Extrusion & Post
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PVDF Extrusion Gel Particles and Gels
Problem Phenomenon
【Problem phenomenon】Gel particles and gels appear on the surface of PVDF films and sheets, impairing optical and barrier properties
Cause Analysis
High-temperature long-time exposure, high-molecular-weight components, and in-die crosslinking form gels; stagnation at dead spots in the screw mixing section is a breeding ground for gels; the LG Chem manual recommends optimizing screw design, shortening residence, and strengthening filtration
Solution
Optimize the screw to eliminate stagnation dead spots and shorten residence time; increase screen mesh count to intercept gels; distinguish gel particle types (spherical gel/carbide/foreign matter) and treat accordingly
Key Takeaway
Gel particles and gels originate from stagnation and crosslinking; screw optimization plus filtration is applied together; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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