Device for the manufacture of deep-drawn objects using synthetic, thermoplastic foils

US3954374A · kind A · utility

Assignee

• Maschinenfabrik Rissen GmbH · DE

Inventors

• Fritz Wommelsdorf
• Werner Schmidt · Rengsdorf, DE

Key dates

• Filing date: Jul 17, 1974
• Grant date: May 4, 1976
• Expiry date: Jul 17, 1994

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29C51/261
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process and apparatus for forming objects of thermoplastic material by deep-drawing in which portions of a foil are cut to a size appropriate for each object, and are then freely supported while heating to the desired temperature. After heating the cut-out portions are tensioned about the edges thereof for the deep-drawing step. Modifications include multiple stations for heating and deep-drawing and means may be provided for deep-drawing the foil into a permeable container so as to line it with the deep-drawn thermoplastic material.