Aromatic polyester preform, blow moldings and process for...

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B29B 7/84 (2006.01) B29B 11/08 (2006.01) B29B 13/00 (2006.01) B29C 45/00 (2006.01) B29C 45/63 (2006.01) B29C 49/00 (2006.01) B29C 49/06 (2006.01) B29C 49/08 (2006.01)

Patent

CA 2284707

For the purpose of conducting injection molding of an aromatic polyester preform through advantageous exposure of a melt of the aromatic polyester to a reduced-pressure atmosphere, the production of an aromatic polyester preform is conducted by the use of a molding machine provided with vent holes at specified positions in order to evacuate the machine, whereby a preform lowered in acetaldehyde content can be advantageously produced.

En vue du moulage par injection d'une préforme en polyester aromatique par l'exposition avantageuse de polyester aromatique fondu à une atmosphère à pression réduite, on produit une préforme en polyester aromatique à l'aide d'une machine à mouler dotée d'évents situés à des positions spécifiques pour faire le vide dans la machine, ce qui permet de produire avantageusement une préforme à teneur réduite en acétaldéhyde.

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