B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/60 (2006.01) B29C 47/84 (2006.01)
Patent
CA 2258297
The invention relates to an extruder screw with an interior temperature control channel leading to the front end of said extruder screw, for carrying free-flowing temperature control media to and from the extruder screw. Said extruder screw also has a screw tip which shuts off the temperature control channel, said temperature control channel being open towards the front. This screw tip is screwed to the front end of the extruder screw, at least one seal being positioned between the two. The aim of the invention is to increase the effectiveness of the seal positioned between the screw part and the screw tip, without complex and expensive measures for precision fitting. To this end, the temperature control channel (12) which is open towards the front, at the front end of the extruder screw (11) is shut off by means of a closing screw (13), an axial seal (16) being positioned in-between. Said closing screw (13) has shaped recesses for engaging the screwing tools in such a way that they interlock, and has an outer thread (18) onto which the screw tip (17) is screwed.
L'invention concerne une vis sans fin pour extrudeuse, comportant un canal thermostatique intérieur menant à l'extrémité frontale de ladite vis pour l'apport et l'évacuation d'un milieu thermostatique coulant. Cette vis présente également une pointe qui obture le canal thermostatique ouvert vers l'avant et qui est vissée à l'extrémité frontale de la vis, au moins un joint étant disposé entre les deux. L'invention vise à accroître l'efficacité du joint positionné entre la partie vis et la pointe de celle-ci, avec une complexité minimale pour l'ajustage de précision. A cet effet, le canal thermostatique (12) ouvert vers l'avant à l'extrémité antérieure de la vis d'extrudeuse (11) est obturé au moyen d'une vis d'obturation (13), un joint axial (16) étant intercalé entre les deux. Cette vis d'obturation (13) présente des évidements profilés destinés à la venue en prise, par liaison de forme, d'outils de vissage, ainsi qu'un filetage extérieur (18) sur lequel se visse la pointe de vis (17).
Grimm Robert
Nikolaus Stefan
Fetherstonhaugh & Co.
Krauss-Maffei Ag
Krauss-Maffei Kunststofftechnik Gmbh
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