Thermoforming
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PVC '2079851475616104458 Discoloration and Burning
Fenómeno do problema
PVC sheet '2079851475616104458 shows yellow/brown streaks, sour odor, products scrapped.
Análise das causas
De-HCl occurs when temperature exceeds 170~200℃; local hot spots of heaters, too long heating time; PVC '2079851475616104458 temperature red line is exactly the degradation temperature.
Solução
①Reduce oven temperature to safe window; ②Check whether ceramic heaters have local hot spots; ③Shorten heating cycle, avoid long-time heating; ④Strengthen workshop ventilation to exhaust decomposition gas; ⑤Use temperature measurement means to monitor actual sheet temperature.
Conclusão principal
PVC '2079851475616104458 'temperature red line = degradation temperature': local hot spots are invisible killers; PVC '2079851475616104458 must precisely control temperature within the window — hot spots and overtime both trigger de-HCl.
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