Material Drying
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HDPE '2079851475616104457 parison bubbles
Problem Phenomenon
Bubbles are visible inside the parison, and weak spots appear in the container wall after '2079851475616104457.
Cause Analysis
Raw material moisture, feed section cooling leakage, screw and barrel wear entraining air; high regrind ratio with fine powder also brings air.
Solution
①Dry the raw material (pre-drying recommended for HDPE regrind); ②check for cooling water leakage in the feed section; ③check screw wear; ④increase back pressure to vent.
Key Takeaway
For parison bubbles, check water first, then wear and regrind.
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