Blow Molding
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Wall Thickness Deviation of PE Hollow Containers
Problem Phenomenon
HDPE blow-molded barrels and bottles have locally too-thin walls, are crushed during stacking or rupture when dropped, and wall thickness distribution is out of control.
Cause Analysis
Improper parison wall thickness programming causes mismatch between material supply and blowing in each section, parison sag under its own weight makes the top thin and the bottom thick, and together with unreasonable mold pinch-off positions, the three superimpose to cause wall thickness distribution to go out of control; locally too-thin areas become weak points of strength and fail first during stacking and dropping.
Solution
①Optimize the parison wall thickness program curve (axial multi-point thickness adjustment); ②Control parison sag (lower temperature and increase speed); ③Adjust the mold structure and pinch-off positions; ④Use ultrasonic thickness measurement to monitor wall thickness distribution; ⑤Selectively thicken weak areas for stacking/dropping.
Key Takeaway
Blow-molded container wall thickness = 'parison programming + sag control': the wall thickness program is the lifeline curve of '2079851475616104457; only combined with sag control can material be distributed where it should be thick.
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