B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/52 (2006.01) B29C 47/14 (2006.01) B29C 47/40 (2006.01)
Patent
CA 2289634
The process for the production of expanded polyester, in particular PET, is performed by extrusion of polyester starting material having an intrinsic viscosity of at least 0.8 dl/g and an added expanded agent. To this end a twin screw extruder (14) is utilised provided with two interpenetrating screws (26) having a ratio between their axial separation and diameter lying between 0.6 and 0.8 and co-rotating at a speed of between 15 and 40 rpm. Preferably the ratio between the axial separation and diameter of the screws (26) lies between 0.69 and 0.78 and the ratio between the length and diamter of the screws (26) lies between 20 and 26.
L'invention concerne un procédé de production de polyester expansé, notamment de PET, mis en oeuvre par extrusion de matière première en polyester présentant une viscosité intrinsèque d'au moins 0,8 dl/g et un agent expansé ajouté. On utilise, pour ce faire, une extrudeuse (14) à deux vis pourvue de deux vis (26) qui s'interpénètrent, dont le rapport entre leur séparation axiale et leur diamètre est compris entre 0,6 et 0,8. Les deux vis tournent simultanément à une vitesse comprise entre 15 et 40 tours/min. Le rapport entre la séparation axiale et le diamètre des vis (26) est de préférence compris entre 0,69 et 0,78 et le rapport entre la longueur et le diamètre des vis (26) est compris entre 20 et 26.
B.c. Foam S.r.l.
Macrae & Co.
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