F - Mech Eng,Light,Heat,Weapons – 26 – B
Patent
F - Mech Eng,Light,Heat,Weapons
26
B
34/22
F26B 13/08 (2006.01) D21F 5/04 (2006.01)
Patent
CA 1194690
ABSTRACT OF THE DISCLOSURE Web breaks occurring in the drying section of fast- running paper machines are among the most important factors limi- ting the increasing of paper machine speeds. With a view to avoiding these drawbacks a paper-machine multiple cylinder dryer is disclosed which comprises a number of drying cylinders , in conjunction with which a drying fabric is used which supports the web from one cylinder to the other in closed conduction. Furthermore, one or more supporting fabrics are used in the dryer, which support the web on the cylinders. The runs of the web supported by the drying fabric, the free surfaces of the drying cylinders and the runs of the supporting fabric confine elongated pockets associated with the cylinders. With a view to elimi- nating the drawbacks mentioned, the pockets in the direction of travel of the web, at least in the initial part of the dryer are maintained at a pressure higher than the ambient atmospheric pressure. The running of the web can be substantially stabilized by this expedient For the purpose of producing the over-pressure, both ends of the pockets can be totally or partly closed with special closing members.
391295
Marks & Clerk
Valmet Oy
LandOfFree
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