Extrusion & Post
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HDPE extrusion sheet melt fracture
Problem Phenomenon
The HDPE sheet surface is periodically rough.
Cause Analysis
Exit shear exceeds the critical value; low die temperature and fast speed.
Solution
①Increase the die temperature; ②reduce speed; ③polish the die lip; ④add PPA processing aid.
Key Takeaway
Exit roughness = raise temperature, reduce speed, add aid.
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