JP2002113044A - Absorptive article - Google Patents

Abstract

PROBLEM TO BE SOLVED: To prevent distortion in wearing an absorptive article to underwear while capable of peeling adhesive parts, even when they are accidentally bonded to each other without causing the elongation or tear of a base fabric. SOLUTION: In a sanitary napkin 1, an absorber 4 is interposed between a liquid permeable top sheet 3 and a liquid impermeable back sheet 2, and the non-service face side is formed with adhesive layers 5, 6 whose initial adhesive strength to cotton cloth is 1.0 N/25 mm or more while the adhesive strength when bonded to each other between the adhesives is 1.5 N/25 mm or less.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to absorbent articles such as sanitary napkins, panty liners, vaginal sheets, incontinence pads, etc. for absorbing menstrual blood, vaginal discharge, and the like.

[0002]

2. Description of the Related Art Conventionally, as an absorbent article such as a panty liner, a sanitary napkin, a vaginal sheet, an incontinence pad, etc., for example, a liquid-impermeable bag made of a polyethylene sheet or a polyethylene laminated non-woven fabric as shown in FIG. It is known that an absorbent body 4 made of cotton-like pulp or the like is interposed between a sheet 2 and a liquid permeable top sheet 3 made of a nonwoven fabric or a porous plastic sheet.

[0003] In this type of absorbent article, an adhesive layer for adhering the absorbent article to underwear is formed on the non-use surface side in order to prevent displacement. For example, in the sanitary napkin 1, as shown in FIG. 2, two adhesive layers 5 and 5 are formed on the non-use surface side along the product longitudinal direction, and external The wings W, W extending in the direction are provided integrally, and the adhesive layers 6, 6 are formed on the wings W, W. In the product state, each of these adhesive layers 5.
Are temporarily attached to the release paper 7 in a peelable state.

When fixing the sanitary napkin to the undergarment, first, the release paper 7 temporarily attached to the non-use surface side is peeled off, and the release papers 8 temporarily attached to both wings W, W are removed. As shown in FIG. 3, as shown in FIG. 3, a sanitary napkin is applied to the inner surface of the crotch portion of the underwear 20, and the wings W, W projecting sideways are wound around the side edges of the crotch portion of the underwear 20, and the crotch portion of the underwear 20 is removed. Adhere to the outer surface of each part.

[0005]

However, the parts to which the adhesive has been applied are adhered to each other when attached to underwear, and when the parts are peeled off, the base material is stretched or torn, so that it can be used. There was a problem that it might disappear. In particular, the tendency is remarkable in a portion such as the wing W which is structurally easily bonded to other portions.

In order to prevent such a situation from occurring, an adhesive is not applied to a portion facing the wing W on the non-use surface side, or a release treatment or the like is applied to the portion facing the wing W on the non-use surface side. Countermeasures have been taken such as to prevent application and adhesion. However, even in this case, although the possibility that the adhesive applied portion is erroneously adhered is reduced,
If they are adhered to each other, they will not be able to be mounted again, which is not enough.

Therefore, a main problem of the present invention is that, even when the adhesive-applied parts are erroneously adhered to each other when attached to underwear, the base material can be peeled without elongation or tearing. Another object of the present invention is to provide an absorbent article formed with an adhesive layer capable of exhibiting a functionally sufficient effect of preventing slippage of the underwear when worn.

[0008]

According to the present invention, there is provided an absorbent article having an absorbent body interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet. An adhesive layer having an initial adhesive force of 1.0 N / 25 mm or more on a cotton cloth and having an adhesive force of 1.5 N / 25 mm or less when bonded between the adhesives was formed on the use surface side. It is characterized by the following.

[0009]

Embodiments of the present invention will be described below in detail with reference to the drawings. FIG. 1 is a development view of a sanitary napkin according to the present invention, and FIG. 2 is a rear view thereof.

The absorbent articles targeted by the present invention are panty liners, sanitary napkins, vaginal sheets, incontinence pads, etc. Specifically, the liquid-impermeable backsheet 2 and the liquid-permeable topsheet 3 In the illustrated example, the adhesive layer 5 is formed on the non-use surface side of the napkin main body, and both sides in the longitudinal direction middle of the napkin main body are provided. Adhesive layers 6, 6 are formed on the back side of the wings W extending outward. The present invention is applicable to any product having an adhesive layer formed on the non-use surface side of the product regardless of the presence or absence of the wing W.

As the liquid-impervious back sheet 2, a sheet material having at least water-blocking properties, such as a polyethylene sheet, is used. In addition, a laminated non-woven fabric obtained by laminating a non-woven fabric on a polyethylene sheet or the like, or a waterproof film is also used. A nonwoven fabric sheet that is substantially liquid-impervious by interposition (in this case, a liquid-impervious backsheet is constituted by a waterproof film and a nonwoven fabric) can be used, and the like.
It may be breathable or non-breathable.

Next, as the liquid-permeable top sheet 3,
A perforated or non-porous nonwoven fabric or a porous plastic sheet is preferably used. The material fibers constituting the nonwoven fabric can be synthetic fibers such as olefins such as polyethylene or polypropylene, polyesters, polyamides, etc., recycled fibers such as rayon and cupra, and natural fibers such as cotton. Method, spunbond method,
A nonwoven fabric obtained by an appropriate processing method such as a thermal bond method, a melt blown method, and a needle punch method can be used.

The absorber 4 interposed between the liquid-permeable top sheet 3 and the liquid-impermeable back sheet 2 is made of, for example, fluff-like pulp and a water-absorbing polymer. The absorbent polymer is mixed in the pulp constituting the water absorbent, for example, as a granular powder. Examples of the pulp include chemical fibers obtained from wood, cellulose fibers such as dissolved pulp, and artificial cellulose fibers such as rayon and acetate.Conifer pulp having a longer fiber length than hardwood pulp functions and It is preferably used in terms of price.

On the other hand, as an adhesive for forming the adhesive layers 5 and 6, an adhesive mainly containing any of a styrene-based polymer, a tackifier and a plasticizer is used. Examples of the styrene-based polymer include a styrene-ethylene-butylene-styrene block copolymer, a styrene-butadiene-styrene block copolymer, and a styrene-isobutylene-styrene copolymer, but only one of these is used. Alternatively, two or more polymer blends may be used. Among them, a styrene-ethylene-butylene-styrene block copolymer is preferable in that it has good thermal stability. As the tackifier and the plasticizer, those which are solid at room temperature can be preferably used. As the tackifier, for example, C5 petroleum resin, C5
Nine petroleum resins, dicyclopentadiene petroleum resins, rosin petroleum resins, polyterpene resins, terpene phenol resins, and the like. Examples of the plasticizer include monomer plasticizers such as triflesyl phosphate, dibutyl phthalate, and dioctyl phthalate. And a polymer plasticizer such as a vinyl polymer or polyester.

The adhesive is 1.0 N / 25 with respect to cotton cloth.
Those having an initial adhesive force of at least 1.5 mm and an adhesive force of 1.5 N / 25 mm or less when bonded between the adhesives are used. When the initial adhesive strength to the cotton cloth is less than 1.0 N / 25 mm, the adhesive cannot exert a sufficient slip-preventing function with respect to the underwear, and the adhesive strength between the adhesives is 1.5 N. If it is / 25 mm or more, the base material (liquid-impermeable back sheet 2) will be stretched or torn at the time of peeling, making it unusable.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS The past experiments by the present inventor have revealed that the required adhesive force for underwear capable of exhibiting a sufficient function of preventing slippage is 1.0 N / 25 mm or more. Therefore, in order to obtain the upper limit of the adhesive strength between the adhesives that can be peeled without stretching or tearing of the base material when the adhesives adhere to each other while having an adhesive strength of 1.0 N / 25 mm or more to the cotton cloth. An experiment was performed.

In the experiment, a specimen to which an adhesive was applied was prepared, and a peeling force test and a peeling force sensory evaluation were performed. The test sample was prepared by applying an elastomer hot melt adhesive (a coating weight of 30 g / m ² and a coating width of 25 mm) containing a styrene-ethylene-butylene-styrene block copolymer as a main component to the back surface of the liquid-impermeable back sheet. One used. The peeling force test was performed according to JIS-G4305. That is, the adhesive-coated surfaces of the specimens are overlapped and pressed with one reciprocation of a 1 kg roller, and a speed of 300 mm / min within 3 minutes after bonding.
, And the resistance was measured to determine the adhesive strength of the adhesive (hereinafter referred to as melt-melt adhesive strength).
The initial adhesive strength was measured in the same manner. In addition,
For the measurement, a tensilon type universal testing machine was used, and the average value of three times was defined as the adhesive strength.

In the sensory evaluation of the peeling force, a test piece was manually peeled off by a panelist, and the ease of peeling off the adhesive was evaluated. The evaluation criteria were evaluated in the following four stages (◎, △, Δ, ×). The peeling force sensory evaluation criteria are as follows: the specimen is peeled without resistance without stretching: ◎, the specimen is peeled without stretching, although there is some resistance: ○, the specimen is stretched when peeled, and there is resistance: △, peeled Specimen sometimes breaks: x.

[0019]

[Table 1]

As shown in Table 1, as a result of the test,
If the adhesive strength between the melts exceeds 1.5 N / 25 mm, there will be resistance during peeling, and the specimen will be stretched or broken and the shape will be damaged, making it difficult to use again.
Therefore, it was found that the melt-to-melt adhesive strength is desirably 1.5 N / 25 mm or less.

[0021]

As described in detail above, according to the present invention, even when the adhesive-applied parts are erroneously adhered to each other when attached to underwear, the base material is not stretched or torn. In addition to being able to be peeled off, it is possible to provide an adhesive layer capable of exhibiting a functionally sufficient effect of preventing slippage of the underwear when worn, so that all absorbent articles can be used without waste.

[Brief description of the drawings]

FIG. 1 is a development view of a sanitary napkin according to the present invention.

FIG. 2 is a rear view thereof.

FIG. 3 is a diagram showing the state of use.

[Explanation of symbols]

1 ... sanitary napkin, 2 ... liquid-impermeable backsheet, 3 ...
Liquid permeable top sheet, 4 ... absorber, 5/6 ... adhesive layer,
20 ... Underwear, W ... Wing

Continued on the front page F term (reference) 3B029 BD12 4C003 AA08 BA03 CA06 DA04 FA01 HA05 4C098 AA09 CC23 CC36 CE08 DD03 DD05 DD10 DD12 DD24 DD25 DD26 DD28

Claims (1)

[Claims] An absorbent is interposed between a liquid-permeable top sheet and a liquid-impermeable back sheet, and has an initial adhesive strength of 1.0 N / 25 mm or more on a cotton cloth on a non-use surface side. Has an adhesive force of 1.5 when bonded between the adhesives.
An absorbent article having an adhesive layer having a thickness of N / 25 mm or less.