Paper making and fiber liberation – Apparatus – Web creping or crinkling type
Patent
1992-08-27
1999-08-31
Lamb, Brenda A.
Paper making and fiber liberation
Apparatus
Web creping or crinkling type
162263, 36447102, B31F 112
Patent
active
059449586
ABSTRACT:
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 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 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).
REFERENCES:
patent: 3778861 (1973-12-01), Goodnow
patent: 4919756 (1990-04-01), Sawdai
patent: 4970895 (1990-11-01), Houghton et al.
patent: 4978861 (1990-12-01), Sabater et al.
patent: 5221351 (1993-06-01), Esser et al.
"Creping Characteristics Sensor" by Techpap of Gieres Mayencin, France.
J.H. Sloan, "Yankee Dryer Coatings", Tappi Journal, Aug. 1991, pp. 123-126.
R. Engstrom, "First in the World with On-Line Thickness Measurement for Soft Tissue Machines" as translated from Svensk Papperstidning, No. 6 1987 .
Lamb Brenda A.
Valmet-Karlstad AB
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