B - Operations – Transporting – 29 – C
Patent
B - Operations, Transporting
29
C
B29C 44/18 (2006.01) B29C 33/76 (2006.01) B32B 5/24 (2006.01)
Patent
CA 2297934
Process for manufacturing molded articles made of plastics, cellulose, pulp or wood fibers with cavities (9), in particular composite parts for light-weight construction, by means of tool parts (1,2), including the following process steps: a) a matrix layer (5) is provided at pre-selected locations with inserts (7) containing gas-creating substances or blowing agents and b) these inserts (7) are activated to create gas in tool parts (1,2) and thus expand the matrix material. Also disclosed are gas-creating insertion elements for use in said process and made of gas-creating blowing substances enclosed in gas-proof sheaths or inserted into the matrix material (5) in order to form locally limited areas. This process allows the production of particularly light and at the same time solid tool parts, in particular composite parts for light-weight construction.
L'invention concerne un procédé de production de pièces moulées munies de cavités (9), réalisées en matière plastique, en cellulose ou en pâte mécanique, notamment de pièces composites légères, à l'aide de parties d'outil (1, 2), qui comprend les étapes suivantes: a) un matériau matriciel (5) est muni en des points présélectionnés d'éléments d'insertion (7) contenant des substances moussantes produisant du gaz et b) les éléments d'insertion (7) qui sont stimulés dans les parties d'outil (1, 2) afin de produire du gaz, élargissent le matériau matriciel (5). L'invention concerne en outre des éléments d'insertion produisant du gaz, qui s'utilisent dans ledit procédé et consistent en substances moussantes produisant du gaz, entourées d'enveloppes étanches aux gaz ou introduites dans le matériau matriciel (5) sous forme de zone limitée localement. Ce procédé permet de produire des pièces d'outil particulièrement légères et simultanément solides, notamment des pièces composites légères.
Gowling Lafleur Henderson Llp
Ickinger Georg Michael
Sulzer Chemtech Ag
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