CYLINDER MACHINE

device for producing paper, paperboard, and other fibreboards, invented in 1809 by John Dickinson. It consists of one or more tubes of wire screen partially immersed and rotated in a vat containing a mixture of pulp and water; the screen picks up a film from which the water drains, leaving a wet sheet that is transferred from the cylinder onto a felt in a continuous web. Cylinders may be used in more than one vat to produce films of varying properties before further drying by pressure and heat.