Processing Machinery
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PVC Heat Stabilizer System
Problem Phenomenon
With the same equipment and same process, PVC materials from different suppliers show obvious differences in degradation temperature and quality fluctuation
Cause Analysis
PVC must rely on heat stabilizers to be processed: tin-type and calcium-zinc-type stabilizers capture HCl to delay degradation; formulation quality determines the degradation starting point, and inferior material decomposes at lower temperatures
Solution
①Select stabilized PVC granules from well-known suppliers; ②compare heat stability of different batches; ③re-verify stabilizer effectiveness of self-compounded materials after long-term production suspension; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
The processability of PVC is given by the formulation; the stabilizer system is a core indicator of raw material acceptance, not an option; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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