Paper making and fiber liberation – Processes and products – Non-uniform – irregular or configured web or sheet
Patent
1988-08-26
1990-04-24
Jones, W. Gary
Paper making and fiber liberation
Processes and products
Non-uniform, irregular or configured web or sheet
162198, 162260, 162262, 162281, 152565, 1525651, 100174, 101425, 355 15, D21G 300
Patent
active
049197568
ABSTRACT:
A method of and apparatus for adjusting the impact angle of a doctor blade are provided to at least partially offset negative effects of doctor blade wear. For example and not by way of limitation, in papermaking machines for making creped tissue paper, a negative effect of progressive doctor blade wear is progressive diminution of machine-direction tensile strength of the paper, all other operating factors being constant. That is, machine-direction tensile strength of the paper is inversely related to doctor blade wear which wear is, generally speaking, directly related to operating time. This progressive lessening of the paper's machine-direction tensile strength can be at least partially offset or compensated for by adjusting the impact angle of the doctor blade. Albeit such adjusting might be effected by small manual adjustments at frequent intervals, it is preferably continually effected automatically in accordance with this invention using open or closed loop controller systems: for instance, open loop control as a function of time which function may be developed and iteratively refined through the use of empirical data; or closed loop control using a sensed property (e.g., tensile strength or burst strength) of the material being doctored as a control parameter and causing a closed loop control system to adjust the doctor blade as required to optimize the sensed property.
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Huston Larry L.
Jones W. Gary
Pollaro John M.
Slone Thomas J.
The Procter & Gamble & Company
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