Turn-up method and a turn-up device for a reel-up for reeling of fiber webs

Abstract

In a turn-up method for 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 in relation to the web travelling direction (S). Two cuts (C1, C2) are formed by two water jet nozzles starting from the edges of the web (W) and moving to the web center where the cuts (C1, C2) cross or meet forming a V-shaped tail end (V1). After the cuts the movement of the water jet nozzles is stopped and after the return movement of the water jet nozzles, cutting is started again from the center toward the edges so that the web W is cut by two cuts (C3, C4) and a substantially V-shaped beginning end (V2) to the 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) there is formed one web reject part (R) with two substantially V-shaped cuts. A turn-up device for a reel-up for reeling of fiber webs has two water jet nozzles, in which the cutting by the water jet nozzles (10,12) may be stopped between cutting of a tail end (V1) and cutting of a beginning end (V2) for a selected time for forming only, wherein there is one reject part (R) in the turn-up and the cross-direction travel distance (L1, L2) of each nozzle is substantially shorter than the width (L) of the web (W).

Claims

1. A turn-up method in a reel-up for reeling of fiber webs, comprising the steps of: cutting in a reel-up, a fiber web travelling in a machine direction, wherein the fiber web defines a first machine direction edge and a second opposed machine direction edge; wherein the cutting is performed with a first water jet nozzle connected to a first source of cutting pressure and a second water jet nozzle connected to a second source of cutting pressure; wherein the first water jet nozzle forms a first cut, starting at the first machine direction edge, and the second water jet nozzle forms a second cut starting at the second opposed machine direction edge; moving the first water jet nozzle and the second water jet nozzle toward each other in a cross-machine direction with respect to the fiber web toward a center area of the fiber web, which center area is about equally spaced between the first and second machine direction edges; causing the first and second cuts to meet or cross at the center area of the fiber web to form a convex shaped tail end to the fiber web which comes to a point; after forming the convex shaped tail end of the fiber web, pausing the movement of the first and second water jet nozzles and pausing cutting with the first and second water jet nozzles long enough to prevent formation of more than one reject part of the fiber web; after pausing the first and second water jet nozzles and the cutting action of the first and second water jets, restarting the movement of the first and second water jet nozzles from the center area of the fiber web and the cutting action of the first and second water jet nozzles from the center area of the fiber web; and moving the water jet nozzles from the center area of the fiber web to one of the opposed machine direction edges of the fiber web so that the fiber web is cut by a third cut and a fourth cut to form a convex shaped beginning end of the fiber web which begins with a point and between the cuts for the tail end and the cuts for the beginning end forming only one reject part of the fiber web.

2. The turn-up method of claim 1 wherein the step of the first water jet nozzle forming the first cut begins outwardly of the fiber web or at the first machine direction edge; and wherein the step of the second water jet nozzle forming the second cut begins outwardly of the fiber web or at the second machine direction edge.

3. The turn-up method of claim 1 wherein after the step of pausing the movement of the first and second water jet nozzles and pausing cutting with the first and second water jets nozzles, the first water jet nozzle returns to the first machine direction edge, and the second water jet nozzle returns to the second opposed machine direction edge.

4. The turn-up method of claim 1 wherein during the step of pausing the movement of the first and second water jet nozzles and pausing cutting with the first and second water jet nozzles both the movement of the first and second jet nozzles are stopped, and the cutting of the first and second water jets nozzles are stopped, for 0.05-3 seconds.

5. The turn-up method of claim 4 wherein both the movement of the first and second jet nozzles are stopped, and the cutting of the first and second water jets nozzles are stopped, for 0.1-0.5 seconds.

6. The turn-up method of claim 1 further comprising the step of allowing the formed one reject part to detach or detaching the one reject part from the fiber web and drawing the reject part into a pulper of the reel-up.

7. The turn-up method of claim 1 further comprising the steps of: applying an adhesive to the tail end; and attaching the tail end to a complete parent roll reeled by the reel-up.

8. The turn-up method of claim 1 further comprising the steps of: applying an adhesive on the beginning end; and picking up and attaching the beginning end of the fiber web onto a new reeling shaft; and beginning reeling of a next parent roll by the reel-up on said new reeling shaft.

9. The method of claim 1 wherein the step of moving the water jet nozzles so that the fiber web is cut by a third cut and a fourth cut to form a convex shaped beginning end of the fiber web is carried out to cut a V-shaped beginning end of the fiber web, and wherein the step of causing the first and second cuts to meet or cross at the center area of the fiber web to form a convex shaped tail end to the fiber web is carried out to cut a V-shaped tail end to the fiber web.

10. A turn-up method in a reel-up for reeling of fiber webs, comprising the steps of: cutting, in a reel-up, a fiber web travelling in a machine direction, wherein the fiber web defines a first machine direction edge and a second opposed machine direction edge; wherein the cutting is performed with a first water jet and a second water jet; wherein the first water jet makes a first cut, starting at the first machine direction edge, and the second water jet makes a second cut starting at the second opposed machine direction edge; moving the first water jet and the second water jet toward each other in a cross-machine direction with respect to the fiber web toward a center area of the fiber web, which center area is about equally spaced between the first and second machine direction edges; causing the first and second cuts to meet or cross at the center area of the fiber web to form a convex shaped tail end to the fiber web which comes to a point; after forming the convex shaped tail end of the fiber web, turning off the first and second water jets long enough to prevent formation of more than one reject part of the fiber web; turning on the first and second water jets and returning the first and second water jets from the center area of the fiber web to the first and second machine direction edges of the fiber web so that the fiber web is cut by a third cut and a fourth cut to form a convex shaped beginning end of the fiber web which begins with a point and between the cuts for the tail end and the cuts for the beginning end forming only one reject part of the fiber web.

11. The turn-up method of claim 10 wherein the step of turning off the first and second water jets long enough to prevent formation of more than one reject part of the fiber web further comprises stopping movement of the first jet and the second jet for 0.05-3 seconds.

12. The turn-up method of claim 11 wherein movement of the first and second jet are stopped for 0.1-0.5 seconds.

13. The turn-up method of claim 10 further comprising the step of allowing the one reject part to detach or detaching the one reject part from the fiber web and drawing the reject part into a pulper of the reel-up.

14. The turn-up method of claim 10 further comprising the steps of: applying an adhesive to the tail end; and attaching the tail end to a complete parent roll reeled by the reel-up.

15. The turn-up method of claim 10 further comprising the steps of: applying an adhesive on the beginning end; and picking up and attaching the beginning end of the fiber web onto a new reeling shaft; and beginning reeling of a next parent roll by the reel-up on said new reeling shaft.

16. The method of claim 10 wherein the step of causing the first and second cuts to meet or cross at the center area of the fiber web to form a convex shaped tail end is carried out to cut a V-shaped tail end to the fiber web, and wherein the step of turning on the first and second water jets and returning the first and second water jets from the center area of the fiber web to the first and second machine direction edges of the fiber web so that the fiber web is cut by a third cut and a fourth cut to form a convex shaped beginning end of the fiber web is carried out to cut a V-shaped beginning end of the fiber web.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

(1) In the following the invention is described in more detail referring to the accompanying drawings.

(2) FIG. 1 is a schematic view of cut lines of the fiber web in cutting of the turn-up.

(3) FIGS. 2A-2D schematically show some examples of cutline patterns of the fiber web.

(4) 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

(5) 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.

(6) 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.

(7) 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.

(8) 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.

(9) 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.

(10) 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 0.5the width L of the fiber web+0.01 to 2 m, advantageously 0.5the 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.

(11) 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.