PET/PTT bi-component comfortable stretch yarn preparation process

Abstract

The invention discloses a PET / PTT bi-component comfortable stretch yarn preparation process. The PET / PTT bi-component comfortable stretch yarn preparation process sequentially comprises the following steps that (1), solid-phase tackifying treatment and drying treatment are carried out on PTT slices, and the PTT slices are extruded into an auxiliary box body through a screw extruder A; (2), pre-crystallization treatment and drying treatment are carried out on PET slices, and the PET slices are extruded into a main box body through a screw extruder B; (3), the PTT melt in the auxiliary box body and the PET melt in the main box body are converged in a spinning nozzle through a PTT metering pump and a PET metering pump correspondingly and sprayed out to form composite silk threads, and when the PTT and the PET are sprayed out, a third melt is synchronously sprayed out between the PTT and the PET to form a reinforcing silk yarn clamped between the PTT silk yarn and the PET silk yarn; and (4), the composite silk threads form a curled comfortable elastic structure through drafting treatment and heat treatment. The prepared PET / PTT bi-component comfortable elastic yarn has relatively high strength and comfortable elasticity, further has relatively good supporting force, has a wider application range, has a temperature adjusting function, and is warm in winter and cool in summer; and the prepared short filament has the advantages of extremely light weight, high strength and high heat insulation and heat preservation capability.

Description

technical field [0001] The invention belongs to the technical field of fiber material preparation devices, in particular to a preparation process of PET / PTT two-component elastic yarn. Background technique [0002] At present, ordinary polyester fibers are gradually becoming saturated in the market due to their low added value and high degree of homogeneity. The research and development of differentiated polyester fibers such as self-curling fibers is becoming increasingly important. Usually, the crimped fiber is permanently crimped by physical and mechanical action through the crimping device of the fiber, while the self-crimping fiber does not need to be specially crimped, and only needs to be drawn and heat-treated to make its potential crimp appear. The processing cost of fibers can be significantly reduced. Side-by-side polyethylene terephthalate (PET) / polytrimethylene terephthalate (PTT) uses the large difference in heat shrinkage between the PET component and the PTT...

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Problems solved by technology

[0003] The existing PET / PTT two-component elastic yarn process has not made a breakthrough, and the application range of the elastic yarn prepared by it has been close to stagnation, and the pressure bearing capacity of the prepared elastic yarn is not strong. Proper pressure bearing capacity requires a large amount of extrusion filling, which increases the cost of the product and limits its scope of use

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