Injection Molding
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MP '2079851475616104452 low weld line strength
Problem Phenomenon
MP injection molded multi-gate products have weld line strength only 30-40% of the whole
Cause Analysis
the two melt fronts have cooled down, causing small molecular chain diffusion depth and insufficient entanglement; dispersed phase orientation discontinuous at the weld line
Solution
1) raise injection temperature 10-15°C to increase diffusion depth; 2) increase injection speed to keep the 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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