Injection molding unit with a device for mixing and metering plastic melt and additives
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United States of America Patent
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Nov 29, 2005
Issued Date -
N/A
app pub date -
Jan 28, 2004
filing date -
Jul 28, 2001
priority date (Note) -
Expired
status (Latency Note)
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Abstract
An injection unit for an injection molding machine includes an injection device in the form of a plunger/screw, which is driven axially and rotationally in a housing, and a device intended for mixing and metering plastic melt and including an inlet for introduction of an additive. A spacer element is disposed between a backflow prevention assembly of the screw and the plunger, with the spacer element having a length, which corresponds at least to the stroke of the injection device. The spacer element has a first flow channel for establishing in each position a fluidic connection with a second flow channel which initially extends radially in an outward direction and then parallel to the movement and guide area of the plunger to an area between a nozzle and the plunger. The second flow channel extends through the mixing and metering device arranged adjacent to a movement and guide area of the plunger.
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