Apparatus for producing sheet material

US4164387A · kind A · utility

Assignee

• Sandvik Conveyor GmbH · DE

Inventors

• Konrad Schermutzki · Waiblingen, DE
• Gerhard Stabler · Welzheim, DE

Key dates

• Filing date: Jun 19, 1978
• Grant date: Aug 14, 1979
• Expiry date: Jun 19, 1998

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B27D3/04
• WIPO field: Machine tools
• WIPO sector: Mechanical engineering

Abstract

A method and apparatus for producing sheets of plastic having precisely controlled thickness. Two endless steel belts are positioned to provide coextensive runs between which there is a press-gap of uniform thickness. Each of the belts is provided throughout the treatment zone with a back-up pressure structure formed by a continuous array of rollers positioned along each of the belts and a back-up plate structure which is positioned to provide a precisely controlled gap for the rollers. The rollers are turned by the contact with the belt and roll along a path throughout the length of the treatment zone. Heated liquid is passed through the plates to control the temperature of the product being treated. Each of the plate structures is held against its array of rollers by a plurality of steel bearing strips, the transverse dimension of each of which is controlled by passing a heated liquid through it. The bearing strips, in turn, rest upon a press table which exerts pressure against the belt through the bearing strips, the heating plate and the array of rollers. The strips are thermally responsive so that their dimensions are increased by an increase in temperature, and extend longitu…