METHOD AND APPARATUS FOR FORMING A PAPER WEB

摘要

A method and apparatus for beginning the formation of a paper web on a traveling forming wire, or between a pair of converging forming wires (40, 42), includes a headbox (44) on a papermaking machine for projecting a stock stream (46) onto the forming wire, or between the forming wires over the porous face surface of a forming shoe (10). The forming wire or wires are looped to travel in a continuous path, and within at least one of the looped forming wires is the forming shoe, which is porous by way of grooves or openings over at least a portion of its face surface. The grooves are in the surface of the forming shoe which engages the inner surface of the looped forming wire to define a portion of the path of travel of the forming wire adjacent the headbox from which the stock stream is projected onto, or between, the forming wire(s). The grooves extend in the surface facing the forming wire from a point downstream of the leading edge in the nose portion of the face surface of forming shoe in the direction of forming wire travel. The grooves are angled at a small angle relative to the direction of forming wire travel. The grooves or openings receive water through the forming wire to gradually reduce the amount of water in the stock to control the initial sta ge of the formation of the nascent paper web on the forming wire over the formi ng shoe.