Patent ID: 8951389
Filing Date: 2015-02-10
Classification: D21F

Abstract:
1. A process comprising: operating a forming fabric of a Fourdrinier machine in a rush or drag mode to promote an initial machine direction alignment of paper fibers within a paper web deposited onto the forming fabric in a forming board section; adjusting height of a plurality of height adjustable blades in the forming board section, wherein the forming board section includes a plurality of fixed blades; adjusting angles of a plurality of angle adjustable foil blades, heights of a plurality of height adjustable foils blades, and vacuum levels on vacuum assisted dewatering units of a first set of elements in a low-vacuum section to immediately freeze the machine direction alignment of paper fibers and to produce a high amount of turbulence to keep the paper fibers mobile and prevent entanglement; and adjusting angles of a plurality of angle adjustable foil blades, heights of a plurality of height adjustable foil blades, and vacuum levels of a second set of elements in a low-vacuum section to create moderate turbulence levels and prevent disruption of the machine direction alignment fiber orientation achieved in the initial sheet dewatering zone; wherein the second set of elements in the low-vacuum section are located downstream in of the first set of elements in a machine direction.