2.5 Shot Weight Calculation for Machine.

The maximum shot weight depends on :
- material being used.
- volume of barrel (cm3).

Different material - different gravity under temperature.

How to calculate max. shot weight :

2.4 Cycle Time Calculation for the mold Process.

 Cycle time calculation.

t close
t E              :        injection time
t N             :        hold on pressure time
t K             :        cooling time
tv. pl.         :        delayed start of plasticising
t pl.            :        plasticising time

2.3 Calculation of Mold Heating.

As you can see in the lis of mold temperatures, due to different materials, you need to set different mold temperatures.

How to calculate the right mold heating unit :

P = heat capacity (kw)
m = weght of mold (kg)
c = specific heat (kJ/kgK)
      steel C =  0.49
     Alumunium = 0.88

2.2.3 Cooling Time Diagram.

Now use the cooling time diagram :

2.2.2 Calculation of Mold Cooling Time for the Mold.

Use diagram cooling time calculation.

2.2.1 Enthalphy Curves For Various Thermoplastics

Enthalpy curve for various thermoplastics diagram.

How to use :

Read out on the corect material curve the enthalpy in Kcal/kg and multiply this with the used material quantity in kg/h, you get the :

(Kcal/ kg)/(kg/h)  =  Kcal/h

2.1.2 Maximum Flow path - Wall thickness of the Mold.

Ratio with different wall thickness :