JPH04185787A - Woven fabric for producing anti-staining paper - Google Patents

Abstract

PURPOSE:To provide the subject woven fabric having a large anti-staining property against gum pitches, etc., holding the anti-staining property even after washed, and suitable for reproducing paper from waste paper by weaving filaments having a water-absorbing degree of >= a specific value. CONSTITUTION:The objective woven fabric is prepared by weaving filaments having a water-absorbing degree of >=12% (preferably a nylon copolymerized with nylon 6, nylon 66, nylon 610 or nylon 6T, regenerated cellulose or PVA) preferably contained at least in wefts forming the paper-making surface of the woven fabric in an amount of >=30%.

Description

DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a stain-resistant papermaking fabric that is particularly suitable for papermaking that uses waste paper.

[Prior Art] In recent years, due to the need to conserve resources, the dual use of waste paper has been widely practiced in the paper manufacturing field.

However, when waste paper is used for both purposes, adhesive resin particles called gum pitch, which is a resin-based resin, adhere to the synthetic resin paper-making fabric and eventually become unusable. This stain is less on metal mesh, but more noticeable on synthetic resin papermaking fabrics.

Various methods have been devised to prevent this staining. One method is to mix fluorocarbon resin powder into a thermosetting resin and apply it to the threads to form a fluorocarbon resin coating on the surface of the constituent threads of the fabric. Although this method attempts to take advantage of the non-adhesive properties of fluorocarbon resin, it is not very effective because the fluorocarbon resin powder is buried in the thermosetting resin and difficult to come out to the surface. Another method is described in Japanese Patent Publication No. 46-22197, in which a hydrophilic coating is provided on the surface of the constituent yarns of the fabric. This method loses its effectiveness in a short period of time.

Still another method is the method described in Japanese Patent Publication No. 57-56474, in which a sulfonated or sulfated formalin resin coating is formed on the surface of a 1 m component yarn, and this method is the most effective to date. Although this method is highly effective, its initial antifouling effect is rather low, and its alkali resistance is low, so it tends to fall off during alkaline cleaning.

[Problems solved by the invention] To provide a long-term antifouling effect and to increase the initial antifouling effect in a papermaking fabric that is used while being rotated at a high speed of 1000 m/min and being sprayed with a slurry containing filler. It must also be able to withstand cleaning such as alkaline cleaning.

As a result of research, the present inventor solved this serious problem and completed the present invention.

[Means for Solving the Problems] The present invention provides: 1. A stain-resistant papermaking fabric woven with filaments having a water absorption rate of 12% or more.

2. Woven with at least 30% of filaments having a water absorption rate of 12% or more arranged in the weft yarns forming the paper-making surface;
The stain-resistant papermaking fabric according to claim 1.

3. The filament with a water absorption rate of 12% or more is selected from copolymerized nylon, regenerated cellulose, and polyvinyl alcohol. The stain-resistant papermaking fabric according to claim 1 or 2, wherein t is 2 or more.

4. Copolymerized nylon is nylon 6, nylon 66
The stain-resistant papermaking fabric according to any one of claims 1 to 3, which is a nylon copolymerized with two or more selected from , nylon 610, and nylon 6T. ” regarding.

The filament used in the present invention is a synthetic resin filament with a water absorption rate of 12% or more, and nine examples of which it is desirable to have a dry strength ratio of 60% or more include filaments made of formalized polyvinyl alcohol and copolymerized nylon filaments. , regenerated cellulose, etc. are suitable. Especially nylon
6, Nylon 66, Nylon 610, Nylon 6
A copolymerized nylon obtained by copolymerizing two or more selected from T, also has good palm abrasion resistance. As the filament, monofilament, bundled fiber, etc. are used.

These filaments having a water absorption rate of 12% or more must be used in at least 30% or more of the weft yarns on the papermaking surface. 30
% or less, the antifouling effect is low.

There is no restriction on the texture of the fabric, and it applies to single-fiber, double-layered, and triple-layered fabrics. It is particularly effective to form the paper-making surface with this high moisture content filament.

[Function] The present inventor has conducted extensive research into why gum pitch, which is present dispersed in a large amount of water in a slurry, adheres to papermaking fabrics. First, a comparative study was conducted using the same slurry and a metal mesh. It was found that gum pitch has the property of being difficult to adhere to metal mesh.

Further research progressed and when various objects were brought into contact with the slurry to examine the differences in adhesion, it was found that the amount of adhesion was smaller on hydrophilic surfaces.1 The inventors believe that this phenomenon occurred because the gum pitch is hydrophobic. I think of it as something. It has also been found that by treating the surface of the fabric as in the past, it is impossible to maintain the effect for a long period of time on papermaking fabrics that are used under severe conditions.

The present inventor went one step further and examined the adhesion of gum pitch to a wet surface and found that the amount of adhesion was extremely small.

Conventionally used papermaking fabrics woven with synthetic resin filaments are hydrophobic, which is the cause of stains.

Since it became clear that a sufficient effect could not be expected from surface treatment, the present inventors completely changed their thinking and considered incorporating a large amount of water into the filament itself. In other words, there is a correlation between the water content of the filament itself and the hydrophilicity of the surface, and for filaments that contain a large amount of water,
It was found that the surface showed strong hydrophilicity and gum pitch was difficult to adhere to.

Furthermore, unlike surface treatment, it was found that the effect was maintained for a long period of time without deterioration in performance due to cleaning etc. due to the performance of the filament itself.

Conventionally, it was thought that such water-absorbing filaments could not be used in papermaking fabrics, and it was unknown how much water should be included to be effective, so we first researched the range.

Specifically, as will be explained in the Examples section, adhesion of gum pitch cannot be prevented unless the moisture content of the filament is 12% or more.Dry and wet strength is required to maintain posture stability when using zero-order textiles. It is desirable that the ratio is 60% or more.

The present invention was completed by elucidating this effective moisture content and wet/dry strength ratio.

Next, the present invention will be specifically explained by giving Examples and Comparative Examples.

[Example 1] Polyester monofilament with a wire diameter of 0.25 mm was used for the warp, and nylon 6 (with a wire diameter of 0.30 mm) was used for the weft.
95%)-nylon 66 (5%) copolymer monofilament, the warp density is 56/hand' and the weft density is 45.
A book/fu' plain weave fabric was woven.

[Example 2] Polyester monofilament with a wire diameter of 0.25 cm was used for the warp, and 420 denier polyvinyl multifilament (apparent wire diameter 0.23a) was used for the weft, with a warp density of 56/ch' weft density of 45. /fu'nohira! Woven tissue fabric.

[Comparative Example 1] Except for using nylon 6 monofilament for the weft,
A woven fabric was woven in the same manner as in Examples 1 and 2.

[Comparative Example 2] A woven fabric was woven in the same manner as in Example 1.2 except that polyester monofilament was used for the weft.

[Comparative Example 3] The fabric of Comparative Example 2 was treated with 20% Na at 70°C after methanol degreasing.
This is a fabric whose surface has been made hydrophilic in an OH solution.

[Comparative Example 4] Example 1 except that 450 denier polyester multifilament (apparent wire diameter 0.31 m>) was used for the weft.
A fabric was woven in the same manner as in , 2.

Comparative Test〉 O Comparative Test 1 The test was conducted using fabrics of each example and comparative example with a length of 3.8 m and a width of 30 m.
100m/min when set on a cm test fourdrinier paper machine
The test slurry was used for continuous paper making for 12 hours. After papermaking was completed, the paper was dried and its weight was measured.

The difference between the weight before use and the weight after use of the R product was compared. The weight increase in the comparative example was expressed as a ratio to the weight increase in Example 1 of the present invention.

The test results are shown in Table 1.

Table 1 Note 1: In order to obtain results quickly, the test slurry was prepared by adding and dispersing 5% adhesive for gummed tape to the papermaking slurry in which waste corrugated paper was dispersed in water.

Evaluation> As is clear from the test results, it is clear that the conventional woven fabric has 7 to 21 times more stains than the woven fabric of the present invention. From the fact that the weft water absorption rate and the amount of dirt deposited are inversely proportional, it is understood that filaments with a water absorption rate of 12% or more must be used.

O Comparative Test 2 Using the same fabric as in Comparative Test 1, a comparison was made to see if the stain prevention effect was not reduced by shower washing. The test was conducted using a duct tape peel test.

The results of the comparative test are shown in Table 2.

Table 2 Note 1: In the duct tape peel test, duct tape (Cloth Adhesive Tape N (1141) manufactured by Teraoka Seisakusho Co., Ltd.) was placed on a fabric sufficiently soaked with water, and the weight of 2
kg, diameter 83, medium 45B roll approximately 300m/m
It was made to reciprocate once at a speed of
A 180° peel test was conducted at a speed of 0 m/min.

Note 2: Cleaning was carried out using a Nippon Filcon running test machine at 400°C.
m/min''C: Running the fabric and washing with a 45° fan type shower at a pressure of 20 kg/a IIi amount of 15 J/m
1nilf product - Conducted for 7 days under the condition of nozzle spacing of 100m+.

Evaluation> It is clear from the comparative example that the conventional ITL shows high stain resistance both before and after washing. Although Comparative Example 3 has a stain prevention effect before washing, it is clear that the effect is lost after showering. This shows that the surface treatment as in Comparative Example 3 is less effective since papermaking is performed while showering.

[Effects] As described above, the present invention dramatically increases the stain resistance of gum pitch, etc. by arranging filaments with special performance in the threads that make up the fabric, and the effect does not change even after washing. This is a particularly successful invention, and in the field of paper manufacturing, where waste paper is recycled, it has a very long service life and has excellent effects in improving paper manufacturing efficiency.

Claims (1)

[Claims] 1. A stain-resistant papermaking fabric woven with filaments having a water absorption rate of 12% or more. 2. The stain-resistant papermaking fabric according to claim 1, which is woven with at least 30% of filaments having a water absorption rate of 12% or more arranged in the weft yarns forming the papermaking surface. 3. The stain-resistant papermaking fabric according to claim 1 or 2, wherein the filament having a water absorption rate of 12% or more is one or more selected from copolymerized nylon, regenerated cellulose, and polyvinyl alcohol. 4. Copolymerized nylon is nylon 6, nylon 66,
Claims 1 to 3 are nylons copolymerized with two or more selected from nylon 610 and nylon 6T.
The stain-resistant papermaking fabric described in any one of the above.