JP2003260082A - Deodoring and absorbing goods - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide deodoring and absorbing goods preferable for application of such products as a throwaway diaper, incontinence pad and physiological napkin showing a superior deodoring performance, preventing the deodoring agent from being fallen out, and further preventing a wearing person or a wearing instrument from being stained, by the deodoring agent. <P>SOLUTION: This absorbing goods 3 comprise a liquid permeating surface sheet 7, a liquid non-permeating anti-leakage sheet 5, and an absorbing core 6 placed between the surface sheet 7 and the anti-leakage sheet 5. An activated carbon fibrous sheet 8 containing activated carbon fibers by 1 to 80 wt.% is arranged between the surface sheet and the absorbing core 6. <P>COPYRIGHT: (C)2003,JPO

Description

Detailed Description of the Invention

[0001]

TECHNICAL FIELD The present invention relates to a disposable diaper,
The present invention relates to a deodorant / absorbent article suitable for product applications such as incontinence pads and sanitary napkins.

[0002]

2. Description of the Related Art Water absorbent resins used in absorbent articles are
Utilizing its absorption ability, water retention ability and gelling ability, absorbent products such as paper diapers, incontinence pads, sanitary napkins, breast pads, drip absorbents, freshness-retaining agents, pet sheets, excrement disposal agents It is used in various applications such as waste blood gelling agents. However, the water absorbent resin is
Although it has excellent ability to absorb and retain water such as blood, body fluid, and menstrual blood, it has almost no deodorant function. Therefore, the water-absorbent resin that has absorbed a liquid such as urine, blood, and body fluid has a peculiar unpleasant odor, and the substance to be absorbed such as urine is easily decomposed by air and / or bacteria,
Since a bad odor is emitted due to putrefaction, it has been demanded from a hygienic point of view that a material satisfying both the absorption effect and the deodorization effect is emerged.

As a method of satisfying both of these, a mixture of powders of a water absorbent resin and zeolite (Japanese Patent Laid-Open No. 57-258).
No. 13, JP-A-59-179114, JP-A-59-189854
No.), a composition in which activated carbon is coated with a water absorbent resin (JP-A-56-31425), and a composition comprising a water absorbent resin and an antibacterial agent (Japanese Patent Publication No. 3-14867). Application to a water-absorbent material obtained by mixing zeolite slurry in a polymerization solution and polymerizing, then spraying this solution onto a non-woven fabric and drying (JP-A-2-84957), zeolite powder in a water-absorbent resin A particulate water-absorbing material in which is dispersed (Japanese Patent Laid-Open No. 8-176338) has been proposed. However, when these compositions are applied to absorbent products, since urine, blood, body fluids, menstrual blood, etc. are covered with zeolite and activated carbon, a satisfactory deodorizing effect is not always obtained.

Further, a powdery deodorant (Japanese Patent Laid-Open No. 10-263063)
No. JP-A-10-211233), powdered Bincho charcoal,
A deodorant paper diaper in which a sheet containing bamboo charcoal (Japanese Patent Laid-Open No. 2000-300590) is arranged between an absorbent core and a leak-proof sheet is disclosed. However, such a deodorant paper diaper has a problem that the deodorant performance of the entire paper diaper is insufficient because the deodorant performance of the deodorant is insufficient. Also,
There is also a problem that the powdery deodorant drops off and stains the product, the skin of the wearer, and the clothing.

[0005]

DISCLOSURE OF THE INVENTION The present invention solves the above problems and is suitable for use in products such as disposable diapers, incontinence pads, sanitary napkins, etc., which are excellent in absorption and deodorant properties It is a technical subject to provide an article.

[0006]

The present inventors have arrived at the present invention as a result of extensive studies to solve the above problems. That is, the present invention provides a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and an absorbent article comprising an absorbent core interposed between the surface sheet and the leak-proof sheet, wherein the surface is A deodorant / absorbent article is characterized in that an activated carbon fiber sheet containing 1 to 80% by mass of activated carbon fiber is arranged between a sheet and an absorbent core.

[0007]

BEST MODE FOR CARRYING OUT THE INVENTION The deodorant / absorbent article of the present invention will be described below based on a preferred embodiment thereof. Figure 1
4 to 4 show examples in which the deodorant / absorbent article of the present invention is applied to a disposable diaper. The disposable diaper is worn together with a garment such as underwear and a diaper cover. As shown in FIGS. 1-2, the disposable diaper is integrated with the belt portion 1 surrounding the waist of the human body and the lower portion thereof, and the waist back to the body side portion. The leg belt portion 2 for covering the root portion of the thigh in the above, and the belt portions 1 and 2 are integrally arranged in the center of the belt portions 1 and 2 so as to intersect with each other at about 90 °, and are fixed to the abdomen by rotating the crotch from the buttocks. A deodorant / absorptive article 3 is formed, and a lateral leakage prevention gather 4 is formed around the lower edge of the leg belt portion 2 and around the deodorant / absorptive article 3.

The belt portions 1 and 2 are made of a combination of a breathable material and an elastic material of polyurethane / natural rubber, and are fitted to the abdomen appropriately to prevent displacement due to movement.
Moreover, the joining ends of the belt portions 1 and 2 and the joining end of the deodorant / absorbent article 3 to the belt portion 1 can be fixed by an adhesive agent not shown.

The deodorant / absorbent article 3 of the present invention is shown in FIGS.
As shown in FIG. 2, a water-absorbent core 6 made of a water-absorbent polymer laminated inside the flexible liquid-impermeable leak-proof sheet 5 in order from the outside, and laminated inside the water-absorbent core 6 for human contact. A surface sheet 7 made of a liquid permeable sheet that serves as a surface, and the periphery of the surface sheet 7 and the periphery of the liquid impermeable leak preventive sheet 5 are adhered to each other to hold the water absorbent core 6 inside. There is. In addition to the above configuration, an activated carbon fiber sheet 8 is sandwiched between the inside of the liquid-impermeable leak-proof sheet 5 and the water absorbent core 6.

The thickness of the activated carbon fiber sheet 8 can be appropriately determined, but is preferably 0.1 to 2.0 mm, more preferably 0.2 to 0.5 mm. The basis weight is
30 to 80 g / m ² is preferable, and 40 to 60 g / m ² is more preferable.

The activated carbon fiber sheet is formed mainly of activated carbon fibers and a fiber raw material. As the fiber raw material, known natural fibers such as straw, cotton and non-wood pulp such as cotton can be used. For the purpose of improving the sheet strength, heat-fusible fibers such as polyethylene fibers, polyester fibers, and core-sheath type polyester fibers used as binder fibers may be used alone or in combination. The content of the activated carbon fibers in the activated carbon fiber-containing sheet needs to be 1 to 80% by mass, preferably 2 to 60% by mass, and more preferably 3 to 40% by mass.
If the content of activated carbon fibers is less than 1% by mass, the deodorizing effect is insufficient, and if it exceeds 80% by mass, the sheet becomes hard.

As the activated carbon fiber, those made of cellulose type, pitch type, polyacrylonitrile, phenol resin, etc. can be used, but pitch type activated carbon fiber marketed as Adol by Unitika Co. is preferable. The specific surface area of activated carbon fiber is 500-2000m.
It is preferably ² / g, especially 700 to 1500 m ² / g. Further, depending on the generated odor component, activated carbon fibers for removing acidic gas (for example, S type manufactured by Unitika), activated carbon fibers for removing alkaline gas (for example N type manufactured by Unitika), etc. may be used together.

The activated carbon fiber sheet used in the present invention is
For example, it can be obtained by a dry papermaking method in which activated carbon fiber and a fiber raw material are supplied to a card machine such as a random card or a parallel card to form a web. At this time, a method of cross-wrapping the non-woven web with a cross wrapper according to the basis weight and mechanically causing three-dimensional entanglement of the fibers with a needle punch device to form an integrated non-woven web may also be applied. You can In some cases, the non-woven web thus formed is fused at a temperature equal to or higher than the melting point (or softening point) of the heat-fusible fiber and formed into a sheet to obtain a target activated carbon fiber sheet.

The absorbent core 6 is a portion for holding the absorbed body fluid, and various known materials conventionally used in absorbent articles can be used as a forming material thereof. It is preferably composed of a water-absorbing polymer. As the fibers constituting the fiber assembly, for example, natural cellulose such as wood pulp and cotton, regenerated cellulose-based fibers such as rayon and cupra are preferable, but thermoplastic fiber filaments and staple fibers can also be used. The fiber assembly may be a non-woven fabric.

As the water-absorbent polymer, various conventionally known ones can be used, but those capable of absorbing and retaining a liquid of 20 times or more its own weight and being capable of gelation are preferable. Preferred examples of the water-absorbent polymer, starch and cross-linked carboxymethyl cellulose, polymers or copolymers of acrylic acid or alkali metal acrylate, etc.,
Mention may be made of polyacrylic acid and its salts and polyacrylic acid salt graft polymers.

As the surface sheet and the leak preventive sheet in the deodorant / absorptive article, various known ones conventionally used in absorbent articles such as disposable diapers, incontinence pads and sanitary napkins are used. Can be used. As the leakproof sheet, for example, a polyethylene sheet,
A polypropylene sheet or the like can be used. Further, a material having moisture permeability is also used from the viewpoint of preventing stuffiness. The leakproof / moisture permeable sheet is, for example, a microporous sheet obtained by melt kneading an inorganic filler in an olefin resin such as polyethylene or polypropylene to form a sheet, and then stretching the sheet in a uniaxial or biaxial direction. There is. Further, as the liquid-permeable top sheet, a perforated or non-perforated nonwoven fabric, a perforated plastic sheet, or the like is used. As the material fibers constituting the nonwoven fabric, synthetic fibers such as olefins such as polyethylene and polypropylene, polyesters and amides, regenerated fibers such as rayon and cupra, and natural fibers such as cotton can be used.

When the above disposable diaper is worn and incontinent, urine passes through the surface sheet and is absorbed by the absorbent core, and the odor of urine and its rotten odor are adsorbed by the activated carbon fiber sheet. And its odor will not leak out from the leak preventive sheet. Furthermore, since the activated carbon fiber sheet, which is a fibrous deodorant, is used as the deodorant material, the deodorant is prevented from falling off when a powdery or granular deodorant is used, and the wearer's skin or clothing is prevented. Do not stain tools with deodorant.

The deodorant / absorptive article of the present invention is not limited to the above-mentioned disposable diaper, but can be applied to various product uses without departing from the spirit of the present invention. For example, other than incontinence pads, sanitary napkins, vaginal treatment sheets, etc., which are worn with the garment,
It can be suitably used for product applications such as pants-type disposable diapers, so-called unfoldable disposable diapers.

[0019]

EXAMPLES Next, the present invention will be described in detail with reference to examples, but the present invention is not limited to these. The deodorizing effect was measured by the following method. (1) Deodorant test of paper diapers Absorb 50 ml of adult fresh urine into paper diapers. Put this paper diaper in a 10-liter container, seal it, and store it in a thermostat set at 40 ° C for 15 hours. After that, the lid of the bottle is opened in an odorless room to smell the odor, and the odor intensity is evaluated in the following 6 stages. For the evaluation, 10 panelists whose odor determination ability has been confirmed by the T & T olfactometer method are evaluated on a scale of 6 from 0 to 5, and an average value is obtained. 0: Odorless 1: Smell that can be finally sensed (sensitivity value concentration) 2: Weak odor to understand what odor (cognitive value value concentration) 3: Easily sensible odor 4: Strong odor 5: Strong odor

Example 1 (Preparation of disposable diaper) A polyethylene sheet (thickness 0.1 mm) as a leak-proof sheet cut into a rectangle of 14 cm × 35 cm
In addition, activated carbon fiber sheet of size 10 cm x 30 cm [Basis weight 60
g / m ² , thickness 0.4 mm: activated carbon fiber (Unitika's A
-7) Content 10% by mass], tissue paper and basis weight 100
Stack g / m ² fluff pulp. Then, a commercially available water-absorbing polymer [“SANWET IM” manufactured by Sanyo Chemical Industry Co., Ltd.
-1000 "; cross-linked starch-sodium acrylate copolymer] 9.8 g was evenly spread on fluff pulp, and further fluff pulp having a basis weight of 50 g / m ² and 14 cm × 35 cm polyester as a liquid-permeable material. Nonwoven fabrics (Unitika, Elves, 50 / m ² ) are stacked in this order.
A model paper diaper was produced by pressing this laminate for 20 seconds at 100 ° C. and a pressure of 5 kg / cm ² .

Comparative Example 1 A model paper diaper was produced in the same manner as in Example 1 except that the activated carbon fiber sheet was not used.

Comparative Example 2 (Preparation of disposable diaper) A leak-proof, moisture-permeable polypropylene sheet cut into a rectangle of 14 cm × 35 cm was used, instead of the activated carbon fiber sheet of Example 1 of the same size, Bincho charcoal powder and polyacrylic tril were used as a binder. As a sheet adhered to polyester fiber (Bincho charcoal powder content 10% by mass, basis weight 60 g /
A model paper diaper 2 was produced in the same manner as in Example 1 except that m ² and thickness 0.4 mm) were used. Note that the Binchotan charcoal powder was dropped off during the production of the disposable diaper. Also, it was found to have fallen off during the deodorant test. Example 1 and Comparative Examples 1 to 1
Table 1 shows the evaluation results of the deodorizing performance of the paper diaper obtained in No. 2.

[0023]

[Table 1]

As is clear from Table 1, the paper diaper obtained in Example 1 had good deodorant performance and did not drop off activated carbon. On the other hand, the paper diaper of Comparative Example 1 having no activated carbon fiber sheet does not have deodorant performance, and the paper diaper of Comparative Example 1 using Binchotan charcoal powder instead of the activated carbon fiber sheet has low deodorant performance and the removal of activated carbon is also observed. Was given.

[0025]

EFFECTS OF THE INVENTION According to the present invention, a disposable diaper, an incontinence pad, which is excellent in deodorant performance, prevents the deodorant from falling off, and does not stain the wearer's skin or wearing clothing with the deodorant, Provided is a deodorant / absorbent article suitable for product use such as sanitary napkins.

[Brief description of drawings]

FIG. 1 is a front view showing an embodiment in which the deodorant / absorbent article of the present invention is used in a disposable diaper.

FIG. 2 is an explanatory view showing a worn state of the disposable diaper of FIG.

3 is a cross-sectional view taken along the line AA of FIG.

FIG. 4 is a sectional view taken along line BB of FIG.

[Explanation of symbols]

1 Belt section 2 leg belt 3 Deodorant / absorbent articles 4 Side leakage prevention gather 5 Leak prevention sheet 6 water absorbent core 7 Top sheet 8 Activated carbon fiber sheet

Claims (2)

[Claims] 1. An absorbent article comprising a liquid-permeable surface sheet, a liquid-impermeable leak-proof sheet, and an absorbent core interposed between the surface sheet and the leak-proof sheet. 1 to 1 of activated carbon fiber between the absorbent core and
A deodorant / absorbent article characterized by arranging an activated carbon fiber sheet containing 80% by mass. 2. A product using the deodorant / absorbent article according to claim 1.