Dryer vacuum box

摘要

The invention provides a dryer vacuum box which 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 vacuum suction force generated by a vacuum source through a canvas to a paper web and comprises a first vacuum box having an opening faced with surrounding area of a peeling point on the canvas, where the canvas is separated from the circumferential surface of the dryer roll, 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 a degree of vacuum in the first vacuum box is to be set to a predetermined value. <IMAGE>