Material Drying
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PVDF Thick-Walled Rod Internal Bubbles and Voids
Problem Phenomenon
【Problem phenomenon】Concentrated bands of bubbles and voids appear in the cross-section of PVDF thick-walled rods, exposed after machining
Cause Analysis
Thick-walled rods cool slowly and have long compensation paths, so residual moisture, gas, and shrinkage voids concentrate in the core; insufficient raw '2079851475616104451 and excessive injection speed entraining air superimpose and aggravate
Solution
Dry the raw material at 80-100℃×2-4h to below 0.05% moisture; reduce injection speed to prevent air entrapment; stage and extend holding pressure for compensation; design rod molds with sufficient cooling and compensation channels
Key Takeaway
Core defects of thick-walled rods originate from insufficient drying plus inadequate compensation; treat both causes together; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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