Injection Molding
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EMA '2079851475616104452 Low Weld Line Strength
Problem Phenomenon
At the weld line of EMA injection molded multi-gate products, the strength 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 the front temperature higher; 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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