Processing Machinery
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Product defects caused by impurities mixed into random copolymer polypropylene raw material
Problem Phenomenon
Black spots, foreign particles or color difference areas appear on the product surface or inside.
Impurities not only affect appearance but also act as stress concentration points that reduce mechanical properties, and in severe cases cause the product to crack at the impurities.
Cause Analysis
(1) Impurities are mixed in during raw material packaging or transportation
(2) The hopper or conveying pipelines are not clean, with residual foreign matter
(3) Workshop environment contamination; dust and foreign matter fall into the raw material
(4) Other materials or impurities are mixed in during regrind processing
(5) Metal powder produced by equipment wear mixes into the raw material
Solution
(1) Install a magnetic rack and screen on the hopper to remove metallic and non-metallic impurities
(2) Regularly clean the hopper, conveying pipelines and barrel to prevent residues
(3) Keep the workshop environment clean, with raw material barrels covered and sealed
(4) Manage regrind by category, sieving before use to remove impurities
(5) Check screw and barrel wear to prevent metal powder generation
Key Takeaway
Impurity mixing is solved by strengthening raw material management and equipment cleanliness; complete impurity prevention measures need to be established.
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