JP7344146B2 - absorbent articles - Google Patents

Description

The present invention relates to absorbent articles.

A typical absorbent article is composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between them. On the other hand, absorbent articles used for moderate to severe nursing care use large amounts of fluff pulp and superabsorbent polymers to absorb the numerous urinations that occur repeatedly during long periods of wear, such as at night. It is necessary to adopt a large-sized absorbent material using However, even if a large-sized absorbent material is used, the absorption site for body fluids such as urine tends to be limited to the urination point and its surroundings, and the absorbent material in the surrounding area away from the urination point often does not contribute to absorption. .

In order to solve these problems, many absorbent articles have been proposed that improve the diffusibility of body fluids such as urine in the absorbent body and keep the wearer comfortable, especially the top sheet surface dry. For example, in Patent Document 1, in order to improve body fluid diffusion in the absorbent body, a hydrophilic fiber web is inserted between a liquid-permeable top sheet and an absorbent body containing fluff pulp, a superabsorbent polymer, etc. Discloses disposing a liquid-diffusing sheet consisting of a hydrophobic fiber web and a hydrophobic fiber web.

Japanese Patent Application Publication No. 3-234255

However, in absorbent articles such as high-absorption urine pads, the diffusivity and absorbency of body fluids such as urine are not fully satisfactory even when various conventionally proposed techniques are used.

An object of the present invention is to provide an absorbent article that has excellent body fluid diffusibility and repeated absorbency.

As a result of extensive research to solve the above problems, the inventors of the present invention placed a predetermined liquid-diffusive sheet between the absorbent body and the backsheet, and made certain changes to the liquid-diffusible sheet and the absorbent body. By applying this method, they succeeded in obtaining a desired absorbent article and completed the present invention. The present invention provides, for example, the following absorbent articles (1) to (6) as preferred embodiments.

(1) An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet,
The absorbent body has at least one first opening extending in the longitudinal direction in the width direction,
Further comprising a liquid-diffusing sheet disposed between the absorbent body and the backsheet,
The liquid diffusing sheet includes a composite nonwoven fabric comprising a spunbond nonwoven fabric and a pulp fiber web integrated on the surface of the spunbond nonwoven fabric, and has a second opening extending in the longitudinal direction in the width direction. have at least two or more,
The absorbent article, wherein the number of the second openings is greater than the number of the first openings.
(2) The absorbent body includes a plurality of absorbent layers laminated in the thickness direction, each of the plurality of absorbent layers having a third opening extending in the longitudinal direction, and the third opening of the plurality of absorbent layers. The absorbent article according to (1) above, wherein the three openings communicate in the thickness direction to form the first opening.
(3) The third openings of the plurality of absorbent layers have their center lines in the width direction aligned with the thickness direction, and the third openings of the absorbent layer located on the top sheet side are arranged in the back sheet. The absorbent article according to (2) above, wherein the widthwise dimension is smaller than the third opening of the absorbent layer located on the side.
(4) The above (1) to (3), wherein the widthwise dimension of the first opening is 5 mm or more and 50 mm or less, and the widthwise dimension of the second opening is 1 mm or more and 15 mm or less. Any absorbent article.
(5) Any one of (1) to (4) above, wherein the liquid diffusing sheet has a plurality of second openings in the width direction, and the interval in the width direction of the second openings is 30 mm or less. absorbent articles.
(6) The absorbent according to any one of (1) to (5) above, wherein the longitudinal dimension of the second opening is 50% or more and 95% or less of the total longitudinal length of the liquid diffusing sheet. Goods.

According to the present invention, an absorbent article with excellent body fluid diffusivity and repeated absorbency is provided.

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 XX shown in FIG. 1. FIG. FIG. 3 is a plan view schematically showing the configuration of an absorbent article according to a second embodiment of the present invention. 4 is a schematic cross-sectional view in the width direction taken along the line XX shown in FIG. 3. FIG.

In this specification, it is defined as follows. When an absorbent article is worn refers to a state in which the absorbent article is worn on the body, regardless of whether before or after absorbing body fluids. The longitudinal direction of the absorbent article is the direction extending from the front and back of the wearer's body through the crotch region when the absorbent article is worn, the width direction is the direction substantially perpendicular to the longitudinal direction, and the thickness direction is the direction as described above. This is a direction substantially perpendicular to a plane including the longitudinal direction and the width direction, and is, for example, the lamination direction of each component. In addition, of both the front and back surfaces of the absorbent article and each component, the surface that contacts or faces the wearer's skin is defined as the skin side, and the surface that contacts or faces the wearer's clothing is defined as the skin side. Let be the non-skin side. Furthermore, in all embodiments, constituent members having the same or similar functions and/or effects are given the same reference numerals, and the description of the first embodiment is referred to. Body fluids refer to fluids discharged from the body, such as urine, blood, and water in loose stools.

The absorbent article of this embodiment can be used as an absorbent article for various purposes, whether for babies or adults, such as urine absorbing pads, light incontinence pads, pants-type disposable diapers, tape-fastened disposable diapers, and disposable disposable diapers. Among these, there is an embodiment in which the absorbent article of this embodiment is used alone as a urine absorbing pad, and an embodiment in which the absorbent article of this embodiment is used as an inner (urine absorbing pad) and various paper diapers as an outer. More preferred are embodiments in which: The lengthwise and widthwise dimensions of the absorbent article of this embodiment are not particularly limited, but 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, respectively. By adjusting the dimensions of the absorbent article of this embodiment within the above range, it can be used for various purposes.

Hereinafter, the absorbent article 1 of this embodiment will be described in detail with reference to the drawings. 1 and 3 are schematic plan views showing absorbent articles 1 according to two embodiments, respectively. 2 and 4 are schematic cross-sectional views taken along the line XX shown in FIGS. 1 and 3, respectively. In FIGS. 2 and 4, each component is shown as being in close contact with each other in the thickness direction, but there may be one or more gaps between at least one of the components. Moreover, each figure does not specify the size relationship, size, or shape of each component of the absorbent article 1 in the longitudinal direction, width direction, and thickness direction.

<Absorbent article>
The absorbent article 1 of this embodiment shown in FIGS. 1 and 2 includes a liquid-permeable top sheet 10 located on the skin side when worn, and a liquid-impermeable back sheet 11 located on the non-skin side when worn. , an absorbent body 12 provided between a top sheet 10 and a back sheet 11, a liquid-diffusive sheet 13 provided between a back sheet 11 and an absorbent body 12, and three-dimensional gathers 14, The body 12 has one or more first openings 30 extending in the longitudinal direction in the width direction, and the liquid diffusing sheet 13 includes a spunbond nonwoven fabric and a pulp fiber web integrated on the surface of the spunbond nonwoven fabric. and has two or more second openings 31 extending in the longitudinal direction in the width direction, and the number of second openings 31 is greater than the number of first openings 30. It is something. Here, the first and second openings 30 and 31 are through holes that penetrate the absorber 12 and the liquid diffusing sheet 13 in the thickness direction, respectively.

According to the present embodiment, the predetermined composite nonwoven fabric used as the liquid-diffusing sheet 13 has excellent body fluid absorbency and body fluid permeability, so that the body fluid that has wrapped around between the back sheet 11 and the absorbent body 12 can be efficiently absorbed. It can be guided to the absorber 12. On the other hand, a relatively large amount of body fluid flowing through the top sheet 10 is initially absorbed by the absorbent components contained in the absorbent core 12, but is dammed up by the absorbent components swelling on the surface layer of the absorbent core 12. The rate of absorption may decrease and you may not be able to absorb enough body fluids. On the other hand, not only the absorbent body 12 relatively close to the skin side but also the liquid diffusive sheet 13 relatively distant from the skin side have first and second openings 30 extending in the longitudinal direction. , 31, a flow of body fluid occurs within the absorber 12, and the body fluid reaches every corner of the absorber 12 without reducing the flow rate so much that the absorbent components within the absorber 12 are absorbed. Most or almost all of it becomes available for absorption of body fluids. As a result, a good absorbent article can be obtained that has excellent absorption performance that can absorb repeated urination and maintain comfort for the wearer for a long time.

Therefore, in this embodiment, by effectively utilizing the absorption components in the peripheral area away from the urinary point, repeated urination can be absorbed for a long time without excessively increasing the amount of fluff pulp and superabsorbent polymer. It is possible to provide an absorbent article with excellent absorbent performance that keeps the wearer comfortable for hours on end.

Hereinafter, each of the sheet-like or plate-like constituent members will be described in detail in the order of the top sheet 10, the back sheet 11, the absorbent body 12, the liquid-diffusive sheet 13, and the three-dimensional gathers 14. Note that each component may have a three-dimensional shape other than sheet-like or plate-like.

(Top sheet)
The topsheet 10 is composed of a base material having liquid permeability such that body fluids can pass through the topsheet 10 and move to the absorbent body 12. Liquid permeable substrates for the top sheet include, for example, nonwoven fabrics such as air-through nonwoven fabrics, thermal bond nonwoven fabrics, and spunbond nonwoven fabrics, composite nonwoven fabrics made by laminating the same or different types of nonwoven fabrics such as thermal bond/spunbond fabrics, urethane foam, and polyethylene. Examples include foamed films made of foam and the like, and composite sheets that are laminates of two or more of these. Among these, hydrophilic nonwoven fabrics such as thermal bond nonwoven fabrics, spunbond nonwoven fabrics, thermal bond/spunbond composite nonwoven fabrics, etc. is preferred.

The surface of the top sheet 10 may be embossed or perforated, for example, in order to improve liquid permeability. Embossing and perforation can be carried out using known methods without any limitations. Further, in order to reduce irritation to the skin, the top sheet 10 may contain a lotion, an antioxidant, an anti-inflammatory component, a pH adjuster, an antibacterial agent, a humectant, and the like.

The basis weight of the top sheet 10 of this embodiment is not particularly limited, but from the viewpoint of strength, workability, and liquid return amount, it is preferably 15 g/m ² or more and 200 g/m ² or less, more preferably 18 g/m ² or more and 40 g / ^m2 or less. The shape of the top sheet 10 is not particularly limited, but may be any shape that covers the absorbent body 12 and is required to guide body fluids to the absorbent body 12 without leakage.

(back seat)
The backsheet 11 is made of an air-permeable or non-air-permeable liquid-impermeable base material that prevents body fluids held by the absorber 12 from wetting clothing or adhering to the skin surface. Examples of the backsheet base material include a resin film, a composite sheet that is a laminate of a resin film and a nonwoven fabric, and the like. Examples of the resin film include films made of synthetic resins such as polyester, polyvinyl alcohol, polyethylene, and polypropylene, and composite films of polyethylene and polypropylene. 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 and meltblown nonwoven fabric, spunbond nonwoven fabric, meltblown nonwoven fabric, and spunbond nonwoven fabric. Examples include composite nonwoven fabrics that are laminates with. Among these, breathable, non-air permeable, and liquid-impermeable plastic films are preferred from the viewpoint of preventing lateral leakage of body fluids.

The basis weight of the backsheet 11 is not particularly limited, but from the viewpoint of strength and workability, it is preferably 15 g/m ² or more and 40 g/m ² or less. Further, in order to prevent stuffiness when worn, it is preferable that the back sheet 11 has breathability. The method for imparting air permeability to the backsheet 11 is not particularly limited and any known method can be adopted, but for example, a method of making a resin film, which is the base material for the backsheet, porous, a method of embossing the base material for the backsheet, etc. Examples include methods of applying An example of a method for making a resin film porous is a method in which a resin is made to contain a filler to form a film, and the filler is removed from the obtained film. Examples of fillers include inorganic salts such as calcium carbonate.

(Absorber)
As shown in FIGS. 1 and 2, the absorbent body 12 of this embodiment is arranged between the top sheet 10 and the liquid-diffusive sheet 13, and has a first opening extending in the longitudinal direction near the center in the width direction. It has one 30. The first opening 30 penetrates the absorber 12 in the thickness direction. The number of first openings 30 is not limited to one, and may be two or more. When the absorbent body 12 has two or more openings 30, the plurality of openings 30 are arranged approximately parallel to the width direction from the viewpoint of the mechanical strength of the absorbent body 12, body fluid absorption performance, etc. It is preferable that the The number, longitudinal dimension, and width dimension of the first openings 30 are not particularly limited, and can be appropriately selected from a wide range depending on the inherent mechanical strength of the absorbent body 12, the dimensions of the absorbent body 12, etc. Preferably, the number is 1 or more and 3 or less, the longitudinal dimension is 100 mm or more and 500 mm or less, and the width direction dimension is 5 mm or more and 50 mm or less. Further, the first opening 30 may be provided in a substantially trapezoidal cross-sectional shape in which the diameter gradually increases in the thickness direction from the top sheet 10 toward the liquid-diffusing sheet 13; It may be provided in a substantially step-like cross-sectional view.

The absorbent body 12 of other embodiments may be a laminate of a plurality of absorbent layers 12a, 12b, as shown in FIGS. 3 and 4. Although this embodiment is a laminate of two absorbent layers 12a and 12b, the present invention is not limited to this, and may be a laminate of three or more layers. The absorbent layers 12a and 12b each have two third openings 30A and 30B in the width direction that extend in the longitudinal direction. The two third openings 30A and 30B are arranged substantially parallel to each other in the width direction. Although the number of third openings 30A and 30B is two each in this embodiment, it is not limited to this, and may be one or three or more. In this case, the dimensions in the longitudinal direction and the width direction of the absorbent layer 12a on the top sheet 10 side and the absorbent layer 12b on the liquid-diffusive sheet 13 side may be such that the dimension of the absorbent layer 12a is larger than the dimension of the absorbent layer 12b. The dimensions of the layer 12a may be the same as the dimensions of the absorbent layer 12b, or the dimensions of the absorbent layer 12a may be smaller than the dimensions of the absorbent layer 12b.

Moreover, it is preferable that the center lines in the width direction of the third opening 30A of the absorbent layer 12a and the opening 30B of the absorbent layer 12b overlap in the thickness direction (vertical direction) and communicate in the thickness direction. In this way, the third openings 30A and 30B may be connected in the thickness direction to form the first opening 30. That is, it can be said that the absorbent article 1 shown in FIGS. 3 and 4 has two first openings 30.

Further, in the absorbent article 1 shown in FIGS. 3 and 4, the widthwise dimensions of the third openings 30A and 30B of the absorbent layers 12a and 12b increase from the top sheet 10 side toward the liquid diffusing sheet 13 side. or smaller. According to such an embodiment, for example, the usage rate of the absorbent component in the absorbent layer 12a near the top sheet 10 (the rate of bodily fluid absorption of the absorbent component) and the absorbent component in the absorbent layer 12b close to the liquid-diffusive sheet 13 are determined. Absorbent components that can withstand repeated absorption can remain almost uniformly throughout the absorber 12 without causing a large difference in utilization ratio. Note that the number, longitudinal dimension, and width dimension of the third openings 30A, 30B may be appropriately selected according to the number, longitudinal dimension, and width dimension of the first openings 30.

Furthermore, in each of the absorbent articles 1 shown in FIGS. 1 and 3, when the first opening 30 has a width dimension of 5 mm or more and 50 mm or less, a second opening 31 described later has a width dimension of 1 mm or more. It is preferably 15 mm or less. By setting the width direction dimensions of the first and second openings 30 and 31 within these ranges, the liquid absorption from the top sheet 10 side of the absorber 12 and the supplementary liquid absorption from the liquid diffusing sheet 13 side are improved. The liquid absorption properties are complementarily improved in a well-balanced manner, most of the liquid absorption components in the absorbent body 12 can be efficiently utilized, the absorption capacity is significantly increased, and absorption can be repeated several times or more.

The absorbent body 12 of this embodiment contains absorbent fibers as a base material and super absorbent polymer (SAP). Absorbent fibers are not particularly limited as long as they are generally used in absorbent articles such as sanitary napkins, diapers, and incontinence pads; examples include fluff pulp, cotton, rayon, acetate, tissue, absorbent paper, and hydrophilic fibers. Examples include synthetic nonwoven fabrics. Among these, it is preferable to use fluff pulp from the viewpoint of absorbency. Examples of such fluff pulp include those obtained by defibrating wood pulp, synthetic fibers, polymer fibers, non-wood pulp, etc. into fluff. The basis weight of the absorbent fibers of the absorbent body 12 is preferably 50 g/m ² or more and 800 g/m ² or less from the viewpoint of not impairing absorption performance and texture.

The superabsorbent polymer (SAP) used in the absorbent body 12 is not particularly limited as long as it can absorb and retain body fluids and prevent backflow, such as polyacrylates, polyaspartates, ( Examples include starch-acrylic acid) graft copolymers, (acrylic acid-vinyl alcohol) 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 superabsorbent polymer can be used alone or two or more types can be used in combination. The amount of SAP in the absorber 12 is preferably set to a basis weight of 10 g/m ² or more and 500 g/m ² or less, and the content is 15% by mass or more and 50% by mass or less, so as not to impair absorption performance and texture. is preferred.

The form of the absorbent fibers and SAP in the absorbent body 12 is preferably in the form of a laminated mat formed by mixing SAP particles in the absorbent fibers. It is also possible to use SAP formed into fiber form. Further, for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorber 12, it is preferable to wrap the absorber 12 in a carrier sheet. The base material of the carrier sheet may be any material as long as it has hydrophilic properties, and examples thereof include tissue, absorbent paper, and hydrophilic nonwoven fabrics such as air-laid nonwoven fabrics. When a plurality of carrier sheets are provided, the base materials of the carrier sheets may be the same or different.

(liquid diffusing sheet)
The liquid diffusing sheet 13 of this embodiment is disposed between the absorber 12 and the backsheet 11, and has two or more openings 31 extending in the longitudinal direction and penetrating in the thickness direction. The liquid-diffusive sheet 13 of the present embodiment configured in this manner, for example, prevents bodily fluids reaching from the top sheet 10 side of the absorbent body 12 through the first openings 30 or flowing around the sides of the absorbent body 12. By adjusting the flow of the body fluid that has arrived at the absorber 12, it is possible to spread the body fluid almost uniformly over the entire surface of the absorbent body 12 on the liquid-diffusing sheet 13 side. In particular, the two or more second openings 31 extending in the longitudinal direction are very effective in spreading the body fluid over the entire surface of the absorber 12 on the liquid-diffusing sheet 13 side.

For example, the number of second openings 31 extending in the longitudinal direction of the liquid diffusive sheet 13 is greater than the number of first openings 30 in the absorbent body 12 from the viewpoint of improving the dispersibility of body fluids in the absorbent body 12. is configured such that the number is greater than the number of . More specifically, the liquid diffusive sheet 13 shown in FIGS. 1 and 2 has two second openings 31 extending in the longitudinal direction, and the liquid diffusive sheet 13 shown in FIGS. 3 and 4 has two second openings 31 extending in the longitudinal direction. It has five second openings 31, and the interval in the width direction between one second opening 31 and the second opening 31 adjacent thereto in the width direction is 30 mm or less. This improves the uniform diffusion of body fluids within the absorber 12. In this embodiment, the number of second openings 31 in the width direction is two or five, but is not limited to this, and considering the strength, shape retention, etc. of the liquid diffusing sheet 13, two or five second openings 31 are provided. The number can be appropriately selected from any number greater than or equal to 1.

Further, the longitudinal dimension of the second opening 31 is preferably 50% or more and 95% or less of the longitudinal dimension (total length) of the liquid diffusing sheet 13. As a result, while maintaining the strength of the liquid-diffusive sheet 13 within a practical range, the diffusivity of body fluids on the surface of the absorbent body 12 on the liquid-diffusible sheet 13 side is increased, and the surface of the absorbent body 12 on the liquid-diffusible sheet 13 side and Body fluids can be distributed throughout the surface layer. If it is less than 50%, the diffusibility of body fluids tends to be insufficient. If it exceeds 95%, the strength of the liquid-diffusive sheet 13 and, ultimately, the strength of the absorbent article 1 tends to decrease.

The liquid diffusing sheet 13 of this embodiment includes a composite nonwoven fabric. A composite nonwoven fabric is a combination of a spunbond nonwoven fabric and a pulp fiber web. Here, when the spunbond nonwoven fabric and the pulp fiber web are integrated, specifically, in normal use, the pulp fibers mainly contained in the pulp fiber web do not easily fall off from the composite nonwoven fabric. means. Especially when the pulp fibers are hydroentangled with the spunbond nonwoven fabric by a water jet, it is very difficult for the pulp fibers to fall off from the composite nonwoven fabric. In a preferred embodiment of the integrated product, for example, on one side of the spunbond nonwoven fabric, a part of the fibers constituting the spunbond nonwoven fabric and a part of the pulp fibers constituting the pulp fiber web are intertwined with each other to form a spunbond nonwoven fabric. An example of such a configuration is that the pulp fiber web and the spunbond nonwoven fabric are firmly attached to each other, and a portion of the pulp fibers penetrate through the spunbond nonwoven fabric in the thickness direction and are exposed on the other side of the spunbond nonwoven fabric. Such an integrated product can be obtained, for example, by a hydroentangling method.

As the spunbonded nonwoven fabric included in the composite nonwoven fabric, nonwoven fabrics produced by spunbond method, melt blowing method, flash spinning method, etc. can be used without particular limitation, but the material of the fibers constituting the nonwoven fabric is, for example, nylon. (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, polystyrene, and other synthetic resins can be preferably used. The spunbond nonwoven fabric is produced using synthetic resin fibers made of these materials, and may contain a plurality of synthetic resin fibers. The basis weight of the spunbond nonwoven fabric is not particularly limited, but from the viewpoint of tensile strength and soft touch, it is 7 g/m ² or more and 20 g/m ² or less.

As the pulp fiber web, a nonwoven fabric mainly composed of pulp fibers can be used without particular limitation, and a pulp fiber web formed by spraying pulp fibers onto the surface of a spunbond nonwoven fabric by a hydroentangling method may also be used. The pulp fiber used here is not particularly limited, but preferably bleached kraft pulp (NBKP) of softwood such as radiata pine, slash pine, southern pine, lodgepole pine, spruce, and Douglas fir. NBKP can be used alone or in combination of two or more. The basis weight of the pulp fiber web is not particularly limited, but is preferably 30 g/m ² or more and 70 g/m ² or less, for example, from the viewpoint of uniformity, feel, absorbency, etc.

The weight composition ratio of the spunbond nonwoven fabric and the pulp fiber web in the composite nonwoven fabric is, for example, 40/(weight of the spunbond nonwoven fabric/weight of the pulp fiber web) from the viewpoint of absorbency and diffusibility of body fluids. It is 60% by weight or more and 10/90% by weight or less. By setting it within this range, the support of the pulp fiber web by the spunbond nonwoven fabric and the absorbency of the pulp fiber web can be achieved at a high level in a well-balanced manner, which is effective in preventing side leakage of body fluids.

In addition, in a tensile strength test using Tensilon for composite nonwoven fabrics, the force (tensile strength) required to extend a test piece formed to a width of 25 mm by 2 mm in the longitudinal direction is not particularly limited, but is preferably 1.5 N/25 mm. 5.0N/25mm or less.

The composite nonwoven fabric of this embodiment includes, for example, a step of laminating and integrating a spunbond nonwoven fabric and a pulp fiber web, and pressing and/or pressing the obtained laminate using a roll or the like as necessary. It can be manufactured by a manufacturing method including a step of heating. Alternatively, the spunbond nonwoven fabric and the pulp fiber web may be integrated using an adhesive or by sewing. Further, a composite nonwoven fabric can also be obtained by a manufacturing method including a water jet entanglement step in which pulp fibers constituting a pulp fiber web are injected together with a water jet (water stream) onto a spunbond nonwoven fabric. The composite nonwoven fabric may be embossed.

Among the above-mentioned manufacturing methods, a method using a hydroentangling method is preferable from the viewpoint of achieving both softness in appearance and feel and strength. In the hydroentangling process, from the viewpoint of balance between appearance, softness of touch, and efficiency, it is preferable that the hole diameter Φ of the water jet nozzle that sprays the water jet is 0.06 mm or more and 0.15 mm or less; It is preferable that the interval is 0.4 mm or more and 1.0 mm or less.

The composite nonwoven fabric of this embodiment is arranged such that the pulp fiber web is in contact with the non-skin side surface of the absorbent body 12 and the spunbond nonwoven fabric is in contact with the skin side surface of the backsheet 11 from the viewpoint of improving body fluid dispersibility. However, it is also possible to maintain almost the same liquid diffusivity even in the opposite case.

(3D gathers)
The three-dimensional gathers 14 are provided, for example, to prevent side leakage of bodily fluids excreted by the user of the absorbent article 1. In the three-dimensional gathers 14 of this embodiment, one end in the width direction is fixed near both ends in the width direction of the skin side of the back sheet 11, and a middle part in the width direction is fixed near both ends in the width direction of the skin side of the top sheet 10, It includes a three-dimensional gather sheet 14b whose other end in the width direction is a free end, and an elastic stretchable member 14a that is disposed near the other end (free end) in the width direction of the three-dimensional gather sheet 14b and extends in the longitudinal direction. By disposing the elastic stretchable member 14a, the free end is given erectability and can be configured to be deformable according to the wearer's body shape. In this embodiment, the elastic stretchable member is disposed at the other end in the width direction of the three-dimensional gather sheet, but the present invention is not limited to this, and the elastic stretchable member may not be disposed. The fixing position of the three-dimensional gather sheet is not limited to this embodiment, and includes, for example, near both ends in the width direction on the skin side or non-skin side of the top sheet 10 along the longitudinal direction of the absorbent article 1, including the absorber 12. It may be near both ends in the width direction of the bag body of the top sheet 10 and the back sheet 11, near both ends in the width direction on the skin side of the top sheet 10, etc.

As the elastic elastic member 14a for three-dimensional gathers, for example, a polyurethane thread, a band-shaped polyurethane film, a thread-like or band-like natural rubber, etc. are used, and as the three-dimensional gather sheet 14b, a water-repellent or liquid material made of hydrophobic fiber is used. Impermeable nonwoven fabrics such as spunbond nonwoven fabrics, meltblown nonwoven fabrics, and three-layer laminated composite nonwoven fabrics of spunbond nonwoven fabrics/meltblown nonwoven fabrics/spunbond nonwoven fabrics are used. Note that the absorbent article 1 of this embodiment also includes an embodiment that does not include the three-dimensional gathers 14.

<Method for manufacturing absorbent articles>
The method for manufacturing the absorbent article 1 is not particularly limited, and any conventionally known method can be adopted. The top sheet 10 and the back sheet 11 are laminated in order, and the top sheet 10 and the back sheet 11 are fixed partially or entirely using hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc., and then the three-dimensional gathers 14 are formed into a predetermined shape. By fixing it in position, the absorbent article 1 can be manufactured. Then, after wrapping this individually in a package, it may be folded into three in the longitudinal direction.

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 above embodiments, and various changes or improvements can be made to the above embodiments. It is clear to the person skilled in the art that this is possible. 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.

1 Absorbent article 10 Top tote 11 Back sheet 12 Absorbent body 13 Liquid diffusing sheet 14 Three-dimensional gathers 14a Elastic stretchable member 14b Three-dimensional gathers sheet 30 First opening 30A, 30B Third opening 31 Second opening

Claims (6)

An absorbent article comprising a liquid-permeable topsheet, a liquid-impermeable backsheet, and an absorbent body disposed between the topsheet and the backsheet,
The absorbent body has at least one first opening extending in the longitudinal direction in the width direction,
Further comprising a liquid-diffusing sheet disposed between the absorbent body and the backsheet,
The liquid diffusing sheet includes a composite nonwoven fabric comprising a spunbond nonwoven fabric and a pulp fiber web integrated on the surface of the spunbond nonwoven fabric, and has a second opening extending in the longitudinal direction in the width direction. have at least two or more,
The absorbent article, wherein the number of the second openings is greater than the number of the first openings. The absorber is
Equipped with multiple absorbent layers stacked in the thickness direction,
Each of the plurality of absorbent layers has a third opening extending in the longitudinal direction, and the third opening of the plurality of absorbent layers communicates in the thickness direction to form the first opening. The absorbent article according to claim 1. The third openings of the plurality of absorbent layers have center lines in the width direction aligned with the thickness direction, and the third openings of the absorbent layer located on the top sheet side are located on the back sheet side. The absorbent article according to claim 2, wherein the widthwise dimension is smaller than the third opening of the absorbent layer. According to any one of claims 1 to 3, wherein the widthwise dimension of the first opening is 5 mm or more and 50 mm or less, and the widthwise dimension of the second opening is 1 mm or more and 15 mm or less. Absorbent article as described. The absorbent according to any one of claims 1 to 4, wherein the liquid diffusive sheet has a plurality of second openings in the width direction, and an interval in the width direction of the second openings is 30 mm or less. Sex items. The absorbent article according to any one of claims 1 to 5, wherein the length of the second opening is 50% or more and 95% or less of the total length of the liquid diffusive sheet in the longitudinal direction.