a.
To
start
The necessary power to start includes :
-
The power
for the setting of temperature of the mould and of the upper and
lower plates. This power is particularly important given that
temperature rises quickly.
-
The power to
balance losses by conduction, convection and radiation. During the
starting period, it is equal to 2/3 of the total losses of the permanent
regime.
P = (F1 + 2/3
F3) 1,1
Where :
F1 = heat for the
setting of temperature
F3= total of heat losses
1,1= coefficient of safety
P= (3711 + 2/3 x 2686) 1,1
Power to start = 6052 W
The working power is equal to :
-
The power to
heat plastic.
-
The power to
balance heat losses.
P
= (F2 +
F3) 1,1
Where :
F2 = power to heat plastic
F3 = power to balance heat
losses
1,1 = coefficient of security
P = (94 + 2686) 1,1
