Drying and gas or vapor contact with solids – Apparatus – Rotary drums or receptacles
Reexamination Certificate
2005-10-11
2005-10-11
Gravini, Stephen (Department: 3749)
Drying and gas or vapor contact with solids
Apparatus
Rotary drums or receptacles
Reexamination Certificate
active
06952888
ABSTRACT:
A dryer vacuum box suppresses occurrence of sticking at an exit portion of a dryer roll in a dryer part of a paper machine to prevent paper break in the dryer part of the paper machine upon high speed paper making. The dryer vacuum box is provided for applying a vacuum suction force generated by a vacuum source through a canvas to a paper web. A first vacuum box has an opening faced with a surrounding area of a peeling point on the canvas, where the canvas is separated from the circumferential surface of the dryer roll, and the opening is covered by the surrounding area of the canvas so that an enclosed space is defined within the first vacuum box. The first vacuum box is connected with the vacuum source so that the a degree of vacuum in the first vacuum box is set to a predetermined value.
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Nagano Akihito
Nagaoka Takashi
Gravini Stephen
Mitsubishi Heavy Industries Ltd.
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