Method for producing foams made of polymers or polymer mixtures and moulded articles made from said foams

US6383424B1 · kind B1 · utility

Assignee

• Membrana GmbH · DE

Inventors

• Quan Huang · Schwelm, DE
• Dieter Paul · Neunkirchen, DE
• Bernd Seibig · Geesthacht, DE

Key dates

• Filing date: Aug 29, 2001
• Grant date: May 7, 2002
• Expiry date: Aug 29, 2021

Classification

• Technology area (CPC B): Performing Operations; Transporting
• CPC primary: B29K2105/0005
• WIPO field: Chemical engineering
• WIPO sector: Chemistry

Abstract

A method using a two part process line is proposed for manufacturing foams from polymers or polymer mixtures useful for making molded bodies. The process line is divided into at least one first part and one second part. The polymer or polymer mixture is melted in the first part and a gas at a pressure increased relative to the melt pressure is added with the influence of a shearing and/or kneading device on the melted polymer or polymer mixture enriched with gas. In the second part of the process line, foam is formed from the gas-enriched polymer or polymer mixture at a higher pressure than the pressure in the first part of the process line. Membranes can be made from the molded bodies made by the method described above.