Common Fault Analysis and Countermeasure of Hot Runner Mold Injection (1)

Common Fault Analysis and Countermeasure of Hot Runner Mold Injection (1)

 Remnants of the gate prominent or salivation dropping and poor surface appearance

Main reason: 

- Gate structure choice unreasonable,Improper temperature control,After injection, there is a large residual pressure

 in the melt

Solutions: 

-  Improvement of gate structure.

Typically, the length of the gate is too long, leaving a longer gate material on the surface.While the gate diameter is too large, it is easy to lead to salivation dropping phenomenon. When the above-mentioned fault occurs, it is important to consider changing the gate structure. Common form of hot runner gates are straight gate, point gate and valve gate.

-  Temperature and reasonable control. 
If the gate area cooling water is not enough, it will cause heat concentration, resulting in drooling, dropping and drawing phenomenon, so the phenomenon should be strengthened in the area of cooling.

-  Resin release pressure

Residual pressure within the flow channel is caused by excessive salivation is one of the main. Under normal circumstances, the injection machine should take a buffer circuit or buffer device to prevent salivation.


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