Molding Process
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HDPE glass fiber reinforcement
Problem Phenomenon
Glass fiber reinforced HDPE parts have aggravated warpage, surface floating fibers, and stronger shrinkage directionality
Cause Analysis
Glass fiber orientation greatly reduces shrinkage in the flow direction while the transverse direction remains unchanged, aggravating anisotropy; fibers floating up to the surface form floating fibers; reinforced grades have lower shrinkage but stronger directionality
Solution
①Gate position controls fiber orientation; ②raise the mold temperature to improve the surface; ③correct the mold shrinkage allowance according to the reinforced grade; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Glass fiber HDPE trades directionality for strength; orientation design and shrinkage correction are compulsory lessons for the mold; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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