Injection Molding
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Insufficient Flow Length Ratio in PU '2079851475616104452
Problem Phenomenon
PU '2079851475616104452 flow length ratio only 80-100, below 150, thin-walled products cannot be filled
Cause Analysis
PU melt viscosity high, flow distance short; injection temperature too low; injection pressure insufficient; mold runner resistance large
Solution
1) Increase injection temperature to 60-120°C; 2) Increase injection pressure 80-100MPa; 3) Enlarge runner and gate dimensions to reduce resistance; 4) Add 0.3-0.5wt% flow aid to reduce viscosity
Key Takeaway
Insufficient flow length ratio is caused by PU high viscosity; high temperature, high pressure and large gate are key
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