Abstract 1.In a process for forming fibrous sheets that includes the steps of entraining a web in a gaseous stream flowing in a generally horizontal path toward one location on a baffle, directing and oscillating said web and aid stream from said one location in a plurality of downward radial directions in a vertical plane through ambient gas toward a collecting means, electrostatically charging the web, and collecting said web on said collecting means as a fibrous sheet, the improvement comprising: converging said stream below said steam below said baffle in said downward radial directions within a shield presenting substantially equal flow impedances in said radial directions for a distance of from 30 to 60 percent of the distance from said one location to said collecting means thereby maintaining the steam entrained web substantially as formed by said baffle and preventing premature with said ambient gas.
In a process for forming fibrous sheets that includes the steps of entraining a web in a gaseous stream flowing in a generally horizontal path toward one location on a baffle, directing and oscillating said web and aid stream from said one location in a plurality of downward radial directions in a vertical plane through ambient gas toward a collecting means, electrostatically charging the web, and collecting said web on said collecting means as a fibrous sheet, the improvement comprising: converging said stream below said steam below said baffle in said downward radial directions within a shield presenting substantially equal flow impedances in said radial directions for a distance of from 30 to 60 percent of the distance from said one location to said collecting means thereby maintaining the steam entrained web substantially as formed by said baffle and preventing premature with said ambient gas.
Claim 2
Dependent Claim
145 words
In a process for forming fibrous sheets that includes the steps of entraining a web in a gaseous stream flowing in a generally horizontal path toward one location on a baffle, directing and oscillating said web and aid stream from said one location in a plurality of downward radial directions in a vertical plane through ambient gas toward a collecting means, electrostatically charging the web, and collecting said web on said collecting means as a fibrous sheet, the improvement comprising: converging said stream below said steam below said baffle in said downward radial directions within a shield presenting substantially equal flow impedances in said radial directions for a distance of from 30 to 60 percent of the distance from said one location to said collecting means thereby maintaining the steam entrained web substantially as formed by said baffle and preventing premature with said ambient gas.