Injection Molding
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Deformation of PE Injection Molded Products After Packaging
Problem Phenomenon
Qualified PE parts warp and deform after packing and transportation, leading to customer complaints.
Cause Analysis
Products are packed before being fully cooled to room temperature; residual heat plus stacking load makes PE, which already has obvious creep, continue to slowly deform inside the package; an inner-liner design with locally concentrated stress also fixes the deformation into a specific shape, becoming a permanent defect by the time it reaches the customer.
Solution
①Fully cool products to room temperature before packaging; ②Optimize the packaging liner to distribute the load; ③Control the number of stacking layers and packing temperature; ④Design shape-setting liners for easily deformable parts; ⑤Evaluate the logistics environment temperature.
Key Takeaway
PE 'packing hot parts = secondary deformation': packing only after thorough cooling is the bottom line, and load distribution by the liner is the guarantee; PE creeps greatly, so the temperature and pressure in the logistics stage must both be taken into consideration.
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