Blow Molding
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HDPE drum '2079851475616104457 wall thickness unevenness
Problem Phenomenon
The wall thickness distribution of the hollow blow molded drum is uneven, the shoulder and bottom are thin, and the drop test breaks at the thin areas.
Cause Analysis
Parison sag unbalances the axial wall thickness distribution; excessive blow-up ratio or uneven parison temperature also causes local thinning.; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
①Enable parison wall thickness program control; ②reduce parison temperature fluctuation; ③optimize the blow-up ratio design; ④adjust the pre-blowing and blowing timing.; after adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability
Key Takeaway
Hollow drum wall thickness relies on parison program and temperature management; wall thickness program control is the core configuration of extrusion '2079851475616104457.; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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