Extrusion & Post
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PVDF Film Processing and Pore Control
Problem Phenomenon
【Problem phenomenon】In the extrusion and stretching of PVDF water treatment membranes and battery separators, porosity and pore size distribution fail to meet requirements
Cause Analysis
The membrane pore structure depends on the casting solution formulation, coagulation bath conditions, or stretching process parameters, and temperature and humidity fluctuations cause pore size drift; extrusion-grade PVDF used for filtration, separation, and separators has extremely high requirements for pore structure consistency
Solution
Lock the coagulation bath temperature and humidity or the stretching ratio and temperature according to the membrane process route; online monitor thickness and air permeability for feedback adjustment; incorporate raw material batch molecular weight differences into process fine-tuning
Key Takeaway
The soul of PVDF membranes lies in the pore structure; process parameters must be controlled in an online closed loop; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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