Conair TrueFeed User Manual page 23

DUAL REGULATION
The Dual TrueFeed system functions as two gravimetric feeders with the Regrind unit as the master and the
Color unit as the slave. It is only possible to use the Dual TrueFeed system on an injection molding machine.
See the schematic below.
Grinder
In the diagram below, the linear relation between Color feeding and the Regrind feeding is shown. The Regrind
metering unit determines the masterbatch feeding amount at the same time. To regulate the overall mix, the
Regrind metering unit needs know in advance how much regrind must be processed before the masterbatch
dose is adjusted. This is done via a master-slave control in which the Regrind metering unit is the master. The
metering unit(s) will try to achieve the optimum setpoint.
% of Masterbatch to add to make 100% color
in relation to % regrind to be added
(on the basis that regrind contains same color % as final product)
3,0%
3,0%
2,7%
2,4%
2,5%
2,1%
2,0%
1,5%
1,0%
0,5%
0,0%
DUAL TRUEFEED OPERATION
The Dual TrueFeed has the following two feeding modes:
Regrind mode
Color mode
Virgin
4
3
Regrind
2
1
0
Neckpiece
Injection molding machine
1,8%
1,5%
1,2%
0,9%
% of regrind
Color
0,6%
0,3%
0,0%
19 Dual Feed TrueFeed Manual