How to calculate the injection capacity according to product
If the product is made from polystyrene, the injection capacity Wps shall be
Wps=(product weight + total weight of the runner system) / (0.75～0.90)
i.e. Wps=(1.3～1.1) × (product weight + total weight of the runner system)
The larger coefficient is taken when high precision product quality is required.
If the product is made from other plastic (named X plastic), calculate the theoretic injection capacity of the plastic, Wx, based on the aforesaid formula:
Wx=(1.3～1.1) × (product weight + total weight of the runner system)
But you can’t decide the injection capacity of the injection-molding machine simple by Wx, you have to exchange it into Wps. The formula is:
Wps=Wx × 1.05
In which, Vx represents the specific gravity of certain plastic.
For example: Suppose a plastic product is made from polyethylene (PE), its weight is calculated to be 185g, and the weight of runner system is estimated to be 20g, according to the aforesaid formula:
Wx = 1.2* (185+20) =246g
The specific gravity of PE Vx =0.92
So , Wps =246 × 1.05
The machine with DY170 is recommended.
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