JP7171986B2 - absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

In general, absorbent articles such as light incontinence pads, pants-type paper diapers, and tape-fastened paper diapers are composed of a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the two sheets. , consists of As a result, body fluids such as urine pass through the top sheet and are absorbed by the absorbent member, and are prevented from leaking to the outside by the back sheet. Such absorbent articles have been devised in various ways in order to improve absorbency of bodily fluids, improve wearer's wearing comfort, prevent leakage, and the like.

For example, there is a technique for improving absorbent performance such as wet back and absorption speed by providing a perforated film at a predetermined position of an absorbent article. By making the opening area of the perforated film on the skin side larger than that on the non-skin side, wetback and absorption rate are improved.

As an absorbent article using a perforated film, for example, Patent Document 1 discloses an absorbent article having a liquid-permeable surface material, a liquid-retaining absorbent material, and a liquid-impermeable leakage preventive material, wherein the surface The material is at least a liquid-permeable sheet formed by laminating and integrating a skin-contacting surface layer and a non-skin-contacting surface layer, and the skin-contacting surface layer is made of a perforated film made of a thermoplastic resin or a synthetic fiber. An absorbent article is disclosed that is a nonwoven fabric comprising:

Further, Patent Document 2 describes a packaging structure for absorbent articles that allows the absorbent articles to be taken out and put on quickly. Furthermore, in Patent Document 3, an absorbent article is individually packaged with folding assist means extending in the width direction of the absorbent body and having a length that does not cover the entire width of the absorbent body. An individual package of an absorbent article is disclosed in which the bending assisting means has a plurality of folding regions formed at different positions in the longitudinal direction of the absorbent body, and the absorbent article is folded at the sites where the folding regions exist.

JP-A-8-66425 JP 2006-320397 A JP 2009-153735 A

However, although the absorbent article described in Patent Document 1 provided with a perforated film is excellent in preventing liquid backflow such as wet backing and in absorbing speed, it cannot be said to be effective in improving fit to the body. Absorption performance of the absorber is not fully demonstrated. In addition, according to the packaging structure described in Patent Document 2, the absorbent article is folded in the longitudinal direction, so that the absorbent article is compactly and individually packaged, but the improvement in fit to the body is insufficient. Furthermore, it is difficult to say that the individual package of the absorbent article described in Patent Document 3 has excellent absorption performance such as wet back.
Some sanitary napkins and disposable diapers are stored in a folded form from the viewpoint of ease of storage and portability. However, when it is folded, it tends to crease and is difficult to open, and furthermore, the tightness to the underwear and the fit to the crotch area are impaired, leading to poor wearing comfort or leakage.
The present invention has been made in view of the above circumstances, and it is an object of the present invention to provide an absorbent article that is improved in adhesion to underwear and fit to the crotch region, and is excellent in preventing leakage and suppressing liquid return. aim.

As a result of intensive research, the inventor of the present invention found that the above problems can be solved by providing a perforated film having a specific structure between the top sheet and the absorbent body, and completed the present invention. .
That is, the present invention includes a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body disposed between the top sheet and the back sheet, and includes two folds extending in the width direction. An absorbent article that is longitudinally folded along a line and individually wrapped, the absorbent article having a front portion, a crotch portion and a rear portion, wherein the fold line is a boundary portion between the front portion and the crotch portion and the crotch portion. A perforated film having a plurality of openings is disposed between the top sheet and the absorbent body, and the perforated film is stretched in the longitudinal direction. It is an absorbent article that has

The elongation rate of the perforated film is preferably 101% or more and 140% or less.

The perforated film preferably has an aperture diameter of 2 mm or less, a number of apertures of 50/cm ² or more, and a basis weight of 20 g/m ² or more and 60 g/m ² or less.

According to the absorbent article of the present invention, the perforated film is formed by stretching it along the longitudinal direction, and the perforated film improves liquid permeability and suppresses liquid return and stretches in a predetermined longitudinal direction. Since elasticity is generated by molding with the above, both ends in the longitudinal direction of the absorbent article are warped, the adhesion to underwear and the fit to the crotch area are improved, and the absorption is excellent in preventing leakage and suppressing liquid return. You can get a sexual product.

1 is a plan view of an absorbent article of the present invention; FIG. FIG. 2 is a cross-sectional view taken along line X ₁ -X ₁ of FIG. 1;

Modes for carrying out the present invention (hereinafter referred to as embodiments) will be described in detail below with reference to the accompanying drawings, but these are given for the purpose of illustration and are not intended to limit the present invention. do not have. In addition, the same code|symbol is attached|subjected to the same element through the whole description of embodiment.
Moreover, in the description of this specification, when the absorbent article 1 is worn means at least one of when the absorbent article 1 is worn and after the absorbent article 1 is worn. The longitudinal direction of the absorbent article 1 is the direction across the front and back of the wearer when the absorbent article 1 is worn, and is the direction indicated by symbol Y in the drawing. Moreover, the width direction of the absorbent article 1 is a direction that is transverse or perpendicular to the longitudinal direction, and is the direction indicated by symbol X in the drawing. Furthermore, the skin-contacting surface is the surface of the front and back surfaces of each member such as an absorbent body, which is arranged on the wearer's skin side when worn, and the non-skin-contacting surface is each member such as an absorbent body. Of the front and back sides of the , the side facing away from the wearer's skin when worn. Body fluids refer to liquids excreted from the body to the outside of the body, such as urine, blood, and water in loose stools. Further, examples of the absorbent article 1 include, but are not limited to, light incontinence pads, pants-type paper diapers, and tape-fastened paper diapers, regardless of whether they are for babies or adults. There may be.

[Absorbent article]
FIG. 1 is a plan view of an absorbent article 1 according to an embodiment of the present invention, viewed from the top sheet 10 side. 2 is a cross-sectional view taken along line X ₁ -X ₁ in FIG. 1. FIG. As shown in FIGS. 1 and 2, the absorbent article 1 includes a liquid-permeable topsheet 10 arranged on the skin-contacting side and a non-skin-contacting side facing the topsheet 10. a liquid-impermeable back sheet 20; Thereby, the absorbent body 30 has a structure sandwiched between the top sheet 10 and the back sheet 20 .

As shown in FIG. 1, the absorbent article 1 is provided with two folding lines extending in the width direction X at the boundary between the front part a and the crotch part b and the boundary part between the crotch part b and the rear part c. It is It is folded in the longitudinal direction Y along two folding lines 101 and individually packaged. The absorbent article 1 has a front portion a, a crotch portion b and a rear portion c.
Furthermore, in the absorbent article 1 of the present invention, a perforated film having a plurality of openings is arranged between the top sheet 10 and the absorbent body 30, and the perforated film 70 is arranged while being stretched in the longitudinal direction Y. It is
The absorbent article 1 preferably has a longitudinal dimension of 100 mm or more and 800 mm or less and a width direction dimension of 50 mm or more and 500 mm. By adjusting the dimensions of the absorbent article 1 within the above range, it is possible to obtain the absorbent article 1 suitable for light incontinence pads, underpants-type disposable diapers, tape-fastened disposable diapers, and the like.

As shown in FIG. 2, in the absorbent article 1, an elastic member for three-dimensional gathers is provided on the top sheet 10 along the longitudinal direction of the absorbent article 1 in order to prevent lateral leakage of bodily fluid excreted by the user. may be provided with a pair of solid gathers 60 having The outer ends of the three-dimensional gathers 60 in the width direction of the absorbent article 1 are fixed to the back sheet 20, the inner ends are fixed to the top sheet 10, and the center is a free end that is not fixed to the top sheet 10. A three-dimensional gathered sheet is arranged. By providing the three-dimensional gathers elastic member along the longitudinal direction, the three-dimensional gathers 60 can stand upright and deform according to the body shape of the wearer. As the three-dimensional gather elastic member, for example, a polyurethane thread, a band-like polyurethane film, a thread-like or band-like natural rubber, or the like is used. nonwoven fabrics, for example, spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond/meltblown/spunbond laminated composite nonwoven fabrics, and the like are used.
The details of the constituent elements of the absorbent article 1 will be described below.

<Top sheet>
The top sheet 10 may be formed from a liquid-permeable base material that allows body fluids to move to the absorbent body 30. For example, non-woven fabrics such as air-through non-woven fabrics, thermal-bonded non-woven fabrics, spun-bonded non-woven fabrics, thermal-bonded/non-woven fabrics, etc. It is formed from a material such as a composite nonwoven fabric laminated with spunbond, a foamed film such as urethane foam, or a composite sheet laminated with these. In addition, the surface of the top sheet 10 may be embossed or perforated in order to improve liquid permeability. As a method for applying these embossing and perforating processes, known methods can be implemented without limitation. In order to reduce irritation to the skin, the top sheet 10 may contain a lotion, an antioxidant, an anti-inflammatory ingredient, a pH adjuster, an antibacterial agent, a moisturizing agent, and the like.

From the standpoint of strength, workability and liquid return amount, the basis weight of the top sheet 10 is preferably 18 g/m ² or more and 40 g/m ² or less. The shape of the top sheet 10 is not particularly limited as long as it covers the absorbent body 30 required to guide bodily fluids to the absorbent body 30 without leakage.

<Back seat>
The back sheet 20 may be formed using a liquid-impermeable base material that does not allow the body fluid retained by the absorbent body 30 to wet clothes, and may be formed by laminating a resin film or a resin film and a non-woven fabric. It is formed from a material such as a laminated composite sheet. The nonwoven fabric used for the composite sheet is not particularly limited in manufacturing method, and examples thereof include spunbond nonwoven fabrics, meltblown nonwoven fabrics, spunbond/meltblown composite nonwoven fabrics, spunbond/meltblown/spunbond laminated composite nonwoven fabrics, and composite materials thereof. mentioned. Examples of resin films include polyester, polyvinyl alcohol, polyethylene, polypropylene, composite films of polyethylene and polypropylene, and the like.

From the viewpoint of strength and workability, the basis weight of the backsheet 20 is preferably 15 g/m ² or more and 60 g/m ² or less. In addition, it is preferable that the back sheet 20 has air permeability in order to prevent stuffiness at the time of wearing. In order to make the back sheet 20 air-permeable, for example, a filler may be added to the base resin film, or the back sheet 20 may be embossed. Calcium carbonate can be used as a filler, and a known method can be used without limitation as a method for blending the filler.

<Perforated film>
In the absorbent article 1, as shown in FIG. 2, a perforated film 70 having a plurality of perforations is arranged between the top sheet 10 and the absorbent body 30. As shown in FIG. The perforated film 70 preferably has liquid permeability and liquid diffusibility such that bodily fluids move to the absorbent body 30 . The basis weight of the perforated film 70 is preferably 20 g/m ² or more and 60 g/m ² or less, more preferably 23 g/m ² or more and 30 g/m ² or less, from the viewpoint of strength and workability. In terms of liquid permeability, the number of openings is preferably 50/cm ² or more. Furthermore, from the viewpoint of liquid diffusibility, the opening diameter is preferably 2 mm or less, and more preferably 0.50 mm or more and 0.65 mm or less. By setting the number of pores, the diameter of the pores, and the basis weight of the perforated film 70 within the above ranges, it is possible to obtain the perforated film 70 that is excellent in terms of strength and processability, as well as excellent liquid permeability and liquid diffusibility. can. Examples of the material of the perforated film 70 include polyethylene.

Further, the perforated film 70 of the absorbent article 1 of the present invention is stretched and arranged. The elongation rate of the perforated film 70 is calculated from the following formula.
Elongation rate (%) = (dimension of perforated film when stretched in the longitudinal direction)/(dimension of perforated film when not stretched) x 100
The elongation rate of the perforated film 70 is preferably 101% or more and 140% or less, more preferably 105% or more and 120% or less. If it exceeds 140%, the perforated film 70 is broken, which is not preferable.

By disposing the perforated film 70 between the top sheet 10 and the absorbent body 30 and disposing the perforated film 70 on the absorbent body 30 in a stretched state, both ends of the absorbent body in the longitudinal direction are elastically stretched. By warping, it is possible to improve the folding habit, facilitate opening at the time of use, improve fit to the crotch part, and suppress liquid return.

<Absorber>
In the absorbent article 1 of the present invention, the longest longitudinal width dimension LO of the absorbent body 30 is preferably 100 mm or more and 800 mm or less, and more preferably 150 mm or more and 500 mm or less. Further, the longest width dimension WO of the absorbent body 30 in the width direction is preferably 50 mm or more and 500 mm or less, and more preferably 70 mm or more and 105 mm or less. Moreover, as shown in FIG. 2, the absorbent body 30 may be composed of two layers, an upper absorbent body 301 positioned on the skin-contacting side and a lower absorbent body 302 positioned on the non-skin-contacting side. A carrier sheet 50 may be placed between the upper layer absorbent body 301 and the lower layer absorbent body 302 .

(absorbent fiber)
The absorbent body 30 contains absorbent fibers as a base material and a superabsorbent polymer (SAP). Absorbent fibers may be those generally used in absorbent articles such as sanitary napkins, paper diapers, and incontinence pads. can be mentioned. Among these, fluff pulp is preferably used from the viewpoint of absorbability. Examples of fluff pulp include wood pulp (for example, bleached softwood kraft pulp (N-BKP) such as southern pine and Douglas fir), synthetic fiber, resin fiber, non-wood pulp, etc., which are defibrated into cotton. can. When fluff pulp is used as the absorbent fiber as the base material of the absorbent body 30, the basis weight of the absorbent fiber is preferably 100 g/m ² or more and 800 g/m ² or less, and 325 g/m ² or more and 615 g. /m ² or less is more preferable. As a result, more bodily fluids can be absorbed without impairing the feel of the skin.

(super absorbent polymer)
As the superabsorbent polymer of the absorbent body 30, any polymer can be used as long as it can absorb bodily fluids and prevent backflow, such as sodium polyacrylate, polyaspartate, and (starch-acrylic acid) graft copolymer. , (acrylic acid-vinyl alcohol) copolymer, (isobutylene-maleic anhydride) copolymer and saponified products thereof. Among these, the sodium polyacrylate type is preferable from the viewpoint of the absorption amount per weight.

The basis weight of SAP contained in the absorbent body 30 is preferably 240 g/m ² or more and 450 g/m ² or less, more preferably 245 g/m ² or more and 445 g/m ² or less. By setting the basis weight of SAP within the above numerical range, gel blocking in the absorbent body 30 can be prevented, and a large amount of body fluid can be absorbed in the absorbent body 30 .
In addition, in the absorbent body 30, the ratio of the weight of the superabsorbent polymer to the weight of the fluff pulp, that is, the weight of the superabsorbent polymer/the weight of the fluff pulp×100 (%), is 40% or more and 120% or less. is preferred, and 50% or more and 100% or less is more preferred.

In the absorbent body 30, the absorbent fibers and the SAP may be formed by mixing SAP particles in the absorbent fibers, or may be an SAP sheet in which the SAP particles are fixed between the absorbent fibers. Further, the absorbent body 30 may be wrapped in a carrier sheet 50 for the purpose of preventing leakage of SAP particles and stabilizing the shape of the absorbent body 30 . The base material of the carrier sheet 50 may be any material as long as it is hydrophilic, and examples thereof include hydrophilic nonwoven fabric such as tissues, absorbent paper, and air-laid nonwoven fabric. When a plurality of carrier sheets 50 are provided, the substrates of the plurality of carrier sheets 50 may be the same or different.

<second seat>
In the present invention, as shown in FIG. 2, between the top sheet 10 and the perforated film 70, the liquid diffusibility of the absorbent article 1 is improved, the hardness of the perforated film 70 is suppressed, and the texture is improved. In order to improve the liquid diffusing second sheet 40 is preferably arranged.
The base material of the second sheet 40 may be any material that has a faster permeation rate of body fluids than the top sheet 10 and quickly diffuses the body fluids into the absorbent body 30. For example, a hydrophilic nonwoven fabric is preferable, and an air-through nonwoven fabric is particularly preferable. The second sheet 40 preferably has a thickness of 0.1 mm or more, and a basis weight of 10 g/m ² or more and 60 g/m ² or less, more preferably 15 g/m ² or more and 40 g/m ² or less. If the thickness is less than 0.1 mm, or the basis weight is less than 10 g/m ² or greater than 60 g/m ² , the liquid will not sufficiently spread over the entire upper surface of the absorbent body 30 . Moreover, the shape of the second sheet 40 is preferably a shape that can completely cover the surface of the absorbent body 30 so that bodily fluids are diffused all over the absorbent body 30 .

Although the present invention has been described using the embodiments, it goes without saying that the technical scope of the present invention is not limited to the scope described in the above embodiments and examples. It is obvious to those skilled in the art that various modifications or improvements can be made to the above embodiments. In addition, it is clear from the description of the scope of the claims that forms with such modifications or improvements can also be included in the technical scope of the present invention.

Hereinafter, the present invention will be described in detail with reference to examples. It should be noted that the present invention is by no means limited to the examples shown below.
[Example 1]
(Production of absorbent article)
An absorbent article having the configuration shown in FIG. 2 was produced. The upper and lower absorbent layers were formed by mixing 7 g of fluff pulp as a base material with 6 g of SAP. An air-through nonwoven fabric (basis weight: 25 g/m ² ) was used as the liquid-permeable top sheet. A breathable polyethylene sheet (basis weight: 32 g/m ² ) was used as the liquid-impermeable back sheet. An air-through nonwoven fabric (basis weight: 30 g/m ² ) was used as the second sheet. A spunbond/meltblown/spunbond laminated composite nonwoven fabric (basis weight: 15 g/m ² ) was used as the three-dimensional gather. A carrier sheet made of wood pulp (basis weight: 16 g/m ² ) was used between the upper layer absorbent body and the lower layer absorbent body. A perforated film (basis weight: 26 g/m ² ) was placed under the second sheet.
The dimensions of the absorbent article were 273 mm in the longitudinal direction and 105 mm in width. The dimensions of the absorbent body were 245 mm in the longitudinal direction and 89 mm in width.
Furthermore, when integrating the top sheet, the back sheet, and the absorbent body, the top sheet and the upper surface of the absorbent body were joined using a hot-melt adhesive to produce an absorbent article.
The elongation rate (%) of the perforated film was calculated from the above formula.

[Example 2, Comparative Examples 1 and 2]
An absorbent article was produced in the same manner as in Example 1, except that the details of the absorbent article and absorbent body were changed as shown in Table 1.

[evaluation]
The fit, the feel of the surface of the absorbent article, the absorption speed, and the liquid return amount of the produced absorbent article were evaluated. Table 2 shows the results obtained.

(Ease of sticking to underwear)
A panel of 20 people surveyed the ease of attaching the absorbent article to underwear by selecting either “easy to attach”, “neither”, or “difficult to attach”, based on the following criteria. and evaluated.
◎: 16 or more and 20 or less "easy to stick" ○: 11 or more to 15 or less "easy to stick" △: 6 or more to 10 or less "easy to stick" ×: 1 5 people or more

(fitness)
A panel of 20 people investigated the fit of the absorbent article when wearing it by selecting either "good fit", "neither", or "poor fit", and based on the following criteria: made an evaluation.
◎: 16 to 20 people with “good fit” ○: 11 to 15 people with “good fit” △: 6 to 10 people with “good fit” ×: “fit” There is no "is good", 1 or more and 5 or less

(Skin feel of absorbent article surface)
Eight panelists evaluated the feel of the surface of the absorbent article. When the number of evaluators who touched the surface of the absorbent article and "felt soft" was 6 or more and 8 or less, "○" was given, and when the number of evaluators who "felt soft" was 3 or more and 5 or less, "△" was given. A case where one or two evaluators "felt soft" or no evaluator "felt soft" was evaluated as "x".

(Absorption rate)
A measuring jig having a hole with an inner diameter of 19 mm and a weight of ^755.6 g was placed on the central part of the absorbent article 1 in the longitudinal direction and the width direction. , 40 ml of physiological saline was dropped from the upper hole, and the time was measured from the time when the physiological saline came into contact with the absorbent article 1 to the end point when the liquid was completely sucked into the circumference of the jig center circle. .

(Liquid return amount)
With the top sheet facing upward, pour 120 ml of physiological saline toward the center of the absorbent body and leave it for 10 minutes. No. 2 filter paper, diameter 55 mm) was placed, a weight of 35 kgf/cm ² was placed on it, and after 30 seconds had passed, the weight of the filter paper was measured, and the difference in the weight of the filter paper was defined as the liquid return amount.

From the results in Table 2, Examples 1 and 2, in which the perforated films are stretched and arranged, are easy to apply to underwear because they are easy to improve creases, are excellent in fit to the body, have excellent absorption speed, and do not return liquid. I found it difficult.
On the other hand, in Comparative Example 1, which does not contain a perforated film, the absorbent article has a strong crease, so it is inferior in ease of application to underwear, fit, surface texture, and simulated urine (physiological saline) absorption rate. The return amount was also large. In addition, in Comparative Example 2, in which a perforated film was included but the perforated film was not stretched, it was difficult to attach to underwear due to the crease of the absorbent article, and the fit was poor.
ADVANTAGE OF THE INVENTION According to the absorbent article of the present invention, an absorbent article is provided in which, when receiving liquid from urination or the like, the absorbent article is quickly wetted and spread, thereby improving diffusibility and liquid permeability, and improving the liquid backflow prevention property. can do.

1 Absorbent Article 10 (Liquid Permeable) Top Sheet 101 Folding Line 20 (Liquid Impermeable) Back Sheet 30, 301, 302 Absorber 40 Second Sheet 50 Carrier Sheet 60 Solid Gather 70 Perforated Film a Front Part b Crotch Area c rear

Claims (2)

It comprises a liquid-permeable top sheet, a liquid-impermeable back sheet, and an absorbent body arranged between the top sheet and the back sheet, and is folded in the longitudinal direction by two fold lines extending in the width direction. An absorbent article that is individually wrapped by
having a front portion, a crotch portion and a rear portion;
The folding line is provided at a boundary portion between the front portion and the crotch portion and at a boundary portion between the crotch portion and the rear portion,
A perforated film having a plurality of openings is disposed between the top sheet and the absorbent body, and the perforated film is disposed while being stretched in the longitudinal direction.,
The elongation rate of the perforated film is 101% or more and 140% or less absorbent article. The absorbent according to claim 1, wherein the perforated film has an aperture diameter of 2 mm or less, a number of apertures of 50/cm ² or more, and a basis weight of 20 g/m ² or more and 60 g/m ² or less. Goods.

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