WO2019092809A1

WO2019092809A1 - Absorbent article

Info

Publication number: WO2019092809A1
Application number: PCT/JP2017/040267
Authority: WO
Inventors: 大和益井; 木村　真由美
Original assignee: 花王株式会社
Priority date: 2017-11-08
Filing date: 2017-11-08
Publication date: 2019-05-16
Also published as: TW201922187A; JP6452907B1; TWI761567B; CN110022823A; JPWO2019092809A1; CN110022823B

Abstract

An absorbent article provided with an absorption layer (3), the absorbent article having a longitudinal direction (Y direction) and a width direction (X direction) orthogonal to the longitudinal direction, wherein: the absorbent article has a central portion (C) including a liquid-receiving region (C1) facing an excretion part of a wearer, and a front portion (F) and a rear portion (R) positioned at both ends of the central portion (C), along the longitudinal direction; the absorption layer (3) contains an agent for imparting a cooling sensation from the front portion (F) to the rear portion (R); the amount of agent for imparting a cooling sensation per unit area contained in the central portion (C) of the absorption layer (3) is the same as in the front portion (F) and the rear portion (R) or greater than in the front portion (F) and the rear portion (R); and the central portion (C) has a low-cooling-sensation region (34) in which the amount of agent for imparting a cooling sensation per unit area contained in a skin-side surface (3A) of the absorption layer (3) is less than in the front portion (F) and the rear portion (R).

Description

Absorbent articles

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

In absorbent articles such as sanitary napkins, when the excretory fluid is large or when used for a long time, etc., mure and stickiness may occur and the wearer may feel uncomfortable. On the other hand, conventionally, a technique for attempting to improve the feeling of wearing except this unpleasant feeling has been proposed by incorporating a cooling agent such as a refreshing agent into the absorbent article (for example, Patent Documents 1 to 3) ). The cooling agent volatilizes and stimulates TRPM8 and TRPA1 of the sensory nerve cells of the wearer's skin to change the receptor threshold, thereby giving a refreshing feeling.
Since the absorbent article described in Patent Document 1 addresses the problem that the cooling agent is consumed by excretion, the amount of the cooling sensation material in the area in contact with the excretory part of the wearer is larger than that in the other areas. doing. In addition, the absorbent articles described in

Patent Documents

2 and 3 address the problem of giving the wearer excessive irritation due to the refreshing agent, so in the planar direction of the articles, the absorbent articles described in the planar direction of the article are more The amount of freshener in other areas is increased.

JP, 2010-234031, A JP, 2010-234028, A JP, 2010-234027, A

The present invention is an absorbent article having a longitudinal direction and a width direction orthogonal to the longitudinal direction, and including an absorbent layer, including a liquid receiving area facing the wearer's excretory part along the longitudinal direction. It has a middle part and a front part and a back part located on the both end sides, and the absorption layer contains a cooling agent from the front part to the rear part, and a unit contained in the absorption layer The amount of cooling agent per area is equal to or greater than that of the front portion and the rear portion in the middle portion than in the front portion and the rear portion, and the middle portion is contained in the skin side of the absorbent layer The present invention provides an absorbent article having an area of low cooling sensation, wherein the amount of cooling agent per unit area is smaller than that of the front portion and the rear portion.

The above and other features and advantages of the present invention will become more apparent from the following description with reference to the accompanying drawings as appropriate.

BRIEF DESCRIPTION OF THE DRAWINGS It is a partially notched perspective view shown typically from the skin contact surface side in the state which expand | extended the sanitary napkin as one preferable embodiment of the absorbent article in this invention. It is a top view of an absorption layer. It is a sectional view showing an absorption layer in this embodiment typically, (A) is a sectional view showing an AA line section in alignment with a longitudinal direction of an absorption layer shown in Drawing 2, (B) in Drawing 2 FIG. 6 is a cross-sectional view showing a cross section taken along the line BB in the width direction of the absorbing layer shown. FIG. 3A is a cross-sectional view schematically showing an aspect in which the absorbent layer in the present embodiment has a high basis weight part, and FIG. 3A shows a cross section along the longitudinal direction of the absorbent layer having the high basis weight part FIG. 3B is a cross-sectional view corresponding to FIG. 3B showing a cross-section along the width direction of the absorbent layer having a high basis weight portion. FIG. 2 is a cross-sectional view schematically showing an aspect in which the absorbent layer has a laminated structure of absorbent sheets, with respect to a cross-section taken along line TT of the sanitary napkin shown in FIG. (A) to (D) are cross-sectional views showing other preferred examples of the folded structure of the central absorbent sheet.

Detailed Description of the Invention

The present invention relates to an absorbent article capable of maintaining a good effect of cooling sensation for the wearer's skin for a long time.

In an absorbent article containing a cooling agent, the skin of the wearer's so-called delicate area (the excretory part) has a small number of horny layers, and thus is susceptible to a strong sensation of cold. In addition, in the liquid receiving area of the napkin corresponding to the delicate area, the cold sensation is likely to be excessively effective due to the excretion.
As in the case of the absorbent article described in Patent Document 1, simply increasing the amount of the cooling agent in the area facing the wearer's excretory part (the liquid receiving area) may cause pain and discomfort, It may damage the feeling of wearing. On the other hand, as in the case of the absorbent articles described in

Patent Documents

2 and 3, when a large amount of the cooling agent is disposed outside the area facing the wearer's excretory part (the liquid receiving area), sufficient cooling sensation in the easily steamed part It will be difficult to sustain the effect.

On the other hand, the absorbent article according to the present invention can maintain a reasonably good cooling effect on the wearer's skin for a long time.

Hereinafter, a sanitary napkin (hereinafter also referred to as a napkin) 10 as a preferred embodiment of the absorbent article according to the present invention will be described with reference to the drawings.
In the present invention, unless otherwise specified, the side in contact with the human body is referred to as the skin side or the skin contact surface side or the surface side, and the opposite side is referred to as the non-skin side or the non-skin contact surface side or the back surface side. These are used also as a term which shows relative physical relationship in member composition of an absorptive article also about a member which does not have a field which contacts a human body. Moreover, the direction which is located in the front side of a human body at the time of wear is called front, and the direction which is located in the rear side is called back. The normal direction of the front surface or the back surface of the absorbent article is referred to as the thickness direction.

The napkin 10 has a liquid-retaining absorbent layer 3 as shown in FIG. In the present embodiment, the surface layer 1 is disposed on the skin contact surface side of the absorbent layer 3 and the back surface layer 2 is disposed on the non-skin contact surface side of the absorbent layer 3. The surface layer 1 has the liquid permeability that sends the liquid to the absorbing layer 3, and the back surface layer 2 has the leak resistance to the liquid. The surface layer 1 and the back surface layer 2 have a size that extends outward of the outer edge of the absorption layer 3 while covering both surfaces of the absorption layer 3. Furthermore, an intermediate fiber layer 4 having liquid diffusibility is provided between the surface layer 1 and the absorbent layer 3. Further, the side sheets 5 are laminated on both sides of the skin contact surface side of the surface layer 1. The side sheet 5 and the back surface layer 2 extend outward in the width direction of the absorbent layer 3 to form a wing portion 6 which is a fixing means to clothes and the like. The non-skin contact surface side of the wing portion 6 and the back surface layer 2 has an adhesive portion (not shown) for fixing the napkin 10 to clothes. In the laminated structure of this sheet, the outer peripheral edge of the napkin 10 is an outer peripheral seal portion 9 joined without the absorption layer 3 interposed.

The napkin 10 may include other structural members, and may have a form without any structural members other than the absorbent layer 3 such as the intermediate fiber layer 4 and the side sheets 5. Furthermore, it may have a leak-proof groove squeezed from the surface layer 1 to the absorbent layer 3, a plurality of embossments on the surface layer 1, and the like. In addition, the side sheet 5 may be left at the free end inward of both sides of the surface layer 1 while being bonded to the surface layer 1, and an elastic member or the like may be provided at the free end to prevent A leak cuff may be configured.

The napkin 10 has a longitudinally long shape having a longitudinal direction (Y direction) and a width direction (X direction) orthogonal to the longitudinal direction in a plan view. Moreover, the absorbent layer 3 is vertically long like the napkin 10. The longitudinal direction corresponds to the direction connecting the wearer's ventral side, crotch and dorsal side when the napkin 10 is worn. The width direction corresponds to the direction in which the left and right feet in the crotch of the wearer are connected. In the present specification, the longitudinal direction (Y direction) and the width direction (X direction) indicate the direction in plan view of the napkin 10 and the direction in plan view of the absorbent layer 3.

The napkin 10 has an intermediate portion C including a portion (a liquid receiving area C1 described later) facing the wearer's excrement portion along the longitudinal direction (Y direction), and a front portion F and a rear portion located on both ends thereof And R. The front part F is disposed to face the lower abdomen of the wearer, and the rear part R is disposed to face the buttocks side of the wearer.
In the middle part C, there is a liquid receiving area C1 facing the excretory part and directly receiving the excrement fluid at the central part in the width direction. The "width direction central portion" where the liquid receiving area C1 is, as shown in FIG. 2, is a range of a predetermined width extending laterally from the center line L in the width direction, and is wider than both widthwise end edges 39 of the absorbent layer 3 Say the part of the inner range. Specifically, it is a region that spreads laterally from the center line L in the width direction of the napkin 10 and is a portion in the range of 40% to 60% of the width of the absorbent layer. The middle part C, the liquid receiving area C1, the front part F and the rear part R indicate the divisions in the napkin 10 and the divisions in the absorbent layer 3 corresponding thereto.

The division positions of the middle portion C, the front portion F and the rear portion R may be appropriately set according to the length of the absorbent article set according to the purpose of use and the like. In the case of providing the wing portion 6 to be bent and fixed to the crotch portion of the shorts, the region along the longitudinal direction in which the wing portion 6 exists becomes the middle portion C. The napkin 10 of the present embodiment shows an example of a shape set for daytime use, etc., and the length in the longitudinal direction is equally divided into three to set the front part F, middle part C and rear part R In the case of a day napkin without the wings and wings, the middle part C follows this setting. In general, regardless of the shape of the napkin 10, the middle portion C can be set as a portion located at a certain distance from the front portion F. Furthermore, for adult or infant diapers and the like, and for urine collection pads and the like, the length in the longitudinal direction is equally divided into three, and the front part F, middle part C and rear part R are set.

The absorption layer 3 contains a cooling agent.
Specifically, the cooling agent is contained in the absorbent layer 3 from the front part F to the rear part R in a plan view of the absorbent layer 3 (see FIG. 2). The cooling agent volatilizes and stimulates the temperature receptors on the wearer's skin and / or mucosal surface to cool and refresh the wearer without changing the temperature on the skin and / or mucosal surface. It is an agent that can make you feel a sense.

The amount of cooling agent per unit area contained in the absorbent layer 3 is the same as the front part F and the rear part R or larger than the front part F and the rear part R in the middle part C. The amount of cooling agent per unit area in each of the middle portion C, the front portion F and the rear portion R specified here is the content of the portion across the entire width and thickness of the absorbing layer 3 in each region dividing the longitudinal direction It is. The cooling agent is contained in the entire longitudinal direction of the absorbent layer 3, and the absorbent layer part divided into the middle part C is contained compared to the absorbent layer part divided into the front part F and the rear part R. The amount of cooling agent per unit area is equal to or more than that.
When the amount of the cooling agent per unit area in the middle part C is equal to or more than that before and after that, the cooling sensation effect can be sustained for any part of the wearer. In particular, when the amount of the cooling agent in the middle portion C of the absorbent layer 3 is relatively large, it is possible to impart a cool feeling relatively longer to the vicinity of the excretory part of the wearer who is easily stuffed than in other parts. In the present specification, “the amount of cooling agent per unit area” contained in each portion may be simply referred to as “cooling agent basis weight”.

The amount of cooling agent per unit area (M1) contained in the middle part C is the amount of cooling agent per unit area (M2) contained in the front part F, or per unit area contained in the rear part R When the amount is more than the amount (M3) of the cooling agent, the ratio of the two is preferably in the following range.
That is, the ratio (M1 / M2) or (M1 / M3) of the cooling agent basis weight (M1) to the cooling agent basis weight (M2) or (M3) is the persistence of the cooling sensation effect near the excretory part From the viewpoint, 1.0 or more is preferable, 1.10 or more is more preferable, and 1.15 or more is still more preferable. Further, the ratio (M1 / M2) or (M1 / M3) is preferably 2.0 or less, more preferably 1.9 or less, from the viewpoint of making the wearer appropriately feel the coolness near the excretory part And 1.8 or less are more preferable.

As the cooling agent, as described later, those which are insoluble in water or poorly soluble in water are preferable, and menthol and menthol derivatives are more preferable. It is particularly preferable to include menthol and menthyl lactate. When the cooling agent contains menthyl lactate, the amount of the cooling agent described above is evaluated based on the presence / absence and the content of menthyl lactate since menthyl lactate has a high cooling sensation persistence.

(How to measure the amount of cooling agent per unit area)
The cooling agent can be extracted with a solvent from the target member or target site of the absorbent article, and the extraction 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, for example, by 7890A manufactured by Agilent technologies. The relationship between the concentration of the compound constituting the cooling agent and the peak area is previously converted to a calibration curve, and quantitative work is performed based on the calibration curve.
The case where the cooling agent contains menthyl lactate and / or menthol is described as an example. Menthyl lactate and / or menthol is extracted from the target member or target site using methanol as a solvent. Prepare in advance 3 to 5 steps of menthyl lactate solution and / or menthol solution with different concentrations, calculate peak area of each concentration from GC chromatogram, use n-pentyl alcohol as a standard sample, and use standard sample Prepare a calibration curve plotting the peak area against the concentration of By analyzing the extract under the same conditions as the analysis for which the calibration curve was prepared, the peak area obtained is applied to the calibration curve to calculate the amount of menthyl lactate and / or the amount of menthol. The amount of cooling agent per unit area can be determined by dividing the obtained amount of menthyl lactate and / or amount of menthol by the area of the product site collected in advance.
In order to know the amount of cooling agent for each component or part of the product, it is possible to analyze by decomposing the product in a chamber at 5 ° C. and taking out the material part to be measured. In the case of a layered absorption layer such as the absorption layer structure (1) or (2) described later, the absorption layer is decomposed for each layer in a chamber at 5 ° C., and the amount of cooling agent for the layer to be measured is taking measurement. On the other hand, in the case of the absorbent layer structure (3) described later, the outermost surface is sampled as evenly as possible in the range up to a thickness of 1 mm using a tapered knob such as tweezers in the middle part C and its periphery. Measure the amount of cooling agent.

The absorbent layer 3 has, in the middle portion C, a low cooling sensation region 34 in which the amount of cooling agent per unit area contained in the skin side of the absorbent layer 3 is smaller than that in the front portion F and the rear portion R. The low cooling sensation region 34 is a portion covering the entire thickness of the absorbing layer 3 which satisfies the requirement of the amount of cooling agent on the skin side of the absorbing layer 3 as shown in FIGS. 3 (A) and 3 (B). . In other words, the low coolness region 34 is composed of a portion of the skin side of the absorption layer 3 that meets the above-mentioned requirement of the amount of cooling agent, and a thickness portion of the absorption layer 3 present on the non-skin side of the portion. . The low cooling sensation region 34 makes the amount of the cooling agent contained in the skin side 34A smaller than that of the front and back skin sides in the plane direction while containing the cooling agent throughout the thickness of the absorbing layer 3. That is, of the skin side 3A of the entire absorbent layer 3, the amount of cooling agent per unit area contained in the skin side 34A of the low coolness region 34 is the skin side of the front side F and the skin side of the rear side R It is smaller than the amount of cooling agent per unit area contained in RA.

The skin side in the absorbing layer 3 indicates the surface portion of the absorbing layer, and is a portion divided according to the following definitions (1) to (3) according to the structure of the absorbing layer 3. This applies to any of the skin side 3A of the entire absorbent layer 3, the skin side 34A of the low coolness region 34, the skin side FA of the front portion F, and the skin side RA of the rear portion R.
(1) When the absorbent layer 3 is a laminate of a plurality of absorbent sheets, the portion of the absorbent sheet located closest to the skin side is taken as the skin side surface.
(2) In the case where the absorbent layer 3 is formed by covering an absorbent core obtained by stacking liquid absorbent materials such as pulp with a core wrap sheet, the portion of the core wrap sheet located closest to the skin side is taken as the skin side.
(3) When the absorbent layer 3 is the one in which the absorbent core is exposed, a portion up to a thickness of 1 mm from the outermost skin side of the absorbent core is taken as the skin side surface.
Based on this definition, the amount of cooling agent per unit area contained in “skin side” is the content in the following part. That is, in the case of the above (1), it is the amount of the cooling agent contained in the absorbent sheet located closest to the skin. In the case of (2), it is the amount of the cooling agent contained in the core wrap sheet located closest to the skin. In the case of (3), it is the amount of the cooling agent contained in the portion from the surface layer portion closest to the skin to the thickness of 1 mm.
The preferable aspect of the absorption layer 3 is mentioned later.

The low cooling sensation area 34 is located at the middle part C in the longitudinal direction, and is disposed at least in a flat area including the liquid receiving area C1 facing the discharge part of the wearer. In the present embodiment, the low cooling region 34 is disposed only in the liquid receiving region C1. However, the present invention is not limited to this aspect, and the low cooling region 34 may be disposed in the entire intermediate portion C extending to the

widthwise end portions

39, 39 of the absorbing layer 3. Further, the low cooling region 34 is not limited to the case of being disposed over the entire length of the middle portion C in the vertical direction, and may be disposed in a region shorter than this.

When the absorbent layer 3 has the low coolness region 34 in the middle portion C, the coolness effect on the delicate area (the excretory portion) of the wearer is felt relatively weaker than the front portion F and the rear portion R, I can relieve the feeling of stimulation. In particular, since the region with a small amount of cooling agent in the low-cooling region 34 is the skin side 34A, the stimulus to the delicate area is alleviated from the initial stage of wearing the napkin 10. Thereby, a moderate cool sensation can be provided from the stage where the skin in the initial stage of wear is not accustomed to stimulation. In addition, as described above, the amount of cooling agent contained in the entire middle portion C per unit area is equal to or greater than that of the front portion F and the rear portion R, so that a reasonably cool feeling to the delicate area of the wearer is obtained. The effect is easy to last long. That is, by suppressing the amount of cooling agent only on the skin side 34A of the low cooling sensation region 34 without reducing the amount of cooling agent in the middle part C, a moderate feeling of cooling can be achieved while suppressing the stimulation given to the skin at one time. It can be applied to the skin for a long time. Also, if the napkin 10 is worn for a long time, even if the cold feeling given to the delicate area may become stronger on the way, the wearer gets used to the cold feeling by wearing for a long time unlike the initial stage of wearing , The strong stimulation of the cooling agent is easily suppressed. As described above, by suppressing the cold sensation effect at the initial stage of wearing and imparting it for a long time, it is possible to make the wearer feel a good cold feeling for a long time.

Amount of cooling agent per unit area (M5) contained in the skin side FA of the front portion F of the amount of cooling agent per unit area (M4) contained in the skin side 34A of the low cooling sensation region 34, and The ratio (M4 / M5) and M4 / M6 to the amount of cooling agent (M6) per unit area contained in the skin side surface RA of the rear portion R is 0 from the viewpoint of easily imparting a comfortable cooling feeling to the wearer. 4 or more is preferable, 0.5 or more is more preferable, and 0.6 or more is still more preferable. Further, the ratio (M4 / M5) and (M4 / M6) is preferably less than 1.0 from the viewpoint of the wearer being more likely to feel a proper cooling sensation in the excretory part compared to the front part or the rear part, 0.95 or less is more preferable, and 0.9 or less is still more preferable.

In the low cooling sensation region 34, it is preferable that the amount of the cooling agent contained per unit area be relatively larger on the skin side 34A than on the non-skin side 34B. By adjusting the amount of the cooling agent as described above in the low coolness region 34, the wearer can quickly feel a moderate cool feeling when worn, and can impart an immediate effect to how cold feel is felt.

The skin side 34A referred to here is a portion divided by the definition described above. The non-skin side 34B is a portion divided according to the following definitions (1) to (3) according to the structure of the absorbent layer.
In addition, the non-skin side defined below is not only the non-skin side 34B of the low coolness region 34 but also the non-skin side 3B of the whole absorbent layer 3, the non-skin side FB of the front part F, the non-skin of the back part R This applies to any of the side RBs.
(1) When the absorbent layer 3 is a laminate of a plurality of absorbent sheets, the portion of the absorbent sheet located closest to the non-skin side is taken as the non-skin side.
(2) In the case where the absorbent layer 3 is an absorbent core obtained by stacking liquid absorbent materials such as pulp and covered with a core wrap sheet, the portion of the core wrap sheet located closest to the non-skin side is the non-skin side. Do.
(3) When the absorbent layer 3 is the one in which the absorbent core is exposed, a portion up to a thickness of 1 mm from the surface layer portion on the most non-skin side of the absorbent core is taken as the non-skin side.
Based on this definition, the amount of cooling agent per unit area contained in the “non-skin side” is the content in the following part. That is, in the case of the above (1), it is the amount of the cooling agent contained in the absorbent sheet located closest to the non-skin side. In the case of the above (2), it is the amount of the cooling agent contained in the core wrap sheet located closest to the non-skin side. In the case of the above (3), it is the amount of the cooling agent contained in the portion from the surface layer portion on the non-skin side to the thickness 1 mm.

The amount of cooling agent per unit area (M4) contained in the skin side 34A of the low cooling sensation region 34, the amount of cooling agent per unit area (M7) contained in the non-skin side 34B of the low cooling sensation region 34 The ratio (M4 / M7) to (iii) is preferably 1.1 or more, more preferably 1.3 or more, and still more preferably 1.5 or more, from the viewpoint of providing a moderate cooling sensation quickly. Further, the ratio (M4 / M7) is preferably 3.0 or less, more preferably 2.7 or less, and still more preferably 2.5 or less, from the viewpoint of facilitating appropriate transition of the cooling agent to the non-skin side 34B. preferable.

In the non-skin side 3B of the absorption layer 3, it is preferable that the amount of the cooling agent contained per unit area is larger on the front portion F side and the rear portion R side than the low cooling region 34. That is, the non-skin side FB on the front portion F side and the non-skin side RB on the rear portion R side are included in each of the non-skin side 34B of the low coolness region 34 relative to the amount of cooling agent per unit area. Preferably, the amount of cooling agent per unit area is increased. Thus, by providing a difference in the amount of the cooling agent, the cooling agent can easily shift from the front part F and the rear part R to the low cooling region 34 with the passage of time, and the cooling sensation felt from the low cooling region 34 Sustainability of the

The amount of cooling agent per unit area (M8) contained in the non-skin side surface FB of the front part F, and the amount of cooling agent per unit area (M9) contained in the non-skin side surface RB of the rear portion R The ratio (M8 / M7) and (M9 / M7) of the amount of cooling agent per unit area (M7) and (M9 / M7) contained in the non-skin side surface 34B of the low cooling sensation region 34 is the lasting feeling of coldness when worn for a long time From the viewpoint of the properties, 1.5 or more is preferable, 1.75 or more is more preferable, and 2.0 or more is still more preferable. Further, the ratio (M8 / M7) and (M9 / M7) is preferably 3.5 or less, more preferably 3.25 or less, from the viewpoint of giving a proper cooling sensation in the excretory part of the wearer. 0 or less is more preferable.

The relationship between the amount of cooling agent per unit area in the absorption layer 3 described above may be appropriately determined by the application position and amount of the cooling agent, the basis weight of the absorption layer, the density of the absorption layer, the constituent material of the absorption layer, the laminated structure It can be set and defined.

Next, the preferable aspect of the absorption layer 3 is demonstrated with reference to FIG. 4 (A) and (B), FIG. 5 and FIG.

As shown in FIGS. 4 (A) and 4 (B), the absorption layer 3 has a high basis weight portion having a larger absorption basis weight than the absorption basis weight before and after the low cooling sensation region 34 in the low cooling sensation region 34. It is preferable to have 33. The high basis weight portion 33 is bulkier than the surroundings, and the cooling agent can be dispersed in the thickness direction. Thereby, the amount of the cooling agent in the skin side surface 34A in the low cooling sensation region 34 can be appropriately set in a desired range. It is preferable that the application part of the cooling agent containing liquid is distribute | arranged to skin side 3A from a viewpoint of controlling a cooling agent amount in a desired range. The cooling agent-containing liquid is a coating liquid in which a cooling agent and a solvent are mixed, and is a liquid used when being contained in the napkin 10. The application part of the cooling agent containing liquid is a part initially contained in a manufacturing process.
For example, on the skin side 3A of the absorbent layer 3, the cooling agent-containing liquid is applied in the longitudinal direction from the high basis weight portion 33 to the front portion F and the rear portion R. The cooling agent-containing liquid is likely to shift in the thickness direction from the skin side surface 3A of the absorbing layer 3 due to penetration and diffusion of the solvent. In the high basis weight portion 33, due to the difference in basis weight between the front portion F and the rear portion R, more cooling agent-containing liquid moves in the thickness direction than the front portion F and the rear portion R, and The amount of photosensitizer decreases. Thus, the low cooling region 34 is formed in the high basis weight portion 33. As the solvent, various ones commonly used can be adopted. For example, dipropylene glycol and the like can be mentioned.

It is preferable that the high basis weight portion 33 be disposed corresponding to the low cooling region 34. Specifically, it is preferably disposed in the liquid receiving area C1 of the middle portion C, and more preferably disposed in a predetermined range including the liquid receiving area C1. The high basis weight portion 33 can be formed by various methods depending on the aspect of the absorbent layer 3. For example, in the case where the absorbent layer 3 has an absorbent core obtained by stacking liquid absorbent materials such as pulp, the high basis weight portion 33 can be formed by increasing the amount of piled liquid absorbent material over the surroundings. . Moreover, when it is a laminated body of the absorptive sheet mentioned later, the high basis weight part 33 can be formed by increasing the number of sheets of an absorptive sheet rather than circumference | surroundings.

The high basis weight portion 33 is bulkier than the surrounding as described above and is thicker than the surrounding. It is preferable that the thickness part of this high basis weight part 33 is the shape which protruded on the skin side rather than circumference | surroundings. As a result, the high basis weight portion 33 is in the liquid receiving area C1, has high liquid absorbability of the excrement fluid (body fluid), and enhances the prevention of remaining liquid in the surface layer 1 of the napkin 10. Moreover, since the part which has the high basic weight part 33 of the napkin 10 fits a wearer's skin directly, without absorbing the excretion liquid, it also improves the prevention property against a liquid leak. At this time, by providing the low basis weight region 34 in the high basis weight portion 33 fitted to the skin, it is possible to suppress an excessive stimulation on the skin and to continuously provide a moderate cold sensation effect for a long time.

The absorbent layer 3 preferably has a laminated structure of absorbent sheets. In the case where the absorbent layer 3 has a laminated structure of absorbent sheets, it is preferable that the number of laminated layers of the absorbent sheets be larger than that of the high basis weight portion 33 described above.
When the absorbent layer 3 has a laminated structure in the thickness direction of the absorbent sheet, the transition of the cooling agent in the high basis weight portion 33 can be easily controlled. That is, in the high basis weight portion 33, the cooling agent on the side of the skin is dispersed appropriately in the thickness direction while appropriately leaving the cooling agent on the side, and the amount of cooling agent is smaller compared to the skin sides FA and RA of the front part F and rear part R It is possible to form a low cold sensation region 34. In addition, the laminated structure of the high basis weight portion 33 appropriately suppresses the exudation amount of the cooling agent in the interlayer, and prevents the cooling agent content in the non-skin side of the high basis weight portion 33 from becoming excessive. . Thereby, the more preferable low cooling region 34 can be formed. In addition, the volatile component of the cooling agent can be temporarily stored between the layers in the absorption layer 3 to impart a moderate cooling effect to the skin for a longer time.

The absorbent sheet is a thin sheet having a thickness in which a superabsorbent polymer material is sandwiched and fixed between two sheet-like fiber layers made of hydrophilic fibers. In forming the absorbent sheet, the high absorbency polymer can be integrated using the adhesive force which is expressed by wetting, a binder added separately, or a binder such as adhesive fiber. The preparation can be performed by various methods commonly used, and may be either wet or dry. The absorbent sheet has a high absorbing power which hardly causes gel blocking because the highly absorbent polymer material is dispersedly disposed in the plane direction of the sheet while the thickness is suppressed to 3.0 mm or less. For example, those described in paragraphs [0019] to [0131] of JP-A-8-246395 can be mentioned.

When the absorbent layer 3 has a laminated structure of absorbent sheets, it preferably has a laminated structure as shown in FIG.
That is, as shown in FIG. 5, the absorbent layer 3 has a laminated structure including the central absorbent sheet 32 between the skin-side absorbent sheet 31A and the non-skin-side absorbent sheet 31B as a laminated structure of absorbent sheets. Is preferred. It is more preferable that this laminated structure constitutes the high basis weight portion 33, and the laminated structure is in the low cooling region 34.

It is preferable that the skin side absorbent sheet 31A, the non-skin side absorbent sheet 31B, and the central absorbent sheet 32 all contain a cooling agent. The amount of the cooling agent contained per unit area is preferably the largest in the central absorbent sheet 32 among the three types of sheets. By including a large amount of cooling agent in the central absorbent sheet 32, the cooling agent can be brought into contact with the skin while disposing the low cooling sensation region 34 in the high basis weight portion 33 and suppressing excessive stimulation on the skin. It becomes easy to supply to the surface side, and a moderate cool feeling can be sustained longer.

In the embodiment shown in FIG. 5, the skin-side absorbent sheet 31A and the non-skin-side absorbent sheet 31B are arranged on the non-skin side with the portion of the main absorbent sheet 31 folded and arranged on the skin side. Part of the However, skin side absorptive sheet 31A and non-skin side absorptive sheet 31B are not limited to what consists of a continuous absorptive sheet like this mode, and consist of separate independent absorptive sheets. May be

Below, the structure of the absorption layer 3 shown in FIG. 5 is explained in full detail.

The absorbent layer 3 shown in FIG. 5 has a laminated structure in which the main absorbent sheet 31 and the central absorbent sheet 32 are folded.
The main absorbent sheet 31 has a folding structure in which both end portions in the width direction are overlapped on the back surface layer 2 side and folded in three. The main absorbent sheet 31 has a length ranging from the middle part C to the front part F and the rear part R, and has an 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. The central absorbent sheet 32 is narrower than the folded main absorbent sheet 31 in the folded state, and the length in the longitudinal direction is shorter than the main absorbent sheet 31, and the width direction center of the middle portion C Are arranged. The central absorbent sheet 32 is housed inside the folded structure of the main absorbent sheet 31.

In the above-described laminated structure, the portion on the skin side of the central absorbent sheet 32 of the main absorbent sheet 31 is the skin-side absorbent sheet 31A. In addition, the portion on the non-skin side of the central absorbent sheet 32 of the main absorbent sheet 31 becomes the non-skin-side absorbent sheet 31B. The non-skin side absorbent sheet 31 B includes an overlap of the folding end of the main absorbent sheet 31. The skin side absorbent sheet 31A and the non-skin side absorbent sheet 31B are the skin side 3A and the non-skin side 3B of the absorbent layer 3 described above. Assuming that the laminated portion of the main absorbent sheet 31 and the central absorbent sheet 32 is the low coolness area 34, the skin side absorbent sheet 31A and the non-skin side absorbent sheet 31B in this laminated part are of the low coldness area 34. It becomes skin side 34A and non-skin side 34B.

The absorbent layer 3 has the central absorbent sheet 32 in the above-described laminated structure, and is provided with a high basis weight portion 33 thicker than the periphery at the center in the width direction of the middle portion C. At the position of the high basis weight portion 33, the napkin 10 is preferable because it is easy to fit the skin surface of the wearer and the wearer can easily feel cold. Moreover, the absorption layer 3 can suppress the exudation amount of the cooling agent to the thickness direction in an interlayer by the laminated structure of the sheet | seat in the high basic weight part 33. As shown in FIG. Thereby, the volatilized component of the cooling agent can be stored at a position relatively close to the skin of the absorbent layer 3 in the region of the middle portion C and sent to the skin. At this time, since the portion of the laminated structure is the low coolness region 34, it is possible to keep giving a moderate cool feeling effect to the skin for a long time while suppressing the direct excessive stimulation on the skin.

In the absorption layer 3, the ratio (H2 / H1) of the thickness (H2) of the portion other than the high basis weight portion 33 to the thickness (H1) of the high basis weight portion 33 is from the viewpoint of being able to be used without discomfort to the skin surface 1/5 or more is preferable and 1/3 or more is more preferable. The ratio (H2 / H1) is preferably 4/5 or less, more preferably 2/3 or less, from the viewpoint of fit.
The ratio (N2 / N1) of the basis weight (N2) of the part other than the high basis weight part 33 to the basis weight (N1) of the high basis weight part 33 in the absorbent layer 3 is the liquid diffusion prevention at the time of waste fluid absorption From the viewpoint of the above, 1⁄4 or more is preferable, and 1⁄3 or more is more preferable. The ratio (N2 / N1) is preferably 7/8 or less, more preferably 2/3 or less, from the viewpoint of preventing deflection due to the difference in rigidity between the high basis weight part and the low basis weight part.

The folded structure of the central absorbent sheet 32 is not limited to the embodiment shown in FIG. For example, it may be folded as shown in FIGS. 6 (A) to 6 (D). FIG. 6A shows an aspect in which both ends in the width direction of the central absorbent sheet 32 are folded back in the S-shape, on the skin contact surface side and the non-skin contact surface side, respectively. FIG. 6B shows an aspect in which the sheet is folded in half in the width direction. 6 (C) and 6 (D) show a mode in which the portions folded in three in the width direction are equal in length.

The folding structure of the main absorbent sheet 31 is not limited to the mode shown in FIG. For example, it may be similar to those shown in FIGS. 6 (A) to 6 (D) shown as the folded structure of the central absorbent sheet 32. Moreover, the structure which laminated | stacked the 2 sheet | seat divided into the skin contact surface side and the non-skin contact surface side may be sufficient. Furthermore, it is not limited to the mode which includes central absorptive sheet 32 inside the folding structure of main absorptive sheet 31, but does not include, but central absorption on the non-skin contact side of the folding structure of main absorptive sheet 31 It may be a mode in which the sexing sheet 32 is laminated.
However, it is preferable that the central absorbent sheet 32 be included in the folded structure of the main absorbent sheet 31 because the volatile component of the cooling agent is easily accumulated.

It is preferable that the overlapping portions of the absorbent sheets are not joined regardless of the laminated structure of the absorbent layer 3. Thereby, the space between the layers of the absorption layer 3 is easily formed, and the opening and closing property between the above layers is enhanced. As a result, delivery of the volatile component of the cooling agent to the skin can be more easily expressed.

In the present embodiment, from the viewpoint of suppressing the stimulation to the sensitive part of the skin, the side sheet 5 mentioned above straddles both widthwise end edges 39 of the absorption layer 3 from the width direction outer side of the absorption layer 3, It is preferable to extend it. Further, it is preferable that the inner end of the side sheet 5 is at least the widthwise outer side than the low cooling region 34 in the middle portion C. Thereby, the side sheet 5 can suppress that the volatile component of a cooling agent stimulates the vicinity of a wearer's buttocks directly. At this time, it is preferable that the side sheet 5 has lower air permeability than the surface layer 1 from the viewpoint of enhancing the suppression effect on skin irritation. The air permeability can be appropriately set by the method used for this type of article. For example, when the side sheet 5 is made of non-woven fabric, air permeability can be suppressed by narrowing the inter-fiber distance or selecting an oil agent to be used. It is preferable that the air permeability of the side sheet 5 is lower than the air permeability of the surface layer 1 when the air permeability is measured in accordance with JIS L1913 "6.8.2 Gurley type". When the side sheet 5 is too small to be measured in the Gurley format, the side sheet 5 is attached to a non-air-permeable film material (preferably KOKUYO OHP film etc.) having an opening smaller than that size. The measurement is performed, and the opening area value is converted to the area (642 mm ² ) specified in the Gurley format.

In addition, it is preferable that the intermediate fiber layer 4 described above is in a region overlapping the low-cooling sensation region 34 in plan view between the surface layer 1 and the absorbent layer 3. Thereby, on the non-skin contact surface side of the surface layer 1, the space between the layers for accumulating the volatilized component of the cooling agent is increased. In addition, the presence of the intermediate fiber layer 4 makes it possible to prolong the cool feeling just right. In this case, the cooling agent may or may not be contained in the intermediate fiber layer 4. It is preferable that the amount of the cooling agent on the skin side surface 34A of the low cooling sensation region 34 be larger than that of the intermediate fiber layer 4 from the viewpoint of maintaining the moderate cooling sensation effect effectively for a long time.

The intermediate fiber layer 4 is preferably joined to the surface layer 1 by a plurality of longitudinally extending adhesives intermittently arranged in the width direction. Similarly, the intermediate fiber layer 4 is preferably joined to the absorbent layer 3 by a plurality of longitudinally extending adhesives intermittently arranged in the width direction. Intermittent placement of the adhesive in the width direction can be achieved by various methods used for this type of article. For example, intermittent coating of a hot-melt adhesive or the like in a linear, spiral, Ω shape, summit shape or the like can be mentioned. At this time, coating can be performed using various means such as a slot coat gun, a spiral spray gun, a spray gun, and a dot gun.
Thereby, the adhesive can suppress the cooling agent from diffusing outward in the width direction, and the cooling effect can be maintained at a desired location.
Moreover, the ratio of the application area of the adhesive to the area of the skin side of the absorbent layer 3 is preferably 20% or less, more preferably 15%, from the viewpoint of securing the liquid absorbability (liquid permeability). Or less, more preferably 10% or less. The term "coated area of adhesive" as used herein refers to the area between the coated portions when the adhesive is intermittently coated in a linear, spiral, Ω shape, summit shape, etc. It is the area except an uncoated part. In addition, the ratio of the coating width of the adhesive to the absorption layer width in the middle portion C is preferably 45% or more, and more preferably, from the viewpoint of suppressing the diffusion of the cooling agent outward in the width direction. Is 60% or more, more preferably 75% or more. In addition, "the coating width of an adhesive agent" said here is the sum total of the width | variety of the adhesive agent in each coated part, when the adhesive agent is intermittently distribute | arranged to the width direction.

Further, the intermediate fiber layer 4 is preferably a non-woven fabric containing thermoplastic fibers. When the intermediate fiber layer 4 is such non-woven fabric, the liquid diffusibility becomes high. Thereby, when the cooling agent is contained in the intermediate fiber layer 4, the cooling agent exudes excessively in the thickness direction to the non-skin side regardless of whether it is included in the skin side of the absorbent layer 3. The cold sensation effect is likely to be maintained longer.
The intermediate fiber layer 4 preferably has a higher fiber density than the surface layer 1. Thereby, the migration of the cooling agent to the surface layer 1 is suppressed by the density gradient. As a result, it is possible to maintain a cold feeling for a longer time while suppressing excessive stimulation on the skin.

The ratio of the length W1 in the width direction of the intermediate fiber layer 4 to the length W2 in the width direction of the absorbent layer 3 is preferably 60% or more, more preferably 65% or more, from the viewpoint of effectively diffusing waste fluid. 70% or more is more preferable. Further, from the viewpoint of preventing leakage of the excretory fluid, the ratio is preferably 90% or less, more preferably 85% or less, and still more preferably 80% or less.

What is used for the article of this kind can be used without particular limitation as a forming material of the member constituting the napkin 10.

As a cooling agent, it can stimulate the wearer's skin and / or mucous membrane surface thermoreceptor to convey a feeling of exhilaration to the wearer without changing the temperature on the skin and / or mucous membrane surface Various agents can be used. Examples thereof include cyclohexyl derivatives, cyclohexanol derivatives, carboxamides and the like, as described in paragraphs [0006] to [0086] of JP-A-2015-12918.
Among them, water-insoluble or poorly water-soluble ones are preferable from the viewpoint of refreshing feeling and quick action and persistence due to odor. Since the water-insoluble or poorly water-soluble cooling agent hardly migrates to the non-skin contact surface side with the body fluid, the cold feeling tends to be sustained. Menthyl lactate and menthol are preferable as water insoluble or poorly water soluble ones. The term "water-insoluble or poorly water-soluble" as used herein means that the solubility is 1 g or less in 1 L of water at 25 ° C, and particularly "water-insoluble" is 0.1 g or less in 1 L of water at 25 ° C Say that it is soluble in water.
A cooling agent can be contained in the napkin 10 by various methods. For example, they may be contained in the napkin 10 in a state of being dissolved in a solvent, or may be contained without using a solvent. In addition, the cooling agent may be contained in the napkin 10 together with a delivery means such as encapsulation in microcapsules. As the solvent, various ones commonly used can be adopted. For example, dipropylene glycol and the like can be mentioned.

As a cooling agent, in particular, it is preferable to include menthol and menthyl lactate because the cooling effect can be felt quickly and gently after wearing, and the durability can be enhanced. From the same viewpoint, the content ratio of menthol and menthyl lactate is preferably 0.01 or more, more preferably 0.02 or more, and preferably 0.2 or less, in the mass ratio of the former / the latter. Is more preferred.

As the absorbent layer 3, various forms which are usually used as an absorbent article can be adopted without particular limitation as long as the low-cool sensation region 34 described above can be disposed. For example, a stack of hydrophilic fibers or a mixed stack of hydrophilic fibers and a superabsorbent polymer material may be covered with a hydrophilic covering sheet. In addition, 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.

As a hydrophilic fiber which comprises the absorption layer 3, what carried out the hydrophilization treatment of the hydrophobic fiber, and the thing which itself is hydrophilic are mentioned. In particular, those which themselves are hydrophilic and have water retention are preferred. As the latter hydrophilic fibers, natural fibers, regenerated cellulose fibers or semi-synthetic fibers are mentioned as preferable examples. As the hydrophilic fiber, in particular, pulp and rayon are preferable, and pulp is more preferable. Further, crosslinked cellulose fibers obtained by crosslinking the intramolecular and / or intermolecular of cellulose fibers or bulky cellulose fibers obtained by mercerizing wood pulp may be used. Examples of the pulp include wood pulp such as softwood kraft pulp and hardwood kraft pulp, and natural cellulose fibers such as cotton pulp and straw pulp, but not limited thereto. These pulps can be used alone or in combination of two or more.

The superabsorbent polymer material constituting the absorbent layer 3 can be obtained, for example, by polymerizing a water-soluble ethylenic unsaturated monomer mainly composed of acrylic acid or acrylic acid salt and optionally containing a crosslinking agent. Hydrogel materials are included. Also, polyethylene oxide, polyvinyl pyrrolidone, crosslinked products of sulfonated polystyrene and polyvinyl pyridine, saponified starch-poly (meth) acrylonitrile graft copolymer, starch-poly (meth) acrylic acid graft copolymer, starch-poly ( The hydrolyzate of a (meth) acrylic ester graft copolymer etc. are mentioned. These superabsorbent polymer materials can be used alone or in combination of two or more. As the superabsorbent polymer material, a material capable of absorbing and retaining pure water of 20 times or more, particularly 50 times or more of its own weight and capable of gelation is preferable.
As the shape of the superabsorbent polymer material, various materials used for the absorbent layer 3 can be used without particular limitation. For example, spherical shape, granular shape, fibrous shape, bowl shape, lump shape etc. are mentioned.

The surface layer 1 can use various sheets having liquid permeability. In consideration of the goodness of the touch, a hydrophilic non-woven fabric is preferable, a thermal bond non-woven fabric is more preferable, and an air-through non-woven fabric is particularly preferable. The fiber constituting the nonwoven fabric of the surface layer 1 is preferably a thermoplastic resin fiber subjected to hydrophilization treatment, and the fiber is preferably a fiber subjected to a three-dimensional crimp such as a secondary crimp or a tertiary crimp. . Specifically, the fibers constituting the non-woven fabric of the surface layer 1 are polyethylene, polypropylene, polyester, nylon, and composite fibers thereof, and these composite fibers are cut at a predetermined length before forming staples, It is hydrophilized by applying various hydrophilizing agents. As the hydrophilizing agent, various alkyl sulfonates represented by α-olefin sulfonate, acrylate, acrylate / acrylamide copolymer, ester amide, ester amide salt, polyethylene glycol and derivatives thereof, water-soluble Hydrophilization treatment with a commonly used hydrophilizing agent can be used, such as polyester resin, various silicone derivatives, various saccharide derivatives, and mixtures thereof.

As the back surface layer 2, various materials having leak resistance can be used. For example, a non-moisture permeable or moisture-permeable film alone, or a combination 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 moisture-permeable film alone as the leak-proof material, in view of cost and matching with the anti-slip adhesive. In this case, the moisture-permeable film material may be a thermoplastic resin and a film obtained by melt-kneading and extruding a non-compatible inorganic filler, and stretched to a predetermined size to form a micro-porous film, or essentially There is a non-porous film which is highly compatible with water and which can discharge water vapor like a permeable membrane.

The intermediate fiber layer 4 is preferably one having hydrophilicity and excellent in liquid diffusibility. Non-woven fabrics containing thermoplastic fibers can be mentioned. As the non-woven fabric, non-woven fabrics obtained by various manufacturing methods can be used. For example, an air through non-woven fabric in which heat fusion points of fibers are formed by air through method on a fiber web obtained by card method or air laid method, heat fusion points of fibers are formed by heat roll method on a fiber web obtained by card method Various non-woven fabrics such as heat-roll non-woven fabric, heat-embossed non-woven fabric, spunlace non-woven fabric, needle punched non-woven fabric, resin-bonded non-woven fabric, etc. can be used.

The side sheet 5 is preferably a water repellent non-woven fabric, and non-woven fabric manufactured by the card method, spun bonded non-woven fabric, meltblown non-woven fabric, spun lace non-woven fabric, heat roll non-woven fabric, needle punched non-woven fabric, etc. Various non-woven fabrics treated with water can be used. Particularly preferably, for example, a spunbond nonwoven fabric, a spunbond-meltblown (SM) nonwoven fabric, a spunbond-meltblown-spunbond (SMS) nonwoven fabric and the like are used.

The absorbent article of the present invention is not limited to the sanitary napkin of the above embodiment, and can be applied to, for example, panty liners, incontinence pads, urine collecting pads, disposable diapers and the like. Moreover, it is effective not only to menstrual blood but also to other things such as urine, orimono, soft stools and the like. In addition to the components described above, members may be incorporated appropriately in accordance with the application and function.

When the absorbent article of the present invention is a product such as a sanitary napkin or a panty liner which is carried in a bag for each product, it is preferable to be individually packaged. Specifically, it is preferable that the absorbent article packaging body is longitudinally folded so that the surface layer is inside, and is wrapped by the outer wrapping material for individual wrapping. By using the individual package, it is possible to make the article highly portable while protecting the hygiene of the surface layer (use side) that touches the skin, and it is possible to enhance the convenience of the user.

Regarding the above-mentioned embodiment, the present invention further discloses the following absorbent article.

<1>
An absorbent article having a longitudinal direction and a width direction orthogonal to the longitudinal direction, and including an absorbent layer, wherein the middle portion includes a liquid receiving area facing the wearer's excretory part along the longitudinal direction; The absorption layer includes a cooling agent from the front portion to the rear portion, and the cooling layer has a cooling agent content per unit area contained in the absorption layer. The amount of photosensitizer in the middle part is the same as the front part and the rear part or more than in the front part and the rear part, and in the middle part, per unit area contained in the skin side of the absorbent layer An absorbent article having a cold feeling area in which the amount of cooling agent is less than the front part and the rear part.

<2>
The absorbent article according to <1>, wherein the amount of cooling agent contained per unit area in the low coolness region is larger on the skin side than on the non-skin side.
<3>
The amount of cooling agent per unit area (M4) contained in the skin side of the low coolness region, the amount of cooling agent per unit area (M5) contained in the skin side of the front portion, and The ratio (M4 / M5) and (M4 / M6) to the amount of cooling agent per unit area (M6) contained in the skin side is 0.4 or more, preferably 0.5 or more, more preferably 0.6 The absorbent article according to <1> or <2>, which is as described above, and is less than 1.0, preferably less than or equal to 0.95, and more preferably less than or equal to 0.9.
<4>
The absorbent article according to any one of <1> to <3>, having a high basis weight portion in which the absorption layer basis weight is larger than the absorption layer basis weight before and after it in the low coolness region.
<5>
The ratio (H2 / H1) of the thickness (H2) of the part other than the high basis weight part to the thickness (H1) of the high basis weight part is 1/5 or more, preferably 1/3 or more, The absorbent article as described in said <4> which is 4/5 or less, preferably 2/3 or less.
<6>
In the absorption layer, the ratio (N2 / N1) of the basis weight (N2) of the part other than the high basis weight part to the basis weight (N1) of the high basis weight part is 1/4 or more, preferably 1/3 or more The absorbent article as described in said <4> or <5> which is 7/8 or less, preferably 2/3 or less.
<7>
The absorbent according to any one of <4> to <6>, wherein the absorbent layer has a laminated structure of absorbent sheets, and the high basis weight portion has a larger number of laminated absorbent sheets than before and after that. Sex goods.
<8>
As a laminated structure of the absorbent sheet, it has a laminated structure including a central absorbent sheet between the skin side absorbent sheet and the non-skin side absorbent sheet in the low coolness area, and the low coolness area In the laminated structure, the absorbent article according to <7>, wherein the amount of cooling agent contained per unit area is the largest in the central absorbent sheet.
<9>
In the non-skin side of the absorbent layer, the amount of cooling agent contained per unit area is larger on the front side and the rear side than the low cold region, the <1> to <8>. The absorbent article according to any one of the above.
<10>
In the absorption layer, the amount of cooling agent per unit area (M8) contained in the non-skin side of the front portion, and the amount of cooling agent per unit area (M9) contained in the non-skin side of the rear portion The ratio (M8 / M7) and (M9 / M7) of the amount of cooling agent per unit area (M7) contained in the non-skin side of the low cold feeling area is 1.5 or more, preferably 1. The absorbent article as described in said <9> which is 75 or more, more preferably 2.0 or more, and 3.5 or less, preferably 3.25 or less, more preferably 3.0 or less.
<11>
The absorbent article according to any one of <1> to <10>, wherein the cooling agent is water insoluble or poorly water soluble.
<12>
The absorbent article as described in said <11> which contains a menthyl lactate as said cooling agent.
<13>
The absorbent article as described in said <12> which contains menthol as said cooling agent.
<14>
The absorbent article according to <13>, wherein the mass ratio of the menthol to the menthyl lactate as the former / latter is 0.01 or more and 0.2 or less, preferably 0.02 or more and 0.15 or less .
<15>
In the absorption layer, the amount of cooling agent per unit area (M1) contained in the middle part, the amount of cooling agent per unit area (M2) contained in the front part or a unit contained in the rear part The ratio (M1 / M2) or (M1 / M3) to the amount of cooling agent (M3) per area is 1.0 or more, preferably 1.10 or more, more preferably 1.15 or more, and 2 The absorbent article according to any one of the above <1> to <14>, which is not more than 0, preferably not more than 1.9, more preferably not more than 1.8.
<16>
The amount of cooling agent per unit area (M4) contained in the skin side surface of the low cooling sensation region relative to the amount of cooling agent per unit area (M7) contained in the non-skin side surface of the low cooling sensation region The ratio (M4 / M7) is 1.1 or more, preferably 1.3 or more, more preferably 1.5 or more, and 3.0 or less, preferably 2.7 or less, more preferably 2.5 The absorbent article according to any one of the above <1> to <15>, which is the following.
<17>
The surface layer is provided on the skin contact surface side of the absorption layer, and an intermediate fiber layer is provided between the surface layer and the absorption layer in a region overlapping with the low-cooling sensation region in plan view. The absorbent article as described in any one of 16>.
<18>
The intermediate fiber layer and the absorbent layer are bonded with an adhesive, and the ratio of the coated area of the adhesive to the area of the skin side of the absorbent layer is 20% or less, preferably 15% or less. The absorbent article according to <17>, more preferably 10% or less.
<19>
The intermediate fiber layer and the absorbent layer are bonded with an adhesive, and the ratio of the coating width of the adhesive to the absorbent layer width in the middle part is 45% or more, preferably 60% or more, more preferably 75 The absorbent article as described in said <17> or <18> which is% or more.
<20>
The absorbent article according to any one of <17> to <19>, wherein a side sheet having air permeability smaller than that of the surface layer is laminated on both sides of the skin contact surface side of the surface layer.
<21>
The absorbent article according to any one of <1> to <20>, further comprising a wing portion extended outward in the width direction of the absorbent layer.
<22>
The absorbent article according to any one of the above <1> to <21>, which is a sanitary napkin.

EXAMPLES The present invention will be described in more detail based on examples given below, but the invention is not meant to be limited by these.

In the sanitary napkin having the structure shown in FIG. 5, the main absorbent sheet is made to have a length of 180 mm in the longitudinal direction and 75 mm in the width direction, and a central absorbent sheet having a length of 90 mm in the longitudinal direction and width The direction length was made to be 35 mm. A cooling agent was applied so as to be 5.2 mg menthol and 52 mg menthyl lactate over the entire length (180 mm) of the main absorbent sheet of the absorbent layer on the skin contact side, and was delivered into an airtight container. And left at room temperature (23 ° C.) for 3 weeks. The total amount of the cooling agent per unit area (the amount of cooling agent in the entire thickness of the absorbing layer, M1 to M20) per unit area in the front, middle and rear portions in the width direction length range of the central absorbent sheet M3) and the amount of cooling agent (M4 to M6) per unit area of the main absorbent sheet and the central absorbent sheet positioned on the skin side were measured.
In addition, about an absorption layer, it was created according to Example 2 of the patent 2963647 as a main body absorptive sheet and a center absorptive sheet. However, High Bulk Additive HBA manufactured by Weyerhauser Paper was used as the cross-linked treated pulp, and Aquaric CA manufactured by Nippon Shokubai Co., Ltd. was used as the superabsorbent polymer.

The amount of menthyl lactate (M4 to M6) per unit area in the width direction length range in which the central absorbent sheet is present, as measured in the sanitary napkin of the example, was as follows. In the main body absorbent sheet on the skin side (skin side absorbent sheet, on the skin side of the absorbent layer), 3.5 g / m ² (M5, M6) in the front and back parts, 2.9 g / m in the middle part It was ² (M4). Moreover, it was 4.0 g / m < ² > in the central absorbent sheet located in the middle part.
On the other hand, the total amount of menthyl lactate (M1 to M3) per unit area over the entire thickness of the absorbent layer in the width direction length range in which the central absorbent sheet is present was as follows. It was 6.8 g / m ² (M2, M3) in the front and rear parts and 8.2 g / m ² (M1) in the middle part.

In this embodiment, a uniform amount of cooling agent is applied over the entire length of the absorbent layer, but the presence of the central absorbent sheet allows the cooling agent to be added to the central absorbent sheet from the front and rear portions. In the entire thickness of the absorbing layer, it is presumed that the amount of cooling agent in the middle portion is larger than the amount of cooling agent in the front and rear portions. At the same time, the cooling agent applied on the skin-contacting surface side of the absorbent layer penetrates and diffuses in the thickness direction, and the sensation of coolness per unit area on the skin-contacting surface side of the front and rear portions in the middle part It is inferred that the amount of the drug decreased. Therefore, in the method of manufacturing the sanitary napkin of this embodiment, even if a uniform amount of cooling agent is applied over the entire length of the absorbent layer, the configuration of the present invention can be realized, which is easy to manufacture. It can be said that it is also excellent.
Of course, instead of this, a step of applying a larger amount of cooling agent to the front and rear portions than the middle portion on the skin-contacting surface side of the absorbent layer, and a cooling sensation on the non-skin-contacting surface side of the absorbent layer By separately performing the step of applying the coating agent, the amount of cooling agent in the middle portion is made equal to or more than the amount of cooling agent in the front and back portions, and the unit of the middle portion on the skin contact surface side of the absorbent layer It is also possible to distribute less of the amount of cooling agent per area than in the front and back portions.

While the present invention has been described in conjunction with its embodiments and examples, it is not intended to limit our invention in any detail of the description unless otherwise specified, and the spirit of the invention as set forth in the appended claims. We believe that it should be interpreted broadly without violating the scope.

Reference Signs List 1 surface layer 2 back layer 3 absorbent layer 31 main body absorbent sheet 31A skin side absorbent sheet 31B non-skin side absorbent sheet 32 central absorbent sheet 33 high basis weight portion 34 low coolness area 34A skin cold side area 34B Non-skin side of low cold region 4 Intermediate fiber layer 5 Side sheet 6 Wing portion 10 Sanitary napkin

Claims

An absorbent article having a longitudinal direction and a width direction perpendicular to the longitudinal direction and comprising an absorbent layer,
It has an intermediate part including a liquid receiving area opposed to the wearer's excrement part along the longitudinal direction, and a front part and a rear part located on both end sides thereof,
The absorption layer contains a cooling agent from the front portion to the rear portion,
The amount of cooling agent per unit area contained in the absorbent layer is equal to or greater than the front portion and the rear portion in the middle portion, than in the front portion and the rear portion,
The absorbent article which has a low coolness area | region in which the quantity of the cooling agent per unit area contained in the skin side of the said absorption layer is smaller than the said front part and the said back part in the said intermediate part.
The absorbent article according to claim 1, wherein the amount of cooling agent contained per unit area in the low coolness region is larger on the skin side than on the non-skin side.
The amount of cooling agent per unit area (M4) contained in the skin side of the low coolness region, the amount of cooling agent per unit area (M5) contained in the skin side of the front portion, and The ratio (M4 / M5) and (M4 / M6) to the amount of cooling agent per unit area (M6) contained in the skin side is 0.4 or more and less than 1.0. The absorbent article as described.
The absorbent article according to any one of claims 1 to 3, wherein a high basis weight portion having an absorption layer basis weight larger than an absorption layer basis weight before and after the low coolness region is included in the low coolness region.
The ratio (H2 / H1) of the thickness (H2) of the part other than the high basis weight part to the thickness (H1) of the high basis weight part is 1/5 or more and 4/5 or less. The absorbent article as described.
In the absorption layer, the ratio (N2 / N1) of the basis weight (N2) of the part other than the high basis weight part to the basis weight (N1) of the high basis weight part is 1/4 or more and 7/8 or less The absorbent article according to claim 4 or 5.
The absorbent article according to any one of claims 4 to 6, wherein the absorbent layer has a laminated structure of absorbent sheets, and in the high basis weight part, the number of laminated absorbent sheets is larger than before and after that. .
As a laminated structure of the absorbent sheet, it has a laminated structure including a central absorbent sheet between the skin side absorbent sheet and the non-skin side absorbent sheet in the low coolness area, and the low coolness area The absorbent article according to claim 7, wherein in the laminated structure, the amount of cooling agent contained per unit area is the largest in the central absorbent sheet.
The amount of cooling agent per unit area contained in the non-skin side of the absorption layer is larger on the front side and the rear side than the low-cooling area. The absorbent article according to item 1.
In the absorption layer, the amount of cooling agent per unit area (M8) contained in the non-skin side of the front portion, and the amount of cooling agent per unit area (M9) contained in the non-skin side of the rear portion The ratio (M8 / M7) and (M9 / M7) of the amount of cooling agent per unit area (M7) and (M9 / M7) contained in the non-skin side of the low coolness region is 1.5 or more and 3.5 or less The absorbent article according to claim 9, which is
The absorbent article according to any one of claims 1 to 10, wherein the cooling agent is water insoluble or poorly water soluble.
The absorbent article according to claim 11, comprising menthyl lactate as the cooling agent.
The absorbent article according to claim 12, comprising menthol as the cooling agent.
The absorbent article according to claim 13 whose mass ratio of said menthol and said menthyl lactate is 0.01 or more and 0.2 or less as the former / the latter.
In the absorption layer, the amount of cooling agent per unit area (M1) contained in the middle part, the amount of cooling agent per unit area (M2) contained in the front part or a unit contained in the rear part The ratio (M1 / M2) or (M1 / M3) to the amount of cooling agent per area (M3) is 1.0 or more and 2.0 or less according to any one of claims 1 to 14. Absorbent article.
The amount of cooling agent per unit area (M4) contained in the skin side surface of the low cooling sensation region relative to the amount of cooling agent per unit area (M7) contained in the non-skin side surface of the low cooling sensation region The absorbent article according to any one of claims 1 to 15, wherein the ratio (M4 / M7) is 1.1 or more and 3.0 or less.
The surface layer is provided on the skin contact surface side of the absorption layer, and an intermediate fiber layer is provided between the surface layer and the absorption layer in a region overlapping with the low-cooling sensation region in plan view. The absorbent article according to any one of the items.
The intermediate fiber layer and the absorbent layer are bonded with an adhesive, and the ratio of the coated area of the adhesive to the area of the skin side of the absorbent layer is 20% or less. Absorbent article.
The intermediate fiber layer and the absorbent layer are bonded with an adhesive, and the ratio of the coating width of the adhesive to the absorbent layer width in the intermediate portion is 45% or more. Absorbent article.
The absorbent article according to any one of claims 17 to 19, wherein side sheets having air permeability smaller than that of the surface layer are laminated on both sides of the skin contact surface side of the surface layer.
The absorbent article according to any one of claims 1 to 20, comprising a wing portion extended outward in the width direction of the absorbent layer.
The absorbent article according to any one of claims 1 to 21, which is a sanitary napkin.