Processing Machinery
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PARA Screw and Check Valve
Problem Phenomenon
Unstable metering and melt backflow in PARA processing; improper screw compression ratio and check valve type configuration.
Cause Analysis
PARA recommends standard screw compression ratio 2:1~3:1, L/D 15:1~20:1; use a ring check valve rather than a ball type; improper configuration causes metering inaccuracy; high-viscosity melt has high sealing requirements.
Solution
①Screw compression ratio 2:1~3:1, L/D 15:1~20:1; ②Select a ring check valve; ③Regularly check check valve wear; ④Metering stability spot check.
Key Takeaway
PARA screw and check valve have explicit configuration specifications; the ring valve is the recommended type; wear checks keep metering stable.; after confirming effectiveness, solidify the parameters and practices into the work instruction to prevent recurrence
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