CA2265087A1 - Method for cutting a leader and a tail in a web in a papermaking machine - Google Patents
Method for cutting a leader and a tail in a web in a papermaking machine Download PDFInfo
- Publication number
- CA2265087A1 CA2265087A1 CA 2265087 CA2265087A CA2265087A1 CA 2265087 A1 CA2265087 A1 CA 2265087A1 CA 2265087 CA2265087 CA 2265087 CA 2265087 A CA2265087 A CA 2265087A CA 2265087 A1 CA2265087 A1 CA 2265087A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- leader
- edge
- cutting apparatus
- water jet
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Abandoned
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Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H19/00—Changing the web roll
- B65H19/22—Changing the web roll in winding mechanisms or in connection with winding operations
- B65H19/26—Cutting-off the web running to the wound web roll
- B65H19/265—Cutting-off the web running to the wound web roll using a cutting member moving linearly in a plane parallel to the surface of the web and along a direction crossing the web
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- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21G—CALENDERS; ACCESSORIES FOR PAPER-MAKING MACHINES
- D21G9/00—Other accessories for paper-making machines
- D21G9/0063—Devices for threading a web tail through a paper-making machine
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65H—HANDLING THIN OR FILAMENTARY MATERIAL, e.g. SHEETS, WEBS, CABLES
- B65H2301/00—Handling processes for sheets or webs
- B65H2301/50—Auxiliary process performed during handling process
- B65H2301/51—Modifying a characteristic of handled material
- B65H2301/515—Cutting handled material
- B65H2301/5153—Details of cutting means
- B65H2301/51534—Water jet
Abstract
There is disclosed a method for forming a leader and a tail in a web of a papermaking machine that utilizes a water jet cutting apparatus having a nozzle.mounted for movement along a beam that extends transversally across the width of the web. The method includes the step of initially positioning the water jet nozzle at one end of the beam outside of the first edge and activating the nozzle to spray a liquid jet from the nozzle. Thereafter, a leader is formed in the web by moving the nozzle from the initial position to a predetermined position within the outside edge of the web at a chosen speed relative to the web travel speed. At this second predetermined position a slit is formed to form a tail. By choosing the relative speed a flatter edge or leader is formed to facilitate turn-up. The web is supported at the location of the cut into the edge of the web to reduce the risk of the web tearing. Also, the forming of this leader and tail in one operation reduces the apparatus hardware required to accomplish the formation of a tail and the cutting of a leader in two separate stations.
Description
METHOD FOR CUTTING A LEADER
AND A TAIL IN A WEB IN A PAPERMAKING MACHINE
Field of the Invention The present invention relates to a method for cutting a leader and lead-in strip into a web in a papermaking machine.
Backaround of the Invention s In the manufacture of paper, plastic film or similar materials, highly undesirable web breakage occasionally occurs during machine operation and also at machine start-up. The web breakage is highly undesirable because the web has to be rethreaded prior to continuing paper manufacture. This can result in manufacturing delays. Web breakage in papermaking machines is io even more undesirable because of the continuous running operation of these machines. In high-speed papermaking machines the paper continually moves through the machine at speeds up to 2000 meters/minute. Consequently, it is important for the rethreading of the web to be performed quickly and properly to reduce web wastage.
is In practice, after a web break, the web is threaded in stages through the papermaking machine by first slitting the web with a knife or water jet adjacent one edge of the web and then chopping the slitted web portion at a chopping station located downstream from the slitting knife in the direction of web travel. The chopping operation is either done manually by a person standing under the web with a knife or automatically by a knife that moves outwardly towards the,edge of the web away from the slit in the web. In some instances, the chopping is not performed and instead the tail is blown into threading ropes which tear the tail.
s The term tail used herein refers to the portion of the web formed between the continuous slit and the adjacent edge of the web adjacent. The tail may also be referred to as an "edge piece" or "lead-in strip" of the web.
The terms "leader" or "lead-in edge" as used herein refers to the chopped edge portion of the tail. The leader is formed at a separate tail chopping to station in the prior art.
The chopping of the tail to form the leader at a downstream station prevents the web from tearing across the remainder of the width of the web which may happen if the tail is blown into threaded ropes and torn. After successfully completion of the formation of the leader, the tail is threaded into Is the next section of the papermaking machine. Once the tail is threaded, the slitting knife is moved transversely across the web to cut the remainder of the web.
A tail cutting apparatus for forming a tail and subsequently manually chopping the tail to form a leader is disclosed in U.S. patents 5,234,549 zo issued August 10, 1993 to Scott Weldon and U.S. Patent 5,158,648 issued October 27, 1992 to Scott Weldon. In the tail formation as disclosed in U.S.
Patents 5,234,549, and 5,158,648, a second slitting knife is used in conjunction with the first slitting knife after the tail is chopped manually and then threaded to first move the threaded tail to the center of the web and 2s subsequently move the slitting knifes in opposite directions to sever opposite edges of the web. This form of slitting is known to reduce the risk of the web breaking.
Another tail formation similar to that disclosed in the afore-mentioned U.S. patents is disclosed in WO 98/33974 published August 6, 1998 to 3o Kuhasalo et al. In this publication, two water jet cutters are positioned on a beam to cut across the web. The first water jet cutter is positioned inside an edge of the web for cutting a first slit into the web. A second water jet cutter is moved slowly into the web from the outside edge of the web to form a sharp tip that may be transferred to a broke pit. The second water jet cutter moves s into the web at a relatively slow speed compared to the travel of the web so as to form a sharp tip. The sharp tip is cut in the direction of web travel so as not to form a notch into the web which would otherwise possibly result in web breakage. There is no disclosure as to how the tail portion is chopped to form the lead in edge or leader and in practice this tail is blown into threading ropes io and ripped to form a leader.
In view of the above, there exists a need for a method for cutting a leader and tail in one operation in a web of a papermaking machine that does not subject the web to breakage.
Summary of the Invention is The present invention relates to a method of forming a leader and a tail in a web in a papermaking machine utilizing a water jet cutting apparatus.
The water jet cutting apparatus is mounted to a beam that extends transversally across the width of the web. The water jet cutting apparatus is able to move across the width of the beam. The water jet cutting apparatus is 2o initially positioned outside the edge of the web. The water jet cutting apparatus is moved in from the initial position to cut into the edge of the web a predetermined distance to cut the leader into the web. Thereafter, the water jet cutting apparatus continues to operate cutting a slit in the web to form a tail adjacent this edge of the web. Once the tail is threaded into a threading nip located downstream of the water jet cutting apparatus, the water jet cutting apparatus traverses the beam to cut across the remaining portion of the web thereby severing the web. The present invention provides a method for cutting a leader and a tail in a web of papermaking machine in one operation or at one station.
3o The web is preferably supported where the initial cut into the edge of the web is made. Also, the web may be supported across the remaining width of the web. By supporting the web in this fashion, the web is held in place against the cutting forces associated with the liquid jet emanating from the water jet apparatus. It is within the realm of the present invention that the s support for the water jet apparatus may comprise a drum or cylinder in a calendar stack against which the water jet apparatus is directed as the web of paper passes over this drum. Alternatively, the support for the web may comprise a plate positioned beneath the web, a suction box associated with the nozzle that draws the web up against the suction box through which the io nozzle cuts, or some form of suction or negative pressure apparatus located in the bottom of the beam. It should be understood that the force of the water jet cutting into the edge of the web has a tendency to cause the edge to buckle. Consequently, the supporting of the web at the initial cut into the edge has the advantage of allowing the water jet cutter to move in from the is outside edge of the web with reduced risk of tearing the web.
Another aspect of the present invention involves the speed at which the water jet apparatus moves along the beam from the initial outbound position to the predetermined position where the water jet slits into the web to form the leader and tail. In accordance with this aspect of the invention, the water jet is 2o moved into the web at speeds relative to the speed of travel of the web to form a leader having a flattened or straight lead-in edge. This flattened edge forms an angle with the edge of the web that is 2.5° or larger. By creating a relatively flat leading edge, the tail has a leader is not a sharp tip and that facilitates turn-up or threading of the tail. It is also envisaged that in tail 2s cutting apparatus having two water jet cutters that the second water jet cutter can cut into the edge of the web to permit the formed tail to move into the center of the web prior to threading. In this instance the second water jet cutter may also cut into the web a manner similar to the manner in which the first water jet cutter cuts into the web thereby forming a second flat edge in the 3o web.
It should be understood that while reference throughout the disclosure and claims has been made to cutting a web in a papermaking machine, the web may be of a tissue ,paper or thicker board. Further, the relative speeds at which the water jet nozzle initially moves in from the edge position varies with the speed at which the paper is moving through the paper making s machine In accordance with one aspect of the present invention there is provided a method of forming a leader and a tail in a web in a papermaking machine utilizing a water jet cutting apparatus mounted for movement along a beam that extends transversely across the web a width that is greater than the io width of the web. The method comprises the steps of:
initially positioning the water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the water jet cutting apparatus to spray a liquid jet out from the apparatus;
is forming a leader in the web by moving the water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam; and, forming a tail extending from the leader generally parallel to the first 2o edge by temporarily stopping movement of the water jet cutting apparatus along the beam at a predetermined distance in from the first edge.
In accordance with another aspect of the present invention there is provided a method of forming a leader and a tail in a web in a papermaking machine utilizing first and second water jet cutting apparatus mounted for 2s movement along a beam that extends transversely across the web. The method comprises the steps of:
initially positioning the first and second water jet cutting apparatus over the web in-bound from a first edge of the web with the first water jet cutting apparatus positioned closer to the first edge than the second water jet cutting 3o apparatus;
activating the first and second water jet cutting apparatus to spray liquid jets prior cutting corresponding first and second slits into the web;
forming a flat leader in the web by moving the first water jet cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a s flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second water jet cutting apparatus io along the beam to move the tail across the web to a desired location.
Brief Description of The Drawings For a better understanding of the nature and objects of the present invention reference may be had to the accompanying diagrammatic drawings in which:
is Figures 1A and 1B are respectively initial and operating plan views illustrating the use of one water jet cutting apparatus in the method of the present invention;
Figure 2A, 2B, and 2C show various apparatus for supporting the web in the method of the present invention;
2o Figures 3A and 3B are respectively initial and operating plan views illustrating the use of two independently movable water jet cutting apparatus in the method of the present invention;
Figures 4A and 4B are respectively initial and operating plan views illustrating the use of two dependently movable water jet cutting apparatus in 2s the method of the present invention; and, Figures 5A and 5B are respectively initial and operating plan views illustrating the use of two independently movable water jet cutting apparatus in the method of the present invention to cut the leader in-bound of an outside edge of the web.
3o Detailed Description of the Drawings Referring to Figures 1 A and 1 B there is shown a water jet cutting apparatus 10 suitable for cutting a pattern 12 in the web 14 of a papermaking machine. The water jet cutting apparatus 10 includes a beam 16 which extends across the width of the web 14. The beam 1 ~ Iflrll If~PC a rarri~r,o , Q
on which is mounted a water jet cutting apparatus or nozzle 20. The carriage s 18 is adapted to move along the beam driven by a drive train 22.
In Figure 1A, the initial position of the water jet cutting nozzle 20 is shown. The nozzle 20 is located outside of a first edge 24 of the web 14. In this position, the water jet nozzle 20 is activated to direct a spray of liquid fluid down from the water jet cutting nozzles 20.
io Next, drive train 22 is actuated to move the water jet cutting nozzle 20 into the first edge 24 to cut a leader 26 to begin the cut pattern shown in Figure 1 B. Thereafter, for a predetermined amount of time the water jet cutting nozzle 20 is maintained in it's first predetermined position inbound from the edge 24 of the web to cut a slit 28 forming tail 29 used for threading is purposes. After the tail 29 is cut and threaded at a downstream station (not shown), the water jet nozzle 20 is moved across the web 14 to provide a cut as shown at 30 which eventually cuts across to the second edge 32 of the web 14 thereby severing the web (as illustratively shown by broken line 31 ).
It should be understood that the flat edge 26 makes an angle a greater 2o than or equal to 2.5° with the edge 24 of the web 14. The preferred range of the angle a, would be 2.5° to 20°. In order to make the a, angle, the water jet apparatus initially moves into the web at speeds relative to the speeds of movement of the web in the direction shown by arrow 34. The relative speeds of movement determines the angle a. Also, the web tail section 29 in practice 2s is longer than that shown in order to allow the web tail to move along the direction 34 of movement of the web 14 until the tail 29 reaches the threading or tun-up station. The tail 28 while shown to be relatively short may be in the order of 20 or 30 feet in length before the tail 29 is widened at 30 resulting in the remainder of the web 14 being severed.
3o Referring to figures 2A through 2C the beam 16 has the water jet cutting nozzles 20 located thereon. In each of these views, the web 14 is shown moving relative to the beam 16 and the water jet cutting nozzle 20. In Figure 2A, the water jet cutting nozzle 20 includes a suction box 42. The suction box 42 draws a suction to bring the web 14 into contact with the s relatively flat surface 44 of the suction box. As the paper web 14 is supported against the flat surface 44 of the suction box 42, a water jet spray is emitted through the suction box as shown at 46 to cut into the web 14. Such an apparatus is disclosed in more detail in my Canadian Patent Application Serial No. 2,243,771 filed July 23, 1998, and entitled "Water Jet Cutting Head".
to In Figure 2B, the water jet nozzle 20 is directed down towards the web 14. The web 14 is supported relative to the beam 16 by the beam 16 having a false bottom 50 through which a vacuum is drawn to support the paper against the beam 50.
In Figure 2C, the beam 16 is shown with the water jet cutter nozzle 20 is as the web 14 passes supported over a roll or cylinder 52. Figures 2A
through 2C show different methods of supporting the web 14 when cut by the water jet cutting apparatus 20. This support for the web 14 prevents the edge 24 of the web 14 from buckling and tearing as the water jet 20 moves in to cut the first edge 24 into the web 14.
2o Referring to Figures 3A and 3B there is shown another method of cutting a leader 26 and tail sections 29, 64 and 66 in a paper making machine.
In this method two carriages 18 and 19 are moveable by drive trains 22 along the beam 16 independently of each other. Each of the carriages 18 and 19 carries a respective water jet cutting nozzle 20 and 21.
2s In the start-up position shown in Figure 3A, the nozzles 20 and 21 are initially located outside the first edge 24 of the web 14. In the method shown, the first carriage 18 moves in the same manner as disclosed above with respect to Figure 1 B. However, after a predetermined time has passed, the second carriage 19 moves along the beam bringing water jet cutting nozzle 21 3o into contact with the first edge 24 of the web at point 59. The point 59 may be a relatively sharp tip as shown, or alternatively, the second water jet cutting nozzle 21 may move in at the same relative speed as the speed the first nozzle 20 is moved in to form another flat cut similar to that at flat edge 26.
Thereafter, the tail section 64 is formed between cuts 30, 60 and is moved across the width of the web 14 to a desired location as at 66. At the desired s location 66 the first carriage 19 is moved back towards the first edge 24 bringing the water jet cutter 21 to cut the pattern 64 back towards the first edge 24. Simultaneously, the carriage 18 is moved completely across the width of the web beyond edge 32 moving the water jet nozzle 20 beyond the edge 32 and thereby severing the web 14 (as shown by dotted line 31 ).
to Referring to Figures 4A and 4B, there is shown an apparatus for effecting the pattern of cut shown in these figures. The pattern of cut shown in these figures is substantially similar to that shown in Figure 3B, however the water jet nozzles 20 and 21 are carried by the same carriage 18. In this embodiment, the second water jet cutter 21 is turned off after it has returned is the edge trim cut 64 to the edge of the web 24. Figure 4A shows the initial position of the water jet cutting nozzles 20 and 21 to be outbound of the first edge of 24 of the web 14. For the most part, the operation of the water jet cutting apparatus to provide the pattern shown in Figure 4B is substantially the same as that described for Figure 3B.
2o Referring now to Figure 5A, the web cutting apparatus is similar to that shown if Figure 3A and 3B respectively. The water jet cutting apparatus are moved from the initial position as shown with the cutters 20 and 21 located outboard of first edge 24 of the web 14 to a position over the web where the first water jet nozzle 20 is positioned to begin to cut the first slit 100 2s down into the web 14. The second water jet cutter 21 is moved to the position to cut slit 102. Slit 100 is located closer to the first edge 24 than slit 102.
Once cutting of the slits commence, the first carriage 18 is accelerated relative to the beam in the direction traverse to the direction of movement 34 of the web 14. As a result, a flat leader edge 104 is cut by the water jet nozzle 120.
3o At this time both water jet nozzles 21 and 20 cut corresponding slits 110 and 112 to provide therebetween a tail 104. As the tail then moves into a threaded position downstream, the first carriage 18 moves towards the outside edge 32 to thereby widen the tail as shown at slit 116 so that the tail 116 eventually widens thereby moving right across to the second edge 32 of the web 14 to thereby sever the web. At the same time, the first tail or the first s edge or slit portion 112 of the tail associated with water jet nozzle 21 is moved back towards the first edge 24 as shown at 118 to thereby sever the slit associated with water jet nozzle 21 against the first edge 24.
It should be understood that for each of the methods shown for Figures 1A, 1B, 3A, 3B, 4A, 4B and 5A, 5B, local support of the web 14 when the io edge or leader is cut into the web facilitates the cutting process.
Further, the movement of the first cutter at a relatively high transverse speed to the direction of movement of the web 14 results in a relatively flat edge 26 which facilitates the threading of the tail into the threading ropes or nip located downstream.
is It is envisaged that alternatively, laser cutting devices could replace the water jet cutting nozzles and operate in the same manner as the water jet cutting nozzles. The lasers would be mounted to the carriage for movement along the beam and could be actuated to direct a laser beam or cutting medium towards the web surface.
2o It should be understood that alternative embodiments of the present invention may be readily apparent to a man skilled in the art in view of the above description for the preferred embodiments of this invention.
Accordingly, the scope of the present invention should not be limited to the teachings of the preferred embodiments and should be limited to the scope of 2s the claims that follow.
AND A TAIL IN A WEB IN A PAPERMAKING MACHINE
Field of the Invention The present invention relates to a method for cutting a leader and lead-in strip into a web in a papermaking machine.
Backaround of the Invention s In the manufacture of paper, plastic film or similar materials, highly undesirable web breakage occasionally occurs during machine operation and also at machine start-up. The web breakage is highly undesirable because the web has to be rethreaded prior to continuing paper manufacture. This can result in manufacturing delays. Web breakage in papermaking machines is io even more undesirable because of the continuous running operation of these machines. In high-speed papermaking machines the paper continually moves through the machine at speeds up to 2000 meters/minute. Consequently, it is important for the rethreading of the web to be performed quickly and properly to reduce web wastage.
is In practice, after a web break, the web is threaded in stages through the papermaking machine by first slitting the web with a knife or water jet adjacent one edge of the web and then chopping the slitted web portion at a chopping station located downstream from the slitting knife in the direction of web travel. The chopping operation is either done manually by a person standing under the web with a knife or automatically by a knife that moves outwardly towards the,edge of the web away from the slit in the web. In some instances, the chopping is not performed and instead the tail is blown into threading ropes which tear the tail.
s The term tail used herein refers to the portion of the web formed between the continuous slit and the adjacent edge of the web adjacent. The tail may also be referred to as an "edge piece" or "lead-in strip" of the web.
The terms "leader" or "lead-in edge" as used herein refers to the chopped edge portion of the tail. The leader is formed at a separate tail chopping to station in the prior art.
The chopping of the tail to form the leader at a downstream station prevents the web from tearing across the remainder of the width of the web which may happen if the tail is blown into threaded ropes and torn. After successfully completion of the formation of the leader, the tail is threaded into Is the next section of the papermaking machine. Once the tail is threaded, the slitting knife is moved transversely across the web to cut the remainder of the web.
A tail cutting apparatus for forming a tail and subsequently manually chopping the tail to form a leader is disclosed in U.S. patents 5,234,549 zo issued August 10, 1993 to Scott Weldon and U.S. Patent 5,158,648 issued October 27, 1992 to Scott Weldon. In the tail formation as disclosed in U.S.
Patents 5,234,549, and 5,158,648, a second slitting knife is used in conjunction with the first slitting knife after the tail is chopped manually and then threaded to first move the threaded tail to the center of the web and 2s subsequently move the slitting knifes in opposite directions to sever opposite edges of the web. This form of slitting is known to reduce the risk of the web breaking.
Another tail formation similar to that disclosed in the afore-mentioned U.S. patents is disclosed in WO 98/33974 published August 6, 1998 to 3o Kuhasalo et al. In this publication, two water jet cutters are positioned on a beam to cut across the web. The first water jet cutter is positioned inside an edge of the web for cutting a first slit into the web. A second water jet cutter is moved slowly into the web from the outside edge of the web to form a sharp tip that may be transferred to a broke pit. The second water jet cutter moves s into the web at a relatively slow speed compared to the travel of the web so as to form a sharp tip. The sharp tip is cut in the direction of web travel so as not to form a notch into the web which would otherwise possibly result in web breakage. There is no disclosure as to how the tail portion is chopped to form the lead in edge or leader and in practice this tail is blown into threading ropes io and ripped to form a leader.
In view of the above, there exists a need for a method for cutting a leader and tail in one operation in a web of a papermaking machine that does not subject the web to breakage.
Summary of the Invention is The present invention relates to a method of forming a leader and a tail in a web in a papermaking machine utilizing a water jet cutting apparatus.
The water jet cutting apparatus is mounted to a beam that extends transversally across the width of the web. The water jet cutting apparatus is able to move across the width of the beam. The water jet cutting apparatus is 2o initially positioned outside the edge of the web. The water jet cutting apparatus is moved in from the initial position to cut into the edge of the web a predetermined distance to cut the leader into the web. Thereafter, the water jet cutting apparatus continues to operate cutting a slit in the web to form a tail adjacent this edge of the web. Once the tail is threaded into a threading nip located downstream of the water jet cutting apparatus, the water jet cutting apparatus traverses the beam to cut across the remaining portion of the web thereby severing the web. The present invention provides a method for cutting a leader and a tail in a web of papermaking machine in one operation or at one station.
3o The web is preferably supported where the initial cut into the edge of the web is made. Also, the web may be supported across the remaining width of the web. By supporting the web in this fashion, the web is held in place against the cutting forces associated with the liquid jet emanating from the water jet apparatus. It is within the realm of the present invention that the s support for the water jet apparatus may comprise a drum or cylinder in a calendar stack against which the water jet apparatus is directed as the web of paper passes over this drum. Alternatively, the support for the web may comprise a plate positioned beneath the web, a suction box associated with the nozzle that draws the web up against the suction box through which the io nozzle cuts, or some form of suction or negative pressure apparatus located in the bottom of the beam. It should be understood that the force of the water jet cutting into the edge of the web has a tendency to cause the edge to buckle. Consequently, the supporting of the web at the initial cut into the edge has the advantage of allowing the water jet cutter to move in from the is outside edge of the web with reduced risk of tearing the web.
Another aspect of the present invention involves the speed at which the water jet apparatus moves along the beam from the initial outbound position to the predetermined position where the water jet slits into the web to form the leader and tail. In accordance with this aspect of the invention, the water jet is 2o moved into the web at speeds relative to the speed of travel of the web to form a leader having a flattened or straight lead-in edge. This flattened edge forms an angle with the edge of the web that is 2.5° or larger. By creating a relatively flat leading edge, the tail has a leader is not a sharp tip and that facilitates turn-up or threading of the tail. It is also envisaged that in tail 2s cutting apparatus having two water jet cutters that the second water jet cutter can cut into the edge of the web to permit the formed tail to move into the center of the web prior to threading. In this instance the second water jet cutter may also cut into the web a manner similar to the manner in which the first water jet cutter cuts into the web thereby forming a second flat edge in the 3o web.
It should be understood that while reference throughout the disclosure and claims has been made to cutting a web in a papermaking machine, the web may be of a tissue ,paper or thicker board. Further, the relative speeds at which the water jet nozzle initially moves in from the edge position varies with the speed at which the paper is moving through the paper making s machine In accordance with one aspect of the present invention there is provided a method of forming a leader and a tail in a web in a papermaking machine utilizing a water jet cutting apparatus mounted for movement along a beam that extends transversely across the web a width that is greater than the io width of the web. The method comprises the steps of:
initially positioning the water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the water jet cutting apparatus to spray a liquid jet out from the apparatus;
is forming a leader in the web by moving the water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam; and, forming a tail extending from the leader generally parallel to the first 2o edge by temporarily stopping movement of the water jet cutting apparatus along the beam at a predetermined distance in from the first edge.
In accordance with another aspect of the present invention there is provided a method of forming a leader and a tail in a web in a papermaking machine utilizing first and second water jet cutting apparatus mounted for 2s movement along a beam that extends transversely across the web. The method comprises the steps of:
initially positioning the first and second water jet cutting apparatus over the web in-bound from a first edge of the web with the first water jet cutting apparatus positioned closer to the first edge than the second water jet cutting 3o apparatus;
activating the first and second water jet cutting apparatus to spray liquid jets prior cutting corresponding first and second slits into the web;
forming a flat leader in the web by moving the first water jet cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a s flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second water jet cutting apparatus io along the beam to move the tail across the web to a desired location.
Brief Description of The Drawings For a better understanding of the nature and objects of the present invention reference may be had to the accompanying diagrammatic drawings in which:
is Figures 1A and 1B are respectively initial and operating plan views illustrating the use of one water jet cutting apparatus in the method of the present invention;
Figure 2A, 2B, and 2C show various apparatus for supporting the web in the method of the present invention;
2o Figures 3A and 3B are respectively initial and operating plan views illustrating the use of two independently movable water jet cutting apparatus in the method of the present invention;
Figures 4A and 4B are respectively initial and operating plan views illustrating the use of two dependently movable water jet cutting apparatus in 2s the method of the present invention; and, Figures 5A and 5B are respectively initial and operating plan views illustrating the use of two independently movable water jet cutting apparatus in the method of the present invention to cut the leader in-bound of an outside edge of the web.
3o Detailed Description of the Drawings Referring to Figures 1 A and 1 B there is shown a water jet cutting apparatus 10 suitable for cutting a pattern 12 in the web 14 of a papermaking machine. The water jet cutting apparatus 10 includes a beam 16 which extends across the width of the web 14. The beam 1 ~ Iflrll If~PC a rarri~r,o , Q
on which is mounted a water jet cutting apparatus or nozzle 20. The carriage s 18 is adapted to move along the beam driven by a drive train 22.
In Figure 1A, the initial position of the water jet cutting nozzle 20 is shown. The nozzle 20 is located outside of a first edge 24 of the web 14. In this position, the water jet nozzle 20 is activated to direct a spray of liquid fluid down from the water jet cutting nozzles 20.
io Next, drive train 22 is actuated to move the water jet cutting nozzle 20 into the first edge 24 to cut a leader 26 to begin the cut pattern shown in Figure 1 B. Thereafter, for a predetermined amount of time the water jet cutting nozzle 20 is maintained in it's first predetermined position inbound from the edge 24 of the web to cut a slit 28 forming tail 29 used for threading is purposes. After the tail 29 is cut and threaded at a downstream station (not shown), the water jet nozzle 20 is moved across the web 14 to provide a cut as shown at 30 which eventually cuts across to the second edge 32 of the web 14 thereby severing the web (as illustratively shown by broken line 31 ).
It should be understood that the flat edge 26 makes an angle a greater 2o than or equal to 2.5° with the edge 24 of the web 14. The preferred range of the angle a, would be 2.5° to 20°. In order to make the a, angle, the water jet apparatus initially moves into the web at speeds relative to the speeds of movement of the web in the direction shown by arrow 34. The relative speeds of movement determines the angle a. Also, the web tail section 29 in practice 2s is longer than that shown in order to allow the web tail to move along the direction 34 of movement of the web 14 until the tail 29 reaches the threading or tun-up station. The tail 28 while shown to be relatively short may be in the order of 20 or 30 feet in length before the tail 29 is widened at 30 resulting in the remainder of the web 14 being severed.
3o Referring to figures 2A through 2C the beam 16 has the water jet cutting nozzles 20 located thereon. In each of these views, the web 14 is shown moving relative to the beam 16 and the water jet cutting nozzle 20. In Figure 2A, the water jet cutting nozzle 20 includes a suction box 42. The suction box 42 draws a suction to bring the web 14 into contact with the s relatively flat surface 44 of the suction box. As the paper web 14 is supported against the flat surface 44 of the suction box 42, a water jet spray is emitted through the suction box as shown at 46 to cut into the web 14. Such an apparatus is disclosed in more detail in my Canadian Patent Application Serial No. 2,243,771 filed July 23, 1998, and entitled "Water Jet Cutting Head".
to In Figure 2B, the water jet nozzle 20 is directed down towards the web 14. The web 14 is supported relative to the beam 16 by the beam 16 having a false bottom 50 through which a vacuum is drawn to support the paper against the beam 50.
In Figure 2C, the beam 16 is shown with the water jet cutter nozzle 20 is as the web 14 passes supported over a roll or cylinder 52. Figures 2A
through 2C show different methods of supporting the web 14 when cut by the water jet cutting apparatus 20. This support for the web 14 prevents the edge 24 of the web 14 from buckling and tearing as the water jet 20 moves in to cut the first edge 24 into the web 14.
2o Referring to Figures 3A and 3B there is shown another method of cutting a leader 26 and tail sections 29, 64 and 66 in a paper making machine.
In this method two carriages 18 and 19 are moveable by drive trains 22 along the beam 16 independently of each other. Each of the carriages 18 and 19 carries a respective water jet cutting nozzle 20 and 21.
2s In the start-up position shown in Figure 3A, the nozzles 20 and 21 are initially located outside the first edge 24 of the web 14. In the method shown, the first carriage 18 moves in the same manner as disclosed above with respect to Figure 1 B. However, after a predetermined time has passed, the second carriage 19 moves along the beam bringing water jet cutting nozzle 21 3o into contact with the first edge 24 of the web at point 59. The point 59 may be a relatively sharp tip as shown, or alternatively, the second water jet cutting nozzle 21 may move in at the same relative speed as the speed the first nozzle 20 is moved in to form another flat cut similar to that at flat edge 26.
Thereafter, the tail section 64 is formed between cuts 30, 60 and is moved across the width of the web 14 to a desired location as at 66. At the desired s location 66 the first carriage 19 is moved back towards the first edge 24 bringing the water jet cutter 21 to cut the pattern 64 back towards the first edge 24. Simultaneously, the carriage 18 is moved completely across the width of the web beyond edge 32 moving the water jet nozzle 20 beyond the edge 32 and thereby severing the web 14 (as shown by dotted line 31 ).
to Referring to Figures 4A and 4B, there is shown an apparatus for effecting the pattern of cut shown in these figures. The pattern of cut shown in these figures is substantially similar to that shown in Figure 3B, however the water jet nozzles 20 and 21 are carried by the same carriage 18. In this embodiment, the second water jet cutter 21 is turned off after it has returned is the edge trim cut 64 to the edge of the web 24. Figure 4A shows the initial position of the water jet cutting nozzles 20 and 21 to be outbound of the first edge of 24 of the web 14. For the most part, the operation of the water jet cutting apparatus to provide the pattern shown in Figure 4B is substantially the same as that described for Figure 3B.
2o Referring now to Figure 5A, the web cutting apparatus is similar to that shown if Figure 3A and 3B respectively. The water jet cutting apparatus are moved from the initial position as shown with the cutters 20 and 21 located outboard of first edge 24 of the web 14 to a position over the web where the first water jet nozzle 20 is positioned to begin to cut the first slit 100 2s down into the web 14. The second water jet cutter 21 is moved to the position to cut slit 102. Slit 100 is located closer to the first edge 24 than slit 102.
Once cutting of the slits commence, the first carriage 18 is accelerated relative to the beam in the direction traverse to the direction of movement 34 of the web 14. As a result, a flat leader edge 104 is cut by the water jet nozzle 120.
3o At this time both water jet nozzles 21 and 20 cut corresponding slits 110 and 112 to provide therebetween a tail 104. As the tail then moves into a threaded position downstream, the first carriage 18 moves towards the outside edge 32 to thereby widen the tail as shown at slit 116 so that the tail 116 eventually widens thereby moving right across to the second edge 32 of the web 14 to thereby sever the web. At the same time, the first tail or the first s edge or slit portion 112 of the tail associated with water jet nozzle 21 is moved back towards the first edge 24 as shown at 118 to thereby sever the slit associated with water jet nozzle 21 against the first edge 24.
It should be understood that for each of the methods shown for Figures 1A, 1B, 3A, 3B, 4A, 4B and 5A, 5B, local support of the web 14 when the io edge or leader is cut into the web facilitates the cutting process.
Further, the movement of the first cutter at a relatively high transverse speed to the direction of movement of the web 14 results in a relatively flat edge 26 which facilitates the threading of the tail into the threading ropes or nip located downstream.
is It is envisaged that alternatively, laser cutting devices could replace the water jet cutting nozzles and operate in the same manner as the water jet cutting nozzles. The lasers would be mounted to the carriage for movement along the beam and could be actuated to direct a laser beam or cutting medium towards the web surface.
2o It should be understood that alternative embodiments of the present invention may be readily apparent to a man skilled in the art in view of the above description for the preferred embodiments of this invention.
Accordingly, the scope of the present invention should not be limited to the teachings of the preferred embodiments and should be limited to the scope of 2s the claims that follow.
Claims (23)
1. A method of forming a leader and a tail in a web in a papermaking machine utilizing a water jet cutting apparatus mounted for movement along a beam that extends transversely across the web a width that is greater than the width of the web, the method comprising the steps of:
initially positioning the water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the water jet cutting apparatus to spray a liquid jet out from the apparatus;
forming a leader in the web by moving the water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam; and, forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the water jet cutting apparatus along the beam at a predetermined distance in from the first edge.
initially positioning the water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the water jet cutting apparatus to spray a liquid jet out from the apparatus;
forming a leader in the web by moving the water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam; and, forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the water jet cutting apparatus along the beam at a predetermined distance in from the first edge.
2. The method of claim 1 wherein the web is travelling at a first predetermined speed in a machine direction and the step of forming the leader includes moving the water jet cutting apparatus along the beam in a direction transverse to the machine direction at speeds to form the leader with a flat edge.
3. The method of forming a leader and a tail in a web in a papermaking machine of claim 1 wherein the web is travelling at a first predetermined speed in a machine direction and the step of forming the leader includes moving the water jet cutting apparatus along the beam in a direction transverse to the machine direction at speeds relative to the first predetermined speed to cut a leader into the first edge of the web at angles greater than about 2.5 degrees.
4. The method of claim 1 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
5. The method of claim 2 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
6. The method of claim 3 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
7. The method of claim 1 further including the subsequent step of moving the water jet cutting apparatus across the web to and past a second edge of the web to severe the web.
8. A method of forming a leader and a tail in a web in a papermaking machine utilizing first and second water jet cutting apparatus mounted for movement along a beam that extends transversely across the web a width that is greater than the width of the web, the method comprising the steps of:
initially positioning the first and second water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the first and second water jet cutting apparatus to spray liquid jets prior to moving the first and second water jet cutting apparatus;
forming a leader in the web by moving the first water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam;
forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the second water jet cutting apparatus along the beam into the first edge and simultaneously moving the first water jet cutting apparatus away from the first edge to move the tail across the web to a desired location.
initially positioning the first and second water jet cutting apparatus at one end of the beam outside a first edge of the web;
activating the first and second water jet cutting apparatus to spray liquid jets prior to moving the first and second water jet cutting apparatus;
forming a leader in the web by moving the first water jet cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the water jet cutting apparatus moves along the beam;
forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the second water jet cutting apparatus along the beam into the first edge and simultaneously moving the first water jet cutting apparatus away from the first edge to move the tail across the web to a desired location.
9. The method of claim 8 further including moving the first water jet cutting apparatus along the beam to a second edge of the web and moving the second water jet cutting apparatus along the beam back to the first edge after the tail reaches the desired location to sever the web.
10. The method of claim 8 wherein the web is travelling at a first predetermined speed in a machine direction and the step of forming the leader includes moving the first water jet cutting apparatus along the beam in a direction transverse to the machine direction at speeds to form the leader with a flat edge.
11. The method of claim 8 wherein the web is travelling at a first predetermined speed in a machine direction and the step of forming the leader includes moving the first water jet cutting apparatus along the beam in a direction transverse to the machine direction at speeds relative to the first predetermined speed to cut a leader into the first edge of the web at angles greater than about 2.5 degrees.
12. The method of claim 8 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
13. The method of claim 10 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
14. The method of claim 11 further including the step of supporting the web adjacent the first where the leader is formed in the web during the step of forming a leader.
15. A method of forming a leader and a tail in a web in a papermaking machine utilizing first and second water jet cutting apparatus mounted for movement along a beam that extends transversely across the web, the method comprising the steps of:
initially positioning the first and second water jet cutting apparatus over the web in-bound from a first edge of the web with the first water jet cutting apparatus positioned closer to the first edge than the second water jet cutting apparatus;
activating the first and second water jet cutting apparatus to spray liquid jets prior cutting corresponding first and second slits into the web;
forming a flat leader in the web by moving the first water jet cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second water jet cutting apparatus along the beam to move the tail across the web to a desired location.
initially positioning the first and second water jet cutting apparatus over the web in-bound from a first edge of the web with the first water jet cutting apparatus positioned closer to the first edge than the second water jet cutting apparatus;
activating the first and second water jet cutting apparatus to spray liquid jets prior cutting corresponding first and second slits into the web;
forming a flat leader in the web by moving the first water jet cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first water jet cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second water jet cutting apparatus along the beam to move the tail across the web to a desired location.
16. The method of claim 15 further including moving the first water jet cutting apparatus along the beam to a second edge of the web and moving the second water jet cutting apparatus along the beam back to the first edge after the tail reaches the desired location to sever the web.
17. The method of claim 16 further including the step of supporting the web adjacent the first edge where the flat leader is formed in the web during the step of forming a leader.
18. The method of claim 16 further including the step of supporting the web adjacent the first edge where the flat leader is formed in the web during the step of forming a leader.
19. A method of forming a leader and a tail in a web in a papermaking machine utilizing a cutting apparatus mounted for movement along a beam that extends transversely across the web a width that is greater than the width of the web, the method comprising the steps of:
initially positioning the cutting apparatus at one end of the beam outside a first edge of the web;
activating the cutting apparatus to direct a cutting medium out from the apparatus;
forming a leader in the web by moving the cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the cutting apparatus moves along the beam;
and, forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the cutting apparatus along the beam at a predetermined distance in from the first edge.
initially positioning the cutting apparatus at one end of the beam outside a first edge of the web;
activating the cutting apparatus to direct a cutting medium out from the apparatus;
forming a leader in the web by moving the cutting apparatus along the beam into a cutting position relative to the web to cut into the first edge of the web and through the web as the cutting apparatus moves along the beam;
and, forming a tail extending from the leader generally parallel to the first edge by temporarily stopping movement of the cutting apparatus along the beam at a predetermined distance in from the first edge.
20. The method of claim 19 wherein the web is travelling at a first predetermined speed in a machine direction and the step of forming the leader includes moving the cutting apparatus along the beam in a direction transverse to the machine direction at speeds to form the leader with a flat edge.
21. The method of claim 19 further including the step of supporting the web adjacent the first edge where the leader is formed in the web during the step of forming a leader.
22. A method of forming a leader and a tail in a web in a papermaking machine utilizing first and second cutting apparatus mounted for movement along a beam that extends transversely across the web, the method comprising the steps of:
initially positioning the first and second cutting apparatus over the web in-bound from a first edge of the web with the first cutting apparatus positioned closer to the first edge than the second cutting apparatus;
activating the first and second cutting apparatus to direct cutting mediums out from the first and second apparatus to cut corresponding first and second slits into the web;
forming a flat leader in the web by moving the first cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second cutting apparatus along the beam to move the tail across the web to a desired location.
initially positioning the first and second cutting apparatus over the web in-bound from a first edge of the web with the first cutting apparatus positioned closer to the first edge than the second cutting apparatus;
activating the first and second cutting apparatus to direct cutting mediums out from the first and second apparatus to cut corresponding first and second slits into the web;
forming a flat leader in the web by moving the first cutting apparatus along the beam across the second slit at a first predetermined speed across the beam relative to the speed of movement of the web to cut a flat edge into the web across the second slit of the web;
forming a tail extending from the leader generally parallel to the first edge by stopping movement of the first cutting apparatus along the beam at a predetermined distance in from the first edge; and, subsequently moving the first and second cutting apparatus along the beam to move the tail across the web to a desired location.
23. The method of claim 22 further including the step of supporting the web adjacent the first edge where the flat leader is formed in the web during the step of forming a leader.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2265087 CA2265087A1 (en) | 1999-03-09 | 1999-03-09 | Method for cutting a leader and a tail in a web in a papermaking machine |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2265087 CA2265087A1 (en) | 1999-03-09 | 1999-03-09 | Method for cutting a leader and a tail in a web in a papermaking machine |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2265087A1 true CA2265087A1 (en) | 2000-09-09 |
Family
ID=29555329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2265087 Abandoned CA2265087A1 (en) | 1999-03-09 | 1999-03-09 | Method for cutting a leader and a tail in a web in a papermaking machine |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2265087A1 (en) |
Cited By (4)
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|---|---|---|---|---|
| WO2008125723A1 (en) | 2007-04-12 | 2008-10-23 | Metso Paper, Inc. | Reeling apparatus for fiber web and method of reeling fiber web |
| CN108203892A (en) * | 2016-12-20 | 2018-06-26 | 上海东冠纸业有限公司 | A kind of green technology for making paper paper injection water needle device |
| EP3521220A1 (en) * | 2018-02-06 | 2019-08-07 | Valmet Technologies Oy | A turn-up method and a turn-up device for a reel-up for reeling of fiber webs |
| CN110130138A (en) * | 2018-02-02 | 2019-08-16 | 上海东冠纸业有限公司 | A kind of paper for daily use paper machine water needle system |
-
1999
- 1999-03-09 CA CA 2265087 patent/CA2265087A1/en not_active Abandoned
Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2008125723A1 (en) | 2007-04-12 | 2008-10-23 | Metso Paper, Inc. | Reeling apparatus for fiber web and method of reeling fiber web |
| CN101663217B (en) * | 2007-04-12 | 2011-07-20 | 美卓造纸机械公司 | Reeling apparatus for fiber web and method of reeling fiber web |
| US8167229B2 (en) | 2007-04-12 | 2012-05-01 | Metso Paper, Inc. | Reeling apparatus for fiber web and method of reeling fiber web |
| CN108203892A (en) * | 2016-12-20 | 2018-06-26 | 上海东冠纸业有限公司 | A kind of green technology for making paper paper injection water needle device |
| CN108203892B (en) * | 2016-12-20 | 2023-11-07 | 上海东冠纸业有限公司 | Paper guiding water needle device for green papermaking |
| CN110130138A (en) * | 2018-02-02 | 2019-08-16 | 上海东冠纸业有限公司 | A kind of paper for daily use paper machine water needle system |
| EP3521220A1 (en) * | 2018-02-06 | 2019-08-07 | Valmet Technologies Oy | A turn-up method and a turn-up device for a reel-up for reeling of fiber webs |
| CN110116926A (en) * | 2018-02-06 | 2019-08-13 | 维美德技术有限公司 | Coiling machine for winding fiber web digs method and tip-up device |
| US10800628B2 (en) | 2018-02-06 | 2020-10-13 | Valmet Technologies Oy | Turn-up method and a turn-up device for a reel-up for reeling of fiber webs |
| CN110116926B (en) * | 2018-02-06 | 2021-03-02 | 维美德技术有限公司 | Turning-up method and turning-up device for a reel-up for winding a fibre web |
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