Web monitoring

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D - Textiles, Paper

21

F

D21F 7/00 (2006.01) B65H 20/06 (2006.01) B65H 26/02 (2006.01) D21G 9/00 (2006.01) G01N 33/36 (2006.01)

Patent

CA 2392067

A process and device to detect the presence of a fibrous material web in machines for manufacturing the same, whereby the fibrous material web is guided by at least one continuously circulating belt. The process includes measuring at least one of (1) a temperature of a side of the fibrous material web opposite the at least one belt while it is being supported by the at least one belt, (2) a temperature of a material web supporting side of the side of the at least one belt after transfer of the fibrous material web to a following unit, and (3) the temperature of a side of the at least one belt opposite the fibrous material web supporting side of the at least one belt. The process also includes detecting a change in the at least one measured temperature as an indicator of the presence or lack of fibrous material or the strip in an area in the machine in the vicinity of the measuring.

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