Processing Machinery
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Product Defects Caused by Impurities Mixed into High-Density Polyethylene Raw Material
Problem Phenomenon
Black spots, foreign particles, or color difference areas appear on the surface or inside of the product.
Impurities not only affect the appearance, but also act as stress concentration points to 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 residual foreign matter
（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 the regrind processing
（5）Metal powder produced by equipment wear mixes into the raw material
Solution
（1）Install magnetic racks and filter screens on the hopper to remove metallic and non-metallic impurities
（2）Regularly clean the hopper, conveying pipelines, and barrel to prevent residue
（3）Keep the workshop environment clean, and cover and seal the raw material barrels
（4）Manage the regrind by classification, 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 cleaning, and complete anti-impurity measures need to be established.
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