Processing Machinery
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PCABS Sink Marks and Wall Thickness
Fenómeno do problema
[Problem Phenomenon] PC/ABS thick-walled rib backs have sink marks, and the appearance is unqualified
Análise das causas
In thick-walled areas, the outer layer solidifies first and internal shrinkage pulls in the surface; excessive rib wall thickness is the main structural cause; insufficient holding pressure aggravates it; during on-site troubleshooting, verify item by item according to this mechanism, and avoid blindly adjusting the machine based only on experience
Solução
Control rib thickness to 50-60% of the main wall; raise holding pressure to 50-70% of injection and extend time; reduce material or strengthen cooling in thick areas; after adjustment, continuously sample to verify the effect, and resume mass production after confirming stability
Conclusão principal
For PC/ABS sink marks, first check wall thickness and rib thickness, then supplement with holding pressure; after confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence; include this case in the defect archive as a troubleshooting reference for similar problems in the future
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