GB701581A - Improvements in or relating to paper making machines and method - Google Patents

Abstract

701,581. Flow-boxes of paper-making machines. PAPER PATENTS CO. Sept. 15. 1950 [Sept. 30, 1949], No. 22723/50. Class 96 Paper pulp from screens 65, Fig. 4, flows in a conduit 269, Figs. 3 and 4, past baffles 277 &c. and perforated relatively movable throttling plates (not shown) controlled at 287, which aid in mixing the flow from the different screens, the pulp being de-aerated by suction via a suction manifold 285 and pipes 283 and flowing down a vertical flow-spreader conduit 35, under a slice 39 to a pond-chamber 49, beneath a slice 37 and on to a Fourdrinier wire-cloth 23. The pond-chamber 49 may be under air pressure and may have a bleeder-pipe to maintain the level of pulp approximately constant, the top closure 149 of the pondchamber being hinged at 151 and 157, flexible sealing-sheets 159, 161, e.g. of stainless steel covering the hinges, the arrangement allowing adjustment of the two slices 39, 37, which is effected by power-operated units 85 and 141, movement of the slice 39 being conditioned by pivoted links 79, so that the flow passage. 47 tends to have the same general configuration at different positions of adjustment. Distributer or flow-evener rolls 191, 203 may be provided, the roll 191 being made adjustable by mounting it eccentrically in supports themselves eccentrically mounted in plates which may occupy either one of two positions. Seals as illustrated in Fig. 12, e.g. comprising synthetic rubber tubes in undercut grooves 165 are provided, e.g. adjacent a wall 41 of the flow-spreader conduit 35. A metal strip 207 at the lower edge of the slice 37 may move in guide strips and may be flexed by a series of adjustment-screws across the machine to provide local adjustment of the pulp delivery space.