Extrusion & Post
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PVDF Extrusion Gel Particles and Gels
Fenómeno del problema
【Problem phenomenon】Gel particles and gels appear on the surface of PVDF films and sheets, impairing optical and barrier properties
Análisis de la causa
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
Solución
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
Conclusión clave
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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