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:
Nov. 08, 1983
Filed:
Nov. 18, 1981
Alvi Kirjavainen, Jyvaskyla, FI;
Valmet OY, , FI;
Abstract
A headbox of a paper machine has a stock distribution header part, a distribution pipe assembly connected to the stock distribution header part, an equalizing passage following the distribution pipe assembly in the flow path of the stock suspension, an air tank in immediate communication with the equalizing passage and a converging slice part following the equalizing passage, the converging slice part having a lower lip wall and an adjustable upper lip wall. A turbulence section between the equalizing passage and the converging slice part has at least one exchangeable grating cassette consisting of at least two grating plates in abutment with each other. A first of the grating plates and in the direction of the stock flow and has a plurality of apertures formed therethrough.