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Paper Machine Draw Calculation. The paper stock at this point in the process is 99% water and 1% fiber. The fan pump forces the paper stock through a set of nozzles in the head box onto the “wire” mesh.
Patent US4804441 Paper machine headbox and approach flow from www.google.com
In a paper machine, interrelated mechanisms operating in unison receive paper stock from the beater, form it into a sheet of the desired weight by filtration, press and consolidate the sheet with removal of excess water, dry the remaining water by evaporation, and wind the traveling sheet into reels of paper. Paper machines may vary in width from about 1.5 to 8 metres (5 to 26 feet), in. Paper machines may vary in width from about 5 to over 30 feet, and operate at speeds up to 1800 m/min.
Patent US4804441 Paper machine headbox and approach flow
Paper machines may vary in width from about 5 to over 30 feet, and operate at speeds up to 1800 m/min. To design a machine which will produce less noise and vibrations. For the purpose of computing the machine hour rate, each machine (or a group of similar machines) becomes a cost centre and all overheads are charged to a machine cost centre or to different machine cost centres if many such centres have been created within the department. The drawing ratio is a measure of the severity of the drawing operation and is the ratio of the initial blank diameter to the punch diameter.
