Processing Machinery
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PA6 Glass Fiber Orientation Warpage
Problem Phenomenon
Glass fiber reinforced PA6 long strip products bend obviously along the length direction
Cause Analysis
Glass fibers orient along the flow direction, shrinkage in the orientation direction is small while perpendicular shrinkage is large, and when the flow of long strip products is single, anisotropic shrinkage causes bending; during on-site troubleshooting, verify item by item according to this mechanism, avoiding blind machine adjustment based only on experience
Solution
Use multi-point feeding or change the gate position to make the flow symmetric; reduce injection speed to weaken orientation; raise mold temperature to homogenize shrinkage; add reinforcing ribs structurally to resist bending; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Glass fiber orientation warpage must be addressed from the feeding scheme; process can only alleviate but not eradicate it; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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