Molds & Tooling
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PP Long Glass Fiber LFT Processing
Problem Phenomenon
[Problem Phenomenon] Long glass fiber PP (LFT-PP) processing breaks fibers; strength not up to standard
Cause Analysis
LFT-PP fiber length is the key to strength; excessive shear (high back pressure and speed, small gates) cuts fibers and reduces strength; a dedicated low-shear process preserves fibers; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Low back pressure and low speed for LFT; large gates to reduce shear; dedicated screw; sample-check fiber length; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
LFT-PP preserves fiber length; low shear and large gates; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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