Method for producing bottle-shaped container mainly made of...

B - Operations – Transporting – 29 – C

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B29C 49/18 (2006.01) B29C 49/64 (2006.01) B29C 49/06 (2006.01) B29C 49/22 (2006.01) B29C 49/66 (2006.01)

Patent

CA 2455873

A method for producing a bottle-shaped container that is highly thermally resistant and shows an excellent shaping/shape-keeping property in a short period of time is provided. The method for producing the bottle-shaped container mainly made of polyethylene terephthalate comprises the steps of: first biaxially- oriented blow-molding a preform mainly made of polyethylene terephthalate in a first metal mold, to form a primary intermediate molded article; causing thermal contraction of the primary intermediate molded aritcle by heating the primary intermediate molded article, to form a secondary intermediate molded article; and second blow-molding the secondary intermediate molded article in a second metal mold, to form the bottle-shaped container, characterized in that in the second biaxially-oriented blow-molding step, fluid is blown into the secondary intermediate molded article to expand the secondary intermediate article, and then further fluid is blown into and circulated in the expanded article to cool the expanded article.

Cette invention concerne un procédé permettant de fabriquer un récipient ou une bouteille qui résistent à la chaleur, présentent une remarquable capacité de formage et sont réalisés essentiellement en résine de poly(éthylène téréphtalate). Ce procédé consiste, au moyen d'un moule métallique primaire, à réaliser par soufflage avec étirement bi-axial primaire une préforme constituée principalement de résine de poly(éthylène téréphtalate), ce qui donne un produit intermédiaire primaire. On chauffe ce produit intermédiaire primaire pour obtenir un second produit intermédiaire formé obtenu par contraction thermique du premier produit intermédiaire. Le second produit intermédiaire est formé par soufflage secondaire au moyen d'un moule métallique secondaire et, au cours de ce second processus de soufflage, le liquide est soufflé dans le produit formé où il circule pour refroidir ledit produit formé.

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