How to calculate the injection capacity according to product

How to calculate the injection capacity according to product

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  

Vx

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  

0.92

The machine with DY170 is recommended.

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