Apparatus and process for filtering viscous material

B - Operations – Transporting – 29 – C

Patent

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Details

B29C 47/68 (2006.01)

Patent

CA 2421614

An apparatus for filtering viscous material, in particular thermoplastic synthetic plastic material, comprises a screw (24), which presses the material to be cleaned from an upstream conduit (3) of a supply housing (2) towards a band-shaped screen (4). The screen (4) is abutted on its downstream side by a perforated plate (6) against the pressure of the supplied material. The band-shaped screen (4) can be displaced for replacement of a soiled band section by a fresh band section. For facilitating this displacement a device is provided, which comprises a closure means (30) that is disposed on the upstream side of the screen (4), by which closure means the upstream conduit (3) for the material to be filtered can be closed at least substantially. On the upstream side of this closure means (30) a storage space (36) for material to be cleaned is connected to the upstream conduit (3). Within this storage space (36) a piston (38) is sealingly guided, which is reciprocable by a drive means and closes in its projected position the storage space (36) against the upstream conduit (3).

L'invention concerne un dispositif pour filtrer une matière visqueuse, en particulier une matière thermoplastique. Ce dispositif présente une vis (24), qui presse la matière à nettoyer depuis un canal d'amenée (3), formé dans un logement d'admission (2), contre un filtre (4) en forme de bande. Ce filtre (4) est maintenu en aval par un plateau perforé (6) contre la pression de la matière affluente. Ce filtre en forme de bande (4) peut être déplacé de manière à permettre le remplacement d'une section de bande présentant des impuretés par une nouvelle section de bande. Afin de faciliter ce déplacement, un système présente un dispositif de fermeture, agencé en amont du filtre (4) et par lequel le canal d'amenée (3) de matière à filtrer peut être bloqué au moins en grande partie. En amont de ce dispositif de fermeture (30), une zone de stockage (36) de la matière à nettoyer est reliée au canal d'amenée (3). Un piston (38), engagé de manière étanche dans cette zone de stockage (36), effectue un mouvement de va-et-vient par l'intermédiaire d'un entraînement et, en position avancée, isole la zone de stockage (36) du canal d'amenée (3).

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