User guide

TrueFeed manual

Fig. 3

1. Color 2. Virgin material 3. Throat adaptor 4. Dispensing cylinder

5. Cover plate 6. Mixing zone 7. To production machine

4. Metering principle

The Dispensing cylinder

of the TrueFeed is combined with a very precise adjustable stepper motor ensuring

that the additive output is accurate and consistent. The throat adapter (a

mixing chamber) is designed to blend

the main material and the additive homogeneously. Conair supplies a large range of machine throat adaptors

that make a perfect fit to your injection molding machine or extruder. The most common mounting of the throat

adaptor is between the production machine and the machine hopper. In the figure below, a cross section of the

NST40 throat adaptor can be seen.

Standard throat adaptor

During operation, the virgin material runs from the

machine hopper through the throat adaptor into the

machine. Inside the throat adaptor the virgin material

flow is divided into two streams by the cover plate. In

the space below the cover plate, the rotating cylinder

is feeding additive.

Additive is added directly into the center of the virgin

material flow, just before it enters the production

machine. This is a great advantage over metering

devices that use batch pre-mixing; because pre-

mixing can actually cause material separation.

Separation of material results in an irregular additive

flow into the production machine.

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