The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 04, 1979
Filed:
Oct. 05, 1977
Alvi Kirjavainen, Jyvaskyla, FI;
Valmet Oy, , FI;
Abstract
A headbox of a paper machine includes a header chamber for receiving pulp stock, a distribution pipe system for receiving pulp stock from the header chamber, a flow-equalizing chamber for receiving pulp stock from the distribution pipe system, a turbulence passage system for receiving pulp stock from the flow-equalizing chamber, and a lip slice for receiving pulp stock from the turbulence passage system and discharging the pulp stock from the headbox. At least one of the above chambers is defined in part by a movable wall structure which has an inner surface contacting the pulp stock so that this movable wall structure can move in response to pressure fluctuations in the pulp stock. This wall structure has an outer surface which defines part of the hollow interior of an enclosure in which air under pressure is situated, so that through the movable wall structure the air under pressure can act on the pulp stock to damp pressure fluctuations thereof.