JP3224854U - Absorbent articles - Google Patents

Abstract

To improve stuffiness during wearing in an absorbent article having a convex portion protruding toward the skin side. An absorbent article having an absorbent body and skin-side sheets disposed closer to the skin than the absorbent body, wherein the skin-side sheets are squeezed in a thickness direction. Having the plurality of linear pressing portions Es formed as described above, and having the skin-side sheets 2 and 3 projecting to the skin side in the thickness direction in the inner region U surrounded by the plurality of linear pressing portions Es. 20 is formed, and a gap 21 is formed between the non-skin side surfaces of the skin-side sheets 2 and 3 and the absorber 10 in the projection 20, and the maximum length of the gap 21 in the thickness direction is formed. The thickness is equal to or less than the maximum thickness of the skin side sheets 2 and 3 in the inner area U. [Selection diagram] FIG.

Description

  The present invention relates to an absorbent article.

  The absorbent article disclosed in Patent Literature 1 includes a top sheet, a back sheet, and an absorber interposed between these two sheets. The topsheet is made of a nonwoven fabric having a concavo-convex structure in which streaky ridges and recesses extending in the longitudinal direction are alternately arranged in the width direction, and is joined to the adjacent lower sheet at the recesses. For this reason, the air flows in the longitudinal direction along the concave streak portion, and stuffiness is unlikely to occur. Further, the ridges of the topsheet have a hollow structure with the lower sheet, and the fiber density in the side area is lower than the fiber density in the top. For this reason, air flows in the width direction through the side area of the ridge, so that stuffiness is less likely to occur.

JP-A-2006-77888

  However, in the absorbent article of Patent Literature 1, the lower sheet is disposed between the top sheet and the absorber. Therefore, excrement remains in the hollow portion between the convex portion of the top sheet and the lower sheet, and it is difficult for the excrement to be guided to the absorber, and there is a possibility that stuffiness may not be improved. In addition, the height of the convex portion of Patent Document 1 is high, and the inclination of the side region is steep, so that the restoring force of the convex portion is weak. For this reason, there is a possibility that the body pressure of the wearer is applied, the protrusion is not restored after the crushed portion, and the stuffiness is not improved.

  The present invention has been made in view of the above-described conventional problems, and an object of the present invention is to improve stuffiness during wearing in an absorbent article having a convex portion protruding on the skin side. It is.

The main invention for achieving the above object includes a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, and the absorber and the skin side arranged closer to the skin than the absorber in the thickness direction. And an absorbent article having a plurality of linear compressed parts formed to compress the skin-side sheet in the thickness direction, and surrounded by a plurality of the linear compressed parts. In the inner region, a convex portion is formed in which the skin-side sheet protrudes toward the skin side in the thickness direction, and a void portion is formed between the non-skin side surface of the skin-side sheet and the absorber in the convex portion. Is formed, and the maximum length of the void portion in the thickness direction is smaller than the maximum thickness of the skin-side sheet in the inner region.
Other features of the present invention will be apparent from the description of the present specification and the accompanying drawings.

  ADVANTAGE OF THE INVENTION According to this invention, in the absorbent article in which the convex part protruded to the skin side is formed, the stuffiness during wearing can be improved.

It is the top view which looked at the sanitary napkin 1 from the skin side. It is the top view which looked at the napkin 1 from the non-skin side. It is a schematic sectional view of napkin 1. FIG. 3 is a schematic plan view of a top sheet 2 and an intermediate sheet 3. FIG. 2 is a schematic cross-sectional view of a top sheet 2, an intermediate sheet 3, and an absorber 10. It is explanatory drawing of the formation method of the linear pressing part Es and the convex part 20. It is a figure which shows the distribution of the fiber density of the surface sheet 2 and the intermediate sheet 3. It is a figure showing the modification of linear pressing part Es. 9A and 9B are diagrams illustrating a modification of the skin side sheets 2 and 3. FIG. FIG. 10A and FIG. 10B are diagrams illustrating a modified example of the skin side sheets 2 and 3.

At least the following matters will be made clear by the description in the present specification and the accompanying drawings.
An absorbent article comprising: a longitudinal direction, a width direction, and a thickness direction orthogonal to each other, an absorbent body, and a skin-side sheet disposed on the skin side of the absorbent body in the thickness direction. Having a plurality of linear pressing portions formed to compress the skin side sheet in the thickness direction, wherein the skin side sheet has the thickness in an inner region surrounded by a plurality of the linear pressing portions. A convex portion protruding toward the skin side in the thickness direction is formed, and in the convex portion, a gap is formed between the non-skin side surface of the skin side sheet and the absorber, and in the thickness direction The absorbent article according to claim 1, wherein a maximum length of the void is equal to or less than a maximum thickness of the skin-side sheet in the inner region.

  According to such an absorbent article, the concave portions between the convex portions serve as a ventilation path for moist air, and the like, and the stuffiness during wearing is improved. Further, when the convex portion is crushed by the wearer's body pressure, the movement of the fibers is blocked by the linear pressing portion, and the shape of the convex portion is easily maintained (high restoring force). Further, since the convex portion is relatively low and the inclination is gentle, the shape of the convex portion is easily maintained (the restoring force is high). Therefore, air permeability is maintained and stuffiness is improved.

  An absorbent article according to the present invention, wherein a plurality of the inner regions and a plurality of the protrusions are provided.

  According to such an absorbent article, stuffiness is improved over a wide range of the absorbent article.

  In such an absorbent article, the top portion of the convex portion has a high-density portion in which the fiber density of the skin-side sheet is higher than an adjacent portion adjacent to the top portion. .

  According to such an absorbent article, the shape of the convex portion is easily maintained by the high-density portion, the air permeability is maintained, and the stuffiness is improved.

  In such an absorbent article, in the high-density portion, the non-skin side portion of the skin side sheet has a higher fiber density of the skin side sheet than the skin side portion of the skin side sheet. Is an absorbent article characterized by having a high water content.

  According to such an absorbent article, the shape of the convex portion (void) is easily maintained by the high-density portion on the non-skin side surface side. On the other hand, the skin side surface can be softened, so that the skin contact with the wearer can be improved.

  In such an absorbent article, the skin-side sheet has a topsheet, and an intermediate sheet disposed on a non-skin side of the topsheet in the thickness direction, wherein the topsheet is the topsheet. Wherein the intermediate sheet contains 50% by mass or more of the heat-fusible fiber with respect to the total mass of the intermediate sheet. Absorbent article.

  According to such an absorbent article, the fiber density of the non-skin side part (intermediate sheet) can be higher than that of the skin side part (top sheet).

  In such an absorbent article, on both sides of the top in one of the longitudinal direction and the width direction, compared to the high-density portion of the top, a low-density portion where the fiber density of the skin-side sheet is low. Having, on both sides of the top in the other direction of the longitudinal direction and the width direction, the fiber density of the skin-side sheet is lower than the high-density portion of the top, and compared to the low-density portion. An absorbent article having a medium density portion in which the skin side sheet has a high fiber density.

  According to such an absorbent article, by arranging the portions having different fiber densities in the inner region, at the portion having high fiber density, the excrement is drawn into the thickness direction, and at the portion having low fiber density, The spread of excrement on the surface can be suppressed.

  In such an absorbent article, a plurality of rows of the protrusions arranged at intervals in the longitudinal direction are arranged side by side in the width direction, and a row of the protrusions adjacent in the width direction is the An absorbent article characterized in that it is arranged shifted in the longitudinal direction.

  According to such an absorbent article, since the portions having different fiber densities are dispersed and arranged in the longitudinal direction and the width direction, the excrement is placed inside the thickness direction regardless of the position in the longitudinal direction and the width direction. While being drawn in, the spread of excrement on the surface can be suppressed.

  In such an absorbent article, the center portion of the top portion has a lower fiber density of the skin-side sheet than the high-density portion of the top portion.

  According to such an absorbent article, the part that is most in contact with the wearer can be softened, and the skin contact with the wearer can be improved.

  In such an absorbent article, the plurality of linear squeezed portions are arranged apart from each other.

  According to such an absorbent article, when the convex portion is crushed by the wearer's body pressure, the moist air in the void portion passes between the linear compressed portions and easily moves to the adjacent inner region. Therefore, air permeability is improved, and stuffiness during wearing is improved.

  In such an absorbent article, the skin side surface of the skin-side sheet has a plurality of small projections smaller than the projections in the inner region.

  According to such an absorbent article, the concave portion between the small convex portions serves as a ventilation path for moist air, and stuffiness during wearing is improved.

  In such an absorbent article, the skin-side sheet has a topsheet, and an intermediate sheet disposed on a non-skin side of the topsheet in the thickness direction, wherein the absorber is an absorbent core. And a core wrap that wraps the absorbent core, wherein the water retention of the intermediate sheet is lower than the water retention of the topsheet, and the core wrap. .

  According to such an absorbent article, the excrement easily moves from the intermediate sheet to the core wrap (absorber), the intermediate sheet is unlikely to be softened by the excrement, and the shape of the convex portion (gap) is easily maintained.

  In such an absorbent article, the linear squeezed portion intersects the longitudinal direction and the width direction, respectively.

  According to such an absorbent article, the distance over which the excrement flows along the linear compressed portion can be made relatively long, and leakage in the width direction and the longitudinal direction can be suppressed.

  In such an absorbent article, the linear squeezed portion is a curved line.

  According to such an absorbent article, when the protrusions are crushed and the fibers of the skin-side sheet are blocked by the linear pressing portion, the force for compressing the fibers is dispersed, and the shape of the protrusions is maintained. It will be easier.

  In the absorbent article, in the linear pressing portion, a plurality of point pressing portions formed so as to press the skin side sheet in the thickness direction in a point shape are arranged in a line. An absorbent article characterized by the following.

  According to such an absorbent article, the point-like squeezed portion becomes a ventilation path for moist air, and stuffiness during wearing is improved.

=== embodiment ===
Hereinafter, an embodiment will be described using a sanitary napkin as an example of the absorbent article according to the present invention. However, the absorbent article is not limited to a sanitary napkin, and may be an absorbent article such as a panty liner, light incontinence pad, sanitary shorts, disposable diaper, and absorbent pad.

<< Basic configuration of sanitary napkin 1 >>
FIG. 1 is a plan view of a sanitary napkin 1 (hereinafter, referred to as “napkin”) viewed from the skin side. FIG. 2 is a plan view of the napkin 1 as viewed from the non-skin side. FIG. 3 is a schematic sectional view of the napkin 1.

  The napkin 1 has a longitudinal direction, a width direction, and a thickness direction orthogonal to each other. In the longitudinal direction of the napkin 1, the side that contacts the lower abdomen of the user is referred to as “front side”, and the side that contacts the buttocks of the user is referred to as “rear side”. Further, in the thickness direction of the napkin 1, the side in contact with the user's skin is called "skin side", and the opposite side is called "non-skin side". The napkin 1 has a pair of wings 1W extending from the center in the longitudinal direction to both outer sides in the width direction.

  The napkin 1 has a surface sheet 2, an intermediate sheet 3, an absorber 10, a back sheet 4, a wing sheet 5, and a side sheet 6 in the center in the width direction. The topsheet 2, the intermediate sheet 3, the absorber 10 and the backsheet 4 are laminated in order from the skin side in the thickness direction. Ten non-skin side faces are arranged over the widthwise ends. That is, the side sheet 6 is arranged so as to sandwich each of the members 2, 3, and 10 in the thickness direction. The top sheet 2, the intermediate sheet 3, the absorber 10, the back sheet 4, the wing sheet 5, and the side sheet 6 are respectively fixed by using an adhesive (not shown) such as a hot melt adhesive.

  The top sheet 2 is a liquid-permeable sheet member, and can be exemplified by a cotton sheet. The sheet member is not limited to the sheet member made of 100% cotton, and may be, for example, a mixed sheet of cotton and an air-through nonwoven fabric. By using cotton, which is a natural fiber, for the topsheet 2, irritation to the wearer's skin can be reduced, and it is possible to reduce the likelihood of itching and rash on the wearer's skin. Visually, the surface sheet 2 is made of a cotton sheet, giving a soft-looking impression, and enhancing the sense of quality.

  The intermediate sheet 3 is a liquid-permeable sheet member, and examples thereof include an air-through nonwoven fabric and a spunbonded nonwoven fabric. The wing sheet 5 and the side sheet 6 are each a hydrophobic sheet member, and examples thereof include an air-through nonwoven fabric and a spunbonded nonwoven fabric. The back sheet 4 is a liquid-impermeable sheet member, and may be, for example, a polyethylene (PE) resin film. The back sheet 4 has a plane size larger than that of the absorber 10 and covers the entire plane of the absorber 10.

  The wing portion 1W is formed by a wing sheet 5 and a back sheet 4 extending outward from both sides in the width direction such as the top sheet 2 on the non-skin side than the absorber 10.

  The absorber 10 is a member that absorbs excrement and holds it inside. As shown in FIG. 3, the absorber 10 has an absorbent core 11 and a core wrap 12 surrounding the absorbent core 11. The absorbent core 11 is formed into a predetermined shape by adding a liquid absorbent granular material such as a pulp fiber or a cellulosic absorbent fiber to a liquid absorbent granular material such as a super absorbent polymer (so-called SAP). Things. The core wrap 12 is a liquid-permeable sheet, such as a tissue.

  The non-skin side surface of the napkin 1 (that is, the non-skin side surface of the back sheet 4) is provided with a central adhesive portion 8 to which an adhesive is applied. In FIG. 2, the central adhesive portion 8 has eleven rectangular central adhesive portions 8 having long sides in the longitudinal direction arranged at intervals in the width direction. However, the shape, number, and The arrangement is not limited to this. When the napkin 1 is used, the central adhesive portion 8 is attached to the skin side of clothing such as underwear, so that the napkin 1 is fixed to the underwear or the like.

  Similarly, a wing adhesive portion 9 is provided on the non-skin side surface (the non-skin side surface of the back sheet 4) in the thickness direction of each wing portion 1W. In FIG. 2, four wing adhesive portions 9 each having a rectangular shape having a long side in the longitudinal direction are arranged at intervals in the width direction. And the arrangement is not limited to this. When the napkin 1 is used, the wing portion 1W is bent to the non-skin side, and the wing adhesive portion 9 is attached to a non-skin side surface such as underwear. Thereby, the wing portion 1W is fixed to the underwear or the like.

  The napkin 1 has a plurality of linear pressing portions Es, a plurality of main body pressing portions Eb, and a plurality of holes H. The plurality of linear pressing portions Es are arranged in substantially the entire region where the top sheet 2 and the intermediate sheet 3 are overlapped. As shown in FIG. 3, the linear pressed part Es is a single linear pressed part formed by pressing the top sheet 2 and the intermediate sheet 3 from the thickness direction. Specifically, it is a pressing unit having two ends, one end and the other end, and having a predetermined length in the longitudinal direction and the width direction. Due to the squeezing, the fiber density of the topsheet 2 and the fiber density of the intermediate sheet 3 are each higher than the unsqueezed portions.

  The main body squeezing portion Eb is provided in such a shape as to surround a region where the vaginal opening of the wearer is considered to be in contact in the wearing state. The main body pressing portion Eb is a pressing portion formed by pressing the topsheet 2, the intermediate sheet 3, and the absorber 10 (part or all) from the thickness direction into a desired shape. Due to the squeezing, the fiber density of the topsheet 2, the fiber density of the intermediate sheet 3, and the fiber density of the absorber 10 are each higher than the unsqueezed portion.

  The plurality of holes H are arranged substantially in a zigzag manner at the center in the longitudinal direction and the center in the width direction of the napkin 1. The hole portion H is formed by piercing a pin or the like from the skin side to the absorber 10. The depth of the hole H may be such that it penetrates through the topsheet 2 and the intermediate sheet 3 from the skin side and reaches the absorber 10.

  When a sheet using cotton having high liquid absorption and moisture retention properties is used as the top sheet 2, the excrement is diffused in the layer of the top sheet 2, and the excretion does not easily reach the intermediate sheet 3 and the absorber 10. There was a case. Therefore, by providing the linear pressed portion Es on the napkin 1 to further increase the fiber density of the top sheet 2 and the intermediate sheet 3, excrement is easily absorbed by the linear pressed portion Es by a capillary phenomenon. In other words, since the excrement received by the topsheet 2 can be easily retained by the linear pressing unit Es, the linear pressing unit Es can prevent the excrement from continuing to be superficially diffused in the layer of the topsheet 2. Therefore, it is possible to prevent the excrement from leaking from the napkin 1 or to keep the excrement from contacting the wearer's skin.

  When the spread of excrement is suppressed by the linear pressed portion Es, the amount of excrement per unit area near the portion where the linear pressed portion Es is provided increases. Therefore, by providing the hole portion H in the napkin 1, the excrement that has increased in the vicinity of the linear compressed portion Es can fall into the hole portion H. Therefore, the excrement that has entered the hole H can be absorbed by the absorber 10 before the excretion spreads over a wide range of the top sheet 2 and the intermediate sheet 3.

  Also in the main body pressing part Eb, similarly to the linear pressing part Es, it becomes easy to guide the excrement received by the top sheet 2 to the absorber 10 while keeping the excrement received by the main body pressing part Eb. Therefore, it is possible to suppress the excrement from continuing to diffuse in the layer of the topsheet 2. However, the napkin 1 shown in FIG. 1 is an example, and the napkin 1 does not need to have the hole 10 and the main body pressing part Eb.

<< About the skin side sheet >>
FIG. 4 is a schematic plan view of the top sheet 2 and the intermediate sheet 3. FIG. 5 is a schematic cross-sectional view of the topsheet 2, the intermediate sheet 3, and the absorber 10. FIG. 6 is an explanatory diagram of a method of forming the linear pressing portion Es and the convex portion 20. FIG. 7 is a diagram showing the distribution of the fiber density of the top sheet 2 and the intermediate sheet 3. FIG. 8 is a diagram illustrating a modification of the linear pressing unit Es. In the following description, the top sheet 2 and the intermediate sheet 3 arranged on the skin side of the absorber 10 in the thickness direction are also referred to as “skin side sheets”.

  The napkin 1 has a plurality of linear pressing portions Es formed so as to press the skin side sheets 2 and 3 in the thickness direction. Then, as shown in FIGS. 4 and 5, in the inner region U surrounded by the plurality of linear pressing portions Es, the convex portions 20 in which the skin side sheets 2 and 3 protrude toward the skin side in the thickness direction are formed. ing. In the convex portion 20, both the skin side surface 20a and the non-skin side surface 20b of the skin side sheets 2 and 3 project to the skin side, and the non-skin side surface 20b of the skin side sheets 2 and 3 (that is, the non-skin side surface of the intermediate sheet 3). A void portion 21 is formed between and the absorber 10.

  Thus, by providing the convex portion 20 on the napkin 1 and making the skin side surface of the napkin 1 uneven, the convex portion 20 of the skin side of the napkin 1 comes into contact with the wearer, and the gap between the convex portions 20 is formed. A space is formed between the recess and the wearer. This space serves as a ventilation path for moist air, thereby improving air permeability and improving stuffiness while wearing the napkin 1.

  Further, in the napkin 1 of the present embodiment, the linear squeezed portions Es are arranged over substantially the entire region where the topsheet 2 and the intermediate sheet 3 are overlapped, and the napkin 1 has an inner region U and a convex portion. A plurality of units 20 are provided, respectively. Therefore, stuffiness can be improved over a wide range of the napkin 1. However, the present invention is not limited to this, and one or a plurality of the inner regions U and the plurality of protrusions 20 may be provided in a part of the napkin 1.

  In addition, by making the skin side of the napkin 1 have an uneven shape, the napkin 1 visually gives an impression that the napkin 1 seems to be soft, and the napkin 1 can give the user an impression of being a high-grade product. In particular, in the napkin 1 of the present embodiment, since the respective central portions of the plurality of inner regions U have a convex shape protruding toward the skin side, the skin side surface of the napkin 1 looks like a quilted fabric. Therefore, the user can easily have an impression that the napkin 1 is soft. Further, by making the skin side surface of the napkin 1 uneven, the contact area between the napkin 1 and the wearer is reduced, so that irritation to the wearer's skin can be reduced.

  In the napkin 1, the intermediate sheet 3 also has an uneven shape together with the top sheet 2, and a gap 21 is formed between the non-skin side surface 20 b of the skin side sheets 2 and 3 and the absorber 10. Therefore, as compared with a case where a gap is formed between the topsheet 2 and the intermediate sheet 3, for example, excrement is less likely to stay between the topsheet 2 and the intermediate sheet 3, and the excrement is absorbed by the absorber 10. It will be easier. Therefore, the moisture of the skin side sheets 2 and 3 can be reduced, and the stuffiness while wearing the napkin 1 can be improved.

  In addition, since the gap 21 is formed inside the protrusion 20, when the protrusion 20 is crushed by the body pressure of the wearer, the moist air in the gap 21 is easily released to the outside. From this point, it can be said that the stuffiness during wearing of the napkin 1 can be improved.

  Further, the convex portion 20 is surrounded by a plurality of linear pressing portions Es. Therefore, when the convex part 20 is crushed by the wearer's body pressure, the movement of the fiber is blocked by the linear pressing part Es, and the set of the convex part 20 (the flattening of the convex part 20) can be suppressed. That is, even after the protrusion 20 is crushed by the body pressure of the wearer, the protrusion 20 is easily restored. Therefore, the convex portion 20 follows the movement of the wearer, and the shape of the convex portion 20 is maintained while the napkin 1 is worn, so that the air permeability is maintained.

  Further, in the napkin 1 of the present embodiment, as shown in FIG. 5, the maximum length h2 of the void portion 21 in the thickness direction of the napkin 1 (that is, from the non-skin side surface 20b of the skin side sheets 2 and 3). Of the skin side sheets 2 and 3 in the inner region U is less than or equal to the maximum thickness h1 (h2 ≦ h1).

  That is, the heights of the projections 20 and the voids 21 are relatively low, and the inclination of the projections 20 is gentle. Therefore, the restoring force of the protrusion 20 is high, and the protrusion 20 is easily restored even after the protrusion 20 is crushed by the body pressure of the wearer. Therefore, the convex portion 20 follows the movement of the wearer, and the shape of the convex portion 20 is maintained while the napkin 1 is worn, so that the air permeability is maintained. Therefore, the stuffiness during wearing of the napkin 1 can be improved.

  In other words, by not making the protrusions 20 too high, the restoring force of the protrusions 20 can be increased even if the elastic force (rigidity) of the skin side sheets 2 and 3 is weak. Therefore, the shape of the convex portion 20 can be maintained while softening the feel of the skin side sheets 2 and 3.

  In the present embodiment, the intermediate sheet 3 is disposed between the topsheet 2 and the absorber 10, but the napkin 1 without the intermediate sheet 3 may be used. In that case, a void 21 is formed between the non-skin side surface of the topsheet 2 and the absorber 10. Further, the absorber 10 may not have the core wrap 12. In that case, a void portion 21 is formed between the non-skin side surfaces of the skin side sheets 2 and 3 and the absorbent core 11.

  Moreover, although the linear pressing part Es of this embodiment squeezes only the skin side sheet | seats 2 and 3, it is not restricted to this, You may squeeze the absorber 10 (a part or all). In the present embodiment, as shown in FIG. 4, the convex portion 20 is surrounded by four linear pressed portions Es, and the inner region U has a diamond shape, but the linear pressed portion Es of the linear pressed portion Es surrounding the convex portion 20 is formed. The number and the shape of the inner region U are not limited to this.

  Further, the comparison between the maximum length h2 of the gap portion 21 in the thickness direction and the maximum thickness h1 of the skin-side sheets 2 and 3 may be performed by a known method. For example, as shown in FIG. 5, there can be exemplified a method in which cross sections obtained by cutting the skin side sheets 2, 3 and the absorber 10 in the thickness direction are visually compared based on an image enlarged by an electron microscope or the like.

In addition, using a device for measuring the length (thickness) (laser displacement meter, dial gauge type thickness gauge, etc.), for example, pressurize the target site at 3.0 gf / cm ² and actually measure and compare. Is also good. For example, when acquiring the maximum length h2 of the void portion 21, the length from the skin side surface 20 a of the skin side sheets 2 and 3 to the non-skin side surface of the absorber 10 at the apex of the projection 20 and the skin side sheet 2 , 3 and the thickness of the absorber 10 were measured, and the thickness of the skin-side sheets 2 and 3 was determined from the length from the skin side surface 20a of the skin-side sheets 2 and 3 to the non-skin side surface of the absorber 10. The thickness of the absorber 10 and the thickness of the absorber 10 may be reduced.

  Further, in FIG. 5, the skin side sheets 2 and 3 are separated from the absorber 10 at a part of the center of the inner region U, but the invention is not limited thereto. For example, the skin side sheets 2 and 3 may be separated from the absorber 10 in the entire inner region U. In this case, the maximum thickness h1 of the skin-side sheets 2 and 3 is a direction orthogonal to the surface of the skin-side sheets 2 and 3 even if the thickness of the skin-side sheets 2 and 3 in the thickness direction of the napkin 1 is set. The thickness of the skin-side sheets 2 and 3 may be as long as at least one of the thicknesses h1 is not less than the maximum length h2 of the void portion 21.

  In addition, as shown in FIG. 4, the plurality of linear pressing parts Es surrounding the convex part 20 (the inside area U) may be arranged apart from each other. That is, it is preferable that the linear compressed parts Es surrounding the convex part 20 do not have an intersection, and the linear compressed part Es and the non-compressed part N where the compressed part is not formed around the convex part 20. Should be provided.

  By doing so, when the convex portion 20 is crushed by the body pressure of the wearer, the moist air in the void portion 21 passes through the non-pressed portion N between the linear pressed portions Es, and the adjacent inner region U It is easy to move to. Thereby, the moist air in the gap portion 21 sequentially moves to the inner region U arranged in the width direction and the longitudinal direction, and is discharged to the outside of the napkin 1. Therefore, the stuffiness while wearing the napkin 1 can be further improved.

  However, the present invention is not limited to the above, and a plurality of linear pressing portions Es surrounding the convex portion 20 may be continuous as shown in FIG. Further, in FIG. 4, a plurality of (four) linear compressed parts Es surrounding the convex part 20 are all separated, but some linear compressed parts Es are separated, and another linear compressed part Es is It may be continuous.

  The skin side sheets 2 and 3 as described above can be manufactured using, for example, a pair of rollers 41 and 42 partially shown in FIG. The pair of rollers 41 and 42 rotate with the CD direction orthogonal to the material transport direction (MD direction) as the axial direction. Of the pair of rollers 41 and 42, the roller 41 on the top sheet 2 (skin side) has a projection 41A that forms a linear pressed part Es, and the roller 42 on the intermediate sheet 3 (non-skin side) , And a projection 42A forming the projection 20. Then, the top sheet 2 and the intermediate sheet 3 joined with the adhesive are passed between the pair of rollers 41 and 42 while being continuously conveyed in the MD direction. By doing so, the skin side sheets 2 and 3 on which the linear pressing portions Es and the convex portions 20 are formed are manufactured. By the way, the napkin 1 is manufactured by overlapping and joining the skin side sheets 2 and 3 to the skin side surface 10a of the absorber 10.

  As described above, the protrusions 20 are manufactured by compressing the fibers of the skin-side sheets 2 and 3 by the protrusions 42A of the rollers 42. Therefore, as shown in FIG. 5, the top part 201 of the convex part 20 has a high-density part H (fiber compression part) in which the fiber density of the skin-side sheets 2 and 3 is higher than that of the adjacent part 202 adjacent to the top part 201. Have. When the top 201 of the projection 20 has the high-density portion H, the shape of the projection 20 is easily maintained. Therefore, even while the napkin 1 is worn, the air permeability is maintained and the stuffiness is improved.

The comparison between the fiber density of the top portion 201 (high-density portion H) and the fiber density of the adjacent portion 202 may be performed by a known method. For example, using a scanning electron microscope (for example, “Real Surface View Microscope VE-7800” manufactured by KEYENCE), a section obtained by cutting the skin-side sheets 2 and 3 in the thickness direction is cut into respective portions 201 and 202 in the thickness direction. Was observed with the center at the center of the observation (i.e., the magnification was such that about 20 to 70 fiber cross sections could be observed, and usually observed at a magnification of 20 to 100 times, and in this example, at a magnification of 100 times). Observation). Next, the number of cut cross sections of the fiber per fixed area was counted. The counted number of cut sections is converted into the number of cut sections of the fiber per 1 mm ² , and this is defined as the fiber density (lines / mm ² ). The fiber density is measured at three points, and the average value is defined as the fiber density of each part. The same applies to the comparison of the fiber density of each part of the skin side sheets 2 and 3 described below.

  Further, as shown in FIG. 5, in the high-density portion H of the convex portion 20, a portion on the non-skin side surface 20 b side of the skin side sheets 2 and 3 is compared with a portion on the skin side surface 20 a side of the skin side sheets 2 and 3. It is preferable that the fiber density of the skin side sheets 2 and 3 is higher. When the skin-side sheet has the topsheet 2 and the intermediate sheet 3 as in the present embodiment, the fiber density of the intermediate sheet 3 is higher in the high-density portion H of the projection 20 than in the topsheet 2. Is preferably high.

  By increasing the fiber density and increasing the rigidity of the portion on the non-skin side surface 20b side, the shape of the void portion 21 (the convex portion 20) is easily maintained. Therefore, even while the napkin 1 is worn, the air permeability is maintained and the stuffiness is improved. On the other hand, the portion on the skin side surface 20a side is in contact with the wearer, so that the fiber density is suppressed and softened, so that the skin contact of the napkin 1 to the wearer can be improved.

  As shown in FIG. 6, in order to manufacture the skin side sheets 2 and 3 having the above fiber density relationship, as shown in FIG. 3 may be pressed to form the projection 20.

  Further, when the skin side sheet has the top sheet 2 and the intermediate sheet 3, the following is preferable. That is, the topsheet 2 contains 50% by mass or more of the non-heat-fusible fibers with respect to the total mass of the topsheet 2, and the intermediate sheet 3 has a 50% by mass or more of the total mass of the intermediate sheet 3. It is preferable to include a fusible fiber.

  By doing so, when the protrusions 20A are formed while heating the skin side sheets 2 and 3 by heating the protrusions 42A, etc., the non-heat-fusible fibers mainly constituting the topsheet 2 are melted. Difficult and less dense. For this reason, the fiber density of the topsheet 2 can be suppressed in the convex portions 20 and can be softened. On the other hand, the heat-fusible fibers mainly constituting the intermediate sheet 3 are easily melted and densely packed. Therefore, the fiber density of the intermediate sheet 3 can be increased in the convex portion 20, and the shape of the void portion 21 (convex portion 20) is easily maintained.

  In addition, examples of the non-heat-fusible fiber include natural fibers such as cotton fiber, silk fiber, and pulp fiber. Examples of the heat-fusible fibers include synthetic fibers such as polyester fibers and polypropylene fibers.

  The confirmation of the fiber ratio of each sheet may be performed by a known method. For example, it can be measured by applying the fiber mixing ratio test of JIS L 1032-2 mutatis mutandis. For example, in the case of a sheet made of cotton fibers (non-heat-fusible fibers) and synthetic fibers (heat-fusible fibers), the cotton fibers are dissolved by a dissolution method of dissolving the cotton fibers using sulfuric acid at a concentration of 70%. You can check the ratio. In addition, you may confirm by microscopy.

  As shown in FIG. 7, on both sides of the top 201 in the width direction of the napkin 1, a low-density portion L in which the fiber density of the skin-side sheets 2 and 3 is lower than the high-density portion H of the top 201 is provided. Also, on both sides of the top 201 in the longitudinal direction of the napkin 1, the fiber density of the skin-side sheets 2 and 3 is lower than the high-density part H of the top 201, and the skin-side sheet 2 is lower than the low-density part L. It is preferable that a medium density portion M having a high fiber density is provided.

  In the region where the fiber density is high, the excrement is absorbed into the thickness direction (absorber 10) by capillary action, and the excrement is easily diffused on the surface of the skin-side sheets 2 and 3. On the other hand, in a portion where the fiber density is low, the diffusion speed on the surface of the skin side sheets 2 and 3 can be suppressed. Therefore, by disposing the portions H, M, and L having different fiber densities in the inner region U, it is possible to suppress the diffusion on the surface while drawing the excrement into the inside in the thickness direction. Therefore, leakage of excrement from the napkin 1 can be suppressed.

  Furthermore, as shown in FIG. 7, it is preferable that the convex portions 20 (high-density portions H) are arranged in a staggered manner. That the protrusions 20 are arranged in a staggered manner means that a plurality of rows (for example, L1 to L3) of the protrusions 20 arranged at intervals in the longitudinal direction are arranged in the width direction and are adjacent to each other in the width direction. This means that the rows of the convex portions (for example, L1 and L2 or L2 and L3) are arranged to be shifted in the longitudinal direction.

  On the other hand, for example, as shown in FIG. 8, when the positions of the protrusions 20 in the longitudinal direction and the width direction are aligned, the medium density portions M of the adjacent inner regions U are lined up or the adjacent inner regions The low-density portions L of U may be lined up.

  On the other hand, as shown in FIG. 7, when the protrusions 20 are arranged in a staggered manner, the low-density portion L of the adjacent inner region U is located near the middle-density portion M of a certain inner region U. For example, the density portions H, M, and L are dispersed in the longitudinal direction and the width direction. Therefore, regardless of the position in the longitudinal direction and the width direction, it is possible to suppress the diffusion of the excrement on the surface in the region where the fiber density is low while drawing the excrement into the region in the thickness direction where the fiber density is high. it can.

  When the skin-side sheets 2 and 3 are manufactured using the pair of rollers 41 and 42 illustrated in FIG. 6, the skin-side sheets 2 and 3 are stretched in the CD direction when the protrusions 20 are formed. Therefore, low-density portions L are formed on both sides of the high-density portion H of the convex portion 20 in the CD direction, and medium-density portions M are formed on both sides of the high-density portion H of the convex portion 20 in the MD direction (transport direction). . Therefore, when adjusting the CD direction at the time of manufacturing the skin side sheets 2 and 3 to the width direction of the napkin 1, the low density portions L are formed on both sides of the high density portion H in the width direction of the napkin 1 as shown in FIG. Provided. However, the direction may be reversed, and the MD direction at the time of manufacturing the skin side sheets 2 and 3 may be matched with the longitudinal direction of the napkin 1. In that case, low-density portions L are provided on both sides of the high-density portion H in the longitudinal direction of the napkin 1, and medium-density portions M are provided on both sides of the high-density portion H in the width direction of the napkin 1.

  When the skin-side sheet has the topsheet 2 and the intermediate sheet 3, the water retention (liquid retention) of the intermediate sheet 3 is lower than the water retention of the topsheet 2 and the core wrap 12. preferable.

  By doing so, after the excrement moves to the intermediate sheet 3, the excrement easily moves to the core wrap 12 (the absorber 10), and the excrement hardly stays in the intermediate sheet 3. Therefore, it is possible to prevent the intermediate sheet 3 from being softened by excrement and the void portion 21 (the convex portion 20) from being easily crushed. Therefore, the shape of the convex portion 20 is easily maintained, and the breathability is maintained even while the napkin 1 is worn, and the stuffiness is improved.

  The comparison of the water retention of the sheets 2, 3, and 12 may be performed by a known method. For example, a sample is prepared by cutting each of the sheets 2, 3, and 12 into a predetermined size, and the weight of each sample is measured. Then, each sample is placed on a wire mesh and immersed in a tray containing a liquid (for example, artificial menstrual blood) for a predetermined time (for example, 3 minutes). Thereafter, the sample is pulled up together with the wire netting, the liquid of each sample is cut lightly, and left for a predetermined time (for example, 5 minutes). At this time, the weight of each sample is measured, and the weight of each sample measured first is subtracted to calculate the water retention amount for each sample. Thereafter, a weight (for example, 840 grams) is placed on each sample and left for a predetermined time (for example, 3 minutes). At this time, the weight of each sample is measured, and the weight of each sample measured first is subtracted to calculate the water retention amount for each sample. The difference in the water retention of each sample before and after placing the weight is calculated, and the larger the difference, the lower the water retention.

  Moreover, as shown in FIG. 4, it is preferable that the linear pressing parts Es are arranged in an oblique shape that intersects the longitudinal direction and the width direction, respectively. Since the fiber density is high in the linear pressed part Es, the excrement is easily diffused along the linear pressed part Es by a capillary phenomenon. Therefore, as shown in FIG. 8, the linear compressed portion Es extends along the longitudinal direction and the width direction, and the linear compressed portion Es has an oblique shape as compared with a case where excrement is linearly diffused. The more the excrement spreads obliquely, the longer the excretion diffusion distance. Therefore, it becomes difficult for the excrement to reach the edge of the napkin 1, and leakage of the excrement from the napkin 1 can be suppressed.

  Moreover, as shown in FIG. 4, it is preferable that the linear pressing part Es is a curve. As described above, when the convex portion 20 is crushed by the body pressure of the wearer, the movement of the fiber is blocked by the linear pressing portion Es. Therefore, compared to the case where the linear compressed portion Es is a straight line, the curved line is easier to disperse the force of compressing the fiber when the convex portion 20 is crushed, and the sag of the convex portion 20 (the convex portion 20). Flattening) can be suppressed. Therefore, the shape of the convex portion 20 is easily maintained, the air permeability is maintained even while the napkin 1 is worn, and the stuffiness is improved.

  In addition, when the linear pressing portion Es is curved, the linear pressing portion Es is less likely to be a starting point of the napkin 1 than when the linear pressing portion Es is a straight line. Therefore, it is possible to suppress the occurrence of a gap between the napkin 1 and the wearer due to the folding of the napkin 1.

  In addition, the linear pressing part Es may extend along the longitudinal direction and the width direction, or may be a straight line. In addition, the linear pressed portion Es illustrated in FIG. 4 has a curved portion that is convex on one side in a direction orthogonal to the linear pressed portion Es and a curved portion that is convex on the other side, and has a meandering shape. However, the curved shape of the linear pressing part Es is not limited to this.

  As shown in FIG. 4, in the linear pressing portion Es, a plurality of point pressing portions Et formed so as to press the skin side sheets 2 and 3 in a point-wise manner in the thickness direction are linearly arranged. Preferably. By doing so, in the linear pressing part Es, the point pressing part Et serves as a ventilation path for moist air, the air permeability is improved, and the stuffiness during wearing of the napkin 1 can be improved. In addition, since the portions where the skin-side sheets 2 and 3 are hardened by the pressing can be reduced, the skin contact of the napkin 1 to the wearer can be improved. However, the present invention is not limited to the above, and the linear pressing portion Es may be a linear pressing portion having a groove shape.

<< About the modification of the skin side sheet >>
9A and 9B are diagrams illustrating a modification of the skin-side sheets 2 and 3. FIG. 9A is a schematic cross-sectional view of the protrusion 20, and FIG. 9B shows a part of a pair of rollers 41 and 43 forming the skin-side sheets 2 and 3.

  As shown in FIG. 9A, the central part 201A of the top part 201 of the convex part 20 of the skin side sheets 2 and 3 is closer to the skin side than the high-density part H of the top part 201 (specifically, around the central part 201A). The fiber density of the sheets 2 and 3 may be low.

  By doing so, it is possible to soften the central portion 201A of the top portion 201 that comes into most contact with the wearer, and to improve the skin contact of the napkin 1 with the wearer.

  The skin side sheets 2 and 3 as described above can be manufactured using, for example, a pair of rollers 41 and 43 shown in FIG. 9B. Of the pair of rollers 41, 43, one roller 41 has a projection 41A that forms the linear pressing portion Es, and the other roller 43 has a projection 43A that forms the projection 20. The central portion of the projection 43A of the other roller 43 has a recess 43B. Therefore, when the skin-side sheets 2 and 3 are pressed from the non-skin side in order to form the protrusions 20, the portions of the skin-side sheets 2 and 3 that are in contact with the recesses 43B are less likely to be compressed. Density is reduced.

  FIG. 10A and FIG. 10B are diagrams illustrating a modified example of the skin side sheets 2 and 3. FIG. 10A is a schematic sectional view of the skin side sheets 2 and 3, and FIG. 10B shows a part of a pair of rollers 51 and 52 forming the top sheet 2.

  As shown in FIG. 10A, in the inner region U surrounded by the fiber compression portions Es, the skin side surfaces of the skin-side sheets 2 and 3 may have a plurality of small convex portions 22 having smaller irregularities than the convex portions 20. Good. As described above, the skin side surfaces of the skin side sheets 2 and 3 have a fine uneven shape, so that the concave portion between the small convex portions 22 serves as a ventilation path for moist air, the air permeability is improved, and the napkin 1 is worn. Can improve stuffiness. In addition, since the contact area between the napkin 1 and the wearer is reduced, irritation to the wearer's skin can be reduced.

  The skin side sheets 2 and 3 as described above can be manufactured using, for example, a pair of rollers 51 and 52 shown in FIG. 10B. The pair of rollers 51 and 52 have protrusions 51A and 52A forming the small protrusion 22, respectively. First, the topsheet 2 is passed between the pair of rollers 51 and 52. By doing so, the small convex portions 22 are formed on the skin side surface of the topsheet 2. By passing the surface sheet 2 joined to the intermediate sheet 3 between the pair of rollers 41 to 43 shown in FIG. 6 and FIG. 9B described above, the skin side on which the linear pressed part Es and the convex part 20 are formed Sheets 2 and 3 are manufactured.

  In FIG. 10A, both the skin side surface and the non-skin side surface of the topsheet 2 are irregularly shaped, but the invention is not limited to this. For example, only the skin side of the topsheet 2 may be unevenly shaped, or the intermediate sheet 3 may be unevenly shaped together with the topsheet 2. In addition, the method of forming the concavo-convex shape is not limited to the method illustrated in FIG. 10B. For example, the concavo-convex shape may be formed by spraying a fluid onto the fibrous web at the time of manufacturing the topsheet 2.

  The shape, number, and arrangement of the small projections 22 can be variously changed. For example, a plurality of small protrusions 22 extending along the longitudinal direction may be arranged in the width direction, or a plurality of small protrusions 22 extending along the width direction may be arranged in the longitudinal direction. Further, small convex portions 22 (for example, small circular convex portions 22 having a flat circular shape) having the same length in the longitudinal direction and the width direction may be dispersedly arranged in the longitudinal direction and the width direction.

  As described above, the embodiments of the present invention have been described. However, the above embodiments are for facilitating understanding of the present invention, and are not intended to limit and interpret the present invention. Further, the present invention can be changed and improved without departing from the gist thereof, and it goes without saying that the present invention includes equivalents thereof.

1 napkin (absorbent article),
2 surface sheet (skin side sheet), 3 intermediate sheet (skin side sheet),
4 back sheet, 5 wing sheet,
6 side seats,
8 center adhesive part, 9 wing adhesive part,
10 absorber, 11 absorbent core, 12 core wrap,
20 convex part, 201 top part, 202 adjacent part,
21 void portion, 22 small convex portion,
41 rollers, 42 rollers, 43 rollers,
51 rollers, 52 rollers,
Es linear pressing part, Et point pressing part,
Eb Squeezed part, H hole,
H high density part, M medium density part, L low density part,

Claims (14)

With a longitudinal direction, a width direction, and a thickness direction orthogonal to each other,
An absorber,
In the thickness direction, a skin-side sheet disposed closer to the skin than the absorber,
An absorbent article having
The skin-side sheet has a plurality of linear pressing portions formed to be pressed in the thickness direction,
In the inner region surrounded by the plurality of linear pressing portions, a convex portion is formed in which the skin-side sheet projects toward the skin side in the thickness direction,
In the convex portion, a void portion is formed between the non-skin side surface of the skin-side sheet and the absorber,
The maximum length of the gap in the thickness direction is equal to or less than the maximum thickness of the skin-side sheet in the inner region.
An absorbent article characterized by the following. The absorbent article according to claim 1, wherein
An absorbent article, wherein a plurality of the inner regions and a plurality of the protrusions are provided. It is an absorbent article according to claim 2,
An absorptive article, wherein the top of the convex portion has a high-density portion in which the fiber density of the skin-side sheet is higher than an adjacent portion adjacent to the top. The absorbent article according to claim 3, wherein
In the high-density portion, the fiber density of the skin-side sheet is higher in the non-skin-side portion of the skin-side sheet than in the skin-side portion of the skin-side sheet. Absorbent article. The absorbent article according to claim 4,
The skin-side sheet has a topsheet, and an intermediate sheet arranged on the non-skin side of the topsheet in the thickness direction,
The topsheet contains 50% by mass or more of non-heat-fusible fibers based on the total mass of the topsheet,
An absorbent article, wherein the intermediate sheet contains 50% by mass or more of heat-fusible fibers with respect to the total mass of the intermediate sheet. It is an absorbent article according to any one of claims 3 to 5,
On both sides of the top portion in one of the longitudinal direction and the width direction, compared to the high-density portion of the top portion, has a low-density portion where the fiber density of the skin-side sheet is low,
On both sides of the top in the other direction of the longitudinal direction and the width direction, the fiber density of the skin-side sheet is lower than the high-density part of the top, and the skin-side sheet is lower than the low-density part. An absorbent article having a medium-density portion in which the sheet has a high fiber density. The absorbent article according to claim 6, wherein
A plurality of rows of the protrusions arranged at intervals in the longitudinal direction are arranged side by side in the width direction,
An absorbent article, wherein the rows of the protrusions adjacent to each other in the width direction are arranged so as to be shifted in the longitudinal direction. The absorbent article according to any one of claims 3 to 7, wherein
An absorbent article, wherein a fiber density of the skin-side sheet is lower in a central portion of the top portion than in a high-density portion of the top portion. It is an absorbent article according to any one of claims 2 to 8,
An absorbent article, wherein the plurality of linear squeezed portions are arranged apart from each other. It is an absorbent article according to any one of claims 2 to 9,
An absorbent article wherein the skin side surface of the skin-side sheet has a plurality of small projections smaller than the projections in the inner region. The absorbent article according to any one of claims 2 to 10, wherein
The skin-side sheet has a topsheet, and an intermediate sheet arranged on the non-skin side of the topsheet in the thickness direction,
The absorber has an absorbent core and a core wrap that surrounds the absorbent core,
An absorbent article, wherein the water retention of the intermediate sheet is lower than the water retention of the top sheet and the water retention of the core wrap. It is an absorbent article according to any one of claims 2 to 11,
The said linear pressing part cross | intersects the said longitudinal direction and the said width direction, respectively, The absorbent article characterized by the above-mentioned. It is an absorbent article according to any one of claims 2 to 12,
The said linear pressing part is a curve, The absorbent article characterized by the above-mentioned. It is an absorbent article according to any one of claims 2 to 13,
In the linear pressing part, the plurality of point pressing parts formed so as to press the skin side sheet in the thickness direction in a point shape are arranged in a line.

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