Extrusion & Post
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Mold Sticking of PE Injection Molded Products (Soft Material)
Problem Phenomenon
Soft LDPE/LLDPE products are stretched and deformed during demolding and scratched by mold sticking.
Cause Analysis
Soft PE (LDPE/LLDPE) has low rigidity and low strength, so the product is easily stretched and plastically deformed during ejection; small draft angle, poor cavity polishing, excessive holding pressure, and insufficient cooling all further increase demolding resistance, making soft material more prone to mold sticking and scratching.
Solution
①Increase the draft angle; ②Polish the cavity along the demolding direction; ③Reduce holding pressure; ④Extend cooling to increase product rigidity; ⑤Enlarge the ejection area and balance ejection.
Key Takeaway
Soft PE demolding = the four-piece set of 'draft angle + polishing + ejection area + cooling': the softer the material, the more 'gentle' demolding must be; any concentrated force will leave permanent deformation.
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