Injection Molding
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EVOH injection flow length ratio is insufficient
Problem Phenomenon
EVOH injection flow length ratio only 80-100, below 150, thin-wall products cannot be filled
Cause Analysis
EVOH melt viscosity high with short flow distance; injection temperature too low; injection pressure insufficient; mold flow channel resistance large
Solution
1) Increase injection temperature to 190-230°C; 2) Increase injection pressure to 80-100MPa; 3) Enlarge flow channel and gate sizes to reduce resistance; 4) Add 0.3-0.5wt% flow aid to reduce viscosity
Key Takeaway
Insufficient flow length ratio is caused by EVOH's high viscosity; high temperature, high pressure, and large gates are key
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