Papermaking dryer section with partitioned vacuum box for thread

Details Papermaking dryer section with partitioned vacuum box for thread Papermaking dryer section with partitioned vacuum box for thread

1996-09-25

1999-02-23

Doerrler, William

Drying and gas or vapor contact with solids

Apparatus

Rotary drums or receptacles

34458, F26B 1102

Patent

active

058731806

ABSTRACT:
A single tier dryer system has dryer rolls with a reversing roll positioned between each pair to transfer and wrap the dryer felt and paper web against the next dryer roll. A vacuum box is positioned between the dryer rolls and over the reversing roll to hold the web on the dryer felt by vacuum. Threading of a tail from the web is accomplished by blowing the web tail off a first dryer roll's surface with a jet of air positioned adjacent to the position on the dryer roll where the dryer felt leaves the dryer roll's surface. The vacuum box is divided by a baffle to isolate a portion of the vacuum box near the front of the dryer rolls, and a damper is positioned within the reversing roll to increase the vacuum in the isolated portion of the vacuum box to facilitate threading of the tail.

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