Processing Machinery
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PP Random Copolymer Transparent Processing
Problem Phenomenon
[Problem Phenomenon] Random copolymer PP transparent parts are hazy; optics not up to standard
Cause Analysis
Random copolymer PP has good transparency but is sensitive to crystallization and shear; nucleating agents improve transparency; the process controls crystallinity to ensure optics; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based on experience alone
Solution
Use random copolymer plus nucleating agent for transparent parts; mold temperature controls crystallization; low shear prevents haze; after adjustment, take continuous samples to verify the effect, and resume mass production only after confirming stability; change only one variable at a time and record parameter changes to facilitate locating effective measures
Key Takeaway
PP random copolymer plus nucleating agent; transparency relies on crystallization control; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar future problems
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