necessary constituent element of the absorbent article of the present invention, and if the absorbent article is provided with the leak-proof sheet, leakage of excretory fluid such as urine can be more effectively suppressed.

In addition, in the present invention, the position where the leakage preventing sheet is arranged is not particularly limited as long as it is an area where the function of the leakage preventing sheet can be exhibited, and the leakage preventing sheet may extend from the front area to the rear area of the absorbent article as in the above-mentioned embodiment. It may be arranged only in a specific area such as the central area.

[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 of the above-described embodiment, the pair of side sheets 24 and 25 are, as shown in FIGS. 1 to 3 , on the skin-opposing surface side S ₁ of the top sheet 21 , and are arranged on the absorbent sheet 21 . The band-shaped side sheet 24 at one end in the width direction W of the urine pad 1 and the band-shaped side sheet 24 arranged at the end at the other end in the width direction W of the urine absorbent pad 1 The side sheets 25 are formed. The side sheet 24 on the one side and the side sheet 25 on the other side are, as shown in FIG. 1 , as viewed in plan, from the front side edge 1A in the longitudinal direction L of the urine absorbing pad 1 to the rear side edge. 1B is extended, and, as shown in FIG. 2 , the widthwise direction outer side end portion 24L of the side sheet 24 and the widthwise direction outer side end portion 25R of the side sheet 25 located on the outer side of the widthwise direction W are formed. The leakage preventing sheet 26 is joined to one side end and the other side end of the width direction W of the leakage preventing sheet 26 to form a fixed end. The inner end portion 24R and the widthwise inner end portion 25L of the side sheet 25 are not joined to any member, but form free ends.

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

Furthermore, in the above-described embodiment, each of the side sheet 24 on the one side and the side sheet 25 on the other side in the widthwise direction W is at the end portion on the inner side in the widthwise direction, as shown in FIGS. 1 and 3 . In the vicinity of 24R and the vicinity of the inward end portion 25L in the widthwise direction, along the longitudinal direction L, the side sheet 24 and the side sheet 25 are respectively arranged so that the side sheet 24 and the side sheet 25 are contracted in the longitudinal direction L, and each widthwise inward side end portion 24R is arranged. , 25L elastic member 27 for standing up. Due to such contraction of the elastic member 27, the inward end portions 24R and 25L of the above-mentioned side sheets 24 and 25 in the widthwise direction stand up, thereby preventing leakage of excretion fluid such as urine in the widthwise direction. The leak-proof wall portion 28.

In the present embodiment, as shown in FIG. 1 , the elastic member 27 is arranged from the front area _AF in the longitudinal direction L of the urine absorbing pad 1 over a wide area of the rear area _AB , but in the present invention , the configuration of the elastic member is not particularly limited. For example, the elastic member may be arranged over the entire length of the pair of side sheets in the longitudinal direction, or may be arranged in the vicinity of the front side edge and the rear side except for the longitudinal direction of the pair of side sheets as in the above-described embodiment within a predetermined range near the end edge. Moreover, if the elastic member is arrange|positioned like the latter, there exists an advantage that the edge part in the longitudinal direction of the so-called absorbent article is hard to warp.

In the present invention, the elongation ratio when the elastic member is attached to the pair of side sheets is not particularly limited as long as the cover sheet is not stretched excessively and the leakage of excretory fluid is unlikely to occur. Such elongation ratio is relatively The natural length of the elastic member is, for example, in the range of 1.3 to 3.0 times, preferably in the range of 1.5 to 2.5 times, and more preferably in the range of 1.7 to 2.3 times. In addition, in the above-mentioned embodiment, although one elastic member 27 is arranged at each of the widthwise inner side end portion 24R of the side sheet 24 and the widthwise direction inner side end portion 25L of the side sheet 25, in this case The invention is not limited to such an arrangement, and two or more elastic members may be arranged in each of the pair of side sheets. In addition, as the elastic member, generally used thread rubber etc. can be used for absorbent articles such as urine-absorbing pads and disposable diapers.

Furthermore, in the above-described embodiment, the pair of side sheets 24 and 25 are formed of a liquid having a long and vertically elongated belt-like external shape 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 as long as a predetermined leak-proof wall portion can be formed, liquid impermeable sheets of any external shape and size can be used. Permeable sheet.

The tape-shaped liquid-impermeable sheet that can be used as a side sheet is not particularly limited as long as it has predetermined liquid-impermeability, flexibility, etc. spunbond nonwovens, point-bonded nonwovens, spunbond/meltblown/spunbond (SMS) nonwovens, etc.), liquid-impermeable synthetic resin films, and any liquid such as these laminated bodies Impervious sheet.

In addition, the basis weight and thickness of the tape-shaped liquid-impermeable sheet (for example, hydrophobic nonwoven fabric, etc.) that can be used as the side sheet are not particularly limited as long as the effects of the present invention are not hindered, and can be adopted in consideration of desired Arbitrary basis weight and thickness such as liquid impermeability and flexibility.

In addition, the provision of such side sheets is not a necessary constituent element of the absorbent article of the present invention. If the absorbent article is provided with such side sheets, especially in the width direction of the absorbent article, in addition to more effective suppression of In addition to leakage of excretory fluid such as urine, the cover sheet has an advantage that the cover sheet is easily moved relative to the surface direction relative to the surface sheet as described above because the cover sheet is joined.

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

<Covering sheet> In the urine-absorbing pad 1 of the above-described embodiment, the covering sheet 3 is in a thickness with the low-friction member 4 in the rear region _AB of the urine-absorbing pad 1, as shown in FIGS. 1 , 2 and 4 . The direction T is repeated on the skin-opposing surface side S ₁ of the low-friction member 4, and the low-friction member 4 is not exposed in plan view and is arranged to include the entirety of the low-friction member 4 (that is, on the cover sheet). 3 and the surface sheet 21 are arranged with the low friction member 4 interposed). The manner in which the cover sheet 3 is arranged in this way can further reduce the friction resistance between the cover sheet 3 and the cover sheet 21 , so that the cover sheet 3 is relatively easy to move in the face direction relative to the cover sheet 21 .

Moreover, the cover sheet 3 has a substantially rectangular outer shape long in the longitudinal direction L in a plan view, and the substantially rectangular outer shape has a predetermined longitudinal direction along the longitudinal direction L of the urine absorbing pad 1 Length (for example: 150mm-250mm), and the predetermined width direction length (for example: 100mm-200mm) along the width direction W of the urine absorbing pad 1. Further, in the present invention, the outer shape of the cover sheet is not particularly limited as long as it does not inhibit the effects of the present invention, and any outer shape (eg, circular, elliptical, polygonal, etc.) can be adopted.

In the present invention, the material constituting the cover sheet is not particularly limited. For example, non-woven fabrics such as hot air non-woven fabrics and spunbond non-woven fabrics; woven fabrics; knitted fabrics; Either hydrophilic or hydrophobic. Since the cover sheet used in the present invention can be in direct contact with the skin of the wearer, it is desirable to use a sheet-like member having excellent skin feel and flexibility even among the above-mentioned sheet-like members. Examples of such sheet-like members include non-woven fabrics such as hot air non-woven fabrics and spun-bonded non-woven fabrics. In addition, the sheet-like member constituting the cover sheet is preferably excellent in hydrophobicity from the point that the skin of the wearer (specifically, the skin of the buttocks) of the wearer is not easily wetted. In addition, even if a hydrophilic material is used as the sheet-like member forming the cover sheet, since excretory fluid such as urine and its moisture can be permeated to a certain extent, there is a so-called problem that it is difficult to get caught between the wearer's skin and the cover sheet. Advantages of excretion such as urine and its moisture.

Furthermore, in the present invention, the cover sheet is formed of a sheet-like member that is stretchable in at least one direction (that is, a direction corresponding to the longitudinal direction of the absorbent article), and specifically, an extensible sheet The extensible sheet-like member has an extensible elongation region at least in a direction corresponding to the longitudinal direction of the absorbent article, and has a stretchable region extending in a direction corresponding to the longitudinal direction of the absorbent article. 1 or a plurality of strength maintaining parts. In addition, in the above-described embodiment, the cover sheet 3 has, as shown in FIGS. 1 and 4 , an extension region 32 that can be stretched in the longitudinal direction L of the urine absorbent pad 1, and the extension region 32 is directed toward the urine absorbent pad 1. The sheet 1 has seven strength maintaining portions 31 that extend in the longitudinal direction L of the sheet 1 and are arranged at predetermined intervals in the widthwise direction W. As shown in FIG. If the cover sheet is formed of such an extensible sheet-like member, since the above-mentioned stretched region follows the shape of the wearer's body and can be tightly fitted, even if the wearer moves while wearing the absorbent article It is also possible to make the above-mentioned cover sheet move and stretch in the face direction with the wearer's skin with good precision in accordance with the movement of the wearer's buttocks, and it is difficult to impart friction, offset force, etc. to the wearer's skin. induced physical stimulation. Furthermore, since the cover sheet has one or a plurality of strength-retaining portions extending in the longitudinal direction in the above-mentioned stretched region, the above-described stretched region is less likely to become a problem when the absorbent article applies a biasing force in the longitudinal direction. In the state in which the longitudinal direction L is shrunk as shown in FIG. 9( b ), it is easy to assume that the stretched region of the cover sheet is in a state of shrunk in the longitudinal direction due to repeated application of the above-mentioned deflection force for a long time. It returns to the original state shown in FIG.9(a). Therefore, the absorbent article of the present invention is provided with such a specific extensible cover sheet, so that even if a deflection force is repeatedly applied for a long time, the expected function of the cover sheet (that is, the so-called so-called cover sheet) can be fully exhibited. The cover sheet moves and even stretches in accordance with the movement of the wearer's buttocks, and does not easily impart physical stimulation to the wearer's skin due to friction and offset force), and as a result, it is difficult to cause discomfort to the wearer. , and it is not easy to cause the occurrence and aggravation of skin diseases such as bedsores.

Here, in the present specification, "extensible" may refer to: according to the method described in "6.3 Tensile Strength and Elongation" of JIS L 1913:2010, the object is oriented in two opposite predetermined directions (that is, at least toward Longitudinal direction) is not broken when pulled with a force of 5.0N, and is stretched by 3% or more relative to the length (100%) of the object in the stretching direction in its natural state (that is, the state before stretching). (that is, an elongation case where the length after elongation becomes 103% or more).

Furthermore, in the present invention, the extension direction in the extension region of the cover sheet may be in other directions (for example, the direction corresponding to the width direction, etc.) as long as it extends in a direction corresponding to the longitudinal direction of the absorbent article elongation. Since the extension direction of the cover sheet is multi-directional, the cover sheet can be made to more accurately follow the shape of the wearer's body.

In addition, as long as the stretched region of the above-mentioned cover sheet is stretched at least in the direction corresponding to the longitudinal direction of the absorbent article, regardless of whether or not there is shrinkage after stretching, even if the cover sheet is stretched and shrunk (except by elastic members) In addition to those that are stretchable and stretchable, including those that expand and contract due to the external force generated by the movement of the wearer's buttocks), the external force that is not generated by the movement of the wearer's buttocks is almost Those who do not shrink.

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). For example, it can be appropriately used: Nonwoven fabric or knitted fabric with uneven structure in which ridges and grooves extending continuously in the direction are alternately and repeatedly arranged in the longitudinal direction; nonwoven fabric in which elastic members such as elastic fibers are arranged along the longitudinal direction of the absorbent article or woven fabric; and a laminate of any combination of these, and the like. Among them, the nonwoven fabric having the above-mentioned uneven structure can be stretched not only in the region having the uneven structure, but also has a small contact area with the wearer's skin and has little physical irritation to the skin, so it is particularly suitable as a cover sheet. usage of.

Furthermore, in the above-described embodiment, the extension region 32 of the cover sheet 3 includes, as shown in FIGS. 4 and 5 , two ends located at both ends in the width direction W and extending in the longitudinal direction L part side extension parts (specifically, the end part side extension part 32L on one side and the end part side extension part 32R on the other side in the widthwise direction W), and these end part sides in the widthwise direction W Between the extension parts and extending in the longitudinal direction L, the six inner side extension parts 32C; .

As shown in FIGS. 6 and 7 , each of the end side extension parts 32L, 32R and the inner side extension part 32C protrudes toward the skin-opposing surface side S1 in the thickness direction T of the urine-absorbing pad ₁ , The ridge portion 32A extending continuously in the width direction W, and the concave groove portion 32B concave in the thickness direction T toward the non-skin-opposing surface side S ₂ and extending continuously in the width direction W, have A specific concavo-convex structure in which the direction L is arranged alternately and repeatedly. In addition, the interval between the ridge portions 32A arranged in the longitudinal direction L (that is, the distance between the vertices of the ridge portions arranged in the longitudinal direction) is not particularly limited, and can be adopted according to desired extensibility and skin contact. Arbitrary interval (for example: interval in the range of 1mm to 10mm, etc.).

Furthermore, in the above-mentioned end side extension parts _32L and 32R, the ridge part 32A has, as shown in FIG _. The first ridge portion 32A ₁ ; and the second ridge portion 32A ₂ having a relatively short width in the width direction and not contacting the end edges 32E _L and 32E _R of the elongated region 32 in the width direction, these first ridge portions 32A ₁ and the second ridge portion 32A ₂ are alternately and repeatedly arranged along the longitudinal direction L with the groove portion 32B interposed therebetween, as shown in FIG. 5 . Here, the width direction lengths of the ridge portions 32A (including the first ridge portions 32A ₁ ) and the groove portions 32B are not particularly limited, and any lengths corresponding to desired extensibility, skin feel, etc. can be adopted. (For example, the length in the range of 5 mm to 50 mm, etc.), and the difference between the width direction lengths of the first ridge portion 32A ₁ and the second ridge portion 32A ₂ is not particularly limited, for example, 1 mm to 5 mm In the range. In addition, in FIG. 5 , the specific form of the end-side extension portion 32R shows that the end portion 32A _1E on the outer side in the widthwise direction of the first ridge portion _32A1 is in contact with the widthwise direction end edge 32E _R of the elongated region 32 . Furthermore, the end portions 32A to _2E on the outer side in the widthwise direction of the _second ridge portion 32A2 are located more inwardly in the widthwise direction W than the ends 32E _R in the widthwise direction of the elongated region 32 .

If the elongated portion 32R on the end side of the elongated region 32 is configured to have such a specific first ridge portion 32A ₁ and second ridge portion 32A ₂ , the above-mentioned first ridge portion 32A is ₁ side in the width direction. In order to ensure as wide an extension region 32 of the cover sheet 3 as possible, the above-mentioned end portions 32A to _2E of the second ridge portion 32A ₂ on the outer side in the widthwise direction and the end edge 32E _R of the extension region 32 in the widthwise direction. The non-shaped part of the uneven structure between (hereinafter, sometimes referred to as "the non-shaped part located on the outer side in the width direction of the second ridge part") can ensure a certain strength, so Even if the offset force is repeatedly applied for a long time, the cover sheet is not easily torn, and the function of the cover sheet can be more reliably and stably exerted.

In addition, in the present invention, the end-side extension portion having such specific first and second ridge portions may be arranged only at one end portion in the width direction of the extension region (in this case, The other end portion has the same width in the width direction as the inner extension portion and is an end portion side extension portion having a constant ridge portion and groove portion.), but can be equally secured from the vicinity of both ends in the width direction. The strength of the cover sheet is that the end-side elongated portions having such specific first and second ridges are arranged at both ends of the elongated region in the width direction.

Furthermore, in the present embodiment, the ridge portions 32A and the groove portions 32B are, as shown in FIG. 6 , the cross-sectional shape along the longitudinal direction L has a substantially zigzag uneven shape, but in the present invention, the ridge portions are The specific shape of the grooves and grooves is not limited to those having the above-mentioned concavo-convex shapes as long as the cover sheet can give at least the elongation in the longitudinal direction. The cross-sectional shape is an arbitrary shape such as a substantially waveform shape.

In the above-described embodiment, the protruding strips 32A and the concave grooves 32B of each extension part in the extension region 32 of the cover sheet 3 are formed by gear shaping with respect to the substantially flat nonwoven fabric serving as the base material of the cover sheet 3 The projections 32A and the grooves 32B are formed by pressing from both sides in the thickness direction T to form predetermined portions. In addition, in this gear forming process, by simultaneously pressing or not pressing the portions between the respective extension parts from both sides in the thickness direction T, as shown in FIG. 6 and FIG. The strength holding part 31 . Therefore, the above-mentioned concave-convex structures such as the protruding streak portion 32A and the concave groove portion 32B are not formed in the strength maintaining portion 31 , and the strength maintaining portion 31 is a surface on one side of the thickness direction T as shown in FIGS. 6 and 7 . Each of (surface 31a on the skin-opposing surface side) and the surface on the other side (surface 31b on the non-skin-opposing side) is formed substantially flat. In addition, the width direction length of the strength maintaining portion 31 is not particularly limited as long as the effect of the present invention can be achieved. The height from the surface 31a on the skin-opposing surface side to the apex of the ridge portion 32A is not particularly limited, and an arbitrary height (for example, a range of 0.1 mm to 2 mm) can be adopted according to desired extensibility, skin feel, etc. height, etc.).

In addition, the elongation region 32 formed in this way is relatively low in strength (rigidity) by pressing the nonwoven fabric serving as the base material in the thickness direction T in the protruding line portion 32A and the concave groove portion 32B and extending it. In the strength maintaining portion 31, the strength (rigidity) can be maintained by pressing the nonwoven fabric as the base material in the thickness direction T and compressing it, or by not pressing the nonwoven fabric as the base material in the thickness direction T, and maintaining its strength. Becomes high. Therefore, in the urine-absorbing pad 1 of the present embodiment, such a strength holding portion 31 having a relatively high relative strength exists in the extension region 32 of the cover sheet 3 extending in the longitudinal direction L. Therefore, the urine-absorbing pad 1 is provided with a long side. In the case of a deflection force in the direction L, the stretched region 32 of the cover sheet 3 is less likely to be in a state in which a plurality of wrinkles WR gather and contract in the longitudinal direction _L as shown in FIG. Even if the stretched region 32 of the cover sheet 3 is in a state of shrinking in the longitudinal direction L due to repeated application of the deflection force over a long period of time, the original state as shown in FIG. 9( a ) can be easily restored. Thereby, the urine-absorbing pad 1 can fully exhibit the expected function of the cover sheet 3 (that is, the so-called movement of the cover sheet 3 according to the movement of the wearer's buttocks and It stretches and does not easily cause physical stimulation to the wearer's skin due to friction and offset force), and as a result, it is less likely to cause discomfort to the wearer, and it is less likely to cause skin diseases such as bedsores. .

Here, in this specification, the strength retention portion refers to a portion having a relatively higher strength (rigidity) than the extension portion in the extension region, and the specific strength value is not particularly limited. In addition, the comparison of the strength of the strength retention portion and the extension portion can be performed, for example, in the following manner. First, after preparing measurement samples of a predetermined size having the same structure as the strength retention portion and the extension portion, respectively, a tensile testing machine (Shimadzu Corporation) equipped with a weight sensor with a maximum load capacity of 50 N was used for each measurement sample. (manufactured by Co., Ltd., automatic stereograph type AGS-1kNG), the tensile strength is measured under the same conditions (for example, the distance between the clamps of 100mm, the tensile speed of 100mm/min, etc.), and the strength of the two can be compared. . In addition, the stretching direction at the time of measuring the tensile strength is the direction corresponding to the longitudinal direction of the absorbent article.

Further, in the present invention, the structure of the strength retaining portion in the stretched region of the covering sheet is not particularly limited as long as the strength in at least the longitudinal direction of the stretched region of the strength retaining portion can be ensured to some extent. Those with a concavo-convex structure smaller than the concavo-convex structure formed by the above-mentioned ridges and grooves; a laminated structure in which a strength-reinforcing member (for example, a strip-shaped nonwoven fabric, sheet, etc.) is adhered to a predetermined portion of the base material; A compressed structur that compresses a predetermined portion of the substrate with or without heating; a molten structur that fuses a predetermined portion of the substrate with or without pressure; or a structurant having any combination of these .

Furthermore, in the above-described embodiment, the strength retaining portion 31 of the cover sheet 3 is continuous from the front end edge _32EF to the rear end edge _32EB in the longitudinal direction L of the elongated region 32 as shown in FIG. 4 . Extensively configured to exist. If the strength retaining portion 31 of the cover sheet 3 extends from the front end edge _32EF to the rear end edge _32EB of the stretched region 32 in this way, the above-mentioned function of the strength retaining portion 31 can be made on the long side of the stretched region 32 . Since the entire area of the direction L is exhibited, the urine-absorbing pad 1 having such a structure can more reliably exhibit the function of the cover sheet 3 described above.

In addition, as shown in FIG. 4 , the cover sheet 3 described above has a lateral side non-elongation region extending in the longitudinal direction L at each of both end portions 3E _L and 3E _R in the width direction W (in FIG. 4 ). The lateral non-stretch region 33L on one side and the lateral non-stretch region 33R on the other side of the width direction W), such lateral non-stretch regions 33L and 33R are also the same as the above-mentioned strength maintaining portion 31 Each of the surface having the skin-opposing surface side and the surface on the non-skin-opposing side has a substantially flat structure and relatively high strength.

Furthermore, the urine-absorbing pad 1 of the present embodiment has, as shown in FIG. 1 , two fold lines extending in the longitudinal direction L for folding the urine-absorbing pad 1 in the widthwise direction W (see FIG. 1 . The strength retaining portion 31 of the cover sheet 3 is connected to the fold line L ₁ on one side of the width direction W and the fold line L ₂ on the other side in the width direction W, which are provided across the width direction central axis _CL .) The polygonal lines L ₁ and L ₂ of the same are arranged repeatedly. In this way, when the strength retaining portion 31 of the cover sheet 3 overlaps with the fold lines L ₁ and L ₂ extending in the longitudinal direction L of the urine absorbent pad 1 , the strength retaining portion 31 is given a habit of folding extending in the longitudinal direction L. , the cover sheet 3 is further less likely to be in a state where wrinkles gather.

In addition, 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 the effect of the present invention is not hindered, and any one corresponding to the desired packaging form of the absorbent article can be adopted. Any number of bars (eg, 1 bar, 4 bars, etc.).

In addition, the arrangement form of the elongated regions in the cover sheet (for example, the number and arrangement position of each of the elongated parts and the strength-retaining parts, the length of the elongated part in the longitudinal direction and the width in the width direction, etc.) do not hinder the effect of the present invention. In this case, there is no particular limitation, and an arbitrary arrangement form can be adopted. For example, as a modification of the cover sheet that can be used in the present invention, the cover sheet 3' shown in FIG. 8 can be mentioned. In addition, since the structure other than the structure which differs from the cover sheet 3 of the above-mentioned embodiment in FIG. 8 is basically the same as that of the cover sheet 3 mentioned above, description is abbreviate|omitted. The cover sheet 3' shown in FIG. 8 has a front side edge 4EF in the longitudinal direction _L of the low-friction member ₄ arranged on the non-skin-opposing surface side S2 of the cover sheet 3' in plan view The front side non-elongation region 34 which is further located on the front side _SF and continuously extends in the width direction W. If the cover sheet 3' has such a non-stretched region (the front side non-stretched region 34), a certain strength against the above-described deflection _force can be ensured at the portion on the front side SF of the cover sheet 3', and therefore, it can be more Further, the cover sheet 3' is less likely to shrink in the longitudinal direction L or torn due to wrinkles.

In addition, in the present invention, the ratio of the stretched region to the cover sheet is not particularly limited as long as the effect of the present invention can be achieved. The overall top view area is more than 50% of the area within the range of 100% or less.

Furthermore, in the above-described embodiment, the cover sheet 3 is such that, as shown in FIGS. 1 and 2 , the end portion 3E _L on one side in the widthwise direction W is joined in the widthwise direction of the side sheet 24 on the above-mentioned one side. On the other hand, the inner side portion 24S of the square side end portion 24R and the end portion 3E _R on the other side in the width direction W are joined to the inner side in the width direction of the side sheet 25 on the other side. The inner side portion 25S of the end portion 25L. The bonding of the cover sheet 3 and the side sheets 24 and 25 is performed from the front side edge 3EF in the longitudinal direction _L of the cover sheet 3 to the rear side edge, as shown in FIG. A pair of lateral side joint portions 5 and 5 extending in the direction L (more specifically, a first joint portion 51 located on the outer side in the width direction W, and a first joint portion 51 located on the inner side in the width direction W) the second joint part 52). In addition, in this embodiment, the cover sheet 3 does not extend to the both ends of the width direction W of the urine absorbing pad 1 .

In this way, the cover sheet 3 is joined to the pair of side sheets 24 and 25 which can form the leak-proof wall portion 28 with a large degree of freedom of movement, and the surface sheet 21, the absorber 22, the leak-proof sheet 26, The members such as the back sheet 23 are not directly fixed, so it is difficult to restrict the movement of the cover sheet 3. Instead, they are joined to the side sheets with a large degree of freedom of movement, and the cover sheet 3 is opposed to the surface sheet 21 of the urine absorbent pad 1. Easy to move. In addition, when the pair of side sheets 24 and 25 joined to the cover sheet 3 is worn when the urine absorbent pad 1 is worn, the respective inward end portions 24R and 25L in the widthwise direction stand up to form a leakage preventing wall portion 28 . Therefore, when the pair of side sheets 24 and 25 stand up, the cover sheet 3 joined to the pair of side sheets 24 and 25 floats from the top sheet 21 and the low-friction member ₄ to the skin-opposing surface side S1 As a result, the frictional resistance between the cover sheet 3 and the low-friction member 4 is further less likely to be generated.

In addition, a part of the above-mentioned bonding of the cover sheet 3 and the side sheets 24 and 25 is performed in the lateral side non-elongation regions 33L and 33R located at both ends 3E _L and 3E _R of the cover sheet 3 in the width direction W of the cover sheet 3 . , the peripheral portion of the joint portion (that is, the first joint portion 51 of the side joint portions 5, 5) is prone to stress concentration when a biasing force is applied in the longitudinal direction L of the urine-absorbing pad 1 In the case of the part, the peripheral part is positioned in the lateral non-stretched regions 33L and 33R of the cover sheet 3 to ensure a certain strength, so even if the urine-absorbing pad 1 is displaced in the longitudinal direction L When a force is repeatedly applied for a long time, tearing of the cover sheet 3 is less likely to occur, and the above-described function of the cover sheet 3 can be more stably exhibited. As a result, the urine-absorbing pad 1 of the present embodiment can achieve the above-mentioned functions and effects more stably for a longer period of time (that is, it is possible to prevent the occurrence of skin diseases such as so-called discomfort to the wearer and bedsores, etc.). , the effect is not easily caused by deterioration).

In addition, a part of the above-mentioned bonding of the cover sheet 3 and the side sheets 24 and 25 is in the width direction of the first ridge portion 32A ₁ of the end side extension portions 32L and 32R of the cover sheet 3 in plan view. The end portions 32A and _1E on the outer side are overlapped, and the region that does not overlap with the second ridge portion 32A ₂ is also performed. The peripheral portion is also a portion where stress tends to concentrate when a biasing force is applied in the longitudinal direction L of the urine absorbing pad 1, and the peripheral portion is located outside the widthwise direction including the _second ridge portion 32A2 described above. A certain strength is ensured in the area of the non-shaped portion on the square side, so even when the above-mentioned deflection force of the urine-absorbing pad 1 is repeatedly applied for a long time, the cover sheet 3 is less likely to be torn, and the cover sheet 3 is less likely to be torn. The function of the cover sheet 3 described above is stably exhibited.

Furthermore, in the above-described embodiment, the first ridge portion 32A ₁ and the second ridge portion 32A ₂ of the end side extension portions 32L and 32R of the cover sheet 3 are alternately repeated in the longitudinal direction L with the groove portion 32B interposed therebetween. By being arranged, the non-shaped portion located on the outer side in the width direction of the second ridge portion 32A ₂ described above is formed at a certain interval along the longitudinal direction L of the cover sheet 3, and can be formed along the cover sheet 3 at regular intervals. The longitudinal direction L of the sheet 3 further stably secures the strength against the above-described deflection force.

Furthermore, it overlaps with each of both end portions 3E _L and 3E _R in the width direction W of the cover sheet 3 in the thickness direction T, and joins the cover sheet 3 and a pair of side sheets of the pair of side sheets 24 and 25 . As described above, each of the side joint portions 5 and 5 includes the first joint portion 51 located on the outer side in the widthwise direction W and extending in the longitudinal direction L, and the first joining portion 51 located on the inner side in the widthwise direction W. , and the second joint portion 52 extending in the longitudinal direction L, however, the first joint portion 51 and the second joint portion 52 are, as shown in FIGS. 4 and 5 , the front of the first joint portion 51 The side edge _51EF overlaps with the front side edge 3EF of the cover sheet 3 in the thickness direction _T , and the front side edge _52EF of the second joint portion 52 is positioned more rearward than the front side edge _3EF of the cover sheet 3 S _B ground is configured. Here, the specific position of the front edge _52EF of the second joint portion 52 is not particularly limited, but may be, for example, within a range of 1 mm to 50 mm from the front edge _3EF of the cover sheet 3 to the rear. In addition, in this embodiment, the rear side edge _51EB of the 1st junction part 51 and the rear side edge _52EB of the 2nd junction part 52 both overlap in the thickness direction T with the rear side edge of the cover sheet 3 . If the cover sheet 3 has the first joint portion 51 and the second joint portion 52 and the side sheets 24 and 25 in such a specific arrangement, when the cover sheet 3 applies the above-mentioned deflection force, the stress is most likely to be concentrated in the part. The front side part of the second joint part 52 is not joined to the side sheets 24 and 25, so that the stress applied to the front side part escapes (distributes to other parts), and the cover sheet 3 is not easily torn. Furthermore, The cover sheet 3 can be more securely fixed to the side sheets 24 and 25 by the first joint portion 51 located further outward in the widthwise direction than the above-described second joint portion 52 . Thereby, the urine-absorbing pad 1 of the present embodiment can stably exhibit the function of the cover sheet 3 described above for a longer period of time.

In addition, each of the above-mentioned pair of side sheets 24 and 25 and both ends 21L and 21R in the widthwise direction W of the top sheet 21 are, as shown in FIG. The junction parts 5 and 5 are further joined to the outer side junction parts 6L and 6R which are separated by a predetermined distance on the outer side in the width direction W, respectively. In this way, the lateral side junctions 5 and 5, which are the junctions between the pair of side sheets 24 and 25 and the cover sheet 3, and the junctions between the pair of side sheets 24 and 25 and the top sheet 21 are When the outer side joining parts 6L and 6R are separated from each other, the separated parts 24D and 25D (that is, the lateral side joining parts 5 and 5 of the pair of side sheets 24 and 25 and the outer side joining parts) The portion between 6L and 6R) exists, while ensuring a region that allows the movement and extension of the cover sheet 3 in the longitudinal direction L (that is, the degree of mobility of the cover sheet), when the pair of side sheets 24, 25 When standing up, the cover sheet 3 can be displaced from the surface sheet 21 so as to float. Thereby, the urine absorbing pad 1 of the present embodiment is such that even when the above-mentioned biasing force is applied, the lateral side joints 5 and 5 of the pair of side sheets 24 and 25 and the outer joints are formed. The portions 24D and 25D between 6L and 6R relieve the deflection force, and the cover sheet 3 can be moved and stretched smoothly and surely in accordance with the movement of the wearer's buttocks.

In addition, the width direction length and arrangement interval of each of the above-mentioned joining parts (that is, the first joining part 51, the second joining part 52, and the outer side joining parts 6L and 6R) are not particularly limited as long as the effect of the present invention is not hindered. For the limitation, any length (for example, a length in the range of 1 mm to 20 mm, etc.) and an arrangement interval (for example, the arrangement interval of the first joint part and the second joint part can be used in accordance with the desired joint strength, etc.) can be adopted. Within the range of 10 mm, the arrangement interval of the lateral joint portion and the outer joint portion is in the range of 5 mm to 50 mm, etc.).

Furthermore, in the present invention, the cover sheet may be directly fixed to the main portion other than the above-mentioned side sheet in place of or in addition to the joining with the above-mentioned side sheet, as long as the cover sheet does not restrict the movement. . That is, the cover sheet can be partially engaged with respect to the various members constituting the main portion without restricting movement. For example, the cover sheet can be sufficiently bent to form drapability without restricting its motion, and can be joined to the main portion of the absorbent article (more specifically, to the surface sheet and the back sheet).

For example, in the above _- described embodiment, the cover sheet 3 has a rear end portion _3EB extending in the widthwise direction W as shown in FIG. The equally divided first area 3E _B1 in the width direction, the center area 3E _BC in the width direction, and the second area 3E _B2 in the width direction, the cover sheet 3 is located in the center part of the width direction center area 3E _BC (with the width direction center area 3E BC). A portion other than the portion where the widthwise direction central axis _CL overlaps) is joined to the surface sheet 21 . More specifically, the rear end portion 3EB of the cover sheet 3 is, as shown in FIG. 4 , a rear first joint portion extending from the first region 3E _B1 in the _width direction across the center region 3E _BC in the width direction. 71. The second joint portion 72 on the rear side extending from the second area 3E _B2 in the width direction across the central area 3E _BC in the width direction is joined to the skin-opposite surface of the top sheet 21, The part of the width direction central part of the direction central region is not joined to the surface sheet 21 .

In addition, in the present invention, the bonding form between the rear end portion of the cover sheet and the surface sheet is not limited to the aspect of the above-mentioned embodiment. Each of the two regions may not be joined to the top sheet or only a part of it may be joined to the top sheet in the central region in the widthwise direction as long as a part or all of it is joined to the skin-opposing surface of the top sheet.

If the rear end portion of the cover sheet is joined to the surface sheet in such a specific form, the mobility of the cover sheet can be sufficiently ensured in the above-mentioned central area in the width direction, and the first area in the width direction and the width of the cover sheet can be sufficiently ensured. The second region in the side direction can restrict the movement of the cover sheet within a predetermined range, so that the cover sheet does not move or stretch excessively in the longitudinal direction. Accordingly, the absorbent article having such a structure is less likely to be in a state that may be difficult to restore due to excessive movement and elongation of the cover sheet (for example, a state in which wrinkles are strongly gathered), and the function of the cover sheet can be more reliably exhibited.

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

In the present invention, each of the above-mentioned joints (that is, the lateral joints (first joints, second joints), outer joints, rear first joints, and rear second joints) The bonding method is not particularly limited as long as the effect of the present invention is not inhibited, and any bonding method using a hot-melt adhesive, hot-melt bonding, or the like can be adopted.

Furthermore, in the above-described embodiment, the cover sheet 3 is arranged only behind the urine-absorbing pad 1 in the vicinity of the buttocks of the wearer (especially, the vicinity of the sacrum) where skin diseases such as bedsores and rashes are likely to occur. The area _AB is not limited to such an arrangement form in the absorbent article of the present invention, and the cover sheet may be arranged not only in the rear area but also in the front area and a part of the center area where the above-mentioned skin diseases may occur.

Furthermore, in the above-mentioned embodiment, the cover sheet 3 is arranged so as to extend from the rear side edge 3EB of the cover sheet 3 to the rear side edge _1B of the urine absorbing pad 1 as shown in FIG. 1 . Such arrangement of the cover sheet is not an essential component of the absorbent article of the present invention, and it is desirable that the cover sheet extends to the rear side of the absorbent article as far as possible. If the cover sheet is extended to such a position, since the vicinity of the buttocks of the wearer, which is prone to skin diseases, can be more widely covered, the above-mentioned skin diseases can be less likely to occur.

The size of the cover sheet is not particularly limited as long as the effect of the present invention can be achieved. For example, the length of the cover sheet in the longitudinal direction is in the range of 25% to 100% of the length in the longitudinal direction of the rear region, and ideally 30 %~80%, more preferably 40%~70%. In addition, when the outer shape of the cover sheet is a shape other than a rectangular shape, the length in the longitudinal direction represents the maximum length in the longitudinal direction of the shape. On the other hand, the length in the width direction of the covering sheet is in the range of 50 mm to 250 mm, preferably in the range of 80 mm to 200 mm, more preferably in the range of 50 mm to 250 mm, in consideration of the range of the site where skin diseases are likely to occur and the easy leakage of excretory fluid. It is in the range of 100mm~180mm. In addition, when the outer shape of the cover sheet is a shape other than a rectangular shape, the widthwise length means the maximum length in the widthwise direction of the shape.

<Low friction member> In the urine absorbing pad 1 of the above-described embodiment, the low friction member ₄ is, as shown in FIGS. Between the cover sheets 3, it is comprised by the low friction sheet-like member which can reduce frictional resistance with the cover sheet ₃ arrange|positioned on the skin-opposing surface side S1.

Moreover, the low-friction member 4 has a substantially rectangular outer shape in plan view, and the substantially rectangular outer shape has a predetermined longitudinal length along the longitudinal direction L of the urine absorbing pad 1 (for example: 100 mm~ 200 mm), and a predetermined width in the width direction W along the width direction W of the urine-absorbing pad 1 (for example: 50 mm to 150 mm). In addition, in the present invention, the outer shape of the low-friction member is not limited to such a form, and any outer shape (for example, circular, oval, multi-dimensional, etc.) can be adopted as long as the frictional resistance with the above-mentioned cover sheet can be reduced. angle, etc.) and dimensions. In addition, the low friction member may be constituted by a single sheet-like member as in the above-mentioned embodiment, or may be constituted by a plurality of sheet-like members divided into at least one of the longitudinal direction and the lateral direction. At this time, although the plurality of sheet-like members constituting the low-friction member are arranged at a predetermined interval in at least one of the longitudinal direction and the widthwise direction, if the plurality of sheet-like members are arranged in this way, it is easy to ensure Liquid permeability and ventilation.

In the present invention, the sheet-like member that can be used as a low-friction member is not particularly limited as long as the frictional resistance with the above-mentioned cover sheet can be reduced. Resin sheet-like members made of resins or resin compositions with low friction coefficients such as silicone resins, fluororesins such as polytetrafluoroethylene, etc.; olefin resins such as polyethylene, polypropylene, polyethylene terephthalate At least one surface (surface on the skin-opposite side in the absorbent article) of a base sheet formed of a general-purpose thermoplastic resin such as an alcohol ester or a polyester resin or a thermoplastic resin composition is coated with silicon Coated sheet-like members of low friction materials such as resins and fluororesins with a low coefficient of friction. In this specification, the sheet-like member and base sheet include, in addition to sheets and films having a thin and flat structure, a porous structure having a plurality of openings, and a concavo-convex structure having a plurality of protrusions and recesses. Sheets of arbitrary structures, etc.; fibrous sheets of woven fabrics, non-woven fabrics, knitted fabrics, etc.; and sheet-like structures of arbitrary forms, such as laminated sheets of these arbitrary combinations.

When the above-mentioned resin-made sheet-like member is used as the low-friction member, such a resin-made sheet-like member preferably contains high-density polyethylene (HDPE) in a ratio of 50% by mass or more, and is preferably 50/50 to 75/25 The mass in the range of 1 is more ideal than that including high density polyethylene (HDPE) and low density polyethylene (LDPE). If the low-friction member is formed of a resin-made sheet-like member containing high-density polyethylene in a proportion of 50% by mass or more, the low-friction member has a certain hardness or more due to the high-density polyethylene component, and the friction resistance can be reduced. member. Furthermore, if the resin-made sheet-like member forming the low-friction member contains high-density polyethylene and low-density polyethylene in a mass ratio in the range of 50/50 to 75/25, it is possible to obtain the low-friction member by using the soft low-density polyethylene component. In order to reduce the stress (that is, internal residual stress) remaining inside the sheet-like member when the sheet-like member is formed from a resin material, etc., the above-mentioned sheet-like member (especially, the end portion in the width direction of the above-mentioned sheet-like member) is The relaxation of the internal residual stress can suppress rounding (that is, curling). Therefore, in an absorbent article including such a resin-made sheet-like member as a low-friction member, since the cover sheet can move more smoothly on the low-friction member, it is more difficult to apply to the skin of the wearer. Physical stimuli caused by friction and offset forces.

In addition, in this specification, high-density polyethylene refers to polyethylene with a density of 0.942 g/cm ³ or more, and low-density polyethylene refers to polyethylene with a density of 0.910 g/cm ³ or more and less than 0.930 g/cm ³ .

In addition, when the above-mentioned coated sheet-like member is used as the low-friction member, such a coated sheet-like member is formed on at least one of the base sheets formed of the above-mentioned general-purpose thermoplastic resin or thermoplastic resin composition. The surface can be obtained by coating a predetermined amount (for example, an amount in the range of about 0.6 g/m ² to 0.8 g/m ² ) of a low friction material such as silicone resin. In addition, when silicone resin is used as the low friction material, the form of such silicone resin is not particularly limited, and any form of solvent-based, solvent-free or latex-based resin can be used. There is no particular limitation, and any silicone resin of thermal curing type or ultraviolet curing type can be used. However, when the above-mentioned general-purpose thermoplastic resin or a plastic film formed of a thermoplastic resin composition is used as the base sheet, when the silicone resin is cured by heating, the base sheet may be deformed and melted. UV-curable silicone resins are ideal. In addition, the coating method of the low-friction material is not particularly limited, and any coating method such as a spray method, a roll method, and a dipping method can be adopted.

In addition, the structure of the low-friction member is not particularly limited as long as it has low-friction properties that can reduce frictional resistance with the cover sheet disposed on the skin-opposing surface side, and any member other than the above-mentioned sheet-like member may be used. (for example, at least one elongated rod-shaped member, at least one belt-shaped member, etc.), considering the points that can ensure a wide range of low-friction regions, the easy sliding properties of the cover sheet on the surface of the low-friction member (surface direction It is desirable to use a sheet-like member having a substantially flat structure as a whole as in the above-mentioned embodiment as the flexibility of the entire absorbent article), ease of movement), and the like.

In addition, the sheet-like member that can be used as a low-friction member is not limited to those having a substantially flat structure as a whole as in the above-mentioned embodiment. Such sheet-like members are, for example, both ends of the width direction of the absorbent article. The part is warped (that is, displaced) toward the skin-opposing surface side. When both ends in the width direction of the sheet-like member forming the low-friction member are displaced toward the skin-opposing surface side, the ends displaced toward the skin-opposing surface side are positioned on the skin of the low-friction member. The cover sheet on the opposite side is pressed against the wearer's skin, so that the cover sheet can more accurately follow the movement of the wearer's skin.

Furthermore, in the present invention, the static friction coefficient of the surface of the low-friction member (at least the surface on the skin-opposing surface side) can be in the surface direction together with the wearer's skin as long as the above-mentioned cover sheet can be ensured in accordance with the movement of the wearer. The degree of ease of sliding is not particularly limited, and for example, it is in the range of 0.04 to 0.80, preferably in the range of 0.10 to 0.50, and more preferably in the range of 0.10 to 0.40. Also, the coefficient of kinetic friction of the surface of the low-friction member is also not particularly limited as long as the above-mentioned cover sheet can be easily slidable to the extent that it can move in the surface direction together with the wearer's skin in accordance with the movement of the wearer. For example, it is 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.

In addition, the static friction coefficient and the dynamic friction coefficient can be measured according to JIS P8147 (b) horizontal method. For the measurement of the coefficient of static friction and the coefficient of dynamic friction, the friction cotton cloth "No. 3 blended (canequim No. 3)" specified in JIS L0803 was used as a test piece for the horizontal plate, and a low-friction member was used as a weight. Use test pieces.

In the present invention, even if the low-friction member and the cover sheet are arranged in the same thickness direction as the cover sheet (that is, the low-friction member and the cover sheet have the same plan view area), the low-friction member includes the cover sheet in plan view. However, it is desirable to arrange the low-friction member in a position overlapping with the cover sheet in the thickness direction from the point of ensuring good skin feel, liquid permeability, air permeability, etc., and to be arranged in a narrower range than the cover sheet. . In this case, even when the above-mentioned cover sheet moves in the plane direction, the low-friction member preferably has a plan view area below a certain level such that the low-friction member is not exposed. For example, the plan view area of the low-friction member is in the plan view of the cover sheet. Within the range of 10% to 80% of the area, ideally within the range of 20% to 60%, and more ideally within the range of 25% to 50%.

In addition, the position where the low-friction member is arranged is not particularly limited as long as it overlaps with the cover sheet in plan view, and it is ideally at the approximate center of the cover sheet. In addition, when the absorbent article has a fold line extending in the width direction for the absorbent article in the state of being folded and unfolded in the longitudinal direction, it is desirable that the low-friction member is arranged at a position that does not overlap with the fold line in a plan view. If the low-friction member is arranged at a position where it does not overlap with such a fold line, since the low-friction member does not have a folding habit extending in the width direction, it is easy to ensure the above-mentioned cover sheet, especially in the longitudinal direction. Because of the ease of movement, the absorbent article can be stored in a packaging bag or the like in a state where the absorbent article is folded tightly in the longitudinal direction.

In addition, the thickness of the low friction member is not particularly limited unless it inhibits the effects of the present invention, and any thickness (eg, thickness in the range of 0.01 mm to 1.0 mm) can be employed that takes into consideration flexibility, strength, and the like. The thickness of the low-friction member can be measured by using an arbitrary non-contact measuring device such as a laser displacement meter, or by magnifying a cross-section using a scanning electron microscope or the like. In addition, the thickness of the low-friction member takes into account the influence of measurement errors and the like, and the average value of the measurement values at five different arbitrary places is used.

In addition, it is preferable that the above-mentioned low-friction member is joined to the surface sheet by any joining means such as a hot melt adhesive. Although this joining means can be applied continuously or intermittently in at least one of the longitudinal direction and the width direction of the absorbent article, when the joining means is intermittently applied, it is easy to ensure air permeability and the absorbent article The sultry heat inside is not easy to produce.

In addition, 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 are low-viscosity adhesives with a measurement value of 0.78 N or less by a probe test, and are at least partially covered by Bonding is ideal. If the surface sheet and the low-friction member having a plurality of openings are at least partially joined via such a low-viscosity adhesive, the low-viscosity adhesive does not face the skin through the openings of the low-friction member. The cover sheet on the surface side is joined to fix the low-friction member to the top sheet, so that the cover sheet can be moved more stably while suppressing displacement and peeling of the low-friction member. In addition, the measurement value of the probe test can be measured using an arbitrary probe-type test apparatus (for example, a viscosity tester manufactured by RHESCA, Ltd., Japan, etc.).

In addition, in the absorbent article of the present invention, since it is not an essential component to have the above-mentioned low-friction member, the absorbent article of the present invention may not have the above-mentioned low-friction member when the movement and extension of the above-mentioned cover sheet can be guaranteed. friction member.

<Absorptive sheet> In the urine-absorbent pad 1 of the above-described embodiment, the absorbent sheet 8 is longer than the length extending in the width direction W on the skin-opposing surface side S ₁ of the absorber 22 as shown in FIG. 1 . The side direction central axis _CW is located further on the rear side _SB , and the front side edge _3EF of the above-mentioned cover sheet 3 is arranged across the longitudinal direction L.

If the absorbent article further includes the absorbent sheet arranged at the above-mentioned specific position in addition to the absorbent body, even if the excretory fluid is repeatedly supplied from the wearer, the absorbent body and the absorbent sheet can be used stepwise by the absorbent body and the absorbent sheet. It absorbs the excretion fluid which flows toward the rear side of the longitudinal direction of an absorbent article. Thereby, in the absorbent article provided with such an absorbent sheet, the wearer's buttocks are not easily wetted by the excretory fluid, and further, the strength of the cover sheet can be prevented from being wetted by the excrement fluid.

Moreover, in the above-mentioned embodiment, the absorbent sheet 8 has a substantially rectangular outer shape having a length in the longitudinal direction L in a plan view, as shown in FIG. 1 , and the outer shape has: _{A predetermined length in the longitudinal direction (for example, 100 mm to 200 mm) in which the central region AC extends across the rear region A B ;} 100mm~200mm). In addition, in the present invention, the external shape of the absorbent sheet is not limited to such an aspect, and any external shape (for example, circular, oval, polygonal, etc.) corresponding to desired absorption performance and the like can be adopted.

In the present invention, the absorbent sheet is not particularly limited as long as it includes a sheet-like member of a superabsorbent polymer. For example, a superabsorbent polymer such as a sodium acrylate copolymer is covered with a covering sheet such as a hydrophilic tissue paper. . Moreover, the absorbent sheet may contain the same absorbent material as the above-mentioned absorber in addition to the superabsorbent polymer.

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

The present invention is applicable to various absorbent articles such as (light) incontinence pads and disposable disposable diapers, for example, in addition to the urine-absorbing pads of the above-described embodiments. Moreover, the absorbent article of this invention is not limited to the above-mentioned embodiment, its modification, etc., in the range which does not deviate from the objective and gist of this invention, it can combine suitably, substitute, change, etc. as appropriate. In addition, in this specification, the ordinal numbers such as "1st" and "2nd" are used to distinguish the items to which the ordinal numbers are assigned, and do not indicate the order, priority, and importance of each item.

1‧‧‧Urine absorbent pad (absorbent article) 2‧‧‧Main part 21‧‧‧Surface sheet 22‧‧‧ Absorber 23‧‧‧Inner sheet 24‧‧‧Side sheet (one side) 25‧‧ ‧Side sheet (the other side) 26‧‧‧Leak-proof sheet 27‧‧‧Elastic member 28‧‧‧Leak-proof wall 3‧‧‧Covering sheet 31‧‧‧Strength retaining section 32‧‧‧Elongation area 32L‧ ‧‧End side extension part ( _one side) 32R‧‧‧End side extension part (the other side) 32C‧‧‧Inner side side extension part 32A Part 32A ₂ ‧‧‧Second ridge part 32B‧‧‧Groove part 33L‧‧‧Side side non-elongation area (one side) 33R‧‧‧Side side non-elongation area (the other side) 4‧‧‧ Low-friction member 5‧‧‧Side engaging portion 51‧‧‧First engaging portion 52‧‧‧Second engaging portion 6L‧‧‧Outer engaging portion (one side) 6R‧‧‧Outer engaging portion (the other side) 71‧‧‧First joint part on the rear side 72‧‧‧Second joint part on the rear side 8‧‧‧Absorptive sheet AF ‧‧‧Front area A _C ‧‧‧Central area _{A B ‧‧} ‧Rear zone F _Z ‧‧‧Offset force

1 : is the top view which looked at the urine absorbing pad of one Embodiment of this invention from the surface sheet side in the thickness direction in the unfolded state. Fig. 2 is a cross-sectional view taken along the 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 taken along the 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 the main part of the cover sheet shown in Fig. 4 . Fig. 6 is a cross-sectional view taken along the line VI-VI of the cover sheet shown in Fig. 5 . Fig. 7 is a cross-sectional view taken along the line VII-VII of the cover sheet shown in Fig. 5 . Fig. 8 is a plan view of a modification of the cover sheet. FIG. 9 , FIG. 9( a ) is an explanatory diagram schematically showing a state after the wearer wears the urine-absorbing pad according to an embodiment of the present invention (a state in which no offset force is applied), FIG. 9( b ) , is an explanatory diagram schematically showing a state in which a deflection force is applied to the urine-absorbing pad from its state.

1‧‧‧Urine absorbent pads (absorbent articles)

1A‧‧‧Front edge

1B‧‧‧Rear side edge

2‧‧‧Main Department

21‧‧‧Surface sheet

22‧‧‧Absorber

24‧‧‧Side sheet (one side)

24L‧‧‧Outer side end in width direction

24R‧‧‧Inward side end in width direction

24S‧‧‧Inner side part

25‧‧‧Side sheet (the other side)

25L‧‧‧Inward side end in width direction

25R‧‧‧Outer side end in width direction

25S‧‧‧Inner side part

27‧‧‧Elastic components

28‧‧‧Leak-proof wall

3‧‧‧Covering sheet

31‧‧‧Strength retention part

32‧‧‧Extended area

3E _B ‧‧‧Rear side end

3E _F ‧‧‧Front edge

3E _L ‧‧‧ Both ends

3E _R ‧‧‧End of the other side

4‧‧‧Low friction components

4E _F ‧‧‧Front edge

5‧‧‧Side side joint

8‧‧‧Absorbent sheet

A _B ‧‧‧rear area

A _C ‧‧‧Central area

A _F ‧‧‧Front area

C _L ‧‧‧Central axis in width direction

C _W ‧‧‧Central axis in the longitudinal direction

L‧‧‧long side direction

L ₁ ‧‧‧Polyline

L ₂ ‧‧‧Polyline

S _B ‧‧‧rear side

W‧‧‧Broadside direction

S _F ‧‧‧Front side

Claims (9)

An absorbent article having: a longitudinal direction, a broad direction, and a thickness direction, and, in the longitudinal direction, has: a front area, a rear area, and the absorbency of a central area located between the two areas An article characterized in that the absorbent article includes a main portion of a liquid-permeable topsheet, and a cover sheet, which is positioned on the skin-opposite side of the topsheet at least in the rear region, and is opposite to the topsheet. The main part is partially joined, the cover sheet has at least an elongation region that can be extended in the longitudinal direction, and has one or a plurality of strength retaining parts extending in the longitudinal direction in the elongation region, and the main part is further provided with : an absorber extending from the front region to the rear region on the non-skin-opposing surface side of the top sheet; and an absorbent sheet, which is located on the skin-opposing surface side of the absorber The center in the longitudinal direction of the absorbent article is located more rearward than the longitudinal center axis extending in the width direction, and the front side edge in the longitudinal direction of the cover sheet is straddled in the longitudinal direction in the longitudinal direction. 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. The absorbent article according to claim 1, wherein each of the both ends of the cover sheet in the width direction has a lateral side non-stretching region extending in the longitudinal direction, and on the side The square-side non-stretched region is joined to the aforementioned main portion. The absorbent article according to claim 1 or claim 2, wherein the elongated region is an end portion included in at least one of the both ends in the width direction, and is located within the width of the strength maintaining portion. The end-portion side extension part adjacent to the edge direction, the end-portion side extension part has: a convex part protruding toward the skin-opposing surface side in the thickness direction and extending continuously in the width direction; The non-skin-opposing surface side is concave, and the concave and groove portions extending continuously in the width direction have a concavo-convex structure alternately and repeatedly arranged in the longitudinal direction, and the protruding strips have a long length in the width direction. , and the first ridge portion that contacts the edge in the width direction of the elongated region, and the second ridge portion that has a short width in the width direction and does not contact the edge in the width direction of the elongated region, the cover sheet, In a plan view, a region overlapping with the end portion on the outer side in the width direction of the first ridge portion and not overlapping with the second ridge portion is joined to the main portion. The absorbent article according to claim 3, wherein the end side extension portion is formed by the first ridge portion and the second ridge portion interposed therebetween. The grooves are arranged alternately and repeatedly in the longitudinal direction. The absorbent article according to claim 1, wherein the strength retaining portion extends from the front end edge to the rear end edge in the longitudinal direction of the elongated region. The absorbent article according to claim 1, wherein the absorbent article further includes, in the thickness direction, a low-friction member positioned between the top sheet and the cover sheet, and the cover sheet has a : a front-side non-elongation region that is located on the front side rather than the front-side edge in the longitudinal direction of the low-friction member and extends in the width-side direction. The absorbent article according to claim 1, wherein the absorbent article overlaps with each of both ends in the width direction of the cover sheet in the thickness direction, and the cover sheet and the main A pair of lateral-side joint parts of the part, and each of the pair of lateral-side joint parts has a first joint located on the outer side in the width direction and extending in the longitudinal direction. part, and a second joint part located on the inner side in the width direction and extending in the longitudinal direction, the front end edge of the first joint part is located at the front end edge of the cover sheet. In one of the overlapping thickness directions, the front end edge of the second joining portion is located more rearward than the front end edge of the cover sheet side. The absorbent article according to claim 7, wherein the main portion further includes extending from both ends in the width direction toward the longitudinal direction, and positioned on the skin-opposing surface side of the topsheet A pair of side sheets, and further, each of the side sheets of the pair and the both ends of the cover sheet in the width direction are joined by the side joints of the pair, and the other On the one hand, each of the pair of side sheets and both ends in the width direction of the cover sheet are joined on the lateral side of the pair by an outer side joining portion separated by a predetermined distance. The joint portions are respectively on the outer side of the aforementioned width direction. The absorbent article according to claim 1, wherein the cover sheet has a rear end portion extending in the width direction, and the rear end portion is divided into three equal parts in the width direction. The first area in the width direction, the central area in the width direction, and the second area in the width direction, the cover sheet is bonded to the surface sheet in the first area in the width direction and the second area in the width direction. On the one hand, in the said width direction central area, it is not joined to the said cover sheet or only a part is joined to the said cover sheet.

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