Device for filtering thermoplastic plastic material

Details Device for filtering thermoplastic plastic material Device for filtering thermoplastic plastic material

B - Operations, Transporting

29

C

B29C 47/68 (2006.01)

Patent

CA 2360285

An apparatus for filtering thermoplastic synthetic plastic material has a screw bearingly supported within a housing for rotation around its longitudinal axis for the transport and preferably also plasticizing of the synthethic plastic material. This material is supplied to the screw through an intake opening into the housing and leaves the housing through an exit opening. The screw is subdivided into two sections disposed one behind the other in axial direction. A filter provided with penetration openings is disposed in the flow of the synthetic plastic material that is disposed between these two sections, which filter is disposed within the housing between the two sections of the screw so that it subdivides the interior of the housing. The filter is connected for common rotation with at least one of the screw sections. At least one scraper mounted in the housing engages the upstream side of the filter and strips off coarse impurities from the filter when the filter is rotated and conveys the impurities into a collecting space that is in connection with the interior of the housing.

L'invention concerne un dispositif pour filtrer une matière thermoplastique, présentant une vis sans fin (5) qui est montée dans un boîtier (1) de manière à pouvoir tourner autour de son axe longitudinal et qui sert au transport et à la plastification de la matière thermoplastique. Cette matière est acheminée à la vis sans fin (5) dans le boîtier (1) par l'intermédiaire d'un orifice d'introduction (7) et sort du boîtier (1) par un orifice de sortie (8). La vis sans fin (5) est divisée en deux parties (9, 10) situées l'une derrière l'autre dans le sens axial. Un filtre (40) pourvu d'orifices de passage (25) et placé entre les deux parties (9, 10) de la vis (5) est situé sur trajet de la matière plastique, entre ces deux parties (9, 10), de sorte qu'il divise l'intérieur du boîtier. Ce filtre (40) est relié par liaison rotative à au moins une des parties (9, 10) de la vis sans fin. Au moins un outil de raclage (26) maintenu dans le boîtier (1) prend appui sur le côté du filtre (40), par lequel arrive la matière, et enlève par raclage les impuretés grossières du filtre (40), lors de la rotation de ce dernier, pour les acheminer dans une chambre collectrice (27) communiquant avec l'intérieur du boîtier.

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