Composite shell-core high-shrinkage polyester staple fiber and preparation method thereof

Abstract

The invention discloses a composite shell-core high-shrinkage polyester staple fiber and a preparation method thereof. The preparation method comprises the following steps: by taking dried high-shrinkage polyester sheets as a shell layer and dried common polyester sheets as a core layer, controlling the mass ratio of the shell layer to the core layer within (3:7)-(4:6), carrying out extrusion melting on a shell layer component and a core layer component by using respective screw rod extruders so as to obtain melt, further carrying out spinning, annular blown air cooling, coiling and molding soas to obtain raw silk of a double-component shell-core structured fiber; further implementing procedures of after spinning bundling, primary traction, secondary traction, silk overlapping, coiling, oiling, drying and cutting on the raw silk, thereby obtaining a shell-core structured high-shrinkage polyester staple fiber. The shrinkage rate of the high-shrinkage polyester staple fiber disclosed bythe invention is up to 65+ / -5%, in addition is concise and smooth in process, controllable in process and remarkable in cost economy advantage, and 10-15% of raw and auxiliary materials can be saved.

Description

technical field [0001] The invention belongs to the technical field of polyester staple fiber preparation, and in particular relates to a skin-core composite high-shrinkage polyester staple fiber and a preparation method thereof. Background technique [0002] High-shrinkage polyester staple fiber is a polyester staple fiber with a potential high boiling water shrinkage rate. Generally, polyester staple fibers with a boiling water shrinkage rate of not less than 35% are called high-shrinkage polyester staple fibers. It can be combined with low shrinkage Or non-shrinkage fibers are blended into yarns, and then boiled in a state of no tension, etc. At this time, the high-shrinkage polyester staple fibers in the yarn complete immediate shrinkage, and other low-shrinkage or non-shrinkage fibers are significantly affected by the presence of high-shrinkage polyester fibers. The difference in shrinkage rate makes the yarn curl into loops, making the yarn fluffy and round like wool y...

AI Technical Summary

Problems solved by technology

[0006] In the present invention, high-shrinkage polyester chips are used as cortex raw materials, conventional polyester chips are used as core layer raw materials, and composite spinning equipment is used to compound the skin and core according to a certain ratio to prepare high-shrinkage polyester staple fibers, so that the prepared fibers overcome the traditional The boiling water shrinkage of the high-shrinkage polyester staple fiber prepared by the all-physical method decreases significantly with the increase of storage time, and the fiber cannot complete shrinkage in boiling water immediately, and it is difficult to stably prepare polyester staple fibers with a boiling water shrinkage of more than 55.0%. The quality of the high-shrinkage polyester staple fiber prepared by the traditional chemical-physical modification method, and the cost of fiber raw materials can be significantly reduced compared with the traditional chemical-physical modification method, and the competitiveness of the product can be significantly improved