Processing Machinery
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Product Defects Caused by Impurities Mixed into Polypropylene Raw Material
Problem Phenomenon
Black specks, foreign particles, or color difference areas appear on the surface or inside the product.
Impurities not only affect appearance but also serve 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 pipeline is not clean, with foreign matter remaining
(3) The workshop environment is polluted, and 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 is mixed into the raw material
Solution
(1) Install a magnetic frame and filter screen on the hopper to remove metallic and non-metallic impurities
(2) Regularly clean the hopper, conveying pipeline, and barrel to prevent residues
(3) Keep the workshop environment clean, and cover and seal the raw material barrels
(4) Manage the regrind by category, and sieve it before use to remove impurities
(5) Check the wear of the screw and barrel to prevent the generation of metal powder
Key Takeaway
Impurity mixing is solved by strengthening raw material management and equipment cleanliness, and sound anti-impurity measures need to be established.
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