CN113876495A

CN113876495A - Absorbent article and nonwoven fabric

Info

Publication number: CN113876495A
Application number: CN202110725450.7A
Authority: CN
Inventors: 植田麻穗
Original assignee: Unicharm Corp
Current assignee: Unicharm Corp
Priority date: 2020-07-01
Filing date: 2021-06-29
Publication date: 2022-01-04
Also published as: JP2022012539A; JP7241720B2

Abstract

The present invention provides an absorbent article which is easy for a user to perceive the function of pearl powder or pearl-derived components. The absorbent article (1) includes an exterior sheet (17) having an exterior surface. The absorbent article comprises pearl powder or a component derived from pearl. The exterior sheet is made of nonwoven fabric. The exterior surface has a glossiness of 5 or more.

Description

Absorbent article and nonwoven fabric

Technical Field

The present invention relates to an absorbent article and a nonwoven fabric.

Background

An absorbent article containing pearl-derived components or pearl-derived components is known. For example, pearl powder or pearl-derived components are known to have various functions as follows: the skin care composition has a function of supplying nutrients to the skin, a refreshing feeling, an antibacterial effect, a deodorizing effect, an antipruritic effect, an ultraviolet ray resistance effect, a moisturizing effect on the horny layer of the skin, a detoxifying effect, an inflammation removing effect, a blood purifying effect, a blood viscosity lowering effect, an effect of preventing skin aging by improving blood circulation by reducing fat in the blood, and a preventive effect on acne, eczema, and the like.

For example, patent document 1 describes an absorbent article having a liquid-permeable front sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the front sheet and the back sheet, wherein a mixture of a hydrophilic resin and calcium lactate is applied to at least the skin-contact surface side of the front sheet.

Documents of the prior art

Patent document

Patent document 1: japanese patent laid-open publication No. 2012 and 75655

Disclosure of Invention

Problems to be solved by the invention

One of the characteristics of pearls is that they have a unique pearl luster. On the other hand, pearl powder obtained by pulverizing pearl or the like or pearl-derived components are white powder having no pearl luster. In addition, the pearl-derived component obtained from pearl has the property of transparent liquid without pearl luster. Therefore, not limited to the absorbent article described in patent document 1, an absorbent article having pearl powder or pearl-derived components and having pearl powder and pearl-derived components can exert various functions derived from pearls, while the appearance of the absorbent article is unique from that of a general absorbent article, so that it is difficult for a user to recognize the function having pearl powder or pearl-derived components from the appearance of the absorbent article.

Accordingly, an object of the present invention is to provide an absorbent article having a function of pearl powder or pearl components derived therefrom which is easily perceived by a user.

Means for solving the problems

The absorbent article of the present invention is as follows. An absorbent article comprising an exterior sheet having an exterior face, wherein the absorbent article contains pearl powder or pearl-derived components, the exterior sheet is composed of a nonwoven fabric, and the exterior face has a glossiness of 5 or more.

ADVANTAGEOUS EFFECTS OF INVENTION

According to the present invention, an absorbent article and a nonwoven fabric having a function of pearl powder or pearl-derived components which can be easily perceived by a user can be provided.

Drawings

Fig. 1 is a plan view showing a configuration example of a disposable diaper according to an embodiment.

Fig. 2 is a bottom view showing a structural example of the disposable diaper according to the embodiment.

Fig. 3 is a sectional view taken along the line III-III of fig. 1.

Fig. 4 is a schematic diagram showing an example of arrangement of pearl powder or pearl-derived components in the disposable diaper according to the embodiment.

Description of the reference numerals

1. Disposable diapers (absorbent articles); 17. and (6) packaging the sheet.

Detailed Description

The present embodiment relates to the following aspects.

[ scheme 1]

An absorbent article comprising an exterior sheet having an exterior face, wherein the absorbent article contains pearl powder or pearl-derived components, the exterior sheet is composed of a nonwoven fabric, and the exterior face has a glossiness of 5 or more.

In the absorbent article, the outer surface of the outer sheet is formed of a nonwoven fabric having a predetermined glossiness. Therefore, the user easily perceives from the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl. Specifically, the user easily visually recognizes from the appearance of the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl.

[ scheme 2]

The absorbent article according to claim 1, wherein the absorbent article has a longitudinal direction and a width direction, and the glossiness of the exterior surface in the longitudinal direction is different from the glossiness of the exterior surface in the width direction.

In the absorbent article, the outer covering surface has different glossiness in the longitudinal direction and the width direction. Therefore, when the user takes the absorbent article, the gloss appears to change depending on the angle of the absorbent article, and therefore, the user easily feels the pearl-like gloss on the absorbent article. As a result, the user easily perceives from the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl. Specifically, the user easily visually recognizes from the appearance of the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl.

[ scheme 3]

The absorbent article according to claim 2, wherein the difference between the glossiness in the longitudinal direction and the glossiness in the width direction is 0.5 or more.

In the above absorbent article, the difference between the glossiness in the longitudinal direction and the glossiness in the width direction is in a predetermined range. Therefore, when the user takes the absorbent article, the user is likely to feel the pearl-like luster because the luster is likely to further change depending on the angle of the absorbent article. As a result, the user can easily visually recognize from the appearance of the absorbent article that the absorbent article has the function of pearl powder or pearl-derived components.

[ scheme 4]

The absorbent article according to any one of claims 1 to 3, wherein the exterior surface has an average friction coefficient (MIU) of 0.2 or more and less than 0.4 and an average deviation (SMD) of surface roughness of 3.1 μm or less.

In the absorbent article, the outer surface has a predetermined average friction coefficient (MIU) and a predetermined average deviation of surface roughness (SMD). Therefore, when the user comes into contact with the outer surface of the absorbent article, a smooth feeling due to a low average surface roughness (SMD) can be felt while a smooth feeling due to a high average friction coefficient (MIU) is felt. As a result, the user easily perceives from the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl. Specifically, the user can easily recognize from the tactile sensation of the exterior surface of the absorbent article that the absorbent article has a function of pearl powder or a pearl component.

[ scheme 5]

The absorbent article according to any one of claims 1 to 4, wherein the outer cover has an average deviation in friction coefficient (MMD) of 0.011 or less.

In the absorbent article, the outer cover has an average variation (MMD) in friction coefficient of 0.011 or less. Therefore, in the absorbent article, the user can feel more slippery when touching the exterior surface. As a result, the user easily perceives from the absorbent article that the absorbent article has a function of pearl powder or a component derived from pearl. Specifically, the user can easily recognize from the tactile sensation of the exterior surface of the absorbent article that the absorbent article has a function of pearl powder or a pearl component.

[ scheme 6]

The absorbent article according to any one of aspects 1 to 5, wherein the nonwoven fabric contains fibers having an average fiber diameter of 5 μm to 14 μm.

In the above absorbent article, the nonwoven fabric contains fibers having a predetermined average fiber diameter. Since the average fiber diameter is small, gaps between fibers can be reduced, and unevenness of the nonwoven fabric can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, the user easily recognizes from the appearance of the absorbent article that the absorbent article has the function of pearl powder or a component derived from pearl. Further, since the average fiber diameter is small, a plurality of fibers can be stably and reliably inserted between the protrusions of the finger fingerprint (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, the user can easily recognize from the tactile sensation of the exterior surface of the absorbent article that the absorbent article has a function of pearl powder or a pearl component.

[ scheme 7]

The absorbent article according to any one of claims 1 to 6, wherein the nonwoven fabric has an interfiber distance of 200 μm or less on the outer surface of the outer sheet.

In the absorbent article, the nonwoven fabric has a predetermined distance between fibers on the outer surface of the outer sheet. Since the distance between the fibers is small, the gaps between the fibers can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, the user easily recognizes from the appearance of the absorbent article that the absorbent article has the function of pearl powder or a component derived from pearl. Since the distance between the fibers is small, the plurality of fibers can be stably and reliably inserted between the protrusions of the finger fingerprint (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, the user can easily recognize from the tactile sensation of the exterior surface of the absorbent article that the absorbent article has a function of pearl powder or a pearl component.

[ scheme 8]

The absorbent article according to any one of claims 1 to 7, wherein the nonwoven fabric contains 30 to 100 mass% of the irregularly-shaped cross-section fibers.

In the above absorbent article, the nonwoven fabric contains a predetermined amount of the irregularly-shaped cross-section fibers. The profiled fiber has a smooth surface in one fiber, and therefore reflects light relatively easily, and is therefore excellent in gloss. Therefore, the user easily recognizes from the appearance of the absorbent article that the absorbent article has the function of pearl powder or a component derived from pearl.

[ scheme 9]

A nonwoven fabric for an absorbent article, comprising a 1 st surface and a 2 nd surface opposite to the 1 st surface, wherein the 1 st surface of the nonwoven fabric has a glossiness of 5 or more.

The non-woven fabric is applied to a material constituting an outer surface of a product having pearl powder or a component derived from pearl, so that a user can easily perceive from the appearance of the product that the product has the function of pearl powder or a component derived from pearl, and in particular, can easily visually recognize the product. As the product, an absorbent article can be cited.

[ scheme 10]

The nonwoven fabric according to claim 9, wherein the nonwoven fabric has a 1 st direction and a 2 nd direction orthogonal to the 1 st direction, and the glossiness of the 1 st surface in the 1 st direction is different from the glossiness of the 1 st surface in the 2 nd direction.

By applying the above nonwoven fabric to a material constituting the exterior surface of the product, the exterior surface has different glossiness in the longitudinal direction and the width direction. Therefore, when a user takes a product, it looks like the gloss is changed depending on the angle of the product, and thus, the user easily feels the pearl-like gloss on the product. As a result, the user can easily visually recognize from the appearance of the product that the product has the function of pearl powder or pearl-derived components.

[ scheme 11]

The nonwoven fabric according to claim 9 or 10, wherein the 1 st face has an average friction coefficient (MIU) of 0.2 or more and less than 0.4 and an average deviation (SMD) of surface roughness of 3.1 μm or less.

By applying the nonwoven fabric described above to a material constituting the exterior surface of the product, the exterior surface is provided with a predetermined average coefficient of friction (MIU) and a predetermined average deviation of surface roughness (SMD). Therefore, when the user comes into contact with the exterior surface of the product, the user can feel a smooth feeling due to a high average friction coefficient (MIU) and a smooth feeling due to a small average variation in surface roughness (SMD). As a result, the user easily perceives from the tactile sensation of the exterior side of the product that the product has the function of pearl powder or pearl-derived components.

[ scheme 12]

The nonwoven fabric according to any of claims 9-11, wherein the nonwoven fabric comprises fibers having an average fiber diameter of 5-14 μ ι η.

The nonwoven fabric comprises fibers having a predetermined average fiber diameter. Since the average fiber diameter is small, gaps between fibers can be reduced, and unevenness of the nonwoven fabric can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, by applying the nonwoven fabric to the material constituting the exterior face of the product, the user can easily recognize from the appearance of the product that the product has a function of pearl powder or a component derived from pearl. Further, since the average fiber diameter is small, a plurality of fibers can be stably and reliably inserted between the protrusions of the finger fingerprint (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, the user can easily recognize from the tactile sensation of the exterior surface of the product that the product has a function of pearl powder or pearl-derived components.

[ solution 13]

The nonwoven fabric according to any one of claims 9 to 12, wherein the nonwoven fabric has an interfiber distance of 200 μm or less on the 1 st surface of the nonwoven fabric.

The nonwoven fabric has a predetermined distance between fibers. Since the distance between the fibers is small, the gaps between the fibers can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, by applying the nonwoven fabric to the material constituting the exterior face of the product, the user can easily recognize from the appearance of the product that the product has a function of pearl powder or a component derived from pearl. Since the distance between the fibers is small, the plurality of fibers can be stably and reliably inserted between the protrusions of the finger fingerprint (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, the user can easily recognize from the tactile sensation of the exterior surface of the product that the product has a function of pearl powder or pearl-derived components.

[ scheme 14]

The nonwoven fabric according to any one of claims 9 to 13, wherein the nonwoven fabric contains 30 to 100 mass% of the irregularly-shaped cross-section fibers.

The nonwoven fabric contains a predetermined amount of the modified cross-section fibers. The profiled fiber has a smooth surface in one fiber, and therefore, the gap between fibers can be relatively reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, by applying the nonwoven fabric to the material constituting the exterior face of the product, the user can easily recognize from the appearance of the product that the product has a function of pearl powder or a component derived from pearl.

Embodiments of the absorbent article and nonwoven fabric of the present invention will be described below.

In the present embodiment, a tape-type disposable diaper will be described as an example of the absorbent article. However, the type and use of the absorbent article of the present invention are not limited to this example, and the present invention can be applied to other absorbent articles as long as the type and use do not depart from the scope of the subject matter of the present invention. Examples of other absorbent articles include disposable diapers (for infants and young children, adult diapers, belt-type diapers, and pants-type diapers), urine absorbent pads, light incontinence pads, sanitary napkins, and pantiliners.

Fig. 1 to 4 are views showing a configuration example of a tape-type disposable diaper 1 according to the embodiment. Fig. 1 and 2 are a plan view and a bottom view schematically showing a disposable diaper 1, respectively. Fig. 3 is a sectional view taken along the line III-III of fig. 1. Fig. 4 is a schematic diagram showing an example of arrangement of pearl powder or pearl-derived components of the disposable diaper 1.

The disposable diaper 1 has a longitudinal direction L, a width direction W, and a thickness direction T orthogonal to each other. The disposable diaper 1 has a longitudinal center line CL extending parallel to the width direction at the center in the longitudinal direction L. The disposable diaper 1 is divided into a front body part FB on the front side of the longitudinal center line CL and a rear body part BB on the rear side of the longitudinal center line CL.

The disposable diaper 1 includes a liquid-permeable sheet 3, a second sheet 5 (diffusion sheet), an absorber 7, a liquid-impermeable sheet 15, and an exterior sheet 17 in this order. The absorbent body 7 includes an absorbent core 9, a skin-side core-covering sheet 11 disposed on the skin side (the liquid-permeable sheet 3 side) of the absorbent core 9, and a non-skin-side core-covering sheet 13 disposed on the non-skin side (the liquid-impermeable sheet 15 side) of the absorbent core 9. The outer sheet 17 has an outer sheet outer surface 19 constituting the outer surface of the disposable diaper 1 and an outer sheet inner surface 21 on the liquid-impermeable sheet 15 side. The outer surface 19 of the outer sheet constituting the outer surface of the disposable diaper 1 may be referred to as an outer surface. Further, the second sheet 5 may not be provided. The skin-side core sheet 11 and the non-skin-side core sheet 13 may be combined into one sheet, or at least one of the two core sheets may not be provided.

The liquid-permeable sheet 3, the second sheet 5, and the exterior sheet 17 are each made of a nonwoven fabric containing thermoplastic resin fibers. The liquid-impermeable sheet 15 is composed of a film. Further, the liquid-impermeable sheet 15 may be formed of a nonwoven fabric containing thermoplastic resin fibers. The absorbent core 9 is composed of pulp fibers and/or a super absorbent polymer, and the skin-side core-covering sheet 11 and the non-skin-side core-covering sheet 13 are composed of cotton paper.

The disposable diaper 1 includes a pair of fastening tapes 101 and a target tape 103 as a target region, the pair of fastening tapes 101 are extended to both outer sides in the width direction W of the back body portion BB, and the target tape 103 is positioned at the center in the width direction W of the front body portion FB and engages the pair of fastening tapes 101. The target tape 103 is fixed to the outer sheet outer surface 19 of the outer sheet 17 by an adhesive portion 23 formed of an adhesive. The pair of surface fastener tapes 101 each include a plurality of hook-shaped fibrous bodies, and the target tape 103 is a fibrous structure including a plurality of loop-shaped fibrous bodies.

The disposable diaper 1 includes a pair of side sheets 105 on the skin side thereof, and the pair of side sheets 105 are disposed at both ends in the width direction W and extend in the longitudinal direction L. The pair of side sheets 105 are each formed of a nonwoven fabric containing thermoplastic resin fibers. The pair of side sheets 105 each have, on the inner side in the width direction W, a fixing portion 107 disposed at both ends in the longitudinal direction L and a leakage preventing wall 109 between the fixing portions 107. The leakage preventing wall 109 is positioned between the front and rear fixing portions 107 in the longitudinal direction L of the side sheet 105, and an outer end edge in the width direction W is fixed to the disposable diaper 1 to form a fixed end (not shown), while an inner end edge in the width direction W is not fixed to form a free end (not shown). The end portion of the leakage preventing wall 109 on the inner side in the width direction W includes a plurality of elastic members 111 extending in the length direction L. The elastic member 111 is made of an elastic body such as elastic yarn.

The disposable diaper 1 includes a plurality of elastic members 113 for leg gathers. The plurality of elastic members 113 extend in the longitudinal direction L between the pair of side sheets 105 and the exterior sheet 17. The elastic member 113 is made of an elastic body such as elastic yarn.

In the disposable diaper 1, the materials of the liquid-permeable sheet 3, the second sheet 5, the absorbent body 7, the liquid-impermeable sheet 15, and the exterior sheet 17 are joined to the adjacent materials by an adhesive. The absorbent core 9 is joined to the skin-side core-covering sheet 11 and the non-skin-side core-covering sheet 13 by an adhesive. In the disposable diaper 1 of the present embodiment, the exterior sheet 17 and the liquid-impermeable sheet 15 are bonded by the adhesive portion 23 formed of an adhesive.

In the present embodiment, the outer sheet 17 contains pearl powder or pearl-derived components. The pearl powder or pearl-derived component may be contained in the thermoplastic resin fibers constituting the outer sheet 17, may be laminated on the surface of the thermoplastic resin fibers, or may be applied to the outer sheet 17 to impregnate gaps between the thermoplastic resin fibers of the outer sheet 17. The pearl powder or pearl-derived component may be contained in the outer sheet 17 by attaching another sheet containing pearl powder or pearl-derived component to the outer sheet 17. Alternatively, pearl powder or pearl-derived components may be contained in other materials of the disposable diaper 1 (for example, the liquid-permeable sheet 3, the second sheet 5, the absorbent body 7, the liquid-impermeable sheet 15, and the side sheet 105).

In the present embodiment, as shown in fig. 4, in the exterior sheet 17, the amount of pearl powder or pearl-derived components on the exterior sheet outer surface 19 side of the exterior sheet 17 is larger than the amount of pearl powder or pearl-derived components on the exterior sheet inner surface 21 side of the exterior sheet 17. Wherein, in fig. 4, the amount of pearl powder or pearl-derived components is shown by "x". In the exterior sheet 17, the thickness of the layer containing pearl powder or pearl components on the outer surface 19 side of the exterior sheet is thicker than the thickness of the layer containing pearl powder or pearl components on the inner surface 21 side of the exterior sheet 17. Thus, the disposable diaper 1 can easily exhibit the function of pearl powder or pearl-derived components, and can suppress the decrease in the adhesive strength of the adhesive portion 23 due to the pearl powder or pearl-derived components. The amount of pearl powder or pearl-derived component on the outer surface 19 side of the outer sheet 17 may be smaller than or equal to the amount of pearl powder or pearl-derived component on the inner surface 21 side of the outer sheet 17.

In the present embodiment, the exterior sheet 17 containing pearl powder or pearl-derived components can be formed by applying a large amount of pearl powder or pearl-derived components from the exterior sheet outer surface 19 side of the exterior sheet 17 and applying a small amount of pearl powder or pearl-derived components from the exterior sheet inner surface 21 side using a known application device (exemplified by a spray coating device), for example.

In the present embodiment, the disposable diaper 1 is divided into an overlapping region 25 overlapping the absorbent body 7 in the thickness direction T and a non-overlapping region 27 not overlapping the absorbent body 7 in the thickness direction T. In the disposable diaper 1, the weight per unit area of the pearl powder or the pearl-derived component contained in the outer covering sheet 17 in the overlapping region 25 is higher than the weight per unit area of the pearl powder or the pearl-derived component contained in the outer covering sheet 17 in the non-overlapping region 27. Thus, the disposable diaper 1 easily exerts the function of pearl powder or pearl-derived components. In the case where pearl powder or pearl-derived components are contained in the liquid-permeable sheet 3, the second sheet 5, the absorbent body 7, and the liquid-impermeable sheet 15, the weight per unit area of the pearl powder or pearl-derived components in the overlapping region 25 may be higher than the weight per unit area of the pearl powder or pearl-derived components in the non-overlapping region 27.

In the present embodiment, as shown in fig. 4, in the overlapping region 25, the exterior sheet 17 includes pearl powder or pearl-derived components in a pearl powder or pearl-derived component placement region 29 extending in the longitudinal direction L and intermittently placed in the width direction W. This can suppress the decrease in the adhesive strength of the adhesive portion 23 of the disposable diaper 1 due to pearl powder or pearl-derived components.

In the present embodiment, the size of the amount of the pearl powder or pearl-derived component and the cumulative thickness of the pearl powder or pearl-derived component can be visually determined by observing the outer sheet 17 using a microscope (exemplified by an optical microscope and an electron microscope).

The pearl powder may be a pulverized product of shellfish having mother-of-pearl (hereinafter, abbreviated as "pearl shell"). The pearl shells include marine shellfish such as Pinctada martensii, Pinctada margaritifera (Pinctada margaritifera), Pinctada maxima (Nanyang pearl), Pinctada penguin pearl oyster (Pinctada margaritifera), abalone, Poecilomis japonica (freshwater pearl), and Cristaria plicata (freshwater pearl).

As the pearl-derived component, a pearl-derived protein, a pearl-derived peptide, a pearl-derived amino acid, and a hydrolysate thereof, and any combination thereof can be cited. Examples of pearls that can supply pearl-derived components include the aforementioned pearl shells, mother-of-pearl obtained from pearl shells, pearl jade (exemplified by jewel) made of pearl shells, and the like. Examples of pearl-derived ingredients include protein conchiolin and hydrolyzed conchiolin. Pearl-derived ingredients are well known, and commercially available under the name of Promois (trade Mark) BLACK PEARL-F, Promois (trade Mark) PEARL-P, Promois (trade Mark) PEARL-PF, for example, from Kabushiki Kaisha.

In the disposable diaper 1, as described above, the exterior sheet 17 includes the exterior sheet outer surface 19 as the exterior surface, and the exterior sheet 17 is formed of a nonwoven fabric containing thermoplastic resin fibers. In this case, the outer surface 19 (outer surface) of the outer sheet has a glossiness of 5 or more, preferably 6 or more. When the gloss of the exterior surface is 5 or more, the user can be reminded that the exterior sheet outer surface 19 is glossy like pearl. In this case, it is preferable that at least the color of the outer surface 19 (outer surface) of the outer sheet is white or white system color from the viewpoint of the color close to pearl.

Thus, the outer sheet outer surface 19 (outer surface: 1 st surface) of the outer sheet 17 is made of a nonwoven fabric having a gloss of 5 or more. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the user can easily perceive from the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a pearl component. Specifically, the user easily visually recognizes from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

Here, as a method of improving the glossiness of the outer sheet outer surface 19 (outer surface), for example, there is a method of making the outer sheet outer surface 19 smoother in a nonwoven fabric constituting the outer sheet 17. As a method for smoothing the outer surface, for example, there is a method of reducing the average fiber diameter of the fibers constituting the nonwoven fabric, shortening the distance between the fibers constituting the nonwoven fabric, and improving the orientation of the fibers constituting the nonwoven fabric (aligning the fibers). In this case, unevenness due to the fibers and unevenness due to gaps between the fibers in the nonwoven fabric can be reduced, and thus unevenness on the surface of the nonwoven fabric can be reduced. Alternatively, there is a method of using a profiled fiber as a fiber constituting the nonwoven fabric. Examples of the modified cross-section fiber include a fiber having a smooth surface in one fiber. Examples of the fibers having a smooth surface include fibers having a flat shape in cross section and fibers having a relatively flat surface which can partially reflect light substantially specularly.

Among them, the glossiness is based on JIS Z8741 (1997): the specular gloss was measured by using a gloss meter VG 8000 (manufactured by Nippon Denshoku industries Co., Ltd.). The incident angle and the light-receiving angle in the gloss meter IG-331 were both 60 °, and the measurement area was an ellipse having a major axis of 6mm × a minor axis of 3 mm. Further, as the measuring apparatus, a gloss meter IG-331 (manufactured by horiba, Ltd.) can be used.

In the present embodiment, in the disposable diaper 1, the gloss in the longitudinal direction L of the outer sheet outer surface 19 (outer surface) of the outer sheet 17 is different from the gloss in the width direction W of the outer sheet outer surface 19 (outer surface).

In this way, the exterior sheet 17 is composed of nonwoven fabrics having different glossiness on the exterior sheet outer surface 19 (exterior surface: 1 st surface) in the longitudinal direction L (1 st direction) and the width direction W (2 nd direction). Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, when the user takes the disposable diaper 1, the gloss appears to change depending on the angle of the disposable diaper 1, and therefore, the user easily feels the pearl-like gloss on the disposable diaper 1. As a result, the user can easily visually recognize from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

Here, as a method of making the outer sheet outer surface 19 (outer surface) have different glossiness in the longitudinal direction L and the width direction W, there is a method of improving the orientation of the fibers of the nonwoven fabric constituting the outer sheet outer surface 19. This also orients the irregularities on the outer surface 19 of the outer sheet, and the gloss of the outer surface 19 changes depending on the angle at which it is viewed.

In the present embodiment, in the disposable diaper 1, the difference between the gloss in the longitudinal direction L of the outer-sheet outer surface 19 (outer surface) of the outer sheet 17 and the gloss in the width direction W of the outer-sheet outer surface 19 (outer surface) is 0.5 or more, preferably 1.0 or more.

In this way, the exterior sheet 17 is composed of a nonwoven fabric in which the difference between the gloss in the longitudinal direction L and the gloss in the width direction W of the exterior sheet outer surface 19 (exterior surface: 1 st surface) is within a predetermined range. Therefore, when such a nonwoven fabric is applied to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the gloss is likely to further change depending on the angle of the disposable diaper 1 when the user takes the disposable diaper 1. Therefore, the user easily feels pearl-like gloss on the disposable diaper 1. As a result, the user can easily visually recognize from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl. The upper limit of the difference in glossiness is preferably 10, and more preferably 5. If the difference in gloss in both directions is too large, it is difficult to feel pearl-like gloss.

In the present embodiment, the outer sheet outer surface 19 (outer surface) of the outer sheet 17 has an average friction coefficient (MIU) of 0.2 or more and less than 0.4 and an average deviation (SMD) of surface roughness of 3.1 or less.

In this way, the exterior sheet 17 is composed of a nonwoven fabric having a predetermined average friction coefficient (MIU) and a predetermined average deviation of surface roughness (SMD) on the exterior sheet outer surface 19 (exterior surface: 1 st surface). Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, when a user comes into contact with the exterior surface of the disposable diaper 1, a smooth feeling due to a high average friction coefficient and a smooth feeling due to a small average variation in surface roughness can be felt. As a result, the user can easily recognize from the tactile sensation of the exterior surface of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

Among them, the following method can be used in order to increase the value of the average friction coefficient (MIU) of the outer sheet outer surface 19 (outer surface) of the outer sheet 17 (nonwoven fabric) and to reduce the value of the average dispersion (SMD) of the surface roughness. Namely the following method: the smoothness of the surface of the nonwoven fabric is improved by, for example, closely arranging fibers having a small average fiber diameter in a planar shape to improve the orientation of the fibers constituting the nonwoven fabric. Or the following method: the smoothness of the surface of the fiber itself is improved by lowering the glass transition temperature of the synthetic resin constituting the fiber, or the like.

The average friction coefficient (MIU), the average deviation of friction coefficient (MMD) (described later) and the average deviation of surface roughness (SMD) of the nonwoven fabric were measured using an automated surface tester (KESFB 4-AUTO-4 manufactured by Kyoto technologies Co., Ltd.).

In the present embodiment, the outer sheet outer surface 19 (outer surface) of the outer sheet 17 has an average variation (MMD) in friction coefficient of 0.011 or less.

In this way, the outer sheet outer surface 19 (outer surface) of the outer sheet 17 is formed of a nonwoven fabric having an average variation in friction coefficient (MMD) of 0.011 or less. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, smoothness is more likely to be felt when the user touches the exterior surface. As a result, the user can easily recognize from the tactile sensation of the exterior surface of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

The value of the average variation in friction coefficient (MMD) of the exterior sheet outer surface 19 (exterior surface) of the exterior sheet 17 (nonwoven fabric) can be reduced by the following method. The fibers constituting the nonwoven fabric are preferably fibers having a small average fiber diameter, and are uniformly arranged in a planar shape, whereby unevenness of the nonwoven fabric can be suppressed, and the value of average variation in the friction coefficient can be reduced. Alternatively, the value of the average variation in the friction coefficient can be reduced by suppressing unevenness of the nonwoven fabric due to the fibers by increasing the area ratio of embossing performed when forming the nonwoven fabric of the exterior sheet 17, or the like.

In the present embodiment, the nonwoven fabric of the exterior sheet 17 contains fibers having an average fiber diameter of 5 to 14 μm.

In this way, the exterior sheet 17 is made of a nonwoven fabric containing fibers having a predetermined average fiber diameter. Since the average fiber diameter of the fibers of the nonwoven fabric is small, gaps between the fibers in the nonwoven fabric can be reduced, and unevenness of the nonwoven fabric can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the user can easily recognize from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl. Since the average fiber diameter of the nonwoven fabric is small, the plurality of fibers can be stably and reliably inserted between the protrusions of the finger print (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the user can easily recognize from the tactile sensation of the exterior surface of the disposable diaper 1 that the absorbent article has a function of pearl powder or a pearl-derived component.

The average fiber diameter of the fibers of the nonwoven fabric was measured by the following method. (1) After freezing the nonwoven fabric with liquid nitrogen, the nonwoven fabric was cut into a predetermined size with a blade to obtain a sample. Three samples were prepared. (2) An enlarged image was taken with a microscope (VHX 7000, yonzhi) from a direction perpendicular to the section plane of the cut sample. The magnification is set to 700 times to 1000 times. (3) The fiber diameters of a plurality of fibers (for example, 50 fibers) were measured, and the average value was defined as the average fiber diameter of the sample. Then, the average value of the three samples was taken as the average fiber diameter of the fibers of the nonwoven fabric.

In the present embodiment, the nonwoven fabric has an interfiber distance of 200 μm or less on the outer surface 19 (outer surface) of the outer sheet 17 (nonwoven fabric).

In this way, the exterior sheet 17 is made of a nonwoven fabric having a predetermined distance between fibers on the exterior sheet outer surface 19 (exterior surface: 1 st surface). Since the distance between fibers of the nonwoven fabric is small, the gaps between the fibers can be reduced. This makes the nonwoven fabric relatively easy to reflect light, and therefore, the nonwoven fabric has excellent gloss. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the user can easily recognize from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl. Since the distance between the fibers of the nonwoven fabric is small, the plurality of fibers can be stably and reliably inserted between the protrusions of the finger print (the distance between the protrusions is generally considered to be about 460 ± 15 μm). Therefore, when the nonwoven fabric is touched with a finger, the nonwoven fabric can be easily attached to the skin, and a soft touch feeling can be reliably and stably obtained. Therefore, the user easily recognizes from the tactile sensation of the exterior surface of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

The distance between fibers of the nonwoven fabric was measured by the following method using a mercury porosimeter. (1) The nonwoven fabric was cut into pieces of 24mm × 15 mm. Three samples were prepared. (2) Three samples were placed in a sample cell of a mercury porosimeter (manufactured by shimadzu corporation) so as not to overlap each other, and then the volume of mercury (that is, pore volume) pressed into a space (that is, pores) between fibers constituting the samples was measured while gradually changing the pressure applied to the mercury. In addition, the measurement was performed at 22 ℃ and 65% RH. (3) The pore diameter D (μm) of the pores (i.e., the distance between fibers (μm) of the nonwoven fabric) was calculated from the following equation (E), and the relationship between the pore diameter D and the pore volume was obtained as a distribution curve (differential-integral curve) of the pore diameter D. In addition, with respect to various measurement conditions in the following formula (E), the surface tension of mercury is 0.483N/m, the contact angle is 130 DEG, and the mercury pressure is 0MPa to 414MPa (absolute pressure).

D＝-4γcosθ/P……(E)

(in the formula (E), D represents a pore diameter (distance between fibers), γ represents a surface tension of mercury, θ represents a contact angle, and P represents a pressure.)

In the present embodiment, the nonwoven fabric of the exterior sheet 17 contains 30 to 100 mass% of the irregularly-shaped cross-section fibers. The irregular cross-section fiber is a fiber with an irregular cross-section. Examples of the cross-sectional shape include a hollow fin cross-section, a flower cross-section, a flat multi-lobed cross-section, a core-sheath structure, a W-shaped cross-section, a Y-shaped cross-section, a triangular cross-section, a pentagonal cross-section, a star cross-section, and a special cross-shaped cross-section.

In this way, the exterior sheet 17 is made of a nonwoven fabric containing a predetermined amount of fibers having a different cross section. The irregular cross-section fiber has a relatively flat or smooth outer surface, and therefore reflects light relatively easily, and is excellent in gloss. Therefore, by applying such a nonwoven fabric to the exterior sheet 17 constituting the exterior surface of the disposable diaper 1, the user can easily recognize from the appearance of the disposable diaper 1 that the disposable diaper 1 has a function of pearl powder or a component derived from pearl.

[ examples ]

The present invention will be further described below by way of examples and comparative examples, but the present invention is not limited to these examples.

A nonwoven fabric having the structure of the exterior sheet 17 of the above embodiment (example) and a nonwoven fabric having no structure of the exterior sheet 17 of the above embodiment (comparative example) were produced, and physical property values were measured. Further, a disposable diaper 1 in which these nonwoven fabrics were used for the exterior sheet 17 was produced and subjected to a sensory test.

(1) Test specimen

Spun-bonded nonwoven fabrics (SB: examples 1 to 5) and SMS nonwoven fabrics (SMS: example 6) were produced as the nonwoven fabrics of the examples. On the other hand, as the nonwoven fabric of comparative example, a spunbonded nonwoven fabric (SB: comparative example 1), an SMS nonwoven fabric (SMS: comparative example 2), and a hot-air nonwoven fabric (AT: comparative example 3) were produced. Of these, 100 mass% of the irregularly-shaped cross-section fibers (Y-shaped cross section) were used for the nonwoven fabric of example 4, 50 mass% of the irregularly-shaped cross-section fibers (Y-shaped cross section) were used for the nonwoven fabric of example 5 (one of the two S layers), and 80 mass% of the irregularly-shaped cross-section fibers (Y-shaped cross section) were used for the nonwoven fabric of example 6 (two S layers of the two S layers and one M layer). A disposable diaper 1 in which these nonwoven fabrics were used for the outer sheet 17 was also manufactured.

(2) Evaluation of

(a) As the evaluation of the physical property values, the following physical property values were measured. I.e. the weight per unit area (g/m) of each nonwoven fabric²) Average friction coefficient (MIU), average deviation of friction coefficient (MMD), average deviation of surface roughness (SMD) (μm), fiber diameter (μm), distance between fibers (μm), gloss (0 °: gloss in the longitudinal direction when light was incident at 0 ° to the conveyance direction in the production of nonwoven fabrics), gloss (90 °: glossiness in the width direction when light was incident at 90 ° to the conveyance direction in the production of nonwoven fabrics) and glossiness difference (glossiness (0 °) to glossiness (90 °)).

(b) Sensory evaluation

The disposable diapers 1 each having a nonwoven fabric as the outer sheet 17 were subjected to the following sensory evaluations a to E. Sensory evaluation A, B was evaluated with respect to visual sensation (appearance of the exterior sheet 17), and sensory evaluations C to E were evaluated with respect to tactile sensation (feeling of the exterior sheet 17). Specifically, sensory evaluation a evaluated whether or not the exterior sheet 17 was perceived as "pearl component mixed" when observed in 5 ranks (highest evaluation 5). The sensory evaluation B evaluated whether or not the exterior sheet 17 was perceived to be "glowing and have a high-quality feeling" in 5 ranks (highest evaluation 5). Sensory evaluation C whether or not the exterior sheet 17 was touched with the "pearl component mixed" (highest evaluation 5) was evaluated in 5 ranks. Sensory evaluation D whether the touch of the exterior sheet 17 felt "smooth" was evaluated in 5 ranks (highest evaluation 5). Sensory evaluation E the feeling of softness when the exterior sheet 17 was touched was evaluated in 5 ranks (highest evaluation 5). In any sensory evaluation, the evaluation scale was 1: no perception at all, 2: little perception, 3: unclear, 4: slight feeling, 5: is obviously felt. The evaluation was entrusted to 30 persons who normally purchased disposable diapers to use for children. The values evaluated are the average thereof.

(3) Evaluation results

The evaluation results are shown in Table 1.

[ TABLE 1]

(1) Visual evaluation

In examples 1 to 3, the exterior surface had a gloss of 5 or more, and high evaluation was obtained in terms of visual (appearance) (4.6 to 4.9). Similarly, in examples 4 to 6 (profiled cross-section fibers), the outer surface had a gloss of 5 or more, and high visual (appearance) evaluation was obtained (3.6 to 4.6).

Among them, the reason why the visual evaluation of examples 1 to 3 is higher than that of examples 4 to 6 is considered as follows. That is, it is considered that this is because, although the nonwoven fabrics in examples 1 to 3 and 4 to 6 each have an interfiber distance of 200 μm or less, the difference between the glossiness in the longitudinal direction and the glossiness in the width direction is 0.5 or more in examples 1 to 3, and the nonwoven fabrics include fibers having a fiber diameter of 5 μm to 14 μm, but the nonwoven fabrics in examples 4 to 6 do not.

In comparative examples 1 to 3, the outer surface did not have a gloss of 5 or more, and thus was evaluated to be visually low (1.0 to 3.5).

Therefore, by applying the nonwoven fabrics of examples 1 to 6 to the exterior sheet, the user can easily visually recognize from the appearance of the disposable diaper that the disposable diaper has a function of pearl powder or a component derived from pearl.

(2) Tactile evaluation

In examples 1 to 3, the exterior surface had both MIU of 0.2 to 0.4 and SMD of 3.1 or less, and the exterior surface had an average deviation (MMD) of the friction coefficient of 0.011 or less, and high evaluation was obtained in terms of tactile sensation (touch feeling) (4.3 to 4.7).

In examples 4 to 6, the outer surface did not have at least one of MIU of 0.2 to 0.4 and SMD of 3.1 or less, and the outer surface did not have an average deviation of friction coefficient (MMD) of 0.011 or less, and was evaluated to be low in tactile sensation (touch feeling) (2.8 to 3.0).

In comparative examples 1 to 3, too, the outer surface had not at least one of MIU of 0.2 to 0.4 and SMD of 3.1 or less, and the outer surface had not an average deviation of friction coefficient (MMD) of 0.011 or less, and was evaluated to be low in tactile sensation (touch feeling) (1.0 to 3.5).

Therefore, by applying the nonwoven fabrics of examples 1 to 3 to the exterior sheet, the user can easily recognize from the tactile sensation of the exterior surface of the disposable diaper that the disposable diaper has the function of pearl powder or pearl-derived components.

The absorbent article and the nonwoven fabric of the present invention are not limited to the above embodiments, and can be appropriately combined, modified, and the like without departing from the object and the gist of the present invention.

Claims

1. An absorbent article comprising an exterior sheet having an exterior face, wherein,

the absorbent article comprises pearl powder or a component derived from pearl,

the outer sheet is made of non-woven fabric,

the exterior surface has a glossiness of 5 or more.

2. The absorbent article of claim 1,

the absorbent article has a longitudinal direction and a width direction,

the glossiness in the length direction of the exterior face is different from the glossiness in the width direction of the exterior face.

3. The absorbent article of claim 2, wherein,

the difference between the glossiness in the longitudinal direction and the glossiness in the width direction is 0.5 or more.

4. The absorbent article according to any one of claims 1 to 3, wherein,

the exterior surface has an average friction coefficient (MIU) of 0.2 or more and less than 0.4 and an average deviation (SMD) of surface roughness of 3.1 μm or less.

5. The absorbent article according to any one of claims 1 to 3, wherein,

the exterior surface has an average deviation in coefficient of friction (MMD) of 0.011 or less.

6. The absorbent article according to any one of claims 1 to 3, wherein,

the nonwoven fabric comprises fibers having an average fiber diameter of 5 to 14 μm.

7. The absorbent article according to any one of claims 1 to 3, wherein,

the nonwoven fabric has an interfiber distance of 200 [ mu ] m or less on the outer surface of the outer sheet.

8. The absorbent article according to any one of claims 1 to 3, wherein,

the nonwoven fabric contains 30-100 mass% of profiled-section fibers.

9. A nonwoven fabric for an absorbent article having a 1 st surface and a 2 nd surface opposite to the 1 st surface, wherein,

the 1 st surface of the nonwoven fabric has a glossiness of 5 or more.

10. The nonwoven fabric according to claim 9, wherein,

the nonwoven fabric has a 1 st direction and a 2 nd direction orthogonal to the 1 st direction,

the glossiness in the 1 st direction of the 1 st face is different from the glossiness in the 2 nd direction of the 1 st face.

11. The nonwoven fabric according to claim 9 or 10,

the 1 st surface has an average friction coefficient (MIU) of 0.2 or more and less than 0.4 and an average deviation (SMD) of surface roughness of 3.1 μm or less.

12. The nonwoven fabric according to claim 9 or 10,

13. The nonwoven fabric according to claim 9 or 10,

the nonwoven fabric has an interfiber distance of 200 [ mu ] m or less on the 1 st surface of the nonwoven fabric.

14. The nonwoven fabric according to claim 9 or 10,

the nonwoven fabric contains 30-100 mass% of profiled-section fibers.