CN111787894B - Absorbent article - Google Patents

Absorbent article Download PDF

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Publication number
CN111787894B
CN111787894B CN202080001344.8A CN202080001344A CN111787894B CN 111787894 B CN111787894 B CN 111787894B CN 202080001344 A CN202080001344 A CN 202080001344A CN 111787894 B CN111787894 B CN 111787894B
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CN
China
Prior art keywords
sheet
temperature
absorbent article
skin
absorber
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Application number
CN202080001344.8A
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Chinese (zh)
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CN111787894A (en
Inventor
山本成海
林俊久
内田祥平
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Unicharm Corp
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Unicharm Corp
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Publication of CN111787894A publication Critical patent/CN111787894A/en
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    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61F—FILTERS IMPLANTABLE INTO BLOOD VESSELS; PROSTHESES; DEVICES PROVIDING PATENCY TO, OR PREVENTING COLLAPSING OF, TUBULAR STRUCTURES OF THE BODY, e.g. STENTS; ORTHOPAEDIC, NURSING OR CONTRACEPTIVE DEVICES; FOMENTATION; TREATMENT OR PROTECTION OF EYES OR EARS; BANDAGES, DRESSINGS OR ABSORBENT PADS; FIRST-AID KITS
    • A61F13/00—Bandages or dressings; Absorbent pads
    • A61F13/15—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators
    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/472—Sanitary towels, incontinence pads or napkins specially adapted for female use
    • A61F13/47263—Sanitary towels, incontinence pads or napkins specially adapted for female use with activating means, e.g. elastic, heat or chemical activatable means
    • A—HUMAN NECESSITIES
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    • A61F13/00—Bandages or dressings; Absorbent pads
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    • A—HUMAN NECESSITIES
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    • A—HUMAN NECESSITIES
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    • A61F13/45—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the shape
    • A61F13/47—Sanitary towels, incontinence pads or napkins
    • A61F13/475—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means
    • A61F13/4751—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction
    • A61F13/4752—Sanitary towels, incontinence pads or napkins characterised by edge leakage prevention means the means preventing fluid flow in a transversal direction the means being an upstanding barrier
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    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
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    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
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    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/531—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium having a homogeneous composition through the thickness of the pad
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    • A61F13/53—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium
    • A61F13/539—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers
    • A61F2013/53908—Absorbent pads, e.g. sanitary towels, swabs or tampons for external or internal application to the body; Supporting or fastening means therefor; Tampon applicators characterised by the absorbing medium characterised by the connection of the absorbent layers with each other or with the outer layers with adhesive

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Abstract

Provided is an absorbent article having a temperature-sensitive portion, wherein the effect of enabling a wearer to continuously perceive warmth, that is, the sustainability of the temperature-sensitive portion, can be improved. An absorbent article includes: an absorber (11); a 1 st sheet member (7) which is positioned closer to the skin than the absorber and has liquid permeability; and a 2 nd sheet member (9) which is located on the non-skin side of the absorber and has liquid impermeability. At least one of the absorber and the 1 st sheet member is provided with a temperature-sensitive portion containing a temperature-sensitive agent (52, 51). The 1 st sheet member includes a plurality of sheet member recesses (67) in a region overlapping the temperature sensitive portion in a plan view. The absorber includes a plurality of absorber recesses (60) recessed from the skin-side surface toward the non-skin-side surface at positions different from the plurality of sheet member recesses in a region overlapping the temperature sensitive portion in a plan view. The 2 nd sheet member is non-breathable.

Description

Absorbent article
Technical Field
The present invention relates to an absorbent article.
Background
An absorbent article is known which includes a temperature sensitive portion having a temperature sensitive agent for making a wearer of the absorbent article feel a temperature via the skin. For example, patent document 1 discloses an absorbent article in which a medicine capable of imparting a sensation to a wearer without creating an external condition to be perceived by the wearer is incorporated in one or more portions. In patent document 1, a cooling agent (a cooling agent) and a heating agent (a temperature sensing agent) are listed as the chemical agent.
Documents of the prior art
Patent document
Patent document 1: japanese Kokai publication Hei-2004-528090
Disclosure of Invention
Problems to be solved by the invention
In the absorbent article in which the temperature sensitive agent is disposed as in patent document 1, even if the temperature sensitive agent reaches the skin of the wearer and the wearer feels warmth, there are cases where excrement (for example, urine and menstrual blood) adheres to the skin and where an absorbent body that absorbs the excrement and has a reduced temperature contacts the skin via a topsheet or the like. In this case, the temperature sensitive agent is difficult to reach the skin due to the excrement, or the skin is cooled due to the absorber whose temperature is lowered, and the wearer may have difficulty in continuously sensing the warmth of the temperature sensitive agent. Thus, there is room for improvement in the durability of the absorbent article of patent document 1 in which the wearer continuously senses a temperature sensation such as warmth.
Accordingly, an object of the present invention is to provide an absorbent article having a temperature sensitive portion, in which the effect of enabling a wearer to continuously perceive warmth, that is, the sustainability of the temperature sensation can be improved.
Means for solving the problems
An absorbent article according to the present invention is an absorbent article having a longitudinal direction, a width direction, and a thickness direction, the absorbent article including: an absorbent body; a 1 st sheet member that is superposed on the absorber in the thickness direction, is positioned closer to the skin than the absorber, and has liquid permeability; and a 2 nd sheet member that is overlapped with the absorber in the thickness direction, is positioned on a non-skin side of the absorber, and has liquid impermeability, wherein at least one of the absorber and the 1 st sheet member includes a temperature sensitive portion containing a temperature sensitive agent, a region of the 1 st sheet member overlapped with the temperature sensitive portion in a plan view includes a plurality of sheet member recesses recessed from a skin side surface toward the non-skin side surface, a position of the absorber in a region overlapped with the temperature sensitive portion in a plan view different from the plurality of sheet member recesses includes a plurality of absorber recesses recessed from the skin side surface toward the non-skin side surface, and the 2 nd sheet member is air impermeable.
ADVANTAGEOUS EFFECTS OF INVENTION
According to the present invention, it is possible to provide an absorbent article having a temperature sensitive portion, in which the effect of enabling a wearer to continuously perceive warmth, that is, the sustainability of the temperature sensation can be improved.
Drawings
Fig. 1 is a plan view showing a configuration example of a sanitary napkin according to an embodiment.
Fig. 2 is a sectional view along a longitudinal center line of fig. 1.
Fig. 3 is a bottom view showing a configuration example of the sanitary napkin according to the embodiment.
Fig. 4 is a plan view showing a configuration example of the liquid-permeable sheet according to the embodiment.
Fig. 5 is a sectional view taken along line V-V of fig. 4.
Fig. 6 is a plan view showing a configuration example of the absorber of the embodiment.
Fig. 7 is a sectional view taken along line VII-VII of fig. 6.
Fig. 8 is a schematic diagram showing the arrangement of the temperature sensitive agent of the absorber of the embodiment.
Fig. 9 is a schematic view showing the arrangement of the temperature sensitive agent in the liquid-permeable sheet according to the embodiment.
Fig. 10 is a cross-sectional view of a sanitary napkin according to another embodiment taken along the widthwise centerline.
Fig. 11 is a cross-sectional view of a sanitary napkin according to yet another embodiment taken along the widthwise centerline.
Detailed Description
Specifically, the present disclosure relates to the following aspects.
[ solution 1]
An absorbent article having a longitudinal direction, a width direction, and a thickness direction, the absorbent article comprising: an absorbent body; a 1 st sheet member that is superposed on the absorber in the thickness direction, is positioned closer to the skin than the absorber, and has liquid permeability; and a 2 nd sheet member that is overlapped with the absorber in the thickness direction, is positioned on a non-skin side of the absorber, and has liquid impermeability, wherein at least one of the absorber and the 1 st sheet member includes a temperature sensitive portion containing a temperature sensitive agent, a region of the 1 st sheet member overlapped with the temperature sensitive portion in a plan view includes a plurality of sheet member recesses recessed from a skin side surface toward the non-skin side surface, a position of the absorber in a region overlapped with the temperature sensitive portion in a plan view different from the plurality of sheet member recesses includes a plurality of absorber recesses recessed from the skin side surface toward the non-skin side surface, and the 2 nd sheet member is air impermeable.
In the absorbent article of the present invention, when the absorbent article is worn on a wearer, a temperature-sensitive effect that allows the wearer to perceive warmth can be obtained by the temperature-sensitive agent of at least one of the absorber and the 1 st sheet member. In this case, since the 1 st sheet member includes the plurality of sheet member recesses, at least a part of the air warmed by the temperature sensing effect can be held by the dimples of the plurality of sheet member recesses. Further, since the absorber includes a plurality of absorber recesses, at least a part of the air warmed by the temperature sensing effect can be held by the dimples of the plurality of absorber recesses. Here, since the sheet member recesses and the absorber recesses are shifted in position from each other, a large amount of warmed air can be retained when the plurality of sheet member recesses and the plurality of absorber recesses are combined. Further, the air held by the second sheet member 2, which is located on the non-skin side of the absorber and the first sheet member 1 and is air-impermeable, can be substantially confined to the skin side so as not to flow out to the outside. Thus, in addition to the temperature-sensitive effect obtained by the temperature-sensitive agent, even when the temperature-sensitive agent is difficult to reach the skin due to excrement or the absorber temperature is lowered, the skin can be kept warm by the warmed air, and the temperature-sensitive effect can be obtained. This can improve the persistence of the temperature sensation.
[ solution 2]
The absorbent article according to claim 1, wherein the absorbent body has an excretory opening abutment region that is a region in abutment with an excretory opening of a wearer and a non-excretory opening abutment region that is a region other than the excretory opening abutment region, and the density of the number of arrangements of the absorbent body recesses in the excretory opening abutment region is higher than the density of the number of arrangements of the absorbent body recesses in the non-excretory opening abutment region.
In the absorbent article, the density of the number of absorbent body recesses arranged in the excretory opening contact region is made higher than the density of the number of absorbent body recesses arranged in the non-excretory opening contact region. Therefore, when the absorbent article is worn on the wearer, more warmed air can be retained in the excretory opening contact region. Therefore, the skin around the excretory opening, which is sensitive and therefore susceptible to temperature changes, can be kept warm. This can further improve the persistence of the temperature sensation.
[ solution 3]
The absorbent article according to claim 1 or 2, wherein a thickness of a central portion in the width direction of the absorbent body is thinner than thicknesses of both end portions in the width direction of the absorbent body.
In the absorbent article, the thickness of the central portion in the width direction of the absorbent body is made thinner than the thickness of both end portions located on both sides of the central portion. Therefore, when the absorbent article is worn by a wearer and both end portions (via the sheet member) in the width direction of the absorbent body are in contact with the skin, some gap can be easily generated between the central portion of the absorbent body and the skin. In addition, the warmed air can be further retained in the gap. Therefore, the skin in the vicinity of the excretory opening, which may come into contact with the central portion of the absorbent body and is sensitive and therefore susceptible to temperature changes, can be kept warm. This can further improve the persistence of the temperature sensation.
[ solution 4]
The absorbent article according to any one of claims 1 to 3, wherein the 1 st sheet member includes: a surface sheet; and a liquid diffusion sheet that is in contact with a non-skin side of the front sheet, wherein each of the plurality of sheet member concave portions includes a compressed portion that is compressed from a skin-side surface of the front sheet toward a non-skin-side surface of the liquid diffusion sheet so as to integrate the front sheet and the liquid diffusion sheet.
In the present absorbent article, the sheet member recess includes a compressed portion that integrates the surface sheet and the liquid diffusion sheet that are in contact with each other. In other words, the surface sheet and the liquid diffusion sheet are bonded to each other by the plurality of compressed portions, but the portions other than the compressed portions are not bonded. Therefore, when the absorbent article is worn on the wearer, the front sheet and the liquid diffusion sheet can be separated from each other in the thickness direction between the adjacent (not closest) compressed parts, and some gaps are likely to be generated. In addition, the warmed air can be further retained in the gap. Therefore, not only the plurality of sheet member recesses but also the skin can be kept warm by the warmed air in the gaps. This can further improve the persistence of the temperature sensation.
[ solution 5]
The absorbent article according to any one of claims 1 to 4, wherein the 1 st sheet member includes: a surface sheet formed of a nonwoven fabric; and an auxiliary sheet that is in contact with the non-skin side of the top sheet and is formed of a nonwoven fabric, wherein the fiber density of the top sheet is lower than the fiber density of the auxiliary sheet.
In the absorbent article of the present invention, the fiber density of the top sheet is lower than the fiber density of the auxiliary sheet in contact with the non-skin side. Therefore, the auxiliary sheet having a high fiber density can stably suppress the return of the excrement of the absorbent body to the topsheet side, and can further retain the air warmed by the temperature-sensitive effect in the gaps between the fibers of the topsheet having a low fiber density. This can further improve the persistence of the temperature sensation.
[ solution 6]
The absorbent article according to any one of claims 1 to 5, wherein the 1 st sheet member includes: a surface sheet; and a pair of side sheets joined to both sides of the front sheet in the width direction, wherein a leakage preventing wall extending in the longitudinal direction is included at each of inner end portions of the pair of side sheets in the width direction or each of both end portions of the front sheet in the width direction, the leakage preventing wall has an outer end edge as a fixed end and an inner end edge as a free end in the width direction, and the temperature sensitive portion is located in a region overlapping the front sheet in a plan view.
In the absorbent article, a pair of leakage preventing walls are provided on both sides of the top sheet in the width direction. Therefore, when the absorbent article is worn on the wearer, some space can be easily created by the pair of leakage preventing walls and the topsheet when the pair of leakage preventing walls are in a state of slightly rising toward the skin. In addition, the warmed air can be further retained in the space. This allows the skin to be kept warm by the warmed air in the space, in addition to the plurality of sheet member concave portions and the plurality of absorber concave portions. This can further improve the persistence of the temperature sensation.
[ solution 7]
The absorbent article according to claim 6, further comprising a front temperature-sensitive portion that is located on a front side in the longitudinal direction of the absorbent body and contains a temperature-sensitive agent, wherein one surface of the front temperature-sensitive portion is in contact with the top sheet and the pair of side sheets, and the other surface is in contact with the 2 nd sheet member.
The absorbent article further includes a front temperature-sensitive portion containing a temperature-sensitive agent, which is located on the front side in the longitudinal direction of the absorbent body, i.e., on the abdominal side of the wearer. Therefore, when the absorbent article is worn on the wearer, the wearer's abdominal portion can be warmed by the temperature sensitive agent. Further, since the pair of leakage preventing walls extend to the front temperature sensitive portion, some space can be easily created even in the portion on the abdominal side of the wearer by the pair of leakage preventing walls and the surface sheet. In addition, the warmed air can be held in the space. This allows the skin to be kept warm by the warmed air in the abdomen-side portion of the wearer in the space, in addition to the plurality of sheet member concave portions and the plurality of absorber concave portions. This can further improve the persistence of the temperature sensation.
[ solution 8]
The absorbent article according to claim 6 or 7, wherein the leakage preventing wall has a structure in which two or more sheets are stacked.
In the absorbent article, the leakage preventing wall has a structure in which two or more sheet members are stacked. Therefore, when the absorbent article is worn on a wearer, it is possible to make it more difficult for air held in the space created between the pair of leakage preventing walls and the top sheet and the space created between the two or more sheet members to be released outward. In addition, the warmed air can be further retained in these spaces as well as in the plurality of sheet member concave portions and the plurality of absorber concave portions. This allows the skin to be kept warm by the warmed air. This can further improve the persistence of the temperature sensation.
[ solution 9]
The absorbent article according to any one of claims 1 to 8, wherein the temperature-sensitive portion contains the temperature-sensitive agent and a durable hydrophilic oil agent.
In the absorbent article, the temperature-sensitive agent and the durable hydrophilic oil agent having a characteristic of being less likely to flow out to the lower layer (exemplified: the absorbent body and the lower part of the absorbent body) due to excrement coexist. Therefore, the temperature sensitive agent can be prevented from being transferred to the lower layer by the excrement. That is, the temperature sensitive agent can be maintained relatively close to the skin. This can further improve the persistence of the temperature sensation.
[ solution 10]
The absorbent article according to any one of claims 1 to 9, wherein the 1 st sheet member is a warm air nonwoven fabric, the warm air nonwoven fabric is disposed such that a web surface facing a web for conveyance during production faces the skin side, a non-web surface opposite to the web surface faces the non-skin side, and the temperature sensitive portion is disposed on the non-web surface.
In the air-through nonwoven fabric, the gaps between the constituent fibers of the non-web surface are large. Therefore, in the present absorbent article, the temperature sensitive agent can be easily held in the gaps between the constituent fibers by disposing the temperature sensitive portion on the non-net surface, and thus the temperature sensitive agent can be released continuously, and the durability of the temperature can be further improved. Further, after the temperature sensitive agent is consumed or the temperature sensitive agent flows out due to the excrement, the warmed air can be further held in the gap. This can further improve the persistence of the temperature sensation.
[ solution 11]
The absorbent article according to any one of claims 1 to 10, wherein the 1 st sheet member is a surface sheet, and the surface sheet is formed of hydrophilic fibers.
In the absorbent article of the present invention, the top sheet is made of hydrophilic fibers (exemplified by cotton, rayon, wool, and silk), and therefore moisture including sweat can be taken in and retained in the constituent fibers. This makes it possible to prevent moisture from remaining on the surface of the constituent fibers, to prevent moisture from coming into contact with the skin, and to prevent the skin from feeling cold. This can further improve the persistence of the temperature sensation.
[ solution 12]
The absorbent article according to any one of claims 1 to 11, wherein the absorbent body comprises a super absorbent polymer, and the proportion of the super absorbent polymer to the absorbent body is 5 to 50% by mass.
In the absorbent article, the proportion of the super absorbent polymer to the absorbent body is set to 5 to 50 mass%. By setting the ratio of the super absorbent polymer to the absorbent body to a predetermined range in this manner, when the super absorbent polymer absorbs excrement and swells, a gap can be formed between adjacent swollen super absorbent polymers. Therefore, the air warmed by the temperature sensing effect can be further retained in the gap. This can further improve the persistence of the temperature sensation. When the proportion is less than 5% by mass, voids generated during swelling are small, and it is difficult to hold warmed air, and when the proportion is more than 50% by mass, a gel blocking phenomenon occurs due to the super absorbent polymer, resulting in a decrease in the absorption performance of the absorbent article.
[ solution 13]
The absorbent article according to any one of claims 1 to 12, wherein the weight per unit area of the 2 nd adhesive bonding the 2 nd sheet member and the absorbent body is larger than the weight per unit area of the 1 st adhesive bonding the 1 st sheet member and the absorbent body.
In the absorbent article, the weight per unit area of the 2 nd adhesive for bonding the 2 nd sheet member and the absorbent body is increased. Although the 2 nd sheet member is air-impermeable, it may have some air-permeability, but the 2 nd sheet member can be further improved in air-impermeability because the 2 nd adhesive has a relatively large weight per unit area, and the gaps related to air permeability in the 2 nd sheet member can be covered. Therefore, the air warmed by the temperature sensing effect can be more stably held at the skin side than the 2 nd sheet member. This can further improve the persistence of the temperature sensation.
[ solution 14]
The absorbent article according to any one of claims 1 to 13, further comprising a pair of longitudinal folding lines disposed on both sides with respect to a longitudinal center line of the absorbent article, extending in the longitudinal direction, and arranged at intervals in the width direction, wherein when the absorbent article is folded and individually packaged, a portion of the absorbent article on the outer side of the pair of longitudinal folding lines in the width direction is folded toward a skin-side surface of the absorbent article with the pair of longitudinal folding lines as a base axis.
In the present absorbent article, when folded, the portion of the absorbent article that is outside the pair of longitudinal folding lines in the width direction is folded toward the skin-side surface of the absorbent article with the pair of longitudinal folding lines as the base axis. Therefore, in the absorbent article, the fold line is formed at the position of the pair of longitudinal folding lines, and the portion outside the pair of longitudinal folding lines (the pair of outer portions) is likely to rise toward the skin. Therefore, when the absorbent article is worn, the pair of outer portions is pushed against the skin surface in an attempt to rise in the width direction, and the central portion inside the pair of outer portions is likely to be slightly separated from the skin surface. That is, a gap is easily generated between the skin surface and the central portion. Therefore, the air warmed by the temperature sensing effect can be further retained in the gap. This can further improve the persistence of the temperature sensation.
[ solution 15]
The absorbent article according to any one of claims 1 to 14, wherein the absorbent article comprises: an absorbent body including the absorbent body; and a temperature-sensitive body containing a temperature-sensitive agent and located on the front side of the absorption body in the longitudinal direction.
Even if the body temperature rises due to the temperature sensitive agent, if there is excrement, the excrement is cooled by the outside air temperature or the heat of vaporization, and the cooled excrement adheres to the skin, which may cause the skin to be cold. Therefore, in the absorbent article of the present invention, the region (substantially central portion in the longitudinal direction and the width direction of the absorbent body) in which the excrement (exemplified by urine and menstrual blood) is discharged and the region (temperature-sensitive portion) in which the temperature-sensitive agent is disposed are separated from each other at least in the longitudinal direction. That is, the temperature sensitive agent is present in a portion that is difficult to contact with excrement. Therefore, even if the cooled excrement adheres to the skin and cools the skin, the temperature sensitive agent distant from the excrement can continuously provide the temperature, and thus the skin can be inhibited from being cooled.
Hereinafter, an absorbent article according to an embodiment will be described by taking a sanitary napkin as an example. The absorbent article is not limited to this example, and other absorbent articles may be used as long as they do not depart from the spirit of the present invention. Examples of other absorbent articles include panty liners, incontinence pads, and disposable diapers.
The structure of the sanitary napkin 1 according to the present embodiment will be described.
Fig. 1 to 3 are views showing a configuration example of a sanitary napkin 1 according to the present embodiment. Fig. 1 is a plan view showing a state where an individual packaging sheet 43 of a sanitary napkin 1 is opened and unfolded. Fig. 2 is a cross-sectional view of the sanitary napkin 1 shown in fig. 1 taken along a longitudinal center line CL (described later) (except for the individual package sheet 43). Fig. 3 is a bottom view of the sanitary napkin 1 shown in fig. 1 (except for the individual packaging sheet 43). The sanitary napkin 1 of the present embodiment has a longitudinal direction L, a width direction W, and a thickness direction T that are orthogonal to each other. In the sanitary napkin 1 shown in fig. 1, the upper side of the drawing is defined as the front side (front) or the ventral side in the longitudinal direction L, and the lower side of the drawing is defined as the rear side (rear) or the back side in the longitudinal direction L. The sanitary napkin 1 placed on a plane including the longitudinal direction L and the width direction W as viewed from above in the thickness direction T is referred to as "planar shape", and the shape grasped in the planar shape is referred to as "planar shape". An arbitrary direction in a plane including the longitudinal direction L and the width direction W is referred to as a "plane direction". The side that becomes the skin surface relatively close to the wearer in the thickness direction T when the sanitary napkin 1 is worn by the wearer is referred to as the "skin side", and the side that becomes the skin surface relatively distant from the wearer in the thickness direction T is referred to as the "non-skin side". These definitions are also common to the respective materials of the sanitary napkin 1.
The individual packaging sheet 43 is formed such that both end portions in the longitudinal direction L extend outward in the longitudinal direction L from both end portions in the longitudinal direction L of the sanitary napkin 1, and both end portions in the width direction W extend outward in the width direction W from both end portions in the width direction W of the sanitary napkin 1. That is, when the sanitary napkin 1 is placed on the individual packaging sheet 43, the sanitary napkin 1 can be placed so as not to protrude outside the individual packaging sheet 43 in a plan view, and thus, when the sanitary napkin 1 is folded together with the individual packaging sheet 43, the sanitary napkin 1 can be packaged so as not to protrude outside the individual packaging sheet 43.
The sanitary napkin 1 includes an absorbent main body 3 that mainly absorbs liquid excreta (exemplified by menstrual blood), and a temperature-sensitive body 5 that is located on the front side in the longitudinal direction L of the absorbent main body 3 and is for making the skin feel a temperature. That is, the sanitary napkin 1 is divided into the absorption body 3 on the rear side in the longitudinal direction L and the temperature-sensitive body 5 on the front side in the longitudinal direction L. The absorbent main body 3 has a shape substantially similar to that of a normal sanitary napkin, and includes a pair of wings 17, 17 extending outward in the width direction W. The shape of the temperature-sensitive body 5 is not particularly limited, and examples thereof include: triangle, rectangle, polygon (including the case of round corner and the case of curve side); circular and oval; the shape of the living being; or a combination thereof. The sanitary napkin 1 has a longitudinal center line CL (imaginary line) extending in the longitudinal direction L through the center in the width direction W, and a width center line CW (imaginary line) extending in the width direction W through the center in the longitudinal direction L of each of the pair of wing portions 17, 17 connected to each other in the width direction W. In the sanitary napkin 1, the direction toward the longitudinal center line CL is set to be inward in the width direction W, the side toward the longitudinal center line CL is set to be inward in the width direction W, the direction away from the longitudinal center line CL is set to be outward in the width direction W, and the side away from the longitudinal center line CL is set to be outward in the width direction W. On the other hand, the direction toward the width-direction center line CW is inward in the longitudinal direction L, the side toward the width-direction center line CW is inward in the longitudinal direction L, the direction away from the width-direction center line CW is outward in the longitudinal direction L, and the side away from the width-direction center line CW is outward in the longitudinal direction L. In the case where the pair of wing portions 17 and 17 is not present, the width-direction center line CW is a line extending in the width direction W through the center of the excretory opening contact region 21 (described later) of the absorption body 3 in the longitudinal direction L. In the present embodiment, both are identical. Alternatively, when the absorbent body 11 is of a so-called hourglass shape, the widthwise center line CW is a line extending in the widthwise direction W through a position (excluding both ends) where the dimension in the widthwise direction W of the absorbent body 11 in the longitudinal direction L is smallest. In another embodiment, the temperature-sensitive body 5 is not provided.
The sanitary napkin 1 includes, in the absorption body 3, a liquid-permeable sheet 7 that comes into contact with the skin of the wearer when worn, a liquid-impermeable sheet 9 that comes into contact with clothing (underwear) when worn, and an absorbent body 11 disposed between the liquid-permeable sheet 7 and the liquid-impermeable sheet 9. The sanitary napkin 1 further includes a liquid-permeable sheet 7 that comes into contact with the skin of the wearer when worn, a liquid-impermeable sheet 9 that comes into contact with clothing when worn, and a warming agent retaining sheet 13 disposed between the liquid-permeable sheet 7 and the liquid-impermeable sheet 9, in the warming body 5. The temperature-sensitive agent holding sheet 13 is positioned on the front side in the longitudinal direction L with respect to the absorbent body 11. The liquid-permeable sheet 7 of the absorption body 3 and the liquid-permeable sheet 7 of the temperature-sensitive body 5 are integrated sheets. The liquid-impermeable sheet 9 of the absorbent body 3 and the liquid-impermeable sheet 9 of the temperature-sensitive body 5 are a single sheet. The integrated sheet includes not only a case where the material is a single sheet but also a sheet obtained by joining and integrating a plurality of sheets. The absorber 11 of the absorption body 3 and the temperature sensitive agent holding sheet 13 of the temperature sensitive body 5 are relatively independent members. The overlapping portion 15 is formed by overlapping the front end portion of the absorbent body 11 in the longitudinal direction L and the rear end portion of the temperature sensitive agent holding sheet 13 in the longitudinal direction L in the thickness direction T. That is, the front end edge 11E1 of the absorbent body 11 is positioned further forward than the rear end edge 13E2 of the temperature sensitive agent holding sheet 13 in the longitudinal direction L. In this case, the end of the absorbent body 11 is disposed at the end of the temperature-sensitive agent holding sheet 13 in the overlapping portion 15. This is to suppress the front leakage of excrement in the longitudinal direction L. In another embodiment, when the function of giving a high level of the temperature sensation is to be taken into consideration, the end of the temperature sensitive agent holding sheet 13 is disposed at the end of the absorbent body 11 in the overlapping portion 15. In another embodiment, the end portion of the absorbent body 11 and the end portion of the temperature sensitive agent holding sheet 13 do not overlap in a plan view (the overlapping portion 15 does not exist), and these end edges are in contact with or separated from each other. In still another embodiment, the position of the front end edge 11E1 in the longitudinal direction L of the absorbent body 11 overlaps with or is located outside the position of the front end edge 13E1 in the longitudinal direction L of the temperature sensitive agent holding sheet 13. In other words, the temperature-sensitive agent holding sheet 13 overlaps the absorbent body 11 over the entire region in the longitudinal direction L. In another embodiment, the temperature-sensitive body 5 is replaced with a heat-retaining body having the same shape, and the temperature-sensitive agent holding sheet 13 is replaced with a heat-retaining sheet having the same shape and not containing a temperature-sensitive agent.
In the present embodiment, the range in the longitudinal direction L of the absorption body 3 is set to a range from the rear end edge of the sanitary napkin 1 to the front end edge 11E1 of the absorbent body 11. On the other hand, the range in the longitudinal direction L of the temperature-sensitive body 5 is from the front end edge 11E1 of the absorbent body 11 to the front end edge of the sanitary napkin 1. The absorption body 3 and the temperature-sensitive body 5 each have a range in the width direction W that extends over the entire width. In this case, it can be said that the overlapping portion 15 is included in the absorption body 3, and the rear end portion of the temperature sensitive agent holding sheet 13 of the temperature sensitive body 5 in the longitudinal direction L protrudes into the absorption body 3. The absorbent body 3 is divided in the longitudinal direction L into a front region 3a from the widthwise center line CW to the front end edge 11E1 of the absorbent body 11 and a rear region 3b from the widthwise center line CW to the rear end edge of the sanitary napkin 1. Here, the front and rear end edges of the sanitary napkin 1 in the longitudinal direction L, the front and rear end edges 11E1, 11E2 of the absorbent body 11, and the front and rear end edges 13E1, 13E2 of the temperature-sensitive agent holding sheet 13 are all located at the outermost positions in the longitudinal direction L. In the present embodiment, the end edges 11E1, 11E2 and the end edges 13E1, 13E2 are all defined as intersections with the longitudinal center line CL.
In the sanitary napkin 1, in the absorbent body 3, the excretory opening contact region 21 is located slightly forward of the center in the longitudinal direction L and at the center in the width direction W in a plan view, and the non-excretory opening contact region 23 is located around this as the other region. The excretory opening contact region 21 is a region that faces or contacts the excretory opening of the wearer when the sanitary napkin 1 is worn. The excretory opening contact region 21 is determined according to the type and use of the absorbent article. The excretory opening contact region 21 is formed, for example, in the longitudinal direction L, at a position slightly forward of the center of the absorbent body 11, with a length of about 1/4 to 2/3 of the total length of the absorbent body 11 in the longitudinal direction L, and in the width direction W, at a substantially center of the absorbent body 11, with a width of about 1/3 to 3/4 of the total length of the absorbent body 11 in the width direction W. When the pair of wing portions 17, 17 are present as in the present embodiment, the center in the longitudinal direction L of the excretory opening contact region 21 is located on a line connecting the centers in the longitudinal direction L of the pair of wing portions 17, 17 in the width direction W. Alternatively, in the case where the absorbent body 11 is of a so-called hourglass shape, the center in the longitudinal direction L of the excretory opening contact region 21 is located at a position where the dimension in the width direction W of the absorbent body is smallest, excluding both ends in the longitudinal direction L of the absorbent body. Wherein positional deviation within a range of a predetermined length is allowed. The predetermined length is set to be 5% of the length of the absorbent body 11 in the longitudinal direction L.
The liquid-permeable sheet (the 1 st sheet member) 7 overlaps the absorbent body 11 in the thickness direction T, and includes a front sheet 7a and a pair of side sheets 7b and 7b joined to both sides of the front sheet 7a in the width direction W. The dimension of the top sheet 7a in the width direction W is approximately the same as the dimension of the absorbent body 11 in the width direction W. Each side sheet 7b includes a leakage preventing wall 7W located at an inner end in the width direction W and extending in the longitudinal direction L. That is, the liquid-permeable sheet 7 includes a pair of leakage preventing walls 7W, 7W. Each of the leakage preventing walls 7W extends upward in the thickness direction T of the front sheet 7a with the outer edge as a fixed end and the inner edge as a free end in the width direction W. The pair of leakage preventing walls 7W, 7W are formed so that the free ends can stand up toward the skin when the sanitary napkin 1 is worn. The pair of leakage preventing walls 7W, 7W are formed on the absorption body 3 and the temperature sensitive body 5, and suppress leakage of excrement mainly to the outside in the width direction W, and suppress escape of air warmed by the temperature sensitive effect of the temperature sensitive body 5 to the outside in the width direction W to hold the air. In another embodiment, the front sheet 7a includes leakage preventing walls 7W extending in the longitudinal direction L at both ends in the width direction W. In another embodiment, the liquid-permeable sheet 7 does not have the pair of side sheets 7b, 7 b. In another embodiment, the liquid-permeable sheet 7 does not have a pair of leakage preventing walls 7W, 7W.
The sanitary napkin 1 includes a liquid diffusion sheet (1 st sheet member; auxiliary sheet) 41 which is in contact with the non-skin side of the topsheet 7a, overlaps the absorbent body 11 in the thickness direction T, and diffuses excrement in the planar direction. That is, the liquid diffusion sheet 41 is disposed between the top sheet 7a, the absorber 11, and the temperature-sensitive agent holding sheet 13. Fig. 4 is a plan view showing a configuration example of the liquid-permeable sheet 7 according to the present embodiment, and fig. 5 is a cross-sectional view taken along the line V-V in fig. 4. The front sheet 7a of the liquid-permeable sheet 7 and the liquid diffusion sheet 41 have a plurality of sheet compression portions 67 (sheet member concave portions) formed by compressing the front sheet 7a from the skin-side surface toward the liquid diffusion sheet 41. The plurality of sheet compressing portions 67 integrate the front sheet 7a and the liquid diffusion sheet 41. The sheet compressing portion 67 has a depression P2 formed by compression. The plurality of sheet compressed portions 67 are arranged to form a region 66 in which some of the sheet compressed portions 67 are continuously or intermittently edged (surrounded). In the present embodiment, the shape of the sheet compressing portion 67 in a plan view is circular (diameter d)67(ii) a Exemplified by 0.5mm to 2mm), but the shape is not limited to this example and is arbitrary. The shape of the one region 66 in plan view is a rhombus, and the plurality of sheet compressing portions 67 are arranged in a pattern that fills up the plurality of rhombuses, but the shape and pattern are not limited to this example and may be arbitrary. The integrated surface sheet 7a and liquid diffusion sheet 41 generally substantially abut against each other in the thickness direction T. Wherein, due to the movement of the wearer when wearing, as shown in fig. 5, for some areas 66 of the plurality of areas 66, some gaps are formed between the surface sheet 7a and the liquid diffusion sheet 41P3, the gap P3 can hold the air warmed by the temperature sensing effect. Further, the dimples P2 of the plurality of sheet compressing portions 67 can hold air warmed by the temperature sensing effect. At this time, the fiber density of the liquid-permeable sheet 7 is lower than that of the liquid diffusion sheet 41. In another embodiment, the fiber density of the liquid-permeable sheet 7 is equal to or higher than the fiber density of the liquid diffusion sheet 41. In another embodiment, the sanitary napkin 1 does not have the liquid diffusion sheet 41. Note that, in fig. 2, 10, and 11, which are cross-sectional views, the sheet compressing portion 67 is not shown.
The absorber 11 is divided in the longitudinal direction L into a central region 62 located substantially at the center, a front region 61 adjacent to the front of the central region 62, and a rear region 63 adjacent to the rear of the central region 62. Here, the central region 62 corresponds to the drain port contact region 21 and is located in a range up to a position further forward in the longitudinal direction L. The weight per unit area of the central region 62 is higher than the weight per unit area of the front region 61 and the rear region 63. Therefore, in the absorbent body 11, the weight per unit area of the region on the front side in the longitudinal direction L with respect to the widthwise center line CW is higher than the weight per unit area of the region on the rear side in the longitudinal direction L with respect to the widthwise center line CW. In other words, in the absorbent body 11, the area from the width direction center line CW to the front end edge 11E1 in the longitudinal direction L has a higher weight per unit area than the area from the width direction center line CW to the rear end edge 11E2 in the longitudinal direction L. This can increase the amount of absorption by the excretory opening contact region 21 located slightly forward of the center in the longitudinal direction L, and can reliably absorb excrement by the absorbent body 11 even when the sanitary napkin 1 is worn with the excretory opening of the wearer slightly offset forward in the longitudinal direction L relative to the excretory opening contact region 21. In another embodiment, the basis weight of the absorbent body 11 is higher in a specific portion different from the above, or is substantially constant in the entire region.
In the present embodiment, in the absorbent body 11, the thickness (or the weight per unit area) of the central portion in the width direction W is smaller (or lower) than the thickness (or the weight per unit area) of the both end portions in the width direction W. Among them, the center portion is thinner (or lower) than both end portions by 3%, preferably by 5%. Here, the end portion in the width direction W of the absorbent body 11 is a region in a range of 10% of the width of the absorbent body 11 from the end edge in the width direction W of the absorbent body 11. The central portion in the width direction W of the absorbent body 11 is a region in a range excluding both side end portions in the width direction W. When both end portions of the absorbent body 11 (with the liquid-permeable sheet 7 interposed therebetween) are in contact with the skin, some gaps can be easily formed between the central portion of the absorbent body and the skin.
The absorber 11 includes an absorbent core (not shown) and a core cladding (not shown) that wraps the absorbent core. Fig. 6 is a plan view showing a configuration example of the absorbent body 11 of the present embodiment, and fig. 7 is a cross-sectional view taken along line VII-VII in fig. 6. The absorber 11 has a plurality of absorber compressed portions 60 (absorber recesses) formed by compressing from the skin-side surface of the core wrap 11a toward the inside of the absorber 11 b. The plurality of absorbent body compressed parts 60 suppress the deformation of the absorbent body 11. Further, the absorbent body compressing portions 60 each form a depression P1 that is depressed toward the non-skin side by compression. Pocket P1 has a bottom 60B and a wall 60W. In the present embodiment, the shape of the absorbent body compressed part 60 in a plan view is circular (diameter d)60(ii) a Exemplified by 0.5mm to 2mm), but the shape is not limited to this example and is arbitrary. The absorbent body compressing sections 60 are arranged in a plurality of staggered patterns, but the pattern is not limited to this example and may be any pattern. The absorbent body compressed parts 60 each have some space between the concave part P1 and the liquid diffusion sheet 41, and can hold air warmed by the temperature-sensitive effect. In the absorbent body 11, the density of the number of absorbent body compressed portions 60 arranged in the central region 62, i.e., the region including the excretory opening contact region 21, is higher than the density of the number of absorbent body compressed portions 60 arranged in the front region 61 and the rear region 63. This is based on the viewpoint of making the central region 62 having a relatively high weight per unit area less prone to deformation and the viewpoint of keeping the air warmed by the temperature-sensitive effect more in the central region 62 including the excretory opening abutment region 21 and making it easier to warm the sensitive excretory opening. In another embodiment, the suctionThe core cladding is not used for the winding body 11. In still another embodiment, the absorbent body 11 does not have an absorbent body compressed portion. In fig. 2, 10, and 11, which are cross-sectional views, the absorbent body compressing section 60 is not shown.
In the present embodiment, the plurality of sheet compressing portions 67 are arranged in a pattern in which a plurality of rhombuses are laid out. On the other hand, the plurality of absorbent body compressed parts 60 are arranged in a plurality of staggered patterns. Therefore, it can be said that the sheet compressing sections 67 and the absorbent body compressing sections 60 are basically (mostly) arranged at positions different from each other in a plan view. Here, a part of the sheet compressed parts 67 and a part of the absorbent body compressed parts 60 of the plurality of absorbent body compressed parts 60 may be arranged at the same positions as each other in a plan view.
The temperature-sensitive agent holding sheet 13 (functional layer) is made of a single-layer or multi-layer sheet such as a nonwoven fabric capable of holding a liquid (excrement), and contains a temperature-sensitive agent 50 (functional agent). The shape of the temperature-sensitive agent holding sheet 13 is not particularly limited as long as it can be disposed inside the peripheral edge portion 27 of the sanitary napkin 1 that suppresses leakage of the temperature-sensitive agent 50, and examples thereof include a shape obtained by similarly reducing the shape of the temperature-sensitive body 5. The temperature-sensitive agent 50 contains a temperature-sensitive component that stimulates the temperature receptors of the skin (thermal perception receptors) without heating the body of the wearer of the sanitary napkin 1 or the vicinity thereof and allows the wearer to perceive a temperature, and further contains a solvent component that can dissolve or disperse the temperature-sensitive component. The temperature sensitive agent 50 contains a fluid component or a volatile component which is in the form of a gas or a liquid and which can move from the disposed portion under the influence of temperature, gas pressure, external force, or the like, and at least one of the temperature sensitive component and the solvent component contains a fluid component or a volatile component, for example. Even if the temperature-sensitive agent holding sheet 13 is disposed at a position on the non-skin side of the liquid-permeable sheet 7, the temperature-sensitive agent 50 of the temperature-sensitive agent holding sheet 13 can penetrate through the liquid-permeable sheet 7 and come into contact with the skin of the lower abdomen of the wearer by, for example, elution or volatilization when the sanitary napkin 1 is worn. Thus, the temperature sensitive component of the temperature sensitive agent 50 can stimulate the thermal sensory receptors of the skin and impart a temperature sensation to the lower abdomen of the wearer.
In the present embodiment, the temperature sensitive agent 50 is disposed in a plurality of stripe-shaped (continuous or intermittent) portions of the temperature sensitive agent holding sheet 13 extending in the longitudinal direction L and arranged in the width direction W in the range in the width direction W of the top sheet 7 a. In this case, the length of the temperature-sensitive agent holding sheet 13 in the width direction W is equal to or less than the length of the absorbent body 11 in the width direction W, and the temperature-sensitive agent 50 is less likely to leak to both outer sides of the temperature-sensitive body 5 in the width direction W. In another embodiment, the temperature sensitive agent 50 is disposed in the central portion 25 of the temperature sensitive agent holding sheet 13 on the inner side excluding the peripheral edge portion in a plan view. In this case, the length of the temperature-sensitive agent holding sheet 13 in the width direction W is longer than the length of the absorbent body 11 in the width direction W. This widens the region wider than the absorber 11 in the width direction W by the effect of the temperature sensitive agent 50. In another embodiment, the temperature sensitive agent 50 is disposed on the entire surface of the temperature sensitive agent holding sheet 13 including the peripheral edge portion in a plan view. In yet another embodiment, the temperature sensitive agent 50 does not contain a solvent component. In another embodiment, the temperature-sensitive body 5 has a support sheet for supporting the temperature-sensitive agent holding sheet 13 on the non-skin side of the temperature-sensitive agent holding sheet 13. In another embodiment, the temperature-sensitive body 5 does not include the temperature-sensitive agent 50 in the temperature-sensitive agent holding sheet 13, and therefore, the temperature-sensitive agent holding sheet 13 serves as a heat retaining sheet for retaining heat in the lower abdomen.
In the present embodiment, the absorber 11 also has a function as a functional layer, that is, contains a temperature sensitive agent 52 (functional agent). Fig. 8 is a schematic diagram showing the arrangement of the temperature sensitive agent 52 in the absorber 11 of the embodiment. The temperature sensitive agent 52 is disposed on the skin-side surface of the absorber 11 in a plurality of stripe-shaped (continuous or intermittent) portions extending in the longitudinal direction L and arranged in the width direction W. In this case, the range in the width direction W in which the temperature sensitive agent 52 is disposed is substantially within the range in the width direction W of the top sheet 7 a. The temperature sensitive agent 52 is disposed at a position different from that of the temperature sensitive agent 50, but has the same properties. In another embodiment, the temperature sensitive agent 52 is disposed in another part of the absorbent body 11, for example, on the surface on the non-skin side or inside. In yet another embodiment, the absorbent body 11 does not contain a temperature sensitive agent 52.
In the present embodiment, the liquid-permeable sheet 7 (the 1 st sheet member) also has a function as a functional layer, that is, contains a temperature sensitive agent 51 (functional agent). Fig. 9 is a schematic view showing the arrangement of the temperature sensitive agent in the liquid-permeable sheet according to the embodiment. The temperature sensitive agent 51 is disposed on the non-skin side surface of the liquid-permeable sheet 7 in a plurality of stripe-shaped (continuous or intermittent) portions extending in the longitudinal direction L and arranged in the width direction W. In this case, the range in the width direction W in which the temperature sensitive agent 51 is disposed is substantially within the range in the width direction W of the absorbent body 11. The temperature sensitive agent 51 is disposed at a position different from that of the temperature sensitive agent 50, but has the same properties. In another embodiment, the temperature sensitive agent 51 is disposed on another part of the liquid-permeable sheet 7, for example, on the skin side surface. In another embodiment, the temperature sensitive agent 51 is disposed on the surface of the liquid diffusion sheet 41 on the non-skin side or skin side, but not on the liquid-permeable sheet 7, or is disposed on the surface of the liquid diffusion sheet 41 on the non-skin side or skin side in addition to the liquid-permeable sheet 7. In another embodiment, the liquid-permeable sheet 7 does not contain the temperature-sensitive agent 51.
Therefore, in the present embodiment, at least one of the above-described mode in which the absorbent body 11 contains the temperature sensitive agent 52, the mode in which the liquid-permeable sheet 7 as the 1 st sheet member contains the temperature sensitive agent 51, and the mode in which the liquid diffusion sheet 41 as the 1 st sheet member contains the temperature sensitive agent 51 is implemented. The liquid-permeable sheet 7 and the liquid diffusion sheet 41 as the 1 st sheet member include a plurality of sheet compressed portions 67 as a plurality of sheet member concave portions that are recessed from the skin-side surface toward the non-skin-side surface in a region overlapping with the temperature sensitive agent 51 in a plan view. The absorbent body 11 includes absorbent body compressed portions 60, which are a plurality of absorbent body concave portions, recessed from the skin-side surface toward the non-skin-side surface at positions different from the plurality of sheet compressed portions 67 in the region overlapping with the temperature sensitive agent 52 in a plan view.
In another preferred embodiment of the present embodiment, the sanitary napkin 1 includes a temperature-sensitive agent in the temperature-sensitive body 5. That is, the sanitary napkin 1 is at least one of a case where the temperature-sensitive agent holding sheet 13 contains the temperature-sensitive agent 50, a case where the liquid-permeable sheet 7 of the temperature-sensitive body 5 contains the temperature-sensitive agent 51, and a case where the liquid diffusion sheet 41 of the temperature-sensitive body 5 contains the temperature-sensitive agent 51.
Here, even if the body temperature rises due to the temperature sensitive agent, if there is excrement (exemplified by urine and menstrual blood), the excrement is cooled by the outside air temperature and the heat of vaporization, and the cooled excrement adheres to the skin, which may cause the skin to be cold. Therefore, in the sanitary napkin 1, the region where excrement is excreted (substantially the center in the longitudinal direction L and the width direction W of the absorbent body 11) and the region where the temperature sensitive agent is disposed (the temperature sensitive body 5) are separated from each other at least in the longitudinal direction L. That is, the temperature sensitive agent is present in a portion that is difficult to contact with excrement. Therefore, even if the cooled excrement adheres to the skin and cools the skin, the temperature sensitive agent distant from the excrement can continuously provide the temperature, and thus the skin cooling can be suppressed.
In the sanitary napkin 1, the liquid-impermeable sheet 9 (the 2 nd sheet member) and the absorbent body 11 are superposed in the thickness direction T and have no air permeability (are non-air permeability). Therefore, the sanitary napkin 1 is configured such that air present in the region closer to the skin than the liquid-impermeable sheet 9 is less likely to escape to the non-skin side of the liquid-impermeable sheet 9, that is, to the outside of the sanitary napkin 1. In other words, the sanitary napkin 1 is configured such that it is difficult for air warmed by the temperature sensing effect to escape to the outside of the sanitary napkin 1.
The temperature-sensitive agent-retaining sheet 13 is made of a sheet (exemplified by nonwoven fabric) capable of retaining liquid, and therefore can absorb excrement, although not to the extent of the absorbent body 11. Therefore, the temperature-sensitive agent holding sheet 13 can be regarded as a low absorption portion having absorption performance lower than that of the absorbent body 11. The low absorption portion is included in the temperature-sensitive body 5 and can assist in absorbing excrement forward in the longitudinal direction L. Here, depending on the relationship between the temperature-sensitive agent-holding sheet 13 and the absorbent body 11, the absorbent body 11 and the low-absorption portion (temperature-sensitive agent-holding sheet 13) can be said to be continuous in the longitudinal direction L when viewed from the width direction W. Similarly, a part of the absorbent body 11 and a part of the low absorption portion overlap each other in the thickness direction T at the overlapping portion 15, and the part of the absorbent body overlaps the part of the low absorption portion on the skin side. In another embodiment, when the temperature-sensitive body 5 has a support sheet (exemplified by a nonwoven fabric) having the same shape as the temperature-sensitive agent holding sheet 13 in a plan view, for example, on the non-skin side of the temperature-sensitive agent holding sheet 13, the support sheet (including or not including the temperature-sensitive agent holding sheet 13) can be regarded as a low absorption portion having absorption performance lower than that of the absorbent body 11.
The sanitary napkin 1 includes an adhesive portion for fixing the sanitary napkin 1 to the clothing of the wearer in both the absorption body 3 and the temperature-sensitive body 5. One surface of the adhesive part is fixed to the liquid-impermeable sheet 9, and the other surface is temporarily fixed to the individual packaging sheet 43 of the sanitary napkin 1. The absorption body 3 is provided with: adhesive sections 73 arranged in a region overlapping the absorbent body 11 in a plan view, for example, extending in the longitudinal direction L and arranged intermittently in the width direction W; and an adhesive portion 71 extending in the longitudinal direction L at a substantially central portion in the width direction W of the wing portion 17. On the other hand, the adhesive portions 72 are disposed in the regions of both end portions in the width direction W of the temperature-sensitive body 5. In another embodiment, the other surface of the adhesive portion is temporarily fixed to the release sheet fixed to the individual packaging sheet 43.
As shown in fig. 1, the individual package (sanitary napkin 1+ individual package sheet 43) has a longitudinal 1 st fold line F1 (for example, a left fold line) and a longitudinal 2 nd fold line F2 (for example, a right fold line), and a width 1 st fold line F3 (for example, a front fold line) and a width 2 nd fold line F4 (for example, a rear fold line). The longitudinal direction 1-th folding line F1 and the longitudinal direction 2-th folding line F2 (a pair of longitudinal direction folding lines) extend in the longitudinal direction L and are arranged in parallel with each other at a predetermined interval from one side to the other side in the width direction W. The width-direction 1 st folding line F3 and the width-direction 2 nd folding line F4 extend in the width direction W and are arranged in parallel with each other at predetermined intervals from one side to the other side in the longitudinal direction L. That is, the number of the longitudinal folding lines is 2, and the number of the width folding lines is 2. The 1 st fold line F3 in the width direction is disposed in front of the sanitary napkin 1, and the 2 nd fold line F4 in the width direction is disposed behind the sanitary napkin 1. The widthwise 1 st fold line F3 is located at the front end of the absorption body 3 and the rear end of the temperature sensitive body 5. Specifically, the widthwise 1 st fold line F3 is located closer to the widthwise center line CW than the front end edge 11E1 in the longitudinal direction L of the absorbent body 11. The width direction 1-th folding line F3 and the width direction 2-th folding line F4 are located on the front side and the rear side in the longitudinal direction L of the drain contact region 21 so as to avoid the drain contact region 21. In another embodiment, there is no longitudinal fold. In still another embodiment, the number of the width-direction folding lines is 1 or 3 or more.
In addition, in the sanitary napkin 1, when the individual packaging sheet 43 is individually packaged, the portions (the pair of outer portions) on the outer sides in the width direction W from the both folding lines are folded toward the skin-side surface, with the longitudinal direction 1-fold line F1 and the longitudinal direction 2-fold line F2 as the base axes. Next, in the sanitary napkin 1 folded together with the individual packaging sheet 43, the portions on the outer side in the longitudinal direction L from both the fold lines are folded toward the skin side surface with the width direction 1-fold line F3 and the width direction 2-fold line F4 as the base axis. Thereafter, one end portion of the individual packaging sheet 43 is fixed to the individual packaging sheet 43 facing thereto by the fixing tape 45. This forms an independent package of the sanitary napkin 1. Further, when the sanitary napkin 1 is used, that is, when the individual package is opened, the opening is performed in a reverse procedure to that in the individual package.
The sanitary napkin 1 further includes a plurality of compressed portions 31 and 33. The plurality of compressed portions 31 are arranged continuously or intermittently in a curved shape so as to surround the excretory opening contact region 21 mainly in the absorption body 3. The plurality of compressed parts 33 are disposed in a dot-like manner and dispersed in a region surrounded by the plurality of compressed parts 31 of the absorption body 3. The compression portions 31 and 33 are formed by compressing the liquid-permeable sheet 7 and the absorbent body 11 (the overlapping portion 15 further includes the warming agent holding sheet 13) from the skin side toward the non-skin side. The shape and arrangement of the plurality of compressing portions 31 and 33 are arbitrary. In another embodiment, the temperature-sensitive body 5 further includes one or more compressed portions formed by compressing the liquid-permeable sheet 7 and the temperature-sensitive agent holding sheet 13 (the absorbent body 11 is further included in the superposed portion 15) from the skin side to the non-skin side. The shape of the compression portion is arbitrary.
The sanitary napkin 1 further includes a seal portion 29. The sealing portion 29 is formed by joining and sealing the liquid-permeable sheet 7 and the liquid-impermeable sheet 9 at their peripheral edge portions 27 by a known method such as heat sealing. In the sanitary napkin 1, the non-skin side surface of the liquid-permeable sheet 7 and the skin side surfaces of the absorber 11 and the temperature sensitive agent-retaining sheet 13 are bonded to each other with a 1 st adhesive (not shown), and the non-skin side surfaces of the absorber 11 and the temperature sensitive agent-retaining sheet 13 and the skin side surface of the liquid-impermeable sheet 9 are bonded to each other with a 2 nd adhesive (not shown). In the present embodiment, the weight per unit area of the 2 nd adhesive (not shown) is larger than that of the 1 st adhesive. In another embodiment, the weight per unit area of the 2 nd adhesive (not shown) is less than the weight per unit area of the 1 st adhesive, or both weights are the same.
In the sanitary napkin 1, when worn on a wearer, a temperature-sensitive effect can be obtained by at least one of the temperature-sensitive agent 52 of the absorber 11 and the temperature-sensitive agent 51 of the liquid-permeable sheet 7 (and the liquid diffusion sheet 41) (the 1 st sheet member) so that the wearer can perceive warmth. At this time, since the liquid-permeable sheet 7 (and the liquid diffusion sheet 41) includes the plurality of sheet compressing portions 67 (sheet member concave portions), at least a part of the air warmed by the effect of the temperature sensitive agent 51 can be held by the dimples P2 of the plurality of sheet compressing portions 67. Further, since the absorber 11 includes the plurality of absorber compressed parts 60 (absorber recesses), at least a part of the air warmed by the effect of the temperature sensitive agent 52 can be held by the dimples P1 of the plurality of absorber compressed parts 60. Here, since the sheet compressing portions 67 and the absorber compressing portions 60 are shifted from each other in position, a large amount of warmed air can be retained when the plurality of sheet compressing portions 67 and the plurality of absorber compressing portions 60 are combined. Further, the air held by the absorbent body 11 and the liquid-permeable sheet 7 (and the liquid diffusion sheet 41) can be substantially confined to the skin side so as not to flow out to the outside by the liquid-impermeable sheet 9 (the 2 nd sheet member) which is located on the non-skin side and is air-impermeable. By these synergistic effects, in addition to the temperature-sensitive effect obtained by the temperature-sensitive agent 51 and/or the temperature-sensitive agent 52, even when the temperature-sensitive agent is hard to reach the skin due to excrement or the temperature of the absorbent body 11 is lowered, the skin can be kept warm by the warmed air, and the temperature-sensitive effect can be obtained. This can improve the persistence of the temperature sensation.
Next, a preferred method of using the sanitary napkin 1 of the present embodiment will be described.
When the wearer wears the sanitary napkin 1, the sanitary napkin 1 is first fixed to a garment (exemplified by underpants) so that the excretory opening contact region 21 of the absorbent body 11 of the absorbent body 3 corresponds to the excretory opening of the wearer. Thereby, the sanitary napkin 1 is fixed to the clothing so that the temperature-sensitive agent holding sheet 13 of the temperature-sensitive body 5 corresponds to the lower abdomen of the wearer. Then, the sanitary napkin 1 is used in a state where the skin-side surface of the temperature-sensitive body 5 is in contact with the skin of the lower abdomen of the wearer.
In other words, the sanitary napkin 1 has the following shape: when the absorbent main body 3 is placed on the clothing so that the excretory opening contact region 21 of the absorbent body 11 contacts the excretory opening of the wearer, the temperature sensitive agent retaining sheet 13 is placed at a position corresponding to the lower abdomen of the wearer. Therefore, the distance between the excretory opening contact region 21 of the absorbent body 11 of the absorbent body 3 and the temperature sensitive agent retaining sheet 13 of the temperature sensitive body 5 is substantially equal to the distance between the excretory opening of the wearer and the lower abdomen (distance on the skin surface).
In the present embodiment, the temperature sensitive agent 50 (functional agent) of the temperature sensitive agent-holding sheet 13 contains a temperature sensitive component for activating the TRP channel and a solvent component. Therefore, when the sanitary napkin 1 is used by being fixed to clothing, the temperature sensitive agent 50 contained in the temperature sensitive agent-retaining sheet 13 penetrates through the liquid-permeable sheet 7 and comes into contact with the skin of the wearer, and the TRP channel in the temperature sensitive agent-contacting portion of the skin of the wearer which is in contact with the temperature sensitive component can be activated efficiently, thereby imparting a temperature sensation to the lower abdomen of the wearer efficiently.
By imparting a temperature sensation to the lower abdomen of the wearer, the TRP channel of the temperature sensitive component-contacting portion of the skin of the lower abdomen of the wearer is activated, and as a result, heat is generated from the temperature sensitive component-contacting portion via the sympathetic nervous system, and the temperature of the temperature sensitive component-contacting portion of the skin of the wearer can be expected to increase. As a result, it is expected that the site close to the uterus of the wearer is warmed, the pain substance prostaglandin is discharged, and the dysmenorrhea of the wearer is alleviated. By warming the portion near the uterus of the wearer, it is expected to alleviate Premenstrual Syndrome (Premenstrual Syndrome), cold symptoms, climacteric disorders, and the like of the wearer. It is expected to promote blood flow (lymph flow) to discharge metabolites, improve cold syndrome, increase fat burning, and improve immunity.
In a preferred aspect of the present embodiment, in the absorbent body 11, the density of the number of absorbent body compressed portions 60 (absorbent body recesses) in the excretory opening contact region 21 is made higher than the density of the number of absorbent body compressed portions 60 (absorbent body recesses) in the non-excretory opening contact region 23. Therefore, when the sanitary napkin 1 is worn on the wearer, more warmed air can be retained in the excretory opening contact region 21. Therefore, the skin around the excretory opening, which is sensitive and therefore susceptible to temperature changes, can be kept warm. This can further improve the persistence of the temperature sensation.
In a preferred aspect of the present embodiment, the thickness of the central portion of the absorbent body 11 is made thinner than the thickness of both end portions located on both sides of the central portion in the width direction W. Therefore, when the sanitary napkin 1 is worn on the wearer and both end portions in the width direction W of the absorbent body 11 come into contact with the skin (via the liquid-permeable sheet 7 and the liquid diffusion sheet 41 (the 1 st sheet member)), some gaps can be easily formed between the center portion of the absorbent body 11 and the skin. In addition, the warmed air can be further retained in the gap. Therefore, the skin around the excretory opening, which may come into contact with the central portion of the absorbent body 11 and is sensitive and therefore susceptible to temperature changes, can be kept warm. This can further improve the persistence of the temperature sensation.
In a preferred embodiment of the present embodiment, the sheet member recess includes a sheet compressing portion 67 that integrates the surface sheet 7a and the liquid diffusion sheet 41 that are in contact with each other. In other words, the front sheet 7a and the liquid diffusion sheet 41 are bonded to each other by the plurality of sheet compressing portions 67, but the portions other than the sheet compressing portions 67 are not bonded. Therefore, when the sanitary napkin 1 is worn on the wearer, the top sheet 7a and the liquid diffusion sheet 41 can be easily separated from each other in the thickness direction T between the adjacent (not closest) sheet compressed parts 67, and some gaps P3 are formed. In addition, the warmed air can be further held in the gap P3. Therefore, not only the plurality of sheet compressing portions 67 but also the gap P3 can keep the skin warm with the warmed air. This can further improve the persistence of the temperature sensation.
In a preferred embodiment of the present embodiment, the fiber density of the surface sheet 7a formed of a nonwoven fabric is lower than the fiber density of the liquid diffusion sheet 41 which is in contact with the non-skin side and formed of a nonwoven fabric. Therefore, the liquid diffusion sheet 41 having a high fiber density can stably suppress the return of the excrement in the absorbent body 11 to the top sheet 7a, and further retain the air warmed by the temperature sensing effect in the gaps between the fibers of the top sheet 7a having a low fiber density. This can further improve the persistence of the temperature sensation.
In a preferred embodiment of the present embodiment, the front sheet 7a has a pair of leakage preventing walls 7W, 7W on both sides in the width direction W. Therefore, when the sanitary napkin 1 is worn on the wearer, the pair of leakage preventing walls 7W, 7W are in a state of being slightly raised toward the skin side, and some space can be easily generated on the skin side of the top sheet 7a by the pair of leakage preventing walls 7W, 7W and the top sheet 7 a. In addition, the warmed air can be further retained in the space. This allows the skin to be kept warm by the warmed air in the space, in addition to the plurality of sheet compressing portions 67 and the plurality of absorbent body compressing portions 60. This can further improve the persistence of the temperature sensation.
In a preferred embodiment of the present embodiment, a temperature sensitive agent holding sheet 13 (front temperature sensitive portion) containing a temperature sensitive agent 50 is further provided on the front side (the abdominal side of the wearer) in the longitudinal direction L of the temperature sensitive body 5, that is, the absorbent body 11. Therefore, when the sanitary napkin 1 is worn on the wearer, the abdomen side portion of the wearer can be warmed by the temperature sensitive agent 50. Further, since the pair of leakage preventing walls 7W, 7W extend to the temperature sensitive agent holding sheet 13, some space can be easily created even in the portion on the abdominal side of the wearer by the pair of leakage preventing walls 7W, 7W and the top sheet 7 a. In addition, the warmed air can be held in this space. Thus, in addition to the plurality of sheet compressing portions 67 and the plurality of absorbent body compressing portions 60, the skin can be kept warm by the warmed air also in the abdomen-side portion of the wearer in the space. This can further improve the persistence of the temperature sensation.
In another embodiment, the leakage preventing wall 7W has a structure in which two or more sheets are stacked. Fig. 10 is a cross-sectional view of a sanitary napkin 1 according to another embodiment taken along a width-direction center line CW. In this case, the leakage preventing walls 7W are formed on both ends of the front sheet 7a in the width direction W, respectively. Specifically, the pair of leakage preventing walls 7W, 7W are formed in a ring shape when viewed in the longitudinal direction L by folding back both ends in the width direction W of the surface sheet 7a to the inside in the width direction W of the surface sheet 7a and to the non-skin side (below in the thickness direction T). The upper portion of the leakage preventing wall 7W in the thickness direction T, i.e., the upper portion of the ring, is defined as an upper layer 7W1 of the leakage preventing wall 7W, and the lower portion, i.e., the lower portion of the ring, is defined as a lower layer 7W2 of the leakage preventing wall 7W. In this case, the leakage preventing wall 7W can be said to have a structure in which two sheets of the upper layer 7W1 and the lower layer 7W2 are stacked. When the sanitary napkin 1 is worn on the clothing of the wearer, the hollow bulging portions of the pair of leakage preventing walls 7W, that is, the ring-shaped portions formed by the upper layer 7W1 and the lower layer 7W2, project outward from the absorbent body 11. As a result, when the sanitary napkin 1 is sandwiched between the legs of the wearer in the width direction W and the absorbent body 11 is deformed along the shape of the crotch of the wearer, these ring-shaped portions can easily deform following the deformation of the absorbent body 11. Therefore, these annular portions (the pair of leakage preventing walls 7W, 7W) can give the wearer a cushion performance and maintain the close contact with the crotch of the wearer. This can provide a good wearing feeling by the leakage preventing wall 7W, and can suppress the side leakage of excrement. Further, with such a configuration, when the sanitary napkin 1 is worn on a wearer, the air held in the space created by the pair of leakage preventing walls 7W, 7W and the top sheet 7a and the space P4 created in the annular portion can be made more difficult to escape outward. Therefore, the warmed air can be further retained in these spaces as well as in the plurality of sheet compressing portions 67 and the plurality of absorbent body compressing portions 60. This allows the skin to be further kept warm by the warmed air. This can further improve the persistence of the temperature sensation.
In another embodiment, the leakage preventing wall 7W has a structure in which two or more sheets are stacked. Fig. 11 is a cross-sectional view of a sanitary napkin according to yet another embodiment taken along the widthwise centerline. In this case, the leakage preventing walls 7W are formed on the inner end portions of the pair of side sheets in the width direction W, respectively. Specifically, the pair of leakage preventing walls 7W, 7W each include: a lower layer 7W2 having an outer end edge as a fixed end in the width direction W; and an upper layer 7W1 connecting the inner end edge and the inner end edge of the lower layer 7W2 in the width direction W, and having the outer end edge as a free end. The inner edge of the lower layer 7W2 is not substantially fixed, and therefore can be said to be a free end. That is, the height of the leakage preventing wall 7W in the thickness direction T can be made higher, and the space formed by the pair of leakage preventing walls 7W, 7W and the front sheet 7a can be made larger. With this configuration, when the sanitary napkin 1 is worn on a wearer, the air held in the space created by the pair of leakage preventing walls 7W, 7W and the top sheet 7a and the air accumulated between the upper layer 7W1 and the lower layer 7W2 can be made more difficult to be released outward, and the air can be held more. Therefore, the warmed air can be further retained in these spaces as well as in the plurality of sheet compressing portions 67 and the plurality of absorber compressing portions 60. This allows the skin to be further kept warm by the warmed air. This can further improve the persistence of the temperature sensation.
In a preferred embodiment of the present embodiment, the weight per unit area of the 2 nd adhesive (not shown) that bonds the liquid-impermeable sheet 9 and the absorbent body 11 is greater than the weight per unit area of the 1 st adhesive (not shown) that bonds the liquid-permeable sheet 7 (including the liquid diffusion sheet 41) and the absorbent body 11. Here, the liquid-impermeable sheet 9 may have some air permeability although it is air-impermeable. Therefore, by making the weight per unit area of the 2 nd adhesive relatively large, the gap related to air permeability on the skin-side surface of the liquid-impermeable sheet 9 can be covered, and therefore, the air impermeability of the liquid-impermeable sheet 9 to which the 2 nd adhesive is added can be further improved. Therefore, the air warmed by the temperature sensing effect can be more stably held at the skin side than the liquid-impermeable sheet 9. This can further improve the persistence of the temperature sensation.
In a preferred aspect of the present embodiment, the sanitary napkin 1 is configured such that, when folded and individually packaged, portions thereof on the outer side in the width direction W than the pair of the longitudinal direction 1 st folding line F1 and the longitudinal direction 2 nd folding line F2 are folded toward the skin-side surface with both folding lines as basal axes. Therefore, in the sanitary napkin 1, the fold lines are formed at the positions of the pair of longitudinal direction 1-fold line F1 and the longitudinal direction 2-fold line F2, and the portions outside the fold lines (the pair of outer portions) are likely to rise toward the skin. Therefore, when the sanitary napkin 1 is worn, the pair of outer portions tends to rise in the width direction W and press the skin surface, and the central portion inside the pair of outer portions is likely to slightly separate from the skin surface. That is, a gap is easily generated between the skin surface and the central portion. Therefore, the air warmed by the temperature sensing effect can be further retained in the gap. This can further improve the persistence of the temperature sensation.
In the sanitary napkin 1 of the present embodiment, as a preferable mode, the distance between the widthwise center line CW and the front end edge 11E1 of the absorbent body 11 is longer than the distance between the front end edge 11E1 of the absorbent body 11 and the front end edge of the sanitary napkin 1 in the longitudinal direction L. In other words, in the region of the sanitary napkin 1 on the front side in the longitudinal direction L with respect to the widthwise center line CW, the length in the longitudinal direction L of the region where the absorbent body 11 is present is longer than the length in the longitudinal direction L of the region where the absorbent body 11 is not present. Therefore, in the front region in the longitudinal direction L of the sanitary napkin 1, a region of the absorbent body 11 capable of absorbing the liquid excrement can be sufficiently secured in the longitudinal direction L. Therefore, when the sanitary napkin 1 having the temperature-sensitive body 5 on the front side in the longitudinal direction L and a relatively long front portion is worn on underwear, even if the wearer shifts the sanitary napkin 1 to the rear side by a necessary amount or more in anticipation of the protrusion of the front end portion, the region of the absorbent body 11 can be sufficiently secured in the front region of the sanitary napkin 1, and thus leakage of excrement from the front side can be suppressed. The lower limit of the length of the front region 3a of the absorption body 3 is preferably 110 to 130% of the length of the temperature-sensitive body 5 from the viewpoint of suppressing leakage of excrement from the front side, and the upper limit is preferably 300 to 200% or less of the length of the temperature-sensitive body 5 from the viewpoint of sufficiently obtaining the temperature-sensitive effect of the temperature-sensitive body 5.
(materials of sanitary napkin 1, etc.)
Next, materials and the like of the sanitary napkin 1 in each embodiment will be described.
The temperature sensitive agent-retaining sheet 13, the liquid-permeable sheet 7, and the absorbent body 11 as the functional layers of the above embodiments have the temperature sensitive agent 50, the temperature sensitive agent 51, and the temperature sensitive agent 52 containing the temperature sensitive component for activating the TRP channel (thermoreceptor (thermo-sensory receptor)) and the solvent component.
The temperature sensitive agents 50, 51, 52 contain, for example, a temperature sensitive component for activating a TRP channel and a solvent component. The thermosensitive component is not particularly limited as long as it activates the TRP channel, and examples thereof include an agonist against TRPV1 receptor, an agonist against TRPV3 receptor, and the like, and preferably an agonist against TRPV 1. This is because, the activation temperature threshold of TRPV1 receptor is as high as exceeding 43 ℃, which can impart higher temperature sensation to the wearer.
The temperature-sensitive component is preferably a plant-derived compound from the viewpoint of the feeling of comfort of the wearer. Examples of the temperature-sensitive component include capsaicin, capsaicinoids (dihydrocapsaicin, nordihydrocapsaicin, homodihydrocapsaicin, homocapsaicin, nonivamide, etc.), capsorubin, benzyl nicotinate, β -butoxyethyl nicotinate, N-acetyl vanillylamide, vanillylnonanoate, polyol, paprika, capsicum tincture, capsicum extract, vanillyl nonanoate ether, vanillyl alcohol alkyl ether derivatives (exemplified by vanillyl ethyl ether, vanillyl alcohol butyl ether, vanillyl alcohol pentyl ether, vanillyl alcohol hexyl ether), isovanillyl alcohol alkyl ether, ethyl vanillyl alcohol alkyl ether, veratryl alcohol derivatives, substituted benzyl alcohol alkyl ethers, vanillin propylene glycol acetal, ethyl vanillin propylene glycol acetal, ginger extract, ginger oil, gingerol, zingerone, hesperidin, pyrrolidone carboxylic acid, and any combination thereof. Among them, from the viewpoint of making the wearer feel less painful, the temperature-sensitive component is preferably not capsaicin, and more preferably vanillyl alcohol alkyl ether derivatives (exemplified by vanillyl alcohol ethyl ether, vanillyl alcohol butyl ether, vanillyl alcohol pentyl ether, and vanillyl alcohol hexyl ether), ginger extract, ginger oil, gingerol, zingerone, and any combination thereof.
The solvent component is not particularly limited as long as it can contain a temperature sensitive component, and examples thereof include lipophilic solvents and hydrophilic solvents. Such a solvent component can dissolve, disperse, or the like the temperature sensitive component. Examples of the lipophilic solvent include fats and oils. Examples of the oils and fats include natural oils (e.g., fatty acid esters such as triglycerides, coconut oil, linseed oil, and the like), hydrocarbons (e.g., paraffins (e.g., liquid paraffin)), and the like. Examples of the hydrophilic solvent include water and alcohol. Examples of the alcohol include lower alcohols such as methanol, ethanol, ethylene glycol and glycerol, and higher alcohols such as octanol, lauryl alcohol and myristyl alcohol. Among them, from the viewpoint of easy control of volatility, particularly easy reduction of volatility, the solvent component is preferably an oil or fat (lipophilic solvent) or an alcohol (hydrophilic solvent). In addition, the solvent component is preferably a lipophilic solvent from the viewpoint of difficulty in inhibiting the absorbability.
The temperature sensitive agent 51 of the liquid-permeable sheet 7 and the temperature sensitive agent 52 on the surface of the absorbent body 11 preferably coexist with a durable hydrophilic oil agent (durable hydrophilizing agent) having a property of being less likely to flow out to the lower layer (exemplified: the absorbent body 11 and the lower part of the absorbent body 11) by the liquid excrement. That is, the solvent component preferably contains a durable hydrophilic oil agent. The durable hydrophilic finish is not particularly limited, and a durable hydrophilic finish coated or kneaded into a fiber can be used in the present technical field. Examples of the durable hydrophilizing agent include alkyl phosphate ester salts having 10 to 30 carbon atoms and betaine compounds having 10 to 30 carbon atoms, mixtures of sulfate ester salts or sulfonate salts, and mixtures of alkyl phosphate ester salts and polyether-modified silicones. Therefore, the temperature sensitive agents 51 and 52 can be inhibited from being transferred to the lower layer by the excrement. That is, the temperature sensitive agent can be maintained relatively close to the skin. This can further improve the persistence of the temperature sensation. In another embodiment, at least one of the constituent fibers of the liquid-permeable sheet 7 in which the temperature sensitive agent 51 is disposed and the constituent fibers of the absorbent body 11 in which the temperature sensitive agent 52 is disposed is treated with a durable hydrophilic finish in advance, and the properties of the durable hydrophilic finish are imparted to the constituent fibers themselves.
The concentration of the temperature sensitive component in the temperature sensitive agent 50 is preferably 1 to 50% by mass, more preferably 3 to 30% by mass, and still more preferably 5 to 15% by mass. This is from the viewpoint of the effect of temperature sensing. In the sanitary napkin 1, the weight per unit area of the temperature-sensitive component of the temperature-sensitive agent 50 is preferably 0.001g/m2～30g/m2More preferably 0.01g/m2～20g/m2More preferably 0.1g/m2～10g/m2. This is from the viewpoint of imparting a feeling of warmth to the wearer.
In the sanitary napkin 1, the temperature-sensitive agent may contain at least one other component having a desired action within a range not to inhibit the effect of imparting a temperature to the wearer, in addition to the temperature-sensitive component and the solvent component. Examples of the at least one other component include an antibacterial agent, a skin astringent, an anti-inflammatory agent, vitamins, amino acids, zeolite, hyaluronic acid, collagen, vaseline, trehalose, a pH adjuster, a humectant, and a perfume.
The temperature sensitive agent of the sanitary napkin 1 is different from a heat generating agent that generates heat by the agent itself, and is less likely to cause low-temperature burns, and the adhesive portion 72 and the like are less likely to soften, so that when the sanitary napkin 1 is removed from underwear and the like after use, the adhesive portion 72 and the like are less likely to remain in the underwear and the like, which is preferable.
The temperature sensitive agents 50, 51, and 52 may include heat generating agents. In this case, examples of the temperature sensitive agent 50, the temperature sensitive agent 51, and the temperature sensitive agent 52 include granular, paste-like, or sheet-like heat generating agents containing a heat generating component and a solvent component.
The temperature sensitive agents 50, 51, and 52 may be protected by a water-disintegrable protective material, such as microcapsules, in order to prevent volatilization or migration to other areas before the sanitary napkin 1 is used. The functional agent is encapsulated in the microcapsule and disintegrates when it comes into contact with a liquid (exemplified by menstrual blood, urine, and sweat), and the functional agent is released to the outside. The released functional agent is vaporized by the body temperature of the wearer or the like, or comes into contact with the skin of the wearer, thereby exerting a predetermined function on the wearer.
Examples of the raw material of the microcapsule include: saccharides such as monosaccharides (exemplified by glucose), disaccharides (exemplified by sucrose), and polysaccharides (exemplified by dextrin, glucomannan, sodium alginate, and water-soluble starch); gelatin; and water-soluble polymers (for example, polyvinyl alcohol and polyvinyl acetate).
The microcapsules are publicly available, and examples thereof include INCAP (trademark) publicly available from Symrise corporation. In addition, the microcapsules can be produced, for example, as follows: the raw material of the microcapsule is dissolved in water to form an aqueous solution, and the functional agent and the surfactant are mixed in the aqueous solution, and the mixture is dried under reduced pressure while spraying the aqueous solution.
In the sanitary napkin 1, the material of the liquid-permeable sheet 7 is not particularly limited as long as it has liquid permeability, and examples thereof include a fabric (exemplified by a nonwoven fabric, a woven fabric, and a knitted fabric), an apertured film, and the like. The fabric is preferably a nonwoven fabric from the viewpoint of ease of production of the sanitary napkin 1. Examples of the nonwoven fabric include pulp air-laid nonwoven fabric, through-air nonwoven fabric, spun-bonded nonwoven fabric, point-bonded nonwoven fabric, spunlace nonwoven fabric, needle-punched nonwoven fabric, melt-blown nonwoven fabric, and a combination thereof (for example, SMS). Among them, as the nonwoven fabric, a through-air nonwoven fabric is preferable. The liquid-permeable sheet 7 preferably has a thickness of 5g/m2～100g/m2More preferably 10g/m2～50g/m2Weight per unit area of (c). The liquid-permeable sheet 7 preferably has a thickness of 0.001g/cm3～0.6g/cm3More preferably 0.003g/cm3～0.1g/cm3The fiber density of (a).
Examples of the fibers constituting the fabric include natural fibers, synthetic fibers, and semi-synthetic fibers. Examples of the natural fibers include pulp fibers and regenerated cellulose fibers. Examples of the regenerated cellulose fibers include rayon fibers. Examples of the semi-synthetic fibers include semi-synthetic cellulose fibers such as acetate fibers. Examples of the synthetic fibers include thermoplastic fibers. Examples of the thermoplastic fibers include fibers formed of polyolefin polymers such as polyethylene and polypropylene, polyester polymers such as polyethylene terephthalate (PET), polybutylene terephthalate, and polybutylene terephthalate, polyamide polymers such as nylon 6 and nylon 6, acrylic polymers, polyacrylonitrile polymers, modified products thereof, or combinations thereof. Examples of the apertured film include apertured films having a plurality of apertured parts formed in a sheet of polyethylene or polypropylene.
The liquid-permeable sheet 7 (the 1 st sheet member) is preferably a through-air nonwoven fabric. The air-through nonwoven fabric has a web surface facing the web for conveyance during production and a non-web surface on the opposite side of the web surface. In this case, the nonwoven fabric for hot air is disposed with the web surface facing the skin side and the non-web surface facing the non-skin side. In the air-through nonwoven fabric, the gaps between the constituent fibers of the non-web surface are large. Therefore, in the sanitary napkin 1, by disposing the temperature sensitive agent 51 (temperature sensitive portion) on the non-net surface disposed on the non-skin side, the temperature sensitive agent 51 can be easily held in the space between the constituent fibers, and thus the temperature sensitive agent 51 can be released continuously, and the persistence of the temperature can be further improved. After the temperature sensitive agent 51 is consumed or flows out due to the excrement, the warmed air can be further retained in the gap. This can further improve the persistence of the temperature sensation. Further, the gaps between the constituent fibers of the web surface are small, and the web surface can smoothly abut against the skin, and the wearing feeling perceived by the wearer can be improved.
The top sheet 7a is preferably made of hydrophilic fibers (for example, cotton, rayon, wool, and silk). This makes it possible to easily introduce and retain moisture containing sweat into the constituent fibers. This makes it possible to prevent moisture from remaining on the surface of the constituent fibers, to prevent moisture from coming into contact with the skin, and to prevent the skin from feeling cold. This can further improve the persistence of the temperature sensation.
In the sanitary napkin 1, the material of the liquid diffusion sheet 41 is not particularly limited as long as it is a sheet having liquid permeability and liquid diffusion properties, and examples thereof include liquid permeable hydrophilic nonwoven fabrics and laminated nonwoven fabrics thereof, and specifically, the material listed as the material of the liquid permeable sheet 7. In addition, the liquid diffusion sheet 41 preferably has a thickness of 10g/m2～200g/m2More preferably 20g/m2～100g/m2Weight per unit area of (c). The liquid diffusion sheet 41 preferably has a thickness of 0.002g/cm3～0.8g/cm3More preferably 0.004g/cm3～0.2g/cm3The fiber density of (a). In this case, the fiber density of the liquid diffusion sheet 41 is preferably higher than that of the liquid-permeable sheet 7. In other words, the fiber density of the liquid-permeable sheet 7 is preferably lower than that of the liquid diffusion sheet 41.
In the sanitary napkin 1, the material of the liquid-impermeable sheet 9 is not particularly limited as long as it is liquid-impermeable and air-impermeable. This is from the viewpoint of making it difficult for air warmed by the temperature-sensitive effect of the temperature-sensitive agent 50 to escape from the region between the liquid-impermeable sheet 9 and the skin. Examples of the material of the liquid-impermeable sheet 9 include: synthetic resin films such as polyethylene and polypropylene; a raw material obtained by bonding a synthetic resin film to a nonwoven fabric such as spun bond or spunlace; a multilayered nonwoven fabric such as SMS is preferably a synthetic resin film having non-air permeability. The liquid-impermeable sheet 9 preferably has a thickness of 10g/m2～50g/m2More preferably 15g/m2～30g/m2Weight per unit area of (c).
In the sanitary napkin 1, examples of the material of the temperature-sensitive agent holding sheet 13 include materials listed as the material of the liquid-permeable sheet 7 and materials capable of being impregnated with the temperature-sensitive agent 50, such as a porous resin sheet like a sponge sheet. Specifically, when the solvent component of the temperature sensing agent 50 is a lipophilic solvent, examples of the solvent component include synthetic fiber fabrics, such as nonwoven fabrics, woven fabrics, and knitted fabrics, and preferred examples thereof include synthetic fiber nonwoven fabrics. When the solvent component of the temperature sensing agent is a hydrophilic solvent, examples thereof include a fabric made of a cellulose fiber, such as a nonwoven fabric, a woven fabric, and a knitted fabric, and preferably include a tissue paper made of a pulp fiber, and a pulp air-laid nonwoven fabric. In another embodiment, when a heat insulating body having a heat insulating function is used instead of the temperature sensitive body 5, examples of the material of the heat insulating sheet instead of the temperature sensitive agent holding sheet 13 include materials listed as the material of the temperature sensitive agent holding sheet 13, and in this case, the temperature sensitive agent 50 is not impregnated.
Examples of the raw material of (the absorbent core of) the absorbent body 11 in the sanitary napkin 1 include pulp fibers and super absorbent polymers. When the absorber 11 has a core-covering layer, the core-covering layer is made of, for example, tissue paper. The weight per unit area of the absorbent body 11 is, for example, 10g/m2～500g/m2Preferably 100g/m2～400g/m2。
The absorbent body 11 contains a super absorbent polymer, and the proportion of the super absorbent polymer to the absorbent body 11 is preferably 5 to 50% by mass. By setting the ratio of the super absorbent polymer to the absorbent body 11 in the predetermined range in this manner, when the super absorbent polymer absorbs excrement and swells, a gap can be formed between the adjacent swollen super absorbent polymers. Therefore, the air warmed by the temperature sensing effect can be further retained in the gap. This can further improve the persistence of the temperature sensation. When the proportion is less than 5% by mass, voids generated at the time of swelling are small, and when the proportion is more than 50% by mass, a gel blocking phenomenon occurs due to the super absorbent polymer, resulting in a decrease in the absorption performance of the sanitary napkin 1.
In the sanitary napkin 1, examples of the material of the adhesive sections 71, 72, 73 include hot-melt adhesives such as: pressure-sensitive adhesives or heat-sensitive adhesives based on rubber systems such as styrene-ethylene-butadiene-styrene (SEBS), styrene-butadiene-styrene (SBS) or styrene-isoprene-styrene (SIS) or based on olefin systems such as linear low-density polyethylene; and water-sensitive adhesives comprising a water-soluble polymer (e.g., polyvinyl alcohol, carboxymethyl cellulose, gelatin, etc.) or a water-swellable polymer (e.g., polyvinyl acetate, sodium polyacrylate, etc.).
In the sanitary napkin 1, examples of the 1 st adhesive and the 2 nd adhesive include hot-melt adhesives. Examples of the hot melt adhesive include olefin hot melt adhesives, ethylene-vinyl acetate copolymer hot melt adhesives, polyamide hot melt adhesives, thermoplastic elastomer hot melt adhesives, and reactive hot melt adhesives. Examples of the pattern of application of the 1 st adhesive and the 2 nd adhesive include a continuous or intermittent Ω pattern, a spiral pattern, and a line pattern. The weight per unit area of the 1 st adhesive and the 2 nd adhesive is preferably, for example, 2g/m2～50g/m2More preferably 5g/m2～30g/m2. Preferably, the weight per unit area of the 2 nd adhesive is larger than the weight per unit area of the 1 st adhesive.
In the sanitary napkin 1, examples of the material of the individual packaging sheet 43 include polyolefin polymers such as polyethylene and polypropylene. The individual packaging sheet 43 may include an inner liner layer from the viewpoint of improving airtightness. Examples of the material of the inner liner include: ethylene-vinyl alcohol copolymers; vinylidene chloride-based polymers such as vinylidene chloride methyl acrylate copolymers; polyvinyl alcohol; nylons, such as nylon 6; aluminum foil; a base material obtained by vapor-plating alumina, silica, or the like on a base film (polyethylene terephthalate or the like).
The absorbent article (exemplified by sanitary napkin) of the present invention is not limited to the above-described embodiments, and the embodiments may be combined with each other and known techniques may be applied thereto without departing from the object and spirit of the present invention.
DrawingsDescription of the marks
1: a sanitary napkin; 7: a liquid-permeable sheet (1 st sheet member); 9: a liquid-impermeable sheet (2 nd sheet member); 11: an absorbent body; 51. 52: a temperature sensing agent; 60: an absorber compressed portion (absorber concave portion); 67: a sheet compression portion (sheet member recess).

Claims (15)

1. An absorbent article having a longitudinal direction, a width direction, and a thickness direction, the absorbent article comprising: an absorbent body; a 1 st sheet member that is superposed on the absorber in the thickness direction, is positioned closer to the skin than the absorber, and has liquid permeability; and a 2 nd sheet member which is superposed on the absorber in the thickness direction, is positioned on the non-skin side of the absorber, and has liquid impermeability,
at least one of the absorber and the 1 st sheet member is provided with a temperature-sensitive portion containing a temperature-sensitive agent,
the region of the 1 st sheet member overlapping the temperature sensitive portion in a plan view includes a plurality of sheet member concave portions that are concave from the skin-side surface toward the non-skin-side surface,
a plurality of absorber concave portions that are concave from a skin-side surface toward a non-skin-side surface in positions different from the plurality of sheet member concave portions in a region where the absorber overlaps the temperature sensitive portion in a plan view,
the 2 nd sheet member is non-breathable.
2. The absorbent article of claim 1,
the absorbent body has an excretory opening contact region which is a region that contacts the excretory opening of the wearer and a non-excretory opening contact region which is a region other than the excretory opening contact region,
the density of the arrangement number of the absorber recesses in the excretory opening abutment region is higher than the density of the arrangement number of the absorber recesses in the non-excretory opening abutment region.
3. The absorbent article according to claim 1 or 2, wherein,
the thickness of the central portion of the absorbent body in the width direction is thinner than the thickness of both end portions of the absorbent body in the width direction.
4. The absorbent article according to claim 1 or 2, wherein,
the 1 st sheet member includes:
a surface sheet; and
an auxiliary sheet that abuts against a non-skin side of the top sheet,
the plurality of sheet member recesses each include a compressed portion formed by compressing the surface sheet and the auxiliary sheet from the skin-side surface of the surface sheet toward the non-skin-side surface of the auxiliary sheet so as to integrate the surface sheet and the auxiliary sheet.
5. The absorbent article according to claim 1 or 2, wherein,
the 1 st sheet member includes:
a surface sheet formed of a nonwoven fabric; and
an auxiliary sheet which is in contact with the non-skin side of the surface sheet and is formed of a nonwoven fabric,
the surface sheet has a lower fiber density than the auxiliary sheet.
6. The absorbent article according to claim 1 or 2, wherein,
the 1 st sheet member includes:
a surface sheet; and
a pair of side sheets bonded to both sides of the surface sheet in the width direction,
a leakage preventing wall extending in the longitudinal direction is provided at each of the inner end portions in the width direction of the pair of side sheets or each of the both end portions in the width direction of the front surface sheet,
the leakage preventing wall has a fixed end at the outer end and a free end at the inner end in the width direction,
the temperature sensing portion is located in a region overlapping with the surface sheet in a plan view.
7. The absorbent article of claim 6,
the absorbent article further includes a front temperature-sensitive portion that is located on the front side in the longitudinal direction of the absorber and contains a temperature-sensitive agent,
one surface of the front temperature sensing part is in contact with the front sheet and the pair of side sheets, and the other surface is in contact with the 2 nd sheet member.
8. The absorbent article of claim 6,
the leakage preventing wall has a structure in which two or more sheets are stacked.
9. The absorbent article according to claim 1 or 2, wherein,
the temperature-sensitive part contains the temperature-sensitive agent and a durable hydrophilic oil agent.
10. The absorbent article according to claim 1 or 2, wherein,
the 1 st piece of component is a hot air non-woven fabric,
the hot air non-woven fabric is arranged such that a net surface facing a net for conveyance is oriented toward the skin side during production, and a non-net surface opposite to the net surface is oriented toward the non-skin side,
the temperature sensing section is disposed on the non-mesh surface.
11. The absorbent article according to claim 1 or 2, wherein,
the 1 st sheet member is a surface sheet,
the surface sheet is formed of hydrophilic fibers.
12. The absorbent article according to claim 1 or 2, wherein,
the absorbent body comprises a superabsorbent polymer,
the proportion of the superabsorbent polymer to the absorbent is 5 to 50 mass%.
13. The absorbent article according to claim 1 or 2, wherein,
the weight per unit area of the 2 nd adhesive bonding the 2 nd sheet member and the absorbent body is larger than the weight per unit area of the 1 st adhesive bonding the 1 st sheet member and the absorbent body.
14. The absorbent article according to claim 1 or 2, wherein,
the absorbent article further includes a pair of longitudinal folding lines which are disposed on both sides with respect to a longitudinal center line of the absorbent article, extend along the longitudinal direction, and are arranged at intervals in the width direction,
the absorbent article is configured such that, when the absorbent article is folded and individually packaged, a portion of the absorbent article located outside the pair of longitudinal folding lines in the width direction is folded toward a skin-side surface of the absorbent article with the pair of longitudinal folding lines as a base axis.
15. The absorbent article according to claim 1 or 2, wherein,
the absorbent article includes: an absorbent body including the absorbent body; and a temperature-sensitive body containing a temperature-sensitive agent and located on the front side of the absorption body in the longitudinal direction.
CN202080001344.8A 2019-03-06 2020-03-05 Absorbent article Active CN111787894B (en)

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JP2019-041039 2019-03-06
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JPWO2020179889A1 (en) 2020-09-10
CN111787894A (en) 2020-10-16
JP7246401B2 (en) 2023-03-27
KR102625631B1 (en) 2024-01-16
WO2020179889A1 (en) 2020-09-10

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