System for dry forming of paper or other sheet material of...

D - Textiles – Paper – 21 – F

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19/3

D21F 11/14 (2006.01) D04H 1/00 (2006.01)

Patent

CA 1150472

ABSTRACT OF THE DISCLOSURE For distributing loose fibres on a moving forming web in dry forming of paper an air fluidized fibre material is fed to and recirculated in a pipe circuit comprising two parallel, straight screen pipes extending over the forming web and pro- vided with interior, rotating needle cylinders operating to both convey the material axially in the pipe and effect dis- integration of the material as well as to add to the material flow a radial component promoting the fibre outlet through the walls of the screen pipes. These pipes themselves are rotat- ably mounted and adjacent an upper outside area of each pipe is arranged a stationary nozzle system for blowing compres- sed air against the pipe to thereby successively clean the screen perforations for maintaining a high distributor capacity and enable relatively long fibres to be used in the production.

373764

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