Process and apparatus for dry forming of a material web from a long-fiber material
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United States of America Patent
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Dec 14, 1993
Grant Date -
N/A
app pub date -
Sep 9, 1992
filing date -
Sep 18, 1991
priority date (Note) -
Expired
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Abstract
The invention relates to a process and an apparatus for the dry forming of a material web from a long-fiber material, wherein fibrous material is blown into a forming space to form a porous material web on a wire passing through the forming space. The dry forming of long fibers in lengths of at least 20 mm is problematic. In accordance with the invention, this problem has been solved in such a way that the fibrous material is blown into the forming space by at least one air current (A) that is substantially horizontal and transverse to the wire, the fibrous material is guided onto the surface of the wire (1) by an air current (D) that is substantially vertical and passes through the wire downwardly, and the desired material web (F) is formed by the combined effect of said horizontal and vertical air currents.
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