Patent · US Expired

Process for producing multi-layer mouldings

US5236657A · kind A · utility

7Cited by

4References

2Claims

0Family size

Assignee

BAYER HEALTHCARE LLC · DE

Inventors

Werner Waldenrath · Cologne, DE
Joachim Wank · Dormagen, DE
Wolfgang Lamaack · Grevenbroich, DE
Dietmar Benner · Lohmar, DE
Friedrich Johannaber · Lohmar, DE
Karl-Heinz Julicher · Cologne, DE

Key dates

Filing date	Jan 25, 1991
Grant date	Aug 17, 1993
Priority date	—
Expiry date	Jan 25, 2011

Classification

Technology area (CPC B)Performing Operations; Transporting
CPC primaryB29C2045/14213
WIPO fieldOther special machines
WIPO sectorMechanical engineering

Abstract

The production of multi-layer mouldings (17) from a sheet (6) injection-moulded behind with a resin can be simplified by the sheet (6) being deformed in an injection mould by means of a fluid pressure medium, in particular nitrogen, at at least 20 bar and the deformed sheet (6) injection-moulded behind with resin directly thereafter in this injection mould, a pressure keeping the deformed sheet (6) in position being maintained during the injection-moulding behind.

Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.