KR20170005493A - Absorbent article - Google Patents

Abstract

The present invention relates to an absorbent article comprising a liquid permeable top sheet (2), a liquid permeable secondary sheet (3), an absorbent (4) and a liquid impervious back sheet A second sheet 3 and an absorbent body 4 are laminated on both sides in the width direction in a thickness direction from the top sheet 2 side, Wherein the second sheet 3 has a pair of two-layered portions 30 by folding both end portions in the width direction and the two-layered portion 30 has an upper layer 33 and a lower layer 30, (36) in which the upper layer (33) and the lower layer (34) are not adhered to each other at positions outward in the width direction with respect to the adhesive region (35) At least a part of the non-adhering region (36) in the longitudinally central portion (1b) is located on the outer side in the width direction with respect to the compressed portion (7).

Description

[0001] ABSORBENT ARTICLE [0002]

The present invention relates to an absorbent article.

Examples of the absorbent article include a sanitary pad provided with an absorbent body for absorbing and holding excretion such as menstrual blood, for example, between the liquid permeable top sheet and the liquid-impervious back sheet. In the sanitary napkin, when the napkin is worn on the crotch and received a deforming force from the side, the napkin deforms into various shapes, resulting in problems such as poor fit. Thus, the upper elastic member is adhered to the entire area of the non-skin side of the absorbent body by an adhesive, and the lower elastic members are adhered to both side portions of the non-skin side of the upper elastic member by an adhesive, (See, for example, Patent Document 1) that the rigidity of both side portions of the sanitary napkin 1 is made higher than the rigidity of the central portion so that the cross-sectional shape of the sanitary napkin can be convexly directed toward the skin side.

Japanese Patent No. 3737251

However, in the above-described sanitary pads, if an adhesive is applied to the whole area of the adhesive surface between the upper-layer elastic member and the lower-layer elastic member, both sides in the width direction are hardened by the adhesive, resulting in discomfort when worn.

SUMMARY OF THE INVENTION The present invention has been made in view of the above problems, and an object of the present invention is to provide an absorbent article which is less uncomfortable when worn.

The main object of the present invention is to provide a liquid-permeable top sheet, a liquid-permeable secondary sheet, an absorbent body and a liquid-impervious back sheet having a longitudinal direction, a width direction and a thickness direction orthogonal to each other Wherein the absorbent article has a pair of compressed portions compressed in the thickness direction from the top sheet side, the top sheet, the second sheet and the absorbent body on both side portions in the width direction, Wherein the two-layer portion includes a bonding region in which the upper layer and the lower layer are bonded to each other, and a non-bonding region in which the upper layer and the lower layer are not bonded to each other at a position outside the bonding region in the width direction Wherein at least a part of the non-adhering region in the central portion in the longitudinal direction has an adhesive region, Of an absorbent article, characterized in that located on the outside.

Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

INDUSTRIAL APPLICABILITY According to the present invention, it is possible to provide an absorbent article with reduced feeling of discomfort when worn.

1 is a schematic plan view of the skin side of the wearer on the pad.
2 is a schematic plan view of the pad on the wearer's non-skin side;
3A and 3B of FIG. 3 are schematic cross-sectional views of the pad at positions AA and BB in FIG.
Fig. 4 is a view for explaining an application region of the adhesive in the secondary sheet. Fig.
Fig. 5 is a view for explaining the positional relationship of the first compression portion, the adhesion region in the two-layer portion of the secondary sheet, and the non-adhesion region.
FIG. 6A of FIG. 6 shows a sectional shape of the pad in a natural state, and FIG. 6B shows a sectional shape of the pad when worn.
Fig. 7A of Fig. 7 is a table showing the results of the evaluation test of the secondary sheet, and Fig. 7B is a graph showing the relationship between the compressive load applied to the sample and the thickness of the sample.

At least the following will become apparent from the description of the present specification and the accompanying drawings.

A liquid permeable second sheet, an absorbent body, and a liquid impervious back sheet are stacked in this order in the longitudinal direction, the width direction and the thickness direction orthogonal to each other, and the liquid permeable top sheet, Wherein the absorbent article is provided with a pair of compressed portions compressed in the thickness direction from the top sheet side in a state in which the top sheet, the second sheet and the absorbent body are folded back, Wherein the two-layer portion has a bonding region in which the upper layer and the lower layer are bonded and a non-bonding region in which the upper layer and the lower layer are not bonded to each other at a position outward of the bonding region in the width direction, And at least a part of the non-adhering area is located on the outer side in the width direction with respect to the compression part in the central part .

According to such an absorbent article, when the crotch tightening force for compressing the absorbent article in the width direction is exerted at the time of wearing, the non-adhesive region is deformed and the crotch tightening force is absorbed. Further, since the second sheet contacts the wearer through the top sheet, the crotch tightening force is dispersed. Therefore, the repulsive force from the absorbent article to the wearer is weakened, and the sense of discomfort at the time of wearing is reduced.

Wherein the absorbent article is characterized in that at least a part of the non-adhesive region at the center in the longitudinal direction is located outside the absorbent body in the width direction.

According to such an absorbent article, the wearer is more likely to absorb the crotch tightening force because the second sheet, which is lower in rigidity than the absorbent body, contacts the absorbent body via the topsheet before the absorbent body. Further, the width of the absorbent article can be adjusted according to the wearer by the non-adhesive region of the second sheet. Therefore, the sense of discomfort at the time of wearing is further reduced.

The absorbent article according to any one of the preceding claims, wherein an end of the non-adhesive region in the width direction at the center in the longitudinal direction coincides with an outer edge of the absorbent body in the width direction, Wherein the absorbent article is located inside the width direction of the absorbent article.

According to such an absorbent article, since the width of the non-sticky region is wide, the crotch tightening force is more easily absorbed and the adjustment range of the width of the absorbent article is widened. Therefore, the sense of discomfort at the time of wearing is further reduced.

In this absorbent article, at the central position in the longitudinal direction, the inner end of the folded back portion of the secondary sheet in the width direction is located on the outer side in the width direction with respect to the compressed portion, Wherein an inner end in the width direction of the folded back portion of the secondary sheet is located inward in the width direction with respect to the compressed portion at a position spaced apart in the longitudinal direction.

According to such an absorbent article, since the widthwise end portion of the secondary sheet is held by the compression portion while the deformation of the non-adhesive region of the secondary sheet is not blocked by the compression portion at the center position in the longitudinal direction, The tightening force is more easily absorbed, and the feeling of discomfort at the time of wearing is further reduced.

The absorbent article according to any one of claims 1 to 3, wherein the second sheet is a sheet having a compression recovery rate of not less than 30% in the thickness direction and a thickness of not less than 0.5 mm in a natural state, Absorbent article.

According to such an absorbent article, the crotch tightening force is more easily absorbed by the elasticity of the secondary sheet, and the feeling of discomfort when worn is further reduced.

Wherein the absorbent article is characterized in that in the second sheet, one side is higher in rigidity than the other side, and the second sheet is folded at both ends in the width direction so that the one side is inward .

According to such an absorbent article, the crotch tightening force is more easily absorbed because the side (the other side) having a low rigidity is directed to the wearer side in the two-layered portion of the secondary sheet, and the discomfort during wearing is further reduced.

=== Outline of physiological pads ===

As an example of the absorbent article, an embodiment will be described by taking a physiological pad (hereinafter, pad) as an example.

1 is a schematic plan view of the wearer's skin side in the pad 1. Fig. Fig. 2 is a schematic plan view of the wearer's non-skin side in the pad 1. Fig. 3A and 3B are schematic cross-sectional views of pad 1 at positions AA and BB in Fig. 4 is a view for explaining the application region of the adhesive 32 in the secondary sheet 3. Fig. The pad 1 has a longitudinal direction, a width direction and a thickness direction perpendicular to each other as shown in the figure. 3, the pad 1 is provided with a liquid permeable top sheet 2, a liquid-permeable secondary sheet 3, an absorbent 4 and a liquid-impervious back sheet (not shown) from the skin side in the thickness direction 5) are stacked in this order.

The absorber 4 is for absorbing and holding excretion such as menstrual discharge, and includes, for example, a hydrophilic fiber or a polymer absorbing polymer. The planar shape of the absorber 4 of the present embodiment is a gourd shape extending in the longitudinal direction as shown in Fig. In other words, both end portions 1a in the longitudinal direction are rounded, and the central portion 1b in the longitudinal direction is constricted in the width direction.

The top sheet 2 (for example, a nonwoven fabric or a hole film) and the back sheet 5 (for example, a synthetic resin film or a nonwoven fabric subjected to waterproof treatment) And a pair of wings 10 protruding outward in both widthwise directions from the central portion 1b in the longitudinal direction are formed. In the following description, the portion other than the wing portion 10 is also referred to as the main body portion 11 of the pad 1. [ Alternatively, the pad 1 may not have the wing portion 10. The periphery of the top sheet 2 and the peripheral edge of the back sheet 5 are joined together by heat embossing or an adhesive or the like to form the joining portion 6. [

The secondary sheet 3 is a sheet having liquid permeability and having elasticity in the thickness direction as compared with the topsheet 2 and the backsheet 5. Therefore, the second sheet 3 is preferably made of a synthetic resin fiber (for example, polyethylene PE, polypropylene PP, polyethylene terephthalate PET, or the like) which is easily imparted with liquid permeability and elasticity, is relatively inexpensive, Non-woven fabrics can be mentioned as an example. However, the present invention is not limited thereto and may be a nonwoven fabric of natural fibers (for example, cotton) or regenerated fibers (for example, rayon). The nonwoven fabric is preferably produced by a thermal bonding method in which liquid permeability and elasticity are easily imparted, and in particular, an air-through method in which hot air is passed through a fiber deposited on a net to form a sheet. However, the present invention is not limited to this, and other manufacturing methods such as a chemical bond method and a spun lace method may be used.

3, both ends in the width direction of the second sheet 3 are folded back to the non-skin side (the absorbent 4 side). Specifically, the width of the second sheet 3 in the width direction is set so that the folded portion at one end in the width direction of the second sheet 3 and the folded portion at the other end in the width direction do not overlap in the thickness direction Both ends of the folded portion are folded back. Therefore, the second sheet 3 has a pair of two-layered portions 30 located at both ends in the width direction and a first layered portion 31 located at the center in the width direction.

Further, after the adhesive 32 (for example, a hot-melt adhesive) is applied to the non-skin side surface of the second sheet 3, both ends in the width direction are folded back. As shown in Fig. 4, the adhesive 32 is applied to the entire area of the first layer 31 and the inner end of the second layer 30 in the width direction. The upper layer 33 and the lower layer 34 are adhered to each other by the adhesive 32 and the adhesive layer 35 is formed at a position on the outer side in the width direction with respect to the adhesive region 35, Adhesive region 36 in which the adhesive layer 33 and the lower layer 34 are not bonded by the adhesive 32. [ More specifically, in the two-layered structure 30, the area outside the widthwise direction of the adhesive area 35 is the non-adhesive area 36, and the non-adhesive area 36 is formed at the folded position 3b of the secondary sheet 3, (36) face each other. The two-layered portion 30 (the upper layer 33 and the lower layer 34) is not limited to being adhered by the adhesive 32, but may be adhered, for example, by heat embossing to form the adhesive region 35 .

Both ends in the width direction of the secondary sheet 3 are folded back by the adhesive region 35 and the secondary sheet 3 is stuck to the absorber 4 by the adhesive 32 applied to the first layer 31 . Further, the adhesive 32 may be applied in a linear manner without tightly applying the adhesive 32 so that the liquid permeability from the secondary sheet 3 to the absorber 4 is not impaired. The application pattern of the adhesive 32 is not limited to the pattern shown in Fig. 4, and may be applied, for example, in a band shape or a spiral shape. Although not shown, the topsheet 2 and the secondary sheet 3, the secondary sheet 3 (the two-layered structure 30) and the absorbent body 4, the absorbent body 4 and the backsheet 5 may be coated with an adhesive.

It is preferable that the thickness in the natural state is not less than 0.5 mm, the unit weight is not less than 20 g / m < 2 > in a state in which both end portions in the width direction are not folded back so as to exhibit elasticity of the secondary sheet 3, It is preferable to use a sheet having a compression recovery ratio RC of 30% or more (to be described in detail later) as a secondary sheet 3. On the other hand, a sheet having a thickness of 4.0 mm or less in a natural state and a unit weight of 40 g / m 2 or less in a state in which both end portions in the width direction are not folded so as to secure the liquid permeability of the secondary sheet 3 is referred to as a secondary sheet 3).

In the pad 1, the top sheet 2, the secondary sheet 3 and the absorbent body 4 are compressed in the thickness direction from the skin side (top sheet 2 side) by, for example, heat embossing, (Concave portions) 7 and 8 are formed. The compression section includes a pair of first compression sections 7 (a pair of compression sections) which are provided on both sides in the width direction at the longitudinally middle part 1b of the pad 1 and extend in the longitudinal direction, And a second compressed portion 8 which is provided at both longitudinal end portions 1a of the pad 1 and is in the form of a heart. Specifically, the first compression portion 7 has an arc portion that is convex inward in the width direction, and the arc portion thereof is curved along the width direction end 4a of the absorber 4. The first compression section 7 and the second compression section 8 are provided with the low compression sections 70 and 80 and the high compression sections 70 and 80 which are compressed at a pressure higher than that of the low compression sections 70 and 80, The portions 71 and 81 are alternately arranged. Further, the compression section may be a groove-like shape in which the recesses are continuous, or a plurality of recesses may be formed in a shape in which they are spaced apart and arranged in a line.

2, the pad 1 is fixed to the undergarment and the adhesive 20, 21 (for example, the pad 1 can be peeled off from the undergarment) Hot-melt adhesive). The adhesive has a first adhesive 20 provided on the main body 11 of the pad 1 and a second adhesive 21 provided on the wing 10. The first adhesive 20 is adhered to the skin side of the undergarment and the second adhesive 21 is adhered to the non-skin side of the undergarment by the folded wing 10. In FIG. 2, the case where the strip of the adhesive agent extending in the longitudinal direction is arranged in 10 rows in the width direction of the first adhesive agent 20 and one thread is provided in the second adhesive agent 21 is taken as an example, But is not limited thereto.

=== wearability of sanitary pad ===

5 is a view for explaining the positional relationship of the first compression portion 7, the adhesion region 35 of the two-layered portion 30 of the second sheet 3 and the non-adhesion region 36. As shown in Fig. Fig. 6A shows a cross-sectional shape of the pad 1 in a natural state, and Fig. 6B shows a cross-sectional shape of the pad 1 when worn. 6A and 6B are cross-sectional views of the center portion 1b in the longitudinal direction of the pad 1 taken along the width direction and the thickness direction.

As described above, in the pad 1 of the present embodiment, both ends in the width direction of the secondary sheet 3 are folded back, and both ends in the width direction of the secondary sheet 3 are the two-layered portion 30. [ In the two-layered portion 30, an inner end portion in the width direction is an adhesive region 35, and a region outside the widthwise direction of the adhesive region 35 is a non-adhesive region 36. [ The second sheet 3 is held in the folded state at both ends in the width direction by the adhesive region 35 and the two layered portions 30 outside the adhesive region 35 in the width direction, (36) are freely deformable.

5, at least a part (all or a part) of the non-adhering region 36 is arranged in the width direction (width direction) of the first compression portion 7 in the longitudinal direction central portion 1b of the pad 1, As shown in Fig. More specifically, of the pair of two-layered portions 30 of the secondary sheet 3, the non-adhering region 36 of the two-layered portion 30 on one side in the width direction is connected to the pair of first compression portions 7 Of the first compression portion 7 on one side in the width direction. Therefore, as shown in Fig. 6B, the two-layered portion 30 of the deformable second sheet 3 (the non-adhered portion) is freely deformable on the outer side in the width direction with respect to the first compression portion 7, Area 36).

Therefore, when the pad 1 is fitted to the thigh of the wearer and the crotch tightening force to compress the pad 1 inward in the width direction acts, the non-adhesive region 36 of the secondary sheet 3 causes the crotch tightening force (Absorbed). Particularly, in the present embodiment, the secondary sheet 3 is made of a sheet having high elasticity. Specifically, the compression recovery ratio RC in the thickness direction is 30% or more and the thickness in the natural state is 0.5 mm or more, The crotch tightening force is more likely to be absorbed by the secondary sheet 3. Both end portions in the width direction of the secondary sheet 3 are folded back to form a loop shape. Therefore, the wearer comes into contact with both end portions of the secondary sheet 3 in the width direction through the topsheet 2, so that the crotch tightening force is dispersed. Therefore, in the pad 1 of the present embodiment, when the crotch tightening force acts, the repulsive force to the wearer is weakened, and the sense of discomfort at the time of wearing is reduced.

If the adhesive is applied to the entirety of the two-layered portion 30 of the secondary sheet 3, for example, both ends in the width direction of the secondary sheet 3 are hardened by the adhesive. On the other hand, the two-layered portion 30 of the secondary sheet 3 of this embodiment has the non-adhesive region 36 and the non-adhesive region 36 faces the folded position 3b of the secondary sheet 3 Therefore, both ends in the width direction of the secondary sheet 3 are flexible. Therefore, the pain at the time of wearing can be prevented, and the discomfort during wearing can be reduced.

In the pad 1 of the present embodiment, the absorber 4 is constricted in the width direction in the longitudinal center portion 1b, that is, the region sandwiched between the thighs of the wearer. At least a part of the non-adhesive region 36 of the absorbent article 4 is positioned outside the absorbent body 4 in the width direction. Therefore, the second sheet 3, which is lower in rigidity (stiffness) than the absorbent body 4, comes into contact with the thigh of the wearer via the topsheet 2 before the absorbent body 4. That is, since the second sheet 3 receives the crotch tightening force before the absorbent article 4, the crotch tightening force is easily absorbed by the non-adhesive region 36 of the secondary sheet 3, and the discomfort feeling at the time of wearing is further reduced.

In other words, at the central portion 1b in the longitudinal direction of the pad 1 (main body portion 11), not only the absorber 4 which is likely to be stiff but also a deformable, Since the non-adhesive region 36 of the sheet 3 is present, the cushioning property in the width direction is high. Therefore, the width of the pad 1 can be adjusted according to the wearer by the non-adhesive region 36 of the second sheet 3 protruding outward in the width direction from the absorber 4. Therefore, the pad 1 of the present embodiment tends to fit on the wearer's body, and the feeling of discomfort when worn is reduced. Particularly, if the outer end 4a in the width direction of the absorbent body 4 is curved so as to be convex inward in the width direction, it is easy to follow the wearer's thigh, so that a discomfort feeling at the time of wearing is further reduced.

The absorbent body 4 may be wrapped with a liquid permeable covering material such as a tissue sheet or the like so that the length in the width direction of the covering material at the central portion 1b in the longitudinal direction of the pad 1 is longer than the length in the width direction of the secondary sheet 3 ) In the width direction. Even in this case, since the covering material is lower in rigidity than the absorbent body 4, there is no problem that the feeling of discomfort when worn is increased.

In the pad 1 of the present embodiment, the inner end 36a in the width direction of the non-adhesive region 36 of the secondary sheet 3 in the longitudinally central portion 1b is located on the side of the absorbent 4 The outer end 4a of the absorber 4 or the inner end in the width direction with respect to the widthwise outer end 4a. That is, the non-adhesive region 36 is present up to the end of the absorber 4, and the adhesive region 35 does not protrude outward in the width direction with respect to the absorber 4.

By thus enlarging the non-sticking region 36 protruding from the absorbent body 4 in the width direction, the crotch tightening force is easily absorbed, and the adjustment range of the width of the pad 1 is also widened. The wearer does not feel a region having a high rigidity (for example, the adhesive region 35) until the pad 1 is compressed to the region where the absorber 4 is present. Therefore, the sense of discomfort when worn is further reduced. However, the present invention is not limited to this, and the adhesive region 35 may protrude outward in the width direction as compared with the absorbent article 4.

In the pad 1 according to the present embodiment, the first compression portion 7 is curved so as to be convex inward in the width direction, but the inner end in the width direction of the folded back portion of the secondary sheet 3 3a (hereinafter referred to as a folded end 3a) extend along the longitudinal direction. 3B, the folded back end 3a of the secondary sheet 3 is in contact with the first portion 3b of the first sheet 3, And is located on the outer side in the width direction with respect to the compression section (7). 3A, the folded end 3a of the secondary sheet 3 is located at a position spaced apart from the longitudinal center position B in the longitudinal direction (for example, position A) (7) in the width direction.

1), the deformation of the non-adhering region 36 of the secondary sheet 3 is prevented by the deformation of the first compression portion 7, . Therefore, the crotch tightening force is easily absorbed by the non-sticking region 36 at the portion where the crotch tightening force most acts, and the discomfort during mounting is further reduced. On the other hand, the two-layered portion 30 of the secondary sheet 3 is integrated with the absorbent body 4 by the first compression portion 7 at a position spaced apart from the center position B in the longitudinal direction in the longitudinal direction. Therefore, even if the secondary sheet 3 is a sheet having high elasticity, both ends in the width direction are reliably held in a folded state.

For example, in the case where the length in the longitudinal direction of the absorber 4 is 195 mm, a section in which the folded end 3a of the secondary sheet 3 is located outside the first compression section 7 CC) in the longitudinal direction is 30 mm to 50 mm. The positional relationship between the first compression portion 7 and the folded end 3a of the second sheet 3 is not limited to the length of the first compression portion 7, Or may be constant regardless of the position in the direction.

In addition, the rigidity may be different on both sides of the second sheet 3. For example, in the case where the second sheet 3 is an air-through type nonwoven fabric, the net surface in contact with the net at the time of manufacture has higher fiber density than the side opposite to the net surface, and the rigidity is increased. When one side of the secondary sheet 3 has a higher rigidity than the other side of the secondary sheet 3 as described above, it is preferable that one side of the secondary sheet 3 be inward, that is, the side on which the adhesive 32 is applied, Both ends in the width direction of the secondary sheet 3 may be rewound. By doing so, the surface of the two-layer portion 30 of the secondary sheet 3 that faces the wearer can be a surface with low rigidity, that is, a surface with high cushioning property. Therefore, the crotch tightening force is easily absorbed, and the feeling of discomfort at the time of wearing is further reduced.

Particularly, as shown in Fig. 3, by folding both end portions in the width direction of the secondary sheet 3 back to the non-skin side, the high-rigidity side is not exposed to the wearer side and only the low- have. Therefore, even at the central portion in the width direction of the pad 1, the highly cushioned surface faces the wearer, so that the pitting property around the vaginal opening is improved. However, the present invention is not limited to this, and the lower surface of the secondary sheet 3 may be the inner side, or both ends in the width direction of the secondary sheet 3 may be folded back on the skin side.

As described above, the pad 1 of the present embodiment is suitable for wearing of the elementary and junior high school students who are worn to wear the pad 1 as compared with adults, because the feeling of discomfort when worn is reduced. In addition, elementary and junior high school students are small in width compared to adults. Therefore, if the width of the pad 1 can be adjusted by the non-adhesive region 36 of the second sheet 3 protruding in the width direction from the absorber 4 like the pad 1 of the present embodiment, · Even when junior high school student wears, the sense of incongruity is reduced.

In the pad 1 of the present embodiment, since the absorber 4 does not exist at both end portions in the width direction of the main body portion 11, the rigidity of both end portions in the width direction is low. 6A, the pad 1 is provided with the first compression section 7 because the second sheet 3 is located on the skin side of the absorber 4 at both ends in the width direction. Therefore, Both ends in the width direction of the pad 1 are slightly folded toward the skin side from the first compressed portion 7 even in the natural state. In the pad 1 of the present embodiment, the second sheet 3 protruding from the absorbent body 4 in the width direction is the two-layered portion 30. [ Therefore, when the crotch tightening force acts as in the case where the second sheet 3 protruding from the absorbent body 4 in the width direction is a single layer, it is possible to suppress that the both ends in the width direction of the pad 1 are crushed can do.

6B, when the crotch tightening force acts on the pad 1 of the present embodiment, both end portions of the pad 1 in the width direction are stably cleaned from the first compression portion 7 as a starting point And the cross-sectional shape of the pad 1 can be deformed into a W-shape. Therefore, excretion flowing in the width direction can be blocked at both end portions in the width direction of the pad 1 while closely contacting the central portion in the width direction of the pad 1 with the vaginal opening, thereby suppressing leakage of the excretion from the pad 1 . In addition, if the cross-sectional shape of the pad 1 is W-shaped, the pad 1 can easily fit into the periphery of the vaginal opening extending from the labia major to the inguinal part, and the gap between the wearer and the pad 1 is reduced. 1 can be suppressed. In addition, by improving the fit of the pad 1, the wearer can feel relieved.

In the second sheet 3 of the present embodiment, the folded back portions are not overlapped in the thickness direction, but a pair of two-layered portions 30 are located at both ends in the width direction, (31). Therefore, the cushioning property is secured by the non-adhesive region 36 of the two-layered portion 30 at both ends in the width direction of the pad 1, and the liquid permeability from the topsheet 2 to the absorbent body 4 Can be prevented. Therefore, it is possible to prevent the excretion from overflowing from the central portion in the width direction of the pad 1, and to suppress the leakage of the excretion from the pad 1. However, the present invention is not limited thereto, and the folded back portions of the secondary sheet 3 may be overlapped in the thickness direction.

The secondary sheet 3 is generally provided to prevent the backflow of the liquid from the absorbent body 4 or to enhance the concealability of the liquid absorbed by the absorbent body 4. It is possible to increase the cushioning property of such a secondary sheet 3 and also to raise both ends in the width direction of the pad 1 to the skin side. The structure of the pad 1 can be simplified and the cost can be reduced compared with the case where the member is provided on the outer side in the width direction with respect to the absorber 4 to play the role of cushioning and standing.

=== Evaluation test of the second sheet ===

Fig. 7A is a table showing the results of the evaluation test of the secondary sheet 3, and Fig. 7B is a graph showing the relationship between the compression load applied to the sample and the thickness of the sample. The vertical axis represents the compressive load (gf / cm2) applied to the sample, and the horizontal axis represents the thickness (mm) of the sample. The compression recovery percentage (%) in the present invention is an index showing the cushioning property (elasticity) of the secondary sheet 3 and is a value measured by an automatic compression tester (KES-FB3-AUTO-A) )to be.

For the samples of the second sheet 3 (comparative example, examples 1 and 2) to be described below, the compression recovery rate RC was measured by the compression tester, 1) and a sample single test were carried out. The results are shown in Fig. 7A.

The sample of the comparative example is a core-sheath type fiber composed of two layers of an upper layer and a lower layer, both of which are composed of PET (polyethylene terephthalate) as a core and PE (polyethylene) as a sheath, The thickness in the natural state is 0.3 mm, the unit weight is 30 g / m 2, the upper layer has a fineness of 2.8 dt, and the lower layer has a fineness of 2.2 dt.

The sample of Example 1 is a non-woven fabric of core-sheath type hollow fiber which is made of one layer and has a hollow fiber of PET as a core and has a thickness of 0.59 mm in a natural state, a unit weight of 30 g / Is 2.8 dt.

The sample of Example 2 is a nonwoven fabric of core-sheath type fibers consisting of one layer and made of PP (polypropylene) as a core and having PE as an initial layer, and has a thickness of 1.1 mm in a natural state, a unit weight of 30 g / Is 4.4 dt.

The compression recovery ratio RC was determined in accordance with the measurement method of the compression tester (KES-FB3) (SENS (recording sensitivity) was set to 2). Specifically, first, a sample (cut size 30 mm x 30 mm) is set in a compression tester. Then, a pressure plate (area 2 cm 2) having a circular plane with respect to the sample is lowered at a rate of 0.02 mm / sec to compress the sample. When the sample is compressed to a maximum compressive load of 50 gf / cm 2, the pressure plate is then lifted at the same speed of 0.02 mm / sec to release the compression on the sample. The sample is set such that the thickness direction of the secondary sheet 3 (sample) on the pad 1 coincides with the direction of descent and elevation of the pressure plate. Thereby, the relationship between the compression load and the thickness of the sample shown in Fig. 7B is obtained, and the compression recovery ratio RC is obtained from the relationship. In addition, the result of Fig. 7A is an average value of the compression recovery rate RC obtained by performing five measurements for one sample and five measurements.

7B, the curve c shows the relationship between the compressive load and the thickness of the sample in the process of applying the compressive load to the sample, and the curve d shows the relationship between the compressive load in the process of releasing the compressive load from the sample, Relationship. The value obtained by dividing the area b by the sum of the area a surrounded by the curve c and the curve d and the area b surrounded by the curve d, the straight line AC and the straight line BC is obtained as the compression recovery rate RC (= b / a + b). The larger the compression recovery ratio RC is, the better the recovery of the sample after compression and the higher the cushioning property (elasticity). 7B is the thickness of the sample when the sample is not compressed, and TM is the thickness of the sample when the maximum compressive load of 50 gf / cm < 2 > is applied to the sample. That is, the TO measured by the compression tester becomes the thickness of the sample in the natural state.

In addition, in the mounting test, the test person mounted the pad 1 incorporated as the second sheet 3 in each of the comparative example, the first and second examples, and the cushioning property. In the sample single test, the test subjects directly touched the comparative example, the example 1 and the example 2, and judged the cushioning property. The cushioning performance was evaluated in four stages, that is, when the cushioning property was very good, when the cushioning property was excellent, when the cushioning property was good, when the cushioning property was good, and when the cushioning property was not felt.

As shown in FIG. 7A, in the comparative example, the thickness TO in the natural state is the thinnest (0.3 mm), the compression recovery rate RC is the lowest (27.23%), and the cushioning property is not felt in both the mounting test and the sample single test Results were obtained. The results of Example 1 show that the thickness TO in the natural state is thicker (0.59 mm), the compression recovery rate RC is higher (33.14%), the cushioning property is excellent in the sample single test, and the cushioning property is felt in the mounting test . In Example 2, the thickness TO in the natural state was thicker (1.1 mm), the compression recovery rate RC was higher (44.99%), the cushioning property was excellent in the sample single test and the cushioning property was excellent in the mounting test Results were obtained. That is, it was found that the thicker the TO in the natural state, and the higher the compression recovery ratio RC, the more likely the wearer would feel the cushioning property.

7A shows that the secondary sheet 3 of the present embodiment is formed into a sheet having a compression recovery ratio RC of 30% or more and a thickness of 0.5 mm or more in a natural state in a state where both end portions in the width direction are not folded back More preferably, the compression recovery ratio RC is 40% or more, and the thickness in the natural state is 1.0 mm or more. By doing so, the cushioning property (elasticity) of the secondary sheet 3 can be increased to such an extent that the wearer can feel the cushioning property. That is, the crotch tightening force is absorbed by the non-sticking region 36 of the secondary sheet 3, and the feeling of discomfort when worn is reduced. However, the present invention is not limited to this, and a sheet having a compression recovery ratio RC of less than 30% or a sheet having a thickness of less than 0.5 mm in a natural state may be used as the secondary sheet 3.

=== Variation example ===

The central portion in the longitudinal direction of the absorber 4 is constricted and the non-adhesive region 36 of the secondary sheet 3 protrudes outward in the width direction with respect to the absorber 4. However, the present invention is not limited to this. For example, the absorber 4 may be elliptical or quadrangular, and the non-adhesive region 36 of the secondary sheet 3 may not protrude outward beyond the absorbent body 4 in the width direction. In addition, an adhesive region may be provided on the outer side in the width direction with respect to the non-sticking region 36 of the secondary sheet 3. Even in such a case, since the crotch tightening force is absorbed by the non-adhering region 36 of the secondary sheet 3, as compared with the case where the adhesive is applied to the entire two-layered portion 30 of the secondary sheet 3 , A sense of incongruity at the time of mounting is reduced.

In the above-described embodiment, a physiological pad is taken as an example of the absorbent article, but the present invention is not limited thereto. For example, the present invention can be applied to other absorbent articles such as disposable diapers, panty liners, and incontinence pads.

The foregoing embodiments are for the purpose of facilitating understanding of the present invention and are not intended to limit the present invention. It is needless to say that the present invention can be changed or improved without departing from the spirit of the present invention, and equivalents are included in the present invention.

1: (physiological) pad (absorbent article)
1a: end in the longitudinal direction
1b: central portion in the longitudinal direction
10: wing portion
11:
2: top sheet
3: Second sheet
30: 2 layer
31: 1 layer
32: Adhesive
33: Upper layer
34: Lower layer
35: Adhesion area
36: Non-adhesive area
4: absorber
5: back sheet
6:
7: First compression section (compression section)
70: low compression section
71:
8:
80: low compression section
81:
20: First adhesive
21: Second adhesive

Claims (6)

Width direction and thickness direction orthogonal to each other,
A liquid-permeable top sheet, a liquid-permeable secondary sheet, an absorbent body and a liquid-impervious back sheet are stacked in this order in the thickness direction,
An absorbent article having a pair of compressed portions compressed in the thickness direction from the top sheet side, the top sheet, the second sheet, and the absorbent body on both side portions in the width direction,
Wherein the second sheet has a pair of two-layer portions by folding both end portions in the width direction,
Wherein the two-layer portion has an adhesive region in which an upper layer and a lower layer are bonded, and a non-adhesive region in which an upper layer and a lower layer are not bonded to each other at a position outward of the adhesive region in the width direction,
And at least a part of the non-adhesive region is located on the outer side in the width direction with respect to the compression portion in the central portion in the longitudinal direction. The method according to claim 1,
And at least a part of the non-adhesive region is located on the outer side in the width direction with respect to the absorbent body in the central portion in the longitudinal direction. 3. The method of claim 2,
The widthwise inner end of the non-bonding area in the longitudinal direction matches the widthwise outer end of the absorbent body or the outer end of the absorbent body in the width direction And the elastic member is located inside the width direction. 4. The method according to any one of claims 1 to 3,
An inner end of the folded back portion of the secondary sheet in the width direction is located on the outer side in the width direction with respect to the compression portion at a central position in the longitudinal direction,
And an inner end in the width direction of the folded back portion of the secondary sheet is located inward in the width direction with respect to the compression portion at a position spaced from the central position in the longitudinal direction in the longitudinal direction Absorbent article. 5. The method according to any one of claims 1 to 4,
Wherein the second sheet is a sheet having a compression recovery rate in the thickness direction of not less than 30% and a thickness in a natural state of not less than 0.5 mm in a state in which both end portions in the width direction are not folded back. 6. The method according to any one of claims 1 to 5,
In the above-mentioned second sheet, one side has higher rigidity than the other side,
Wherein the second sheet is folded at both ends in the width direction such that the one surface is inward.

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