Blow Molding
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HDPE '2079851475616104457 excessive flash
Problem Phenomenon
The flash at the bottle mouth and bottom mold line is thick and difficult to trim.
Cause Analysis
Excessive extrusion pressure/back pressure, improper pre-blowing pressure, poor mold parting line fit.
Solution
①Reduce extrusion pressure/back pressure; ②adjust the pre-blowing pressure; ③overhaul the mold parting line fit; ④check the clamping force.
Key Takeaway
For large flash, reduce pressure first, then check mold fit.
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