CA2031802A1 - Jet cutting apparatus for thin web materials and method of cutting - Google Patents
Jet cutting apparatus for thin web materials and method of cuttingInfo
- Publication number
- CA2031802A1 CA2031802A1 CA 2031802 CA2031802A CA2031802A1 CA 2031802 A1 CA2031802 A1 CA 2031802A1 CA 2031802 CA2031802 CA 2031802 CA 2031802 A CA2031802 A CA 2031802A CA 2031802 A1 CA2031802 A1 CA 2031802A1
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- CA
- Canada
- Prior art keywords
- web
- jet
- fluid
- cutting
- intensifier
- 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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Abstract
ABSTRACT
Apparatus for cutting a moving web of thin material, passing around upstream and downstream rolls and having a conveyor and a carriage movable on the conveyor, a fluid pressure intensifier mounted on the carriage so that the intensifier may be moved and stopped relative to the web, flexible jet fluid supply conduits connected to the intensifier fox supplying a jet fluid, flexible power fluid conduits connected to the intensifier for supplying power fluid, operation of the intensifier means by the power fluid intensifying the pressure of the jet fluid, and, a jet nozzle rigidly connected to the intensifier and located at a point closely overlying the web, and a jet nozzle housing for withdrawing air from between the nozzle and the web, and a method of jet cutting thin web material.
Apparatus for cutting a moving web of thin material, passing around upstream and downstream rolls and having a conveyor and a carriage movable on the conveyor, a fluid pressure intensifier mounted on the carriage so that the intensifier may be moved and stopped relative to the web, flexible jet fluid supply conduits connected to the intensifier fox supplying a jet fluid, flexible power fluid conduits connected to the intensifier for supplying power fluid, operation of the intensifier means by the power fluid intensifying the pressure of the jet fluid, and, a jet nozzle rigidly connected to the intensifier and located at a point closely overlying the web, and a jet nozzle housing for withdrawing air from between the nozzle and the web, and a method of jet cutting thin web material.
Description
2~31~2 The invention relates to cutting apparatus for cuttiny thin web materials, and in particular, to a cutter for cutting a web of paper moving at high speed, and a method of cutting this web mat:erial.
BACKGROUND OF THE INVENTION
The cutting of paper during manufacture in a paper making machine presents a series of problems. The web of paper will be moving through the machine at high speeds, and cuts may be required which are longitudinal and also more importantly which are diagonal to the axis of the web.
During the manufacture of paper, the wet fibre sheet (pulp or paper) is fed around drying rollers or dryers, by means of blankets which squeeze the paper/pulp on to the dryers. The dryers are heated, and the pulp is rapidly dried. There may be a multitude of such drying rolls and webs in the machine, and it is necessary to run the machine ~ontinuously without stopping, as long as there is ~ibre being fed from the upstream end. The web of paper becomes - progressively longPr, as it passes from the upstream end to the downstream end of the line, and thus the dryers must be run progressively faster and faster, from the upstream end to the downstream end.
At the downstream end, the dried paper web which is then moving at high speed is then fed onto a stack of vertical rolls known as a calender (not shown) and from there to a wind-up station or reel to form rolls of paper around reel bars (not shown). The rolls are. then removed for finishing and delivery to customers.
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It is well known that the web o~ paper at the downstream end, just prior to the calender and reel is fragile, and in practice breakages in the web before, or at -this point are relatively frequent.
The web, which may for example be thirty feet wida, must then be, as it were, re--threaded onto the calender stack and re-threaded again onto the reel.
With a full width web, this is simply impractical.
In fact, the practice is to cut what is called a "tail"
which may be about three inches wide, on one side of the web, and the tail is then re-threaded, typically for example by an air blast, into the afor~mentioned calender and reel sections (the downstream wind-up rolls). The tail will then carry the rest of the web on its desired path.
The web will usually break between the last of the dryers, and the aforementioned wind-up sections of the line. Accordingly, the tail ut may be made one or two dry~rs back up the line from its downstream end, at a position where the web of paper is still securely stretched between two sets of dryers. The cutting of this tail, first of ~11 involves the making of a first longitudinal cut parallel to the edge of the web to create the tail, and then a second transverse cut back over to the first edge o~
the webO
These cuts are, of course, made while the web is still moving at high speed and con equently, the transverse cut, in fact, produces a cut which is diagonal to the axis of the web.
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.: , . ~ . .: ' ,. , ' .~ " ~ ' : '. , ' 20'~1~0?, In the past, this has been done b~ various mechanical devices such as fixed knife blades, and rotating knif0 blades and the like. carriages have been provided to move the knife blades from one sid~e of the web to the other and back again in various ways. These solutions however have not been entirely satisfactory. A principal problem is the fact that paper is a relatively abrasive material, and when a knife blade is held in a web of paper moving at high speed it rapidly becomes dull. The tail cutting operation may have to be performed several times in a single shift, and the kni~e used must be re-sharpened between each cutting operation, in order to maintain continuity of production.
Howev~r, any knife blade whether fixed or rotary is inherently unsuitable for making a diagonal cut in a moving web of paper. Since the knife blade must be held with its edge lying along the longitudinal axis of the web, then when the knife blade is moved sideways transversely, the side surface of the blade will be pressed against the web and it will tend to tear rather than cut. This problem is, of course, greatly aggravated when using a rotary knife blade, since it presents, relatively speaking, a far greater width, when moved transversely across the moving web o~ paper than a ~ixed knife blade.
It is highly desirable to provide some form of cutting method having a device which produces a point cut pre~erably without mechanical contact, so that when the device is moved transversely, it does not present a side :' ' . ~ ~ . ' ' .
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In th~ past, high pre~sure jet cutting d~vices have been used in other applications. However these jet devices have never been successfully applied to tail-cutting4 One of the problems is that it i5 necessary to traverse the cutting device over a distance of thirty feet or more, i.e., the width of the web. llhe space where the cutting device must be traversed is located between two sets of dryers in the line and spac~ i5 relatively limited. In the past, most known jet cutting systems developed the high pressure jet cutting fluid at a location to one side of the machine, and then ~ed the high pressure fluid to a nozzle, by means of rigid high pressure hoses. Hoses capable of handling these high pressures and temperatures were, generally speaking, too rigid and massive and were unsuitable for this type of application. In addition ~elatively large line losses were encountered leading to substantial inefficiencies.
There are other applications in the paper-making industry as well as in other industries, where jet cutting devices are used as slitters, making straight longitudinal cuts along the web axis. The systsms, of course, do not encounter the type of problems described above. Nozzles may be placed in a fixed location. High pressure fluid may be supplied to the nozzles by suitable rigid metallic ;~;! plping, and a high pressure source such as a pump or intensifier may be located to one side of the machine, in a fixed location. Such systems were however incapable of :' , .. . . .
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The particular operation described above, namely the cutting of a tail on a moving web of paper, presents these - various problems in a particularly acute form. However, -: generally.similar problems occur in the paper-making industry, or in any other web processing industry, in any :
; situation where it is attempted to cut a web moving at high speed, wherein the cutting device moves diagonal to the web axis. The invention is not to be confined solely to the ~ cutting of a tail for re-threading purposes, but is of .; application to any situation where it is desired to form a : diagonal cut or cuts in a web of material moving at high speed.
~; BRIEF SUMMARY OF THE INVENTION
With a view to solving the various problems noted above, the invention provides an apparatus for cutting a moving web of thin material, said web passing around , .
upstream and downstream rolls adjacent to one another, said apparatus comprising conveyor means adapted to be .~: positionDd between said upstream and downstream rolls, carriage means movably mounted on saicl conveyor means and adapted to be moved therealong, and power-operated .~ movement means for moving the same, pressure intensifier means mount:e~cl on said carriage means, whereby said intensifier means may be moved by said carriage means relative to said web, flexible jet fluid supply conduit means connected to said intensifi~r means for supplying a '' . ' : , , ' ~ ' ` ~ . ':
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jet fluid thereto at a predetermilled first pressure, flexible power conduit means connected to said intensifier means for supplying a power fluid thereto at a predetermined second pressure, operation of said intensifi2r means by said power fluid intensifying the pressure of said jet fluid from said first pressur~ to a predetermined third pressure, and jet nozzle means connected to said intensifier means, and located at a point closely overlying said web, and adapted to discharge said jet fluid at said predetermined third pressure, whereby to cut said web.
More particularly, it is an objective o~ the invention to provide an apparatus having the foregoing advantages, and including elongated housing means defining a top wall, a rear wall, and a bottom wall, and wherein said conveyor rail means are mounted on said top and bottom ~r walls, and wherein said jet fluid supply hose means and said power ~luid power hose means are located within said housing means.
More particularly, it is an objective of the invention to provide an apparatus having the ~oregoing advantages, and including an elongated flexible hose support means located within said housing means, and wherein said jet fluid supply hose means and said power hose means are located within said flexible hose support means, ~or movement in response to movement o~
said carriage means.
More particularly, it i5 an objective o~ the .
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~'3:1~02 invention to provide an apparatus hav:ing the ~oregoing advantages wherein said flexible hose support means is secured approximately mid-way between the ends of said housing means, on said bottom wall thereof, and wherein said flexible hose support means extends along said botto~
wall, and upwardly towards sa:id top wall, and defines lower and upper support portions, spaced apart from one another, and a U-shaped bend portion extending therebetween.
More particularly, it is an objective of the invention to provide an apparatus having the foregoing advantages, and including carriage movement means, connected to said carriage means, control guide means at either end of said conveyor means, around which said carriage drive means is guided, power operated means for - moving said carriage drive means, whereby to move said carriage means ~rom along said conveyor means in both -; directions, and carriage drive support means on said carriage means, engageable with said carriage drive means, whereby to support the same intermediate said carriage guide means.
~ Xt is a further and related sbjective of the ;~ invention to provide an apparatus having the foregoing advantages and further including plate means located ~; adjacent to said jet nozzle means, and oriented at a predetermined angle, whereby ts lie closely adjacent to said web, and including openings in said plate means and suction means adapted to withdraw air from the space between said web and said plate means.
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2031~3~2 The v~rious features of novelty which characterize the invention are poi.nted out with more particularity in the claims annexed to and ~orming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
IN THE DRAWINGS
Figure 1 is a perspective illustration partially cut away, of upstream and downstream dryer rolls, carrying a ~ web, with the jet cutting apparatus of the invention, shown -~ positioned between the two rolls;
Figure 2 is a section along the line 2-2 of Figure 1;
Figure 3 is a front elevational view of the apparatus i .of Figure 1I with portions omitted for the sake of clarity, :.
-'~ and showing a portion of the apparatus in a first or retracted position;
-. 20 Figure 4 is a front elevational view corresponding to Figure 1 showing a portion of the apparatus with the carriage in a second or extended position;
Figure 5 is a perspective illustration of the intensifier portion of the apparatus;
Figure 6 is a perspective illustration of an alternate embodiment o the invention showin~ a modified form of the plate portion and jet nozzle of the intensifier, and, . ~
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l g ~ 2 Figur~ 7 is a schema-tic plan view o~ a web of paper showing the cuts made by the invention.
- DESCRIPTION OF A SPECIF'IC EMB5)DIMEMT
As described above, the invention relates generally to the cutting o~ thin web mat:erial, and in particular, to the cutting o~ such thin web materials which are in motion at high speed such as thin paper webs in paper making machines.
The particular embodiment illustrated is designed and intended for the cutting of what is called a "tail" on a web o~ paper moving at high speed through successive dryer rolls in a paper making machine.
While it is not necessary ~or the purposes of this description to describe all of the features of a paper making machine, essentially, a paper making machine consists o~ a large number of rolls, some of which are heated for the purposes of drying the fibre. The fibre is .
pressed against the rolls by a series of endless belts or blankets. The rolls may be of considerable width, up to thirty feet or more in many cases.
As the paper pulp moves from the upstream end to the downstream end o~ the line of rolls, it progressively dries out and becomes thinner and longer. Thus, the downstream dryer rolls will be rotating at a much greater speed than the upstream rolls, and in fact, the velocity o~ the web around the last two or three dryer rolls may reach several thousand feet per minute. As the paper web exits from the last drying roll, it then passes to a calender and reel "
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2~1%~2 section.
During operation, it is well known that the web of paper may become broksn or torn, often between the last drying roll and the aforementioned calender and reel sections, and in fact, this may happen several times per day.
Due to its width, it is impractical to re-thread the torn end of the web directly into the calender and reel section. The practice for many years has been to cut the web between two of the drying rolls upstream of the end of the line, to provide what is called a "tail." A tail is a strip of the web approximately three inches wide along ~,',7 one edge of the web. This was done by making a cut with an implement such as a knife. The knife blade must be held stationary about three inches from one edge of the web while the tail is cut. Then the knife blade must be moved back across the web, to the other edge of the web. Since ; the web is of course moving during this cutting operation, the end result will be a single longitudinal cut parallel to one edge, and a second diagonal cut across the web to the other edge.
The tail is then more readily fed onto the calender and reel section, usually by means of an air blast, and the web will then re-thread itself through the calender and reel stations.
During this operation, the major portion of the web . . .
` o* paper between the last roll and the calender and reel section is simply discarded and in fact, is returned ` -10-, , , . . , ~ :
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~;; , ' : ' 203~02 to the upstream end of the line and reprocessed as pulp.
Referring now to Fiyure 1, the invention is there illustrated, being located between two dryer rolls of a conventional paper making machine. The two rolls are indicated as R1 and R2; R2 being downstream from R1. The web of paper is passing from roll R1 upwardly, around roll R2, in the direction of the arrow "a".
The entire device may also be located such, that it would be positioned between roll R1 and previous upstream roll (not shown), with the paper running in a downward direction. The autting apparatus in accordance with the invention is indicated by the general reference 10, and ~ comprises an elongated hollow support bar 12, and a - carriage 14.
Hydraulic power is provided by means of th~
power fluid pump 16 driven, for example, by a prime mover :~
such as electri¢al motor 18.
~ A pressure intensifier 20, is mounted on the carriage ; 14, and develops a high pressure water jet at the nozzle indicated generally as 22.
Referring now to Figures 2, 3 and 4~ the support bar 12 will be seen to comprise upper and lower elongated plate members 30 and 32, a back wall 34 (Figure 1), and an intermediate wall 36. The upper and lower walls, and the ` re~r wall and intermediate wall, together, form a hollow box section o~ great rigidity, adapted to provide a solid .: support for the device across the entire width of the web.
Suitable mounting means (not shown) will be connected to :' -:
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2 ~ 2 the bar 12 for mountiny at either end on appropriate support structure (not shown).
Conveyor means are provided in the form of upper and lower conveyor rails 38 and 40, formed alony the free edges of upper and lower walls 30 and 32. A generally "U" shaped channel member having walls 42, 44 and 46, is attached to intermediate wall 36, and extends approximately one half the length of the support bar 12, for reasons to be described below.
The carriage means 14 comprises a carriage plate 48, on which suitable wheels, such as whe~ls 50, are fastened to register with conveyor rails 38 and 40. Rails 38 and 40 are "V" shaped in profile, and the wheels 50 are grooved to ride along the rails. The intensifier 20 is fastened to the plate 48 by any suitable means, represented by the clamps 52.
. The plate 48 is provided at each end with a chain attachment 54. Carriage drive means, namely 56 (Figures 3 and 4) are attached to the attachments 54. Chain 56 runs : 20 around guide means, namely an idler sprocket 58 at one end of the support bar 12, and at the other end, around a drive sprocket 60, driven by a motor 62.
In order to assist in controlling and supporting the upper run of the chain 56, support sprocket 64 is mounted on wall 42 (Figure 2), having a chain retention device 66.
It will be appreciated that the intensi~ier 20 requires to be connected to a source of power fluid, and may require a return, and also, a source of jet fluid.
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2 0 ~ 2 Since the carriage has to move from one end of the support bar to the other, ~lexible supply hoses are provided. In order to contain and control such flexible hoses, a flexible hose jacket: 66 is provided, being secured as at 68, to bottom wall 32. Flexible jacket 66 extends along the bottom wall 32, ancl forms a 'IU'' bend, indicated as 70, and an upper return portion 66a of the jacket 66 extends over wall 42. It is secured to a bracket 72, which is in turn secured to plate 48.
As shown in Figures 3 and 4, the plate is shown in two different positions. It will be appreciated that in Figure 3, jacket portion 66a, i.e., the upper portion, is much longer than the lower portion 66, whereas in Figure 4, the upper portion 66a is much shorter than the lower portion 66.
The hoses required to operate the intensifier 22 of this embodiment comprised power fluid supply and return hoses 74 and 76, and a jet fluid supply hose 78.
Hoses 74, 76, and 78, are connected to respective pipes, indicated as 74a, 76a, and 78a (Figures 1 and 3).
Conduits 74a and 76a axe connected to power fluid pump 16, and a suitable power fluid reservoir may be ; provided (not shown) in a manner well known in the art.
Conduit 78a is connected preferably via a suitable filter 79 to a supply of ~et fluid, typically water, , ... , . ... ...., . .. ~
~ ~ preferabiy via a suitable filter (not shown).~
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Connections are made, as indicated in phantom in Figure 5, between the hoses 74, 76, and 7~, to .
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rigid conduits 74b, 76b, and 78b (Figure 5) connected from plate 48 to intensifier 20. '!
The portions of the conduits extending between the plate 48 and the hoses 7~, 76 and 78 are shown merely in phantom for the sake of clarity.
Intsnsifier 20 may be of a known design, having a plurality, in this case four, working cylinders and a corresponding number of intensifier cylinders. Working pistons operating in the working cylinders are connected to intensi~ier pistons in intansifier cylinders. The working pistons are supplied with hydraulic fluid via a valve at a first pressure, e.g., 2,000-3,000 psi.
The intensi~ier pistons are supplied with a jet ~luid at a second pressure, e.g., 60-100 psi.
The intensi~ier pistons have a diameter less than that of the working pistons. Power ~luid, in this case hydraulic fluid, is supplied to the working pistons in sequence, and the pressure of the hydraulic fluid is conveyed to the jet fluid in the intensifier cylinder at an intensified or third pressure.
The high pressure jet ~luid is discharged from the intensifier through a rigid jet conduit 82 to a jet nozzle 84.
As best shown in Figure 5, the jet nozzle 84 is located in a plate 86, supported on a support arm 88, which is in turn mounted on the plate 48.
In an alternate embodiment, means may be provided to - exhaust the air between the web, and the plate. Such ,:
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~031~3~2 means, a~ shown generally as 22a in Figure 6, may comprisethe vacu-lm plate 90, mounted on side walls 92, which are, in turn, mounted on a back place 94 and which define a hollow interior. Vacuum plate 90 i5 located to extend from upstream to downstream of the jet 84, having regard to the direction of web travel.
Vacuum plate 90 is provided with a plurality of air passageway means 96, through which air may be withdrawn.
Air is exhausted therethrough by means of a fan 98 and a motor 100, and is vented to atmosphere through discharge opening 102.
Electrical power is supplied to the fan motor 100 by any suitable cable connection means 104 supplied through the hose support 66 and arm 88.
The design and construction of the intensifier is not illustrated, sinca it is believed that such intensifiers may be made in a variety of different designs. Examples of the intensifiers of this general type may be seen in various patents, such as U.S. Letters Patent 2,243,978 entitled Rotary Hydraulic Intensifier, and U.S. letters patent 2,876,704 entitled Hydraulic Transformer.
In operation, during the normal running o~ the paper making machine, the rollers R1 and R2 will be rotating at high speed, and the web will be moving in the direction of the arrow "a", at up to six thousand feet per minute for example.
In this situation, during normal operation, the carriage 14 will be stored at Point P1 (Figure 7) at one , '' ~'' ' ~' . ',, ' - ':
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end of the support bar 12.
Upon the occurrence of a break in the web downstream of roll R2, the motor 62 is operated to drive the carriage 14 along bar 12, to a po.int P2 close to the edge o~ the web, as shown in Figure 7. This point P2, at which the carriage 14 will stop, may be approximately three inches in from the edge of the web. The motor 18, at this point, operates pump 16, supplying hydraulic ~luid typically at a first pressure, for example, 3,000 psi, to the intensifier 20.
At the same time, jet fluid, such as water, is supplied via a hose 78 to the intensifier 20 at a second pressure o~ between 60-100 psi. The operation of the intensifier will cause a high pressure jet to be emitted from nozzle 84, typically at a nominal third pressure of around 15,000 to 20,000 psi~ -:
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Just so long as the carriage 14 remains stationary in this position, the jet will cut a continuous longitudinal cut, indicated as "C1" (Figure 7) to form the tail T on the web W.
: The cut, and tail, will of course be much longer than that shown in Figure 7.
When a sufficiently long tail has been cut to enable it to be rethreaded downstream o~ roll R2, in a manner known per se, the motor 62 is then operated so as to cause carriage 14 to traverse across the web to the point P3, as shown in Figura 7. Since the web ls moving at high `~ speed, this traverse movement will produce a diagonal or , .
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~0~ 02 oblique cut, indicated gener~lly as "c2". In practice, the angle of the diagonal cut will be more gradual than that indicated in Figure 7. This will then cause the entire web to be rethreaded through the stations downstream of : roll R2, so that winding up of the paper can then continue.
After a predetermined time delay, typically for example, two seconds, at the point P3, the supply of hydraulic fluid is shut off, and the supply of jet fluid is cut off, thereby terminating the emission of the cutting jet from nozzle 84. The carriage 14 is then traversed back along the bar 12 back to the point P1, where it is "parked"
ready for the next operation.
- In the us~ oP the Figure 6 embodiment, air is withdrawn from between the web W, and the nozzle 84. This is achieved by operating the motor 100 and fan 98, while in : the position P2, and while the intensifier and carriage are being traversed across the web to the position P3.
: . The operation of the fan 9;8 will cause induction of air through the opening means ~9~ around the nozzle 84. . :~
Such air will be ejected through the opening 102.
: ~his will tend to cause the web W to cling more closely to the nozzle 84, and thus, produce a cleaner cut.
The foregoing is a description o~ a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comprehends all such variations thereo~ as coming within ~ the scope of the appended claims~
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BACKGROUND OF THE INVENTION
The cutting of paper during manufacture in a paper making machine presents a series of problems. The web of paper will be moving through the machine at high speeds, and cuts may be required which are longitudinal and also more importantly which are diagonal to the axis of the web.
During the manufacture of paper, the wet fibre sheet (pulp or paper) is fed around drying rollers or dryers, by means of blankets which squeeze the paper/pulp on to the dryers. The dryers are heated, and the pulp is rapidly dried. There may be a multitude of such drying rolls and webs in the machine, and it is necessary to run the machine ~ontinuously without stopping, as long as there is ~ibre being fed from the upstream end. The web of paper becomes - progressively longPr, as it passes from the upstream end to the downstream end of the line, and thus the dryers must be run progressively faster and faster, from the upstream end to the downstream end.
At the downstream end, the dried paper web which is then moving at high speed is then fed onto a stack of vertical rolls known as a calender (not shown) and from there to a wind-up station or reel to form rolls of paper around reel bars (not shown). The rolls are. then removed for finishing and delivery to customers.
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It is well known that the web o~ paper at the downstream end, just prior to the calender and reel is fragile, and in practice breakages in the web before, or at -this point are relatively frequent.
The web, which may for example be thirty feet wida, must then be, as it were, re--threaded onto the calender stack and re-threaded again onto the reel.
With a full width web, this is simply impractical.
In fact, the practice is to cut what is called a "tail"
which may be about three inches wide, on one side of the web, and the tail is then re-threaded, typically for example by an air blast, into the afor~mentioned calender and reel sections (the downstream wind-up rolls). The tail will then carry the rest of the web on its desired path.
The web will usually break between the last of the dryers, and the aforementioned wind-up sections of the line. Accordingly, the tail ut may be made one or two dry~rs back up the line from its downstream end, at a position where the web of paper is still securely stretched between two sets of dryers. The cutting of this tail, first of ~11 involves the making of a first longitudinal cut parallel to the edge of the web to create the tail, and then a second transverse cut back over to the first edge o~
the webO
These cuts are, of course, made while the web is still moving at high speed and con equently, the transverse cut, in fact, produces a cut which is diagonal to the axis of the web.
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;: ;.: , ~ .;, , , - .
. ~:,. . .. .
.: , . ~ . .: ' ,. , ' .~ " ~ ' : '. , ' 20'~1~0?, In the past, this has been done b~ various mechanical devices such as fixed knife blades, and rotating knif0 blades and the like. carriages have been provided to move the knife blades from one sid~e of the web to the other and back again in various ways. These solutions however have not been entirely satisfactory. A principal problem is the fact that paper is a relatively abrasive material, and when a knife blade is held in a web of paper moving at high speed it rapidly becomes dull. The tail cutting operation may have to be performed several times in a single shift, and the kni~e used must be re-sharpened between each cutting operation, in order to maintain continuity of production.
Howev~r, any knife blade whether fixed or rotary is inherently unsuitable for making a diagonal cut in a moving web of paper. Since the knife blade must be held with its edge lying along the longitudinal axis of the web, then when the knife blade is moved sideways transversely, the side surface of the blade will be pressed against the web and it will tend to tear rather than cut. This problem is, of course, greatly aggravated when using a rotary knife blade, since it presents, relatively speaking, a far greater width, when moved transversely across the moving web o~ paper than a ~ixed knife blade.
It is highly desirable to provide some form of cutting method having a device which produces a point cut pre~erably without mechanical contact, so that when the device is moved transversely, it does not present a side :' ' . ~ ~ . ' ' .
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;` ' ~ ` ~, 2~ 02 face to int~rfere with the web.
In th~ past, high pre~sure jet cutting d~vices have been used in other applications. However these jet devices have never been successfully applied to tail-cutting4 One of the problems is that it i5 necessary to traverse the cutting device over a distance of thirty feet or more, i.e., the width of the web. llhe space where the cutting device must be traversed is located between two sets of dryers in the line and spac~ i5 relatively limited. In the past, most known jet cutting systems developed the high pressure jet cutting fluid at a location to one side of the machine, and then ~ed the high pressure fluid to a nozzle, by means of rigid high pressure hoses. Hoses capable of handling these high pressures and temperatures were, generally speaking, too rigid and massive and were unsuitable for this type of application. In addition ~elatively large line losses were encountered leading to substantial inefficiencies.
There are other applications in the paper-making industry as well as in other industries, where jet cutting devices are used as slitters, making straight longitudinal cuts along the web axis. The systsms, of course, do not encounter the type of problems described above. Nozzles may be placed in a fixed location. High pressure fluid may be supplied to the nozzles by suitable rigid metallic ;~;! plping, and a high pressure source such as a pump or intensifier may be located to one side of the machine, in a fixed location. Such systems were however incapable of :' , .. . . .
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' "' , 2~3 ~802 making d.iagonal cuts in a moving web, and were in no way comparable to the present invention.
The particular operation described above, namely the cutting of a tail on a moving web of paper, presents these - various problems in a particularly acute form. However, -: generally.similar problems occur in the paper-making industry, or in any other web processing industry, in any :
; situation where it is attempted to cut a web moving at high speed, wherein the cutting device moves diagonal to the web axis. The invention is not to be confined solely to the ~ cutting of a tail for re-threading purposes, but is of .; application to any situation where it is desired to form a : diagonal cut or cuts in a web of material moving at high speed.
~; BRIEF SUMMARY OF THE INVENTION
With a view to solving the various problems noted above, the invention provides an apparatus for cutting a moving web of thin material, said web passing around , .
upstream and downstream rolls adjacent to one another, said apparatus comprising conveyor means adapted to be .~: positionDd between said upstream and downstream rolls, carriage means movably mounted on saicl conveyor means and adapted to be moved therealong, and power-operated .~ movement means for moving the same, pressure intensifier means mount:e~cl on said carriage means, whereby said intensifier means may be moved by said carriage means relative to said web, flexible jet fluid supply conduit means connected to said intensifi~r means for supplying a '' . ' : , , ' ~ ' ` ~ . ':
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.
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jet fluid thereto at a predetermilled first pressure, flexible power conduit means connected to said intensifier means for supplying a power fluid thereto at a predetermined second pressure, operation of said intensifi2r means by said power fluid intensifying the pressure of said jet fluid from said first pressur~ to a predetermined third pressure, and jet nozzle means connected to said intensifier means, and located at a point closely overlying said web, and adapted to discharge said jet fluid at said predetermined third pressure, whereby to cut said web.
More particularly, it is an objective o~ the invention to provide an apparatus having the foregoing advantages, and including elongated housing means defining a top wall, a rear wall, and a bottom wall, and wherein said conveyor rail means are mounted on said top and bottom ~r walls, and wherein said jet fluid supply hose means and said power ~luid power hose means are located within said housing means.
More particularly, it is an objective of the invention to provide an apparatus having the ~oregoing advantages, and including an elongated flexible hose support means located within said housing means, and wherein said jet fluid supply hose means and said power hose means are located within said flexible hose support means, ~or movement in response to movement o~
said carriage means.
More particularly, it i5 an objective o~ the .
.
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~'3:1~02 invention to provide an apparatus hav:ing the ~oregoing advantages wherein said flexible hose support means is secured approximately mid-way between the ends of said housing means, on said bottom wall thereof, and wherein said flexible hose support means extends along said botto~
wall, and upwardly towards sa:id top wall, and defines lower and upper support portions, spaced apart from one another, and a U-shaped bend portion extending therebetween.
More particularly, it is an objective of the invention to provide an apparatus having the foregoing advantages, and including carriage movement means, connected to said carriage means, control guide means at either end of said conveyor means, around which said carriage drive means is guided, power operated means for - moving said carriage drive means, whereby to move said carriage means ~rom along said conveyor means in both -; directions, and carriage drive support means on said carriage means, engageable with said carriage drive means, whereby to support the same intermediate said carriage guide means.
~ Xt is a further and related sbjective of the ;~ invention to provide an apparatus having the foregoing advantages and further including plate means located ~; adjacent to said jet nozzle means, and oriented at a predetermined angle, whereby ts lie closely adjacent to said web, and including openings in said plate means and suction means adapted to withdraw air from the space between said web and said plate means.
'::
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2031~3~2 The v~rious features of novelty which characterize the invention are poi.nted out with more particularity in the claims annexed to and ~orming a part of this disclosure. For a better understanding of the invention, its operating advantages and specific objects attained by its use, reference should be had to the accompanying drawings and descriptive matter in which there are illustrated and described preferred embodiments of the invention.
IN THE DRAWINGS
Figure 1 is a perspective illustration partially cut away, of upstream and downstream dryer rolls, carrying a ~ web, with the jet cutting apparatus of the invention, shown -~ positioned between the two rolls;
Figure 2 is a section along the line 2-2 of Figure 1;
Figure 3 is a front elevational view of the apparatus i .of Figure 1I with portions omitted for the sake of clarity, :.
-'~ and showing a portion of the apparatus in a first or retracted position;
-. 20 Figure 4 is a front elevational view corresponding to Figure 1 showing a portion of the apparatus with the carriage in a second or extended position;
Figure 5 is a perspective illustration of the intensifier portion of the apparatus;
Figure 6 is a perspective illustration of an alternate embodiment o the invention showin~ a modified form of the plate portion and jet nozzle of the intensifier, and, . ~
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.
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l g ~ 2 Figur~ 7 is a schema-tic plan view o~ a web of paper showing the cuts made by the invention.
- DESCRIPTION OF A SPECIF'IC EMB5)DIMEMT
As described above, the invention relates generally to the cutting o~ thin web mat:erial, and in particular, to the cutting o~ such thin web materials which are in motion at high speed such as thin paper webs in paper making machines.
The particular embodiment illustrated is designed and intended for the cutting of what is called a "tail" on a web o~ paper moving at high speed through successive dryer rolls in a paper making machine.
While it is not necessary ~or the purposes of this description to describe all of the features of a paper making machine, essentially, a paper making machine consists o~ a large number of rolls, some of which are heated for the purposes of drying the fibre. The fibre is .
pressed against the rolls by a series of endless belts or blankets. The rolls may be of considerable width, up to thirty feet or more in many cases.
As the paper pulp moves from the upstream end to the downstream end o~ the line of rolls, it progressively dries out and becomes thinner and longer. Thus, the downstream dryer rolls will be rotating at a much greater speed than the upstream rolls, and in fact, the velocity o~ the web around the last two or three dryer rolls may reach several thousand feet per minute. As the paper web exits from the last drying roll, it then passes to a calender and reel "
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2~1%~2 section.
During operation, it is well known that the web of paper may become broksn or torn, often between the last drying roll and the aforementioned calender and reel sections, and in fact, this may happen several times per day.
Due to its width, it is impractical to re-thread the torn end of the web directly into the calender and reel section. The practice for many years has been to cut the web between two of the drying rolls upstream of the end of the line, to provide what is called a "tail." A tail is a strip of the web approximately three inches wide along ~,',7 one edge of the web. This was done by making a cut with an implement such as a knife. The knife blade must be held stationary about three inches from one edge of the web while the tail is cut. Then the knife blade must be moved back across the web, to the other edge of the web. Since ; the web is of course moving during this cutting operation, the end result will be a single longitudinal cut parallel to one edge, and a second diagonal cut across the web to the other edge.
The tail is then more readily fed onto the calender and reel section, usually by means of an air blast, and the web will then re-thread itself through the calender and reel stations.
During this operation, the major portion of the web . . .
` o* paper between the last roll and the calender and reel section is simply discarded and in fact, is returned ` -10-, , , . . , ~ :
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~;; , ' : ' 203~02 to the upstream end of the line and reprocessed as pulp.
Referring now to Fiyure 1, the invention is there illustrated, being located between two dryer rolls of a conventional paper making machine. The two rolls are indicated as R1 and R2; R2 being downstream from R1. The web of paper is passing from roll R1 upwardly, around roll R2, in the direction of the arrow "a".
The entire device may also be located such, that it would be positioned between roll R1 and previous upstream roll (not shown), with the paper running in a downward direction. The autting apparatus in accordance with the invention is indicated by the general reference 10, and ~ comprises an elongated hollow support bar 12, and a - carriage 14.
Hydraulic power is provided by means of th~
power fluid pump 16 driven, for example, by a prime mover :~
such as electri¢al motor 18.
~ A pressure intensifier 20, is mounted on the carriage ; 14, and develops a high pressure water jet at the nozzle indicated generally as 22.
Referring now to Figures 2, 3 and 4~ the support bar 12 will be seen to comprise upper and lower elongated plate members 30 and 32, a back wall 34 (Figure 1), and an intermediate wall 36. The upper and lower walls, and the ` re~r wall and intermediate wall, together, form a hollow box section o~ great rigidity, adapted to provide a solid .: support for the device across the entire width of the web.
Suitable mounting means (not shown) will be connected to :' -:
. .
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2 ~ 2 the bar 12 for mountiny at either end on appropriate support structure (not shown).
Conveyor means are provided in the form of upper and lower conveyor rails 38 and 40, formed alony the free edges of upper and lower walls 30 and 32. A generally "U" shaped channel member having walls 42, 44 and 46, is attached to intermediate wall 36, and extends approximately one half the length of the support bar 12, for reasons to be described below.
The carriage means 14 comprises a carriage plate 48, on which suitable wheels, such as whe~ls 50, are fastened to register with conveyor rails 38 and 40. Rails 38 and 40 are "V" shaped in profile, and the wheels 50 are grooved to ride along the rails. The intensifier 20 is fastened to the plate 48 by any suitable means, represented by the clamps 52.
. The plate 48 is provided at each end with a chain attachment 54. Carriage drive means, namely 56 (Figures 3 and 4) are attached to the attachments 54. Chain 56 runs : 20 around guide means, namely an idler sprocket 58 at one end of the support bar 12, and at the other end, around a drive sprocket 60, driven by a motor 62.
In order to assist in controlling and supporting the upper run of the chain 56, support sprocket 64 is mounted on wall 42 (Figure 2), having a chain retention device 66.
It will be appreciated that the intensi~ier 20 requires to be connected to a source of power fluid, and may require a return, and also, a source of jet fluid.
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2 0 ~ 2 Since the carriage has to move from one end of the support bar to the other, ~lexible supply hoses are provided. In order to contain and control such flexible hoses, a flexible hose jacket: 66 is provided, being secured as at 68, to bottom wall 32. Flexible jacket 66 extends along the bottom wall 32, ancl forms a 'IU'' bend, indicated as 70, and an upper return portion 66a of the jacket 66 extends over wall 42. It is secured to a bracket 72, which is in turn secured to plate 48.
As shown in Figures 3 and 4, the plate is shown in two different positions. It will be appreciated that in Figure 3, jacket portion 66a, i.e., the upper portion, is much longer than the lower portion 66, whereas in Figure 4, the upper portion 66a is much shorter than the lower portion 66.
The hoses required to operate the intensifier 22 of this embodiment comprised power fluid supply and return hoses 74 and 76, and a jet fluid supply hose 78.
Hoses 74, 76, and 78, are connected to respective pipes, indicated as 74a, 76a, and 78a (Figures 1 and 3).
Conduits 74a and 76a axe connected to power fluid pump 16, and a suitable power fluid reservoir may be ; provided (not shown) in a manner well known in the art.
Conduit 78a is connected preferably via a suitable filter 79 to a supply of ~et fluid, typically water, , ... , . ... ...., . .. ~
~ ~ preferabiy via a suitable filter (not shown).~
~ . .. .
Connections are made, as indicated in phantom in Figure 5, between the hoses 74, 76, and 7~, to .
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rigid conduits 74b, 76b, and 78b (Figure 5) connected from plate 48 to intensifier 20. '!
The portions of the conduits extending between the plate 48 and the hoses 7~, 76 and 78 are shown merely in phantom for the sake of clarity.
Intsnsifier 20 may be of a known design, having a plurality, in this case four, working cylinders and a corresponding number of intensifier cylinders. Working pistons operating in the working cylinders are connected to intensi~ier pistons in intansifier cylinders. The working pistons are supplied with hydraulic fluid via a valve at a first pressure, e.g., 2,000-3,000 psi.
The intensi~ier pistons are supplied with a jet ~luid at a second pressure, e.g., 60-100 psi.
The intensi~ier pistons have a diameter less than that of the working pistons. Power ~luid, in this case hydraulic fluid, is supplied to the working pistons in sequence, and the pressure of the hydraulic fluid is conveyed to the jet fluid in the intensifier cylinder at an intensified or third pressure.
The high pressure jet ~luid is discharged from the intensifier through a rigid jet conduit 82 to a jet nozzle 84.
As best shown in Figure 5, the jet nozzle 84 is located in a plate 86, supported on a support arm 88, which is in turn mounted on the plate 48.
In an alternate embodiment, means may be provided to - exhaust the air between the web, and the plate. Such ,:
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~031~3~2 means, a~ shown generally as 22a in Figure 6, may comprisethe vacu-lm plate 90, mounted on side walls 92, which are, in turn, mounted on a back place 94 and which define a hollow interior. Vacuum plate 90 i5 located to extend from upstream to downstream of the jet 84, having regard to the direction of web travel.
Vacuum plate 90 is provided with a plurality of air passageway means 96, through which air may be withdrawn.
Air is exhausted therethrough by means of a fan 98 and a motor 100, and is vented to atmosphere through discharge opening 102.
Electrical power is supplied to the fan motor 100 by any suitable cable connection means 104 supplied through the hose support 66 and arm 88.
The design and construction of the intensifier is not illustrated, sinca it is believed that such intensifiers may be made in a variety of different designs. Examples of the intensifiers of this general type may be seen in various patents, such as U.S. Letters Patent 2,243,978 entitled Rotary Hydraulic Intensifier, and U.S. letters patent 2,876,704 entitled Hydraulic Transformer.
In operation, during the normal running o~ the paper making machine, the rollers R1 and R2 will be rotating at high speed, and the web will be moving in the direction of the arrow "a", at up to six thousand feet per minute for example.
In this situation, during normal operation, the carriage 14 will be stored at Point P1 (Figure 7) at one , '' ~'' ' ~' . ',, ' - ':
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.
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end of the support bar 12.
Upon the occurrence of a break in the web downstream of roll R2, the motor 62 is operated to drive the carriage 14 along bar 12, to a po.int P2 close to the edge o~ the web, as shown in Figure 7. This point P2, at which the carriage 14 will stop, may be approximately three inches in from the edge of the web. The motor 18, at this point, operates pump 16, supplying hydraulic ~luid typically at a first pressure, for example, 3,000 psi, to the intensifier 20.
At the same time, jet fluid, such as water, is supplied via a hose 78 to the intensifier 20 at a second pressure o~ between 60-100 psi. The operation of the intensifier will cause a high pressure jet to be emitted from nozzle 84, typically at a nominal third pressure of around 15,000 to 20,000 psi~ -:
:, ~
Just so long as the carriage 14 remains stationary in this position, the jet will cut a continuous longitudinal cut, indicated as "C1" (Figure 7) to form the tail T on the web W.
: The cut, and tail, will of course be much longer than that shown in Figure 7.
When a sufficiently long tail has been cut to enable it to be rethreaded downstream o~ roll R2, in a manner known per se, the motor 62 is then operated so as to cause carriage 14 to traverse across the web to the point P3, as shown in Figura 7. Since the web ls moving at high `~ speed, this traverse movement will produce a diagonal or , .
~, ; ~ . , ~: ,. , :' .
~0~ 02 oblique cut, indicated gener~lly as "c2". In practice, the angle of the diagonal cut will be more gradual than that indicated in Figure 7. This will then cause the entire web to be rethreaded through the stations downstream of : roll R2, so that winding up of the paper can then continue.
After a predetermined time delay, typically for example, two seconds, at the point P3, the supply of hydraulic fluid is shut off, and the supply of jet fluid is cut off, thereby terminating the emission of the cutting jet from nozzle 84. The carriage 14 is then traversed back along the bar 12 back to the point P1, where it is "parked"
ready for the next operation.
- In the us~ oP the Figure 6 embodiment, air is withdrawn from between the web W, and the nozzle 84. This is achieved by operating the motor 100 and fan 98, while in : the position P2, and while the intensifier and carriage are being traversed across the web to the position P3.
: . The operation of the fan 9;8 will cause induction of air through the opening means ~9~ around the nozzle 84. . :~
Such air will be ejected through the opening 102.
: ~his will tend to cause the web W to cling more closely to the nozzle 84, and thus, produce a cleaner cut.
The foregoing is a description o~ a preferred embodiment of the invention which is given here by way of example only. The invention is not to be taken as limited to any of the specific features as described, but comprehends all such variations thereo~ as coming within ~ the scope of the appended claims~
.
.
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Claims (9)
1. Apparatus for cutting a moving web of thin material, said web passing around upstream and downstream rolls adjacent to one another, said apparatus comprising:
conveyor means adapted to be positioned between said upstream and downstream rolls;
carriage means movably mounted on said conveyor means and adapted to be moved therealong;
power-operated movement means for moving the same and stopping same at predetermined locations;
fluid pressure intensifier means mounted on said carriage means, whereby said intensifier means may be moved and stopped by said carriage means relative to said web;
flexible jet fluid supply conduit means connected to said intensifier means for supplying a jet fluid thereto at a predetermined first pressure;
flexible power fluid conduit means connected to said intensifier means for supplying power fluid thereto at a predetermined second pressure, operation of said intensifier means by said power fluid intensifying the pressure of said jet fluid from said first pressure to a predetermined third pressure, and, jet nozzle means rigidly connected to said intensifier means, and located at a point closely overlying said web, and adapted to discharge said jet fluid at said predetermined third pressure, whereby to cut said web.
conveyor means adapted to be positioned between said upstream and downstream rolls;
carriage means movably mounted on said conveyor means and adapted to be moved therealong;
power-operated movement means for moving the same and stopping same at predetermined locations;
fluid pressure intensifier means mounted on said carriage means, whereby said intensifier means may be moved and stopped by said carriage means relative to said web;
flexible jet fluid supply conduit means connected to said intensifier means for supplying a jet fluid thereto at a predetermined first pressure;
flexible power fluid conduit means connected to said intensifier means for supplying power fluid thereto at a predetermined second pressure, operation of said intensifier means by said power fluid intensifying the pressure of said jet fluid from said first pressure to a predetermined third pressure, and, jet nozzle means rigidly connected to said intensifier means, and located at a point closely overlying said web, and adapted to discharge said jet fluid at said predetermined third pressure, whereby to cut said web.
2. Apparatus as claimed in Claim 1, and including elongated housing means defining a top wall, a rear wall, and a bottom wall, and wherein said conveyor means comprise rails mounted on said top and bottom walls, and wherein said jet fluid supply hose means are located within said housing means.
3. Apparatus as claimed in Claim 1, and including an elongated rectangular flexible hose support means located within said housing means, and wherein said jet fluid supply hose means and said power fluid hose means are located within said flexible support means, for movement in response to movement of said carriage means.
4. Apparatus as claimed in Claim 1, wherein said flexible support means is secured to said housing approximately mid-way between the ends thereof, on said bottom wall thereof, and wherein said flexible hose support means extends along said bottom wall, and upwardly towards said top wall, and defines lower and upper support portions, spaced apart from one another, and a U shaped bend portion extending therebetween.
5. Apparatus as claimed in Claim 1 including plate means located adjacent to said jet nozzle means, and oriented at a predetermined angle, whereby to lie closely adjacent to said web.
6. Apparatus as claimed in Claim 5 including fan housing means located adjacent said plate means, and air flow means adapted to withdraw air from the space between said web and said plate means, and opening means for withdrawing air therebetween.
7. Apparatus as claimed in Claim 5 including power apparatus for supplying power fluid, jet fluid source means for supplying jet fluid, rigid conduit means therefrom in said housing means connecting with said flexible hose means, and rigid conduit means connecting between said flexible hose means and said plate means.
8. A method of cutting a tail on a moving web of thin material, said web passing around upstream and downstream rolls adjacent to one another, and comprising the steps of;
positioning a cutting jet means, including a cutting jet nozzle rigidly connected thereto, at a pre-determined point adjacent one edge of said web;
causing said cutting jet means to emit a cutting jet, cutting said web along a longitudinal axis parallel to said edge, and, thereafter progressively traversing said cutting jet means transversely to the axis of said web whereby to procure a diagonal cut from said longitudinal cut, across said web to the opposite edge thereof.
positioning a cutting jet means, including a cutting jet nozzle rigidly connected thereto, at a pre-determined point adjacent one edge of said web;
causing said cutting jet means to emit a cutting jet, cutting said web along a longitudinal axis parallel to said edge, and, thereafter progressively traversing said cutting jet means transversely to the axis of said web whereby to procure a diagonal cut from said longitudinal cut, across said web to the opposite edge thereof.
9. A method as claimed in Claim 8 and further including the step of continuously inducting air around said jet nozzle of said jet cutting means, whereby to draw said web closely adjacent to said jet nozzle means, and emitting said air so inducted, at a point remote from said jet nozzle means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2031802 CA2031802A1 (en) | 1989-11-10 | 1989-11-10 | Jet cutting apparatus for thin web materials and method of cutting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CA 2031802 CA2031802A1 (en) | 1989-11-10 | 1989-11-10 | Jet cutting apparatus for thin web materials and method of cutting |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2031802A1 true CA2031802A1 (en) | 1991-05-11 |
Family
ID=4146613
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2031802 Abandoned CA2031802A1 (en) | 1989-11-10 | 1989-11-10 | Jet cutting apparatus for thin web materials and method of cutting |
Country Status (1)
| Country | Link |
|---|---|
| CA (1) | CA2031802A1 (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644962A (en) * | 1991-11-19 | 1997-07-08 | Valmet Corporation | Dryer section of a paper or board machine including an arrangement for cutting a leader of the web |
| US6681670B2 (en) | 2001-03-07 | 2004-01-27 | Paprima Industries Inc. | Water jet edge cutter with integral trim chute |
| AT500527A1 (en) * | 2001-02-09 | 2006-01-15 | Metso Paper Inc | NOZZLE UNIT FOR CUTTING BY LIQUID |
-
1989
- 1989-11-10 CA CA 2031802 patent/CA2031802A1/en not_active Abandoned
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5644962A (en) * | 1991-11-19 | 1997-07-08 | Valmet Corporation | Dryer section of a paper or board machine including an arrangement for cutting a leader of the web |
| US5758556A (en) * | 1991-11-19 | 1998-06-02 | Valmet Corporation | Method and arrangement for cutting a leader of the web in a paper or board machine in the drying section of the machine |
| US5852963A (en) * | 1991-11-19 | 1998-12-29 | Valmet Corporation | Dryer section in a paper or board machine including an arrangement for cutting at least one of a leader of a web |
| AT500527A1 (en) * | 2001-02-09 | 2006-01-15 | Metso Paper Inc | NOZZLE UNIT FOR CUTTING BY LIQUID |
| US7013777B2 (en) | 2001-02-09 | 2006-03-21 | Metso Paper, Inc. | Nozzle unit for cutting by means of liquid, and method for cutting using same |
| AT500527B1 (en) * | 2001-02-09 | 2007-01-15 | Metso Paper Inc | NOZZLE UNIT FOR CUTTING BY LIQUID |
| US6681670B2 (en) | 2001-03-07 | 2004-01-27 | Paprima Industries Inc. | Water jet edge cutter with integral trim chute |
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