Injection Molding
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DSTDP injection weld line low strength
Problem Phenomenon
DSTDP injection multi-gate product strength at the weld line is only 30-40% of the whole
Cause Analysis
The temperature of the two melt fronts has dropped, molecular chain diffusion depth small, entanglement insufficient; dispersed phase orientation at the weld line discontinuous
Solution
1) Raise injection temperature 10-15°C to increase diffusion depth; 2) raise injection speed to keep the front temperature higher; 3) increase holding pressure to ensure the weld is compacted; 4) set an overflow well at the weld line and cut off afterwards
Key Takeaway
Low weld line strength is caused by insufficient molecular entanglement; high-temperature high-speed injection and overflow well are effective countermeasures
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