Structure and Function
A: PL120000.055
B: PL120000.055
E: 06.93 / T. Weiß
G: 06.93 / T. Weiß
Chapter: 5.5
Page: 1
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5.5 Pneumatic unit
5.5.1Material feeder device UNIFEED (optional)
1) Area of application
The material feeder device was conceived for use with a
plastics processing machine; it is installed directly above the
screw cylinder (instead of the hopper).
This device is characterized by high operational reliability
since it does not contain any movable components; furthermore,
it is easy to operate and to maintain.
The following granulate materials are recommended for use
with UNIFEED:
PE-HD, PE-LD, PS, PA, PA+GF, PP, ABS, POM, PPO.
2) Setup and function
If during the metering process the level of the granulated
material sinks below the proximity limit switch (Item 1), this
switch activates an air valve (Item 2), and compressed air
flows into the material feeder device. The compressed air is
blown through the air jet (Item 3) into the suction pipes (Item
4) and thus creates a negative pressure which is transmitted
into the suction chamber (Item 5) and the container pipe (Item
6). This negative pressure then sucks a mixture of granulated
material and air mixture through the suction lance (Item 7) and
the suction tube (Item 8) into the container pipe.
A primary filter (Item 9) separates the granulated material
from the accompanying air. This air leaves the device through
a secondary filter (Item 10), retaining the fine dust which might
escape the primary filter.
When the level of the granulated material once more has
attained the proximity limit switch, the switch disconnects the
inflow of compressed air, and the feed process is terminated.
Whenever a feed process is terminated, a small quantity of
compressed air is transported, pulse-type, into the suction
chamber. Thus all adhering material dust is automatically
removed from the primary filter.
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