Processing Machinery
6 visualizações
PVC Sink Mark Holding Pressure
Fenómeno do problema
Sink marks in thick-wall areas were obvious; increasing holding pressure improved them but lengthened the cycle
Análise das causas
Insufficient shrinkage compensation in PVC thick-wall areas forms sink marks; poor heat conduction makes thick walls solidify slowly, requiring long holding pressure; thinning the wall thickness design is more fundamental than process compensation; during on-site troubleshooting, verify item by item according to this mechanism to avoid blindly adjusting the machine based only on experience
Solução
①Increase holding pressure and time; ②thin the structure of thick-wall areas or core out material; ③place the gate near thick-wall areas; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
Holding pressure is effective for PVC sink marks but treats the symptom; structural thinning is the root cure—use both in combination; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence
Isto foi útil?
0 pessoas acharam isto útil
Obrigado pelo seu comentário!