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:
Dec. 21, 1999
Filed:
Feb. 24, 1998
Scott B Pantaleo, Beloit, WI (US);
Beloit Technologies, Inc., Wilmington, DE (US);
Abstract
A headbox employs flow control valves which modulate the flow of stock through each tube of a tube bank, to give greater control over the cross machine direction flow of stock to the forming section of a papermaking machine. In one approach the flow through the tubes making up the tube bank is controlled by rotating cylindrical valve members which extend into portions of the tubes making up the tube bank. The valve members have channels which align with the tubes when the valve is fully opened. Rotation of the control member obstructs the tubes in the column until the desired level of flow from that column of tubes is obtained. In a second approach, pinch valves are created by constructing part of the tube from an elastic material and using air pressure, a cam or a twisting action to reduce the flow through the elastic section thus creating an adjustable valve. A third method employs guillotine valves which selectively block the flow of stock through a column of tubes.