Extrusion & Post
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PVC Lubrication System Balance
Fenómeno do problema
In PVC processing, insufficient internal lubrication causes adhesion to the screw, and excessive external lubrication causes exudation and blooming on products
Análise das causas
PVC formulation needs internal-external lubrication balance: internal lubrication promotes melt flow, external lubrication prevents adhesion to metal; imbalance manifests as screw sticking or surface exudation; the lubrication system also affects later welding and printing
Solução
①For adhesion problems add external lubrication, for poor flow add internal lubrication; ②reduce external lubrication for exudation and blooming; ③verify lubrication adjustments with small-step trials; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
The PVC lubrication system is a fine balance of the formulation; internal and external differ, and excess and deficiency each have characteristic symptoms; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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