Injection Molding
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Color Fading/Color Difference of PE Injection Molded Products
Problembeschreibung
Colored PE parts have uneven color, batch-to-batch color difference, or fade during use.
Ursachenanalyse
Uneven dispersion of color masterbatch (insufficient back pressure), melt temperature fluctuation affecting color development, and changes in regrind proportion cause color difference; insufficient heat resistance/light fastness grade of the color masterbatch leads to fading.
Lösung
①Increase back pressure to improve dispersion; ②Stabilize melt temperature and regrind proportion; ③Select heat-resistant color masterbatch (not decomposing at processing temperature); ④Select light-resistant color masterbatch for outdoor parts; ⑤Pre-mix uniformly and check color against the first article.
Wichtigste Erkenntnis
For PE color difference, check 'dispersion + metering stability'; for fading, check 'heat resistance + light fastness': stabilize the variables of regrind proportion, melt temperature, and feeding metering, and more than half of the color difference sources are eliminated; outdoor parts must also use light-resistant color masterbatch, otherwise fading is inevitable.
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