Material Analysis
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PMMA Weld Line Low Strength
Fenómeno del problema
Weld lines on products are clearly visible and strength drops by 20~40%; weld lines on transparent parts also affect optical appearance.
Análisis de la causa
The flow fronts of the two melt streams have low temperature and insufficient molecular chain diffusion at the interface; PMMA melt viscosity is high and the flow front cools quickly, making weld line problems more prominent than in general materials.
Solución
①Increase injection speed to maintain flow front temperature; ②optimize gate position to avoid critical areas; ③raise mold temperature to promote molecular diffusion; ④set venting and overflow wells at the confluence.
Conclusión clave
PMMA weld lines have dual effects on both strength and appearance; coordinated optimization of speed, temperature and gate layout can transfer weld lines to non-critical areas.; After confirming effectiveness, fix the parameters and practices into the work instruction to prevent recurrence.
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