JP2955946B2 - Wear-resistant endless papermaking fabric - Google Patents

Description

Description: FIELD OF THE INVENTION The present invention relates to an endless papermaking fabric having excellent abrasion resistance.

[Prior Art] There is a greater demand for papermaking fabrics than before. Broadly speaking, (a) problems of paper quality itself such as prevention of wire mark generation, sufficient entanglement of paper fibers, and problems of paper production yield, (b) improvement of abrasion resistance, and extension of the service life of woven fabric Problems, and (c) good aqueous problems. Although each issue is often related,
Roughly speaking, the problem (a) is mainly related to the structure of the papermaking surface of the fabric, (b) is deeply related to the structure of the running surface of the fabric, and (c) is a problem related to the fabric object. It is.

Such a problem is a problem common to all papermaking fabrics, and must be solved in a single-woven fabric and a multi-woven fabric as well.

Conventionally, many proposals have been made for the solution (a). However, the problem of (b), that is, the improvement of the wear resistance of the papermaking fabric has not been sufficiently devised, and the running side of the papermaking fabric is of a weft-wear type, and is limited to the extent of preventing warp abrasion. .

However, in recent years, various conditions such as an increase in the speed of papermaking, an increase in the amount of filler used, and an increase in the necessity of producing neutral paper have been required, and the abrasion resistance of papermaking fabrics has become an increasingly important problem. .

Further, as will be understood from the above problem (c), if the structure of the running surface changes, the water will also be affected, and the problem cannot be solved by palliative means such as thickening the weft at the end.

[Problems to be Solved by the Present Invention] In view of the above-mentioned problems of the conventional technology, the present inventors have noticed that the most important performance for papermaking fabrics is good abrasion resistance. Then, the improvement of wear resistance was studied as the biggest subject.

The present invention seeks to improve abrasion resistance without affecting the performance of papermaking such as water-based papermaking fabrics.

Means for Solving the Problems The present invention has solved the above-mentioned problems, and is directed to a monofilament having a heat shrinkage of 8% or more in boiling water for 20 minutes in a copolymerized nylon of nylon 6 and nylon 6.6. Abrasion-resistant endless papermaking fabric woven by placing on the weft.

2. The wear-resistant endless papermaking woven fabric according to claim 1, wherein the monofilament of nylon 6 in which the weft is disposed and the monofilament of nylon 6.6 are monofilaments having a water absorption of 12% or more.

3. Copolymerized nylon monofilament of nylon 6 and nylon 6.6 to be placed on the weft is a monofilament with a heat shrinkage of 8% or more for 20 minutes in boiling water and a heat shrinkage of 7% or more at 140 ° C for 10 minutes. 3. A wear-resistant endless papermaking fabric according to claim 1 or 2.

4. A wear-resistant endless papermaking woven fabric in which the monofilament of the copolymerized nylon according to any one of claims 1 to 3 is woven by arranging at least 25% of the weft forming a wear surface. About.

In the present invention, the monofilament for arranging the weft of the woven fabric is mainly composed of nylon 6 and 1 to 60% of nylon 6.6.
It is composed of copolymerized nylon.

25% of this monofilament in the weft forming the wear surface
It is desirable to arrange the above. Monofilaments such as ordinary polyesters and polyamides can be used in combination as long as the excellent abrasion resistance of the copolymerized nylon monofilament is not impaired.

Then, it is necessary to arrange a monofilament manufactured from the copolymerized nylon of the nylon 6 and the nylon 6.6 on the weft to obtain a weft-wear-type woven fabric. When the warp is worn and cut, the warp wear type fabric cuts the fabric itself and the service life is exhausted. However, even when the weft is worn, the fabric itself is not cut and the service life is long.

The papermaking fabric of the present invention includes a single-woven fabric, a so-called single-layer fabric, a multi-woven fabric, and a multi-layer fabric in which a plurality of fabrics are joined by binding yarns, and a copolymerized nylon monofilament is arranged on the weft on the running surface side. Is preferred.

[Operation] The inventor of the present invention has for the first time realized that the copolymerized nylon monofilament of nylon 6 and nylon 6.6 used in the present invention exhibits a special performance which is not exhibited in other uses when used in a papermaking fabric. Elucidated.

One of the features of papermaking fabrics is that they rotate at a high speed of 1000 m / min during use and come into contact with many components of the papermaking machine including the suction box and suffer wear. There is no other use for such fabrics.

The second characteristic is that there is a large number when used. Therefore, the performance of the papermaking fabric cannot be predicted from the performance in a state of low water.

The third characteristic is a problem of ear curl that rises when the endless end of the woven fabric, that is, when the endless woven fabric is rotated at a high speed. Since the above-described papermaking fabric rotates at a high speed of 1000 m / min, ear curls are more likely to occur, and when ear curls occur, running stability is lost and meandering occurs, causing early wear near the ears. .

In this way, papermaking fabric is a very special fabric,
From the performance of the filament itself, the effect when used in a yarn of papermaking fabric cannot be predicted at all, but is also difficult to predict from ordinary fabrics.

However, the largest of these requirements is still abrasion resistance. The inventor of the present invention has diligently studied to develop a woven fabric satisfying the above requirements and exhibiting excellent wear resistance, and has completed the present invention. The present inventor has conducted many experiments on the performance of filaments constituting a woven fabric in a woven fabric used in a very special use state of papermaking, and as a result of repeated studies, nylon 6 and nylon 6.6 were obtained.
When monofilaments of nylon copolymerized with are used in papermaking fabrics, they have obtained new knowledge that they exhibit special performance that is not exhibited when used in other applications. The research was repeated and the present invention was completed.

The reason why the nylon monofilament of nylon 6 and nylon 6.6 used in the present invention exhibits extremely excellent abrasion resistance which cannot be exhibited by other synthetic resin monofilaments when used in papermaking fabrics; Whether the abrasion resistance that is not exhibited in other forms of use is exhibited only when used for papermaking fabrics, or the scientific reason for this is not always sufficient, but in view of the effect of repeated reproduction, the present inventor has proposed this copolymer nylon. It is believed that there is one basis for the effect on the large water absorption of the monofilament. As described above, the papermaking fabric rotates at a high speed of 1000 m / min in the presence of a large amount of water, and comes into contact with many components of the papermaking machine including the suction box and suffers abrasion. At this time, if a large amount of water is contained in the monofilament constituting the woven fabric, it is considered that the water contained when the monofilament comes into contact with an element of the papermaking machine performs a lubricating action to prevent abrasion. Indeed, there is a lot of water when making paper, but supplying lubricant from outside,
It is considered that the internal lubrication in which the monofilament itself containing a lubricant has lubricating properties results in a difference in lubrication effect on the monofilament when rotating at a high speed of 1000 m / min and undergoing wear. The monofilament of the copolymerized nylon used in the present invention has a water absorption of 12% or more. This means that the water absorption of monofilament is about 9% for nylon 6, 8% for nylon 6.6, 3% for nylon 6.10, and about 2% for nylon 6.12. From about 9%, it is understood that the water absorption of the copolymer monofilament of nylon 6 and nylon 6.6 used in the present invention is large.

Further, the heat shrinkage is larger than that of other nylon monofilaments, and the heat shrinkage for 20 minutes in boiling water is 8% or more and the dry heat shrinkage is 7% or more at 140 ° C. for 10 minutes.

By arranging and weaving the monofilament having such special performance on the weft, it is possible to prevent ear curl often seen in a multi-woven fabric and increase abrasion resistance due to the above-mentioned properties. The papermaking fabric of the present invention has 2-3 times the abrasion resistance of the conventional papermaking fabric.

Monofilaments such as polyethylene terephthalate and polyamide are used for the warp.

Next, the present invention will be specifically described with reference to Examples and Comparative Examples.

[Example] Example 1 Polyethylene terephthalate monofilament having a wire diameter of 0.17 mm was used for the warp, and 6-nylon 95%, 6.6 for the weft
-Disintegrated twill woven fabric having a mesh number of 92 / inch, using a copolymerized nylon monofilament consisting of 5% by weight of nylon and a ratio of polyethylene terephthalate monofilament / copolymerized nylon monofilament of 1: 1 with a total number of warps of 60 / inch. Was woven.

Example 2 6-nylon as copolymerized nylon monofilament
A woven fabric was prepared in the same manner as in Example 1, except that a copolymerized nylon monofilament consisting of 60% by weight and 6.6-nylon by 40% by weight was used.

Comparative Example 1 A woven fabric was prepared in the same manner as in Example 1 except that 6-nylon monofilament was used as the nylon monofilament.

Comparative Example 2 A woven fabric was produced in the same manner as in Example 1 except that 6.6-nylon monofilament was used as the nylon monofilament.

Comparative Example 3 A woven fabric was prepared in the same manner as in Example 1, except that a 6 · 10-nylon monofilament was used as the nylon monofilament.

<Comparative test> Table 1 shows the results of the wear test.

<Evaluation> Comparing the dry abrasion cutting time of the single yarn, the comparative example is rather superior to the example of the present invention. However, it is understood that the weft abrasion cutting time of the woven fabric actually used for papermaking is more than three times better in each embodiment of the present invention. This effect is because the yarn absorbs an appropriate amount of water and exhibits lubricity internally.

[Effects] As described above, the present invention is an invention in which a filament having a special performance is arranged in the weft of a woven fabric, thereby achieving a remarkable increase in abrasion resistance. Excellent effect with improved efficiency.

Continuation of the front page (56) References JP-A-63-227886 (JP, A) JP-A-57-183418 (JP, A) JP-A-58-144111 (JP, A) JP-A-51-116210 (JP) , A) Japanese Utility Model Showa 51-117001 (JP, U) Japanese Patent Publication 399-1916 (JP, B1) (58) Fields investigated (Int. Cl. ⁶ , DB name) D21F 1/10 D01F 6/80 311

Claims (4)

(57) [Claims] An abrasion-resistant endless papermaking woven fabric in which a monofilament having a heat shrinkage of 8% or more in boiling water for 20 minutes in boiling water made of nylon 6 and nylon 6.6 is nylon. . 2. Nylon 6 arranged on a weft and nylon 6
・ Nylon monofilament copolymerized with 6 has a high water absorption
The abrasion-resistant endless papermaking fabric according to claim 1, wherein the fabric is 12% or more monofilament. 3. Nylon 6 and nylon 6.
Nylon monofilament copolymerized with 6
Heat shrinkage of more than 8% for 10 minutes at 140 ° C for 10 minutes
The abrasion-resistant endless papermaking woven fabric according to claim 1 or 2 which is a monofilament of not less than%. 4. A wear-resistant endless papermaking woven fabric in which monofilaments of the copolymerized nylon according to any one of claims 1 to 3 are woven by arranging at least 25% on a weft forming a wear surface.