CN104250864A

CN104250864A - Method for adding melt dynamic monomer recovery to production process of regenerated polyester staple fiber

Info

Publication number: CN104250864A
Application number: CN201410245948.3A
Authority: CN
Inventors: 马晓鸿
Original assignee: Individual
Current assignee: Individual
Priority date: 2014-06-05
Filing date: 2014-06-05
Publication date: 2014-12-31

Abstract

The invention provides a method for adding melt dynamic monomer recovery to a fore-spinning production process of regenerated polyester staple fiber, and solves the influences of oligomer in regenerated polyester raw material, harmful gas and bubbles produced PVC in spinning melt on the operating environment and product quality in the field of regenerated polyester staple fiber. Addition of monomer recovery distillation column in the fore-spinning production process of the regenerated polyester staple fiber is by inputting cylindrical spinning melt output by a screw and a filter to the monomer recovery distillation column, uniformly distributing and converting the spinning melt into a multilayer thin film fluid, subjecting the melt to flash volatilization under particular process temperature and pressure, and extracting harmful gas, acetaldehyde and water violated from PVC decomposition by a negative pressure technology, and getting rid of bubbles in the melt to improve the quality of spinning melt and conveying spinning melt with high quality to a next process.

Description

Molten slurry dynamically de-single method is increased in regenerative polyester staple fiber production process flow process

Technical field:

The technological transformation of spinning production process before regenerative polyester staple fiber.

Background technology:

Before recycled polyester (terylene) staple fibre, the production process flow process of spinning is all adopt polyester slice spinning technique and spinning equipment to carry out spinning in the present situation of China at present, just have outside very little change in technological temperature and filtration link, other does not all change.When producing spinning grade polyester slicing product, the process of engineering to oligomer and non-polymer in early stage is relatively good by GB process, the gas decomposing oligomer generation in spinning process is less with the bubble ratio in molten slurry, do not have much pollutions to destroy to operator and working environment, bubble is very little to the quality influence of product.And adopt the waste polyester raw material spinning of reclaiming, mix because recycled polyester raw material compares, reclaim in waste and old raw material process have mix PVC (polyvinyl chloride), PE (polyethylene), PP (polypropylene), ABS (acrylonitrile-butadiene-styrene terpolymer) and some other non-polymer, although drop into the energy of a large amount of manpowers and at substantial to process the oligomer in Pillar recovery before spinning, but to be processed to reach Standard difficulty very large, and cost is very high.And also to add a large amount of brightening agents, delustering agent when adopting recycled polyester spinning.These oligomer are melted in slurry in the spinning of degree more than 280 and decompose the gas that volatilizes and can only to be pulled from spray silk by tow and take out of, containing a large amount of noxious materials in gas, have certain pollution to operator and surrounding air.Gas melts in spinning the bubble produced in slurry and has a strong impact on spinning quality.Private spinning enterprise is inadequate to this problem understanding attention degree for many years, and cause very large pollution to atmospheric environment, product quality also has serious problem.Searched out through test of many times the way solving this problem for addressing this problem us, a set of de-single tower apparatus through repacking is increased before former exactly in the spinning technological process of production, the technological parameter of single device is taken off according to spinning variety development, the garden cylindricality recycled polyester spinning exported at screw rod and filter is melted slurry to be input under a certain pressure in de-single tower and to be uniformly distributed and to be transformed into plural layers shape fluid, there is flash distillation volatilization in molten slurry under specific technological temperature and pressure, take out under the condition of negative pressure in recycled polyester spinning staple fibre process because PVC etc. decomposes the pernicious gas of volatilization, acetaldehyde, moisture content etc. also abolish the bubble produced in molten slurry, pernicious gas processes with regard to discharging in de-single device, reduce bubble to the impact of product.This dynamic approach solves recycled polyester spinning process and also improves product quality to the pollution that air causes simultaneously, decreases and reaches again the energy-saving and cost-reducing object reducing production cost to the workload of raw material sorting process aspect early stage.

Summary of the invention:

Increase a set of in regenerative polyester staple fiber production process flow process, the garden cylindricality spinning exported can be melted slurry be uniformly distributed the method i.e. de-single tower apparatus being transformed into plural layers shape fluid from screw rod and filter.By setting technique number, get rid of the gas bubbles of decomposing.

Accompanying drawing illustrates: Fig. 1 to increase after de-single tower spinning production process flow process before regenerative polyester staple fiber.

Detailed description of the invention:

Wave filter (No. 1) output spinning spinning process before regenerative polyester staple fiber cuts off the pipeline be connected with manifold, the delivery outlet of wave filter (No. 1) and (requirement of foundation spinning of de-single tower, spinning equipment spinning station number and spinning speed parameter and de-single tower of designing) input port connect, the delivery outlet of de-single tower is connected with wave filter (No. 2) input port.Wave filter (No. 2) delivery outlet is connected with spinning manifold.Increase de-this procedure of single tower when implementing to the umbrella shape number of plies in de-single tower.The design of umbrella shape size will by product variety requirement, spinning figure place in conjunction with spinning equipment designs, the general temperature of run parameter of de-single tower controls at these 265 DEG C-275 DEG C, and molten slurry operation enters the Stress control of de-single port at 2.5-5.5MPa, and vacuum degree control is at 0.025-0.04MPa.Operation aspect, when running for the first time, first close input, the output valve of No. 2 filters, vavuum pump can be opened when the molten slurry in de-single tower reaches 1/2 of tower height, then the input valve of No. 2 filters is slowly opened, slowly open the output valve of No. 2 filters when the pressure of No. 2 filters reaches requirement, molten slurry enters in spinning manifold.

Claims

1. before regenerative polyester staple fiber, spin the method that spinning process flow process middle filtrator rear end increases de-single tower apparatus, comprise the technological parameter of the position increased, the application increasing device, de-single stripper operation.

2. recycled polyester spinning garden cylindricality is melted the mode that slurry is transformed into the molten slurry of plural layers shape (umbrella shape).