Material Analysis
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COC Raw Material Batch Viscosity Fluctuation
Problem Phenomenon
The filling state of different batches of COC raw material changes under the same process, short shots and flash appear alternately, and the process is forced to be adjusted frequently.
Cause Analysis
Differences in molecular weight distribution between raw material batches cause melt index fluctuations; COC viscosity is sensitive to molecular weight; supplier process fluctuations or blending differences are transmitted to the molding window.
Solution
①Inspect the melt index of incoming materials by batch and record the trend; ②fine-tune the temperature compensation according to the measured melt index; ③lock the molecular weight specification range with the supplier; ④establish a batch traceability and process linkage table for critical parts.
Key Takeaway
COC batch viscosity fluctuations must be intercepted in advance by incoming inspection; the melt index-process linkage table is a practical tool for stable production; supplier specification locking controls from the source.
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