Peak responsive control system and method

Claim 1

A SYSTEM FOR CONTROLLING A PROPERTY OF AN OUTPUT OF A SHEET PROCESSOR COMPRISING GAUGE MEANS MONITORING THE PROPERTY FOR DERIVING A SIGNAL THAT IS A REPLICA OF PROPERTY VARIATIONS BEOF THE OUTPUT, MEANS FOR SCANNING THE GAUGE IN A DIRECTION BETWEEN EDGES OF THE SHEET, MEANS RESPONSIVE TO THE SIGNAL REPLICA FOR SELECTING THE PEAK VALUE OF THE PROPERTY DERIVED FROM AT LEAST ONE SCAN OF THE GAUGE MEANS IN A DIRECTION BETWEEN THE EDGES, SAID SELECTED PEAK VALUE BEING THE PEAK VALUE WHICH IS DISPLACED BY THE GREATEST EXTENT FROM A NOMINAL VALUE FOR THE PROPERTY OVER THE SCAN, MEANS RESPONSIVE TO SAID SELECTING MEANS FOR CONTROLLING THE PROCESSOR IN RESPONSE TO A COMPARISON OF THE SELECTED PEAK VALUE WITH A PREDETERMINED LIMIT VALUE FOR THE PROPERTY SO THAT THE SELECTED PEAK VALUE IS CONTROLLED TO APPROACH SAID LIMIT VALUE, SAID CONTROL MEANS INCLUDING MEANS FOR CONTROLLING THE PROCESSOR BY AN AMOUNT INDICATIVE OF THE DERIVATION OF THESELECTED PEAK VALUE FROM THE PREDETERMINED LIMIT VALUE.

Claim 2

A SYSTEM FOR CONTROLLING A PROPERTY OF AN OUTPUT OF A SHEET PROCESSOR COMPRISING GAUGE MEANS MONITORING THE PROPERTY FOR DERIVING A SIGNAL THAT IS A REPLICA OF PROPERTY VARIATIONS BEOF THE OUTPUT, MEANS FOR SCANNING THE GAUGE IN A DIRECTION BETWEEN EDGES OF THE SHEET, MEANS RESPONSIVE TO THE SIGNAL REPLICA FOR SELECTING THE PEAK VALUE OF THE PROPERTY DERIVED FROM AT LEAST ONE SCAN OF THE GAUGE MEANS IN A DIRECTION BETWEEN THE EDGES, SAID SELECTED PEAK VALUE BEING THE PEAK VALUE WHICH IS DISPLACED BY THE GREATEST EXTENT FROM A NOMINAL VALUE FOR THE PROPERTY OVER THE SCAN, MEANS RESPONSIVE TO SAID SELECTING MEANS FOR CONTROLLING THE PROCESSOR IN RESPONSE TO A COMPARISON OF THE SELECTED PEAK VALUE WITH A PREDETERMINED LIMIT VALUE FOR THE PROPERTY SO THAT THE SELECTED PEAK VALUE IS CONTROLLED TO APPROACH SAID LIMIT VALUE, SAID CONTROL MEANS INCLUDING MEANS FOR CONTROLLING THE PROCESSOR BY AN AMOUNT INDICATIVE OF THE DERIVATION OF THESELECTED PEAK VALUE FROM THE PREDETERMINED LIMIT VALUE.

Claim 3

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting a peak value of the property from the set as derived from at least one scan of the gauge means, the detected peak value being a peak value displaced by the greatest extent from a nominal value for the set of values, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 4

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting a peak value of the property from the set as derived from at least one scan of the gauge means, the detected peak value being a peak value displaced by the greatest extent from a nominal value for the set of values, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 6

A system for controlling basis weight of a fibrous sheet being made by a fibrous sheet making machine comprising gauge means scanning between the sheet edges for detecting a minimum basis weight value of the sheet from at least one scan, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and means responsive to said gauge means for controlling the sheet fiber-water ratio in response to a comparison of the detected minimum value with a predetermined limit minimum value for the property so that the detected minimum value is controlled to approach said limit minimum value.

Claim 7

A system for controlling basis weight of a fibrous sheet being made by a fibrous sheet making machine comprising gauge means scanning between the sheet edges for detecting a minimum basis weight value of the sheet from at least one scan, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and means responsive to said gauge means for controlling the sheet fiber-water ratio in response to a comparison of the detected minimum value with a predetermined limit minimum value for the property so that the detected minimum value is controlled to approach said limit minimum value.

Claim 8

A system for controlling moisture and basis weight of a fibrous sheet being made by a fibrous sheet making machine, comprising gauge means scanning between the sheet edges for detecting a maximum moisture value and minimum basis weight value of the sheet from at least one scan, the detected maximum value being the moisture value displaced by the greatest extent from a nominal value for the sheet moisture, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and means responsive to said gauge means for controlling the sheet moisture in response to a comparison of the detected maximum value with a predetermined limit value for moisture so that the detected maximum value is controlled to approach said moisture limit value and for controlling the sheet basis weight in response to a comparison of the detected minimum value with a predetermined limit value for basis weight so that the detected minimum value is controlled to approach said basis weight limit value.

Claim 9

A system for controlling moisture and basis weight of a fibrous sheet being made by a fibrous sheet making machine, comprising gauge means scanning between the sheet edges for detecting a maximum moisture value and minimum basis weight value of the sheet from at least one scan, the detected maximum value being the moisture value displaced by the greatest extent from a nominal value for the sheet moisture, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and means responsive to said gauge means for controlling the sheet moisture in response to a comparison of the detected maximum value with a predetermined limit value for moisture so that the detected maximum value is controlled to approach said moisture limit value and for controlling the sheet basis weight in response to a comparison of the detected minimum value with a predetermined limit value for basis weight so that the detected minimum value is controlled to approach said basis weight limit value.

Claim 11

A method of controlling the basis weight of a sheet being made by a fibrous sheet producing facility comprising the steps of scanning a gauge means for detecting basis weight in a direction between the sheet edges, detecting a minimum basis weight value derived by the gauge means during the time it is scanned at least once between the sheet edges, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and controlling the sheet fiber-water ratio in response to deviation of the detected minimum value relative to a predetermined minimum limit value for the basis weight so that the detected peak value is controlled to approach said limit value.

Claim 12

A method of controlling the basis weight of a sheet being made by a fibrous sheet producing facility comprising the steps of scanning a gauge means for detecting basis weight in a direction between the sheet edges, detecting a minimum basis weight value derived by the gauge means during the time it is scanned at least once between the sheet edges, the detected minimum value being the basis weight value displaced by the greatest extent from a nominal value for the sheet basis weight, and controlling the sheet fiber-water ratio in response to deviation of the detected minimum value relative to a predetermined minimum limit value for the basis weight so that the detected peak value is controlled to approach said limit value.

Claim 13

A method of controlling the basis weight and moisture of a sheet being made by a fibrous sheet producing facility comprising the steps of scanning a gauge means between edges of the sheet, detecting a maximum value of sheet moisture and minimum value of sheet basis weight derived by the gauge means during the time it is scanned at least once between the sheet edges, the detected maximum value being the sheet moisture value displaced by the greatest extent from a nominal value for the sheet moisture value and the detected minimum value being the sheet basis weight displaced by the greatest extent from a nominal value for the sheet basis weight, and controlling dryer sections of the facility and the water-fiber consistency flowing into the facility respectively in response to deviations between predetermined maximum and minimum limit values of moisture and basis weight relative to the detected maximum moisture value and minimum basis weight so that the sheet detected maximum moisture value is controlled to approach the moisture limit value and the sheet detected minimum basis weight value is controlled to approach the basis weight limit value.

Claim 14

A method of controlling the basis weight and moisture of a sheet being made by a fibrous sheet producing facility comprising the steps of scanning a gauge means between edges of the sheet, detecting a maximum value of sheet moisture and minimum value of sheet basis weight derived by the gauge means during the time it is scanned at least once between the sheet edges, the detected maximum value being the sheet moisture value displaced by the greatest extent from a nominal value for the sheet moisture value and the detected minimum value being the sheet basis weight displaced by the greatest extent from a nominal value for the sheet basis weight, and controlling dryer sections of the facility and the water-fiber consistency flowing into the facility respectively in response to deviations between predetermined maximum and minimum limit values of moisture and basis weight relative to the detected maximum moisture value and minimum basis weight so that the sheet detected maximum moisture value is controlled to approach the moisture limit value and the sheet detected minimum basis weight value is controlled to approach the basis weight limit value.

Claim 15

A system for deriving a signal indicative of a property of a longitudinally moving sheet comprising means for measuring a parameter related to the property, means for scanning said measuring means in a direction between edges of the moving sheet, means responsive to the scanning measuring means for decoupling peak values of the parameter having durations less than a predetermined time interval from the peak value detecting means, means responsive to the measuring means for detecting the peak value of the parameter for each scan of the measuring means, the peak value detected being the peak value displaced by the greatest extent from a nominal value for the parameter, and output means responsive only to the detected peak value for each scan for deriving a signal indicative of the detected peak value.

Claim 16

A system for deriving a signal indicative of a property of a longitudinally moving sheet comprising means for measuring a parameter related to the property, means for scanning said measuring means in a direction between edges of the moving sheet, means responsive to the scanning measuring means for decoupling peak values of the parameter having durations less than a predetermined time interval from the peak value detecting means, means responsive to the measuring means for detecting the peak value of the parameter for each scan of the measuring means, the peak value detected being the peak value displaced by the greatest extent from a nominal value for the parameter, and output means responsive only to the detected peak value for each scan for deriving a signal indicative of the detected peak value.

Claim 19

A system for controlling a property of an output of a sheet processor comprising gauge means monitoring the property for deriving a signal that is a replica of property variations of the output, means for scanning the gauge in a direction between edges of the sheet, means responsive to the signal replica for selecting the greatest maximum peak value of the property derived from at least one scan of the gauge means in a direction between the edges, means responsive to said selecting means for controlling the processor in response to a comparison of the selected peak value with a predetermined limit value for the property so that the selected peak value is controlled to approach said limit value, said control means including means for controlling the processor by an amount indicative of the deviation of the selected peak value from the predetermined limit value.

Claim 20

A system for controlling a property of an output of a sheet processor comprising gauge means monitoring the property for deriving a signal that is a replica of property variations of the output, means for scanning the gauge in a direction between edges of the sheet, means responsive to the signal replica for selecting the greatest maximum peak value of the property derived from at least one scan of the gauge means in a direction between the edges, means responsive to said selecting means for controlling the processor in response to a comparison of the selected peak value with a predetermined limit value for the property so that the selected peak value is controlled to approach said limit value, said control means including means for controlling the processor by an amount indicative of the deviation of the selected peak value from the predetermined limit value.

Claim 21

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest maximum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 22

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest maximum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 23

A system for controlling moisture of a fibrous sheet being made by a fibrous sheet making machine comprising gauge means scanning between the sheet edges for detecting a maximum moisture value of the sheet from at least one scan, the detected maximum value being the moisture value displaced by the greatest extent from a nominal value for the sheet moisture, and means responsive to said gauge means for controlling the sheet fiber-water ratio in response to a comparison of the detected maximum value with a predetermined limit maximum value for the property so that the detected maximum value is controlled to approach said limit maximum value.

Claim 24

A system for controlling moisture of a fibrous sheet being made by a fibrous sheet making machine comprising gauge means scanning between the sheet edges for detecting a maximum moisture value of the sheet from at least one scan, the detected maximum value being the moisture value displaced by the greatest extent from a nominal value for the sheet moisture, and means responsive to said gauge means for controlling the sheet fiber-water ratio in response to a comparison of the detected maximum value with a predetermined limit maximum value for the property so that the detected maximum value is controlled to approach said limit maximum value.

Claim 25

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest minimum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 26

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest minimum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 27

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest maximum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling an actuator for the average value of a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 28

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting the greatest maximum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling an actuator for the average value of a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 29

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting The greatest minimum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling an actuator for the average value of a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.

Claim 30

A system for controlling a sheet processor comprising gauge means for detecting and measuring a set of values indicative of a property of the sheet at a plurality of points across the width thereof, means for scanning the gauge means in a direction between the sheet edges, processing means for detecting The greatest minimum peak value of the property from the set as derived from at least one scan of the gauge means, means responsive to said processing means for controlling an actuator for the average value of a parameter of the sheet affecting the property in response to a comparison of the detected peak value with a predetermined limit value for the property so that the detected peak value is controlled to approach said limit value.