Material Drying
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HDPE injection molded product bubbles
Problem Phenomenon
Internal holes in thick-walled HDPE parts.
Cause Analysis
Insufficient holding pressure in thick walls causes vacuum bubbles; regrind with moisture causes air bubbles.
Solution
①Strengthen holding pressure; ②dry the regrind; ③lower the melt temperature; ④improve venting.
Key Takeaway
First distinguish vacuum bubbles from air bubbles.
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