JP2021119879A - Absorbent article - Google Patents

Abstract

To provide an absorbent article excellent in body liquid diffusibility and repeating absorbency.SOLUTION: An absorbent article 1 includes: a liquid permeable top sheet 10; a liquid impermeable back sheet 11; an absorber 12 arranged between the top sheet 10 and the back sheet 11; and a liquid diffusive sheet 13 which has at least one or more absorbers 12 and first openings 30 extending in a longitudinal direction in a width direction and is arranged between the absorber 12 and the back sheet 11. The liquid diffusive sheet 13 includes composite nonwoven fabric provided with spunbonded nonwoven fabric and a pulp fiber web integrated with the surface of the spunbonded nonwoven fabric, and has at least two or more second openings 31 extending in the longitudinal direction in the width direction. The number of the second openings 31 is larger than that of the first openings 30.SELECTED DRAWING: Figure 1

Description

The present invention relates to absorbent articles.

A typical absorbent article is composed of a liquid permeable top sheet, a liquid permeable back sheet, and an absorber arranged between them. On the other hand, in absorbent articles used for moderate to severe long-term care, a large amount of fluff pulp and a highly absorbent polymer are used to absorb multiple urinations that occur repeatedly during long-term wear such as at night. Must adopt a large size absorber using. However, even if a large-sized absorber is adopted, the absorption site of body fluid such as urine tends to be limited to the urination site and its surroundings, and the absorber in the peripheral portion away from the urination site often does not contribute to absorption. ..

In order to solve such a problem, many absorbent articles have been proposed that improve the diffusivity of body fluids such as urine in the absorber and keep the wearer's comfort, particularly the surface of the top sheet dry. For example, Patent Document 1 states that in order to improve the diffusivity of body fluid in an absorber, a hydrophilic fiber web is provided between a liquid permeable top sheet and an absorber containing fluff pulp, a highly absorbent polymer, and the like. It discloses that a liquid diffusible sheet consisting of a hydrophobic fiber web and a hydrophobic fiber web is arranged.

Japanese Unexamined Patent Publication No. 3-234255

However, in an absorbent article such as a high-absorption amount urine absorbing pad, the diffusibility and absorbability of body fluid such as urine are not sufficiently satisfactory even if various conventionally proposed techniques are used.

An object of the present invention is to provide an absorbent article having excellent body fluid diffusibility and repetitive absorbability.

As a result of intensive research to solve the above problems, the present inventor has placed a predetermined liquid diffusible sheet between the absorber and the back sheet, and made a predetermined change to the liquid diffusible sheet and the absorber. By applying this, a desired absorbent article was successfully obtained, and the present invention was completed. The present invention provides, for example, the following absorbent articles (1) to (6) as preferred embodiments.

(1) An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber arranged between the top sheet and the back sheet.
The absorber has at least one first opening extending in the longitudinal direction in the width direction.
A liquid diffusible sheet disposed between the absorber and the back sheet is further provided.
The liquid diffusible sheet comprises a composite nonwoven fabric comprising a spunbonded nonwoven fabric and a pulp fiber web integrated on the surface of the spunbonded nonwoven fabric, and has a second longitudinally extending opening in the width direction. Have at least two
An absorbent article in which the number of the second openings is greater than the number of the first openings.
(2) The absorber includes a plurality of absorption layers laminated in the thickness direction, each of the plurality of absorption layers has a third opening extending in the longitudinal direction, and the first of the plurality of absorption layers. The absorbent article according to (1) above, wherein the three openings communicate with each other in the thickness direction to form the first opening.
(3) The center line in the width direction of the third opening of the plurality of absorption layers coincides with the thickness direction, and the third opening of the absorption layer located on the top sheet side is the back sheet. The absorbent article of (2) above, which is smaller in width direction than the third opening of the absorbent layer located on the side.
(4) 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 of the absorbent articles.
(5) Any of the above (1) to (4), wherein the liquid diffusible sheet is provided with a plurality of the second openings in the width direction, and the distance between the second openings in the width direction is 30 mm or less. Absorbent article.
(6) The absorbency according to any one of (1) to (5) above, wherein the dimension of the second opening in the longitudinal direction is 50% or more and 95% or less of the total length of the liquid diffusible sheet in the longitudinal direction. Goods.

According to the present invention, an absorbent article having excellent body fluid diffusibility and repetitive absorbability is provided.

It is a top view which shows typically the structure of the absorbent article which concerns on 1st Embodiment of this invention. It is a schematic cross-sectional view in the width direction in the XX cutting line shown in FIG. It is a top view which shows typically the structure of the absorbent article which concerns on 2nd Embodiment of this invention. It is a schematic cross-sectional view in the width direction in the XX cutting line shown in FIG.

In the present specification, it is defined as follows. When the absorbent article is worn, it means that the absorbent article is worn on the body before and after the absorption of body fluid. The longitudinal direction of the absorbent article is the direction extending to the front and back of the body through the crotch portion of the wearer when the absorbent article is worn, the width direction is a direction substantially orthogonal to the longitudinal direction, and the thickness direction is the above-mentioned direction. It is a direction substantially perpendicular to a plane including a longitudinal direction and a width direction of, for example, a stacking direction of each component member. Of the front and back surfaces of the absorbent article and each component, the surface in contact with the wearer's skin or the surface facing the wearer's skin is the skin side, and the surface in contact with the wearer's clothing or the surface facing the wearer's clothing. Is the non-skin side. In addition, in all embodiments, components having the same or similar functions and / or effects are designated by the same reference numerals, and the description of the first embodiment is incorporated. Body fluid refers to the liquid excreted from the body such as urine, blood, and water in loose stool.

The absorbent article of the present embodiment can be used as an absorbent article for various purposes regardless of whether it is for babies or adults. Among these, the embodiment in which the absorbent article of the present embodiment is used alone as a urine absorbing pad, the absorbent article of the present embodiment is used as an inner (urine absorbing pad), and various disposable diapers are used as an outer. The embodiment is more preferable. The dimensions of the absorbent article of the present embodiment in the longitudinal direction and the width direction are not particularly limited, but are, for example, 100 mm or more and 800 mm or less, and 50 mm or more and 500 mm or less, respectively. By adjusting the dimensions of the absorbent article of the present embodiment to the above range, it can be used for various purposes.

Hereinafter, the absorbent article 1 of the present embodiment will be described in detail with reference to the drawings. 1 and 3 are schematic plan views showing the absorbent article 1 according to the 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 described so as to be in close contact with each other in the thickness direction, but at least one of the components may have one or more gaps. In addition, each drawing does not define the size relationship, the size, and the shape of the dimensions in the longitudinal direction, the width direction, and the thickness direction of each component member of the absorbent article 1.

<Absorbable article>
The absorbent article 1 of the present 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. , A absorbent body 12 provided between the top sheet 10 and the back sheet 11, a liquid diffusible sheet 13 provided between the back sheet 11 and the absorbent body 12, and a three-dimensional gather 14 are provided for absorption. The body 12 has one or more first openings 30 extending in the longitudinal direction in the width direction, and the liquid diffusible sheet 13 includes a spunbonded non-woven fabric and a pulp fiber web integrated on the surface of the spunbonded nonwoven fabric. It is a composite non-woven fabric containing, and has two or more second openings 31 extending in the longitudinal direction in the width direction, and the number of the second openings 31 is larger than the number of the first openings 30. It is a thing. Here, the first and second openings 30, 31 are through holes that penetrate the absorber 12 and the liquid diffusible sheet 13 in the thickness direction, respectively.

According to the present embodiment, since the predetermined composite non-woven fabric used as the liquid diffusible sheet 13 is excellent in body fluid absorption and body fluid permeability, the body fluid wrapping between the back sheet 11 and the absorber 12 can be efficiently collected. It can lead 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 absorbing component contained in the absorber 12, but is dammed by the swelling of the absorbing component on the surface layer of the absorber 12. Absorption rate may slow down and a sufficient amount of body fluid may not be absorbed. On the other hand, not only the absorber 12 which is relatively close to the skin side but also the liquid diffusible sheet 13 which is relatively separated from the skin side has the first and second openings 30 extending in the longitudinal direction, respectively. , 31 causes a flow of body fluid in the absorber 12, and the body fluid reaches every corner of the absorber 12 without significantly reducing the flow rate, and the absorption component in the absorber 12 is provided. Most or almost all of it is easily utilized for absorption of body fluids. As a result, a good absorbent article having excellent absorption performance that repeatedly absorbs urination many times and maintains the comfort of the wearer for a long time can be obtained.

Therefore, in the present embodiment, by effectively utilizing the absorbing component in the peripheral portion away from the urination site, the fluff pulp and the highly absorbent polymer are not excessively increased, and the urination is repeatedly absorbed many times for a long time. It is possible to provide an absorbent article having excellent absorbent performance that maintains the comfort of the wearer for a long time.

Hereinafter, each of the sheet-shaped or plate-shaped constituent members will be described in detail in the order of the top sheet 10, the back sheet 11, the absorber 12, the liquid diffusing sheet 13, and the three-dimensional gather 14. In addition, each constituent member may have a three-dimensional shape other than a sheet shape and a plate shape.

(Top sheet)
The top sheet 10 is composed of a base material having liquid permeability such that body fluid permeates the top sheet 10 and moves to the absorber 12. Examples of the liquid-permeable base material for the top sheet include non-woven fabrics such as air-through non-woven fabrics, thermal bond non-woven fabrics, and spunbond non-woven fabrics, composite non-woven fabrics in which the same or different types of non-woven fabrics such as thermal bond / spunbond are laminated, urethane foam, and polyethylene. Examples thereof include a foamed film made of foam and the like, a composite sheet which is a laminate of two or more of these, and the like. Among these, hydrophilic non-woven fabrics such as thermal bond non-woven fabrics, spunbond non-woven fabrics, and thermal bond / spunbond composite non-woven fabrics from the viewpoints of transferability of body fluids to the absorber 12 and diffusivity of body fluids in the absorbent article 1. Is preferable.

The surface of the top sheet 10 may be embossed or perforated, for example, in order to improve liquid permeability. The embossing and drilling can be carried out by a known method without limitation. 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 moisturizer and the like.

The basis weight of the top sheet 10 of the present 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, and more preferably 18 g / m ² or more and 40 g. It is less than / m ^2. The shape of the top sheet 10 is not particularly limited, but may be any shape that covers the absorber 12, which is required to guide the body fluid to the absorber 12 so as not to leak.

(Back sheet)
The backsheet 11 is made of a breathable or non-breathable liquid-impermeable substrate that prevents the body fluid held by the absorber 12 from wetting clothing or adhering to the skin surface. Examples of the base material for the back sheet include a resin film, a composite sheet which is a laminate of the resin film and the non-woven fabric, and the like. Examples of the resin film include a film made of a synthetic resin such as polyester, polyvinyl alcohol, polyethylene, and polypropylene, and a composite film of polyethylene and polypropylene. The non-woven fabric used for the composite sheet is not particularly limited in the manufacturing method. Examples thereof include a composite non-woven fabric which is a laminated body with. Among these, a breathable, non-breathable, impermeable plastic film is preferable from the viewpoint of preventing lateral leakage of body fluid.

The basis weight of the back sheet 11 is not particularly limited, but is preferably ^{15 g / m 2} or more and 40 g / m ^{2 or less from the viewpoint of strength and workability.} Further, in order to prevent stuffiness during wearing, it is preferable that the back seat 11 is provided with breathability. The method of imparting breathability to the backsheet 11 is not particularly limited, and a known method can be adopted. For example, a method of making the resin film which is the base material for the backsheet porous, and embossing the base material for the backsheet. There is a method of applying. As an example of the method of making the resin film porous, there is a method of adding a filler to the resin to form a film, and removing the filler from the obtained film. Examples of the filler include inorganic salts such as calcium carbonate.

(Absorber)
As shown in FIGS. 1 and 2, the absorber 12 of the present embodiment is arranged between the top sheet 10 and the liquid diffusible sheet 13, and is a first opening extending in the longitudinal direction in the vicinity of the central portion in the width direction. It has one 30. The first opening 30 penetrates the absorber 12 in the thickness direction. The number of the first openings 30 is not limited to one, and may be two or more. When the absorber 12 has two or more openings 30, the plurality of openings 30 are arranged so as to be substantially parallel in the width direction from the viewpoint of the mechanical strength of the absorber 12, body fluid absorption performance, and the like. It is preferable that it is. The number of the first openings 30, the longitudinal dimension, and the width dimension are not particularly limited, and can be appropriately selected from a wide range according to the mechanical strength inherent in the absorber 12, the dimensions of the absorber 12, and the like. 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 shape in which the diameter gradually increases in the thickness direction from the top sheet 10 toward the liquid diffusing sheet 13, and the diameter gradually increases. It may be provided in a substantially stepped cross-sectional view.

As shown in FIGS. 3 and 4, the absorber 12 of the other embodiment may be a laminated body of a plurality of absorption layers 12a and 12b. In the present embodiment, it is a laminated body of two absorption layers 12a and 12b, but the present invention is not limited to this, and a laminated body of three or more layers may be used. The absorption layers 12a and 12b each have two third openings 30A and 30B extending in the longitudinal direction in the width direction. The two third openings 30A and 30B are arranged substantially parallel to each other in the width direction. The number of the third openings 30A and 30B is two each in the present embodiment, but the number is not limited to this, and may be one or three or more. In this case, the dimensions of the absorption layer 12a on the top sheet 10 side and the absorption layer 12b on the liquid diffusible sheet 13 side in the longitudinal direction and the width direction may be larger than the dimensions of the absorption layer 12b and absorb. The dimensions of the layer 12a may be the same as the dimensions of the absorption layer 12b, and the dimensions of the absorption layer 12a may be smaller than the dimensions of the absorption layer 12b.

Further, it is preferable that the third opening 30A of the absorption layer 12a and the opening 30B of the absorption layer 12b overlap the center lines in the width direction in the thickness direction (vertical direction) and communicate with each other 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 preferably smaller. According to such an embodiment, for example, the utilization ratio of the absorption component in the absorption layer 12a close to the top sheet 10 (the ratio of body fluid absorption of the absorption component) and the absorption component in the absorption layer 12b close to the liquid diffusible sheet 13. There is no big difference in the utilization ratio, and the absorbing component that can withstand repeated absorption can remain substantially uniformly in the entire absorber 12. The number of the third openings 30A and 30B, the longitudinal dimension, and the width direction dimension may be appropriately selected according to the number of the first openings 30, the longitudinal dimension, and the width direction dimension.

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

The absorber 12 of the present embodiment contains an absorbent fiber as a base material and a highly absorbent polymer (SAP). The absorbent fiber is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers and urine absorbing pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper and hydrophilic fiber are used. Examples include rayon. Among these, it is preferable to use fluff pulp from the viewpoint of absorbability. Examples of such fluff pulp include those obtained by defibrating wood pulp, synthetic fiber, polymer fiber, non-wood pulp and the like into a cotton-like shape. The absorbent fiber of the absorber 12 preferably has a basis weight of 50 g / m ² or more and 800 g / m ² or less from the viewpoint of not impairing the absorption performance and the touch.

The highly absorbent polymer (SAP) used for the absorber 12 is not particularly limited as long as it can absorb and retain body fluids and prevent backflow, and polyacrylic acid salts, polyaspartate salts, (polyacrylic acid salts, polyaspartate salts, etc.). Examples thereof include a starch-acrylic acid) graft copolymer, a (acrylic acid-vinyl alcohol) copolymer, a (isobutylene-maleic anhydride) copolymer and a saponified product thereof. Among these, polyacrylate is preferable, and sodium polyacrylate is more preferable, from the viewpoint of the amount of absorption per weight. The highly absorbent polymer may be used alone or in combination of two or more. ^{The SAP amount of the absorber 12 is preferably 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 the absorption performance and the touch. Is preferable.

The form of the absorbent fiber and SAP in the absorber 12 is preferably the form of a laminated mat formed by mixing SAP particles in the absorbent fiber. SAP molded into a fiber form can also be used. 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 one having hydrophilicity, and examples thereof include hydrophilic non-woven fabrics such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets are provided, the base materials of the carrier sheets may be the same or different.

(Liquid diffusible sheet)
The liquid diffusible sheet 13 of the present embodiment is arranged between the absorber 12 and the back sheet 11 and has two or more openings 31 extending in the longitudinal direction and penetrating in the thickness direction. The liquid diffusible sheet 13 of the present embodiment configured in this way wraps around the body fluid reached from the top sheet 10 side of the absorber 12 through the first opening 30 and the side surface of the absorber 12, for example. The flow of the body fluid that has arrived at the above can be adjusted, and the body fluid can be distributed almost uniformly over the entire surface of the absorber 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.

In the liquid diffusible sheet 13, for example, from the viewpoint of improving the diffusivity of the body fluid in the absorber 12, the number of the second openings 31 extending in the longitudinal direction is the number of the first openings 30 in the absorber 12. It is configured to be greater than the number of. More specifically, the liquid diffusible sheet 13 shown in FIGS. 1 and 2 has two second openings 31 extending in the longitudinal direction, and the liquid diffusing sheet 13 shown in FIGS. 3 and 4 extends in the longitudinal direction. It has five second openings 31, and the distance between the first second opening 31 and the second opening 31 adjacent to the second opening 31 in the width direction in the width direction is 30 mm or less. This improves the uniform diffusivity of the body fluid in the absorber 12. The number of the second openings 31 in the width direction in the present embodiment is 2 or 5, but the number is not limited to this, and 2 while considering the strength, shape retention, etc. of the liquid diffusible sheet 13. It can be appropriately selected from any number of pieces or more.

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 diffusible sheet 13. As a result, while maintaining the strength of the liquid diffusible sheet 13 within a practical range, the diffusibility of the body fluid on the liquid diffusible sheet 13 side surface of the absorber 12 is enhanced, and the liquid diffusible sheet 13 side surface of the absorber 12 and the liquid diffusible sheet 13 side surface and Body fluid can be spread over the entire surface layer. Below 50%, the diffusivity of body fluids tends to be inadequate. If it exceeds 95%, the strength of the liquid diffusible sheet 13 and thus the strength of the absorbent article 1 tend to decrease.

The liquid diffusible sheet 13 of the present embodiment includes a composite non-woven fabric. The composite non-woven fabric is an integral product of a spunbonded non-woven fabric and a pulp fiber web. Here, the fact that the spunbonded non-woven fabric and the pulp fiber web are integrated means that, specifically, in normal use, the pulp fibers mainly contained in the pulp fiber web do not easily fall off from the composite non-woven fabric. Means. In particular, when the pulp fibers are water-entangled with the spunbonded non-woven fabric by a water jet, the pulp fibers are very unlikely to fall off from the composite non-woven fabric. As a preferred embodiment of the integrated product, for example, on one surface of the spunbonded nonwoven fabric, a part of the fibers constituting the spunbonded nonwoven fabric and a part of the pulp fibers constituting the pulp fiber web are entangled with each other to be entangled with each other. And the pulp fiber web are firmly adhered to each other, and on the other surface of the spunbonded nonwoven fabric, a part of the pulp fibers penetrates the spunbonded nonwoven fabric in the thickness direction and is exposed. Such an integral body can be obtained, for example, by the water flow confounding method.

As the spunbonded non-woven fabric contained in the composite non-woven fabric, a non-woven fabric produced by a spunbond method, a melt blow method, a flash spinning method or the like can be used without particular limitation, and the fiber material constituting the non-woven fabric is, for example, nylon. Synthetic resins such as (trade name), vinylon, polyester, acrylic resin, polyethylene, polypropylene, and polystyrene can be preferably used. The spunbonded non-woven fabric is produced by using synthetic resin fibers made of these materials, and may contain a plurality of synthetic resin fibers. The basis weight of the spunbonded non-woven fabric is not particularly limited, but is 7 g / m ² or more and 20 g / m ² or less from the viewpoint of tensile strength and softness of touch.

As the pulp fiber web, a non-woven fabric mainly composed of pulp fibers can be used without particular limitation, and a pulp fiber web formed by spraying pulp fibers on the surface of a spunbonded non-woven fabric by a water flow entanglement method may be used. The pulp fiber used here is not particularly limited, but is preferably softwood bleached kraft pulp (NBKP) such as radiata pine, slash pine, southern pine, lodge pole pine, spruce and douglas fur. 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 from the viewpoint of uniformity, tactile sensation, absorbability and the like.

The weight composition ratio of the spunbonded non-woven fabric and the pulp fiber web in the composite non-woven fabric is, for example, 40 / as (weight of spunbonded non-woven fabric / weight of pulp fiber web) from the viewpoint of absorbability and diffusivity of body fluid. It is 60% by weight or more and 10/90% by weight or less. Within this range, the supportability of the pulp fiber web by the spunbonded non-woven fabric and the absorbency of the pulp fiber web are compatible at a high level in a well-balanced manner, which is effective in preventing lateral leakage of body fluid.

Further, with respect to the composite non-woven fabric, the force (tensile strength) required to stretch the test piece formed in a width of 25 mm by 2 mm in the vertical direction in the tensile strength test with Tencilon is not particularly limited, but is preferably 1.5 N / 25 mm. It is 5.0 N / 25 mm or less.

The composite non-woven fabric of the present embodiment has, for example, a step of laminating and integrating a spunbonded non-woven fabric and a pulp fiber web, and pressurizing and / or pressing the obtained laminate using a roll or the like as necessary. It can be produced by a manufacturing method including a heating step. Further, the spunbonded non-woven fabric and the pulp fiber web may be integrated by using an adhesive or by sewing. A composite nonwoven fabric can also be obtained by a manufacturing method including a water flow entanglement step of injecting pulp fibers constituting a pulp fiber web together with a water jet (water stream) onto the spunbonded nonwoven fabric. The composite non-woven fabric may be embossed.

Among the above-mentioned manufacturing methods, a method using a water flow confounding method is preferable from the viewpoint of achieving both softness and strength in appearance and touch. In the water flow entanglement step, the hole diameter Φ of the water jet nozzle for injecting the water jet is preferably 0.06 mm or more and 0.15 mm or less, and the water jet nozzle The interval is preferably 0.4 mm or more and 1.0 mm or less.

In the composite non-woven fabric of the present embodiment, the pulp fiber web is in contact with the non-skin side surface of the absorber 12 and the spunbond non-woven fabric is in contact with the skin side surface of the back sheet 11 from the viewpoint of improving body fluid diffusivity. However, vice versa, it is possible to guarantee liquid diffusivity close to the same.

(Three-dimensional gather)
The three-dimensional gather 14 is provided, for example, to prevent lateral leakage of body fluid excreted by the user of the absorbent article 1. In the three-dimensional gather 14 of the present embodiment, one end in the width direction is fixed near both ends in the width direction of the skin side surface of the back sheet 11, and the middle portion in the width direction is fixed near both ends in the width direction of the skin side surface of the top sheet 10. It includes a three-dimensional gather sheet 14b having a free end at the other end in the width direction, and an elastic elastic member 14a arranged near the other end (free end) in the width direction of the three-dimensional gather sheet 14b and extending in the longitudinal direction. By arranging the elastic elastic member 14a, the free end is provided with erectability, and the elastic elastic member 14a can be configured to be deformable according to the wearer's body shape. In the present embodiment, the elastic elastic member is arranged 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 elastic member may not be arranged. The fixed position of the three-dimensional gather sheet is not limited to the present embodiment, and includes, for example, the absorber 12 along the longitudinal direction of the absorbent article 1 near both ends in the width direction on the skin side surface or the non-skin side surface of the top sheet 10. 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 surface of the top sheet 10.

For example, a polyurethane yarn, a strip-shaped polyurethane film, a filamentous or strip-shaped natural rubber, or the like is used as the elastic elastic member 14a for the three-dimensional gather, and the three-dimensional gather sheet 14b is a water-repellent or liquid formed of hydrophobic fibers. An impermeable non-woven fabric, for example, a spunbonded non-woven fabric, a melt-blown non-woven fabric, a three-layer laminated composite non-woven fabric of spunbonded non-woven fabric / melt-blow non-woven fabric / spunbonded non-woven fabric, or the like is used. The absorbent article 1 of the present embodiment also includes an embodiment that does not include the three-dimensional gather 14.

<Manufacturing method of absorbent articles>
The method for producing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted. For example, from the clothing side, the back sheet 11, the liquid diffusing sheet 13, the absorber 12, and the top sheet 10 can be used. The top sheet 10 and the back sheet 11 are laminated in this order, and after fixing the top sheet 10 and the back sheet 11 with hot melt adhesive, heat embossing, ultrasonic embossing, high frequency embossing, etc. over a part or the entire circumference, the three-dimensional gather 14 is predetermined. By fixing in position, the absorbent article 1 can be manufactured. Then, this may be individually wrapped in a package, and then folded in 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 are made to the above embodiments. It is clear to those skilled in the art that is possible. Further, it is clear from the description of the scope of claims that the form to which such a modification or improvement is added may be included in the technical scope of the present invention.

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

Claims (6)

An absorbent article comprising a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorber disposed between the top sheet and the back sheet.
The absorber has at least one first opening extending in the longitudinal direction in the width direction.
A liquid diffusible sheet disposed between the absorber and the back sheet is further provided.
The liquid diffusible sheet comprises a composite nonwoven fabric comprising a spunbonded nonwoven fabric and a pulp fiber web integrated on the surface of the spunbonded nonwoven fabric, and has a second longitudinally extending opening in the width direction. Have at least two
An absorbent article in which the number of the second openings is greater than the number of the first openings. The absorber is
With multiple absorption layers stacked in the thickness direction,
Each of the plurality of absorption layers has a third opening extending in the longitudinal direction, and the third opening of the plurality of absorption layers communicates with each other in the thickness direction to form the first opening. The absorbent article according to claim 1. The center line in the width direction of the third opening of the plurality of absorption layers coincides with the thickness direction, and the third opening of the absorption layer located on the top sheet side is located on the back sheet side. The absorbent article according to claim 2, wherein the dimension in the width direction is smaller than that of the third opening of the absorbent layer. 3. The absorbent article described. The absorption according to any one of claims 1 to 4, wherein the liquid diffusible sheet is provided with a plurality of the second openings in the width direction, and the distance between the second openings in the width direction is 30 mm or less. Sex goods. The absorbent article according to any one of claims 1 to 5, wherein the dimension of the second opening in the longitudinal direction is 50% or more and 95% or less of the total length of the liquid diffusing sheet in the longitudinal direction.

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