JPS5823932A - Sewing machine yarn - 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 mainly uses wholly aromatic poly-
The present invention relates to a sewing thread made of chiramido fiber (referred to as "chirumo ether ymid fiber"), and more specifically, to a sewing thread that can be sewn at high speed.

Sewing thread is a sewing thread used when sewing clothes or industrial materials with a sewing machine, and there are multiple issues to be solved: improving sewability and preventing a decrease in strength due to frictional heat during II production.

In other words, in order to speed up sewing operations, the rotational speed of sewing machines has been rapidly increasing. s
High-temperature frictional heat is generated by mutual friction between the sewing needle and sewing thread. For this reason, the synthetic fibers/threads that have been commonly used in the past are often unusable due to thread breakage during sewing or poor strength and low weight after sewing. This is especially true when sewing dense, thick woven or knitted fabrics with high yarn tenacity and low yarn elongation.

Conventionally, the materials for sewing thread have been cotton thread, natural fibers such as silk thread, polyester fiber, and synthetic fibers such as 1497m1 IIT vinylon fibers. Although it has excellent heat resistance, the initial strength of cotton thread is low, and the performance of K, which is used as sewing thread for high-speed rotation, is still insufficient.

In addition, in recent years, as a method to improve heat resistance from a processing technology perspective, sewing thread has been treated with silicone oil to improve its smoothness. 5.Therefore, an example of a sewing thread using heat-resistant polymetaphenylene inphthalamide fiber (hereinafter referred to as polymeta fiber, for example Konex trademark) has been disclosed. Sewing thread J made from filament yarn or spun yarn mainly composed of group polyamide fibers (1983-
No. 87736 (hereinafter referred to as prior art 1) discloses an example using a fiber material (polymeta fiber).It is true that prior art 1 has higher heat resistance than sewing thread made of conventional fibers. However, in the case of polymeta fibers, the initial strength is not sufficient for high-speed rotation sewing threads.Also, in terms of heat resistance, polymeta fibers are inferior to loosely oriented type ARA1D fibers. It has been known.

On the other hand, as a result of a detailed study of the characteristics of -L-thylamide twill fiber, the present invention found that Aena 47 mid fiber has high strength,
It was discovered that it is superior to polymeta fibers in terms of heat resistance, etc., and therefore, when used as a sewing thread, it is possible to provide a sewing thread with even higher K than polymeta fibers, leading to the present invention.

In particular, the aromatic polyether 7-mid fiber has a repeating phase (
11~a4) -N-Ar, -N-・・・・・・・・・・・・・・・(
凰11 R3 hole-C-Arm-C-・・・・・・・・・・・・・・12+
111 0 0 R, O R49 [In the formula, Ar, + Art + Ar, may be the same or different, and are aromatic carbocyclic residues in which bonding chains extend in the same or parallel axes, Represents the aromatic heterocyclic residues that must be bonded to the ring atoms representing the maximum spacing and their combinations 1) -1゜Bi~R1 may be the same or different, and has a carbon prime number of 5 or less. Represents a furkyl group and a hydrogen atom.

”(l Ar may be the same or different, and may be a p-phenylene group or a meta-phenylene group if tL 4゜)
, and the relationship between the number of moles of repeating units is implicitly ui
+141 = +21, (11+l!l++31
++41=100 molti 4) If (3)=O~
90771%, (41=50-5 molt, preferably (
Aromatic carbocyclic residues in which bond chains extend in the coaxial direction are, for example, 1,4-pherene, 1,4-7, etc. Examples of aromatic carbocyclic residues with bond chains extending in the parallel axis direction include tyrene, etc.
It means 7 tyrene, etc.

The aromatic residue is -N=N-, -N=CH-.

r selected from the group consisting of -CH=CH-, -C4ifC-
They may be bonded to each other through an L group. For example, etc.

Examples of the furkyl group having carbon #5 or less include a methyl group, an ethyl group, a propyl group, a butyl group, a pentyl group, and the like, but a methyl group is preferable.

A r4 + A r= in formula (4) may be the same or different and is selected from a paraphenylene group and a metaphenylene group.

The above aromatic carbocyclic residues and aromatic, 11-substituent ring residues are bonded with substituents to the longitudinal atom. (e.g., chlorine, bromine, fluorine), lower alkyl groups (e.g., methyl, ethyl, isobutyl, n-propyl groups), lower alkoxy groups (e.g., methoxy, ethoxy groups), cyano groups, 7-cetyl groups,
Examples include nitro group, preferably #1 car group and methyl group.

The structure of the sewing thread of the present invention varies depending on the oil used, but
Generally, the following configuration is preferred. It is desirable that the single yarn denier of the fiber is 1 denier υ or more and 5 denier or less. If the denier is less than 17', the single fibers will be too thin and will easily break when processed into sewing thread, and if the denier is more than 5 denier, the 5J flexibility of the fiber will be low, making it difficult to obtain a good sewing thread. do not have. The total fineness of the fiber is from 6u to 2
A range of 0.00 denier is preferred.

This is bundled into a filament thread with a density of 500 to 11 per meter.
G (2 to 10 pieces that have been twisted once (first twist) are gathered together and twisted in the opposite direction to the first twist 300 to 800 times per 1111 (first twist).The number of twists per 1111 during first twist is If the number of twists is less than 500 times, the convergence of the sewing thread is insufficient and the sewing thread tends to separate into single fibers on the surface of the fabric during sewing, which is undesirable.If the number of twists is more than 1100 times, the internal strain of the fiber is larger than that of twist K. A decrease in strength can be seen.

In addition, in order to improve the smoothness of the sewing thread, it is preferable to add mineral oil to the silicone oil in a slender t-a% (relative to the fiber).

The sewing thread of the present invention is suitable as a sewing thread for high-speed sewing, and the maximum sewing speed of commercially available sewing machines is 550 U.
Even when sewing at rpm, no decrease in the strength of the sewing thread after sewing is observed. In addition, it is more than twice as strong as conventional polyester sewing thread, so it can be used for thick fiber industrial materials such as narrow thick edge belts, canvases, and other general industrial materials.
It has become possible to use thinner sewing threads in fields where large sewing threads were required.

Examples are shown below to specifically illustrate the present invention.

Example 1 The wholly aromatic polyether 7mide S&fiber was a 100 denier 50 fibre, obtained by wet spinning Arashi itself, which consisted of 25 moles of para-phenylene diamine, 5 moles of phenyl ether, and 25 moles of phenyl ether. First twist 7 to the filament fiber (hereinafter referred to as Edelua ζF fiber A).
0 0 1iI) are bundled into three strands,
1st g shows the results of a performance comparison between a sewing thread made by twisting 4 5 0 1 il of ply twist and a sewing thread made of ester edge fibers or a sewing thread made of horimeta fibers! ! #
C shown.

Table 1 The sewing thread strength and elongation measurements were carried out under the following conditions.

1 Schiff: DDC-227JuKi needle: DB
Xl$t4 Rotation speed: 4500 rpm Strength and elongation measurement: Instron tensile tester Sewing fabric: Polyester fiber/Rain 3 kA fiber (6s
/a5), Surge, 4-ply sewing method: Straight stitch patent applicant Teijin Ltd.

Claims (3)

[Claims] (1) Sewing thread characterized by being made by twisting filament yarn or spun yarn mainly consisting of wholly aromatic polyetheramide fiber as a fiber material for sewing thread. (2) The plated aromatic polyetheramide fiber consists of the following repeating units (11 to (4))
) Sewing thread 1- -C-Ar, -C-・・・・・・・・・・・・・・・
(2) 111 0 0 Bird O R,R. [In the formula, Arl + Ar,, Ar, may be the same or different, and are aromatic carbocyclic residues whose bonding chains extend in the same or parallel axes, bonded by ring atoms representing the maximum spacing. Must be aromatic polycyclic residues and these '/)! 11 Represents the intersection.也 to R11 may be the same or different, and represent an alkyl group having an it number of 5 or less and a hydrogen atom. "a + Ar, may be the same or different, and is selected from paraphenylene group and metaphenylene group. The relationship of the number of moles of repeating units is substantially K lu +141
= 421 and! 11 + +21 + (3) +1
41 = 10 u −f zL, 18)
m O~904 le94, 12+z 50~S morch. ] (3) The repeating unit (1), mul, is paraphenylene and is an island. Both birds are hydrogen atoms, and Ar of the repeating unit (2),
is paraphenylene, and the repeating single If (A of 31
r is paraphenylene and - is water 1R. Sewing thread according to claim (2) +41 Repeating unit (4) R,, R1 is a hydrogen atom, Ar, or paraphenylene, Ar is paraphenylene/or paraphenylene Sewing thread according to any one of paragraphs (2) to (3)