Patent Number: 6,251,225

Title: Process for regulating the breaking length ratio of a manufactured paper web

Abstract: A process and apparatus for controlling a breaking length ratio L/Q of a web. The process includes providing a fluid fiber layer using a headbox havng a headbox nozzle, producing a web from the fluid fiber layer, measuring a current breaking length ratio L/Q.sub.CURR of the web, comparing the current breaking length ratio L/Q.sub.CURR with a preset breaking length ratio L/Q.sub.SET, determining a deviation between L/Q.sub.CURR and L/Q.sub.SET, and adjusting a microturbulence in a vicinity of said headbox nozzle to change the deviation. The apparatus includes a machine having a headbox, the headbox has at least one headbox nozzle, at least one mechanism is used for influencing a microturbulence of a stock suspension flowing out of the headbox nozzle, at least one measuring device is used for measuring a current breaking length ratio L/Q.sub.CURR of the web, and a regulating device for changing the microturbulence, wherein the microturbulence is adjusted to change the L/Q.sub.CURR.

Inventors: Ruf; Wolfgang (Herbrechtingen, DE), Heissenberger; Otto L. (Pottenbrunn, AT)

Assignee: Voith Sulzer Papiertechnik Patent GmbH

International Classification: D21G 9/00 (20060101); D21F 1/02 (20060101); D21F 011/00 ()

Expiration Date: 06/26/2018