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1. (WO1999006200) PROCESS FOR MANUFACTURING MOULDED ARTICLES MADE OF PLASTICS, CELLULOSE OR WOOD PULP AND PROVIDED WITH CAVITIES

Pub. No.:    WO/1999/006200    International Application No.:    PCT/DE1998/002205
Publication Date: Fri Feb 12 00:59:59 CET 1999 International Filing Date: Thu Jul 30 01:59:59 CEST 1998
IPC: B29C 44/18
Applicants: ICKINGER, Georg, Michael
Inventors: ICKINGER, Georg, Michael
Title: PROCESS FOR MANUFACTURING MOULDED ARTICLES MADE OF PLASTICS, CELLULOSE OR WOOD PULP AND PROVIDED WITH CAVITIES
Abstract:
A process for manufacturing moulded articles made of plastics, cellulose or wood pulp and provided with cavities (9), in particular composite parts for light-weight construction, by means of tool parts (1, 2), has the following steps: (a) a matrix material (5) is provided at preselected locations with inserts (7) which contain gas-developing blowing agents; and (b) the inserts (7) are caused to develop gas in the tool parts (1, 2) and expand the matrix material (5). Also disclosed are the gas-developing inserts for use in said process and made of gas-developing blowing substances enclosed in gas-tight sheaths or inserted into the matrix material (5) so as to form locally delimited regions therein. This process allows particularly light and at the same time solid tool parts to be produced, in particular composite parts for light-weight construction.