Injection Molding
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ABS cushion fluctuation causing alternating short shot and flash
Problem Phenomenon
Under the same process, short shots and flash of the product appear alternately, with large weight fluctuations.
Cause Analysis
The check ring is worn or stuck, causing the melt to flow back during injection, and the actual shot volume is unstable; the cushion fluctuates large and small.
Solution
①Detect the cushion fluctuation (30 consecutive shots); ②disassemble and inspect the check ring wear and replace it; ③clean foreign matter at the screw head; ④stabilize the back pressure and speed.
Key Takeaway
When short shots and flash appear alternately, suspect the check ring first.
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