Material Drying
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Bubbles at LDPE Blow Molded Bottle Mouth
Problem Phenomenon
Bubbles and material shortage at the bottle mouth cut.
Cause Analysis
The parison contains air or gas is sealed when material is trapped at the cut; raw material contains moisture and back pressure is insufficient.
Solution
①Dry the raw material; ②increase back pressure; ③check the cutting mold; ④reduce extrusion pressure.
Key Takeaway
For bottle mouth bubbles, check moisture content and the cut.
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