A polylactic acid spinning box

Abstract

The invention provides a polylactic acid spinning box, the outer surface of the spinning box is covered with a thermal insulation layer for heat insulation; the metering pump seat on which the metering pump can be placed is relatively fixed to the assembly head cover that can fix the spinning assembly Inside the box; the metering pump seat and the component head cover are connected through the melt delivery pipe; the component cover is a hollow cylinder, which runs through the top and bottom of the box and is located in the front of the box; the melt inlet is located on the top surface of the box. The melt delivery pipe is connected to the metering pump feed port on the metering pump base, and a needle valve is arranged at the connection; heat medium pipes are evenly arranged inside the box, and the heat medium pipe inlet and heat medium pipe outlet are respectively set up and down. outside of the box. The polylactic acid fiber produced by the spinning box of the present invention can avoid thermal degradation of the polylactic acid in a molten state, and ensure that the fiber-grade polylactic acid material maintains excellent spinning performance in a hot state.

Description

technical field [0001] The invention belongs to the technical field of chemical fiber machinery manufacturing, and in particular relates to a polylactic acid (PLA) spinning box. Background technique [0002] Polylactic acid (PLA) fiber is one of the "green fibers" with great development prospects at present. It has the advantages of environmental protection, non-toxic, antibacterial, flame retardant, hypoallergenic, degradable, and renewable raw materials. Polylactic acid fiber has excellent physical properties and a wide range of uses. It has high dry and wet strength and initial modulus, and good dimensional stability. The fabric combines the comfort of cotton, the drape of viscose, the strength of polyester and the feel of silk. Excellent performance, widely used in clothing, fabrics, underwear, home textiles, sanitary materials, health care products and other fields. [0003] The spinning box is the key equipment in the short fiber melt spinning production line. Its fun...

AI Technical Summary

Problems solved by technology

The molecular composition and structure of polylactic acid and petroleum-based products such as polyester are very different. Polyester molecules are composed of short aliphatic hydrocarbon chains, ester groups, benzene rings, and terminal alcohol hydroxyl groups. The temperature resistance value is between 260-280 °C , and polylactic acid is obtained by the polymerization of lactic acid molecules, which is very sensitive to temperature. Once the temperature is high and it stays in the spinning box for a long time, it will cause its degradation or even carbonization, resulting in poor spinnability and difficulty in spinning

Using a conventional spinning box has the problems of long residence time of the melt, easy degradation, and affecting the spinning effect. It cannot be adapted to the spinning of new materials such as polylactic acid.

Therefore, there is an urgent need for a special spinning box for polylactic acid to overcome the problems of poor spinnability and difficult spinning of polylactic acid fibers.

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