Processing Machinery
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Impurities mixed into general-purpose polyethylene raw material causing product defects
Problembeschreibung
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 serve as stress concentration points to reduce mechanical properties, and in severe cases cause the product to crack at the impurities.
Ursachenanalyse
（1）Impurities are mixed in during the packaging or transportation of the raw material
（2）The hopper or conveying pipeline is not clean, and foreign matter remains
（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 generated by equipment wear is mixed into the raw material
Lösung
（1）Install a magnetic frame and filter screen on the hopper to remove metal and non-metal 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 classification, and sieve to remove impurities before use
（5）Check the wear of the screw and barrel to prevent the generation of metal powder
Wichtigste Erkenntnis
Impurity mixing is solved by strengthening raw material management and equipment cleaning, and sound anti-impurity measures need to be established.
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