JP2010035581A - Pants type absorbent article - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a pants type paper diaper which is strong while being soft and smooth. <P>SOLUTION: The absorbent article comprises: an absorbent body composed of a top sheet, a back sheet and an absorbent body disposed between them, and extended in the longitudinal direction of the article; and an exterior body configuring the shape of the article and comprising an interior sheet facing the body side and an exterior sheet formed facing it. The exterior sheet or the exterior sheet and the interior sheet are formed of an air-through non-woven fabric composed of fibers of low fineness. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an absorbent article. More particularly, the present invention relates to a fully pants-shaped disposable paper diaper with a smooth and soft texture.

  Conventional pants-type paper diapers often use a spunbonded nonwoven fabric as an inner and outer material constituting the outer shape of the paper diaper. The spunbonded nonwoven fabric has high strength and is effective in preventing tearing when the paper diaper is pulled up particularly when it is mounted. However, the outer surface of the paper diaper tends to be thin and hard. In particular, the side seal portions formed at both ends of the paper diaper are overlapped with each other and sealed on the line, so that they become harder and uncomfortable for the wearer.

An example of an absorbent article using such a spunbonded nonwoven fabric as a back sheet is described in Patent Document 1. In the absorbent article of Patent Document 1, by using a spunbond nonwoven fabric of polypropylene / polyethylene copolymer in the outer cover of the backsheet, it is wear resistant against friction with adjacent objects due to the movement of the wearer. Have come to have. In Patent Document 1, it is described that the back sheet has a soft and smooth feel like a cloth and prevents fluff caused by friction. However, it is thought that the softness of the back sheet described in Patent Document 1 is not sufficient for the wearer's skin.
It is conceivable to use an air-through nonwoven fabric that is softer than such a spunbonded nonwoven fabric. For example, the disposable diaper currently disclosed by patent document 2 uses the heat-fusible fiber nonwoven fabric for an outer sheet | seat. In Patent Document 2, the heat-fusible fiber non-woven fabric is a non-binding self-adhesive heat-fusible fiber non-woven fabric, such as a spunbond nonwoven fabric or a thermal bond nonwoven fabric. Is described that it is manufactured by a through-air method or a calendering method such as embossing. However, although such an air-through nonwoven fabric has softness, its strength is weaker than that of a spunbonded nonwoven fabric, and it is considered that both softness and strength are not compatible. Further, it has been found that the conventional air-through nonwoven fabric has a drawback that the odor during use of the disposable diaper is easily diffused because of increased air permeability.

Patent Application Publication No. Special Table 2002-540816 Japanese Patent Application Publication No. 2004-249079

  The present invention is an interior / exterior material including a sheet that comes in contact with the skin of a wearer that forms the outer shape of an absorbent article such as a disposable diaper, while maintaining softness as compared with a conventional disposable diaper, etc. Thus, it is possible to provide an absorbent article including a complete pants-type paper diaper that can improve the wearer's comfort and does not cause the inconvenience of tearing even during attachment / detachment.

  In order to solve the above-mentioned problem, an underpants-type absorbent article of the present invention comprises an absorbent main body extending in the longitudinal direction of an article, comprising a top sheet, a back sheet, and an absorbent body disposed therebetween. The exterior sheet is composed of an exterior sheet composed of an interior sheet facing the body and constituting the shape of the article, and an exterior sheet formed opposite thereto, and the exterior sheet is formed of an air-through nonwoven fabric composed of low-definition fibers. It is characterized by being.

In a preferred embodiment of the present invention, the interior sheet is also an air-through nonwoven fabric made of low-definition fibers together with the exterior sheet.
In another embodiment of the present invention, the air-through nonwoven fabric is a composite fiber composed of polyethylene and polypropylene or polyethylene and polyester, and the fineness of the first fiber is from 1.0 dtex, which accounts for 50% or more of the total of the composite fiber. It is preferably 1.5 dtex or less, and the fineness of the remaining second fibers is preferably 1.5 dtex to 2.5 dtex.
In a preferred embodiment of the present invention, the fineness of the first fiber is 1.0 dtex, which accounts for 50% of the composite fiber, and the other fineness of the second fiber is 1.5 dtex.
In another embodiment, the fineness of the first fiber of the nonwoven fabric is 1.0 dtex, which accounts for 70% of the composite fiber, and the fineness of the other second fibers is preferably 1.5 dtex.
In another embodiment, it is preferable that the fineness of the first fiber is 1.0 dtex and occupies 80% of the composite fiber, and the other fineness of the second fiber is 1.5 dtex.
In still another embodiment, it is preferable that the fineness of the first fiber of the nonwoven fabric is 1.5 dtex, which accounts for 50% of the composite fiber, and the other fineness of the second fiber is 2.5 dtex.
In still another embodiment, it is preferable that the fineness of the first fiber of the nonwoven fabric is 1.5 dtex, which accounts for 70% of the composite fiber, and the other fineness of the second fiber is 2.5 dtex.
More preferably, the fineness of the first fiber of the nonwoven fabric is 1.5 dtex, which occupies 80% of the composite fiber, and the fineness of the other second fiber is 2.5 dtex.
In a preferred embodiment of the present invention, the exterior body may be weakly water repellent. Moreover, it is preferable that the absorber is wrapped with an antibacterial deodorizing sheet. When the absorber is composed of two layers arranged so as to overlap each other, it is preferable that the two absorbers are wrapped in an antibacterial deodorizing sheet, but only one of them is wrapped in the antibacterial deodorizing sheet, and the other layer May be wrapped with a hydrophilic nonwoven fabric.

  In the pant-type absorbent article according to the present invention, an exterior body composed of an exterior sheet and an interior sheet constitutes the outer shape of the pant-type absorbent article. The exterior sheet and / or interior sheet of the present invention is composed of a nonwoven fabric formed by an air-through manufacturing method, which is composed of a composite fiber of low-definition fibers. By containing 50% or more of the composite fiber with a fineness of 1.0dtex or more and 1.5dtex or less, the fiber fineness of other fibers is reduced from 1.5dtex to 2.5dtex or less, so it is softer than the conventional air-through sheet. , The strength also becomes stronger. Therefore, in the case of a pants-type diaper, since it is attached and detached as it is in normal pants, if the strength of the exterior body that forms the outer shape of the diaper is weak, it may be broken during use or during removal. Since the paper diaper constituted by the exterior body of the invention has strength, it is difficult to cause a problem that the paper diaper is damaged during attachment / detachment or during use. Furthermore, since the fineness of the air-through nonwoven fabric is small, the softness is improved compared to the conventional air-through nonwoven fabric. Giving decreases. Furthermore, it is possible to obtain an effect that the odor from the absorbent body to the exterior body is not easily diffused during use. This is thought to be due to an increase in the number of fibers per area.

  In the following, some preferred embodiments of the present invention will be described with reference to the accompanying drawings. In the following description, the same reference numerals are used for the same components throughout the drawings.

  FIG. 1 is a schematic diagram showing a basic configuration of a complete pants-type diaper 10 according to the present invention. In the present invention, a complete pants-type diaper is a diaper that is formed in a pant shape in advance so that both sides of the diaper are already sealed by various coupling methods and does not need to be fixed with a fixing tape or the like at the time of use. That means. Referring to FIG. 1, seal portions 12 are formed on both side portions of the diaper 10 to form a complete pants shape. The diaper 10 includes a front part 14 corresponding to the wearer's abdomen, a rear part 16 and a crotch part 18 corresponding to the back side. A plurality of waistline gather elastic bodies 34 are formed in order to form a gather at the waistline periphery of the waistline region of the diaper. Further, a plurality of waistline elastic bodies 36 are provided in a substantially parallel state in order to form a gather in the waistline region extending over the wearer's abdomen and back so as to prevent the diaper from falling off during use. . Further, an elastic body 38 is provided in order to form a gather around the leg opening and to prevent leakage of excrement and the like.

  FIG. 2 is a sectional view taken along line XX when the diaper of FIG. 1 is developed. The diaper 10 includes an absorbent main body 20 and a pants-shaped exterior body 28. The absorptive main body 20 is comprised from the top sheet 22, the leak-proof back seat | sheet 26, and the absorber 24 arrange | positioned among these. As can be seen with reference to FIG. 2, the absorbent main body 20 is positioned in the longitudinal direction at a substantially central portion of the diaper 10. The exterior body 28 that forms the outer shape of the pants-type diaper 10 includes an exterior sheet 30 and an interior sheet 32.

  The absorbent 24 may comprise any hydrophilic fiber matrix of a cellulose fluff web, such as a wood pulp fluff, mixed with particles of a superabsorbent material, commonly known as a superabsorbent material. Synthetic fibers or polymer fibers may be used instead of the wood pulp fluff. The superabsorbent particles may be mixed uniformly with the hydrophilic fibers or may be mixed non-uniformly. The mixing rate of the superabsorbent particles may be changed depending on the thickness of the absorber, and the mixing rate of the superabsorbent particles may be changed depending on the part of the absorber. The superabsorbent material is preferably in the form of discrete particles, but may have a variety of geometric shapes. The superabsorbent material may be contained in the absorber 24 in an amount of about 5 to 90% by weight with respect to the weight of the absorber 24.

  The leak-proof back sheet 26 is preferably formed of a material that is impermeable to liquid so as to provide a waterproof function so that liquid held in the absorber 24 does not leak into the underwear. Usually, such a liquid-impermeable leak-proof backsheet 26 can be manufactured from a thin plastic film such as a polyethylene film or another flexible liquid-impermeable material. Moreover, such a leak-proof back sheet 26 may be formed of a microporous air-permeable material so that liquid does not pass through while allowing vapor from the absorber to escape.

  In the pant diaper according to the present invention, the top sheet 22 is preferably made of a material that is liquid permeable and can be isolated from the liquid absorbed by the absorbent body 24 from the skin of the wearer. Specifically, the top sheet 22 is made of porous foam, reticulated foam, perforated plastic film, natural fiber such as wood or cotton fiber, synthetic fiber such as polyester or polypropylene fiber, or a combination of these. It may be formed from a nonwoven web material. However, the material of the topsheet 22 is not limited to these, and is a liquid permeable material that can isolate the wearer's skin from the liquid that is absorbed and retained by the absorber 24. It may be a non-woven fabric.

  The material suitable for the elastic body formed around the waist, the abdomen, and the legs is a strand or ribbon made of a general elastomeric material, or polyurethane, urethane thread rubber, flat rubber, synthetic rubber, natural rubber, elastic film and so on. As a method for attaching these elastic bodies to the sheet, ultrasonic bonding may be performed as is known in the art, or bonding may be performed by a hot melt adhesive using various bonding patterns. It is preferable to join with an agent.

  The exterior body 28 forms the outer shape of the entire paper diaper 10. The exterior body 28 includes an exterior sheet 30 and an interior sheet 32. The exterior sheet 30 and the interior sheet 32 are preferably formed from an air-through nonwoven fabric. However, if the exterior sheet 30 is an air-through nonwoven fabric, the interior sheet 32 may be formed from a general nonwoven fabric. In the present specification, the air-through nonwoven fabric means a nonwoven fabric produced by an air-through manufacturing method. Such an air-through nonwoven fabric is generally characterized by having a bulky and soft texture because the fibers are bent and more complicatedly entangled because gentle and uniform heating with hot air is performed when the fibers are dried. Have

FIG. 3 is a cross-sectional view showing the structure of the crotch part of a pants-type paper diaper showing another embodiment of the present invention. The absorbent body 24 of the absorbent main body 20 in FIG. 3 is arranged in the absorbent main body 20 in a state where it is stacked in two upper and lower stages. Each of the absorbent main bodies 24 is wrapped with an antibacterial deodorizing sheet 40. Since the antibacterial deodorizing sheet 40 wraps the absorbent body 24, there is an effective effect that odor when excrement is absorbed during use can be prevented from diffusing to the outside. Either the upper or lower side of the absorbent main body 24 may be wrapped with a hydrophilic nonwoven fabric. For example, the upper absorbent body can be wrapped with an antibacterial deodorizing sheet, and the lower absorbent body can be wrapped with a hydrophilic nonwoven fabric. As an example of the antibacterial deodorizing sheet, an antibacterial deodorizing sheet formed by adsorbing a metal such as silver or copper onto a zeolite mineral can be used. This sheet can deodorize malodor in a short time due to the adsorption performance of zeolite and reaction with metal ions, and has antibacterial activity against Escherichia coli, Salmonella, Staphylococcus aureus, MRSA, Pseudomonas aeruginosa and the like.
Further, a transfer sheet 42 is disposed between the top sheet 22 and the absorber 24. The transfer sheet 42 facilitates the movement of excrement from the top sheet 22 to the absorber 24, and enhances the excretion absorption performance.
In FIG. 3, a flap 44 is formed, but the flap 44 becomes a three-dimensional gather when in use, and prevents leakage of excrement and the like. Such flaps are well known and will not be described further herein.

  The interior sheet 32 and the exterior sheet 30 constituting the exterior body 28 will be described in more detail. The exterior sheet 30 is formed from an air-through nonwoven fabric. The fiber composition of the air-through nonwoven fabric of the present invention is preferably a composite fiber made of PE (polyethylene) / PP (polypropylene), but the air-through nonwoven fabric is a composite fiber made of PE (polyethylene) / PET “polyester”. In the composite fiber of the present invention, in order to increase flexibility, it is preferable that the fiber has a small diameter, and includes at least 50% of fibers having a fineness of 1.0 dtex or more and 1.5 dtex or less. The fineness of the fiber is preferably 1.5 dtex or more and 2.5 dtex or less, and the composite fiber includes at least 50% or more of fibers having a fineness of 1.0 dtex or more and 1.5 dtex or less. This is because it becomes difficult to mix and card in the nonwoven fabric manufacturing process, and if it is larger than 1.5 dtex, the flexibility is reduced. When the blending ratio is less than 50%, flexibility is lowered.

  The inventors of the present invention have found that a nonwoven fabric formed from such a composite fiber by an air-through manufacturing method has an effect that it has a bulky and soft texture and has strength. This eliminates the drawbacks of conventional air-through nonwoven fabrics that are flexible but low in strength. Therefore, the exterior sheet made of the air-through nonwoven fabric of the present invention is soft and bulky, and the strength is improved, so that the effect is enhanced as a countermeasure against tearing when a diaper is worn. The pants-type paper diaper is different from a diaper having a fastener, and this strength is important in order to attach and detach like a general pant. Moreover, since the softness | flexibility increases, the fault of the conventional heat seal part that the heat seal part of the diaper 10 will become especially hard can be eliminated, and a wearer's discomfort can be improved. Furthermore, the inventors of the present invention have found that the non-woven fabric of the present invention has an effect that the odor of the excrement absorbed by the absorbent can be prevented. Such an advantageous effect is considered to result from an increase in the number of fibers per area by blending 50% or more of short fibers having a fineness of 1.0 dtex to 1.5 dtex or less.

The interior sheet 32 and the exterior sheet 30 can be such an air-through nonwoven fabric, but a spunbond nonwoven fabric made of copolymer fibers may be used. Such a spunbonded non-woven fabric is soft with a slimy feeling and has a different texture from an air-through non-woven fabric.
Further, an air-through nonwoven fabric used for the exterior sheet 30 may be used for the auxiliary sheet 46 for reinforcing the exterior body.
In general, the outer package 28 is preferably water-repellent. However, in the present invention, since the exterior sheet is bulky, it is considered that the sweat of the wearer is absorbed by the non-woven fabric, so that it may be weakly water-repellent. Such weak water repellency can be achieved by adjusting the properties of the oil to the mixed fibers in the process of manufacturing the nonwoven fabric. Furthermore, weak water repellency may be obtained by mixing water-repellent fibers and hydrophilic fibers in order to prevent the exterior body from being stuffy.

  As described above, the exterior sheet 30 made of the nonwoven fabric of the present invention has an effect of preventing odor diffusion, but as illustrated in FIG. 3, at least one of the absorbers 24 is wrapped by the deodorizing sheet 40. Therefore, a deodorizing effect can be further obtained.

表２

Examples A pants-type disposable diaper was prepared by combining each of the nonwoven fabrics 1 to 8 shown in Table 1 with the exterior sheet 30 and the interior sheet 32 of the present invention. Table 2 evaluated softness, strength, and odor by monitoring tests.

Table 1

Table 2

  In Table 1, the nonwoven fabrics 1 to 6 are nonwoven fabrics produced by the air-through manufacturing method having the fiber composition of the present invention. The non-woven fabric of the non-woven fabric 7 is a non-woven fabric by an air-through manufacturing method in which the fiber having a fineness of 2.2 dtex is 70% and the fiber having a 4.9 dtex is 30%, and is outside the range of the non-woven fabric according to the present invention. The nonwoven fabric 8 is a nonwoven fabric that is directly spun from polypropylene and manufactured by spunbonding. The basis weight is almost the same for the non-woven fabrics 1 to 8.

In Table 2, Examples 1 to 7 show the case where the nonwoven fabric produced by directly spinning a conventional polypropylene is used for the interior sheet using the nonwoven fabric produced by the air-through manufacturing method of the present invention, or the interior sheet. In addition, the evaluation results of softness, strength, and odor are shown for the case of using a nonwoven fabric produced by the air-through manufacturing method.
Comparative Examples 1 to 3 are based on a monitor test of an exterior body configured by combining a nonwoven fabric 7 whose fineness of the composite fiber is outside the scope of the present invention and a nonwoven fabric 8 by a spunbond manufacturing method with the exterior sheet and the interior sheet, respectively. It shows an evaluation.

Evaluation was made in four stages of AA, A, B, and C by a monitor test. That is, the evaluation AA is the highest and the evaluation decreases in the order of A, B, and C.
Regarding the softness among the evaluations in Table 2, the evaluation decreases when Example 4 of the Examples is compared with other Examples. In Example 4, the exterior sheet uses the nonwoven fabric 4 and the interior sheet uses the nonwoven fabric 8. Non-woven fabric 4 has a high fineness compared to non-woven fabrics 1, 2, and 3. In addition, the fiber blending ratio of 1.5dtex is 50% and the ratio of 2.5dtex is 50%. The softness is considered inferior due to the use. In terms of strength and odor, Examples 1 to 7 have received almost the same evaluation. About a comparative example, when comparison 2 and 3 are contrasted with the exterior body concerning this invention, it is inferior to softness, and the comparative example 1 is inferior in intensity | strength and an odor.

As described above, the exterior body according to the present invention is significantly more effective than the conventional product in terms of softness, despite having the same or higher effect in the strength of the conventional product. You can see that
As described above, in the embodiments of the present invention, various materials and the like have been described. However, the present invention is not limited to these, and any material can be appropriately selected and adopted as long as it can be replaced.

It is the schematic when seeing from the front of the underpants type diaper concerning the present invention. It is sectional drawing along the XX line when unfolding the diaper of FIG. It is sectional drawing showing the structure of the crotch part of the diaper of this invention which shows another embodiment of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 10 Pants-type diaper 20 Absorbent main body 24 Absorber 28 Exterior body 30 Exterior sheet 32 Interior sheet 34, 36 Elastic body 40 Antibacterial deodorization sheet

Claims (9)

A pants-type absorbent article,
An absorbent main body extending in the longitudinal direction of the article, comprising a top sheet, a back sheet, and an absorbent body disposed therebetween, and an interior sheet facing the body that forms the shape of the article; It consists of an exterior body composed of an exterior sheet formed opposite to this,
A pants-type absorbent article, wherein the exterior sheet is formed from an air-through nonwoven fabric made of low-fineness fibers.   The absorbent article according to claim 1, wherein the interior sheet is an air-through nonwoven fabric made of low-definition fibers.   3. The absorbent article according to claim 1, wherein the air-through nonwoven fabric is a composite fiber composed of polyethylene and polypropylene or polyethylene and polyester, and occupies 50% or more of the entire composite fiber. An absorbent article, wherein the fineness of the fibers is 1.0 dtex to 1.5 dtex or less, and the fineness of the remaining second fibers is 1.5 dtex to 2.5 dtex or less.   The absorbent article according to claim 3, wherein the fineness of the first fiber of the nonwoven fabric is 1.0 dtex and occupies 50% to 80% of the composite fiber, and the fineness of the second fiber other than this is Absorbent article characterized by being 1.5 dtex.   4. The absorbent article according to claim 3, wherein the fineness of the first fiber of the nonwoven fabric is 1.5 dtex and occupies 50% to 80% of the composite fiber, and the fineness of the second fiber other than this is Absorbent article characterized by being 2.5 dtex.   The absorbent article according to claim 1, wherein the exterior body is weakly water-repellent.   The absorbent article according to claim 1, wherein the absorbent body is encased in an antibacterial deodorizing sheet.   The absorbent article according to claim 1, wherein the absorbent body is formed of two layers arranged so as to overlap each other, and each of the absorbent bodies is wrapped with the antibacterial deodorizing sheet. An absorbent article characterized by the above.   The absorbent article according to claim 8, wherein one layer of the absorbent body is wrapped with the antibacterial deodorizing sheet, and the other layer of the absorbent body is wrapped with a hydrophilic nonwoven fabric. Absorbent article.

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