Patent ID: 6706149
Filing Date: 2004-03-16
Classification: B65H,D21F

Abstract:
A process to detect the presence of one of a paper, cardboard, tissue or other fibrous material web or a strip of the fibrous material web in machines for at least one of manufacturing and finishing the fibrous material web, whereby the fibrous material web is guided by at least one continuously circulating belt, said process comprising: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) a temperature of a side of the at least one belt opposite the fibrous material web supporting side of the at least one belt; and 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.