JP6705103B2 - Absorbent article - Google Patents

Description

The present invention relates to absorbent articles.

Generally, absorbent articles such as taped paper diapers, pants-type paper diapers, urine absorbing pads, light incontinence pads, sanitary products, etc., have a liquid-permeable top sheet, a liquid-impermeable back sheet, and a space between them. And an absorber arranged. Of these, the urine absorbing pad is commonly used as a so-called inner pad, which is used by putting it in a taped paper diaper or a pants-type paper diaper. The combined use of a disposable diaper and a urine absorbing pad is often used by a wearer who is unable to stand up by himself, so that the urine absorbing pad cannot be frequently replaced. Therefore, there is a demand for an absorbent article that can be absorbed even if it is excreted a plurality of times, has a large absorption amount, and has an improved absorption rate.

By the way, it has been proposed that some absorbent articles are provided with notches such as slits in a part of the absorber to improve the absorption performance and prevent leakage. For example, in Patent Document 1, in an absorbent body in which a fiber layer and a particle layer mainly composed of superabsorbent polymer particles are laminated, the absorbent body is divided in the front-rear direction of a diaper, and the particle layers are seen on side surfaces facing each other. Such a diaper is disclosed.

Further, in Patent Document 2, a slit extends at least between the central portion in the width direction and the left and right side edge portions of at least the crotch portion of the absorber, and the top sheet has both groove portions of the absorber or the width direction outer side vicinity thereof. The three-dimensional gather is provided along the slit with the position overlapping with as the root portion, and at least the side portion on the width direction center side of both groove portions of the absorber is located on the width direction center side with respect to the root portion of the three-dimensional gather. , A pad type absorbent article is disclosed.

However, although the absorption performance for the crotch part is improved by providing such a slit in the absorber, the liquid diffusibility of the absorber before and after the crotch part has not been taken into consideration. That is, body fluid such as urine flows into the slit of the absorbent body through the top sheet and diffuses in the slit, but depending on the relationship between the excreted site and the position of the slit, the body fluid is in the front-back direction of the absorbent body. It did not diffuse well, and accumulated on the surface of the absorber, which sometimes caused leakage from the edge of the absorber. Especially in the case of a urine absorbing pad, the width of the absorber differs in the front-back direction, and the front part of the absorber is often narrower than the rear part. The bodily fluid thus reached could reach the edge of the absorber at the front side prematurely and cause leakage. Furthermore, there is still room for improvement in terms of fit.

JP-A-11-216161 JP, 2011-156032, A

In view of the above problems, the present invention controls the liquid diffusibility with a slit portion provided in the absorbent body, thereby effectively utilizing the entire absorbent body to prevent leakage, and an absorbent article excellent in fit as well. The purpose is to provide.

(1) One aspect according to the present invention is an absorbent article,
Liquid-permeable topsheet,
Liquid impermeable back sheet,
An absorber disposed between the top sheet and the back sheet,
The absorber has a front part, a crotch part, and a rear part,
A pair of left and right first slits extending in the longitudinal direction are formed in the crotch part,
A second slit is formed in the rear portion on the center side in the width direction,
The absorbent body includes a first absorbent member, and a second absorbent member provided on the non-skin contact surface side of the first absorbent member,
In the first absorbing member, the pair of left and right first slits and the second slit are formed,
In the second absorbing member, at least a third slit having an outer shape of the same shape, which is arranged on the outer side in the width direction with respect to the first slit of the left and right pair, is formed.
Each of the pair of left and right first slits has a front slit portion, a central slit portion, and a rear slit portion formed continuously.
The front slit portion is curved so as to be directed inward in the width direction,
The central slit portion extends parallel to each other along the longitudinal direction,
The rear slit portion is curved so as to extend outward in the width direction,
The second slit has a substantially kite shape, and among the four sides divided by two diagonal lines, two sides on the rear side in the longitudinal direction of the absorbent article are two sides on the front side in the longitudinal direction. It is characterized by being longer than.
(2) In the absorbent article according to (1) above, the central slit portions have a minimum separation distance of 30 mm or more from each other, and the central slit portion or the rear slit portion has a minimum separation distance of 20 mm or more from the absorbent body side edge portion. It is characterized by having a distance.

ADVANTAGE OF THE INVENTION According to this invention, by controlling a liquid diffusibility with the slit part provided in the absorber, it is possible to effectively utilize the entire absorber to prevent leakage, and to provide an absorbent article excellent in fit. You can

It is the development view which looked at the absorptive article concerning this embodiment from the top sheet side. It is a top view which shows a pair of 1st slit on either side. (A) is a schematic diagram showing liquid diffusibility in a female wearer. (B) is a schematic diagram showing liquid diffusibility in a male wearer. It is a schematic sectional drawing of the absorbent article in the AA line of FIG. It is a schematic sectional drawing of the absorbent article concerning other embodiment in the AA line of FIG. It is a schematic sectional drawing of the absorbent article in the BB line of FIG.

A mode for carrying out the present invention (hereinafter, referred to as “embodiment”) will be described in detail with reference to FIGS. 1 to 6. In the description of the embodiments, the same elements are given the same numbers throughout. In the description of the present specification, “when the absorbent article is worn” means at least one of when the absorbent article is worn and after it is worn. In addition, the longitudinal direction of the absorbent article is a direction extending in the front and back of the wearer when the absorbent article is worn. Further, the width direction of the absorbent article is a direction that is lateral or orthogonal to the longitudinal direction. Further, the skin contact surface is a surface of the front and back surfaces of each member such as an absorber that is arranged on the skin side of the wearer when worn, and the non-skin contact surface is each member such as a back sheet. Of the front and back surfaces, the surface facing away from the wearer's skin side when worn. Bodily fluid refers to a liquid such as urine, blood or water in loose stool that is discharged from the body to the outside. The absorbent article may be a tape-fastened disposable diaper, a pants-type disposable diaper, a urine absorbing pad, a light incontinence pad, a sanitary article, etc., regardless of whether it is for infants or adults.

FIG. 1 is a development view of the absorbent article 1 according to the present embodiment viewed from the top sheet 21 side. The absorbent article 1 includes a liquid-permeable topsheet 21 arranged on the skin contact surface side, a liquid-impermeable backsheet 23 arranged to face the topsheet 21, a topsheet 21, and a backsheet. 23 and at least one layer of the absorber 22 disposed between the two. The method for manufacturing the absorbent article 1 is not particularly limited, and a conventionally known method can be adopted.

In addition, the absorbent article 1 has a pair of elastic members 24 a for three-dimensional gathers on the top sheet 21 along the longitudinal direction of the absorbent article 1 in order to prevent lateral leakage of body fluid excreted by the user. The three-dimensional gather 24 may be provided. The outer ends of the three-dimensional gathers 24 in the lateral direction of the absorbent article 1 are fixed to the backsheet 23, and the inner ends thereof are fixed to the topsheet 21 at both ends in the longitudinal direction of the absorbent article 1. At the center in the longitudinal direction of 1, the three-dimensional gather sheet 24b is arranged so as to be a free end that is not fixed to the top sheet 21. By providing the elastic member 24a for three-dimensional gathers along the longitudinal direction, the elastic member 24a is provided so as to be upright and deformable according to the wearer's body shape. As the elastic member 24a for three-dimensional gathers, for example, a polyurethane thread, a strip-shaped polyurethane film, a thread-shaped or strip-shaped natural rubber, or the like is used. A liquid non-woven fabric, for example, a spun bond non-woven fabric, a melt blown non-woven fabric, a spun bond/melt blown/spun bond laminated non-woven fabric, or the like is used.

(Top sheet)
For the top sheet, a base material having liquid permeability that allows body fluid to move to the absorber may be used. For example, non-woven fabric such as thermal bond non-woven fabric, composite non-woven fabric in which thermal bond/spun bond is laminated, open polyethylene film. And the like, a foamed film such as polyethylene foam and urethane foam, or a composite sheet in which these are laminated. Moreover, in order to improve the liquid permeability, the top sheet is preferably embossed or perforated on its surface. As the processing method, known methods can be used without limitation. Further, in order to reduce the irritation to the skin, it is also preferable that the top sheet contains a lotion, an antioxidant, an anti-inflammatory component, a pH adjusting agent, an antibacterial agent, a moisturizing agent and the like. Further, from the viewpoint of strength and workability, the basis weight of the top sheet is preferably 15 g/m ² or more and 40 g/m ² or less. The shape of the top sheet is not particularly limited, but may be any shape that covers the absorbent body in order to guide the body fluid to the absorbent body so as not to leak.

(Back sheet)
The backsheet may be made of a material such as a non-woven fabric, a resin film, or a composite sheet in which these are laminated, as long as the backing sheet has a liquid impermeable base material that prevents the body fluid held by the absorber from leaking to the underwear. It The production method of the nonwoven fabric is not particularly limited, and examples thereof include spunbond and meltblown nonwoven fabrics, spunbond/meltblown, spunbond/meltblown/spunbond laminated non-woven fabrics, and composite materials thereof. Examples of the resin film include polyester, polyvinyl alcohol, polyethylene, polypropylene, a composite film of polyethylene and polypropylene, and the like.

From the viewpoint of strength and workability, the basis weight of the back sheet is preferably 15 g/m ² or more and 40 g/m ² or less. Further, in order to prevent stuffiness during mounting, it is preferable that the back sheet has breathability. In order to provide air permeability, for example, a resin film as a base material may be mixed with a filler, or a back sheet may be embossed. As the filler, calcium carbonate can be used, and the processing method thereof can be performed by a publicly known method without limitation.

(Absorber)
The absorber 22 has at least one layer disposed between the top sheet 21 and the back sheet 23, and has a front portion 31, a rear portion 33, and a crotch portion 32 disposed between the front portion 31 and the rear portion 33. ing. Here, the "inseam" means a portion corresponding to the inseam of the body when worn. Further, the "front part" means a part in front of the "crotch part", that is, in the ventral direction, and the "rear part" is behind the "crotch part", that is, the back side. It means the part in the direction of.

As shown in FIG. 1, a pair of left and right first slits 43 extending in the longitudinal direction are formed in the crotch portion 32 of the absorbent body 22, and a rear portion 33 has a substantially kite-like shape on the center side in the width direction. Second slit 44 is formed. The pair of left and right first slits 43 mainly improves the liquid diffusibility of body fluid, and the second slits 44 mainly improve the absorption performance for feces.

FIG. 2 is a plan view showing the pair of left and right first slits 43. As shown in FIG. 2, the pair of left and right first slits 43 is formed by continuously forming a front slit portion 51, a central slit portion 52, and a rear slit portion 53, respectively. The front slit portion 51 is curved toward the inner side in the width direction, the central slit portion 52 extends parallel to each other along the longitudinal direction, and the rear slit portion 53 is curved toward the outer side in the width direction. By curving the front slit portion 51 in the width direction toward the width direction inner side, the body fluid is guided to the central region of the absorber 22. On the other hand, the rear slit portion 53 is curved so as to extend outward in the width direction, thereby guiding the diffusion of body fluid in the left-right direction of the rear region of the absorber 22. By adopting this configuration of the pair of left and right first slits 43, the absorbent body 22 as a whole can absorb and retain body fluid, as compared with the conventional slits having symmetrical front and rear ends. Further, since the central slit portions 52 extend in parallel to each other along the longitudinal direction, the shape retaining property at the excretion position of the absorbent body 22 and the fit property of the crotch part 32 are improved.

Further, as shown in FIG. 1, the second slit 44 formed in the rear portion 33 is formed on the center side in the width direction. The second slit 44 has a substantially kite shape, and among the four sides divided by the two diagonal lines, the two sides on the rear side in the longitudinal direction of the absorbent article are the two sides on the front side in the longitudinal direction. Longer than the edge of.
The second slit 44 acts as a temporary pocket for preventing back leakage due to loose stool or the like at the fecal excretion position LE, and can reduce skin irritation around the anus. By forming a pair of left and right first slits 43 and second slits 44 in the absorbent body 22, comprehensive leakage of body fluid and feces can be prevented.

FIG. 3A is a schematic diagram showing liquid diffusibility in a female wearer. Moreover, FIG.3(b) is the schematic which shows the liquid diffusibility in a male wearer. When the wearer is a woman, the female body fluid excretion position LW exists between the central slit portions 52, and the fecal excretion position LE exists near the second slit 44. The body fluid that has reached the absorbent body 22 from the excretion position LW flows in the front-rear direction from the central slit portion 52, as indicated by the arrow, so that the entire body of the absorbent body 22 can absorb and retain the body fluid. Further, the stool that has reached the absorber 22 from the stool discharge position LE is guided to the second slit 44, as indicated by the arrow. In addition, when the wearer is a male, the bodily fluid discharge position LM of the male is present in the front end portion of the front slit portion 51 or in the front end direction. The fecal excretion position LE exists near the second slit 44 as in the case of a woman. When the body fluid that has reached the absorber 22 from the excretion position LM reaches the front slit portion 51 as shown by the arrow, it quickly flows into the inside of the absorber 22 rearward, and from the side surface and the bottom surface of the first slit 43. It is possible to diffuse into the absorbent body 22 and absorb and retain body fluid in the entire absorbent body 22. This suppresses body fluid from flowing over the surface of the top sheet 21 and reduces wetting of the scrotum.

The pair of left and right first slits 43 has a width of 5 mm or more and 30 mm or less, and a length of the front slit portion 51 of 10 mm or more and 100 mm or less, and a central slit portion 52 of the central slit portion 52, in view of the balance between shape retention and liquid diffusibility. It is preferable that the rear slit portion 53 is 50 mm or more and 200 mm or less and 20 mm or more and 100 mm or less. Further, the angle formed by the extension line of the front slit portion 51 and the central slit portion 52 is preferably 5 degrees or more and 60 degrees or less so as to diffuse to the entire absorber 22, and the extension line of the rear slit portion 53 and the central slit portion 52. The angle formed by and is preferably 10 degrees or more and 90 degrees or less.

In addition, in order to prevent cracking of the absorbent body 22 and improve fitability, in the pair of left and right first slits 43, the central slit portions 52 have a minimum separation distance of 30 mm or more from each other, and the central slit portions 52 or It is preferable that the rear slit portion 53 has a minimum separation distance of 20 mm or more from the side edge portion of the absorber 22. Further, the second slit 44 preferably has a short diagonal of 10 mm or more and 30 mm or less and a long diagonal of 30 mm or more and 100 mm or less in order to suppress skin irritation.

Next, the absorbent article 1 of the embodiment in which the absorber 22 is formed in two layers will be described. FIG. 4 is a schematic sectional view of the absorbent article taken along the line AA of FIG. 1. As shown in FIG. 4, the absorbent body 22 includes a first absorbent member 41 and a second absorbent member 42 provided on the non-skin contact surface side of the first absorbent member 41. In the case of the absorbent article 1 in which the absorber 22 is laminated in two or more layers, it is preferable to form a pair of left and right first slits 43 and second slits 44 on the absorbent member closest to the top sheet 21. A pair of left and right first slits 43 and a second slit 44 are formed in the first absorbing member 41. The second absorbent member 42 absorbs and retains the body fluid and the like flowing from the first absorbent member, and improves the absorption amount of the entire absorbent body 22.

5 is a schematic sectional view of an absorbent article according to another embodiment taken along the line AA of FIG. 1, and FIG. 6 is a schematic sectional view of the absorbent article taken along the line BB of FIG. is there. The 2nd absorption member 42 may be provided with the slit similarly to the 1st absorption member 41, and the position, number, and shape can be formed without particular limitation. Among them, the third slit 45 having the same outer shape arranged outside the pair of left and right first slits 43 in the width direction, or the second slit 44 arranged in the rear portion 33 of the absorber 22. It is preferable that at least one of the fourth slits 46 having a larger area is formed. By forming the third slit 45 having the same outer shape and arranged outside the pair of left and right first slits 43 in the width direction, the capacity as a pocket through which the bodily fluid passes through the liquid diffusible increases, and Diffusivity is improved. Further, by forming the fourth slit 46 that is larger than the area of the second slit 44 arranged in the rear portion 33 of the absorbent body 22, the storage pocket for feces is increased and the leakage of feces is prevented.

The absorber 22 preferably contains a base material and a super absorbent resin (SAP). The base material of the absorbent body 22 is not particularly limited as long as it is generally used for absorbent articles such as sanitary napkins, diapers, and urine pads. For example, fluff pulp, cotton, rayon, acetate, tissue, absorbent paper. , A hydrophilic non-woven fabric or the like. Of these, fluff pulp is preferred from the viewpoint of absorbability. Examples of the fluff pulp include wood pulp, synthetic fibers, polymer fibers, and non-wood pulp defibrated into cotton. In addition, the basis weight of the base material of the absorbent body 22 is preferably 100 g/m ² or more and 800 g/m ² or less so as not to impair the absorption performance and the touch.

In addition, the SAP of the absorbent body 22 is not particularly limited as long as it can absorb body fluids and prevent backflow, and examples thereof include sodium polyacrylate-based, polyaspartate-based, (starch-acrylic acid) grafts. It is formed from materials such as copolymers, (acrylic acid-vinyl alcohol) copolymers, (isobutylene-maleic anhydride) copolymers and saponified products thereof. Among these, sodium polyacrylate type is preferable from the viewpoint of absorption amount per weight. Further, the SAP of the absorbent body 22 preferably has a basis weight of 50 g/m ² or more and 500 g/m ² or less so as not to impair the absorption performance and the touch.

The base material and SAP of the absorber 22 are preferably formed by mixing SAP particles in the base material, or an SAP sheet in which SAP particles are fixed between the base materials. Further, in order to prevent leakage of SAP particles and stabilize the shape of the absorber 22, it is preferable to wrap the absorber 22 in a carrier sheet 47. The base material of the carrier sheet 47 may be any one as long as it has hydrophilicity, and examples thereof include hydrophilic non-woven fabric such as tissue, absorbent paper, and air-laid non-woven fabric. When a plurality of carrier sheets 47 are provided, the base materials of the carrier sheets 47 may be the same or different.

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. It will be apparent to those skilled in the art that various modifications and improvements can be added to the above-described embodiment. It is also apparent from the scope of the claims that the embodiments added with such changes or improvements can be included in the technical scope of the present invention.

1 Absorbent article 21 Top sheet 22 Absorbent body 23 Back sheet 24 Three-dimensional gather 24a Three-dimensional gather elastic member 24b Three-dimensional gather sheet 31 Front part 32 Crotch 33 Rear part 41 First absorbent member 42 Second absorbent member 43 First Slit 44 second slit 45 third slit 46 fourth slit 47 carrier sheet 51 front slit portion 52 central slit portion 53 rear slit portion LM male urination position LW female urination position LE fecal excretion position

Claims (2)

An absorbent article,
Liquid-permeable topsheet,
Liquid impermeable back sheet,
An absorber disposed between the top sheet and the back sheet,
The absorber has a front part, a crotch part, and a rear part,
A pair of left and right first slits extending in the longitudinal direction are formed in the crotch part,
A second slit is formed in the rear portion on the center side in the width direction,
The absorbent body includes a first absorbent member, and a second absorbent member provided on the non-skin contact surface side of the first absorbent member,
The first absorbing member is formed with the pair of left and right first slits and the second slit,
The second absorbing member is formed with at least a third slit having an outer shape of the same shape arranged outside the pair of left and right first slits in the width direction,
Each of the left and right pair of first slits has a front slit portion, a central slit portion, and a rear slit portion formed continuously.
The front slit portion is curved so as to be directed inward in the width direction,
The central slit portion extends parallel to each other along the longitudinal direction,
The rear slit portion is curved so as to extend outward in the width direction,
The second slit has a substantially kite shape, and among four sides divided by two diagonal lines, two sides on the rear side in the longitudinal direction of the absorbent article are two sides on the front side in the longitudinal direction. An absorbent article characterized by being longer than. The central slit portions have a minimum separation distance of 30 mm or more,
The absorbent article according to claim 1, wherein the central slit portion or the rear slit portion has a minimum separation distance of 20 mm or more from the absorbent body side edge portion.

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