Usually changing colors in dosing unit requires manpower, because the unit must be manually emptied. In fact, emptying some feeders requires the removal of the entire feeder. The entry point of a raw materials is the throat of the machine. Generally, it is not readily accessible, especially in mid to large size injection molding machines and extruders. That way, the operator has to climb up to the machine in order to change the color in the dosing unit, a risk action that can end in fall and injury.
Venturi loading, a method based on air pressure principles, is very common for filling color dosing systems. We at LIAD have come up with Venturi emptying technique, specially created for ColorSave 1000gravimetric dosing units.
Venturi Emptying Mechanism is a state-of-art invention for changing colors in dosing unit, located at the base of the feeder. This mechanism, similarly to the Venturi Loading Mechanism, operates with an air pressure principle. With Venturi Emptying, there is no more need for physical access of an operator to the feeder. The process is controlled through the touch screen and extracts the colorant automatically.
The emptying mechanism includes a piston that opens during the emptying process. At the same time, the air pressure draws out the colorant. When the Venturi emptying mechanism is activated, the feeder’s screw turns backwards to release grains of colorant from the screw area, improving the cleaning process. An air nozzle connected to the throat opposite the feeder releases a jet air directed towards the feeder’s screw for more efficient cleaning. Residual colorant is emptied into a container located near the operator, so the change of color is done on the operator’s level.
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