min manufacturing5August 2018
OVERMADE receives a repeated order for a Dynaflo FL headbox from Pratt Industries for their  VP 15 at PRATT PAPER mill in Shreveport (USA). This second order  comes after the extremely positive results achieved in  one year operation with the first headbox delivered only in 2017. 

The headbox has been selected for the excellent distribution of the fiber it has shown  to grant, contributing to reach the highest  market standards of CD basis weight profile and paper properties. The target of this installation is – as it was of the first unit supplied in 2017 for the machine bottom layer -  to  improve web fiber distribution when  basis weights ranging from  100 to 273 gsm  are produced with a furnish of up to 80% mixed waste paper  and only 20% OCC. This will further increase the  efficiency of the forming section of VP 15,  which is recognised to rank first among the machines of the Group in terms of paper quality and line productivity.

Delivery of the unit is slated for March 2019. 

With  a pond width of 6200 mm and an operation output of approx. 500 tpd., the headbox is intended for the top layer of a machine producing up to 1200 tpd  of high quality testliner and fluting  at a speed of 1100 mpm.
The performances of the  DYNAFLOW-FL headbox are the result of  the latest innovations applied to the “DYNAFLO CONCEPT”, the exclusive turbulence generator developed in OVER's pilot plant.

The CD basis weight  profile is controlled by means of a dilution system. The headbox features an additional edge flow control system, capable of locally adjusting the flow from 60% to 160% of its nominal value, designed to optimize the  fiber orientation all across the paper width.
The headbox is supplied with stiff lamellas in the slice area  to maintain a high level  of micro-turbulence  up to the jet exit, thus improving  paper formation at high speeds.

DYNAFLOW-FL, the headbox for high speed Fourdrinier forming section,  is available also in a multilayer layout. Multilayer headbox permits to use stocks of different characteristics or qualities  to produce multilayer paper on a single forming section.