Tail threading method and finishing device for paper
AssigneeMetso Paper, Inc.
InventorsJuha Laitio, Ismo Kallio, Veli-Pekka Koljonen
Life of this patent
Estimating the term…
Abstract
In the method for threading a tail (7) of a paper or board web through a paper or board machine or a section thereof, or through an aftertreatment machine for paper or board or a section thereof, the tail (7) is prevented from wandering onto the same line with a tail carrier means (8, 9), such as threading ropes, upstream of the draw point of the tail. The tail (7) is guided towards the centre line of the machine by subjecting the tail to an effect of force which tends to move the tail towards the centre line of the machine.
Claims8
A method for threading a tail of a paper or board web in a paper or board machine or in a aftertreatment machine for paper or board comprising the steps of:
- feeding a forward end of a tail that is narrower than a full-width paper or board web between two continuous threading means to provide a draw point of the tail;
- guiding the tail towards a center line of the machine by subjecting the tail that is running along side said continuous threading means, after the draw point, to an external centering force, said centering force being directed in a cross direction of the web for moving the tail towards a center line of the machine away from said continuous threading means.
A finishing device for a paper or board machine or an aftertreatment machine for paper or board comprising:
- a path for a paper or board web defining a running direction of the web through the finishing device or the aftertreatment machine;
- a threading apparatus comprising means for drawing a tail portion of the web from a draw point along said path;
- and
- means arranged, with respect to said running direction, in an upstream direction relative to said draw point at a location where said tail portion runs alongside said threading apparatus for guiding the tail in a cross direction of the web towards a center line of the machine and away from the threading apparatus.
Dependencies are inferred from the claim text.