Processing Machinery
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PVC Impact Modification Failure
Problem Phenomenon
Impact-modified PVC still fails the low-temperature impact requirement
Cause Analysis
The impact modifier is unevenly dispersed or the processing temperature destroys its structure; During on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based solely on experience; This mechanism has been repeatedly verified by industry materials, and it should be confirmed first during troubleshooting
Solution
Ensure modifier dispersion; processing temperature follows the supplier's guidelines; actual low-temperature impact test verification; After adjustment, take consecutive samples to verify the effect, and resume mass production only after confirming stability; Change only one variable at a time and record parameter changes, so as to locate effective measures
Key Takeaway
Impact modification requires dual assurance of dispersion and temperature; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; Include this case in the defect archive as a reference for troubleshooting similar problems in the future
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