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. 28, 1976
Filed:
Apr. 10, 1975
Lawrence Vaalburg, Brookhaven, PA (US);
Scott Paper Company, Philadelphia, PA (US);
Abstract
Web forming apparatus of this invention includes a fiberizing roll for separating fibers from a feed mat and entraining them in a gaseous medium, a foraminous forming surface through which the gaseous medium passes and upon which the fibers are condensed to form a fibrous web and a formation duct having an upstream end adjacent the fiberizing roll and a downstream end adjacent the forming surface, whereby the formation duct defines a flow path for the gaseous suspension of fibers from the fiberizing roll to the forming surface; the improvement including passageways at opposite sides of the apparatus adjacent the upstream end of the formation duct for communicating the duct with an atmosphere having a lower pressure than that within the duct for removing air to eliminate the adverse effect of vortices which are created by rotation of the fiberizing roll. A method of forming a fibrous web by employing the abovedescribed apparatus also forms a part of this invention.