Process for the production of a three-dimensionally shaped sandwich structure
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United States of America Patent
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Jul 31, 2012
Grant Date -
Mar 19, 2009
app pub date -
Mar 7, 2007
filing date -
Mar 8, 2006
priority date (Note) -
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Abstract
The three-dimensionally shaped sandwich structure is produced starting from a layered material (1) comprising a compressible core layer, in particular a paper honeycomb structure, having two opposite main faces which are each covered with a reinforcing material and with a mouldable material. The layered material (1) is moulded in a compression mould comprising two mutually movable mould sections (7, 9). In order to reduce the formation of cracks, tears or breaks in the core layer, the first mould section (7) is composed of at least two mutually movable mould parts (10 and 11-12). A first portion of the layered material (1) is first deep-drawn by moving the first mould part (10) towards its moulding position so that wrinkles are formed in the layered material and the second mould part (11-12) is moved later and/or more slowly than the first mould part (10) towards its moulding position. In this way the formation of wrinkles by the first mould part (10) is enhanced due to the fact that the layered material (1) is little or not hampered from being drawn by the first mould part to the deep-drawn area. The second mould part may be composed of different subparts (11-13) which are also moved successively towards their moulding position.
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