Patent ID: 8221589
Filing Date: 2012-07-17
Classification: D21G

Abstract:
1. A blade holder in a fiber web machine for detaching a web threading tail from a moving surface, comprising: a frame formed as a single one piece integral profile; a mechanical doctor blade removably mounted to the frame and defining a direction in which the doctor blade extends toward and engages the moving surface; portions of the frame forming a first integral air channel within the integral profile of the frame, the first integral air channel extending in the cross-direction, and a plurality of machine-directional blow-off blow channels extending from the first integral air channel and which are arranged to direct air substantially in the same direction in which the doctor blade extends, so as to generate blow-off blows which detach the web threading tail from the moving surface of the fiber web machine; a flow surface formed integral with the frame and extending in a direction away from the moving surface; and portions of the frame forming a second integral air channel extending in the cross-direction, and portions of the frame forming a plurality of machine-directional bores which form first trailing blow channels arranged to direct air in the same or substantially the same direction in which the flow surface extends so as to generate trailing blows for guiding the web threading tail relative to the flow surface.