Turn-up Device For a Reel-up Forming a Single Reject Part

Abstract

In a reel-up for reeling of fiber webs, a web travelling in direction (S) is cut by two water jet nozzles moving in a transverse direction. Two cuts (C1, C2) are formed by the nozzles starting from the web edges moving to the web center where the cuts (C1, C2) cross or meet forming a V-shaped tail end (V1). After the cuts nozzle movement is stopped and after the return of the nozzles, cutting is restarted from the center toward the edges so the web W is cut by two cuts (C3, C4) forming a substantially V-shaped beginning end (V2) and between the cuts (C1, C2) for the tail end (V1) and the cuts (C3, C4) for the beginning end (V2) there is formed one web reject part (R) with two substantially V-shaped cuts. Cross-direction travel distance (L1, L2) of each nozzle is substantially shorter than the web width.

Claims

1. A turn-up device for a reel-up for reeling a fiber web, comprising: a first water jet nozzle connected to a first source of cutting pressure; a second water jet nozzle connected to a second source of cutting pressure, wherein the first water jet nozzle and the second water jet nozzle are arranged to make a first cut of the fiber web from a first side of the fiber web and a second cut of the fiber web from a second opposed side of the fiber web toward a center area of the fiber web which is substantially equally spaced between the first side and the second side, the first cut and the second cut forming a substantially convex shaped tail of the fiber web, and the first water jet nozzle and the second water jet nozzle are arranged to make third and fourth cuts of the fiber web by returning from the center area to the first side of the fiber web and the second side of the fiber web to form a substantially convex shaped beginning of the fiber web, with a single reject part of the fiber web therebetween; wherein the first water jet nozzle and the second water jet nozzle are arranged to stop movement and cutting for a selected time between cutting the substantially convex shaped tail and cutting the substantially convex shaped beginning end of the fiber web so as to form the single reject part of the fiber web; and wherein the fiber web defines a width in a direction perpendicular to a travel direction of the fiber web, and the turn-up device for a reel-up is arranged so the first and second water jet nozzles in making the first, second, third and fourth cuts travel a distance in the width direction of the fiber web which is substantially shorter than the width of the fiber web.

2. The turn-up device of claim 1 wherein the travel distance of the first and second nozzles in making the first, second, third and fourth cuts is between and of the width of the fiber web.

3. The turn-up device according to claim 1 wherein the travel distance of the first and second water jet nozzles in making the first, second, third and fourth cuts is the width of the fiber web plus between 0.3-1.5 m.

4. The turn-up device of claim 1 further comprising a guide for guiding to a pulper of the reel-up the reject part detached from the fiber web, and wherein the guide is connected to at least one source of air flow and wherein the guide is arranged to guide the reject part detached from the fiber web to the pulper.

5. The turn-up device of claim 1 further comprising at least one adhesive application device for applying adhesive on the substantially convex shaped tail of the fiber web and on the substantially convex shaped beginning of the fiber web.

6. The turn-up device of claim 1 further comprising at least one pressure break valve, guide plate, or inlet to another water line, to stop cutting when the first and second water jet nozzles are arranged to stop movement.

7. The turn-up device of claim 1 further comprising an adhesive applicator positioned over the center area of the fiber web so as to apply adhesive to the fiber web.

8. A turn-up device for a reel-up for reeling of fiber webs comprising: a fiber web mounted for motion in a machine direction, the fiber web having a first edge and a second edge and therebetween a cross-machine width, the width having an imaginary center line which extends in the machine direction; a first water jet nozzle mounted for cross-machine movement to a first guide which allows travel of the first water jet nozzle from the first edge of the fiber web over the imaginary center line by 0.3 to 1 meters but not to the second edge; wherein a first source of cutting pressure is provided to the first water jet nozzle to form a first water jet; a second water jet nozzle mounted for cross-machine movement to a second guide which allows travel of the first water jet nozzle from the second edge of the fiber web over the imaginary center line by 0.3 to 1 meters but not to the first edge; wherein a second source of cutting pressure is provided to the second water jet nozzle to form a second water jet; an adhesive applicator mounted over the imaginary center line for applying adhesive on a tail end to attach the tail end onto a finished parent roll and on a beginning end to attach the beginning end onto a reeling shaft; a turn-up control means controlling the turn-up and reeling of the reel up and further functionally connected to a control and actuating means controlling the application of adhesive with the adhesive applicator; and wherein the turn-up control means is functionally connected to a control and actuation means which controls the movement, starting and stopping of waterflow to cause a first and second cutting of the first water jet and the second water jet so as to form the tail end into a convex shape and the beginning end into a convex shape with a single reject part therebetween which is detached so as to be drawn into a pulper.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In the following the invention is described in more detail referring to the accompanying drawings.

[0030] FIG. 1 is a schematic view of cut lines of the fiber web in cutting of the turn-up.

[0031] FIGS. 2A-2D schematically show some examples of cutline patterns of the fiber web.

[0032] FIG. 3 schematically shows an advantageous example of a turn-up device for a reel-up for reeling of fiber webs according to the invention.

DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0033] During the course of the following description like numbers and signs will be used to identify like elements according to the different views which illustrate the invention and its advantageous examples. In the figures some repetitive reference signs have been omitted for clarity reasons.

[0034] In FIG. 1 schematically shows a fiber web travelling in direction S, i.e., the machine direction. Cutting of the web is carried out by means of two water jet nozzles moving in a transverse or a cross-machine direction in relation to the travelling i.e., machine direction S, of the fiber web W. The water jet nozzles start their movement from the edges of the fiber web W and move toward the imaginary center line M of the fiber web W and cutting pressure from a source of cutting pressure is provided to the water jet nozzles i.e., to form a water jet, and two cuts C1, C2 to the fiber web are formed, which cuts C1, C2 sever the fiber web W in the cross-direction of the fiber web. i.e. in a transverse direction in relation to the travelling direction S of the fiber web W. At the area of the imaginary center line of the fiber web W the cuts C1, C2 cross or reach or meet each other and a V-shaped tail end V1 to the fiber web W is formed as the fiber web W is severed in the cross-direction. Advantageously adhesive A1 is applied onto the fiber web W at least partially covering the tip area of the tail end V1 and the tail end V1 will be attached onto a complete parent roll by the fiber-web-applied adhesive A1. After the cuts C1, C2 of the tail end V1 of the fiber web W are finished, the cutting by the water jet nozzles is stopped and the movement of the water jet nozzles is stopped and the cutting is stopped for a determined time, for example 0.05-3 seconds, advantageously for 0.1-0.5 seconds, during which time water inlet into the water jet nozzles is stopped, i.e. no cutting pressure is applied to the water jet nozzles, so that no cut to the fiber web is formed. The selected time depends for example on the speed of the fiber web W and on the width of the fiber web W and on the cutting speed of the water jet nozzles. After the stopping, the cutting by the water jet nozzles is started again from the area of the imaginary center line M of the fiber web W and the water jet nozzles are moved by return movement toward the edges of the fiber web W and cutting pressure is applied so that the fiber web W is severed in the cross direction by two cuts C3, C4 and a V-shaped beginning end V2 to the fiber web W is formed and adhesive A2 is applied onto the fiber web W at least partially covering the tip area of the beginning end V2. The beginning end V2 of the fiber web W is picked-up and attached by the adhesive A2 onto a new reeling shaft, around which reeling of a next parent roll is begun. Between the cuts C1, C2 for the tail end V1 and the cuts C3, C4 for the beginning end V2 a part of the fiber web W, called the reject part R of the fiber web W, is formed. This reject part R detaches or is detached from the fiber web W and is drawn into a pulper of the reel-up for example by suction or by guiding air flows. The adhesives A1, A2 for attaching the tail end and the beginning end can be glue, tape or a corresponding adhesive.

[0035] The adhesive A1, A2 can be applied as an adhesive area or adhesive stripe and it covers at least partially the tip area of the tail end V1 and the tip area of the beginning end V2. The adhesive A1, A2 can also be applied as an adhesive stripe following the corresponding cut line C1, C2 at a desired distance from the cut C1, C2, as known as such to one skilled in the art. The travel distance of each water jet nozzle in the cross-direction is substantially shorter than the width L of the fiber web W. The center area of the fiber web W is the area substantially in the vicinity of the imaginary center line M extending longitudinally in the travelling direction S of the fiber web W. The fiber web travelling in the direction S is cut by two water jet nozzles moving substantially in a transverse direction in relation to the travelling direction S of the fiber web W. Two cuts C1, C2 are formed by two water jet nozzles starting their movement from the edges of the fiber web W and moving toward the center of the fiber web W and at the center area of the fiber web W the cuts C1, C2 cross or meet each other and a substantially V-shaped tail end V1 to the fiber web W is formed, after the cuts C1, C2 of the tail end V1 of the fiber web W are finished the cutting by the water jet nozzles is stopped and after the stop the cutting by the water jet nozzles is started again from the center area of the fiber web W and the water jet nozzles are moved by return movement toward the edges of the fiber web so that the fiber web W is cut by two cuts C3, C4 and a substantially V-shaped beginning end V2 to the fiber web W is formed and between the cuts C1, C2 for the tail end V1 and the cuts C3, C4 for the beginning end V2 one reject part R of the fiber web W with two substantially V-shaped cuts is formed as the fiber web is severed at two locations by tail-end cuts C1, C2 and by beginning end cuts C3, C4.

[0036] In FIGS. 2A-2D are shown examples of some cut line patterns, in which the fiber web travelling in direction S is cut by means of two water jet nozzles moving substantially in a transverse direction i.e., a cross-machine direction, in relation to the travelling direction S, i.e., the machine direction of the fiber web W. Two cuts C1, C2 are formed by two water jet nozzles starting their movement from edges of the fiber web W and moving toward the center of the fiber web W and at the center area of the fiber web W the cuts C1, C2 cross or meet each other and a substantially V-shaped tail end V1 to the fiber web W is formed, after the cuts C1, C2 of the tail end V1 of the fiber web W are finished, the cutting by the water jet nozzles is stopped and after the stop the cutting by the water jet nozzles is started again from the center area of the fiber web W and the water jet nozzles are moved toward the edges of the fiber web so that the fiber web W is cut by two cuts C3, C4 and a substantially V-shaped beginning end V2 to the fiber web W is formed and between the cuts C1, C2 for the tail end V1 and the cuts C3, C4 for the beginning end V2 one reject part R of the fiber web W with two substantially V-shaped cuts is formed as the fiber web is severed at two locations by tail-end cuts C1, C2 and by beginning end cuts C3, C4. As can be seen from FIG. 1 the cuts C1, C2, C3, C4 can extend as straight lines but other line patterns are also possible to create the substantially V-shaped cuts as shown in the examples of FIGS. 2A-2D. The cuts C1, C2, C3, C4 can extend as different curved lines that cross or meet each other in the center area of the fiber web. The center area of the fiber web W is the area which is substantially in the vicinity of the imaginary center line M extending longitudinally in the travelling direction S of the fiber web W. Other cut patterns are also possible, for example cuts formed of straight lines forming a broken line pattern. Also, it should be noted that the cut line pattern for one cut line need not to be similar to other cut lines i.e. one or more of the cuts C1, C2, C3, C4 can form a different line pattern from the other cut lines C1, C2, C3, C4.

[0037] In FIG. 3 is schematically shown an advantageous example of a turn-up device for a reel-up for reeling of fiber webs W. The turn-up device for a reel-up for reeling of fiber webs comprises two water jet nozzles 10, 12 movably attached in guides 11, 13 in the cross-direction of the fiber web, which first cut the tail-end V1 by cutting movement from the edge toward the imaginary center line of the fiber web M and then the cutting and the movement of the water jet nozzles 10, 12 is stopped and after the stop the beginning end V2 of the fiber web W is cut by the return movement of the corresponding water jet nozzle 10, 12 from the center line area toward the two edges of the fiber web W. The turn-up device also comprises means 14 such as valves to stop the cutting by stopping the flow of water to the water jet nozzles between cutting of a tail end V1 and cutting of a beginning end V2 for a selected time so forming only one reject part R in the turn-up and such that the travel distance L10, L12 of each nozzle in the cross-direction of the fiber web W is substantially shorter than the width L of the fiber web. The means 14 to stop the cutting by the water jet nozzles 10, 12 thus comprises control and actuating means 14, such as valves, for the water jet nozzles 10, 12.

[0038] The turn-up device also comprises an adhesive applicator 15 for applying adhesive on the tail end V1 to attach the tail end V1 onto the finished parent roll and on the beginning end V2 to attach the beginning end onto the reeling shaft. The adhesive applicator 15 is functionally connected to the control and actuating means 16 such as valves or tape cutters for the adhesive applicator 15. The control and actuating means 14 or valves of the water jet nozzles 10, 12 and the control and actuating means 16 such as valves or adhesive tape cutters for the adhesive applicator 15 can be functionally connected to a turn-up control means 18 such as an electrical, pneumatic, hydraulic, or mechanical devices controlling the turn-up and reeling of the reel up. The travel distance L10, L12 of each nozzle 10, 12, correspondingly, is 0.5 the width L of the fiber web+0.01 to 2 m, advantageously 0.5 the width L of the fiber web+0.3 to 1 m. The turn-up device also comprises means to guide the reject part R detached from the fiber web W into a pulper of the reel-up (not shown). The means 14 to stop the cutting by the water jet nozzles 10, 12 between cutting of the tail end V1 and cutting of the beginning end V2 stop water inlet of the nozzles 10, 12 for a selected time. The means 14 to stop water inlet of the nozzle comprise at least one pressure break valve or at least one mechanical means or at least one means to change the direction of cutting of the nozzle.

[0039] Above the invention has been described by referring to an advantageous example only to which the invention is not to be narrowly limited. Many modifications and alterations are possible within the inventive idea.