Sea-island fibre and preparation method thereof

Abstract

The invention discloses a sea-island fibre and a preparation method thereof. A PTT (polytrimethylene terephthalate) slice is taken as an island component, a COPET (copolyester) slice is taken as a sea component, the two raw materials are respectively dried, extruded and molten, then the melts are fed into a spinning box and then are extruded out after being accurately metered by a metering pump, the island component is uniformly distributed into the sea component, the island component and the sea component are sprayed out from a same spinneret orifice, then cooling, moulding, oiling, drawing based on a silk guiding roller, winding and silk doubling are carried out to obtain a PTT sea-island fibre, the breaking strength of the fibre is 2.8-3.7cN / dtex, the breaking elongation is 57-62%, and the evenness uster value is less than 1.3%; and the filament number of the island component PTT is 0.05-0.20DPF. The sea-island fibre product not only has the characteristics of a common sea-island fibre but also has the characteristics of high elasticity, lodging resistance, high dyeing degree, high colour fastness, bright finished product colour, no wrinkling, easy care and memory function, thus the sea-island fibre is an ideal fibre used for a top-grade garment material and has great market potential.

Description

technical field [0001] The invention relates to a synthetic fiber and a spinning process thereof, in particular to a sea-island fiber and a preparation method thereof. Background technique [0002] Sea-island fiber is a kind of composite fiber. After processing and finishing, the thinnest fiber in the world can be obtained. It is an ideal material for producing high-grade clothing fabrics and high-grade decorative fabrics. At present, the sea-island fibers produced generally use full-dull and semi-dull (PET) as the raw material of the island phase, and water-soluble chips (COPET) as the raw material of the marine phase. After drying, extrusion, and melting, they are sent to the spinning box for spinning The metering pump is accurately metered, and then distributed to each spinning component, the island component is evenly distributed in the sea component, and extruded together into the composite component to form a sea-island fiber, which is made into a sea-island POY or a s...

AI Technical Summary

Problems solved by technology

This technology adopts the blend spinning process, and its disadvantage is that the blending uniformity of the two polymers is poor, and the sea-island fiber will form longitudinal unevenness and excessive or insufficient fiber opening after fiber opening. This kind of PTT sea-island fiber Type short fibers cannot be directly used for weaving; at the same time, PE can only be dissolved by strong acid at high temperature, which is very unfavorable to the environment and personnel safety

[0005] So far, with PTT as the island component and COPET as the sea component, the preparation of superfine PTT long fibers with direct weaving ability has not been reported

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