Material Analysis
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PMMA Weld Line Low Strength
Problem Phenomenon
Weld lines on products are clearly visible and strength drops by 20~40%; weld lines on transparent parts also affect optical appearance.
Cause Analysis
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.
Solution
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.
Key Takeaway
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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