초록 ▼

This invention relates to an improved air acceleration nozzle for use in airlay web formers which reduce the creation of large scale vortices and turbulence. The nozzle accelerates the air by reducing the cross sectional area of the conduit. The size of the conduit for the air is reduced in both lat

This invention relates to an improved air acceleration nozzle for use in airlay web formers which reduce the creation of large scale vortices and turbulence. The nozzle accelerates the air by reducing the cross sectional area of the conduit. The size of the conduit for the air is reduced in both lateral dimensions, and more preferably, both dimensions are reduced with smoothly curving, low angle peripheral walls.

대표청구항 ▼

A web forming installation for forming a web on a moving screen conveyor, the installation comprising: a fan for creating a flow of air; first large size ducting connected to said fan for carrying said flow of air; means associated with said large size ducting for reducing large scale turbulence and

A web forming installation for forming a web on a moving screen conveyor, the installation comprising: a fan for creating a flow of air; first large size ducting connected to said fan for carrying said flow of air; means associated with said large size ducting for reducing large scale turbulence and straightening said flow of air; second smaller size ducting associated with said first large size ducting for receiving said air flow from said large size ducting, said second smaller size ducting having a smaller cross section compared to said first large size ducting; a fiber disperser associated with said second smaller size ducting for dispersing fiber into said air flow in the second smaller size ducting; an acceleration device connected between said first large size ducting and said second smaller size ducting for accelerating said flow of air after said flow has been straightened and prior to fiber being dispersed therein, the acceleration device including opposite top and bottom walls and opposite side walls joined at their intersecting edges, an inlet end and an outlet end wherein said inlet end is connected to said first large size ducting and wherein the inlet end is substantially flat and straight at all of its top, bottom and sides thereof and is substantially the same cross section size as said first large size ducting, said outlet end is connected to said second smaller size ducting and wherein the outlet end is substantially flat and straight at all of its top, bottom and sides thereof and is substantially the same cross section size as said second smaller size ducting, and wherein at least two of said walls of said acceleration device which are opposite from one another converge toward one another in a curving manner between said inlet and outlet ends wherein said opposite curving walls have a continuously differentiable curvature over their entire length including the flat and straight inlet and outlet ends.