Method for the fabrication of crystallizable resins and...

B - Operations – Transporting – 29 – C

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B29C 49/64 (2006.01) B29B 11/06 (2006.01) B29C 49/08 (2006.01) B29C 55/02 (2006.01) B29C 55/12 (2006.01)

Patent

CA 2489421

Precrystallizing an amorphous crystallizable thermoplastic article, such as an amorphous polyethylene terephthalate article, by heating to thermally induce crystallinity, then orienting at a temperature that is preferably greater than the crystallizing temperature, provides articles having substantially improved thermal dimensional stability together with high tensile modulus properties. The process is particularly useful in the production of containers suitable for use in hot-fill applications.

La précristallisation d'un article thermoplastique cristallisable amorphe, tel qu'un article de polyéthylène téréphtalate amorphe, par induction thermique de la cristallinité au moyen d'un réchauffement, puis orientation à une température de préférence supérieure à la température de cristallisation, permet d'obtenir des articles présentant une stabilité dimensionnelle considérablement améliorée sous l'effet de la chaleur, ainsi que des propriétés appréciables de résistance à la traction. Ce procédé est particulièrement utile pour la fabrication de réservoirs utilisés en remplissage à chaud.

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