Injection Molding
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PA66 glass fiber content selection
Problem Phenomenon
Products with insufficient fiber addition have large shrinkage deformation, products with excessive fiber addition have difficult filling and bulging
Cause Analysis
If glass fiber content is low, the support to suppress shrinkage is insufficient; if the content is too high, fluidity is poor and high injection pressure is required, and overfilled areas bulge; content selection must match the product wall thickness and area
Solution
①Select 30-35% glass fiber for conventional structural parts; ②Appropriately reduce fiber content for thin-wall large-area parts to preserve flow; ③Evaluate long glass fiber grades for high rigidity requirements; after adjustment, take continuous samples to verify the effect, confirm stability before resuming mass production
Key Takeaway
Glass fiber content is the first variable of PA66 modification; 30-35% is the balance point between rigidity and processability, special structures require case-by-case evaluation; after confirming effectiveness, fix the parameters and practices into the work instructions to prevent recurrence
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