Polyester film harness wire and preparation method thereof

Abstract

The invention relates to a polyester film harness wire which is prepared by the following steps: forming a three-layer film by two surface layers extruded mutually and a core layer arranged between the two surface layers; and drawing the three-layer film. The surface layer film comprises 63-76.5% of semi-dull polyester chip by weight percent, 3-9% of antistatic agent by weight percent, 0.5-3% of color masterbatch by weight percent and 20-25% of anti-adhesion master batch by weight percent; the core layer film comprises 97-99.8% of semi-dull polyester chip by weight percent and 0.2-3% of colormasterbatch by weight percent; and the total thickness of the polyester film harness wire is 0.30-0.35mm, and the thickness of the isopachous surface layers is between 0.10-0.025mm. The invention hasthe characteristics of high comprehensive mechanical strength and good wear-resisting property.

Description

technical field [0001] The invention relates to a polyester film heddle and a preparation method thereof, belonging to the technical field of textile machinery accessories. technical background [0002] The heald is the equipment for weaving machine fabric - a large and consumable part of the loom. Generally, the heald is in the shape of a belt with a constant cross section, with heald ears at both ends, and a warp thread in the center for passing through and carrying the fabric. The healds are installed on the heald frame through the heald ears, and move up and down with the heald frame . The healds of this structure are generally made of stainless steel, which has the following disadvantages: expensive materials, complicated manufacture, heavy weight, easy to rust, large loss to the machine, and large energy consumption. [0003] And along with the development of plastic material, people gradually begin to use polyoxymethylene plastic heald instead of stainless steel hed...

AI Technical Summary

Problems solved by technology

The healds of this structure are generally made of stainless steel, which has the following disadvantages: expensive materials, complicated production, heavy weight, easy to rust, large loss to the machine, large energy consumption, etc.

However, polyoxymethylene material has a regular molecular structure and high crystallinity, which not only leads to a relatively high shrinkage rate, but at the same time, although the material has good tensile strength and fatigue resistance, it is also difficult to process, especially The heald is a thin-walled long strip product, which is difficult to form with ordinary injection molding machines and injection molds. Therefore, the current polyoxymethylene plastic healds are mainly injection molded by high-speed injection molding machines and hot runner moulds.

The polyoxymethylene plastic healds that adopt injection molding mainly have the following defects, which restrict the use of polyoxymethylene plastic healds

First, its wear resistance can not be compared with steel heddle

Spinning yarn passes through the eye of the heald, and rubs against the eye directly for one or two years. If the wear resistance of the eye is slightly insufficient, the frequency of broken yarn and fluffing will increase significantly , which seriously affects the quality of cloth and the efficiency of weaving

The dynamic friction coefficient of injection molded polyoxymethylene plastic healds is generally around 0.35. In actual use, polyoxymethylene plastic healds do have advantages in weaving some elastic, non-twisted, medium-thick yarns. However, once applied to heavy twisting , extinction and other varieties with relatively large friction, the spinning can drive the irregular movement of the polyoxymethylene plastic heddle, so that the cloth surface is not smooth

Second, poor environmental protection

POM is easy to be depolymerized by heat, has poor thermal stability, and is not resistant to acid and alkali. In the injection molding process of POM plastic healds, it will decompose and release formaldehyde gas during injection molding, which is harmful to the human body.

Third, the comprehensive mechanical strength is not high

In practice, it is common to install 12,000 steel healds, but almost less than 10,000 polyoxymethylene plastic healds. The thickness of the polyoxymethylene plastic heald once again restricts its application.

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