are shown in fig2 11 and are now briefly described fig2 a and 2b illustrate a headbox having individual mixed suspension streams 22 at q m c m delivered to the headbox in fig2 a the headbox has an entrance section 52 from the mixer not shown here individual section channels 54 in a vertical stack which are defined by partitions between them and a tapering outlet nozzle 56 leading to the outlet slot 58 from which the stream 62 still at total volume q m and concentration c m is sprayed into an inlet nip onto a wire former etc in the usual manner for headboxes fig2 b shows that there are individual streams q m 39 c m across the width of the machine each stream may be supplied by a separate control arrangement as in fig1 a or fig1 b the headbox entrance section is divided into individual sections 52a 52b etc across the width of the machine each of the entrance sections is an inlet which feeds a respective plurality of individual channels 54 which as can be seen from both of fig2 a and 2b are arrayed in rows and columns within the headbox there is a single combined outlet nozzle 56 through which the various flows from the channels 54 combine and then exit the headbox it is apparent that control over the individual volumes q m and concentrations of pulp or fiber c m will control the respective flows through the individual partitioned entrance sections 52a 52b 52c for.