Injection Molding
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Color Fading/Color Difference of PE Injection Molded Products
Problem Phenomenon
Colored PE parts have uneven color, batch-to-batch color difference, or fade during use.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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