Moire floor covering and method for its manufacture

US5824735A · kind A · utility

Assignee

• Firma Carl Freudenberg · DE

Inventors

• Gerhard Graab · Mannheim, DE
• Klaus Heckel · Weinheim, DE
• Alfons Butscher · Birkenau, DE
• Torsten Nahe · Mannheim, DE

Key dates

• Filing date: Mar 4, 1996
• Grant date: Oct 20, 1998
• Expiry date: Mar 4, 2016

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2995/0021
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A rubber moire floor covering is disclosed. The covering is produced by continuously feeding a screw-type short extruding machine having a length/diameter ratio of 6:1 with two or three varicolored strips of vulcanizable elastomeric material. The operating temperature is between 60.degree. C. to 100.degree. C. The elastomeric material leaves the extruder via a perforated disk having 200 to 600 cylindrical bore holes 3-5 mm in diameter. Each of the resulting strands is severed to produce segments that are 1 to 2 mm thick, the formed pieces are then cooled off on a section 4 meters to 6 meters long. Subsequently, the formed pieces are allowed to fall into the roll nip of a temperature controllable two-bowl calendar. The web of material leaving the calendar is fed to a continuous vulcanization installation and leaves it as finished floor covering. The material throughput rate in this continuous process may be varied from 700 kg/h up to 1300 kg/h.