Regulation system for the short circulation and headbox of a paper machine or equivalent

A method of forming a paper web on a papermaking machine comprising the steps of:

• flowing a quantity of papermaking stock through a headbox to form a cross machine direction extending stock suspension jet;
• feeding the jet into a wire section of the papermaking machine;
• continuously measuring within the headbox a cross machine direction mobility profile;
• and
• responsive to the cross machine direction mobility profile adjusting at least one turbulence generator positioned within the headbox.

A headbox of a paper machine, comprising:

• stock inlet header;
• a tube bank in stock receiving relation with the stock inlet header;
• a turbulence generator in stock receiving relation with the tube bank;
• a slice channel in stock receiving relation with the turbulence generator;
• a plurality of means for measuring fibre mobility arrayed in the cross machine direction and mounted to the headbox, and
• means for changing mobility of stock within the headbox on the basis of measurement data obtained from the sensors.

A short circulation of a paper machine, comprising:

• a wire pit;
• apparatus for diluting thick stock into headbox consistency stock;
• apparatus for cleaning stock to be fed into the headbox;
• a headbox;
• piping connecting the wire pit to the apparatus for diluting thick stock into headbox consistency stock, and connecting the apparatus for diluting thick stock into headbox consistency stock to the apparatus for cleaning stock, and connecting the apparatus for cleaning stock to the bead box;
• a sensor arranged within the short circulation of the paper machine to measure the fibre mobility of the fibre suspension in the short circulation;
• a means for changing the mobility at a selected location within the short circulation, the means in data receiving relation to the sensor, the means forming a part of the short circulation of the papermaking machine data receiving relation to the plurality of fibre mobility sensors.

A headbox in a papermaking machine comprising:

• a stock inlet header;
• a tube bank in stock receiving relation with the stock inlet header;
• a slice forming a slice channel in stock receiving relation to the tube bank;
• a plurality of fiber mobility sensors mounted on the slice, to form a cross machine direction array which provides a cross machine direction mobility profile;
• a plurality of structures for producing adjustable turbulence positioned in the headbox, in data receiving relation to the plurality of fiber mobility sensors, the plurality of structures for producing turbulence being adjustable so as to control the cross machine direction mobility profile.