F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
271/72
F26B 5/00 (2006.01) B65H 23/24 (2006.01)
Patent
CA 1159857
PREVENTING AIR FILM BETWEEN WEB AND ROLLER Abstract of the Disclosure A web moving in one direction and having partial wrapping engagement with a cylindrical surface of a rotating roller is impacted by an air jet which forces it into inti- mate contact with the roller, preventing intrusion of an air film between the roller and the portion of the web curved around it. The jet issues from a nozzle to which pressure air is fed (at, e.g., 3 psi) and the outlet of which is a slot long enough to extend across the full width of the web but as narrow as feasible, e.g., .030 in. The nozzle is so arranged that the jet impacts the web within a short distance (e.g., 1/2 in.) in the direction of web travel from the line of tangency of the web to the roller, and is close enough to the web (e.g., about 1/8 in.) to avoid substantial dispersion or divergence of the jet before it impacts the web. Effectiveness of the jet is due to the high pressure gradient in the direction of web travel that it imposes upon the web, not to absolute pressure.
396429
Megtec Systems Inc.
Smart & Biggar
LandOfFree
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