Sealable chamber extrusion apparatus and method with process...

B - Operations – Transporting – 29 – C

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B29C 44/20 (2006.01) B29C 44/50 (2006.01) B29C 44/60 (2006.01) B29C 47/36 (2006.01) B29C 47/78 (2006.01) B29C 47/88 (2006.01) B29C 47/90 (2006.01)

Patent

CA 2315215

An extrusion system utilizes single (30) or tandem extruders (102 and 103) and a mixer-cooler (104) to extrude a foamable extrudate through a die (37) in a sealable chamber. The foamable extrudate is shaped and calibrated within the chamber (40). The product exits the chamber to atmosphere on a continuous basis through a submerged orifice in a water baffle immersion seal. The seal includes the submerged orifice with a free wheeling guiding system upstream of the orifice. Immediately ahead of the guiding system, the parameters of the foam extrudate are sensed to control the configuration of the orifice on a continuous basis. Before the extrudate passes into the water baffle seal it moves over a floating dancer roll (65), the position of which controls a haul- off such as a vacuum belt, at the tail end of the system. This avoids pushing on the extrudate.

L'invention concerne un système d'extrusion à extrudeur simple (30) ou extrudeurs en tandem (102 et 103), et à mélangeur-refroidisseur (104), qui permet d'extruder un produit d'extrusion expansible à travers une filière (37) dans une enceinte close. Ledit produit, mis en forme et calibré à l'intérieur de la chambre (40), sort de cette chambre en continu pour venir au contact de l'atmosphère, via un orifice immergé dans un joint hydraulique d'immersion à chicane. Le joint considéré comprend l'orifice immergé et, en amont de cet orifice, un système de guidage en roue libre. Immédiatement avant le système de guidage, les paramètres du produit d'extrusion expansible sont détectés, de manière à pouvoir contrôler en permanence la configuration de l'orifice. Avant de pénétrer dans le joint hydraulique à chicane, ledit produit passe sur un rouleau fou flottant (65), dont la position contrôle un dispositif de tirage (par exemple, courroie sous vide), en queue de système, ce qui évite d'exercer une poussée sur l'extrudat.

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