Material Drying
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HDPE '2079851475616104457 parison bubbles
Fenómeno do problema
Bubbles are visible inside the parison, and weak spots appear in the container wall after '2079851475616104457.
Análise das causas
Raw material moisture, feed section cooling leakage, screw and barrel wear entraining air; high regrind ratio with fine powder also brings air.
Solução
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.
Conclusão principal
For parison bubbles, check water first, then wear and regrind.
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