B - Operations – Transporting – 65 – D
Patent
B - Operations, Transporting
65
D
B65D 1/40 (2006.01) B29C 49/12 (2006.01) B29C 49/18 (2006.01) B29C 49/64 (2006.01) B65D 1/02 (2006.01) B29C 49/06 (2006.01) B29C 61/02 (2006.01)
Patent
CA 2139741
A method of making a polyester container having an enhanced level of crystallinity in the sidewall (18) while maintaining a low level of crystallinity in a thickened base portion (26). The container is particularly useful as a refillable container which can withstand higher caustic wash temperatures and exhibits reduced flavor carryover, or as a hot-fill container. According to the method, a sidewall-forming section of a preform is initially expanded, heated to contract and crystallize the same, and then reexpanded; a baseforming portion of the preform is shielded from the heat treatment and is expanded either before or after the heat treatment step.
Procédé de fabrication d'un contenant en polyester, avec paroi latérale (18) à degré de cristallinité amélioré, et base épaissie (26) à faible degré de cristallinité. Le contenant est particulièrement utile pour la recharge, car il peut supporter des températures supérieures de lavage par un agent caustique et ne s'imprègne que faiblement du goût du contenu; il peut aussi contenir des charges à haute température. Selon la méthode, une section de préforme est d'abord expansée, et chauffée pour sa contraction et sa cristallisation, puis réexpansée; une partie de la préforme constituant la base est protégée du traitement thermique et est expansée avant ou après ce traitement.
Collette Wayne N.
Krishnakumar Suppayan M.
Lin Chi Ching
Continental Pet Technologies Inc.
Ogilvy Renault Llp/s.e.n.c.r.l.,s.r.l.
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