Injection Molding 2 views

PP Injection Cycle Fluctuation Material Shortage

Problem Phenomenon

Short shots and normal parts alternate.

Cause Analysis

Unstable feeding (bridging), check ring wear, and cushion fluctuation cause different shot volumes per cycle.

Solution

①Check hopper feeding; ②measure cushion fluctuation; ③check the check ring; ④stabilize back pressure.

Key Takeaway

For alternating shortage, check the metering system.

PP;short shot;metering;check ring;bridging

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