JPS6211528A - Deodorizing sheet - Google Patents

Abstract

PURPOSE:To obtain a deodorizing sheet wherein the amount of a deodorant to be deposited is plenty and the bonding strength is large by interposing respectively a powdery granular deodorant, a thermal adhesive resin and a water absorbent polymer between two sheets of cotton mixing contg. thermpolastic fiber, heat-compressing the mixture and subjecting it to the embossing finish. CONSTITUTION:A powdery granular mixture 2 of a deodorant such as activated carbon, a thermal adhesive resin such as polyester and a water absorbent polymer such as a starch-acrylic acid graftcopolymer is scattered on cotton mixing 1 which consists of 80-40% cellulose fiber and 20-60% thermoplastic fiber such as polyester and is spun as it is and furthermore one sheet of cotton mixing 3 is superposed thereon and the whole is heat-compressed and subjected to the embossing finish to prepare a deodorant sheet. The surfaces of the thermplastic fiber incorporated in the cotton mixing and the powdery granular thermal adhesive fiber are fused and bonded and thereby the whole bonding is strengthened.

Description

DETAILED DESCRIPTION OF THE INVENTION <Field of Industrial Application> The present invention relates to a deodorizing sheet. More specifically, the present invention relates to a deodorizing sheet formed by fixing a powdery deodorizing agent between two sheets of freshly spun cotton.

<Conventional technology> Two sheets of as-spun cotton, such as absorbent cotton, are used, a deodorizing agent such as activated carbon or a water-absorbing polymer is interposed between the two sheets, and the whole is compressed and embossed. Methods for producing sheet-like molded products are known from JP-A-59-199242 and JP-A-59-204955.

Although this publication does not describe the use of a mixture of a deodorizer and a water-absorbing polymer, the present inventors have found that the use of a mixture of a deodorizing agent and a water-absorbing polymer is compared to using only activated carbon between two pieces of cotton. Therefore, interposing a mixture of activated carbon and a water-absorbing polymer has the effect that more activated carbon can be supported and the adhesive strength between the two pieces of cotton is greater. For example, when a blend of cellulose fiber and 40% low melting point polyester is used, and activated carbon is interposed between the blended cotton, the
The limit is to support activated carbon of g/rnl. On the other hand, when a mixture of 100 parts by weight of activated carbon and 30 parts by weight of water-absorbing polymer is used, the total amount is 65 to 9 oy.
/m”.

It becomes possible to support 50 to 70 fi/d in terms of the amount of activated carbon. In addition, activated carbon was added at 100 lit/f.
f? When the wires are interposed, the adhesive strength between the wires is 6.
01i+/45mm width, activated carbon Zoo
g, water-absorbing polymer 1019, and interposing this mixture so that the total amount is 1101i+/m" (100 fi/1 activated carbon is 10 g/m" of water-absorbing polymer), the adhesive strength between the wires is 80 g. /4F 1m width.

In this way, the inventions described in JP-A-59-199242 and JP-A-59-204955 are excellent;
Moreover, when using a mixture of deodorizer and water-absorbing polymer,
Although it produces excellent effects that are not described in this publication, the amount of deodorizing agent, for example, the above-mentioned 50 to 70 Fi/d, is insufficient for a deodorizing sheet;
The adhesive strength of a width of 74511 m is extremely insufficient, as it will peel off if rubbed, and for practical purposes, an adhesive strength of approximately Zoo fi/45 ttt* width is required.

<Object of the Invention> The present invention has been made in view of the above circumstances, and it is possible to interpose a powdery deodorizing agent between two pieces of cotton and compress and emboss the whole to make a sheet-like molded product. It is an object of the present invention to provide a deodorizing sheet that supports a large amount of deodorizing agent and has high adhesive strength.

<Configuration of the Invention> In order to achieve this object, the present invention utilizes two thermoplastic fibers.
A mixture consisting of a powdery deodorizer, a powdery thermoadhesive resin, and a powdery water-absorbing polymer is interposed between two sheets of as-spun blended cotton containing 0 to 60%, and the whole We provide deodorizing sheets made by heat compression embossing.

<Detailed description of the invention> The present invention will be described below with reference to the drawings.

The first drawing is an explanatory cross-sectional view of the deodorizing sheet of the present invention.
(1) and (3) are compression embossed blended cotton, (2)
) indicates a powder mixture of deodorizer, thermoadhesive resin, and water-absorbing polymer.

The blended cotton is “as spun” before being compressed and embossed.
However, "as spun" is used here to mean fluffy like cotton wool, and has not been chemically modified or water jet processed. Also good.

The blended material is a mixture of 80 to 40% cellulose fibers and 20 to 60% thermoplastic fibers, and as the thermoplastic fibers, fibers such as polyester, polypropylene, and polyethylene can be used.

In addition, activated carbon, cyclodextrin,
Alternatively, a powdered or granular deodorizing agent such as a mixture of ascorbate and ferrous sulfate heptahydrate can be used.

As the thermoadhesive resin, polyethylene, polypropylene, ethylene-vinyl acetate copolymer, etc. can be used.

The water-absorbing polymer may be any known one, such as starch-acrylic acid graft polymer, acrylic acid-vinyl alcohol copolymer, sodium polyacrylate, etc., which are commercially available.

The mixing ratio of these particulate materials is 10 to 50 parts of the thermal adhesive resin per ioo part by weight of the deodorizer, with the deodorizer as the main material.
parts by weight and 0.5 to 30 parts by weight of the water-absorbing polymer.

FIG. 2 of the drawings is an explanatory diagram showing a method for manufacturing a deodorizing sheet using these materials, and (4) and (6) show winding of the mixed cotton. After the mixed cotton is continuously unwound from this winding (4), a powdery mixture is sprinkled thereon. (5) shows this dispersion part.

After this, the blended cotton layer unwound from the winder (6), the heating embossing roll (7) and the backup row /L/(
The whole is compressed between 81 and a part thereof (the part located on the convex part of the embossing roll) is further compressed and embossed. For example, if the thickness of blended cotton (4) and (6) is 3 to 7 fins, the thickness when stacked with blended cotton (6) will reach 6 to 15 fins, but this thickness will be reduced by compression embossing. 0.5~
It becomes 11111. The embossed part is even thinner than this, with a thickness of 0.3 to Q, 9111.

Note that (7) is an embossing roll heated to 120 to 150°C, and the heat melts at least the surface of the thermoplastic fibers and powdery thermoadhesive resin in the cotton blend, thereby strengthening the overall adhesion. This adhesion is performed mainly on the embossed portions, and the non-embossed portions are bonded with a relatively weak adhesive force. Also, the part that wasn't embossed is also heated and compressed, so even if you cut it here, the deodorizer won't spill out.

After being heat-compressed embossed, this sheet is rolled up (9)
is wound up.

The obtained deodorizing sheet is as shown in Figure 1.
For convenience of explanation, the intertwining of fibers is omitted in Figure 1, but in reality, the fibers of blended cotton (1) and blended cotton (3) are intertwined, and the thermoplastic fibers and powdery thermoadhesive resin are intertwined. The surfaces are bonded together by melting, making the whole piece a single piece.

The present invention will be explained below with reference to Examples.

<Example 1> As a mixed cotton, a mixed cotton (65 g/m" thickness of about 3 mm) consisting of 60% by weight of cellulose fiber and 40% by weight of low melting point polyester was used.

Powdered activated carbon was used as the powdery deodorizing agent, powdered polyethylene was used as the powdery heat-adhesive resin, and a commercially available water-absorbing polymer was used.

The mixing ratio is 20 parts by weight of polyethylene and 5 parts by weight of water-absorbing polymer to 100 parts by weight of activated carbon.

In order to produce a deodorizing sheet using these materials and the apparatus shown in Figure 2, and to make it a sheet that does not pose any practical problems,
We measured how many grams of activated carbon it could hold. In addition, the compression ratio is approximately 1.5 mm, and the thickness of the obtained deodorizing sheet is approximately 111 mm.
．． The embossing depth was about 0.4 ff, and the embossing roll was heated to 120 to 140°C. In addition, at this time, even if the cut was made at an arbitrary position, the activated carbon did not spill out.

This result is equivalent to the amount of activated carbon of 160 to 200 g/
- is the limit, and the total amount of activated carbon, thermoadhesive resin, and water-absorbing polymer was 200 to 2501 it/i.

If the amount of the mixture to be sprayed was increased beyond this level, practical adhesive strength could not be obtained.

For comparison, when only activated carbon is used, the mark is activated carbon 100
The case (b) was measured using a mixture in which 30 parts by weight of the water-absorbing polymer was mixed with respect to parts by weight. In the case of (a), activated carbon is 30 to 50 g/m", in the case of (b), activated carbon is 50 to 7 g/m"
The limit was 0p (total amount: 65 to 90 g/d), and in any case, if the amount of spraying was increased beyond this, practical strength could not be obtained.

<Example 2> The same materials as in Example 1 were used for the cotton blend, deodorizing agent, thermoadhesive resin, and water-absorbing polymer.

30 parts by weight of thermal adhesive resin for 100 parts by weight of activated carbon,
10 parts by weight of a water-absorbing polymer was mixed, and 10 gyrn of activated carbon (total amount 14
A deodorizing sheet is prepared so that oy, ym') are present,
When we measured the adhesive strength between cotton blends, it was 2409/4.
It was 5 nn wide. Also, any position (for example, a convex part)
Even when the deodorizing sheet was cut, the activated carbon did not spill out.

For comparison, when only activated carbon is used (A), activated carbon 1
The adhesive strength was measured in the case (b) using a mixture of 0.00 parts by weight and 10 parts by weight of a water-absorbing polymer.

In addition, in both cases (a) and (b), activated carbon is 100%
g/-. As a result, the adhesive strength of (a) is 60 g/45mm width, and the adhesive strength of (b) is 80 g/45mm width.
f/45 width.

<Effects of the Invention> As described above, the present invention has the effect that the amount of deodorizing agent that can be supported between the cotton blends is extremely large, and the adhesive strength is also high. Also, no matter where you cut the sheet, the deodorizer will not spill out.

[Brief explanation of the drawing]

The drawings all show embodiments of the present invention; FIG. 1 is an explanatory sectional view of a deodorizing sheet, and FIG. 2 is an explanatory diagram of a deodorizing sheet manufacturing apparatus.

Claims (1)

[Claims] 1) Between two pieces of as-spun blended cotton containing 20 to 60% thermoplastic fibers, there are three components: a powdery deodorizer, a powdery thermoadhesive resin, and a powdery water-absorbing polymer. A deodorizing sheet made by interposing a mixture and applying heat compression embossing to the entire surface.