JP7454447B2 - absorbent articles - Google Patents

Description

The present invention relates to absorbent articles.

Generally, absorbent articles are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet. body fluids are absorbed into the absorbent body through the top sheet. There are various types of these absorbent articles depending on the purpose, such as tape-type disposable diapers, pants-type disposable diapers, urine absorbing pads, and light incontinence pads, regardless of whether they are for adults or infants. .

Absorbent articles have a functional property of absorbing and retaining body fluids such as urine and loose stools, so there is a problem in that body fluid odor spreads to the wearer and his/her surroundings or adheres to the wearer's clothing. In particular, from the perspective of reducing the burden of nursing care, efforts are being made to absorb body fluids multiple times with a single absorbent article by increasing the size of absorbent articles (or absorbers) and improving the absorbent body's ability to absorb body fluids. At present, this problem is becoming more and more obvious.

Patent Document 1 includes a top sheet, a back sheet, and an absorbent body disposed between these, and contains an aromatic substance such as a liquid fragrance inside the absorbent body, for the purpose of informing people when it is time to change a disposable diaper. Disclosed is a paper diaper in which an airtight water-soluble container is inserted, in which a PVA film is encapsulated. The patent document describes how, as the wearer of the disposable diaper discharges body fluids, the container is dissolved by the water content of the body fluids and a fragrance is emitted. It is stated that it is possible to know.

Utility Model Publication No. 63-100021

However, in Patent Document 1, since the container containing the liquid fragrance is directly inserted into the absorbent body, the protection of the container is insufficient, and the external force applied when handling it for wearing, etc. If the container ruptures before use due to friction with clothing, etc., and the liquid fragrance leaks to the outside, or if the water-soluble film that makes up the container melts, the liquid fragrance will not remain in the absorbent and may cause damage to the skin. There is a risk that the odor may flow to the side and adhere to the wearer's skin, making the odor masking effect of body fluids insufficient.

It is an object of the present invention to provide an absorbent article that does not release masking agents such as fragrances before absorption of body fluids, releases an appropriate amount of fragrances continuously after absorption of body fluids, and can effectively suppress body fluid odors. purpose.

In order to solve the above problems, the present inventors have conducted intensive research and found that instead of enclosing liquid fragrances as they are in water-soluble containers as in the conventional technology, masking agents for liquid fragrances etc. At the same time, the masking agent-containing pouch (hereinafter also referred to as "deodorizing pouch") is impregnated into a water-absorbent article and sealed in a pouch made of a water-soluble resin film. The present inventors have discovered that a desired absorbent article can be obtained by enclosing the absorbent body and covering it with a body fluid-absorbing pouch that is significantly smaller than the absorbent body, and have completed the present invention. That is, the present invention relates to the following absorbent article.

(1) An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable and breathable backsheet, and an absorbent body disposed between the topsheet and the backsheet,
Between the layers of the absorbent body and the backsheet,
further comprising: a deodorizing pouch relatively disposed on the backsheet side; and a body fluid absorbing pouch relatively disposed on the absorbent body side and covering the deodorant pouch;
The deodorizing pouch is a bag made of a water-soluble resin film, and a paper base material impregnated with a liquid masking agent to a saturated state is enclosed in the bag.
The body fluid-absorbing pouch includes a bag main body made of a hydrophilic nonwoven fabric and a superabsorbent polymer encapsulated inside the bag main body, and has a length of 30 mm or more and 110 mm or less, and a width of 9 mm or more and 20 mm. An absorbent article that is:
(2) The above (2) further includes an adhesive layer provided on a non-skin side surface of the backsheet, the adhesive layer being disposed in a region that does not overlap with the deodorant pouch and the body fluid absorbing pouch in the thickness direction. 1) Absorbent article.
(3) The absorbent article according to (1) or (2) above, wherein the deodorant pouch and the body fluid absorption pouch each have a flat shape, and the body fluid absorption pouch is larger than the deodorant pouch. .
(4) The absorbent article according to any one of (1) to (3) above, wherein the water-soluble resin is polyvinyl alcohol.
(5) The absorbent article according to any one of (1) to (4) above, wherein the liquid masking agent is a liquid fragrance.

According to the present invention, an absorbent article is provided in which a masking agent such as fragrance is not released before absorption of body fluid, and an appropriate amount of fragrance is continuously released after absorption of body fluid, and which can effectively suppress body fluid odor. .

1 is a plan view schematically showing the configuration of an absorbent article according to a first embodiment of the present invention. 2 is a schematic cross-sectional view in the width direction taken along the line X ₁ -X ₁ shown in FIG. 1. FIG. FIG. 1 is a schematic plan view showing an enlarged configuration of main parts of an absorbent article according to a first embodiment. FIG. 2 is a plan view schematically showing the configuration of a body fluid absorption pouch.

In this specification, wearing an absorbent article refers to a state in which the absorbent article is worn on the body, regardless of whether before or after absorbing body fluids. In an absorbent article, the longitudinal direction is the direction indicated by Y in the figure, extending from the front and back of the wearer's crotch area when the absorbent article is worn on the body, and the width direction is the direction relative to the longitudinal direction. This is the direction indicated by X in the figure, which is perpendicular to the direction shown in FIG. The skin side refers to the surface that comes into contact with the wearer's skin and the surface that faces the skin when the absorbent article 1 is worn, and the non-skin side refers to the surface that comes into contact with the wearer's clothing or the surface that faces the wearer. be. Body fluids refer to fluids discharged from the body, such as urine, blood, and water in loose stools.

<Absorbent article>
This embodiment will be described below with reference to the drawings. FIG. 1 shows an absorbent article 1 according to a first embodiment. FIG. 2 is a sectional view of the absorbent article 1. FIG. 3 shows a masking laminate in which a body fluid absorbing pouch (hereinafter also referred to as "SAP pouch") 18 is laminated on the absorbent body 17 side of a deodorant pouch 19. FIG. 4 shows the SAP pouch 18. These drawings do not define the shapes, dimensions, size relationships, etc. of each component in the absorbent article of this embodiment.

The absorbent article 1 of this embodiment can be used as a variety of absorbent articles, whether for babies or adults, but typical examples include light incontinence pads, urine absorbing pads, pants-type disposable diapers, and taped disposable diapers. Can be mentioned. Various paper diapers as an outer and the absorbent article 1 as an inner may be combined. The lengthwise dimension and the widthwise dimension of the absorbent article 1 are not particularly limited, and are, for example, in the range of 100 mm or more and 800 mm or less, and in the range of 50 mm or more and 500 mm or less. By adjusting the dimensions of the absorbent article 1 within the above range, absorbent articles for various uses can be obtained.

As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable top sheet 25 that is located relatively on the skin side when the absorbent article 1 is worn, and a top sheet 25 that faces the top sheet 25. a liquid-impermeable backsheet 30 that is placed on the non-skin side when the absorbent article 1 is worn; an absorbent body 17 that is placed between the topsheet 25 and the backsheet 30; It includes an adhesive layer 60 arranged on the non-skin side surface of the back sheet 30 and a pair of three-dimensional gathers 40 provided on the skin side surface of the top sheet 25. The absorbent body 17 is sandwiched between a top sheet 25 and a back sheet 30, and body fluids such as urine are absorbed and retained in the absorbent body 17 through the top sheet 25. Depending on the use and type of the absorbent article 1, leg gathers, waist gathers, side flaps, etc. can be provided as appropriate.

Furthermore, in the present embodiment, the absorbent body 17 has a slit 35 extending in the longitudinal direction at the center part in the width direction, one opening of the slit 35 is in contact with the non-skin side of the top sheet 25, and the other opening is in contact with the non-skin side of the top sheet 25. It is in contact with the skin side of the back sheet 30. The slit 35 will be described later. The skin side of the backsheet 30 exposed through the other opening of the slit 35 has an SAP pouch 18 relatively located on the absorber 17 side and a deodorizing pouch 19 located relatively on the backsheet 30 side. masking laminates are arranged (FIG. 3). The SAP pouch 18 is arranged to cover the surface of the deodorizing pouch 19 on the top sheet 25 side.

The skin side of the backsheet 30 and the deodorizing pouch 19, and the deodorant pouch 19 and the SAP pouch 18 may be fixed to each other using a hot melt adhesive or the like. Further, the edge portion of the SAP pouch 18 may be fixed to the skin side of the backsheet 30. Further, in this embodiment, as shown in FIG. 1, five masking laminates are arranged in a line along the skin side of the backsheet 30 at the opening of the slit 35, but the present invention is not limited to this. One or more masking laminates may be arranged, and one or more masking laminates may be arranged between the absorbent body without slits and the backsheet.

According to this embodiment, the skin side of the deodorant pouch 19 placed on the skin side of the backsheet 30 is covered with the SAP pouch 18, and the superabsorbent polymer 12 is placed in the bag made of hydrophilic nonwoven fabric as the SAP pouch 18. As the deodorizing pouch 19, a paper base material impregnated with a liquid masking agent in a saturated state is sealed in a bag made of a water-soluble resin film. According to such a configuration, at the same time as the deodorant pouch 19 absorbs body fluids and melts, the SAP in the SAP pouch 18 gels, preventing the masking agent from moving toward the skin, and the breathable backsheet A masking incense and/or a harmonized incense (described later) is emitted through the mask 30, and the fragrance is emitted to the outside with a moderate intensity, making it possible to prevent body fluid odor without being noticeable. Further, the deodorant pouch 19 is protected by the SAP pouch 18 and the back sheet 30, and tearing of the deodorant pouch 19 before use can be significantly prevented. Furthermore, by impregnating the paper base material with the liquid masking agent in a saturated state, even if the deodorizing pouch 19 is torn due to rough handling of the absorbent article 1, the liquid masking agent can pass through the back sheet 30. It will not seep out or adhere to the wearer's skin or clothing, impairing the feeling of wearing it. Further, it is preferable that the water-soluble resin film is a polyvinyl alcohol resin with gas barrier properties (low oxygen permeability), since this prevents the masking agent from escaping from the deodorizing pouch before absorption.

Furthermore, if the SAP pouch 18 and the deodorizing pouch 19 are placed in an area that does not overlap with the adhesive layer 60 in the thickness direction, the movement of the liquid masking agent in the horizontal direction will be extremely slow. It does not flow to a certain area and prevents deterioration of the adhesive layer due to liquid masking agent, especially perfume. When the dimensions of the SAP pouch 18 are sufficiently larger than the deodorizing pouch 19, the effect of preventing the liquid masking agent from moving in the horizontal direction is particularly large.

Hereinafter, each of the sheet-like or plate-like constituent members will be explained in more detail in the order of top sheet 25, absorbent body 17, SAP pouch 18, deodorant pouch 19, back sheet 30, three-dimensional gathers 40, and adhesive layer 60. Note that these constituent members may have a three-dimensional structure other than sheet-like or plate-like.

(Top sheet)
The top sheet 25 is a liquid-permeable sheet-like member that allows bodily fluids to pass quickly toward the absorbent body 17, and is disposed opposite to the back sheet 30 with the absorbent body 17 in between. Since the top sheet 25 may come into contact with the wearer's skin, it is preferable to use a base material that is soft to the touch and does not irritate the skin. Examples of the base material include a hydrophilic nonwoven fabric, a composite nonwoven fabric that is a laminate of hydrophilic nonwoven fabrics of the same type or different types, an open film such as an open polyethylene film, and a foamed film such as urethane foam. Hydrophilic nonwoven fabrics are produced using, for example, synthetic fibers made of synthetic resins such as polypropylene and polyethylene, recycled fibers such as rayon, and natural fibers such as cotton. It can be obtained by processing using a known method.

Further, the top sheet 25 may be embossed or perforated on the surface in order to improve liquid permeability. As a method for performing these embossing and perforation processes, known methods can be used without any restriction. Further, in order to reduce irritation to the skin, the top sheet 25 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a humectant, and the like.

From the viewpoints of strength, workability, and liquid return amount, the basis weight of the top sheet 25 is preferably 15 g/m ² or more and 40 g/m ² or less. The shape of the top sheet 25 is not particularly limited, and may be any shape that covers part or all of the absorbent body 17 as required to guide body fluids to the absorbent body 17 to prevent leakage.

(Absorber)
The absorbent body 17 of this embodiment has a slit 35 extending in the longitudinal direction at the center portion in the width direction. The slits 35, for example, improve the dispersibility of body fluids in the absorbent body 17, allowing the body fluids to spread to the periphery of the absorbent body 17, especially to the periphery in the longitudinal direction, thereby improving the absorption performance of the absorbent article 1 and improving the body fluid absorption. quantity is improved. Further, by providing the masking laminate of the SAP pouch 18 and the deodorant pouch 19 in the slit 35, there is an advantage that the thickness of the absorbent article 1 can be reduced.

The number of slits 35 is not limited to one in this embodiment, but may be multiple. In addition, from the viewpoint of fully exhibiting the above-mentioned effects of the slits 35 and maintaining the strength of the absorbent body 17, the length of the slits 35 should be 50% or more and 90% or less of the length of the absorbent body 17. The width direction dimension of the slit 35 is 2 mm or more and 20 mm or less, and when a plurality of slits 35 are provided, the interval between adjacent slits 35 in the width direction is 10 mm or more and 40 mm or less.

The absorbent body 17 of this embodiment includes, for example, one whose main component is an absorbent base material, and one which contains an absorbent base material and an absorbent component mixed therein. As the absorbent base material, any absorbent base material included in absorbent articles such as sanitary napkins, diapers, and urine pads can be used without particular limitation. Examples include fibrous bodies. The absorbent substrate can be used singly or in combination of two or more. Among these absorbent substrates, fluff pulp, hydrophilic sheets, and the like are preferred from the viewpoints of liquid permeability, absorbency, texture, and the like. Examples of the fluff pulp include wood pulp, synthetic fibers, and flocculent defibrated materials such as non-wood pulps such as synthetic resin fibers. Examples of the hydrophilic sheet include tissue, absorbent paper, and hydrophilic nonwoven fabric. The basis weight of the fluff pulp is, for example, in the range of 50 g/m ² or more and 800 g/m ^{2 or} less from the viewpoint of absorption performance and texture. Moreover, the basis weight of other absorbent base materials is also selected according to the basis weight of the fluff pulp.

Examples of the absorbent component used in the absorbent body 17 include super absorbent polymers (hereinafter also referred to as "SAP"). There are no particular restrictions on the SAP as long as it can absorb body fluids and prevent backflow, such as polyacrylates, polyaspartates, (starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) Examples include copolymers, (isobutylene-maleic anhydride) copolymers, and saponified products thereof. Among these, from the viewpoint of absorption per weight, polyacrylates are preferred, and sodium polyacrylate is more preferred. One type of SAP can be used alone or two or more types can be used in combination.

The form of the superabsorbent polymer is not particularly limited, but from the viewpoint of suppressing the occurrence of gel blocking and the like, it is preferably particulate, more preferably particulate with a medium particle size. The median particle diameter of the superabsorbent polymer 12 is, for example, in the range of 50 μm or more and 600 μm or less, or in the range of 50 μm or more and 550 μm or less. The basis weight of SAP in the absorber 17 is, for example, in the range of 10 g/m ² or more and 500 g/m ² or less from the viewpoint of absorption performance and texture, and the SAP content in the absorber 17 is, for example, 15 g/m 2 or less of the total amount of the absorber 17. The range is from % by mass to 50% by mass.

Examples of the form of the absorber 17 include the form of a laminated mat formed by mixing and dispersing SAP particles in an absorbent base material. Further, the absorbent body 17 may be wrapped in a carrier sheet for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorbent body 17. Examples of the carrier sheet include tissue, absorbent paper, and hydrophilic nonwoven fabrics such as air-laid nonwoven fabrics.

The planar shape of the absorber 17 is not particularly limited, and may include, for example, an hourglass shape, a substantially rectangular shape (rectangular shape), an I-shape, an elliptical shape, an elliptical shape, and a rounded quadrilateral with rounded four corners of a rectangle. can do. In addition, the absorbent body 17 of the present embodiment has a longitudinal dimension (or a maximum dimension in the longitudinal direction) and a dimension in the width direction (or a maximum dimension in the width direction), which are not particularly limited and may vary depending on the use, form, etc. of the absorbent article 1. Although it can be selected as appropriate, the longitudinal dimension is, for example, in the range of 100 mm or more and 800 mm or less, or 150 mm or more and 500 mm or less, and the width direction dimension of the absorber 17 is, for example, in the range of 50 mm or more and 500 mm or less, or The range is 60 mm or more and 400 mm or less. The thickness of the absorber 17 is, for example, in the range of 1 mm or more and 5 mm or less, or in the range of 2 mm or more and 3 mm or less.

(SAP sachet)
The SAP pouch 18 of this embodiment shown in FIG. 12. The SAP pouch 18 is made, for example, by folding the edges of approximately rectangular hydrophilic nonwoven fabric in half in the width (shorter side) direction, overlapping them, filling the inside with the superabsorbent polymer 12, and then inserting a predetermined width from the overlapping edges. It can be produced by bonding the regions to form a sealing layer 11 and sealing the superabsorbent polymer 12 inside. The sealing layer 11 can be formed, for example, by heat sealing, ultrasonic welding, adhesion using a hot melt adhesive, or the like. The planar shape of the SAP pouch 18 is not limited to the rectangular shape of this embodiment, but may be, for example, a square, a circle, an oval, an ellipse, a triangle, a square with rounded corners, or the like.

As shown in FIG. 4, the SAP pouch 18 has a long side dimension b in a range of, for example, 30 mm or more and 110 mm or less, or a range of 30 mm or more and 70 mm or less, and a short side dimension a, for example, in a range of 9 mm or more and 20 mm or less, or 9 mm. The range is 15 mm or more. Further, the thickness of the SAP pouch 18 is not particularly limited, but from the viewpoint of making the dimensions a and b significantly smaller than conventional absorbers as described above, it is, for example, in the range of 1.0 mm or more and 2.5 mm or less. The SAP pouch 18 as a whole has a flat three-dimensional shape. Such a flat three-dimensional shape is advantageous for covering the surface of the deodorizing pouch 19 on the top sheet 25 side. Further, since the SAP pouch 18 is thin and small as described above, it can be inserted into the absorbent article 1 without changing its structure.

If the dimension b is less than 30 mm and/or the dimension a is less than 9 mm, there is a tendency that the entire surface of the deodorant pouch 19 on the top sheet 25 side cannot be completely covered. In addition, the amount of superabsorbent polymer 12 that can be sealed in the bag body 10 is reduced, and in order to ensure the desired amount of body fluid absorption, it becomes necessary to use a large number of SAP sachets 18, The advantages gained by size tend to be diminished. When the dimension b exceeds 110 mm and/or the dimension a exceeds 20 mm, the thickness of the absorbent article 1 tends to increase and the feeling of wearing tends to decrease. In addition, the amount of superabsorbent polymer 12 encapsulated in one SAP pouch 18 increases, and local gel blocking occurs within the absorbent body or absorbent article, resulting in increased absorption of body fluids and repeated absorption of body fluids. There is a tendency for the absorption rate of body fluids to decrease.

Since the SAP pouch 18 has excellent body fluid absorption ability and can absorb body fluid from all directions, the amount of body fluid reaching the deodorant pouch 19 can be reduced. As a result, the water-soluble resin film on the outer layer of the deodorant pouch 19 dissolves in stages, so that the masking scent of the masking agent lasts for a long time, and even when body fluids are repeatedly absorbed, the body fluid odor masking effect is maintained. can get.

The hydrophilic nonwoven fabric constituting the bag body 10 is not particularly limited, and examples thereof include air-through nonwoven fabric, thermal bond nonwoven fabric, spunlace nonwoven fabric, spunbond nonwoven fabric, pulp-containing nonwoven fabric, and the like. These nonwoven fabrics include one or more types of fibers, such as fibers made of synthetic resins such as polypropylene, polyethylene, and polyester, recycled fibers such as rayon, and natural fibers such as cotton. Among these, air-through nonwoven fabrics, pulp-containing nonwoven fabrics, and the like are preferred from the viewpoint of body fluid absorbency, strength, flexibility, moldability, and the like.

A pulp-containing nonwoven fabric is, for example, one in which a pulp fiber web is laminated on at least one surface of a nonwoven fabric, as disclosed in US Pat. No. 5,284,703. For example, fibers constituting the nonwoven fabric and pulp fibers are entangled with each other on one surface of the nonwoven fabric to form a pulp fiber web, and some of the pulp fibers penetrate the nonwoven fabric in the thickness direction and appear on the other surface. The nonwoven fabric and the pulp fiber web are extremely strongly bonded and integrated. Here, "integration" means that the nonwoven fabric and the pulp fiber web do not separate to the extent that the functionality of the pulp-containing nonwoven fabric is deteriorated until the absorbent article is used up. The above-mentioned pulp-containing nonwoven fabric can be produced, for example, by spraying pulp fibers onto the nonwoven fabric using a hydroentangling method.

The nonwoven fabric in the pulp-containing nonwoven fabric is not particularly limited, but is preferably a spunbond nonwoven fabric, more preferably a spunbond nonwoven fabric containing polypropylene fibers, and even more preferably a spunbond nonwoven fabric made of polypropylene fibers. The basis weight of the nonwoven fabric is in the range of 7 g/m ² or more and 30 g/m ² or less, and the basis weight of the pulp fiber web is, for example, in the range of 30 g/m ² or more and 50 g/m ² or less. The basis weight of the pulp-containing nonwoven fabric is, for example, in the range of 40 g/m ² or more and 60 g/m ² or less, or in the range of 40 g/m ² or more and 50 g/m ² or less, from the viewpoint of strength, texture, etc. In one embodiment, the pulp fiber web is configured to face the outside of the bag body 10 and the nonwoven fabric faces the inside of the bag body 10. This configuration improves the liquid absorbency of the bag body 10.

As the superabsorbent polymer 12 enclosed in the bag main body 10, the superabsorbent polymer used for the absorber 17 can be used. Further, the particle size of the superabsorbent polymer 12 is not particularly limited, but from the viewpoint of not impairing the thinness of the SAP bag 18, the median particle size is, for example, in the range of 50 μm or more and 600 μm or less.

One embodiment of the SAP pouch 18 is one in which the superabsorbent polymer 12 is encapsulated in the bag body 10 as it is. Another embodiment of the SAP pouch 18 is one in which the superabsorbent polymer 12 is enclosed in the bag body 10 while being wrapped in a carrier sheet such as tissue, absorbent paper, or air-laid nonwoven fabric. In other embodiments, the superabsorbent polymer 12 may be fixed to the surface of the carrier sheet with double-sided tape, adhesive, or the like. Further, it is preferable that the superabsorbent polymer 12 is enclosed in the bag body 10 in the form of particles.

The amount of superabsorbent polymer 12 enclosed in each SAP pouch 18 is in the range of 0.03 g to 0.3 g, or in the range of 0.05 g to 0.15 g. If the amount of the superabsorbent polymer 12 is within the above range, the superabsorbent polymer 12 will not swell significantly even after absorption of body fluids, resulting in a lumpy feel, and the thickness of the SAP pouch 18 will hardly increase. Therefore, the feel, wearing feel, and fit of the absorbent article 1 including the SAP pouch 18 after absorbing body fluids can be improved.

If the amount of superabsorbent polymer 12 enclosed is less than 0.03 g, the amount of body fluid absorbed per superabsorbent polymer 12 decreases, and at least one of the advantages of the SAP pouch 18 described above tends to be impaired. When the amount of superabsorbent polymer 12 enclosed exceeds 0.3 g, local gel blocking tends to occur within the absorbent article 1 or absorbent body 17, and the amount of body fluid absorbed and the absorption rate after repeated absorption of body fluids decrease. There is a tendency to decrease.

(Deodorizing sachet)
In the deodorant pouch 19 of this embodiment, as the absorbent article 1 absorbs body fluids, the water-soluble resin film of the outer layer is dissolved by the water in the body fluids, and exhibits a body fluid odor masking effect and/or a harmonized effect. The harmonized effect refers to the selection of masking agents that harmonize with body fluid odor, and instead of forcibly suppressing body fluid odor, it incorporates body fluid odor as one of the components of the "good scent" that is ultimately imagined. It is an effect. In other words, it harmonizes with the odor of body fluids and changes the odor or fragrance to one that does not bother people so much.

The deodorizing pouch 19 of this embodiment is a bag made of a water-soluble resin film, in which a paper base material 20 impregnated with a liquid masking agent in a saturated state is enclosed. Here, the liquid masking agent is a masking agent that exhibits a liquid state under atmospheric pressure. In addition, the saturated state of the liquid masking agent refers to a state in which the liquid masking agent is impregnated into the paper base material 20 to the maximum extent, and a portion of the liquid masking agent liquefies under atmospheric pressure and does not leak out from the paper base material 20. This varies depending on the type of liquid masking agent and the paper base material 20, but can be easily set by conducting a plurality of experiments by varying the immersion time of the paper base material 20 in the liquid masking agent. As a method for impregnating the paper base material 20 with the liquid masking agent in a saturated state, for example, the paper base material 20 is immersed in the liquid masking agent under reduced pressure for a predetermined time, and then the paper base material 20 is taken out and impregnated under atmospheric pressure for a predetermined time. Examples include a method of leaving it for a while.

FIG. 3 shows a masking laminate in which the top sheet 25 side surface of the deodorant pouch 19 is covered with the SAP pouch 18. For example, as shown in FIG. 3, the deodorant pouch 19 is made by folding the edges of a substantially rectangular water-soluble resin film in half in the width (short side) direction and overlapping them, and impregnating the inside with a liquid masking agent in a saturated state. By accommodating the paper base material 20 that has been saturated, a region of a predetermined width from the overlapped edges is adhered to form a sealing layer 19a, and the paper base material 20 impregnated with a liquid masking agent in a saturated state is sealed inside. It can be made. The seal layer 19a can be formed, for example, by heat sealing, ultrasonic welding, or the like. The planar shape of the deodorant pouch 19 is not limited to the rectangular shape of this embodiment, but may be, for example, a square, a circle, an oval, an ellipse, a triangle, a square with rounded corners, or the like. The three-dimensional shape of the deodorant pouch 19 is a thin flat shape in this embodiment.

The dimensions of the deodorant pouch 19 shown in FIG. 3 are such that the longitudinal dimension is, for example, in a range of 30 mm or more and 60 mm or less, and the width direction dimension is, for example, in a range of 10 mm or more and 50 mm or less. By selecting the dimensions from each of the above ranges, it becomes easy to be covered with the SAP pouch 18, and the size contains a liquid masking agent in an amount that can exert a masking effect and/or a harmonized effect over the entire period of use of the absorbent article 1. It becomes possible to store the paper base material 20.

The dimensions of the paper base material 20 can be appropriately selected depending on the materials of the deodorizing pouch 19 and the paper base material 20, but the longitudinal dimension is, for example, in the range of 20 mm or more and 40 mm or less, and the width direction dimension is in the range of 5 mm or more and 10 mm or less. It is. By using the paper base material 20 in such a range, it is possible to impregnate the absorbent article 1 with an amount of liquid masking agent that can exhibit a masking effect and/or a harmonized effect over the entire period of use. The paper base material 20 is not particularly limited as long as it can be impregnated with a liquid masking agent, and examples thereof include water-absorbing paper (e.g., tissue paper, toilet paper, paper towel, etc.), liner base paper, paperboard, kraft paper, and high-quality paper. , filter paper, the above-mentioned pulp-containing nonwoven fabric, and the like. Among these, filter paper with good volatility of the liquid masking agent is preferred.

In addition, as the liquid masking agent impregnated into the paper base material 20, deodorants, deodorizing agents, fragrances (natural fragrances and synthetic fragrances), etc. that are liquid under atmospheric pressure can be used without particular limitation. Perfume is preferred from the viewpoint of masking effect and especially harmonized effect. Specific examples of fragrances include agave incense, benzoin, beaver incense, spirit cat incense, clove oil, galbanum, jasmine absolute, melilot, mimosa, musk tonquin, rosemary oil, sandalwood oil, vetiver oil, violet leaf absolute, etc. natural fragrances, higher alcohols, aldehydes, benzaldehyde, benzoic acid, cinnamic acid, cinnamic aldehydes, cinnamic alcohols, esters, ketones, salicylic acid and related compounds, synthetic fragrances such as vanillin, mixtures of two or more of these, etc. Can be mentioned. Commercially available fragrance products can also be widely used. Further, in this embodiment, a fragrance in which a fragrance component is dissolved in a solvent may be used. If necessary, two or more kinds of fragrances may be used in combination.

The water-soluble resin film constituting the bag that encloses the paper base material 20 impregnated with a liquid masking agent in a saturated state is not particularly limited, but may include, for example, water-soluble resin such as polyvinyl alcohol, polyvinylpyrrolidone, polyacrylamide, polyvinyl methylene ether, etc. polyvinyl resins, polyether resins such as polyethylene oxide, cellulose resins such as carboxymethyl cellulose, hydroxypropyl cellulose, and hydroxyethyl cellulose, (meth)acrylic resins such as poly(meth)acrylate, polysaccharide polymer compounds such as alginic acid, pullulan, xanthan, etc. Examples include films consisting of: Among these, polyvinyl alcohol film is preferred from the viewpoints of high oil resistance, high gas barrier properties, and ease of heat sealing. Commercially available water-soluble resin films can be used, such as Claria VF-HP270 (trade name, film thickness 40 μm, manufactured by Kuraray Co., Ltd.).

(back seat)
The backsheet 30 has liquid impermeability so that the body fluids held by the absorbent body 10 do not wet clothing, and breathability that allows the masking fragrance emitted by the deodorant pouch 19 to dissolve in the water in the body fluids to pass through. It may be formed using a base material provided therein, and may be formed from a material such as a resin film or a composite sheet made by laminating a resin film and a nonwoven fabric. The manufacturing method of the nonwoven fabric used in the composite sheet is not particularly limited, and examples include spunbond nonwoven fabric, meltblown nonwoven fabric, composite nonwoven fabric that is a laminate of spunbond nonwoven fabric/meltblown nonwoven fabric, and spunbond nonwoven fabric/meltblown nonwoven fabric/spunbond nonwoven fabric. Examples include composite nonwoven fabrics that are laminates and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, and a composite film of polyethylene and polypropylene. Many resin films usually have low air permeability, but in that case, a breathable resin film can be obtained by adding and mixing a filler such as calcium carbonate to the resin melt and then forming it into a film. I can do it. Further, in terms of strength and workability, the basis weight of the backsheet 30 is, for example, in the range of 15 g/m ² or more and 40 g/m ² or less.

(3D gathers)
In addition, as shown in FIG. 1, the absorbent article 1 is provided at both ends of the skin side of the top sheet 25 along the longitudinal direction of the absorbent article 1 in order to prevent side leakage of bodily fluids excreted by the user. , a pair of three-dimensional gathers 40 are provided. One end of the three-dimensional gathers 40 in the width direction of the absorbent article 1 is fixed near both ends in the width direction of the skin side of the backsheet 30, and furthermore, the root of the upright part in the middle part in the width direction is fixed to the skin side of the top sheet 25. , the other end in the width direction becomes a free end 40a that is not fixed to the top sheet 25. By providing an elastic elastic member (not shown) for three-dimensional gathers along the longitudinal direction near the free ends 40a, the free ends 40a of the three-dimensional gathers 40 are given erectability and can be deformed to suit the wearer's body shape. Become something.

The fixing position of one end in the width direction of the three-dimensional gathers 40 is not limited to this embodiment. It may be on both ends in the width direction of the joined bag body, on the skin side of the top sheet 25, or the like. At this time, the intermediate portions of the three-dimensional gathers 40 in the width direction may be fixed near both end portions of the skin side surfaces of the top sheet 25. Note that the absorbent article 1 of this embodiment also includes an embodiment that does not include three-dimensional gathers.

The three-dimensional gathers 40 are, for example, water-repellent or liquid-impermeable nonwoven fabrics made of hydrophobic fibers, such as spunbond nonwoven fabrics, meltblown nonwoven fabrics, and laminates of spunbond nonwoven fabrics/meltblown nonwoven fabrics/spunbond nonwoven fabrics. Composite nonwoven fabric etc. are used. As the elastic member for three-dimensional gathers, for example, a polyurethane thread, a band-shaped polyurethane film, a thread-shaped or band-shaped natural rubber, etc. are used.

The absorbent article 1 of this embodiment includes an adhesive layer 60 on the non-skin side of the backsheet 30 to prevent the absorbent article 1 from shifting within the wearer's clothing. The adhesive layer 60 of this embodiment is configured as a general adhesive layer. Such an adhesive layer 60 may deteriorate due to contact with fragrances and the like, and its adhesive strength may decrease or be lost. Furthermore, the components contained in the adhesive layer 60 may tear the water-soluble resin film that is the outer layer of the deodorizing pouch 19, causing unnecessary release of the masking agent. Therefore, in the present embodiment, the masking laminate (the laminate of the SAP pouch 18 and the deodorant pouch 19) and the adhesive layer 60 are arranged at positions where they do not overlap in the thickness direction of the absorbent article 1. is preferred. Note that the adhesive layer 60 is not limited to this embodiment, and may be formed of, for example, a hook-and-loop fastener.

<Method for manufacturing absorbent articles>
The absorbent article 1 can be manufactured by a known manufacturing method, for example, a step of arranging one or more masking laminates on the skin side of the backsheet 30, and a step of disposing the absorbent body 17 between the topsheet 25 and the backsheet 30. a step of fixing the top sheet 25 and the back sheet 30 partially or over the entire circumference using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc.; A manufacturing method including the steps of arranging the three-dimensional gathers 40 at a predetermined position of the back sheet 30 and the step of arranging the adhesive layer 60 at a predetermined position of the back sheet 30 is mentioned. When the absorbent article 1 is a urine absorbing pad or a light incontinence pad, it may be individually wrapped in a package and then folded into three in the longitudinal direction. Further, leg gathers, waist gathers, side flaps, etc. can be provided as necessary.

Although the present invention has been described above using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope of the invention described in the above embodiments. It will be obvious to those skilled in the art that modifications may be made. Furthermore, it is clear from the claims that forms with such changes or improvements may also be included within the technical scope of the present invention.

10 Bag body 11, 19a Seal layer 12 Super absorbent polymer 17 Absorber 18 Body fluid absorption pouch (SAP pouch)
19 Deodorant sachet 20 Paper base material 25 Top sheet 30 Back sheet 35 Slit 40 Three-dimensional gathers 40a Free end of three-dimensional gathers 50 Absorbent article 60 Adhesive layer

Claims (5)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable and breathable back sheet, and an absorbent body disposed between the top sheet and the back sheet,
Between the layers of the absorbent body and the backsheet,
further comprising: a deodorizing pouch relatively disposed on the backsheet side; and a body fluid absorbing pouch relatively disposed on the absorbent body side and covering the deodorant pouch;
The deodorizing pouch is a bag made of a water-soluble resin film, in which a paper base material impregnated with a liquid masking agent to a saturated state is enclosed,
The body fluid-absorbing pouch includes a bag main body made of a hydrophilic nonwoven fabric and a superabsorbent polymer encapsulated inside the bag main body, and has a length of 30 mm or more and 110 mm or less, and a width of 9 mm or more and 20 mm. An absorbent article that is: further comprising an adhesive layer provided on the non-skin side of the backsheet,
The absorbent article according to claim 1, wherein the adhesive layer is arranged in a region that does not overlap with the deodorizing pouch and the body fluid absorbing pouch in the thickness direction. The absorbent article according to claim 1 or 2, wherein the deodorant pouch and the body fluid absorbent pouch each have a flat shape, and the body fluid absorbent pouch is larger than the deodorant pouch. The absorbent article according to any one of claims 1 to 3, wherein the water-soluble resin is polyvinyl alcohol. The absorbent article according to any one of claims 1 to 4, wherein the liquid masking agent is a liquid fragrance.

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