Process for surface treatment of foamed sheets

US4364892A · kind A · utility

Inventors

• Helmut Rehlen · Bad Schussenried, DE
• Jurgen Roellinghoff · Ochsenhausen, DE

Key dates

• Filing date: Jul 20, 1979
• Grant date: Dec 21, 1982
• Expiry date: Jul 20, 1999

Classification

• Technology area (CPC Y): Emerging Cross-Sectional Technologies
• CPC primary: Y10T428/31
• WIPO field: Other special machines
• WIPO sector: Mechanical engineering

Abstract

A process for the continuous modification of the surface portion only of a foamed plastic web to impart high mechanical resistance with retention of air permeability and elasticity comprises preheating the web to a temperature below its melting point, passing the preheated web through the nip of a calendar and withdrawing the web from the calender under tension. The calendar comprises a pressure roller heated to a temperature above the melting point of the web and a backing roller which is not heated.