A new method for manual control of viscosity

Abstract

The present invention relates to a new method for manual viscosity control, including guiding melt viscosity control when production conditions change; the specific control process is as follows: Abnormal production conditions are found → spinning pipeline pressure detection system detects Out of the melt pressure in the pipeline → calculate the filter pressure difference and booster pump speed 40 minutes ago → convert the melt viscosity drop through the pressure conversion formula 1 and the correction formula 2 of the actual viscosity change → use the converted melt viscosity As a production guide to adjust process conditions such as vacuum degree → realize manual control of melt viscosity. The advantages of the present invention are: adopting the above control method to realize the melt viscosity control, because the pressure change of the melt is detected online and the viscosity drop of the melt is converted by using the empirical formula to finally realize the control of the melt viscosity, and the equipment input cost is low. Simple installation and convenient operation.

Description

【Technical field】 [0001] The invention relates to the field of quality control of polyester products, in particular to a new method for manual viscosity control. 【Background technique】 [0002] One of the key indicators of polyester product quality is viscosity, which is currently the most important quality control parameter in polyester fiber production. The quality of viscosity control largely determines the quality of the final product. At present, the commonly used viscosity testing method generally uses a viscometer for on-line automatic control, but because the equipment is relatively precise, it is easily disturbed by some external factors such as temperature and pressure changes, and it is prone to failure. At this time, manual control becomes a difficult problem. According to the conventional manual control method, its CPK is generally only about 1.03, and the stability can only barely meet the production needs, and there is a risk of product degradation due to con...

AI Technical Summary

Problems solved by technology

Its disadvantages are: 1. The oscillating viscometer is easily disturbed by some external factors such as temperature and pressure changes, and it is prone to failure, which will also affect the accuracy of the subsequent viscosity correction value

2. In the viscosity detection equipment, both viscosity signal detection device and pressure signal detection device are included, the equipment is complicated, the initial equipment investment cost and the later equipment maintenance cost are relatively high

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