A method of decreasing acetaldehyde level in a molded article

B - Operations – Transporting – 29 – B

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B29B 15/00 (2006.01) B29C 45/46 (2006.01) B29C 45/76 (2006.01)

Patent

CA 2712416

There is provided a method (200) for decreasing acetaldehyde level in a molded aerticle. The method (200) of decreasing acetaldehyde content in a molded article to be produced comprises introducing (202) into a feed throat (120) of an injection unit (100) a PET material to be plasticized, the PET material having been dried in a pre-treatment chamber (130); and introducing (204) into the feed throat (120) an un-treated agent (136) configured to increase moisture level of the PET material to be plasticized. In some embodiments of the present invention, the un-treated agent (136) is also configured to provide additional lubrication to the plasticizing screw (106).

L'invention porte sur un procédé (200) pour abaisser la teneur en acétaldéhyde dans un article moulé. Le procédé (200) d'abaissement de teneur en acétaldéhyde dans un article moulé devant être produit comprend l'introduction (202), dans une gorge d'alimentation (120) d'une unité d'injection (100), d'un matériau de poly(téréphtalate d'éthylène) devant être plastifié, le matériau de poly(téréphtalate d'éthylène) ayant été séché dans une chambre de prétraitement (130); et l'introduction (204), dans la gorge d'alimentation (120), d'un agent non traité (136) configuré pour élever le niveau d'humidité du matériau de poly(téréphtalate d'éthylène) devant être plastifié. Dans certains modes de réalisation de la présente invention, l'agent non traité (136) est également configuré de façon à produire une lubrification additionnelle de la vis de plastification (106).

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