D - Textiles – Paper – 21 – H
Patent
D - Textiles, Paper
21
H
D21H 25/12 (2006.01) B05C 11/02 (2006.01) D21H 23/66 (2006.01) D21H 25/16 (2006.01)
Patent
CA 2229118
A pre-metering rod is located between a coating applicator and an air knife, and replaces the smoothing roll in some existing air knife applications. The pre-metering rod consists of a small diameter rod of about one and one-half inches in diameter that rotates at 10-500 rpm against the direction of the coating layer on the web. The web is wrapped around a portion of the circumference amounting to about twenty-five degrees of the rod's surface as it travels over the rod. The rod is supported in a rod holder supported on a support beam. Actuators move the support beam away from the web for threading and maintenance, and towards the web to engage the rod with the web. The combination of the rod diameter, the amount of wrap on the rod, and the speed of the rod rotation determine the amount of pre-metering of the coating, which determines the thickness of the coating layer on the web that is presented to the air knife section. As a result, the thickness of the coating layer can be decreased. Decreasing the mass of the coating presented to the air knife decreases the momentum of the coating layer and allows the speed of the web to be increased to over 2,000 feet per minute as it passes through the air knife section.
Beloit Technologies Inc.
Metso Paper Inc.
Mitsubishi Heavy Industries Ltd.
Ridout & Maybee Llp
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