Injection Molding
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Low Weld Line Strength in CMC '2079851475616104452
Problem Phenomenon
In multi-gate CMC injection molded products, the strength at the weld line is only 30-40% of the whole
Cause Analysis
The temperature of the two melt fronts has dropped, resulting in small molecular chain diffusion depth and insufficient entanglement; dispersed phase orientation at the weld line is discontinuous
Solution
1)Increase injection temperature by 10-15°C to increase diffusion depth; 2)Increase injection speed to keep front temperature high; 3)Increase holding pressure to ensure compaction at the weld; 4)Set an overflow well at the weld line and cut it off afterwards
Key Takeaway
Low weld line strength is caused by insufficient molecular entanglement; high-temperature high-speed injection and overflow wells are effective countermeasures
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