TWI717361B - Absorbent articles - Google Patents

Abstract

The present invention aims to provide an absorbent article that imparts a moderate cooling effect early and for a long time. The absorbent article of the present invention has the following structure.

The absorbent article (1) is an absorbent article (1) comprising: a skin contact sheet (17), a clothing contact sheet (21), and microcapsules (55) containing cold components, and is characterized by : The skin contact sheet (17) contains fabric containing fibers, and the fiber density of the above-mentioned fibers on the skin contact surface (15) side of the skin contact sheet (17) is higher than that of the non-skin contact surface of the skin contact sheet (17) The fiber density of the above-mentioned fibers on the (57) side is higher, and the skin contact sheet (17) contains microcapsules (55) inside, and the skin contact sheet (17) has microcapsules (55) on the skin contact surface (15) side. The number density of the capsules (55) is lower than the number density of the microcapsules (55) on the non-skin contact surface (57) side of the skin contact sheet (17).

Description

Absorbent articles

The present invention relates to absorbent articles.

Absorbent articles, such as sanitary napkins, sanitary pads, etc., have been developed through years of accumulated technology to improve their basic performance, and compared with the past, after absorbing menstrual blood and other excrement, there is less leakage. Nowadays, higher functions have been developed, such as absorbent articles with aroma function and cooling function.

Patent Document 1 describes an absorbent article for the purpose of preventing excessive irritation to the wearer and surely suppressing discomfort caused by stuffiness, stickiness, etc. The absorbent article of Patent Document 1 is provided with: a surface sheet having a contact surface for contacting the wearer's skin, a liquid impermeable back sheet that does not penetrate liquid, and the surface sheet and the The absorber between the backsheets is provided with a material containing a cooling agent between the surface sheet and the backsheet, and the material containing the cooling agent is arranged on both sides in the width direction of the absorber.

[Advanced Technical Literature] [Patent Literature]

[Patent Document 1] JP 2010-234027 A

In the absorbent article described in Patent Document 1, the refreshing agent is arranged between the surface sheet and the inner sheet. Because the surface sheet exists between the refreshing agent and the wearer, there is a gap between the cooling agent and the wearer. The distance is far, which can suppress excessive stimulation to the user, but there is a tendency for the user to actually feel the effect of the cooling agent for a longer time.

Therefore, the purpose of the present invention is to provide an absorbent article that imparts a moderate cooling effect early and for a long time.

The present inventors have found an absorbent article comprising: a skin contact sheet, a clothing contact sheet, and microcapsules containing cold components, characterized in that the skin contact sheet contains fibers The fiber density of the fibers on the skin abutting surface side of the skin abutting sheet is higher than the fiber density of the fibers on the non-skin abutting surface side of the skin abutting sheet, and the skin abutting sheet The sheet contains the microcapsules inside, and the number density of the microcapsules on the skin contact surface side of the skin contact sheet is higher than the number of microcapsules on the non-skin contact surface side of the skin contact sheet The density is lower.

The absorbent article of the present invention imparts a moderate cooling effect early and for a long time.

1‧‧‧Absorbent articles

3‧‧‧Absorbent article body

5‧‧‧Wings

7‧‧‧Hip Wing

9‧‧‧Liquid permeable sheet

11‧‧‧Liquid impermeable sheet

13‧‧‧Absorber

15‧‧‧Skin contact surface

17‧‧‧Skin contact sheet

19‧‧‧Auxiliary sheet

21‧‧‧Clothing contact sheet

22‧‧‧Clothing contact surface

23, 25, 27‧‧‧Adhesive part

29, 31, 33‧‧‧Press section

35‧‧‧Opening

37、39‧‧‧Sealing part

41‧‧‧Folding part

43、45‧‧‧Spine

47、49‧‧‧Gob

51,53‧‧‧Microcapsule existence area

55‧‧‧Microcapsule

57‧‧‧Non-skin contact surface

59、63‧‧‧Next

61‧‧‧Skin touches the side of the sheet

65‧‧‧Central surface

Fig. 1 is a front view of an absorbent article 1 according to the first embodiment.

Fig. 2 is a rear view of the absorbent article 1 shown in Fig. 1.

Fig. 3 is an end view of the III-III end face of Fig. 1.

Fig. 4 is an enlarged view of area IV in Fig. 3.

Fig. 5 is a diagram for explaining an example of a method of manufacturing the absorbent article 1 of the present invention.

Fig. 6 is a diagram for explaining an example of a method of manufacturing the absorbent article 1 of the present invention.

Fig. 7 is a diagram for explaining an example of the method of manufacturing the absorbent article 1 of the present invention.

[Forms for implementing invention]

The present invention relates to the following aspects.

[Pattern 1]

An absorbent article comprising: a skin contact sheet, a clothing contact sheet, and microcapsules containing cold sensation components, characterized by: The skin contact sheet includes a fabric containing fibers, and the fiber density of the fiber on the skin contact surface side of the skin contact sheet is higher than the fiber density of the fiber on the non-skin contact surface side of the skin contact sheet High, and, The skin contact sheet contains the microcapsules inside, and the number density of the microcapsules on the skin contact surface side of the skin contact sheet is higher than that of the skin contact sheet on the non-skin contact surface side The number density of microcapsules is lower.

In the absorbent article described in aspect 1, the fiber density of the fibers on the skin contact surface side of the skin contact sheet is higher than the fiber density of the fibers on the non-skin contact surface side of the skin contact sheet, and the skin contact sheet The number density of the microcapsules on the skin contact surface side of the sheet is lower than the number density of the microcapsules on the non-skin contact surface side of the skin contact sheet. As a result, in addition to the fact that the microcapsules and cold components are not easy to directly contact the wearer, and it is not easy to cause irritation to the wearer’s skin, because the microcapsules and cold feeling components exist in the vicinity of the wearer, they can be used for packaging The person quickly provides the cooling effect caused by the cooling component. In addition, because the microcapsules are widely distributed in the thickness direction of the absorbent article, they can provide the cooling effect caused by the cooling component for a long time. Therefore, the absorbent article described in aspect 1 has the effect of imparting a moderate cooling effect early and for a long time.

[Pattern 2]

The absorbent article according to aspect 1, wherein the absorbent article further includes the non-skin contact sheet coated on the skin contact sheet The adhesive part of the surface, the adhesive part holds the microcapsule.

The absorbent article described in aspect 2 holds the microcapsules on the non-skin contact surface of the skin contact sheet, so the microcapsules are not easily changed even when the wearer of the absorbent article moves. Its position, and the microcapsule is not easy to move to the skin contact surface of the skin contact sheet. As a result, it is difficult to cause excessive irritation (cold effect) to the wearer's skin. Therefore, the absorbent article described in aspect 2 has the effect of imparting a moderate cooling effect by the cooling component to the wearer's skin.

[Pattern 3]

The absorbent article according to aspect 1 or 2, wherein the fiber diameter of the fiber on the skin abutting surface side of the skin abutting sheet is larger than the fiber diameter of the fiber on the non-skin abutting surface side of the skin abutting sheet The diameter is thinner.

In the absorbent article described in aspect 3, the fiber diameter of the fiber on the skin-contact surface side of the skin-contact sheet is smaller than the fiber diameter of the fiber on the non-skin-contact surface side of the skin-contact sheet. As a result, in addition to the form where the number density of microcapsules on the skin contact surface side of the skin contact sheet is lower than the number density of microcapsules on the non-skin contact surface side of the skin contact sheet, micro The capsule does not easily move to the skin contact surface of the skin contact sheet. Therefore, the absorbent article described in aspect 3 has the effect of imparting a moderate cooling effect early and for a long time.

[Pattern 4]

The absorbent article according to any one of aspects 1 to 3, wherein the absorbent article does not have the microcapsules on the skin contact surface of the skin contact sheet.

The absorbent article described in aspect 4 does not have microcapsules on the skin-contacting surface of the skin-contacting sheet, so it is difficult to give excessive stimulation (cold sensation effect) due to the cold component to the skin of the wearer. Therefore, the absorbent article described in aspect 4 has an effect of imparting a moderate cooling effect by the cooling component to the wearer's skin.

[Pattern 5]

The absorbent article according to any one of aspects 1 to 4, wherein 90% by mass or more of the microcapsules has a particle size of 40 μm or more and less than 80 μm.

In the absorbent article according to aspect 5, since 90% by mass or more of the microcapsules have a particle size of 40 μm or more and less than 80 μm, the number density of the microcapsules on the skin contact surface side of the skin contact sheet is higher than that of the skin contact sheet. The number density of the microcapsules on the non-skin contact surface side of the contact sheet is lower, and the absorbent article tends to form a form that does not have the aforementioned microcapsules on the skin contact surface of the skin contact sheet. Therefore, the absorbent article according to aspect 5 has an effect of imparting a moderate cooling effect early and for a long time.

[Pattern 6]

The absorbent article according to any one of aspects 1 to 5, wherein the microcapsules have a mass ratio of 4:1 to 1:4 with a mass ratio of 40 μm or more and less than The part having a particle size of 60 μm and the part having a particle size of 60 μm or more and less than 80 μm.

In the absorbent article described in aspect 6, because the microcapsules have a specific particle size, the number density of the microcapsules on the skin-contacting surface side of the skin-contact sheet is higher than that on the non-skin-contacting surface side of the skin-contact sheet. The number density of the microcapsules is lower, and the absorbent article tends to form a form that does not have the above-mentioned microcapsules on the skin contact surface of the skin contact sheet. Therefore, the absorbent article described in aspect 6 has an effect of imparting a moderate cooling effect early and for a long time.

[Pattern 7]

The absorbent article according to any one of aspects 1 to 6, wherein the absorbent article further includes an auxiliary sheet between the skin contact sheet and the clothing contact sheet, and the auxiliary sheet contains more than the aforementioned The number density of the number density of the microcapsules between the central surface of the skin contact sheet in the thickness direction and the non-skin contact surface is lower.

In the absorbent article according to aspect 7, since the auxiliary sheet contains microcapsules of a predetermined number density, the microcapsules are widely distributed in the thickness direction of the absorbent article. Therefore, the absorbent article described in aspect 7 has the effect of allowing the cooling effect to act on the skin of the wearer for a long time.

[Pattern 8]

The absorbent article according to aspect 7, wherein the absorbent article is One step is provided with an adhesive part applied to the surface of the auxiliary sheet on the side of the skin contacting the sheet, and it holds the microcapsules.

The absorbent article described in aspect 8 retains the microcapsules at the adhesive portion coated on the side of the skin contacting the sheet of the auxiliary sheet, so even when the wearer of the absorbent article moves, the microcapsules are not easily changed. Position, the microcapsule is not easy to move to the skin contact surface of the skin contact sheet. As a result, it is difficult to give excessive stimulation (cold sensation effect) due to the cold sensation component to the skin of the wearer. Therefore, the absorbent article described in aspect 8 has the effect of imparting a moderate cooling effect by the cooling component to the wearer's skin.

[Pattern 9]

The absorbent article according to any one of aspects 1 to 8, wherein the absorbent article has: an absorbent article main body, and one extending from the absorbent article main body toward both sides of the absorbent article in the width direction For the pair of wings, the skin contact sheet and the clothing contact sheet form the pair of wings.

The absorbent article described in aspect 9 is a pair of wings equipped with the above-mentioned microcapsules, does not cause excessive stimulation (cold sensation effect) due to cold components, etc., which are prone to sultry buttocks, and can provide cold for a long time The cooling effect caused by the sensory component. Therefore, the absorbent article described in aspect 9 has the effect of imparting a moderate cooling effect in an early stage and for a long time.

Hereinafter, the absorbent article of the present invention will be described in detail using appropriate drawings.

Figures 1 to 4 are one of the embodiments of the present invention (hereinafter referred to as "First Embodiment") A diagram for explaining the absorbent article 1. In detail, Fig. 1 is an absorbent article 1 according to the first embodiment, specifically, a front view of a sanitary napkin. Fig. 2 is a rear view of the absorbent article 1 shown in Fig. 1. Fig. 3 is an end view of the III-III end face of Fig. 1. Fig. 4 is an enlarged view of area IV in Fig. 3. In addition, FIG. 3 omits the microcapsule existence area 51 and the microcapsule 55, and the bonding portion 59 and the bonding portion 63.

The absorbent article 1 has a longitudinal direction L and a widthwise direction W, and has an absorbent article body 3 extending in the longitudinal direction L; a pair of wings, that is, a pair of side wings 5, It extends from the absorbent article body 3 toward the outside in the widthwise direction W; and a pair of hip wings 7. The pair of side flaps 5 are arranged near the center in the longitudinal direction L of the absorbent article 1. The pair of hip wings 7 are arranged behind the absorbent article 1 and extend to the rear end in the longitudinal direction L of the absorbent article 1.

The absorbent article main body 3 includes a liquid-permeable sheet 9, a liquid-impermeable sheet 11, and an absorber 13 between the liquid-permeable sheet 9 and the liquid-impermeable sheet 11. The pair of side wings 5 of the absorbent article 1 has: a skin contact sheet 17 with a skin contact surface 15, a clothing contact sheet 21 with a clothing contact surface 22, and a skin contact sheet 17 and clothing The auxiliary sheet 19 between the sheets 21 abuts. In addition, the pair of hip wing portions 7 also have the same as the pair of side wings 5: a skin contact sheet 17 with a skin contact surface 15, a clothing contact sheet 21 with a clothing contact surface 22, and skin The auxiliary sheet 19 between the contact sheet 17 and the clothing contact sheet 21.

In the absorbent article 1, the absorbent article body portion 3 has an adhesive portion 23 fixed to the liquid impermeable sheet 11. In the absorbent article 1, specifically, the absorbent article body portion 3 is fixed to the container via the adhesive portion 23 The inside of the person’s clothing.

The absorbent article 1 has: a squeezing part 29 formed on the absorbent article body 3 and formed by squeezing the liquid-permeable sheet 9 and the absorbent body 13, and penetrating the liquid-permeable sheet 9 and the opening of the absorbent body 13 35; and a sealing portion 37 (squeezing portion) for sealing the outer edge of the absorbent article 1, which is formed by squeezing the liquid-permeable sheet 9 and the liquid-impermeable sheet 11.

The liquid-permeable sheet 9 of the absorbent article main body 3, the skin contact sheet 17 of the side flap part 5, and the skin contact sheet 17 of the hip flap part 7 are continuous, and are formed of a single sheet (nonwoven fabric). In addition, the liquid impermeable sheet 11 of the absorbent article body 3, the garment abutment sheet 21 of the side flap portion 5, and the garment abutment sheet 21 of the hip flap portion 7 are continuous and are formed of a single sheet (film) .

The absorbent article 1 has a folded part 41 formed by folding the liquid-permeable sheet 9 outward in three times, and a pressing part 33 formed by pressing the folded part 41. In addition, the folded portion 41 is formed to prevent the absorbed body fluid from flowing into the widthwise direction of the absorbent article, that is, to prevent the direction from the absorbent article body 3 to the side flaps 5 and the hip flaps 7 Leaky wall.

In the absorbent article 1, the liquid permeable sheet 9 of the absorbent article body 3 has a plurality of ridges 43 extending in the longitudinal direction L and a plurality of grooves 47 arranged between the ridges 43 Non-woven cloth. In addition, the skin contact sheet 17 of the side flap 5 is a non-woven fabric having a plurality of ridges 45 extending in the longitudinal direction L and a plurality of grooves 49 arranged between the ridges 45. In addition, the same applies to the hip wings 7. In addition, in FIG. 1, the upper ridge 43 and the ridge 45, and the groove 47 and the groove 49 are omitted for convenience.

The pair of side flaps 5 have a pair of adhesive portions 25 fixed to the garment abutment surface 22 of the garment abutting sheet 21. Specifically, the absorbent article 1 has a pair of side flaps 5 sandwiching the adhesive portion 25 In addition to being folded to face the liquid impermeable sheet 11, it is fixed to the outer side of the wearer's clothing via a pair of adhesive parts 25.

A pair of hip wings 7 has a pair of adhesive parts 27 fixed to the garment abutment surface 22 of the garment abutment sheet 21, and the pair of hip wings 7 is not folded but passes through the pair of adhesive parts 27 is fixed on the inside of the wearer's clothing.

The pair of side flaps 5 have sealing portions 39 that seal the outer edges of the absorbent article 1 and are formed by pressing the skin contact sheet 17 and the clothing contact sheet 21. In addition, the pair of buttocks 7 has a pressing part 31 formed by pressing a skin contact sheet 17 having a skin contact surface 15, an auxiliary sheet 19, and a clothing contact sheet 21. In addition, the pair of hip wing portions 7 have a sealing portion 39 that seals the outer edge of the absorbent article 1 by squeezing the skin contact sheet 17, the clothing contact sheet 21, and the desired skin The contact sheet 17 is formed.

The pair of side wings 5 and the pair of hip wings 7 each have a microcapsule existence region 51. As shown in Figure 4, where the microcapsules exist 51. The microcapsules 55 containing cold components are present inside the skin contact sheet 17. The number density of the microcapsules 55 on the skin contact surface 15 side of the skin contact sheet 17 is higher than that of the non-skin contact sheet 17 The number density of the microcapsules 55 on the side of the junction 57 is lower. Also, although not shown, in the first embodiment, the skin contact sheet 17 is formed of cloth, and the fiber density of the skin contact surface 15 side of the skin contact sheet 17 is higher than that of the non-skin contact sheet 17 The fiber density on the side 57 is higher.

In this way, the cooling effect caused by the cooling component in the microcapsule 55 can act on the wearer more quickly than when the microcapsule 55 only exists between the skin contact sheet 17 and the auxiliary sheet 19. In addition, since the number density of the microcapsules 55 on the skin contact surface 15 side of the skin contact sheet 17 is lower than the number density of the microcapsules 55 on the non-skin contact surface 57 side of the skin contact sheet 17, and the skin The fiber density of the skin contact surface 15 side of the contact sheet 17 is higher than the fiber density of the non-skin contact surface 57 side of the skin contact sheet 17, so the microcapsules 55 are less likely to exist on the skin contact sheet 17 At the junction 15, the cold component in the microcapsule 55 is not easy to directly contact the skin of the wearer, and it is not easy to cause excessive stimulation (cold effect) caused by the cold component to the skin of the wearer.

As shown in FIG. 4, in the first embodiment, the absorbent article 1 is provided on the non-skin contact surface 57 of the skin contact sheet 17, specifically, the non-skin contact sheet 17 is applied to the skin contact sheet 17. The interface 59 of the surface 57. The next part 59 is applied to the non-skin contact surface 57 of the skin contact sheet 17 in a wave-like coating pattern, and covers a part of the non-skin contact surface 57 of the skin contact sheet 17. Then part 59 joins the skin The contact sheet 17, and the auxiliary sheet 19, and although not shown in FIG. 4, hold the microcapsules 55 present on the outside of the skin contact sheet 17, specifically, the skin contact sheet 17, and the auxiliary sheet Between 19 microcapsules 55.

With this, the microcapsule 55 is not easy to move to the skin contact surface 15 of the skin contact sheet 17, the microcapsule 55 is not likely to exist on the skin contact surface 15 of the skin contact sheet 17, and the cold components in the microcapsule 55 are not likely to be directly directly Contact with the skin of the wearer, it is not easy to cause excessive stimulation (cold effect) caused by the cold component to the wearer's skin.

As shown in FIG. 4, the absorbent article 1 according to the first embodiment does not have microcapsules 55 on the skin contact surface 15 of the skin contact sheet 17. In this way, the cold component in the microcapsule 55 is not likely to directly contact the skin of the wearer, and it is not easy to cause excessive stimulation (cold effect) caused by the cold component to the skin of the wearer.

As shown in FIG. 4, in the absorbent article 1 according to the first embodiment, the auxiliary sheet 19 includes a center surface 65 in the thickness direction of the skin contact sheet 17 and a non-skin contact surface 57 inside the auxiliary sheet 19 The number density of the microcapsules 55 in the middle is smaller than the number density of the microcapsules 55. In this way, since the microcapsules 55 are widely distributed in the thickness direction of the absorbent article 1, the cooling effect caused by the cooling component can be provided for a long time.

In addition, in this specification, the thickness (mm) of the central surface in the thickness direction is defined and measured as follows.

Prepare FS-60DS manufactured by Daiei Scientific Precision Manufacturing Co., Ltd. [measurement surface 44mm (diameter), measurement pressure 3g/cm ² ], under standard conditions (temperature 23±2℃, relative humidity 50±5%), absorb Five different parts of the body were pressurized, the thickness of each part after 10 seconds of pressurization was measured, and the average value of the five measurements was taken as the thickness.

As shown in FIG. 4, the absorbent article 1 according to the first embodiment has an adhesive portion 63 applied to the side surface 61 of the skin contact sheet of the auxiliary sheet 19. In addition, the adhesive portion 63 is coated on the skin-contact sheet side surface 61 of the auxiliary sheet 19 in a wave-like coating pattern, and covers a part of the skin-contact sheet side surface 61 of the auxiliary sheet 19. The adjoining part 63 joins the auxiliary sheet 19 and the skin contact sheet 17, and although it is not shown in FIG. 4, it holds the microcapsule 55 existing between the auxiliary sheet 19 and the skin contact sheet 17.

With this, the microcapsule 55 is not easy to move to the skin contact surface 15 of the skin contact sheet 17, the microcapsule 55 is not likely to exist on the skin contact surface 15 of the skin contact sheet 17, and the cold components in the microcapsule 55 are not likely to be directly directly Contact with the skin of the wearer, it is not easy to cause excessive stimulation (cold effect) caused by the cold component to the wearer's skin. In addition, since the adhesive portion 63 also holds the microcapsule 55 at a position away from the skin contact surface 15 of the skin contact sheet 17, the microcapsules 55 are widely distributed in the thickness direction of the absorbent article 1, and the absorbent article 1 The cold component in the microcapsule 55 acts on the wearer for a long time.

In the absorbent article of the present invention, the skin contact sheet is composed of fiber-containing cloth. In addition, in the absorbent article of the present invention, the fiber density of the above-mentioned fibers on the skin-contact surface side of the skin-contact sheet is higher than that of the skin-contact sheet. It is desirable that the fiber density of the above-mentioned fibers on the non-skin contact surface side of the sheet is higher. Since the number density of the microcapsules on the skin contact surface side of the skin contact sheet is easier to form a form lower than the number density of the microcapsules on the non-skin contact surface side of the skin contact sheet, and the skin contact The skin contact surface of the thin sheet is likely to form a form in which microcapsules do not exist.

Examples of the fibers on the skin-contact surface side of the skin-contact sheet include fibers between the center surface in the center of the skin-contact sheet in the thickness direction and the skin-contact surface of the skin-contact sheet. In addition, the fibers on the non-skin-contact surface side of the skin-contact sheet include fibers between the center surface in the center in the thickness direction of the skin-contact sheet and the non-skin-contact surface of the skin-contact sheet.

In this manual, the fiber density of the skin contact sheet is determined by immersing the sample in liquid nitrogen, then dividing the immersed sample into two, and observing the cross section with a microscope, such as an electron microscope or an optical microscope To judge.

In the absorbent article of the present invention, although the base amount of the microcapsules varies depending on the concentration and amount of the cold component contained, it is preferably 0.5-12g/m ² , and more preferably 1.0-10g /m ² . If the above-mentioned base amount is less than 0.5g/m ² , the cooling component contained in the microcapsules may not easily exert its effect. If the above-mentioned base amount exceeds 12g/m ² , it may cause excessive irritation to the wearer’s skin (cold Sensation).

In the absorbent article of the present invention, although the number density of microcapsules on the skin-contacting surface side of the skin-contacting sheet is lower than the number density of microcapsules on the non-skin-contacting surface side of the skin-contacting sheet, For the area on the skin contact surface side of the skin contact sheet, it can be mentioned: the thickness of the skin contact sheet The area between the center surface in the center of the degree direction and the skin contact surface of the skin contact sheet. In addition, the area on the non-skin contact surface side of the skin contact sheet includes the central surface in the center in the thickness direction of the skin contact sheet and the area between the non-skin contact surface of the skin contact sheet.

In this specification, the size of the number density of the microcapsules and the fiber density of the skin contact sheet are similarly judged visually. In addition, from the viewpoint of identification, the microcapsules may be colored. For example, when the microcapsules are formed of water-soluble starch, they can be colored with iodine or the like.

In the absorbent article of the present invention, it is preferable that the fiber diameter of the fiber on the skin contact surface side of the skin contact sheet is smaller than the fiber diameter of the fiber on the non-skin contact surface side of the skin contact sheet, and the skin contact sheet The fiber diameter of the fibers on the skin contact surface side of the sheet is more preferably 0.20 to 0.90 times the fiber diameter of the fibers on the non-skin contact surface side of the skin contact sheet, more preferably 0.25 to 0.80 times, and still more Ideally, it is 0.30~0.70 times. By setting the fiber diameter of the fibers on the skin-contacting surface side of the skin-contact sheet to be smaller than the fiber diameter of the fibers on the non-skin-contacting surface side of the skin-contact sheet, the microcapsules are less likely to exist in the skin-contact sheet The skin contact surface of the microcapsules makes it difficult for the cold components in the microcapsules to directly touch the skin of the wearer, and it is not easy to cause excessive stimulation (cold effect) caused by the cold components to the wearer’s skin.

Examples of the fibers on the skin-contact surface side of the skin-contact sheet include fibers between the center surface in the center of the skin-contact sheet in the thickness direction and the skin-contact surface of the skin-contact sheet. In addition, the fibers on the non-skin-contact surface side of the skin-contact sheet include fibers between the center surface in the center in the thickness direction of the skin-contact sheet and the non-skin-contact surface of the skin-contact sheet.

In this specification, the fiber diameter is measured by immersing a sample in liquid nitrogen, then dividing the immersed sample into two, and using a microscope, such as an electron microscope, to take a cross-sectional image of the fiber. The fiber diameter is calculated by the method of calculating the average value.

In the absorbent article of the present invention, the aforementioned microcapsule means a capsule having a size of 1 to 1,000 μm in diameter and having a space containing a core material (a second functional component).

The above-mentioned capsule contains a core material and has no particular limitation on its external shape as long as the release of the core material can be controlled. For example, external shapes such as a spherical shape and an amorphous shape can be mentioned. In addition, the above-mentioned capsule may be a single-core type having one space for holding a core material, or a multi-core type having a plurality of spaces for holding a core material. As for the shape of the above-mentioned space, a spherical shape, an amorphous shape, and the like can be mentioned.

As an example of the above-mentioned microcapsules, those that are spherical in appearance and have a multi-nuclear space.

The above-mentioned microcapsules are preferably water-disintegratable microcapsules.

The water-disintegratable microcapsule releases the cold-sensing component contained in it by contact with liquid (aqueous solution) such as body fluids. Specifically, if a water-disintegratable microcapsule is in contact with a liquid, the material of the microcapsule is dissolved in water and collapsed. If the microcapsule is in contact with the liquid, the microcapsule expands in water and its strength decreases. Disintegration caused by the release of cold components.

Water-disintegrating microcapsules ideally have water solubility in the range of 10~300g for 100g of water at 25°C, more preferably have water solubility in the range of 20~200g, and even more ideally have water solubility in the range of 30~100g .

The above-mentioned water solubility is measured in accordance with the No. 105 flask method of the OECD guidelines except that the test temperature is set at 25°C.

As for the materials of the above-mentioned microcapsules, those well known in the technical field can be cited, such as sugars, such as monosaccharides (such as glucose), disaccharides (such as sucrose), polysaccharides (such as dextrin, glucomannan) Sugars, sodium alginate, water-soluble starch, etc.), gels, water-soluble polymers (for example: polyvinyl alcohol, polyvinyl acetate, etc.), etc.

The cold-sensing component that can contain the above-mentioned microcapsules includes those known as cold-sensing materials in the technical field, for example: those that act on receptor activation channels (TRPM8) located in skin nerves, such as mint Alcohol (such as 1-menthol) and its derivatives, methyl salicylate, camphor, essential oils derived from plants (such as peppermint, eucalyptus), and the like. In addition, the above-mentioned cold component includes alcohol, such as methanol and ethanol, whose surrounding temperature is lowered by the heat of vaporization.

Microcapsules containing cold sensation components have been sold, for example, INCAP (trade name) sold by Symrise Corporation.

In the absorbent article of the present invention, the above-mentioned microcapsules are desirably 90% by mass or more, more desirably 95% by mass or more, and even more desirably 97% by mass or more have a particle size of 40 μm or more and less than 80 μm. Since 90% by mass or more of the aforementioned microcapsules have the aforementioned particle size, the microcapsules are easily distributed widely in the thickness direction of the absorbent article.

In the absorbent article of the present invention, the above-mentioned microcapsules preferably contain a mass ratio of 4:1 to 1:4, and more preferably contain 3:1 to 1:3 More preferably, the mass ratio includes a part having a particle size of 40 μm or more and less than 60 μm and a part having a particle size of 60 μm or more and less than 80 μm in a mass ratio of 2:1 to 1:2. Since the above-mentioned mass ratio is in the above-mentioned range, the microcapsules are easily distributed widely in the thickness direction of the absorbent article.

In this specification, the particle size of the aforementioned microcapsules is measured using a sieve. For example, the mass ratio of microcapsules having a particle size of 40 μm or more and less than 80 μm is calculated by calculating the mass ratio of microcapsules that pass through an 80 μm sieve and remain on a 40 μm mesh sieve.

In addition, the portion of the microcapsule having a mass ratio of a particle size of 40 μm or more and less than 60 μm can be calculated from the mass ratio of the sieve passing through a sieve with a 60 μm mesh and remaining on a sieve with a 40 μm mesh.

The absorbent article of the present invention preferably does not have microcapsules on the skin contact surface of the skin contact sheet as shown in the first embodiment. The microcapsules and the cold components contained therein are not easy to directly contact the user, so it is not easy to cause excessive stimulation (cold effect) caused by the cold components to the skin of the user.

The absorbent article of the present disclosure may have a small amount on the skin-contacting surface of the skin-contacting sheet to such an extent that it is difficult for the microcapsules to cause excessive irritation (cold effect) to the wearer's skin. As long as the amount of microcapsules on the skin contact surface of the skin contact sheet is small, it is difficult to cause excessive irritation (cold effect) to the wearer's skin.

In the absorbent article of the present invention, the skin-contact sheet may be a sheet well-known in the technical field as long as it is a fabric containing fibers. Examples of the fabric include those containing thermoplastic resin fibers such as the fibers. Woven fabrics, such as: hot air non-woven fabrics, spun-bonded non-woven fabrics, point-bonded non-woven fabrics, water jet non-woven fabrics, needle-punched non-woven fabrics, melt-blown non-woven fabrics, and combinations of these (such as SMS, etc.).

In the absorbent article of the present invention, it is desirable that the skin contact sheet has hydrophilicity. When the wearer sweats, the sweat easily penetrates into the skin contact sheet, and the cold components are quickly released from the microcapsules.

In addition, in the absorbent article of the present invention, the skin contact sheet may have a plurality of ridges extending in the longitudinal direction and a plurality of grooves arranged between the ridges as shown in the first embodiment. Non-woven. Such a non-woven fabric can be manufactured by methods described in Japanese Patent Application Publication No. 2008-25079, Japanese Patent Application Publication No. 2008-23326, Japanese Patent Application Publication No. 2009-30218, and the like. Specifically, a plurality of layers of fiber webs containing thermoplastic resin fibers are stacked, gas is sprayed on the stacked multi-layer fiber webs to form a concavo-convex structure, and then the fiber webs with concavo-convex structure are heated to heat the fiber web The intersecting parts of the thermoplastic resin fibers to produce the above-mentioned nonwoven fabric.

In the above method, the multilayer fiber web is placed on an air-permeable support member (such as a net-like support member), and while the air-permeable support member is moved in a predetermined direction, gas (usually air) is continuously sprayed on the surface of the multilayer fiber web. , A ridge and groove structure containing ridges and grooves can be formed on the surface of the multilayer fiber web. In addition, the lower surface of the multilayer fiber web has a shape that follows the shape of the air-permeable support member. For example, when the web placement surface of the net-like support member is flat, the bottom surface of the multilayer fiber web is slightly flat (therefore, the bottom surface of the formed nonwoven fabric is also slightly flat).

In the area where the gas is sprayed on the surface of the fiber web, grooves extending in the moving direction of the air-permeable supporting member are formed, and ridges are formed between two adjacent grooves. At this time, since the fibers in the area where the gas is sprayed move toward both sides of the groove, the fiber density of the ridge is usually formed higher than the fiber density of the groove.

The number, spacing, basis weight, fiber density, etc. of the ridges and grooves can be adjusted to the desired value by adjusting the number, diameter and spacing of the nozzles, the temperature and volume of the gas injected from the nozzles, and the tension of the fiber web. Range.

In the first embodiment, the fiber density of the fibers on the skin contact surface side of the skin contact sheet is higher than the fiber density of the fibers on the non-skin contact surface side of the skin contact sheet. However, such a nonwoven fabric is, for example, The multi-layer fiber web can be manufactured by setting the fiber density of the upper fiber web to be higher than the fiber density of the lower fiber web.

In the above method, the fiber density of the ridge (the fiber density of the skin contact surface side of the skin contact sheet) can be set higher than the fiber density of the groove (skin contact surface) by increasing the amount of gas ejected from the nozzle. The fiber density on the non-skin surface side of the contact sheet is high. In addition, a non-woven fabric having a higher fiber density in the ridge portion than in the groove portion can be produced by a method described in Japanese Patent Application Publication No. 2008-002034 and 2008-023311, for example.

In one of the embodiments of the present invention, the fiber diameter of the fibers on the skin contact surface side of the skin contact sheet is smaller than the fiber diameter of the fibers on the non-skin contact surface side of the skin contact sheet, but such skin Abutment thin The sheet can be manufactured by setting the fiber diameter of the upper fiber web to be thinner than the fiber diameter of the lower fiber web in a multilayer fiber web.

In the absorbent article of the present invention, the same as the skin contact sheet can be mentioned as a desired auxiliary sheet.

Next, an example of the manufacturing method of the absorbent article 1 based on the 1st Embodiment of this invention is demonstrated using FIGS. 5-7. In addition, in the following description, refer to FIGS. 1 to 4 for the symbols of the absorbent article.

As shown in FIG. 5, the non-woven fabric sheet 103 rolled out from the first non-woven fabric roll 101 is passed through the Z-folding member 105, which is well-known in this technical field, and then passed through the embossing device 107 to form a fold with a press portion 33. Section 41 folds the sheet 109. In addition, the upper surface of the folded sheet 109 forms the inner surface of the absorbent article.

In addition, the non-woven fabric sheet 103 forms the liquid permeable sheet 9 of the absorbent article 1, and the skin contact sheet 17 of the pair of side flaps 5 and the pair of hip flaps 7, and the folded portion 41 forms the folded portion of the absorbent article 1. The folding part 41 and the pressing part 33 of the folding part 41 form the pressing part 33 of the absorbent article 1.

In the part 111 of the folded sheet 109 that can form an absorbent article, the part 113 that can form a pair of side wings, the part 115 that can form a pair of hip wings, and the part that can form the trimming part that must be cut off 117, the adhesive is applied from the adhesive coater 119 along the conveying direction MD to form two adhesive portions 59 on the folded sheet 109, thereby forming the folded sheet 120 having adhesive portions as shown in FIG. 6.

Next, in the energy form of the folded sheet 120 with the adhesive The part 111 of the absorbent article that can form a pair of side wing parts 113, the part 115 that can form a pair of hip wing parts, and the part 117 that can form the trimming part that must be cut, are in the adjoining part 59 Above, the microcapsules 55 are coated from the microcapsule coating machine 121 along the conveying direction MD, and the microcapsule existing regions 51 are formed on the portions 113 of the folded sheet 109 that can form a pair of side flaps, and are A microcapsule existence region 53 is formed in each part of the part 115 of a pair of hip wing parts, and a folded sheet 123 having an adhesive portion and microcapsules as shown in FIG. 7 is formed.

In addition, a suction box 122 of the microcapsule coater 121 sandwiching the folded sheet 109 to suck the microcapsule 55 is provided.

In addition, in the skin contact sheet of the absorbent article of the present invention, the number density of microcapsules on the skin contact surface side and the number density of microcapsules on the non-skin contact surface side are adjusted by adjusting the microcapsule coating The air pressure of the machine, the suction pressure of the suction box provided on the opposite side of the microcapsule coating machine, etc. can be adjusted.

Next, the portion 113 that can form a pair of side wings, the portion 115 that can form a pair of hip wings, and the portion 117 that can form the trimming portion that must be cut off of the folded sheet 109 are along the conveying direction MD (Long side direction L of absorbent article 1) The adhesive is applied from the adhesive coating machine 124 to the part 113 that can form a pair of side wings, the part 115 that can form a pair of hip wings, and the part that must be cut out On the portion 117 of the trimming portion, and on the microcapsule existence area 51 and the microcapsule existence area 53, an adhesive portion 63 is formed to form a folded sheet 125 having an adhesive portion, a microcapsule, and an adhesive portion.

Next, on top of the flap portion 113 of the side flap portion of the turn-up sheet 125 having the microcapsules and the adhesive portion, and the portion 115 that must form the hip flap, the auxiliary rolled out from the second nonwoven roll 127 is stacked. The sheet 129 forms the first laminated sheet 131.

Next, on the first laminated sheet 131, an adhesive is applied from the adhesive coater 133, and the absorbent body 135 is stacked thereon to form the second laminated sheet 137.

In addition, the absorber 135 is manufactured by an absorber manufacturing apparatus 139 that is well known in this technical field. The absorber manufacturing apparatus 139 includes a material supply part 141, a suction tube 143, and a concave shape formed on the outer peripheral surface of the suction tube 143 145, and the suction unit 146.

Next, the second layered sheet 137 is passed through the embossing device 147 to form the press portion 29 of the absorbent article 1 on the second layered sheet 137, and then the second layered sheet 137 is passed through the through hole forming machine 149, by Here, the opening 35 of the absorbent article 1 is formed, and the third laminated sheet 151 is formed.

Next, the adhesive is applied to the third laminate sheet 151 from the adhesive coater 153, and then the film 156 is unrolled from the film roll 155 and stacked on the third laminate sheet 151, thereby forming the fourth laminate sheet 157. In addition, the film 156 forms the liquid impermeable sheet 11 of the absorbent article main body 3 of the absorbent article 1 and the garment contact sheet 21 of the side flaps 5 and the hip flaps 7.

The fourth laminated sheet 157 is passed through the embossing device 159, and the fourth laminated sheet 157 is pressed in the thickness direction to form the fifth laminated sheet 161.

The fifth layered sheet 161 is passed through a cutting device 163 equipped with a cutting roller and an anvil roller to cut the fifth layered sheet 161 at the boundary surface between the absorbent article 1 and the trimming portion that must be cut, and the absorbent is separated Item 1, and trimming part (not shown).

The separated trimming portion is cut off by attracting the garment abutting surface 22 by a suction device (not shown).

[Example]

Hereinafter, although the present invention is illustrated with examples, the present invention is not limited by these.

[Manufacturing Example 1] (1) Manufacturing of fiber mesh

It consists of a composite fiber with polyethylene terephthalate as the core component and polyethylene as the sheath component (average fineness: 3.3 dtex, average fiber length: 38 mm); and polyethylene terephthalate as the The core component is a mixture (mass ratio 4:3) of composite fibers (average fineness: 3.3 dtex, average fiber length: 51 mm) using polyethylene as the sheath component to form fiber web No. 1 (base weight: 35 g/m ² ).

It consists of a composite fiber with polyethylene terephthalate as the core component and polyethylene as the sheath component (average fineness: 1.7dtex, average fiber length: 45mm); and polyethylene terephthalate as the The core component is a mixture (mass ratio 1:1) of composite fibers (average fineness: 2.3 dtex, average fiber length: 45 mm) using polyethylene as the sheath component to form fiber web No. 2 (base weight: 25 g/m ² ).

(2) Manufacturing of non-woven fabric

The fiber web No. 2 is stacked on the fiber web No. 1 to form a stacked fiber web, and according to the method described in Japanese Patent Application Laid-Open No. 2008-23311, a skin contact sheet No. having a ridge and groove structure including ridges and grooves is formed. 1.

The various settings in the nonwoven fabric manufacturing device used are as follows.

The diameter of the injection port 332: 1.0mm (perfect circle)

Spacing of jet 322: 3.0mm

Jet gas temperature: 310℃

Air volume of injected gas per 1 injection port: 5L/min

Fiber web conveying speed: speed 100m/min

Breathable support member 310 (mesh support member): 70 mesh

Heat treatment performed by the heating part 340: heat treatment temperature is set to 140°C, and the heat treatment is performed for 6 seconds at a ventilation rate of 1.2 m/sec

(3) Manufacturing of absorbent articles

According to the manufacturing method shown in FIG. 5, the absorbent article No. 1 shown in FIGS. 1 to 4 was manufactured. In addition, the microcapsules contained menthol as a cold-sensing component, and applied so that the base amount became 1.5 g/m ² .

When observing the cross section of the side flap of absorbent article No. 1 with an electron microscope, the fiber density of the fibers on the skin-contacting side of the skin-contact sheet is higher than the fiber density of the fibers on the non-skin-contacting side of the skin-contact sheet higher. In addition, the fiber diameter of the fiber on the skin contact surface side of the skin contact sheet is smaller than the fiber diameter of the fiber on the non-skin contact surface side of the skin contact sheet.

In addition, the number density of microcapsules on the skin contact surface side of the skin contact sheet is lower than the number density of microcapsules on the non-skin contact surface side of the skin contact sheet. In addition, there are no microcapsules on the skin contact surface of the skin contact sheet.

[Manufacturing Example 2]

The nonwoven fabric was manufactured in the same manner as in Manufacturing Example 1, except that the point where the two webs No. 1 were overlapped and the microcapsules were applied, except that the coating pressure of the microcapsule coater was lowered and suction from the suction box was not performed. Absorbent article No.2. In addition, in Production Example 2, although the coating pressure of the microcapsule coater was lowered, the base amount of the microcapsules was the same as in Production Example 1.

When observing the cross section of the side flap of absorbent article No. 1 with an electron microscope, the microcapsules hardly penetrated into the inside of the skin contact sheet. In addition, there are no microcapsules on the skin contact surface of the skin contact sheet.

[Example 1]

After letting a plurality of volunteers put on absorbent article No. 1 and absorbent article No. 2, they obtained absorbent article No. 1 and felt cold earlier than absorbent article No. 2. The cold time is also a long answer.

1‧‧‧Absorbent articles

3‧‧‧Absorbent article body

5‧‧‧Wings

7‧‧‧Hip Wing

9‧‧‧Liquid permeable sheet

15‧‧‧Skin contact surface

17‧‧‧Skin contact sheet

29‧‧‧Press section

31‧‧‧Press section

33‧‧‧Press section

35‧‧‧Opening

37‧‧‧Sealing Department

39‧‧‧Sealing Department

41‧‧‧Folding part

51‧‧‧Microcapsule existence area

53‧‧‧Microcapsule existence area

Claims (9)

An absorbent article comprising: a skin contact sheet, an absorbent article having a skin contact surface and a non-skin contact surface, a clothing contact sheet, and microcapsules containing cold components, characterized by : The skin contact sheet includes a fabric containing fibers, and the fiber density of the fiber on the skin contact surface side of the skin contact sheet is higher than the fiber density of the fiber on the non-skin contact surface side of the skin contact sheet , The skin contact sheet is divided into: by the skin contact surface, the area on the skin contact surface side divided by the center surface in the center of the thickness direction of the skin contact sheet; and by the center surface, The skin-contact sheet contains the microcapsules in the area on the non-skin bottom contact surface that is divided from the non-skin contact surface, and the skin contact sheet is on the skin contact surface side in the area of the skin contact sheet The number density of the microcapsules is lower than the number density of the microcapsules on the non-skin contact surface side in the skin contact sheet area. The absorbent article according to claim 1, wherein the absorbent article further includes an adhesive part coated on the non-skin contact surface of the skin contact sheet, and the adhesive part holds the microcapsule. The absorbent article according to claim 1 or 2, wherein the fiber diameter of the fiber on the skin contact surface side of the skin contact sheet is larger than that of the non-skin contact surface of the skin contact sheet The fiber diameter of the aforementioned fiber on the side is thinner. Such as the absorbent described in item 1 or item 2 of the scope of patent application A product in which the absorbent article does not have the microcapsules on the skin contact surface of the skin contact sheet. The absorbent article as described in item 1 or item 2 of the scope of patent application, wherein 90% by mass or more of the aforementioned microcapsules have a particle size of 40 μm or more and less than 80 μm. The absorbent article described in item 1 or item 2 of the scope of patent application, wherein the aforementioned microcapsule contains a part having a particle size of 40 μm or more and less than 60 μm in a mass ratio of 4:1 to 1:4, and a part having a particle size of 60 μm. Above and less than 80 μm particle size. The absorbent article described in item 1 or item 2 of the scope of patent application, wherein the absorbent article further includes an auxiliary sheet between the skin contact sheet and the clothing contact sheet, and the auxiliary sheet contains The number density of the microcapsules is smaller than the number density of the microcapsules in the center surface of the skin contact sheet in the thickness direction and the non-skin contact surface. The absorbent article according to claim 7, wherein the absorbent article further includes an adhesive portion coated on the surface of the auxiliary sheet on the skin-contact sheet side, and it holds the microcapsules. The absorbent article described in item 1 or item 2 of the scope of the patent application, wherein the absorbent article has: an absorbent article body, and extending from the absorbent article body toward both sides of the absorbent article in the width direction The pair of wings, the skin contact sheet and the clothing contact sheet form the pair of wings.

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