| 摘要 |
<p>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 above described apparatus also forms a part of this invention.</p> |
