Winding – tensioning – or guiding – Material guide or guard – Fluid suspension
Patent
1999-05-05
2000-12-05
Matecki, Katherine A.
Winding, tensioning, or guiding
Material guide or guard
Fluid suspension
226 973, 34633, 34636, B65H 2324
Patent
active
061555185
ABSTRACT:
Apparatus for levitated guidance of a material web moving in a travel direction, includes a blow box which defines an air chamber in communication with a source for supply of blowing air. The blow box has a planar surface portion positioned in facing relationship to the material web and formed vith at least one row of nozzles. Side walls converge from the curved edge zones of the surface portion and diverge toward the material web, to thereby demarcate a pressure conversion compartment of trapezoidal cross section. Arranged adjacent the side walls are diffusion channels which are directly connected with the air chamber of the blow box. The side walls are formed with passageways for fluidly connecting the pressure conversion compartment with the diffusion channels, thereby generating linear jet streams which exit through slots extending transversely to the travel direction of the material web and defined by the side walls and by boundary walls of the diffusion channels in facing relationship to the material web. The row of nozzles is positioned at a central location between the slots and has an opening cross section which is greater than a total opening cross section of all passageways in the side walls. Thus, blowing air issuing out through the nozzles have only a slight dynamic portion so that the material web is guided on an air cushion at constant distance to the surface portion and dried.
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Feiereisen Henry M.
Langbein & Engelbracht GmbH
Matecki Katherine A.
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