Injection unit for injection molding machines with...

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 45/54 (2006.01) B29C 45/53 (2006.01)

Patent

CA 2405622

The invention relates to an injection unit for injection molding machines, having an extruder as plasticizing unit, a plunger-type injection molding device (1) that can be coupled to the injection molding machine by means of an injection nozzle (6), wherein the plunger-type injection molding machine (1) has an injection plunger (2), wherein the area in front of the injection plunger (2) forms an injection area (5) and wherein the front end of the extruder is connected to the injection area (5) by means of a melt line (8). The invention is characterized in that a stop valve (9) is provided in the melt line (8) and in that a continuous extruder (10) having one or more plasticizing screws (13) is provided for plastification, wherein the extruder (10) is embodied in such a way that when the stop valve (9) is closed, the length of the back draft R L (11) can be increased backward into the extruder (10).

L'invention concerne une unité d'injection pour machines de moulage par injection, comportant une extrudeuse comme unité de plastification, un dispositif d'injection à piston (1) accouplable à la machine de moulage par injection par l'intermédiaire d'un injecteur (6). L'espace situé devant le piston d'injection (2) forme un espace d'injection (5) et l'extrémité avant de l'extrudeuse est reliée à l'espace d'injection (5) par l'intermédiaire d'une conduite de matière fondue (8). L'invention se caractérise en ce qu'il est prévu un clapet d'arrêt (9) dans la conduite de matière en fusion (8), une extrudeuse actionnée en continu, qui comporte une ou plusieurs vis sans fin de plastification (13) et destinée à la plastification, ladite extrudeuse (10) se présentant de sorte que lorsque le clapet d'arrêt (9) est fermé, la longueur de retenue RL (11) puisse être augmentée vers l'arrière dans l'extrudeuse (10).

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