Processing Machinery
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Impurities mixed into low density polyethylene raw material causing product defects
Problembeschreibung
Black specks, 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, reducing mechanical properties; in severe cases, causing the product to crack at the impurities.
Ursachenanalyse
(1) Impurities mixed in during raw material packaging or transportation
(2) Unclean hopper or conveying pipelines, residual foreign matter
(3) Workshop environmental pollution; dust and foreign matter fall into raw material
(4) Other materials or impurities mixed in during regrind processing
(5) Metal powder from equipment wear mixed into raw material
Lösung
(1) Install magnetic grate and filter screen on the hopper to remove metallic and non-metallic impurities
(2) Regularly clean hopper, conveying pipelines, and barrel to prevent residue
(3) Keep the workshop environment clean, cover and seal raw material barrels
(4) Classify and manage regrind; sieve before use to remove impurities
(5) Check screw and barrel wear, prevent metal powder generation
Wichtigste Erkenntnis
Impurity contamination is solved by strengthening raw material management and equipment cleaning; complete anti-impurity measures need to be established.
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