JPS588196A - Papermaking dryer canvas - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention is a papermaking dryer canvas K1m mainly using wholly aromatic polyetheramide fiber (hereinafter referred to as etheramide fiber) as a material. The dryer canvas for yarn spinning is a cloth belt used for drying paper and is resistant to 11M.

Performance such as chemical resistance, heat resistance, durability, abrasion resistance, and dimensional stability are required. Conventionally, brocade, polyester, boria oxide, and polyacrylic fibers have been widely used as fibers for dryer canvases. Tsumugi has flexibility 1 surface smoothness,
After the appearance of rounded synthetic fibers, which have excellent water absorption properties, they deteriorate greatly due to high temperatures and humidity, and have disadvantages such as the embroidered fibers being easily destroyed by overheating or moisture due to steam, and the need to avoid moisture during storage. Line ■ has become limited. Polyester fibers have excellent heat resistance, acid resistance, and stability in one dimension, and other properties are stable under normal conditions, so they are widely used as a general-purpose material due to their low price, but their temperature and heat resistance is insufficient. It is. The reason why polyester fibers have poor temperature and heat resistance is that the ester bonds in the polymer are poly! This is because it is susceptible to hydrolysis due to the presence of terminal carboxyl groups.In recent years, low carxyl group polyester fibers have been used as heat-and-moisture resistant polyester fibers, but their performance is still not sufficient. . Boria Zeta Fiber Co., Ltd. Although it has excellent abrasion resistance and relatively good heat and humidity resistance, it is difficult to use alone because of its large deterioration due to IIK. Furthermore, although polyacrylic fibers have excellent S heat resistance, they have insufficient tensile strength and abrasion resistance. As described above, when conventional fibers are used as materials for dryer canvases for paper manufacturing, they all have advantages and disadvantages, and none of them can sufficiently meet the needs and characteristics required.

On the other hand, as a result of a detailed study on the characteristics of ether amide fibers, the present invention found that ether amide fibers are superior to conventional fibers such as polyester woven fibers in terms of heat and humidity resistance, chemical resistance, heat resistance, durability, etc. Therefore, when used as a fiber for dotsyear canogas, it is smoother than conventional fibers.
It has been found that it is possible to provide an excellent dryer canvas for round wainscot paper, and the present invention is based on this invention.

However, aromatic polyether and fiber is a repeating unit (
1) to (4) Ra R 0 0 Rs O R4R1 [In the formula, Ar + I Art + Mrl may be the same or different, and are aromatic compounds in which the bonding chains extend in the same or parallel axes. represents the aromatic heterocyclic residues that must be bonded by a maximum spacing of 1,000,000, and combinations thereof.

R3-R8 may be the same or different and represent an alkyl group having carbon atoms of S or less and a hydrogen atom.

Mr4. The molecules r1 may be the same or have 4 different types, and are selected from 7 paraphenylene groups and metaphenylene groups. ], and the relationship between the number of cells in the repeating unit is substantially K (1) +
(4) −(z), and (1) + (2) + (
3) + (4) - 5007 If you are arrogant, (3)
-0 to 90 mol-, (4) -5o-i mol-1 mole, or (4) -10N10 mol-.

An aromatic carbon ring residue with a bond chain extending in the coaxial direction means, for example, L4-phenylene, L4-7 tyrene, etc., and an aromatic carbon ring residue with a bond chain extending in the parallel axis direction. The group means, for example, Ls-naphthylene, λ6-naphthylene, and the like.

The aromatic residue is -M-N-, -M-OH-.

-CFi-OH-, -0! K111 may be mutually linked by a group selected from the group consisting of O-, including, for example, K111.

Examples of the alkyl group having 5 or less carbon atoms include a methyl group, an ethyl group, a glopyl group, a butyl group, a pentyl group, etc., and a methyl group is preferable.

Mu r4 in formula (4). It may be mul@doka- or different, and is selected from para-phenylene group and meta-phenylene group.

Substituents may be bonded to the member atoms of the above aromatic carbon S residues and aromatic heteroaromatic residues. Such substituents include halogen groups (e.g. chlorine, bromine, fluorine),
Lower alkyl radicals (e.g. methyl, ethyl, inglovir, norw 62 a hir group), lower alkyl radicals! (1
The examples include methoxy, ethoxy, cyano, acetyl, and nitride groups, with chlorine and methyl groups being preferred.

The ether amide fiber from Tl14 is used as a fiber anchor for the paper dryer can AX, and has dramatically improved hydrolysis resistance, chemical resistance, and durability compared to conventional AT paper dryer canvas. It is something. Etheramide fibers include multifilament yarn and monofilament yarn.

Spun yarn or a composite yarn thereof can be selected. The weaving structure can be a conventional triple weave, a modified double weave, a collar (eight-ply weave, etc.), and other known methods. Conventional fibers such as polyester fibers may be mixed and twisted. A rounding resin treatment@Im or **kakuge treatment can be applied to improve the surface smoothness and flexibility.A flexible bulky yarn may be applied to a certain W-crossed single-layer weft.

The present invention will be specifically illustrated below using Examples.

Example 1 As a wholly aromatic polyether atom, 25 mol gs of pac enylene diane and 5 mol gs of terephthalic acid chloride were used.
07 Ru, Kame 4'-diaminodiphenyl ether 2s
11! obtained by wet spinning a polymer consisting of moles! (16
Denier 10007, latitude density 3s lines/inch, paper 11
? I created a double canvas consisting of s books/inch.
Table 11 shows the comparative evaluation results of canvases produced in the same manner as in Example 1 except that polyester fibers were used as the fiber material as a comparative example. Both numbers show a strong retention rate (regret) for non-deterioration.

Proverbs 1 Procedural Amendment Form March 1980 (0th Date: Mr. Commissioner of the Patent Office 1, Indication of the Case Patent Application No. 104538 No. 1983 2, Name of the Invention Paper Dryer Canvas 3, Person Making the Amendment Relationship to the Case Patent Application 1-11 Minamihonmachi, Higashi-ku, Osaka (300) Teijin Limited Representative Tomoo Tokusue 1) Horizontal column K for tensile strength in Table 1 of Purchase 10 of the specification
11. @JF/a*J and j LI I /as J toh 6't' r 7
-617d・'', respectively.

that's all

Claims (4)

[Claims] (1) #1-4I mold dryer canvas for papermaking, which is mainly made of fully aromatic polyetheramide fibers as the wire material (2) The papermaking dryer canvas N-m [1--... ...(l)'I ・Rr R snow o 1 0・ ・-N-Ar1-
C-...1...(3)l I+ Re 0 -N-Ar4-0-mr@-N-HHHH(4)1 R4'Rs. [In the formula, Ar+, Ar, and Arl are the same or may differ by 4 times, aromatic carbon product residues whose bonding chains extend in the co-K17 axis direction or in the parallel axis direction, aromatic carbon product residues, and groups representing the maximum spacing. Represents aromatic compounds, cumulative residues, and combinations thereof that must be linked by atoms, atoms, and children. Rr-Rs may be the same or different and represent an alkyl group having 5 or less carbon atoms and a hydrogen atom. Ar41 mur @ is Oka- but different -1 is also good, Pa 1
．． Laphenylene group and metaphenylene group are C1l. The relationship between the number of moles of repeating nests is essentially (1) + (4)
−(ri), (i) + (z) + (a) + (4) ””
In the case of 100 moles, (a) -O~*O mo#
-, (2) -s. ~5 moles I regret it. ] (3) Arl of repeating unit (1) is paraphenylene and R
1°R has many hydrogen atoms, the repeating unit is paraphenylene, and the repeating unit (3) is a hydrogen atom.
4 is paraphenylene and Rs is a hydrogen atom, the ear canvas according to claim S (2) (4) Claims 1 to 1, in which Ra and Rs of the repeating unit (4) are hydrogen atoms, 4 caparaphenylene, and 4 rI are paraphenylsine or metaphenylene. OII paper dryer canvas listed in any of the above