Dryer section in a paper machine in which impingement and/or ven

Details Dryer section in a paper machine in which impingement and/or ven Dryer section in a paper machine in which impingement and/or ven

1998-04-22

2000-08-15

Wilson, Pamela A.

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34120, 162207, 1623591, F26B 1102

Patent

active

061017353

ABSTRACT:
A dryer section of a paper machine including groups with single-wire draw that include a drying wire guided in a loop and reversing cylinders arranged in the drying-wire loop. Contact drying cylinders are arranged in gaps between the reversing cylinder and the drying wire is guided to press a web against heated faces of the contact drying cylinders. In addition to normal, small-diameter contact drying cylinders, one or more large-diameter contact drying cylinders (the diameter being greater than about 2200 mm and usually in a range from 2200 mm to 3600 mm), is/are used in one or more single-wire draw groups. An impingement-drying/ventilation hood is arranged above the large-diameter contact drying cylinders and extends on a large sector above the contact drying cylinder and above the drying wire and the web running over the cylinder. An impingement-drying/ventilation effect is applied to the drying wire through the impingement-drying/ventilation hoods on the large sector. By means of the effect, a moist boundary layer in contact with the drying wire is disintegrated and drying is promoted from a side of a face of the web opposite to the web face that is placed against the contact drying cylinders.

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PCT Application, WO 96/32534, World Intellectual Property Organization, Oct. 1996.

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