D - Textiles – Paper – 21 – G
Patent
D - Textiles, Paper
21
G
D21G 3/04 (2006.01) B31F 1/14 (2006.01) D21G 3/00 (2006.01) D21H 25/00 (2006.01)
Patent
CA 2117082
2117082 9306300 PCTABS00021 To carefully control the creping conditions when creping off a paper web (1) by means of a doctor blade (5) from the cylinder surface (2) of a Yankee dryer (3), a first sensor (82; 85) is provided for measuring on-machine a value of the caliper, the crepe macrostructure, or some other physical property of the just creped off paper web (1), the measured value is monitored continually, and, on detecting an undesirable change in the value caused by blade wear, the doctor blade (5) is pivoted substantially around its working edge (6) to increase an impact angle (A), formed at the working edge and affecting the monitored web property, to such an extent as to substantially minimize or at least counteract the undesirable change. Preferably, the sensor (82; 85) is connected to a programmable processor (90) for automatically controlling the pivoting of the doctor blade (5). A web tension sensor (94) suitably is provided for continually monitoring a coating on the cylinder surface (2) and may be connected to the programmable processor (90), which then is programmed to control the properties of the coating by adjusting the amounts of an adhesive agent and a release agent in a coating composition to be applied onto the cylinder surface (2).
Gowling Lafleur Henderson Llp
Valmet-Karlstad Ab
LandOfFree
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