Device for shaping plastic objects under inert atmosphere

US7147460B2 · kind B2 · utility

Assignee

• L'Air Liquide, Société Anonyme à Directoire et Conseil de Surveillance pour l'Étude et l'Exploitation des Procédés Georges Claude · FR

Inventors

• Olivier Negro · Paris, FR
• Sami Dick · Le Chesnay, FR
• Marc Leturmy · Houston, US
• Stephane Melen · Saint-Dié-des-Vosges, FR

Key dates

• Filing date: Sep 10, 2001
• Grant date: Dec 12, 2006
• Expiry date: Apr 2, 2022

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C48/295
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

The invention relates to a device for producing plastic articles by forming them in an inert atmosphere, the device comprising a hopper, a feed screw and means for forming the polymer melt. The device for injecting inert gas comprises a gas feed pipe, a gas injection surface near the wall of the hopper and a homogenization chamber fitted between the wall of the hopper and the gas feed pipe. That end of the gas feed pipe which is directed towards the injection surface is closed and has at least one radial opening O allowing the gas to be ejected at right angles to its direction of flow in the pipe.