Material Analysis
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Secondary deformation of PP products after packaging
Problem Phenomenon
Qualified PP parts warp and deform after being boxed and transported; customers receive nonconforming products and the return rate is high.
Cause Analysis
The products are boxed before being fully cooled; the residual heat plus the stacking load causes PP to creep and deform; unreasonable packaging liner design and concentrated local force also press out permanent deformation.
Solution
①Package the products only after they are fully cooled to room temperature; ②optimize the packaging liner to distribute the stacking load; ③control the packing quantity and number of stacking layers; ④evaluate the product temperature at packing; ⑤design special shape-setting liners for easily deformed parts.
Key Takeaway
PP 'packing hot parts = a source of secondary deformation': write 'cool thoroughly before packing' into the SOP and optimize the liner to distribute the load; many 'mold deformation' complaints are actually caused by the packaging and logistics links.
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