5 Metering principle
The dosing auger of the MC18-Micro combined with a very precise
adjustable stepping motor ensures that the additive output is
accurate and regular. For every particular application Movacolor
provides different neckpieces but the most common mounting of
the neckpiece is between the production machine and the hopper.
In the figure below a cut through of the NST40 neckpiece can be
seen.
During operation, the virgin material runs from the
machine hopper through the neckpiece (1) into the
machine. Inside the neckpiece the virgin material flow (4)
is divided into two streams by the cover plate(3). In the
space below the cover plate, the rotating cylinder (2) is
dosing additive.
Additive is added directly into the center of the virgin
material flow, just before it enters the production
machine (5). This is a great advantage over metering devices
that use batch pre-mixing because pre-mixing can
actually cause material separation. Separation of
materials results in an irregular additive flow into the
production machine.
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