Molds & Tooling
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COC Recycled Material Optical Downgrade
Problem Phenomenon
After recycled runner material is mixed into COC transparent parts, haze rises and slight hue changes appear, the optical indicators approach the lower specification limit, and the risk of customer sampling increases.
Cause Analysis
After the recycled material undergoes heat history, trace degradation products accumulate, the light transmittance decreases and the hue shifts; the risk of dust and foreign matter mixing in during the grinding process increases; optical parts are sensitive to slight deterioration.
Solution
①Restrict or prohibit the use of recycled material in optical parts; ②when used, strictly limit the proportion and verify the optical indicators; ③manage recycled material separately to prevent cross contamination; ④downgrade it to non-optical parts.
Key Takeaway
The use of COC recycled material in optical parts must be extremely conservative; a slight loss of light transmittance may break through the customer specification; downgraded utilization is a safe route.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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