Method for operating an injection unit for an injection molding machine
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United States of America Patent
Stats
-
N/A
Issued Date -
Aug 1, 2002
app pub date -
Dec 20, 2001
filing date -
Dec 2, 2000
priority date (Note) -
Abandoned
status (Latency Note)
Importance
Abstract
A method is provided for operating an injection unit of an injection molding machine for metering or injecting material, also to create a back pressure in the melt, or to create a holding pressure on the melt, by means of a screw drive including two electric motors, with a controlled electrical connection to one another, and by means of a spindle-nut combination, such that the two electric motors can be operated in the same direction of rotation or in the opposite direction of rotation. In one embodiment, the two electric motors are operated counter-rotationally to inject the material, or the two electric motors are operated synchronously in their direction of rotation to create a back pressure in the melt or a holding pressure on the melt, a difference rpm being set by means of at least one electric feedback signal.
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