Injection Molding
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Low weld line strength in EAA '2079851475616104452
Problem Phenomenon
The strength at the weld line of EAA injection molded multi-gate products 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; the dispersed phase orientation at the weld line is discontinuous
Solution
1) Raise the injection temperature by 10-15°C to increase diffusion depth; 2) Increase the injection speed to keep the melt front temperature higher; 3) Increase the 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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