Processing Machinery
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LCP Excessive Holding Pressure Internal Stress
Problem Phenomenon
Product has large internal stress, warpage, or cracking at weld lines.
Cause Analysis
LCP shrinkage in the flow direction is near zero, so holding pressure demand is far lower than conventional materials; excessive holding pressure instead presses in too much material and generates stress.; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based solely on experience
Solution
①Control holding pressure at 40~60MPa light holding; ②shorten holding time; ③set according to the product weight stabilization point; ④verify the stress level has decreased.; after adjustment, continuously sample to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LCP requires light holding pressure; the near-zero shrinkage characteristic determines that its holding strategy is opposite to conventional plastics.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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