Apparatus for forming a multilayer jet of paper making stock

A multilayer headbox for delivering a stratified sheet-like jet to a forming surface of a paper making machine comprising spaced apart headbox walls defining an elongated, converging channel terminating in an exit opening, at least one partition member anchored in the headbox at its upstream end with its downstream end free and extending at least to the vicinity of said opening, said partition member extending from side to side in said channel and dividing the headbox into a plurality of shallow, converging channels extending to said opening for conveying a plurality of paper making stocks thereto and discharging a plurality of sheet-like jets of paper making stocks therefrom, in which the improvement comprises at least one partition member having a downstream end formed so that the jets of paper making stock are discharged from said opening in stacked, spaced apart relation, with a gap therebetween, together with means for maintaining a wedge-shaped body of gaseous fluid in the gap between said discharged jets of paper making stock at the downstream end of said partition member to keep the jets separated for a predetermined distance beyond said opening in the direction of said forming surface.