JP2004263309A5 - - Google Patents

Claims (11)

A paper machine control method for controlling at least wet part retention and ash content in paper by automatic control in a paper machine,
By incorporating a non-interference control function between the feedback loop that automatically controls the retention and the feedback loop that automatically controls the ash content in the paper, the influence of mutual interference between the two loops is canceled out. The control method of the paper machine. The automatic control of the retention is a control for measuring the white water concentration of the wire part in the wet part and increasing or decreasing the amount of the yield improver added to the raw material according to the white water concentration.
The automatic control of the ash content in the paper is characterized in that the ash content in the paper after paper drying is measured and the ash content added to the raw material is increased or decreased according to the ash content. The paper machine control method according to claim 1. White water concentration of the wire part to be measured in the automatic control of the retention is described 請 Motomeko 2 you wherein concentration der Rukoto of white water flowing down to the white water silo under the wire are filtered from the wire of the wire part Control method for the machine. The decoupling control function, the amount of interference the two feedback loops mutually interfere with each other in any one of claims 1 to 3, wherein the use of non-interference element to perform static characteristic compensation for compensating the same time The paper machine control method described. Any said decoupling control function, of claims 1 to 3 wherein both feedback loop wherein Rukoto using incoherent elements performing dynamic characteristic compensation that compensates taking into account the amount of interference a time lag mutually interfere with each other A control method for a paper machine as set forth in claim 1 . In a paper machine, a control device for a paper machine that controls at least the retention in the wet part and the ash content in the paper by an automatic control system,
The automatic control system is
A feedback loop for automatic control of the retention;
A feedback loop that automatically controls the ash content in the paper;
A non-interference control unit incorporated between the two feedback loops to cancel the influence of mutual interference between the two feedback loops;
A control device for a paper machine. A feedback loop that automatically controls the retention is added to the raw material based on a deviation between a white water concentration detected by the densitometer and a predetermined target value, and a concentration meter that measures the white water concentration of the wire part in the wet part. And a control unit that sends a control signal to the retention operation end in the paper machine process so as to increase or decrease the amount of yield improver added.
The feedback loop for automatically controlling the ash content in the paper is based on an ash content detecting means for measuring the ash content in the paper after the paper is dried, and a deviation between the ash content detected by the ash content detecting means and a predetermined target value. An ash content control unit that outputs a control signal to the ash content operation end in the paper machine process so as to increase or decrease the amount of ash content added to the raw material,
The decoupling control unit, a control apparatus of a paper machine according to claim 6, characterized in that it comprises a non-interference elements to compensate for the amount of interference mutually interfere with each other.   8. The paper machine according to claim 7, wherein the non-interference element is a feedforward compensation element that is input to a front stage of each operation end of each feedback loop to compensate for an interference amount that mutually interferes. Control device.   9. The paper machine control device according to claim 8, wherein the non-interference element is obtained based on a response block of each feedback loop and an interference block causing mutual interference between both feedback loops. Program for executing a computer control method according to any one of claims 1 to 5.   A storage medium storing the program according to claim 10 and readable by a computer.