Patent ID: 6210535
Filing Date: 2001-04-03
Classification: D21F

Abstract:
A combination of a multi-layer headbox including inlet headers situated vertically one above another and a stock feed system for feeding stock to the inlet headers of the multi-layer headbox, the stock feed system comprisinga single fresh stock tank for retaining stock,a branching member,a first flow line having first and second opposed ends, said first end of said first flow line being connected to said single fresh stock tank and said second end of said first flow line being connected to said branching member, a single flow of fresh stock being passed through said first flow line from said single fresh stock tank to said branching member and being divided in said branching member into a plurality of stock flows without storing said single flow of fresh stock between said single fresh stock tank and said branching member,at least second and third flow lines each having first and second opposed ends and through each of which a respective one of said divided stock flows passes, said first ends of said second and third flow lines being connected to said branching member and said second ends of said second and third flow lines leading to a respective one of said inlet headers of said headbox, a respective one of said divided stock flows being passed through each of said second and third flow lines from said branching member without storing said divided stock flows between said branching member and said inlet headers,means for independently adding chemicals and/or fillers to each of said divided stock flows during the flow of said divided stock flows through a respective one of said at least second and third flow lines after said branching member and before entry of said divided stock flows into said inlet headers such that stock in each inlet header has an independently controllable chemical and/or filler characteristic, anddiluting means for adjusting the consistency of at least one of said divided stock flows such that said at least one of said divided stock flows has a consistency independently adjustable with respect to the consistency of other of said divided stock flows, said diluting means comprising conduit means for passing a diluting-water flow into said at least one of said divided stock flows as said at least one of said divided stock flows is passing through a respective one of said at least second and third flow lines prior to entry of said at least one of said divided stock flows into the respective one of said inlet headers of said headbox.