Method and device for winding of fiber webs, especially of paper and board webs

摘要

A method and apparatus for winding fiber webs, particularly paper and board webs, in which partial web rolls (R1, R2) are wound in a winding device having at least two winding stations (21, 22), where partial webs (W1, W2) are guided to rolls (R1, R2) via a nip between a winding roll(s) (12, 41, 42) and the partial web rolls (R1, R2). The partial webs (W1, W2) are guided on the surface of the winding roll(s) (12, 41, 42) before entering the nips creating a wrap angle (A1, A2) on the winding drum(s) (12, 41, 42). The wrap angles (A1, A2) of the partial webs onto the surface of the winding roll (12, 41, 42) is at least 120° and the wrap angle ratio, i.e. the relation of the larger wrap angle to the smaller wrap angle, is at least 1 and at most 1.25.

主权项

1. A method for winding a paper or board web, comprising the steps of:
guiding the paper or board web from an unwinding station in between slitter blades which slit the web in a longitudinal direction into a first partial web and a second partial web; winding in a winding device at a first winding station, the first partial web into a first partial web roll; wherein the first partial web is guided to the first partial web roll via a first nip between a winding roll and the first partial web roll; wherein the first partial web is guided on a surface of the winding roll starting at a first position on the surface of the winding roll, and from the first position wraps the surface of the winding roll along a first wrap angle which is at least 120° before entering the first nip in the first winding station; winding in the winding device at a second winding station, the second partial web into a second partial web roll; wherein the second partial web is guided to the second partial web roll via a second nip between the winding roll and the second partial web roll; wherein the winding roll defines a wrapping direction, in which the first partial web and the second partial web are wrapped on the winding roll; wherein the second partial web is guided on the surface of the winding roll starting at a second position on the surface of the winding roll, and from the second position to wrap the surface of the winding roll along a second wrap angle which is at least 120° before entering the second nip in the second winding station; wherein the second position is separated in the wrapping direction from the first position; and wherein a ratio of the first wrap angle and the second wrap angle is at least 0.8 and at most 1.25.