Injection Molding
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PARA Injection Pressure and Glass Fiber
Problem Phenomenon
PARA injection pressure is set improperly; insufficient pressure gives poor filling, excessive pressure gives warpage, difficult demolding and flash.
Cause Analysis
Higher injection pressure benefits filling, improves glass fiber dispersion and reduces shrinkage, but increases shear stress and orientation, easily causing warpage deformation, demolding difficulty and even flash; the higher the glass fiber content and the longer the length, the greater the injection pressure should be.
Solution
①Appropriately increase on the basis of slightly higher than non-reinforced plastic injection pressure; ②Adjust according to glass fiber content and length; ③Weigh filling against warpage and demolding; ④Multi-stage injection balancing.
Key Takeaway
PARA injection pressure is a balance between filling and side effects; glass fiber content and length are the pressure setting basis; multi-stage injection is the optimization means.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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