Parameters Of Injection Time

The injection time mentioned here refers to the time required for the plastic melt to fill the cavity, excluding the auxiliary time such as mold opening and closing. Although the injection time is very short and the effect on the molding cycle is very small, the adjustment of the injection time has a great role in the pressure control of the gate, runner and cavity. Reasonable injection time is conducive to the ideal filling of melt, and it is very important to improve the surface quality of the product and reduce the dimensional tolerance.
The injection time is much lower than the cooling time, about 1/10 to 1/15 of the cooling time, and this law can be used as the basis for predicting the molding time of all plastic parts. In the mold flow analysis, only when the melt is completely driven by the screw rotation to fill the cavity, the injection time in the analysis result is equal to the injection time set in the process conditions. If the pressure holding switch of the screw occurs before the cavity is filled, the analysis result will be greater than the set process conditions.