Material Drying
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HDPE '2079851475616104457 parison bubbles
Fenómeno del problema
Bubbles are visible inside the parison, and weak spots appear in the container wall after '2079851475616104457.
Análisis de la causa
Raw material moisture, feed section cooling leakage, screw and barrel wear entraining air; high regrind ratio with fine powder also brings air.
Solución
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.
Conclusión clave
For parison bubbles, check water first, then wear and regrind.
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