JP7233811B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles such as sanitary napkins, incontinence pads and diapers.

Absorbent articles such as sanitary napkins sometimes feel stuffy or sticky when used for a long time, making the wearer feel uncomfortable. On the other hand, conventionally, there is a technique for improving the wearing feeling by incorporating a cooling sensation agent such as a refreshing agent into the absorbent article. Patent Literature 1 describes an absorbent article in which cooling sensation agents are arranged on both sides in the width direction of an absorbent body. Further, Patent Document 2 describes an absorbent article in which a cooling sensation agent is arranged in the hip flap portion.

JP 2010-234027 A JP 2016-13153 A

Some of the absorbent articles described in Patent Literatures 1 and 2 have a thickness difference between the central portion and both side portions in the width direction, and twists or the like may occur during wearing. In this case, the portion where the cooling sensation agent is placed may be farther than necessary from the wearer's skin surface, and the expected cooling sensation may not be sufficiently given to the wearer.

TECHNICAL FIELD The present invention relates to an absorbent article that can stably impart a cooling sensation to the wearer even when the absorbent article is separated from the wearer when worn.

The present invention comprises a surface layer, a back layer, and an absorbent layer disposed between the surface layer and the back layer, and has a longitudinal direction corresponding to the direction in which the abdomen, crotch, and back of the wearer are connected. and a width direction orthogonal to the longitudinal direction, wherein a pair of three-dimensional guard portions are provided on both sides along the longitudinal direction of the absorbent article, and the three-dimensional guard portions are , a side sheet and an elastic member that stretches in the longitudinal direction, and has a base end portion fixed to the surface layer and a standing portion facing the wearer, and at least a part of the standing portion is provided with a cooling pad. An absorbent article containing a sensitizer is provided.

INDUSTRIAL APPLICABILITY The absorbent article according to the present invention can stably impart a cooling sensation to the wearer even when the absorbent article is separated from the wearer when worn.

1 is a plan view schematically showing a stretched sanitary napkin, which is a preferred embodiment of an absorbent article of the present invention, from the side of the skin contacting surface. FIG. FIG. 2 is a cross-sectional view schematically showing the cross section of the sanitary napkin shown in FIG. 1 taken along the line II, assuming that the sanitary napkin is in its natural state. FIG. 2 is a schematic cross-sectional view of the sanitary napkin shown in FIG. 1 taken along the line II-II. (A) is a partially enlarged cross-sectional view schematically showing a cross section along the vertical direction of the standing portion of the three-dimensional guard portion when the sanitary napkin shown in FIG. 1 is in a natural state; 2 is a partially enlarged plan view schematically showing a three-dimensional guard portion when the sanitary napkin shown in FIG. 1 is in an extended state; FIG. FIG. 4 is a plan view schematically showing a stretched sanitary napkin, which is another preferred embodiment of the absorbent article of the present invention, from the side of the skin contacting surface. FIG. 6 is a schematic cross-sectional view of the sanitary napkin in its natural state, taken along line III-III of the sanitary napkin shown in FIG. FIG. 6 is a cross-sectional view schematically showing the IV-IV line cross-section of the sanitary napkin shown in FIG. 5;

A sanitary napkin as a preferred embodiment of the absorbent article according to the present invention will be described below with reference to the drawings.
In the present invention, unless otherwise specified, the side that contacts the human body is referred to as the skin surface side, the skin contacting surface side, or the surface side, and the opposite side is referred to as the non-skin surface side, the non-skin contacting surface side, or the back surface side. It says. These terms are also used as terms that indicate relative positional relationships in the member structure of the absorbent article, even for members that do not have a surface that contacts the human body. In addition, the direction located on the front side of the human body when worn is referred to as the front, and the direction located on the rear side is referred to as the rear. The normal direction of the front surface or back surface of the absorbent article is referred to as the thickness direction.

As shown in FIGS. 1 to 3, a sanitary napkin 10A (hereinafter also referred to as a napkin 10A) includes a surface layer 1 on the skin-contacting side, a back layer 2 on the non-skin-contacting side, and a surface layer 1. It has a liquid-retentive absorbent layer 3 disposed between it and the back layer 2 . The surface layer 1 has liquid permeability to send liquid into the absorbent layer 3, and the back layer 2 has liquid leakage prevention properties. The surface layer 1 and the back layer 2 are sized to cover both sides of the absorbent layer 3 and extend outward from the outer edge of the absorbent layer 3 .
The napkin 10 also has a pair of three-dimensional guard portions 9 on the side of the surface layer 2 that contacts the skin. The three-dimensional guard portion 9 includes side sheets 5 and elastic members 4 . This three-dimensional guard section 9 will be described later.

The napkin 10A has a vertically long shape in plan view. The surface layer 1, the back layer 2, and the absorption layer 3 are similarly elongated in plan view. In this vertically elongated shape, the longitudinal direction is defined as the vertical direction Y, and the direction perpendicular to the vertical direction Y is defined as the width direction X. The vertical direction Y corresponds to the direction in which the abdomen, crotch, and back of the wearer are connected when the napkin 10A is worn. The width direction X corresponds to the direction in which the left and right legs of the wearer's crotch are connected. In this specification, the longitudinal direction Y and the width direction X indicate the direction of the napkin 10A in plan view, and at the same time, the direction of each constituent member in plan view.

The napkin 10A has, in the longitudinal direction Y, an intermediate portion C including a portion corresponding to the excretion point of the wearer. Further, it has a front portion F arranged on the lower abdomen side in front of the intermediate portion C and a rear portion R arranged on the rear buttock side. In addition, in the middle portion C, there is a liquid receiving region C1 in the widthwise central portion that faces the excretion point and directly receives the excreted fluid such as menstrual blood.

The division positions of the intermediate portion C, the front portion F, and the rear portion R can be appropriately set according to the length of the absorbent article set according to the purpose of use. Regardless of whether the shorts are for daytime use or nighttime use, when the shorts are provided with wing portions 6 that are bent and fixed to the crotch portion, the region along the vertical direction where the wing portions 6 are present becomes the intermediate portion C. The napkin 10A of this embodiment shows an example of a shape set for use at night, etc., the front part F and the middle part C are set to have substantially the same length, and the rear part R is the middle part C is set longer than In the case of a shape set for daytime use, the length in the vertical direction is divided into three equal parts, and the front part F, middle part C and rear part R are set, and the napkin for daytime use without the wing part 6 , then the intermediate part follows this setting. Regardless of the shape of the napkin 10A, the intermediate portion C can generally be set as a portion located at a constant distance from the front portion F. As shown in FIG. Furthermore, adult diapers, baby diapers, and incontinence pads have a front portion F, a middle portion C, and a rear portion R, which are divided into three equal parts in the vertical direction.

Furthermore, in the napkin 10A, the side sheet 5 and the back layer 2 extend outward in the width direction of the absorbent layer 3, and serve as wing portions 6, which are means for fixing to clothes and the like, and means for preventing leakage of excrement to the rear. A rear flap portion 8 is formed. In this laminated structure, the outer peripheral edge of the napkin 10A has an outer peripheral seal portion 15 joined without the absorbent layer 3 intervening. The napkin 10A also has leak-proof grooves 7 compressed from the surface layer 1 to the absorbent layer 3 . The leak-proof groove 7 has, as shown in FIG. . The wing portion 6, the rear flap portion 8, and the leakage-preventing groove 7 can be appropriately set according to the purpose of use of the article, and the napkin 10A may not have them. Further, the napkin 10A may include a liquid-permeable liquid diffusion layer narrower than the absorbent layer 3 and other constituent members.

Next, the aforementioned three-dimensional guard section 9 will be described in detail.

A pair of three-dimensional guard portions 9, 9 are arranged on both sides along the longitudinal direction Y of the napkin 10A. Specifically, it is laminated on both sides of the skin-contacting surface of the surface layer 1 over substantially the entire length in the vertical direction.

The three-dimensional guard portion 9 includes side sheets 5 and elastic members 4 . The elastic member 4 has elasticity in the longitudinal direction Y of the napkin 10A.
The three-dimensional guard portion 9 includes a base end portion 9B fixed to the surface layer 1 by a base end fixing portion 11 in a region D where the side sheet 5 and the surface layer 1 overlap in the natural state of the napkin 10A, and a base end portion 9B fixed to the surface layer 1 and a wearer side and an upright portion 9A. The three-dimensional guard portion 9 extends in the vertical direction Y from the intermediate portion C of the napkin 10A to the front portion F and the rear portion R, and is secured by the front and rear end fixing portions 12 at the front portion F and the rear portion R. 9 is lodged and joined to the surface layer 1 .

The "upright portion" 9A referred to here means a region that includes the tip portion 9C of the three-dimensional guard portion 9, and is located on the inner side in the width direction X of the base end portion 9B and rises planarly toward the wearer. Specifically, the "upright portion" 9A extends from the side sheet 5 and the elastic member 4 on the inner side in the width direction X of the base end fixing portion 11 and on the inner side in the longitudinal direction Y of the front and rear end fixing portions 12. It is configured. Further, the “tip portion” 9C referred to here means the innermost edge portion in the width direction X of the upright portion 9A. As shown in FIG. 2, in the napkin 10A, the standing portion 9A of the three-dimensional guard portion 9 is on the inner side in the width direction X than the base end portion 9B. A tip portion 9C of the upright portion 9A is arranged on the skin contact surface side (upper side) on the inner side in the width direction X of both sides along the longitudinal direction Y of the surface layer 1 .
In more detail, the upright portion 9A and the proximal end portion 9B of the three-dimensional guard portion 9 are as follows.

The base end portion 9</b>B includes a portion of the side sheet 5 that overlaps the surface layer 1 . A portion of the side sheet 5 is referred to as a proximal side sheet portion 5B, and a portion of the surface layer 1 overlapping the proximal side sheet portion 5B is referred to as a proximal side surface layer portion 1B. The base end side seat portion 5B constituting the base end portion 9B extends in the longitudinal direction Y from the intermediate portion C to the front portion F and the rear portion R. As shown in FIG.
The proximal side sheet portion 5B is joined to the proximal side surface layer portion 1B at the proximal fixing portion 11 arranged along the longitudinal direction Y. As shown in FIG. In addition, the base end side seat portion 5B is joined to the surface layer 1 at the front portion F and the rear portion R by the base end fixing portion 11 and the front and rear end fixing portions 12 (12B).

The standing portion 9</b>A includes a portion where the side sheet 5 extends inward in the width direction X from the base end portion 9</b>B and the elastic member 4 . The portion of the side sheet 5 is called an upright side sheet portion 5A, and the portion of the surface layer 1 overlapping the upright side sheet portion 5A in a natural state is called an upright side surface layer portion 1A. The standing side seat portion 5A and the elastic member 4 constituting the standing portion 9A are arranged to extend in the vertical direction Y from the intermediate portion C to the front portion F and the rear portion R. As shown in FIG.
As shown in FIG. 2, in the napkin 10A, the standing side sheet portion 5A is folded back to form a double structure, and an elastic member 4 is arranged in the vertical direction near the inner folded portion of the double structure. there is In the napkin 10A, the portion including the elastic member 4 is the tip portion 9C of the standing portion 9A. At the distal end portion 9C, the elastic member 4 is arranged in a vertically elongated state. The front and rear ends of the elastic member 4, together with the upright side seat portion 5A at that position, are attached to the front and rear end fixing portions 12 (12A) and 12 (12A) of the front portion F and the rear portion R of the napkin 10A as shown in FIGS. 12A). Therefore, the elastic member 4 expands and contracts between the fixed front and rear ends. In the natural state (relaxed state) of the napkin 10, the contractile force of the elastic member 4 causes the upright side sheet portion 5A to contract and rise from the base end portion 9B toward the wearer's skin. When the napkin 10A is worn, the upright portion 9A contacts the wearer's skin on the side of the skin contact surface of the surface layer 1, thereby suppressing lateral leakage of excrement. In addition, the upright portion 9A follows the deformation of the wearer's skin well due to the elastic force of the elastic member 4, and acts to maintain contact with the skin.

In the napkin 10A shown in FIG. 1, the front and rear end fixing portions 12 have the front and rear end fixing portions 12A and the front and rear end fixing portions 12B. In FIG. 1, the front and rear end fixing portions 12A have a substantially rectangular shape in plan view, and the front and rear end fixing portions 12B have a shape in which linear joint portions are connected in a wave shape in plan view. The shape of the front and rear end fixing portions 12 (12A and 12B) in plan view is not particularly limited to that shown in FIG. The shape of the front and rear end fixing portions 12 may be linear with a certain thickness, may be rectangular occupying a certain area, or may be a combination thereof. Moreover, when it is linear, a plurality of lines may be arranged in parallel or in a wavy form. Further, it is optional to use these front and rear end fixing portions 12A and 12B together, and only one of them may be used, or a fixing portion having a different form from these may be used.

The posterior fixation portions 12 (12A, 12B) and the aforementioned proximal fixation portion 11 can be formed by various means in this type of article. For example, bonding with an adhesive, pressure bonding by embossing, and the like can be mentioned. Examples of adhesives include hot-melt adhesives.

The standing portion 9A may have a laminated structure including a double structure as described above, or may not have a laminated structure. In the case of a laminated structure, the laminated structure may be formed so as to reach the base end portion 9B, or may be formed only in the vicinity of the folded portion including the elastic member 4 . Further, the number of elastic members 4 is not limited to one shown in FIG. 2, and may be plural.

The napkin 10A contains a cooling sensation agent in at least a part of the standing portion 9A of the three-dimensional guard portion 9. As shown in FIG. It is preferable that the cooling sensation agent is contained at least in the tip 9C of the upright portion 9A and the portion around the tip 9C that comes into contact with the wearer's skin. The term "cooling agent" as used herein means a cooling agent that can be worn without volatilizing and stimulating thermoreceptors on the skin and/or mucosal surface of the wearer to change the temperature on the skin and/or mucosal surface. It is an agent that can make a person feel a cool feeling and an exhilarating feeling.

By containing the cooling sensation agent as described above, even when the napkin 10A separates from the skin surface due to changes in the wearer's posture, etc., the standing portion 9A of the three-dimensional guard portion 9 follows and contacts the skin surface. can be maintained, and a stable cooling effect can be imparted to the wearer. In addition, in a mode in which the center of the absorbent layer 3 in the width direction is thicker than the side edges 3E to increase the liquid absorption capacity, the cooling sensation agent is made to follow the skin surface at the positions of the side edges 3E that are easily separated from the skin surface. Similarly, it is possible to impart a stable cooling effect to the wearer.

As shown in FIG. 4A, the three-dimensional guard portion 9 containing a cooling agent has a plurality of convex portions on the surface of the standing side sheet portion 5A that constitutes the standing portion 9A when the napkin 10A is in a natural state. It is preferable to have a relief structure 53 having 51 and recesses 52 . In this case, it is preferable that the basis weight of the cooling agent in the concave portions 52 is larger than that in the convex portions 51 . By relatively reducing the amount of the cooling sensation agent contained in the protrusions 51 that preferentially contact the wearer's skin, the direct stimulation of the skin by the cooling agent is suppressed, and the cooling sensation becomes stronger. You can prevent too much. In addition, the cooling sensation agent contained in the concave portion 52 can increase the durability of the cooling sensation.

The term "cooling agent basis weight" as used herein refers to the content of the cooling agent per unit area. The basis weight of the cooling agent can be measured by the following method.

(Presence or absence of cooling agent, method for measuring content)
The cooling agent can be extracted from the target member or site of the absorbent article with a solvent, and the extracted solution can be analyzed by gas chromatography (GC). The measurement is performed with a flame ionization detector (FID) attached to a gas chromatograph, and can be measured with, for example, 7890A manufactured by Agilent Technologies. The relation between the concentration of the compound constituting the cooling agent and the peak area is drawn in advance as a calibration curve, and the quantitative work is performed based on the calibration curve.
A case where the cooling sensation agent contains menthyl lactate and/or menthol will be described as an example. Methanol is used as a solvent to extract menthyl lactate and/or menthol from the target member or site. Using methanol as a solvent, prepare in advance menthyl lactate solutions and/or menthol solutions with different concentrations of about 3 to 5 levels, calculate the peak area of each concentration from the GC chromatogram, and use n-pentyl alcohol as a standard sample. is used to create a calibration curve plotting the peak area against the concentration of the standard sample. By analyzing the extract under the same conditions as the analysis for creating the calibration curve, the peak areas obtained are applied to the calibration curve to calculate the amount of menthyl lactate and/or the amount of menthol. Alternatively, the amount of the cooling agent per unit area (basis weight of the cooling agent) is obtained by dividing the amount of menthyl lactate and/or menthol thus obtained by the area of the target member or the target site sampled in advance. can be done. In order to know the amount of cooling agent for each target member or target part of the product, the product is disassembled in a chamber at 5° C., and the material part to be measured is taken out for analysis. In addition, the obtained amount of menthyl lactate and/or menthol is divided by the length (mm) in the length direction of the absorbent article and multiplied by 100 to obtain the amount of cooling sensation agent per 100 mm of product length. can be done.

The ratio (W2/W1) of the cooling agent basis weight (W2) in the concave portions 52 and the cooling agent basis weight (W1) in the convex portions 51 is set to 1 from the viewpoint of facilitating stable acquisition of the gentle cooling sensation stimulation. 0.05 or more and 15 or less are preferable, 1.3 or more and 8 or less are more preferable, and 1.5 or more and 5 or less are still more preferable.

The basis weight (W3) of the cooling agent contained in the standing portion 9A (the standing side sheet portion 5A and the elastic member 4) is appropriately set according to the type of the cooling agent used. , from the viewpoint of imparting a stable and mild cooling effect, it is preferably 0.05 g/m ² or more and 5 g/m ² or less, more preferably 0.1 g/m ² or more and 3 g/m ² or less, and 0.15 g/m 2 or more. It is more preferably m ² or more and 1.5 g/m ² or less.

The concave-convex structure 53 can be caused by contraction of the upright side sheet portion 5A accompanying contraction of the elastic member 4 . As shown in FIGS. 4A and 4B, the uneven structure 53 is formed by joining the elastic member 4 and the upright side sheet portion 5A by joining portions 54 intermittently arranged in the vertical direction. may be In this case, the convex portion 51 is arranged between the joint portions 54 , 54 and the concave portion 52 is arranged at the position of the joint portion 54 . It is preferable that the uneven structure 53 is formed by the joint portion 54 because the arrangement interval and height difference between the protrusions 51 and the recesses 52 can be suitably set within a desired range. The joining portion 54 is preferably made of, for example, various adhesives used for this type of article, such as hot-melt adhesives.

As shown in FIGS. 4(A) and 4(B), when the elastic member 4 and the upright side sheet portion 5A are joined by the adhesive of the joining portions 54 intermittently arranged in the longitudinal direction, the cooling sensation agent is used as described above. A high affinity with the adhesive is preferred. The term "high affinity" as used herein means that the cooling sensation agent migrates per unit weight or retains the adhesive more than the elastic member 4 and the standing side sheet portion 5A, which constitute the standing portion 9A. Either one or both are high. When a cooling agent that has a high affinity with an adhesive is used, the cooling agent migrates toward the area where the adhesive exists and is retained on the surface or inside of the adhesive, thereby providing a cooling sensation at the area where the adhesive exists. The basis weight increases. Due to this migration of the cooling agent, even if the cooling agent is evenly coated on the entire surface of the standing portion 9A during manufacturing, the basis weight of the cooling agent in the portion where the adhesive exists is the same as the basis weight of the cooling agent in the other portions. The basis weight of the cooling agent can be suitably controlled so as to increase with respect to the amount. As a result, the above-described effect of reducing excessive irritation to the skin due to the difference in basis weight of the cooling agent between the convex portions 51 and the concave portions 52 can be more favorably exhibited. In addition, since volatilization of the cooling sensation agent is suppressed by the action of the adhesive, the cooling sensation agent contained in the concave portions 52 in large amounts enhances the persistence of the cooling sensation even if the cooling sensation material of the convex portions 51 is reduced. be able to. A cooling agent that has a high affinity with the adhesive will be described later.

Moreover, it is preferable that a cooling sensation agent is contained between the side sheet 5 and the surface layer 1 in the region D where the side sheet 5 and the surface layer 1 overlap each other in the natural state. Here, "the cooling agent is contained between the side sheet 5 and the surface layer 1" means that the cooling agent is contained in either one or both of the side sheet 5 and the surface layer 1. . Specifically, in addition to the member constituting the standing portion 9A, at least one of the standing side surface layer portion 1A, the proximal side seat portion 5B, the proximal side surface layer portion 1B, and the proximal fixing portion 11 is provided with a cold feeling. agent is preferably included. In particular, it is more preferable that the base end fixing portion 11, the base end side sheet portion 5B overlapping therewith, and the base end side surface layer portion 1B contain the cooling sensation agent. As a result, the region D becomes a reservoir for the component of the cooling agent, and the cooling sensation lasts longer.
In this region D, the base end fixing portion 11 that joins the base end side sheet portion 5B and the base end side surface layer portion 1B is arranged along the longitudinal direction Y at the base end portion 9B of the three-dimensional guard portion 9, as described above. distributed. The base end fixing portion 11 is preferably made of an adhesive, and in the area D, the basis weight of the cooling agent in the portion where the adhesive is applied is the same as the cooling agent in the portion where the adhesive is not applied. It is more preferable that the amount is greater than the basis weight. The term "site where the adhesive is applied" as used herein means the proximal fixing portion 11 made of adhesive, the proximal side sheet portion 5B and the proximal side surface layer portion 1B overlapping therewith. In addition, the "part where the adhesive is not applied" includes the side sheet 5 (the standing side sheet portion 5A, the base end side sheet portion 5B) arranged in the region D, the elastic member 4, the surface layer (the standing side surface This is the portion of the layer portion 1A and the base-end-side surface layer portion 1B) excluding the above-mentioned "part where the adhesive is applied". The adhesive may be longitudinally continuous or spaced apart. Such distribution of the cooling agent can be formed by using a cooling agent having a high affinity for the adhesive as the cooling agent, as described above. Even if the remaining amount of the cooling agent in the three-dimensional guard portion 9 is reduced, the appropriate cooling sensation can be maintained for a longer period of time due to the cooling agent transferred to the portion where the adhesive is applied.

At least part of the region containing the cooling sensation agent of the three-dimensional guard part 9 overlaps with a part near the inner side of the side edge part 3E in the width direction X of the absorbent layer 3 in plan view of the napkin 10A in the natural state. is preferred. Specifically, the cooling sensation agent is arranged on the standing side sheet portion 5A and the elastic member 4, and this region is on the inner side of the side edge portion 3E in the width direction X of the absorbent layer 3, and the side edge portion Preferably, it overlaps with the portion near 3E. As a result, before the excreted liquid reaches the side edge portion 3E in the width direction X of the absorbent layer 3, the cooling sensation effect of the cooling sensation agent of the three-dimensional guard portion 9 is exhibited, and the wearer is notified when to replace the napkin 10A. can let you know. At this time, the adhesion of the excreted liquid to the area where the cooling agent is arranged enhances the cooling effect, making it easier to judge when to replace the mask. In general, if the absorbent layer 3 is used until the excreted liquid overflows, the diffusion of the liquid suddenly becomes faster and leakage is more likely to occur. On the other hand, in the napkin 10A of the present embodiment, the replacement time of the napkin 10A can be determined by the stimulation of the cooling sensation agent before the liquid leaks outward in the width direction.

In a plan view, the overlapping range of the upright side sheet portion 5A and the portion near the inner side of the side edge portion 3E is, when the entire width of the absorbent layer is 100%, from the viewpoint of both preventing leakage and ensuring the absorption amount. The total overlapping range is preferably 1% or more and 50% or less, more preferably 5% or more and 40% or less, and even more preferably 10% or more and 30% or less.

As described above, the three-dimensional guard part 9 has the front and rear end fixing parts 12 fixed to the surface layer 1 so as not to stand up in the longitudinal direction Y (the front part F and the rear part R of the napkin 10A). It is preferable that the front and rear end fixing portions 12 contain a cooling agent. At least one of the front and rear end fixing portions 12A and 12B is preferable as the front and rear end fixing portions 12 containing the cooling agent, and both are more preferable. Thereby, a cooling sensation effect can be obtained in a wide range from the front to the rear of the napkin 10A.

The elastic member 4 of the three-dimensional guard portion 9 is preferably colored in a color that gives a feeling of coldness. Here, the “coldness-feeling color” refers to a color that visually gives a sense of coldness, such as being recognized as the color of low-temperature water, ice, or the like. Specifically, blue (including light blue), green, etc. are preferred, and blue is preferred. The coolness can be emphasized more by the visual effect.

Furthermore, in the napkin 10A, the wing portion 6 and/or the rear flap portion 8 may also contain a cooling agent. A cooling sensation effect can be obtained in a wide range of the napkin 10A.

Next, FIGS. 5-7 show a sanitary napkin 10B (hereinafter also referred to as napkin 10B), which is another preferred embodiment of the absorbent article of the present invention. Regarding the napkin 10B, the configuration different from that of the napkin 10A will be described, and the description of the same configuration will be omitted. The napkin 10B differs from the napkin 10A in the configuration of the three-dimensional guard portion 9, and other than that, the items related to the napkin 10A can be applied.

As shown in FIGS. 5 and 6, in the napkin 10B, the upright portion 9A extends inward in the width direction X from the base end portion 9B and is folded back outward in the width direction X from there. have a shape. The portion of the upright portion 9A that is folded outward in the width direction X extends to a region positioned outside in the width direction from both sides of the surface layer 1 in the width direction X. As shown in FIG. In the upright portion 9A, the folded portion (folded portion) is the innermost edge portion in the width direction X, and is the leading end portion 9C of the upright portion 9A.
Since the upright portion 9A has a portion folded outward in the width direction X, the overlapping portion between the absorbent layer 3 and the three-dimensional guard portion 9 is reduced and the absorbent surface is widened, so that the excreted liquid can be removed more effectively. can be absorbed. In addition, the length in the width direction of the upright portion 9A of the three-dimensional guard portion 9 (the length in the width direction when the upright portion 9A is folded back) can be made longer, and the leakproofness can be improved.

Like the napkin 10A, the napkin 10B also contains a cooling sensation agent in at least a part of the upright portion 9A.

In the napkin 10B, three elastic members 4 are spaced apart inside the double structure forming the standing portion 9A. By arranging a plurality of elastic members 4, the standing portion 9A that is long in the width direction can be effectively raised. As shown in FIGS. 5 and 7, in the napkin 10B, the three-dimensional guard part 9 has front and rear end fixing parts 12 fixed to the surface layer in a front part F and a rear part R so as not to stand upright. In the rear portion R, the front and rear end fixing portions 12 are arranged closer to the intermediate portion C than in the case of the napkin 10A. Specifically, the front and rear end fixing portions 12 are arranged around a half of the length of the rear portion R in the vertical direction. By moving the position of the front and rear end fixing portions 12 in this way, the vertical length of the upright region of the free end portion 9A can be set within a desired range.

As materials for forming the members constituting the sanitary napkins 10A and 10B, those used for this type of article can be used without particular limitation. Hereinafter, the sanitary napkins 10A and 10B are collectively referred to as the sanitary napkin 10 (hereinafter also referred to as the napkin 10).

As a cooling agent, without stimulating thermoreceptors on the surface of either or both of the skin and mucous membrane of the wearer to change the temperature on the surface of either or both of the skin and mucous membrane, Various agents can be used that are capable of imparting a refreshing sensation to the wearer. Examples thereof include those described in paragraphs [0006] to [0086] of JP-A-2015-12918, such as cyclohexyl derivatives, cyclohexanol derivatives, and carboxamides. Among them, water-insoluble or sparingly water-soluble ones are preferable from the viewpoints of refreshing smell, quickness, and persistence. Since water-insoluble or sparingly water-soluble cooling sensation agents are less likely to migrate to the non-skin surface side together with body fluids, the cooling sensation is likely to last. Menthyl lactate and menthol are preferred as water-insoluble or sparingly water-soluble ones. The term "water-insoluble or poorly water-soluble" as used herein refers to a solubility of 1 g or less per 1 L of water at 25°C. It is said to be less soluble.
The cooling agent preferably has a high affinity with the adhesive. The cooling sensation agent having high affinity with the adhesive is appropriately set depending on the adhesive used, but preferably contains at least one of menthol and menthyl lactate. When the cooling sensation agent contains at least one of menthol and menthyl lactate, preferable components contained in the adhesive include styrene/ethylene/butylene/styrene copolymer, styrene/butadiene/styrene block copolymer, etc.
Cooling agents can be incorporated into the napkin 10 by a variety of methods. For example, it may be contained in the napkin 10 in a state of being dissolved in a solvent, or may be contained without using a solvent. The cooling agent may also be contained in the napkin 10 with a delivery means such as microencapsulation. Various commonly used solvents can be employed as the solvent. Examples include dipropylene glycol.

It is particularly preferable to include menthol and menthyl lactate as the cooling sensation agent because the cooling sensation effect can be felt quickly after wearing, and the cooling sensation effect can be felt quickly and mildly, and the durability can be enhanced. From the same point of view, the content of menthol and menthyl lactate is preferably 0.01 or more, more preferably 0.02 or more, more preferably 0.2 or less, and further 0.15 in terms of the mass ratio of the former/latter. The following are preferred.

As the absorbent layer 3, various forms commonly used in absorbent articles can be employed without particular limitation. For example, a hydrophilic fiber stack or a mixed stack of hydrophilic fibers and superabsorbent polymer material may be covered with a hydrophilic covering sheet. Alternatively, it may be composed of a thin absorbent sheet in which a superabsorbent polymer material is sandwiched and fixed between two sheet-like fiber layers made of hydrophilic fibers. In the formation of the absorbent sheet, the superabsorbent polymer material can be integrated by utilizing the adhesive force that is exhibited by wetting, or by using a separately added binder such as an adhesive agent or adhesive fiber. Preparation can be carried out by various commonly used methods, either wet or dry.
The absorbent sheet has a thickness of 3.0 mm or less, and since the superabsorbent polymer material is dispersed in the planar direction of the sheet, it is difficult to cause gel blocking and has high absorbency. Examples thereof include those described in paragraphs [0019] to [0131] of JP-A-8-246395.

The absorbent layer 3 preferably has a laminated structure in which absorbent sheets are folded. The absorbent layer 3 shown in FIGS. 2 and 3 is composed of an absorbent sheet containing the aforementioned superabsorbent polymer and hydrophilic fibers. It has a structure in which absorbent sheets are laminated. More specifically, the absorbent layer 3 has a main absorbent sheet 31 and a central absorbent sheet 32 arranged on the non-skin surface side of the main absorbent sheet 31, and both absorbent sheets are folded. It has a laminated structure. The above-described leak-proof grooves 7 are preferably arranged in the main body absorbent sheet 31 .

The main absorbent sheet 31 extends outward from at least a part of the periphery of the central absorbent sheet 32 and is laminated on the central absorbent sheet 32 . A more specific configuration will be described below.
The main absorbent sheet 31 has a folded structure in which both ends in the width direction are overlapped on the back layer 2 side and folded in three. The main absorbent sheet 31 has a length extending from the intermediate portion C to the front portion F and the rear portion R, and forms the outer shape of the absorbent layer 3 .
The central absorbent sheet 32 has a folded structure in which both ends in the width direction are overlapped on the surface layer 1 side and folded in three. In the folded state, the central absorbent sheet 32 is narrower than the folded main absorbent sheet 31, has a shorter vertical length than the main absorbent sheet 31, and is located at the center of the intermediate portion C in the width direction. is distributed to The central absorbent sheet 32 is housed inside the folded structure of the main absorbent sheet 31 . In this arrangement, the central absorbent sheet 32 is arranged at least closer to the non-skin surface side than the main absorbent sheet 31 is to the skin surface side. Also, the central absorbent sheet 32 is preferably positioned in the middle portion of the napkin 10A.

The folding structure of the central absorbent sheet 32 is not limited to the mode shown in FIG. For example, both ends in the width direction of the central absorbent sheet 32 may be folded back to the skin side and the non-skin side, respectively, in an S-shaped manner, folded in two in the width direction, or in three in the width direction. It may be folded so that the lengths of the folded portions are equal.

The folding structure of the main body absorbent sheet 31 is not limited to the mode shown in FIG. For example, it may be similar to the folded structure of the central absorbent sheet 32 . Alternatively, it may have a structure in which two sheets separated into a skin side and a non-skin side are laminated. Furthermore, the present invention is not limited to the embodiment in which the central absorbent sheet 32 is enclosed inside the folded structure of the main body absorbent sheet 31, and instead of being enclosed, the central absorbent sheet is placed on the non-skin surface side of the folded structure of the main body absorbent sheet 31. 32 may be laminated.

No matter what laminate structure the absorbent layer 3 has, it is preferable that the overlapping portions of the absorbent sheets are not joined.

Hydrophilic fibers constituting the absorbent layer 3 include those obtained by subjecting hydrophobic fibers to a hydrophilic treatment, and those that are themselves hydrophilic. In particular, those that are themselves hydrophilic and have water retentivity are preferred. Preferred examples of the latter hydrophilic fibers include natural fibers, regenerated cellulose fibers, and semi-synthetic fibers. As the hydrophilic fiber, pulp and rayon are particularly preferable, and pulp is more preferable. Crosslinked cellulose fibers obtained by cross-linking either one or both of cellulose fibers intramolecularly and/or intermolecularly or bulky cellulose fibers obtained by mercerizing wood pulp may also be used. The pulp includes, but is not limited to, wood pulp such as softwood kraft pulp or hardwood kraft pulp, natural cellulose fibers such as cotton pulp or straw pulp, and the like. One or more of these pulps can be used.

The superabsorbent polymer material constituting the absorbent layer 3 is obtained, for example, by polymerizing a water-soluble ethylenically unsaturated monomer containing acrylic acid or an acrylate as a main component, optionally with the addition of a cross-linking agent. Hydrogel materials are included. Also, polyethylene oxide, polyvinylpyrrolidone, crosslinked products of sulfonated polystyrene and polyvinylpyridine, saponified products of starch-poly(meth)acrylonitrile graft copolymers, starch-poly(meth)acrylic acid graft copolymers, starch-poly( A hydrolyzate of a meth)acrylic ester graft copolymer and the like can be mentioned. These superabsorbent polymer materials can be used singly or in combination of two or more. A material capable of absorbing and retaining liquid 20 times its own weight or more and gelling is preferred.
As for the shape of the superabsorbent polymer material, various shapes used for the absorbent layer can be used without particular limitation. For example, it may be spherical, granular, fibrous, bale-shaped, or massive.

Various liquid-permeable materials can be used for the surface layer 1 . Considering good touch, a hydrophilic nonwoven fabric is preferred, a thermal bond nonwoven fabric is more preferred, and an air-through nonwoven fabric is particularly preferred. It is preferable that the fibers constituting the nonwoven fabric are thermoplastic resin fibers that have been subjected to a hydrophilic treatment, and that the fibers are three-dimensional crimped fibers such as secondary crimps or tertiary crimps. Specifically, polyethylene, polypropylene, polyester, nylon, and composite fibers of these are made, cut to a predetermined length, and before forming staples, the fibers are coated with various hydrophilizing agents. . Hydrophilizing agents include various alkylsulfonates represented by α-olefin sulfonates, acrylates, acrylate/acrylamide copolymers, esteramides, salts of esteramides, polyethylene glycol and derivatives thereof, water Hydrophilic agents commonly used such as polyether resins, various silicone derivatives, various sugar derivatives, and mixtures thereof can be used.

As the back layer 2, various materials having leakproof properties can be used. For example, a non-moisture-permeable or moisture-permeable film alone, a laminate of a film and a non-woven fabric, or a water-repellent non-woven fabric (SMS, SMMS, etc.) can be used. It is most preferable to use the non-moisture-permeable film alone as the leak-proof material from the viewpoint of cost and matching with the anti-slip adhesive.

As the liquid diffusion layer, a layer having hydrophilicity and excellent liquid diffusion properties is preferable. Examples include nonwoven fabrics containing thermoplastic fibers. Nonwoven fabrics obtained by various manufacturing methods can be used as the nonwoven fabric. For example, an air-through nonwoven fabric obtained by forming heat-bonding points between fibers by an air-through method in a fiber web obtained by a carding method or an air-laid method, and forming heat-bonding points between fibers by a heat roll method on a fiber web obtained by a carding method. Various nonwoven fabrics such as heat-rolled nonwoven fabrics, heat-embossed nonwoven fabrics, spunlaced nonwoven fabrics, needle-punched nonwoven fabrics, and resin-bonded nonwoven fabrics can be used.

The elastic member 4 is not particularly limited, but it is made by forming a stretchable material such as natural rubber, polyurethane resin, foamed urethane resin, hot-melt stretchable member into a thread shape (thread rubber) or band shape (flat rubber). It is preferably used.

As the side sheet 5, a water-repellent nonwoven fabric is preferable. Various water-treated nonwoven fabrics can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric, or the like is used.

The absorbent article of the present invention is not limited to the sanitary napkins of the above-described embodiments, and can be applied to panty liners, incontinence pads, incontinence pads, disposable diapers, and the like. In addition, it is effective not only for menstrual blood but also for urine, vaginal discharge, loose stool, and the like. In addition to the constituent members described above, other members may be incorporated as appropriate according to the application and function.

Moreover, when the absorbent article of the present invention is an article such as a sanitary napkin or a panty liner that is carried in a bag or the like for each product, it is preferable that the absorbent article is individually wrapped. Specifically, it is preferable that the absorbent article individually wrapped body is folded in the longitudinal direction so that the surface layer faces inside and wrapped with an outer material for individual packaging. The use of an individual package makes it possible to maintain the hygiene of the surface layer (use surface) that comes in contact with the skin while maintaining the high portability of the article, thereby enhancing the convenience of the user.

REFERENCE SIGNS LIST 1 surface layer 1A upright side surface layer portion 1B base end side surface layer portion 2 back layer 3 absorbent layer 3E width direction both edges 4 elastic member 5 side sheet 5A upright side sheet portion 5B base end side sheet portion 6 wing portion 7 leakage prevention Groove 8 Back flap part 9 Solid guard part 9A Standing part 9B Base end part 9C Tip part (of standing part) 10A, 10B Sanitary napkin 11 Base end fixing part 12 Front and rear end fixing part 15 Peripheral seal part 31 Main body absorbent sheet 32 Central absorbent sheet 54 joint

Claims (5)

a longitudinal direction corresponding to a direction in which a wearer's abdominal portion, crotch portion, and back portion are connected; An absorbent article having a longitudinal direction and a width direction perpendicular to each other,
A pair of three-dimensional guard portions are provided on both sides along the longitudinal direction of the absorbent article,
The three-dimensional guard section includes a side sheet and a longitudinally stretchable elastic member, and has a base end portion fixed to the surface layer and a standing portion facing the wearer ,
The three-dimensional guard part has an uneven structure including a plurality of protrusions and recesses between the protrusions on the surface of the side sheet in the standing part in the natural state of the absorbent article,
An absorbent article comprising a cooling agent in at least part of the standing portion, wherein the cooling agent basis weight of the concave portion is larger than that of the convex portion . 2. The absorbent according to claim 1 , wherein the side sheet and the elastic member are fixed with an adhesive intermittently arranged in the vertical direction in the standing portion, and the cooling agent has a high affinity with the adhesive. sexual goods. The cooling sensation agent is contained between the side sheet and the surface layer in the region where the side sheet and the surface layer overlap in the natural state of the absorbent article, and the base end portion includes the cooling sensation agent. An adhesive that joins the side sheet and the surface layer is arranged along the longitudinal direction,
3. The cooling agent according to claim 1 or 2, wherein, in said region, the basis weight of the cooling agent in the portion where the adhesive is applied is greater than the basis weight of the cooling agent in the portion where the adhesive is not applied. absorbent article. At least a part of the region containing the cooling sensation agent of the three-dimensional guard part overlaps with a part near the inner side of the side edge in the width direction of the absorbent layer in a plan view in which the absorbent article is in a natural state. 4. The absorbent article according to any one of 1 to 3 . 5. Any one of claims 1 to 4 , wherein the three-dimensional guard part has front and rear end fixing parts that are fixed to the surface layer so as not to be able to stand up in the front and rear in the vertical direction, and the cooling sensation agent is contained in the front and rear end fixing parts. 1. The absorbent article according to claim 1.

Images