B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 47/00 (2006.01) B29C 47/06 (2006.01) B29C 47/88 (2006.01) B29C 47/92 (2006.01) B29C 55/28 (2006.01) B29C 61/06 (2006.01) B32B 27/36 (2006.01) B32B 37/20 (2006.01) B65D 77/20 (2006.01) B29C 35/16 (2006.01) B29C 47/90 (2006.01)
Patent
CA 2499495
A method for producing a polybutylene terephthalate film by the air-cooling inflation method involving inflating a tube of a molten polybutylene terephthalate resin extruded from a ring die by means of the injection of air, characterized in that the resin is extruded under a resin pressure of 8.3 to 13.7 MPa and at a resin temperature of from the melting point of the above polybutylene terephthalate resin - 15~C to the above melting point - 5~C.
L'invention porte sur un procédé de production d'un film de térephtalate de polybutylène selon un système de gonflage à refroidissement par air qui consiste à gonfler un tube de résine de térephtalate de polybutylène fondu extrudée d'une filière annulaire par injection d'air. Ce procédé se caractérise en ce que la résine est extrudée sous une pression comprise entre 8,3 et 13,7 MPa et à une température allant du point de fusion de la résine de térephtalate de polybutylène de 15 ·C au point de fusion précité de5 ·C.
Borden Ladner Gervais Llp
Kagawa Seiji
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