Injection Molding
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Gas-assisted injection is used to reduce shrinkage and warpage but parameters are set improperly
Problem Phenomenon
Gas-assisted injection is used to reduce shrinkage and warpage but parameters are set improperly
Cause Analysis
Improper gas injection timing, too early gas breakthrough or too late gas channel not formed
Improper gas pressure setting, unstable gas channel dimensions
Unreasonable gas channel design, gas cannot flow along the predetermined path
Gas overflow, bubble marks appear on the product surface
Cellulose acetate butyrate melt viscosity affects gas penetration depth
Solution
Gas injection timing when the melt is 70-90% filled
Reasonably set gas pressure 5-15MPa
Reasonably design the gas channel path
Prevent gas overflow, sealing design
Adjust gas parameters according to cellulose acetate butyrate viscosity
Key Takeaway
Gas assist requires precise timing and pressure control
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