of 200 1 000 degrees fahrenheit and air speeds of 8 000 40 000 feet per minute the felt employed is foraminous with a permeability of between 300 1 500 cubic feet per minute per square foot and is designed to withstand peak temperatures of up to 1 000 degrees fahrenheit and average temperatures of between 500 600 degrees fahrenheit a single dryer roll or more advantageously two vacuum rolls in a vacuum box are disposed between the dryer rolls to maximize the circumferential wrap of the web and at the same time support and transport the web between dryers application_number US 52704895 A description referring more particularly to fig1 3b wherein like numbers refer to similar parts a papermaking machine 20 is illustrated in fig3 a 3b the papermaking machine employs a dryer section 22 the dryer section is composed of dryer rolls 24 which are internally steam heated and will preferably have a diameter of eight to as large as twenty feet as opposed to conventional dryers of six feet in diameter the dryer rolls rotate about axes 26 the axes lying in a single plane such an arrangement of dryer rolls is known as a single tier dryer section a paper web 28 is wrapped onto the dryer rolls 24 by first a first felt 30 then a second felt 32 and finally a third felt 34 in.