Material Analysis
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PVC Filling Modification
Problem Phenomenon
Filled PVC pipe fittings had good dimensional stability but decreased welding strength and poor surface gloss
Cause Analysis
Fillers such as calcium carbonate reduce cost and improve rigidity and dimensional stability; but excessive filling reduces toughness and welding strength and lowers surface gloss; filling amount must be balanced by application
Solution
①Moderately fill structural parts to control cost; ②limit filling amount for welded parts; ③reduce filling or select ultrafine filler for high-gloss appearance parts; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Key Takeaway
PVC filling is a balance between cost and performance; set the filling upper limit according to welding and appearance requirements; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
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