cylinder machine
A papermaking machine which utilizes a wire curved
around one or more cylinders or molds that are
partially immersed and rotated in vats containing
a dilute stock suspension. The pulp fibers cling
to the wire and are formed into sheets on the
cylinders as the water drains through and passes
out at the ends of the cylinders. The wet sheet is
couched off the cylinder onto a felt held against
the cylinder by a couch roll. Cylinder machines
consist of one of more cylinders, each of which
forms a sheet composed of the same or different
stocks. The multi-cylinder machine forms webs
which are successively couched one upon the other
before they enter the press section. This allows
for considerable variation in thickness and weight
of the finished sheet, as well as for the
formation of bristols. The press section and the
dry end of the cylinder machine are essentially
the same as those of the FOURDRINIER MACHINE .
The cylinder machine was invented in 1805 by the
Englishman Joseph Bramah, and was improved
considerably in 1808 by John Dickinson. In England
it is called a "board machine," or "vat machine."
(17 , 60 , 180 , 320 )
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