Process for manufacturing molded articles provided with cavities
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United States of America Patent
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Apr 5, 2005
Grant Date -
Oct 31, 2002
app pub date -
Jun 7, 2002
filing date -
Jul 29, 1997
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Process for manufacturing molded articles made of plastics, cellulose, pulp or wood fibers with cavities, in particular composite parts for light weight construction, by means of tool parts, including the following process steps: a) matrix layer is provided at pre-selected locations with inserts containing gas-creating substances or blowing agents and b) these inserts are activated to create gas in tool parts and thus expand the matrix material. Also disclosed are gas-creating insertion elements for use in the process and made of gas-creating blowing substances enclosed in gas-proof sheaths or inserted into the matrix material 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.
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