WO2023189837A1

WO2023189837A1 - Absorbent article

Info

Publication number: WO2023189837A1
Application number: PCT/JP2023/010935
Authority: WO
Inventors: 弘光田房; 真路煙上; 匡志宇田; 侑樹西村
Original assignee: ユニ・チャーム株式会社
Priority date: 2022-03-31
Filing date: 2023-03-20
Publication date: 2023-10-05
Also published as: JP2023151583A

Abstract

The present invention provides an absorbent article capable of fully exhibiting the function of a water-soluble functional powder.　An absorbent article according to the present invention contains a sheet (7) in which a water-soluble functional powder (P_F) is fixed, the absorbent article being characterized in that the amount of the functional powder (P_F) fixed in the sheet (7) is 50 g/m² or greater and the percentage of the functional powder (P_F) that remains in a permeation/shedding test is 50% or greater.

Description

absorbent articles

The present invention relates to an absorbent article including a sheet to which water-soluble functional powder is fixed.

Among absorbent articles such as sanitary napkins and panty liners, absorbent articles loaded with water-soluble functional agents are known to provide various functions such as improved absorption performance and skin care effects. For example, Patent Document 1 describes an absorbent article that includes an absorbent body containing a superabsorbent polymer and an osmotic pressure adjusting agent (an example of a water-soluble functional agent) that adjusts the osmotic pressure of blood cell components in blood. Disclosed.

JP 2022-13798 Publication

In conventional absorbent articles equipped with such a water-soluble functional agent, when a powder-like functional agent is used as the water-soluble functional agent, the functional agent forms the absorbent article in powder form. They are placed at predetermined locations on various sheets. However, since the powdered water-soluble functional agent (hereinafter such functional agent is referred to as "water-soluble functional powder") cannot be fixed to the specified location on the sheet, it is difficult to wear absorbent articles. There is a risk that the functional powder may move from a predetermined location due to the wearer's movements or the like, and the functional powder may not be able to fully perform its functions.

The present invention has been made in view of these problems, and aims to provide an absorbent article that can fully exhibit the functions of water-soluble functional powder.

As a result of intensive studies to achieve the above object, the present inventors determined the amount of water-soluble functional powder fixed to the sheet and the residual rate of the functional powder in the permeation/dropping test, respectively. It has been found that by keeping the amount within this range, it is possible to secure an amount that allows the functional powder to fully exhibit its functions, while making it difficult for the functional powder to move from the sheet.
The present invention was completed based on this knowledge, and includes the following aspects.

(Aspect 1)
An absorbent article comprising a sheet to which a water-soluble functional powder is fixed,
The amount of the functional powder fixed to the sheet is 50 g/m ² or more,
The absorbent article, wherein the functional powder has a residual rate of 50% or more in a permeation/shedding test.

In the absorbent article of this embodiment, the amount of functional powder fixed to the sheet is greater than a certain level, and the functional powder is difficult to move from the sheet, so the function of the water-soluble functional powder is sufficiently achieved. can be demonstrated.

(Aspect 2)
The absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body located between these two sheets, and an intermediate sheet located between the top sheet and the absorbent body. , is equipped with
The absorbent body includes a skin-facing surface absorbent core located relatively on the skin-facing surface side in the thickness direction of the absorbent article, and a non-skin-facing surface side absorbent core located relatively on the non-skin facing surface side in the thickness direction. comprising a facing side absorbent core, and a core wrap sheet that wraps the skin facing side absorbent core and the non-skin facing side absorbent core,
The sheet to which the functional powder is fixed has a position in the thickness direction closer to the skin facing surface than the top sheet, a position between the top sheet and the intermediate sheet, and a position between the intermediate sheet and the core wrap. sheet, a position between the core wrap sheet and the skin-facing side absorbent core, and a position between the skin-facing side absorbent core and the non-skin-facing side absorbent core. The absorbent article according to aspect 1, characterized in that the absorbent article is disposed in at least one position of.

In the absorbent article of this embodiment, since the sheet on which the water-soluble functional powder is fixed is placed at the above-mentioned specific position, the functional powder is dissolved by the wearer's excretory fluid such as menstrual blood. Even if the dissolved functional powder (i.e., liquid functional agent) flows out from a predetermined location on the sheet, the dissolved functional powder (i.e., liquid functional agent) will migrate to the absorbent body or absorbent core located on the side that does not face the skin. By being retained there, it can once again perform its function as a functional agent. Therefore, the absorbent article of this embodiment can exhibit the functions of the water-soluble functional powder for a long period of time.

(Aspect 3)
The sheet to which the functional powder is fixed includes a fiber sheet,
The absorbent article according to

aspect

1 or 2, wherein the distance between fibers of the constituent fibers of the fiber sheet is 100 μm or less.

In the absorbent article of this embodiment, since the sheet to which the functional powder is fixed includes a fiber sheet having a specific inter-fiber distance, the functional powder is difficult to move between the constituent fibers of the fiber sheet. ing. Specifically, when the functional powder has a particle size of 100 μm or more, depending on the size relationship between the particle size of the functional powder and the distance between fibers of the constituent fibers of the fiber sheet, the functional powder has a particle size of 100 μm or more. Even when the functional powder is difficult to move between the constituent fibers of the sheet and has a particle size of less than 100 μm, the functional powder meanderes between the constituent fibers of the fiber sheet while colliding with the constituent fibers. As a result, it becomes difficult for the functional powder to move between the constituent fibers of the fiber sheet. Therefore, in the absorbent article of this embodiment, since the functional powder of a predetermined amount or more is more difficult to move from the sheet, the function of the water-soluble functional powder can be more reliably exhibited.

(Aspect 4)
The absorbent article according to aspect 3, wherein the functional powder has a volume median particle diameter (D50) of 50 μm or more.

In the absorbent article of this embodiment, since the inter-fiber distance of the constituent fibers of the fiber sheet and the volume median particle diameter of the functional powder are each within a specific range, the particle diameter of the functional powder and the composition of the fiber sheet are The relationship between the size of the fibers and the distance between them makes it even more difficult for the functional powder to move between the constituent fibers of the fiber sheet. Therefore, the absorbent article of this embodiment can more reliably exhibit the functions of the water-soluble functional powder.

(Aspect 5)
The sheet to which the functional powder is fixed includes a fiber sheet,
The absorbent article according to any one of aspects 1 to 4, wherein the functional powder is fixed to the fiber sheet with an adhesive.

In the absorbent article of this embodiment, since the water-soluble functional powder is fixed to the fiber sheet with an adhesive, the functional powder is difficult to fall off from the fiber sheet, and the constituent fibers of the fiber sheet are At least some of the constituent fibers are bonded and fixed to each other by an adhesive, so the distance between the constituent fibers of the fiber sheet is difficult to change, and the functional powder moves between the constituent fibers of the fiber sheet. It's getting harder to do. Thereby, the absorbent article of this embodiment can more reliably exhibit the functions of the water-soluble functional powder.

(Aspect 6)
The sheet to which the functional powder is fixed includes two sheet members that overlap in the thickness direction of the absorbent article,
The absorbent article according to any one of aspects 1 to 5, wherein the functional powder is sandwiched between the two sheet members.

In the absorbent article of this embodiment, since the water-soluble functional powder is sandwiched between the two sheet members, it becomes more difficult for the water-soluble functional powder to move from the sheet. Thereby, the absorbent article of this embodiment can more reliably exhibit the functions of the water-soluble functional powder.

(Aspect 7)
The sheet to which the functional powder is fixed has a joined part formed by joining the two sheet members, and a non-joined part defined as a part surrounded by the joined part in plan view. and
The absorbent article according to aspect 6, wherein the functional powder is disposed in the non-bonded portion.

In the absorbent article of this embodiment, the water-soluble functional powder is disposed between two sheet members in a closed space called a non-joined part surrounded by a joined part, so that the absorbent article has even higher functionality. Powder is difficult to move from the sheet. Thereby, the absorbent article of this embodiment can more accurately exhibit the functions of the water-soluble functional powder.

(Aspect 8)
The sheet to which the functional powder is fixed has a plurality of the non-bonded parts,
The absorbent article according to aspect 7, wherein the functional powder is dispersedly arranged in each of the plurality of non-bonded parts.

In the absorbent article of this embodiment, the water-soluble functional powder is distributed and arranged in each of the plurality of non-joined parts, so the functional powder can be arranged in a more precise position and difficult to move. I can do it. Thereby, the absorbent article of this embodiment can more accurately exhibit the functions of the water-soluble functional powder.

(Aspect 9)
The absorbent article has a longitudinal direction and a width direction in plan view,
The sheet to which the functional powder is fixed is arranged such that a plurality of the non-bonded portions are arranged in the longitudinal direction, and the bonded portions between adjacent non-bonded portions are arranged in the width direction. The absorbent article according to aspect 8, characterized in that the absorbent article is arranged to extend.

In the absorbent article of this embodiment, the plurality of non-bonded parts in which the water-soluble functional powder is arranged are arranged so as to be lined up in the longitudinal direction of the absorbent article, and the adjacent non-bonded parts Since the joint between the parts is arranged so as to extend in the width direction of the absorbent article, the water-soluble functional powder can be placed in an accurate position and difficult to move. Since the joint portion extending in the direction functions as a deformation guide portion (that is, functions as a base point for bending in the longitudinal direction), it is easy to deform to follow the shape of the wearer's body. Thereby, the absorbent article of this embodiment can exhibit the functions of the water-soluble functional powder even more accurately.

(Aspect 10)
The absorbent article according to any one of aspects 1 to 9, wherein the functional powder has a solubility of 8 g/100 g H ₂ O or more in 100 g of ion-exchanged water at 25°C.

In the absorbent article of this embodiment, the water-soluble functional powder has such a solubility that it is not completely dissolved in a small amount of excretory liquid (for example, the amount of excretion for one time). The body can perform its functions for a longer period of time.

According to the present invention, it is possible to provide an absorbent article that can fully exhibit the functions of water-soluble functional powder.

FIG. 1 is a schematic plan view of a sanitary napkin 1 according to an embodiment of the present invention in an unfolded state. FIG. 2 is a schematic cross-sectional view of the sanitary napkin 1. FIG. 3 is a schematic cross-sectional view of a sheet 7 used in the sanitary napkin 1, on which water-soluble functional powder is fixed. FIG. 4 is a schematic plan view illustrating variations in the arrangement of the bonded portions 73 and non-bonded portions 74 of the sheet 7 to which the water-soluble functional powder is fixed.

Hereinafter, preferred embodiments of the absorbent article of the present invention will be described in detail with reference to the drawings.

FIG. 1 is a schematic plan view of a sanitary napkin 1 in an unfolded state, which is an embodiment of the absorbent article of the present invention, and FIG. 2 is a schematic cross-sectional view of the sanitary napkin 1. In this specification, unless otherwise specified, "an object placed on a horizontal surface in an unfolded state (for example, an absorbent article, etc.) is ``Viewing in the thickness direction of the object from the surface sheet side'' is simply referred to as ``planar viewing.'' Furthermore, in the thickness direction of the absorbent article in the unfolded state, "the side that is relatively proximal to the wearer's skin surface when the absorbent article is worn" is referred to as the "skin-facing surface side," and the "absorbent When the article is worn, the "relatively distal side to the wearer's skin surface" is referred to as the "non-skin-facing surface side."

[Sanitary napkins]
As shown in FIG. 1, a sanitary napkin 1 that is an embodiment of the present invention has a longitudinal direction L and a width direction W in a plan view, and furthermore, two longitudinal edges extend in the longitudinal direction. Each has a vertically elongated outer shape projecting outward in an arc shape. Note that the external shape of the sanitary napkin 1 in a plan view is not limited to such an aspect, and any shape (for example, an elliptical shape, a rectangular shape, an hourglass shape, etc.) may be adopted depending on various uses and modes of use. can do.

As shown in FIG. 2, the sanitary napkin 1 includes, in the thickness direction T, a liquid-permeable top sheet 2 forming the skin-facing surface of the sanitary napkin 1, and a non-skin-facing surface of the sanitary napkin 1. The basic structure includes a back sheet 3 forming the front surface and an absorbent body 4 located between these two sheets. Furthermore, in this embodiment, the sanitary napkin 1 is located at both ends in the width direction W of the sanitary napkin 1 on the skin-facing surface side of the topsheet 2 and in the longitudinal direction. A pair of

side sheets

5, 5, which are arranged to extend in a direction L, and whose inner ends in the width direction W stand up to form a leakage barrier when the sanitary napkin 1 is worn, a top sheet 2, and an absorbent sheet. An intermediate sheet 6 located between the absorbent body 4 and having a function of diffusing excrement liquid that has passed through the top sheet 2 in the surface direction; and an intermediate sheet 6 located between the intermediate sheet 6 and the absorbent body 4 and having a water-soluble function. An adhesive part (non-adhesive part) is arranged on the sheet 7 to which the sexual powder is fixed and the non-skin facing surface of the back sheet 3, and is used to adhesively fix the sanitary napkin 1 to the inner surface of the wearer's clothing such as underwear. ).

In the present embodiment, the absorbent body 4 has a skin-facing side absorbent core 41 located relatively on the skin-facing side in the thickness direction T, and a skin-facing side absorbent core 41 located relatively on the non-skin-facing side in the thickness direction T. It has a non-skin facing side absorbent core 42 located at , and a core wrap sheet 43 that wraps these skin facing side absorbent core 41 and non-skin facing side absorbent core 42.

In the sanitary napkin 1, the sheet 7 on which the water-soluble functional powder is fixed has an amount of the functional powder fixed on the sheet 7 of 50 g/m2 ^or more, and the sheet 7 has a permeation-shedding test. This sheet satisfies the specific requirement that the residual rate of functional powder is 50% or more.

In this way, the water-soluble functional powder is adjusted so that the amount of the water-soluble functional powder fixed on the sheet 7 and the residual rate of the functional powder in the permeation/dropping test are each within the above-mentioned specific ranges. By fixing the body to the sheet 7, it is possible to make it difficult for the functional powder to move from the sheet 7 while ensuring an amount that allows the functional powder to fully perform its functions. Thereby, the sanitary napkin 1 of this embodiment can fully exhibit the function of the water-soluble functional powder.

In addition, in this specification, "water-soluble" means that the solubility (g/ _100gH2O ) in 100g of ion exchange water of 25 degreeC is 1g/100gH2O _or more.

Furthermore, the "amount of water-soluble functional powder fixed to the sheet" can be measured, for example, according to the following <Method for measuring the amount of functional powder fixed to the sheet>.

<Method for measuring the amount of functional powder fixed on the sheet>
(1) Peel off the top sheet etc. from the absorbent article and take out the sheet on which the functional powder is fixed.
(2) Cut out a square test piece of a predetermined size (for example, 50 mm x 50 mm) from the portion of the sheet taken out to which the functional powder is fixed. At this time, the size of the test piece is selected so that the largest square test piece can be cut out, depending on the size of the portion of the sheet to which the functional powder is fixed.
(3) Recover the functional powder from the cut out test piece using physical means (for example, vibration means, etc.) and/or chemical means (for example, a solvent capable of dissolving the adhesive). At this time, if foreign substances other than the functional powder (for example, fiber fragments, etc.) are present, remove the foreign substances using tweezers while using a magnifying observation means such as a microscope or a simple loupe. Collect only the powder.
(4) By measuring the mass (g) of the recovered functional powder and dividing it by the area (m ² ) of the above test piece in plan view, Obtain the body mass' (g/m ² ).

In addition, the "residual rate of functional powder in the permeation shedding test" of the sheet to which the functional powder is fixed can be measured according to the following <permeation shedding test>.

<Transmission drop test>
(1) Peel off the top sheet etc. from the absorbent article and take out the sheet on which the functional powder is fixed.
(2) Two square test pieces of a predetermined size (for example, 50 mm x 50 mm) are cut out from the portion of the sheet taken out to which the functional powder is fixed. At this time, the size of the test piece is selected so that the largest square test piece can be cut out, depending on the size of the portion of the sheet to which the functional powder is fixed. Note that the two test pieces are of the same size.
(3) From one of the two test pieces cut out, using physical means (for example, vibration means, etc.) and/or chemical means (for example, a solvent that can dissolve the adhesive, etc.) Collect functional powder. At this time, if foreign substances other than the functional powder (for example, fiber fragments, etc.) are present, remove the foreign substances using tweezers while using a magnifying observation means such as a microscope or a simple loupe. Collect only the powder.
(4) Measure the mass (g) of the recovered functional powder, and use this as the initial content (g) of the functional powder.
(5) Measure the mass (g) of the other of the two test pieces cut out in (2) above, and use this as the initial mass (g) of the test piece.
(6) Place the test piece whose initial mass was measured on a metal plate whose angle can be adjusted.
(7) The functional powder is dropped from the test piece by tilting the metal plate at an angle of 45°.
(8) Measure the mass (g) of the test piece after the functional powder has fallen off, and subtract this from the initial mass of the test piece to obtain the amount (g) of the functional powder that has fallen off.
(9) After obtaining the remaining amount (g) of the functional powder by subtracting the amount (g) of the obtained functional powder that fell off from the initial content (g) of the functional powder described above, By dividing this by the initial content (g) of the functional powder described above and multiplying by 100, the "residual rate of functional powder" (%) is obtained.

The sanitary napkin 1 of this embodiment is not limited to the above-mentioned structure as long as it includes a sheet to which water-soluble functional powder is fixed, and for example, a pair of

side sheets

5, 5 or an intermediate The seat 6 may not be provided.

Further, the arrangement position of the sheet 7 to which the water-soluble functional powder is fixed is not limited to the position shown in FIG. 2 as long as it is a position where the function of the functional powder can be exerted. However, in the thickness direction T, the sheet 7 to which the water-soluble functional powder is fixed is located at a position closer to the skin facing surface than the top sheet 2, at a position between the top sheet 2 and the intermediate sheet 6, and at a position on the intermediate sheet. 6 and the core wrap sheet 43, the position between the core wrap sheet 43 and the skin-facing side absorption core 41, and the position between the skin-facing side absorption core 41 and the non-skin-facing side absorption core 42. Preferably, it is located at at least one of the positions between. If the sheet 7 to which the water-soluble functional powder is fixed is placed at such a specific position, the functional powder will be dissolved by the wearer's excretory fluids such as menstrual blood, and the functional powder will be dissolved at the predetermined location of the sheet 7. Even if the functional powder (i.e., liquid functional agent) flows out from the absorbent core, the dissolved functional powder (i.e., liquid functional agent) will migrate to the absorbent body 4 and the absorbent core located on the non-skin facing side and be retained there. By doing so, the function as a functional agent can be exhibited again. Therefore, the sanitary napkin 1 in which the sheet 7 is arranged in such a specific position can exhibit the function of the water-soluble functional powder for a long period of time.

Hereinafter, the constituent members of the sanitary napkin 1 of this embodiment will be explained in more detail.

(Top sheet)
In the sanitary napkin 1, the top sheet 2 extends from one edge to the other edge in the longitudinal direction L of the sanitary napkin 1 in plan view, and The napkin 1 has a vertically elongated outer shape extending from near one edge to near the other edge in the width direction W of the napkin 1 . As shown in FIG. 2, the top sheet 2 is disposed at a position on the skin-facing surface side of the sanitary napkin 1 in the thickness direction T, and is located on the contact surface that can come into contact with the wearer's skin, that is, on the sanitary napkin 1. It is constituted by a liquid-permeable sheet-like member (for example, a nonwoven fabric such as an air-through nonwoven fabric) that forms the surface on the skin-facing side.

The top sheet 2 has slightly larger dimensions in the longitudinal direction L and the width direction W than the absorber 4 in plan view, and is joined to the back sheet 3 located on the non-skin facing side at the peripheral edge. .

Note that the external shape, various dimensions, basis weight, etc. of the top sheet 2 are not particularly limited, and any shape, various dimensions, basis weight, etc. may be adopted depending on the desired liquid permeability, texture, flexibility, strength, etc. be able to.

(back sheet)
In the sanitary napkin 1, the back sheet 3 extends from one side edge in the longitudinal direction L of the sanitary napkin 1 to the other side edge in the width direction W of the sanitary napkin 1 in plan view. It has a vertically elongated external shape extending from one side edge to the other side edge. As shown in FIG. 2, the back sheet 3 is arranged at a position on the non-skin facing surface side in the thickness direction T of the sanitary napkin 1, and forms the non-skin facing surface of the sanitary napkin 1, and also has an absorbent property. It is made of a liquid-impermeable sheet-like member (for example, a resin film, an SMS nonwoven fabric, etc.) that prevents excretory fluids such as menstrual blood that have passed through the body 4 from leaking to the outside of the sanitary napkin 1.

Note that the outer shape, various dimensions, basis weight, etc. of the back sheet 3 are not particularly limited, and any shape, various dimensions, basis weight, etc. can be adopted depending on the desired leak-proof performance, breathability, strength, etc. can.

(Absorber)
In the sanitary napkin 1, as shown in FIG. It extends over a wide area in the longitudinal direction L from near the edge to near the other side edge, and also extends over a wide area in the width direction W from near one side edge to the other side edge. Furthermore, it has a vertically elongated external shape in which two longitudinal edges each protrude outward in the longitudinal direction in an arc shape. In addition, as shown in FIG. 1, the absorbent body 4 has a constricted portion in the center portion in the longitudinal direction L when viewed from above, the length of which is relatively small in the width direction compared to other portions. The absorbent body 4 has a minimum width portion having a minimum width at this constriction portion, and a maximum width portion having a maximum width of the absorbent body 4 on the longitudinally outward side of the constriction portion.

The absorbent body 4 is disposed between the top sheet 2 and the back sheet 3 in the thickness direction T of the sanitary napkin 1, and can absorb and retain excretory fluids such as menstrual blood that have passed through the top sheet 2. , is formed of a predetermined water-absorbing member. More specifically, as shown in FIG. 2, the absorbent body 4 includes a skin-facing surface-side absorbent core 41 located relatively on the skin-facing surface side in the thickness direction T and made of a water-absorbing material, and A non-skin facing absorbent core 42 that is relatively located on the non-skin facing side in direction T and is made of a water-absorbing material, and a core that wraps around the skin facing absorbent core 41 and the non-skin facing absorbent core 42. Wrap sheet 43.

Note that the absorbent body 4 is not limited to such a configuration, and may include a single absorbent core or may have two or more absorbent cores.

In this embodiment, the skin-facing side absorbent core 41 and the non-skin-facing side absorbent core 42 can be formed from a water-absorbing material known in the art. Examples of such water-absorbing materials include hydrophilic fibers and superabsorbent polymers.

Specific examples of hydrophilic fibers include pulp fibers (for example, pulverized pulp, etc.), cellulose fibers such as cotton, rayon, and acetate. On the other hand, examples of superabsorbent polymers include powders or granules made of superabsorbent polymers such as sodium acrylate copolymers known in the art, so-called SAP (Super Absorbent Polymer). Specific examples of superabsorbent polymers include polymers or copolymers of (meth)acrylic acid or alkali metal salts of (meth)acrylate, preferably polymers or copolymers of sodium (meth)acrylate. Examples include polymers. In this specification, (meth)acrylic acid means acrylic acid or methacrylic acid.

Note that even if the skin-facing side absorbent core 41 and the non-skin-facing side absorbent core 42 contain only either hydrophilic fibers or superabsorbent polymers, they may be made of hydrophilic fibers and superabsorbent polymers. It may include both. Further, the skin-facing side absorbent core 41 and the non-skin-facing side absorbent core 42 may be configured with the same composition or may be configured with different compositions.

In this embodiment, the core wrap sheet 43 can be formed from a hydrophilic fiber sheet known in the art. Examples of such a hydrophilic fiber sheet include tissue having a basis weight of about 10.0 g/m ² to 20.0 g/m ² and formed using bleached softwood kraft pulp as a main raw material.

Note that the external shape, various dimensions, basis weight, etc. of the absorbent body 4 are not particularly limited, and any shape, various dimensions, basis weight, etc. can be adopted depending on the desired water absorbency, flexibility, strength, etc. .

(intermediate sheet)
In the sanitary napkin 1, the intermediate sheet 6 extends from near one edge in the longitudinal direction L of the sanitary napkin 1 to near the other edge in the longitudinal direction L, and is wider than the top sheet 2 in the width direction. It has a vertically long outer shape with a small W length. As shown in FIG. 2, the intermediate sheet 6 is disposed at a position on the non-skin-facing surface side of the top sheet 2 in the thickness direction T of the sanitary napkin 1 to prevent menstrual blood etc. that have passed through the top sheet 2. A sheet-like member (for example, a nonwoven fabric such as an air-through nonwoven fabric) having a predetermined liquid diffusibility and liquid permeability for transferring excreted liquid to the absorbent body 4 located on the non-skin facing side while diffusing it in the surface direction. It is made up of.

Note that the external shape, various dimensions, basis weight, etc. of the intermediate sheet 6 are not particularly limited, and any shape, various dimensions, basis weight, etc. can be adopted depending on desired liquid diffusivity, liquid permeability, etc. .

(side seat)
In the sanitary napkin 1, the pair of

side sheets

5, 5, as shown in FIG. It has a shape. The pair of

side sheets

5, 5 are arranged at both ends of the sanitary napkin 1 in the width direction W at positions on the skin-facing surface side of the top sheet 2, and the outer ends in the width direction W are connected to the back sheet 3. The inner end in the width direction W is not joined to any component such as the top sheet 2 and is a free end. is formed. Each of the pair of

side sheets

5, 5 is deformed so that the sanitary napkin 1 is curved in the longitudinal direction L when worn, so that the inner end in the width direction W, which is a free end, stands up. A hydrophilic or hydrophobic sheet-like member (e.g. , hydrophilic or hydrophobic nonwoven fabric, resin film, etc.).

Further, the external shape, various dimensions, basis weight, etc. of each of the pair of

side sheets

5, 5 are not particularly limited, and any shape, various dimensions, basis weight, etc. may be adopted according to the desired leakage prevention performance, etc. I can do it.

(Sheet to which water-soluble functional powder is fixed)
In the sanitary napkin 1, the sheet 7 to which the water-soluble functional powder is fixed extends from near one edge in the longitudinal direction L of the sanitary napkin 1 to near the other edge in the longitudinal direction L. , and has a vertically elongated external shape extending from the vicinity of one side edge to the vicinity of the other side edge in the width direction W of the sanitary napkin 1 . As shown in FIG. 2, this sheet 7 is arranged at a position between the intermediate sheet 6 and the absorbent body 4 in the thickness direction T of the sanitary napkin 1, and the sheet 7 is arranged at a position between the intermediate sheet 6 and the absorbent body 4 in the thickness direction T of the sanitary napkin 1. It is composed of a water-soluble functional powder that has a predetermined function such as reforming the excretory fluid when it comes into contact with the excretory fluid such as blood, and a sheet member to which the functional powder is fixed. There is.

Here, FIG. 3 is a schematic cross-sectional view of the sheet 7 used in the sanitary napkin 1 and on which the water-soluble functional powder _PF is fixed. As shown in FIG. 7, the sheet 7 on which the water-soluble functional powder P _F is fixed is in a form in which the water-soluble functional powder P _F is sandwiched between two

sheet members

71 and 72. Furthermore, the water-soluble functional powder _PF and two

sheet members

71 and 72 are bonded to each other using a hot-melt adhesive _HM .

In addition, in the sheet 7, the fixing means and fixing form of the water-soluble functional powder are not particularly limited, and the functional powder can be fixed between at least two sheet members via an adhesive or It may be held without an adhesive, or it may be held on one or both sides of a single sheet member by any fixing means (for example, structural means such as holding it in a fine uneven structure on the surface of the sheet member, etc.) (adhesive means such as adhesive, fusion means such as ultrasonic waves, etc.), or may be fixed so as to be held inside one sheet member.

Here, in this specification, "the functional powder is fixed to the sheet" means that the functional powder is fixed to the sheet to such an extent that the residual rate of the functional powder in the above-mentioned permeation and shedding test is 50% or more. Means the state held by a member.

(sheet member)
Although the

sheet members

71 and 72 are not particularly limited, they are preferably liquid-permeable sheet members. Examples of such liquid-permeable sheet members include fiber sheets and porous resin films, but fiber sheets are preferred from the viewpoint of ease of fixing functional powders, liquid permeability, flexibility, etc. It is preferable to use

Specific examples of the fiber sheet include nonwoven fabrics (e.g., air-through nonwoven fabrics, spunbond nonwoven fabrics, SMS nonwoven fabrics, spunlace nonwoven fabrics, airlaid pulp nonwoven fabrics, etc.), tissues, woven fabrics, knitted fabrics, and the like. Such a fiber sheet may have a single layer structure or a multilayer structure of two or more layers. The type of fibers constituting the fiber sheet is not particularly limited, and examples thereof include hydrophilic fibers such as cellulose fibers and thermoplastic resin fibers subjected to hydrophilic treatment. These fibers may be used alone or in combination of two or more types.

In the present embodiment, the sheet 7 to which the water-soluble functional powder P _F is fixed includes the fiber sheet as described above, and the distance between the constituent fibers of the fiber sheet is 100 μm or less. preferable. If the sheet 7 to which the functional powder P _F is fixed includes a fiber sheet having such a specific inter-fiber distance, the functional powder P _F will be difficult to move between the constituent fibers of the fiber sheet. Become. Specifically, when the functional powder _PF has a particle size of 100 μm or more, _the functionality is Even if the powder P _F is difficult to move between the constituent fibers of the fiber sheet, and even if the functional powder P _F has a particle size of less than 100 μm, the functional powder P _F will not easily move between the constituent fibers of the fiber sheet. The functional powder PF has no choice but to move in a meandering manner while colliding with the constituent fibers, and as a result, it becomes difficult for the functional powder _PF to move between the constituent fibers of the fiber sheet. Therefore, in the sheet 7 including the fiber sheet having such a specific fiber-to-fiber distance, it becomes difficult for more than a predetermined amount of the functional powder _PF to move from the sheet 7. The function of _PF can be more reliably demonstrated.

Note that the lower limit of the distance between the fibers constituting the fiber sheet is not particularly limited, but from the viewpoint of liquid permeability, flexibility, etc., the distance between the fibers constituting the fiber sheet is preferably 10 μm or more.

Here, the "interfiber distance of the constituent fibers of the fiber sheet" can be measured according to the following <Method for measuring interfiber distance>.

<Method for measuring interfiber distance>
(1) Using a microscope manufactured by Keyence Corporation, a 3D composite image is created at a depth of 40 μm from the outermost surface of the fiber sheet (for example, nonwoven fabric, etc.) to be measured.
(2) Extract the fiber surface that is in focus in the 3D composite image and measure the diameter (μm) of the inscribed circle of the gap between the fibers.
(3) The diameter of the inscribed circle of the gap between the fibers is measured at 30 locations (n=30), and the average value is calculated and used as the inter-fiber distance (μm).

Note that the external shape, various dimensions, basis weight, etc. of the sheet member (for example, a fiber sheet) that can be used for the sheet to which the functional powder is fixed are not particularly limited as long as they do not impede the effects of the present invention, and the desired liquid Any shape, various dimensions, basis weight, etc. can be adopted depending on permeability, flexibility, etc. For example, when using the above-mentioned fiber sheet as a sheet member, the basis weight may be within the range of 5 g/m ² to 80 g/m ² , and the fiber diameter of the constituent fibers may be within the range of 5 μm to 60 μm. Examples of the fiber diameter include a thickness within a range of 50 μm to 1500 μm.

(Functional powder)
In this embodiment, the functional powder is not particularly limited as long as it is a water-soluble powdery functional agent, and any powdery functional agent can be used depending on the desired additional function or action. can. Examples of such functional agents include blood modifiers (e.g., osmotic pressure regulators, etc.), fragrances, warming agents, cooling agents, exothermic agents, antibacterial agents, pH adjusters, skin care agents, and deodorants. Examples include. These functional agents may be used alone or in combination of two or more types.

In addition, in the sanitary napkin 1 of the present embodiment, a powdery material is used as the water-soluble functional powder, since the absorption performance can be improved by making it difficult to cause rewetting of excreted fluid such as menstrual blood. It is preferred to use blood modifiers, especially osmotic pressure regulators.

Osmotic pressure regulators have an osmotic pressure regulating effect of regulating the osmotic pressure of blood cell components (blood cells such as red blood cells, white blood cells, platelets, etc.) in the blood, and are, for example, called osmolytes. Chemical substances include neutral zwitterions (e.g., glycine, serine, betaine, etc.), sugars (e.g., glucose, fructose, galactose, mannose, xylose, erythrose, sucrose, etc.), polyvalent Examples include alcohols (eg, sorbitol, mannitol, xylitol, erythritol, inositol, etc.), methylammoniums, sulfoniums, cyclic carboxylic acid esters (eg, glucuronolactone, etc.).

In the present embodiment, the functional powder preferably has a solubility of 8 g/100 g H ₂ O or more in 100 g of ion-exchanged water at 25°C. Such functional powders have solubility that they are not completely dissolved in a small amount of excretory fluid (for example, the amount of excrement in one dose), so they can maintain their functions for a longer period of time. can be demonstrated over a period of time.

Examples of functional powders having such solubility include taurine, betaine, serine, glycine, glycylglycine, tricine, glucose, fructose, galactose, mannose, xylose, erythrose, sorbitol, mannitol, xylitol, and erythritol. Examples include osmotic pressure regulators such as.

The solubility of the functional powder in 100 g of ion-exchanged water at 25° C. is more preferably 10 g/100 g or more, and even more preferably 25 g/100 g or more. Further, the solubility of the functional powder in 100 g of ion-exchanged water at 25° C. is more preferably 72 g/100 g or less, and even more preferably 36 g/100 g or less.

When the sheet to which the water-soluble functional powder is fixed includes a fiber sheet in which the distance between the constituent fibers is 100 μm or less as described above, the functional powder has a volume median particle diameter ( It is preferable to use a material having a D50) of 50 μm or more. When the inter-fiber distance of the constituent fibers of the fiber sheet and the volume median particle diameter of the functional powder are each within such specific ranges, the particle diameter of the functional powder and the inter-fiber distance of the constituent fibers of the fiber sheet are This size relationship makes it even more difficult for the functional powder to move between the constituent fibers of the fiber sheet, so the function of the water-soluble functional powder can be more reliably exerted.

Note that the upper limit of the volume-median particle size of the functional powder is not particularly limited, but may be, for example, a particle size of 1500 μm or less.

<Method for measuring volume median particle diameter of functional powder>
Here, the volume median particle diameter (D50) of the functional powder is measured using a laser diffraction/scattering particle size distribution analyzer (manufactured by Horiba, Ltd., LA-960). It can be measured as the median diameter of

In the present embodiment, the means and form of fixing the water-soluble functional powder to the sheet member is not particularly limited as described above, but the functional powder P _F is bonded to the adhesive H as shown in FIG. It is preferable that it is fixed to the fiber sheet (

sheet members

71 and 72 in FIG. 3) by _M. When the functional powder P _F is fixed to the fiber sheet by the adhesive H _M , the functional powder P _F is difficult to fall off from the fiber sheet, and at least a part of the constituent fibers of the fiber sheet are bonded to the adhesive H M. By bonding and fixing the constituent fibers with each other by _HM , the distance between the constituent fibers of the fiber sheet becomes difficult to change, or the adhesive _HM closes at least part of the gap between the constituent fibers of the fiber sheet. By arranging the fibers so as to close them, the gaps between the constituent fibers of the fiber sheet become smaller, making it difficult for the functional powder _PF to move between the constituent fibers of the fiber sheet. Thereby, the function of the functional powder _PF can be more reliably exhibited.

Note that the coating form of the adhesive on the fiber sheet is not particularly limited, and any coating form such as curtain coating or spiral coating may be adopted. Further, the amount of adhesive applied to the fiber sheet is not particularly limited, and any amount of adhesive applied depending on the desired liquid permeability etc. can be adopted, for example, 1 g/m ² to 20 g/m ² The coating amount is mentioned.

Further, the sheet 7 to which the functional powder is fixed includes two

sheet members

71 and 72 that overlap in the thickness direction T of the sanitary napkin 1, as shown in FIG. It is preferable that _F is sandwiched between these two

sheet members

71 and 72. If the functional powder P _F _is sandwiched between such two

sheet members

71 and 72, it becomes even more difficult for the functional powder P _F to move from the sheet 7. functions can be demonstrated more reliably.

Furthermore, in this embodiment, the sheet 7 to which the functional powder P _F is fixed has a joint 73 formed by joining two

sheet members

71 and 72, as shown in FIG. 4(a). The non-bonded portion 74 is defined as a portion surrounded by the bonded portion 73 in plan view, and the functional powder _PF is disposed in the non-bonded portion 74. In this way, when the water-soluble functional powder P _F is arranged in the closed space of the non-joint part 74 surrounded by the joint part 73 between the two

sheet members

71 and 72, it becomes even more effective. Since the functional powder _PF becomes difficult to move from the sheet 7, the function of the water-soluble functional powder _PF can be more accurately exhibited.

Note that the arrangement of the bonded portions 73 and non-bonded portions 74 in the sheet 7 to which the functional powder _PF is fixed is not limited to that of this embodiment (that is, the arrangement shown in FIG. 4(a)). Here, FIG. 4 is a schematic plan view illustrating variations in the arrangement of the bonded portions 73 and non-bonded portions 74 of the sheet 7 to which the water-soluble functional powder _PF is fixed.

Specifically, in the arrangement shown in FIG. 4(a), a substantially rectangular non-joined portion 74 that is long in the longitudinal direction of the sheet 7 is arranged so as to extend in the longitudinal direction at the center of the sheet 7 in the width direction. There is. On the other hand, the joint part 73 is arranged so as to surround the non-joint part 74.

In addition, in the arrangement shown in FIG. 4(b), four substantially rectangular non-joined portions 74 that are long in the width direction of the sheet 7 are spaced at a predetermined interval in the longitudinal direction at the center of the sheet 7 in the width direction. They are arranged side by side. On the other hand, the joint parts 73 are arranged so as to surround the entire four non-joint parts 74, and extend in the width direction of the sheet 7 between the non-joint parts 74 adjacent to each other in the longitudinal direction of the sheet 7. It is located in

Furthermore, in the arrangement shown in FIG. 4(c), the eight substantially rectangular non-joining parts 74 are arranged at predetermined intervals in the longitudinal direction and the width direction at the center of the sheet 7 in the width direction. (Two rows are arranged at a predetermined interval in the width direction, with one row of four non-joint parts 74 arranged in the longitudinal direction). On the other hand, the joint parts 73 are arranged so as to surround all eight non-joint parts 74, and extend in the width direction of the sheet 7 between the non-joint parts 74 adjacent to each other in the longitudinal direction of the sheet 7. The non-joining portions 74 are arranged to extend in the longitudinal direction of the sheet 7 between adjacent non-joined portions 74 in the width direction of the sheet 7 .

In the arrangement shown in FIG. 4(d), the 12 substantially rectangular non-joined parts 74 that are long in the longitudinal direction of the sheet 7 are arranged at predetermined positions in the longitudinal direction and the width direction at the center of the sheet 7 in the width direction. They are arranged so as to be spaced apart from each other (with one row of four non-bonded parts 74 arranged in the longitudinal direction, three rows are arranged at predetermined intervals in the width direction). On the other hand, the joint parts 73 are arranged so as to surround the entire 12 non-joint parts 74, and extend in the width direction of the sheet 7 between the non-joint parts 74 adjacent to each other in the longitudinal direction of the sheet 7. The non-joining portions 74 are arranged to extend in the longitudinal direction of the sheet 7 between adjacent non-joined portions 74 in the width direction of the sheet 7 .

Note that in the arrangement form shown in FIGS. 4(a) to 4(d), the sheet 7 is arranged within the sanitary napkin 1 such that the longitudinal direction of the sheet 7 corresponds to the longitudinal direction L of the sanitary napkin 1. This layout assumes that

The sheet 7 to which the functional powder P _F is fixed has a plurality of non-bonded parts 74 as shown in the arrangement form shown in FIGS. 4(b) to (d), and the functional powder P _F is It is preferable that they are distributed and arranged in each of the plurality of non-bonded parts 74. When the water-soluble functional powder P _F is dispersed and arranged in each of the plurality of non-bonded parts 74, the functional powder P _F can be arranged in a more precise position and difficult to move. Therefore, the functions of the functional powder _PF can be exhibited more accurately.

Furthermore, the sheet 7 to which the functional powder P _F is fixed is arranged such that a plurality of non-bonded parts 74 are lined up in the longitudinal direction L of the sanitary napkin 1, and between the adjacent non-bonded parts 74. It is particularly preferable that the joint portion 73 is arranged so as to extend in the width direction W of the sanitary napkin 1. A plurality of non-bonded parts 74 in which the functional powder P _F is arranged are arranged so as to be lined up in the longitudinal direction L of the sanitary napkin 1, and the joined parts 73 between adjacent non-bonded parts 74 are When arranged so as to extend in the width direction W of the sanitary napkin 1, the functional powder _PF can be placed in an accurate position and difficult to move, and also extends in the width direction W of the sanitary napkin 1. Since the joint portion 73 functions as a deformation guide portion (that is, functions as a bending point in the longitudinal direction L), the sanitary napkin 1 can easily deform to follow the shape of the wearer's body. Thereby, the sanitary napkin 1 can exhibit the functions of the functional powder _PF even more accurately.

In particular, a plurality of joints 73 extending in the width direction W of the sanitary napkin 1 are arranged at predetermined intervals in the longitudinal direction L of the sanitary napkin 1, as shown in the arrangement form shown in FIGS. 4(b) to 4(d). It is preferable that the sanitary napkin 1 be arranged side by side, and furthermore, as in the arrangement shown in FIGS. More preferred. If the joint portion 73 that can function as a deformation guiding portion is arranged in this way, the sanitary napkin 1 will more easily deform to follow the wearer's body shape more accurately, and in particular, even during the wearer's movements. Since the sanitary napkin 1 can be precisely fitted to the wearer's body, the functions of the functional powder _PF can be more accurately demonstrated, and the feeling of wearing and leak-proofing properties are also improved. can be done.

The absorbent article of the present invention is not limited to the sanitary napkins of the above-described embodiments, but can be applied to various absorbent articles such as panty liners, absorbent pads, and disposable diapers.

Furthermore, the present invention is not limited to the above-described embodiments or the following examples, and can be appropriately combined, substituted, and changed within the scope of the purpose and gist of the present invention.

Hereinafter, the present invention will be explained in more detail with reference to Examples and Comparative Examples, but the present invention is not limited only to these Examples.

Example 1
Air-through nonwoven fabric-1 (hereinafter referred to as "AT-1") shown in Table 1 below was cut into a square shape of 50 mm x 50 mm to produce a sheet member. Next, as a water-soluble functional powder, 0.20 g of glycine (Gly-large particle size; G-1) with a large particle size shown in Table 2 was weighed out and uniformly spread on a sheet member using an acrylic ring with an inner diameter of 25 mm. (coating amount equivalent to 101.9 g/m ² ) to produce the sheet of Example 1 on which the functional powder was fixed.

Example 2
The same procedure as in Example 1 was carried out, except that before applying the functional powder to the sheet member, a hot melt adhesive was applied to the sheet member by spiral spray at a coating amount of 5 g/ ^m2 . A sheet of Example 2 was produced.

Example 3
In the same manner as in Example 1, except that before coating the functional powder on the sheet member, a hot melt adhesive was applied to the sheet member by curtain spray at a coating amount of 5 g/ ^m2 , A sheet according to Example 3 was produced.

Example 4
After producing two sheet members and coating the functional powder on the sheet member, another sheet member (i.e., AT-1 shown in Table 1 below) was coated on top of the functional powder in a size of 50 mm× A sheet of Example 4 was produced in the same manner as Example 1, except that the functional powder was sandwiched between two sheet members by stacking the sheets (cut into a 50 mm square shape).

Examples 5 to 97 and Comparative Examples 1 to 15
Examples 5 to 97 and comparison were carried out in the same manner as Examples 1 to 4 above, except that the type of sheet member and the type of functional powder were changed to those shown in Tables 1 to 5 below. Sheets of Examples 1-15 were produced.

For each of the sheets of Examples 1 to 97 and Comparative Examples 1 to 15 produced as described above, a permeation and shedding test was conducted according to (5) to (9) of <Permeation and shedding test> above, and the functionality of each sheet was determined. The residual rate of powder was measured. In addition, in measuring the residual rate, 0.20 g was adopted as the initial content (g) of the functional powder.

The results of the residual rate of functional powder of each sheet of Examples 1 to 97 and Comparative Examples 1 to 15 are shown in Tables 3 to 5 below. In addition, in Tables 3 to 5 below, "N" in the adhesive coating form means that the adhesive was not applied to the sheet member, and "SP" means that the adhesive was not applied to the sheet member. ``CT'' means that a hot melt type adhesive was applied by spiral spray to the sheet member at a coating amount of 5 g/ ^m2 , and "CT" means that a sheet member was coated with a hot melt type adhesive by curtain spraying at a coating amount of 5 g/ ^m2 . It means that it has been coated.

As shown in Tables 3 to 5, in each embodiment of the present invention, the type of sheet member, the distance between fibers, the particle size of the functional powder, etc. can be selected, or the adhesive can be applied to the sheet member. A sheet with a residual rate of functional powder of 50% or more could be obtained by processing or sandwiching the functional powder between two sheet members. In addition, when the particle size of the functional powder is large, the residual rate of the functional powder in the sheet tends to be low, but it is possible to It has been found that the residual rate of the functional powder can be improved by sandwiching it between sheet members. Furthermore, when the distance between the fibers of the sheet member is large, the residual rate of functional powder in the sheet tends to be low, but by selecting functional powder with a large particle size, the residual rate of functional powder can be reduced. It was found that the rate could be improved.

From the above, the sheets of each example of the present invention have water-soluble functionality because the amount of functional powder fixed to the sheet is above a certain level and the functional powder is difficult to move from the sheet. It is thought that the functions of the powder can be fully demonstrated.

1 Sanitary napkin 2 Top sheet 3 Back sheet 4 Absorbent body 41 Absorbent core on the skin-facing side 42 Absorbent core on the non-skin-facing side 43 Core wrap sheet 5 Side sheet 6 Intermediate sheet 7 Water-soluble functional powder is fixed Sheet 71 Sheet member 72 Sheet member 73 Joint part 74 Non-joint part H _M adhesive P _F water-soluble functional powder

Claims

An absorbent article comprising a sheet to which a water-soluble functional powder is fixed,
The amount of the functional powder fixed to the sheet is 50 g/m 2 or more,
The absorbent article, wherein the functional powder has a residual rate of 50% or more in a permeation/shedding test.
The absorbent article includes a liquid-permeable top sheet, a liquid-impermeable back sheet, an absorbent body located between these two sheets, and an intermediate sheet located between the top sheet and the absorbent body. , is equipped with
The absorbent body includes a skin-facing surface absorbent core located relatively on the skin-facing surface side in the thickness direction of the absorbent article, and a non-skin-facing surface side absorbent core located relatively on the non-skin facing surface side in the thickness direction. comprising a facing side absorbent core, and a core wrap sheet that wraps the skin facing side absorbent core and the non-skin facing side absorbent core,
The sheet to which the functional powder is fixed has a position in the thickness direction closer to the skin facing surface than the top sheet, a position between the top sheet and the intermediate sheet, and a position between the intermediate sheet and the core wrap. sheet, a position between the core wrap sheet and the skin-facing side absorbent core, and a position between the skin-facing side absorbent core and the non-skin-facing side absorbent core. The absorbent article according to claim 1, characterized in that the absorbent article is located at at least one position of.
The sheet to which the functional powder is fixed includes a fiber sheet,
The absorbent article according to claim 1 or 2, wherein the distance between the constituent fibers of the fiber sheet is 100 μm or less.
The absorbent article according to claim 3, wherein the functional powder has a volume median particle diameter (D50) of 50 μm or more.
The sheet to which the functional powder is fixed includes a fiber sheet,
The absorbent article according to any one of claims 1 to 4, wherein the functional powder is fixed to the fiber sheet with an adhesive.
The sheet to which the functional powder is fixed includes two sheet members that overlap in the thickness direction of the absorbent article,
The absorbent article according to any one of claims 1 to 5, wherein the functional powder is sandwiched between the two sheet members.
The sheet to which the functional powder is fixed has a joined part formed by joining the two sheet members, and a non-joined part defined as a part surrounded by the joined part in plan view. and
The absorbent article according to claim 6, wherein the functional powder is arranged in the non-bonded portion.
The sheet to which the functional powder is fixed has a plurality of the non-bonded parts,
The absorbent article according to claim 7, wherein the functional powder is distributed and arranged in each of the plurality of non-bonded parts.
The absorbent article has a longitudinal direction and a width direction in plan view,
The sheet to which the functional powder is fixed is arranged such that a plurality of the non-bonded portions are arranged in the longitudinal direction, and the bonded portions between adjacent non-bonded portions are arranged in the width direction. The absorbent article according to claim 8, characterized in that it is arranged in an elongated manner.
The absorbent article according to any one of claims 1 to 9, wherein the functional powder has a solubility of 8 g/100 g H 2 O or more in 100 g of ion-exchanged water at 25°C.