Extrusion & Post
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HDPE sheet extrusion
Problem Phenomenon
HDPE sheet thickness is uneven, melt fracture marks appear on the surface, and winding is uneven
Cause Analysis
Uneven die lip gap in sheet extrusion causes thickness deviation; too high line speed produces melt fracture; improper calendering roll temperature affects surface quality; when troubleshooting on site, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solution
①Precisely adjust the die lip gap; ②control the line speed below the critical shear or add PPA; ③optimize the calendering roll temperature; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
HDPE sheet quality is the product of die lip precision and speed control; precise adjustment plus additive coordination; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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