A production control system for a polytetrafluoroethylene-based microporous filtration membrane

CN121900350BActive Publication Date: 2026-05-29ZHANGJIAGANG LVHUAN MASCH CO LTD
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHANGJIAGANG LVHUAN MASCH CO LTD
Filing Date
2026-03-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

In the current production process of polytetrafluoroethylene microporous filter membranes, the lack of a self-evaluation mechanism in process control makes it difficult to guarantee the consistency of the microporous structure and the stability of the permeation performance of the filter membrane, resulting in low production efficiency and difficulty in guaranteeing the yield of large-scale production.

Method used

An adaptive closed-loop control architecture based on multi-level quality feature fusion is constructed. By acquiring and adjusting multiple process parameters, including mixing ratio, calendering thickness, longitudinal stretching ratio and transverse heating power, dynamic monitoring and closed-loop control are achieved. Parameter optimization is performed using thickness deviation and air permeability feedback.

Benefits of technology

It effectively improves the uniformity of the microporous structure of the filter membrane and the stability of its air permeability, ensuring the quality consistency and yield of large-scale production, and overcoming the performance fluctuation problem caused by open-loop decoupling of process parameters.

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Abstract

The present application relates to the technical field of microporous filtration membrane, and particularly relates to a production control system of a microporous filtration membrane based on polytetrafluoroethylene, which comprises an acquisition module, an adjustment module, a correction module, an updating module and an early warning module. The present application actively compensates for the unevenness of the base band by adjusting the draw ratio, pre-corrects the calendering deviation before longitudinal extension, further introduces the quality deviation degree to correct the transverse stretching heating power, and reversely optimizes the power correction coefficient and the mixing ratio through the threshold comparison and stability analysis of the adjustment index and the correction index, so as to realize the closed-loop setting of the front-end formula parameters from the performance of the rear section, and trigger the hierarchical early warning based on the double-exponential deviation degree, thereby effectively overcoming the problems that the microporous structure uniformity of the finished filter membrane is poor, the air permeability performance fluctuates greatly and the yield of large-scale production is difficult to guarantee due to the open-loop decoupling of the process parameters and the lack of feedforward adaptive adjustment.
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