Headbox

Abstract From the Canadian patent

A headbox is disclosed for ejecting stock onto a forming wire of a papermaking machine. The headbox includes an upper, lower, first and second side wall with, each of the side walls extending between the upper and the lower walls such that the upper, lower and side walls define therebetween a slice chamber for the passage therethrough of a primary flow of the stock. A secondary flow of stock is injected laterally relative to the primary flow such that the secondary flow extends through the side walls for controlling fiber orientation along the lateral side edges of the stock ejected from the headbox onto the forming wire.