Manufacturing method for high-modulus low-shrinkage PET industrial yarn

Abstract

The invention discloses a manufacturing method for high-modulus low-shrinkage PET industrial yarn, and the technological process of the method is as follows: hyperviscous melting to polyester fiber raw materials, metering, spinning, cooling, oil applying, stretching, hot shaping and reeled forming, wherein the cooling process sequentially comprises four parts including slow-cooling, pre-cooling, calm zone cooling and blow cooling, and the pre-cooling part adopts a passive hollow ring-shaped belt device. Through the introduction of the pre-cooling device, the irregularity caused by tows quivering produced under the down moving of a solidification point of fiber can be reduced, the deviation ratio of linear density can be controlled within a lower range, the purpose of reducing orientation and crystallization of embryo fiber is achieved, finally high-modulus low-shrinkage PET industrial yarn can be obtained, the high-modulus low-shrinkage PET industrial yarn has the advantages of high modulus, low dry heat shrinkage percentage, low breaking elongation and low linear density deviation ratio, and practical application can be well met.

Description

technical field [0001] The invention relates to a production method of polyester industrial yarn, in particular to a production method of high-modulus low-shrinkage polyester industrial yarn, belonging to the field of dry polyester industrial yarn manufacturing. Background technique [0002] Since the advent of polyester, it has achieved great development in industrial use. Polyester industrial yarn refers to high-strength, coarse-denier polyester industrial filament, and its fineness is not less than 550dtex. Polyester industrial yarn is widely used in industry because of its excellent physical and mechanical properties such as high initial modulus, high breaking strength, low elongation, and good impact resistance. It can be used as rubber for tire cords, cable covers, conveyor belts, etc. It can also be used as the skeleton material of plastic-coated fabrics, and can also be used as ropes, vehicle safety belts, conveyor belts, tarpaulins, coated fabrics, geotextiles, etc...

AI Technical Summary

Problems solved by technology

However, with the addition of the slow cooling device and the no-wind zone, the blowing position of the side blowing will move down, and the solidification point of the nascent fiber will move down, and the vibration of the tow will intensify, which will easily generate unstable air flow, which will aggravate the vibration of the tow, making the The melt is unstable after exiting the spinneret, and the spinning shape is affected to a certain extent. At the same time, the primary fiber stays for a long time near the crystallization area, resulting in excessively long crystallization of the primary fiber. Density unevenness increases and yield decreases

[0005] Existing studies have shown that there are many ways to obtain high-modulus low-shrinkage polyester industrial yarns. For example, Chinese patent CN02121141.8 obtains high-modulus low-shrinkage polyester industrial yarns by improving stretching and heat setting processes. Increase the viscosity of polyester slices to obtain high-modulus low-shrinkage polyester industrial yarns with dimensional stability. The diameter unevenness of polyester industrial yarns obtained in these studies is relatively high, and no consideration is given to improving the cooling process to obtain high-modulus low-shrinkage polyester industrial yarns , and a suitable cooling process can ensure the stability of the solidification point of the primary fiber, reduce the unevenness of the fiber diameter, stabilize the tow, and uniform cooling, so as to obtain polyester industrial yarn with high modulus and low dry heat shrinkage