Extrusion & Post
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PVDF Die Buildup and Drool
Problem Phenomenon
【Problem phenomenon】Precipitates gradually accumulate at the extrusion die opening to form buildup, which periodically adheres to the product surface forming scar spots
Cause Analysis
Low-molecular components and ingredients with insufficient compatibility in the formulation precipitate and accumulate under the action of die stress and surface energy; Arkema recommends the EXAD 3000 extrusion aid to increase lubrication and reduce die buildup
Solution
Add EXAD 3000 or similar aids to improve lubrication; optimize die temperature and die lip design to reduce dead spots; regularly clean the die opening and check the compatibility of formulation components
Key Takeaway
Die buildup is treated with special aids plus die temperature control; die cleaning only treats the symptoms; 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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