B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 45/18 (2006.01) B29B 13/06 (2006.01) B29C 45/17 (2006.01) B29C 47/10 (2006.01)
Patent
CA 2526232
The invention relates to a method and device for the production of polyethylene terephthalate preforms. The inventive device comprises: a feed hopper (3) for polymer granules arriving from a dryer; means (1, 2) for heating, moving and pressurising the polymer, such as a heated screw conveyor; and polymer-shaping means. According to the invention, an inert gas is injected at a point (4, 5, etc.) which is located at the dryer, at the hopper or downstream of the hopper, said gas being pre-heated to a temperature of at least 170 ·C and, preferably, within a temperature range of between 170 ·C and 250 ·C.
Selon l'invention, on dispose : d'une trémie (3) d'alimentation en granulés de polymère en provenance d'un sécheur, de moyens (1, 2) de chauffage, de déplacement, et de mise en pression du polymère, tels une vis sans fin chauffante, de moyens de mise en forme du polymère, et où l'on procède à l'injection d'un gaz inerte en une localisation (4, 5, ..) située au niveau du sécheur, ou au niveau de la trémie, ou encore en aval de la trémie, le gaz ayant été préchauffé à une température d'au moins 170 ~C, préférentiellement dans la gamme de température allant de 170 ~C à 250 ~C.
Benjamin Yves
Rames-Langlade Geraldine
L'air Liquide Societe Anonyme Pour L'etude Et L'exploitation Des Proced Es Geo
L'air Liquide Societe Anonyme A. Directoire Et Conseil de Survei
Norton Rose Or S.e.n.c.r.l. S.r.l./llp
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