CA2487208C - An apparatus for cutting a web with a water jet - Google Patents
An apparatus for cutting a web with a water jet Download PDFInfo
- Publication number
- CA2487208C CA2487208C CA 2487208 CA2487208A CA2487208C CA 2487208 C CA2487208 C CA 2487208C CA 2487208 CA2487208 CA 2487208 CA 2487208 A CA2487208 A CA 2487208A CA 2487208 C CA2487208 C CA 2487208C
- Authority
- CA
- Canada
- Prior art keywords
- support surface
- cutting
- web
- nozzle
- cutter head
- 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.)
- Expired - Fee Related
Links
Classifications
-
- 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
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B26—HAND CUTTING TOOLS; CUTTING; SEVERING
- B26F—PERFORATING; PUNCHING; CUTTING-OUT; STAMPING-OUT; SEVERING BY MEANS OTHER THAN CUTTING
- B26F3/00—Severing by means other than cutting; Apparatus therefor
- B26F3/004—Severing by means other than cutting; Apparatus therefor by means of a fluid jet
-
- D—TEXTILES; PAPER
- D21—PAPER-MAKING; PRODUCTION OF CELLULOSE
- D21F—PAPER-MAKING MACHINES; METHODS OF PRODUCING PAPER THEREON
- D21F7/00—Other details of machines for making continuous webs of paper
- D21F7/006—Cutting the edges of the paper-web
Abstract
The invention relates to an apparatus particularly for cutting a web with a water jet. The apparatus comprises support and positioning elements and a cutter head supported by them and extending to the edge part of the web (14) in the operating position. The cutter head comprises a support surface (13) provided with e.g. nodules (13.1-13.4) and at least one nozzle (28), which is so set that the edge part travels between the support surface (13) and the nozzle (28).
Description
AN APPARATUS FOR CUTTING A WEB WITH A WATER JET
This invention relates to an apparatus for cutting a web with a water jet, the apparatus comprising support and positioning elements and a cutter head s supported by them and extending in the operating position to the web edge area, the cutter head comprising a support surface, adaptable at least beneath the edge part, and at least one nozzle above it for forming a cutting jet with high-pressure water, the nozzle being so set that the edge part travels between the support surface and the nozzle for cutting a trim from the web. Here the web is generally a io paper web.
Finnish publication No. 98346 discloses an apparatus for cutting the edge of a paper web. For the actual cutting the apparatus comprises here a nozzle for forming a cutting jet with high-pressure water and a plane adapted beneath the nozzle. In the cutting situation the web travels between the nozzle and the plane is whereat the water jet cuts the web. For the cutting jet, the plane is provided with an opening and discharge connections at the opening below the plane for removing the cutting water from the apparatus. The plane is also called a table, the location of which together with the nozzle can be adjusted in the cross direction of the web.
Zo Publication EP870583B1 sets forth an apparatus for cutting a trim, in which the support plane is a separate item being formed of a ceramic material.
Known solutions involve the risk that the opening in the support plane gets blocked eventually. This causes a web break.
The objective of the invention is to provide an improved apparatus particularly for 2s cutting a web with a water jet without the above-mentioned disadvantage.
The features characterizing this invention become evident from the appended claims.
The apparatus according to the invention comprises several alternatives.
Blocking is avoided by leading compensating air to the opening for keeping the apparatus clean and thus for preventing the formation of a blister.
The invention is described below in detail by making reference to the enclosed drawings, which illustrate some of the embodiments of the invention, in which Figures 1 a -1 d illustrate various methods of providing a construction that creates an air gap in the support plane.
Figure 2 is a top view of a water cutting apparatus.
Figure 3 is a side view of another water cutting apparatus.
The apparatus of Figure 2 is a modification of the solution disclosed in publication EP 87058381. Here the apparatus comprises support and positioning elements, which are formed of a support arm and a guide construction adapted to it (not io shown). The support arm is attached to a suitable position in a paper machine and generally on both sides of the web. In addition to a paper machine, the apparatus can also be used in connection with board machines and similar for cutting even a thick web.
The cutter head comprises a support surface 13, adaptable at least below the is edge part, and at least one nozzle 28 above it for forming a cutting jet by means of high-pressure water. Deviating from the EP document, here the nozzle is arranged perpendicularly against the web. The cutter head is so arranged that the edge part travels between the support surface 13 and the nozzle 28, whereat a trim 54 is cut off the paper web 14. The cutter head additionally comprises connections for 2o removing the cutting water and the trim 54 from the apparatus. With the cutting water, part of the remains of cutting is also removed. On the support surface 13, there is an opening 84 at the impact point 52 of the water jet, and beneath the opening a connection arranged in a known manner for collecting off the jet.
The support surface 13 is supported to the frame 78. A compressed air nozzle 75, Zs used for removing the mist from the cutting area, is arranged behind the water nozzle 28.
The invention is related to the cutter head of the apparatus and particularly to keeping clean the support surface 13, which allows avoiding disturbances caused by the cutting procedure. To prevent blocking of the opening, compensating air is led thereto from between the paper and the support surface. For this purpose, at least in the vicinity of the opening there are nodules, cavities, ridges or grooves conveying air to the opening, and allowing the speed of the air flow to remove the remains of cutting from the opening. The nodules or ridges are harder than the surrounding.
According to Figures 1a-1d, the elements according to the invention conveying the air flow to the opening are composed for example of nodules 13.2 formed in the sheet, rivets 13.1 or the like embedded in the support surface, cavities 13.3 or grooves 13.4, which are preferably set radial to the opening. For these, the io opening in the support surface for passing the shower is not shown. In one embodiment, machine directional rods or wires are added in the environment of the discharge opening producing the same effect as the grooves or nodules.
These rods or wires can be either fastened directly to the sheet surface for example by welding or, for improving the fastening, the rods/wires can be is connected to machine directional grooves. In one embodiment, 6 piano wires (diameter 1 mm) were first welded on both sides at 5-mm interval in the machine direction with a 5-mm opening remaining between the center-most wires. In an additional embodiment, besides the above-mentioned wires, one shorter wire was welded at the center of them until to the opening from the web inlet direction. The 2o ends of the wires are rubbed down for avoiding sharp edges.
In Figure 2 the support surface is provided with rivets 13.1, which are flat in relation to their width.
A more preferable solution than the above described is shown in Figure 3. The nozzle 28 is here set perpendicular to the web 14. Reference number 13 refers to 2s a support plane according to the invention comprising said nodules, rivets or the like for improving the air flow into the opening 84. This solution is preferable firstly due to a straight-tube ejector 18. The discharge pipe is uniform over a major length and broadens finally at the bottom end, which prevents remains of fiber from accumulating and blocking the discharge pipe.
3o Another preferable feature is a forward auxiliary flow 19 (so-called tail shooter type) in a relatively narrow area at the point of cutting.
It will be understood that the foregoing description is merely by way of example, and shall not be construed as limiting. Further changes in the structure which would occur to a person skilled in the art are within the scope of the claims without departing from the spirit of the invention.
This invention relates to an apparatus for cutting a web with a water jet, the apparatus comprising support and positioning elements and a cutter head s supported by them and extending in the operating position to the web edge area, the cutter head comprising a support surface, adaptable at least beneath the edge part, and at least one nozzle above it for forming a cutting jet with high-pressure water, the nozzle being so set that the edge part travels between the support surface and the nozzle for cutting a trim from the web. Here the web is generally a io paper web.
Finnish publication No. 98346 discloses an apparatus for cutting the edge of a paper web. For the actual cutting the apparatus comprises here a nozzle for forming a cutting jet with high-pressure water and a plane adapted beneath the nozzle. In the cutting situation the web travels between the nozzle and the plane is whereat the water jet cuts the web. For the cutting jet, the plane is provided with an opening and discharge connections at the opening below the plane for removing the cutting water from the apparatus. The plane is also called a table, the location of which together with the nozzle can be adjusted in the cross direction of the web.
Zo Publication EP870583B1 sets forth an apparatus for cutting a trim, in which the support plane is a separate item being formed of a ceramic material.
Known solutions involve the risk that the opening in the support plane gets blocked eventually. This causes a web break.
The objective of the invention is to provide an improved apparatus particularly for 2s cutting a web with a water jet without the above-mentioned disadvantage.
The features characterizing this invention become evident from the appended claims.
The apparatus according to the invention comprises several alternatives.
Blocking is avoided by leading compensating air to the opening for keeping the apparatus clean and thus for preventing the formation of a blister.
The invention is described below in detail by making reference to the enclosed drawings, which illustrate some of the embodiments of the invention, in which Figures 1 a -1 d illustrate various methods of providing a construction that creates an air gap in the support plane.
Figure 2 is a top view of a water cutting apparatus.
Figure 3 is a side view of another water cutting apparatus.
The apparatus of Figure 2 is a modification of the solution disclosed in publication EP 87058381. Here the apparatus comprises support and positioning elements, which are formed of a support arm and a guide construction adapted to it (not io shown). The support arm is attached to a suitable position in a paper machine and generally on both sides of the web. In addition to a paper machine, the apparatus can also be used in connection with board machines and similar for cutting even a thick web.
The cutter head comprises a support surface 13, adaptable at least below the is edge part, and at least one nozzle 28 above it for forming a cutting jet by means of high-pressure water. Deviating from the EP document, here the nozzle is arranged perpendicularly against the web. The cutter head is so arranged that the edge part travels between the support surface 13 and the nozzle 28, whereat a trim 54 is cut off the paper web 14. The cutter head additionally comprises connections for 2o removing the cutting water and the trim 54 from the apparatus. With the cutting water, part of the remains of cutting is also removed. On the support surface 13, there is an opening 84 at the impact point 52 of the water jet, and beneath the opening a connection arranged in a known manner for collecting off the jet.
The support surface 13 is supported to the frame 78. A compressed air nozzle 75, Zs used for removing the mist from the cutting area, is arranged behind the water nozzle 28.
The invention is related to the cutter head of the apparatus and particularly to keeping clean the support surface 13, which allows avoiding disturbances caused by the cutting procedure. To prevent blocking of the opening, compensating air is led thereto from between the paper and the support surface. For this purpose, at least in the vicinity of the opening there are nodules, cavities, ridges or grooves conveying air to the opening, and allowing the speed of the air flow to remove the remains of cutting from the opening. The nodules or ridges are harder than the surrounding.
According to Figures 1a-1d, the elements according to the invention conveying the air flow to the opening are composed for example of nodules 13.2 formed in the sheet, rivets 13.1 or the like embedded in the support surface, cavities 13.3 or grooves 13.4, which are preferably set radial to the opening. For these, the io opening in the support surface for passing the shower is not shown. In one embodiment, machine directional rods or wires are added in the environment of the discharge opening producing the same effect as the grooves or nodules.
These rods or wires can be either fastened directly to the sheet surface for example by welding or, for improving the fastening, the rods/wires can be is connected to machine directional grooves. In one embodiment, 6 piano wires (diameter 1 mm) were first welded on both sides at 5-mm interval in the machine direction with a 5-mm opening remaining between the center-most wires. In an additional embodiment, besides the above-mentioned wires, one shorter wire was welded at the center of them until to the opening from the web inlet direction. The 2o ends of the wires are rubbed down for avoiding sharp edges.
In Figure 2 the support surface is provided with rivets 13.1, which are flat in relation to their width.
A more preferable solution than the above described is shown in Figure 3. The nozzle 28 is here set perpendicular to the web 14. Reference number 13 refers to 2s a support plane according to the invention comprising said nodules, rivets or the like for improving the air flow into the opening 84. This solution is preferable firstly due to a straight-tube ejector 18. The discharge pipe is uniform over a major length and broadens finally at the bottom end, which prevents remains of fiber from accumulating and blocking the discharge pipe.
3o Another preferable feature is a forward auxiliary flow 19 (so-called tail shooter type) in a relatively narrow area at the point of cutting.
It will be understood that the foregoing description is merely by way of example, and shall not be construed as limiting. Further changes in the structure which would occur to a person skilled in the art are within the scope of the claims without departing from the spirit of the invention.
Claims (7)
1. An apparatus particularly for cutting a web by means of a water jet comprising - a cutter head that extends to the edge area of the web (14) in the operating position, - a support surface (13) in the cutter head adaptable at least beneath the edge part, - at least one nozzle (28) in the cutter head above the edge part for forming a cutting jet by means of high-pressure water, the nozzle (28) being so set that the edge part travels between the support surface (13) and the nozzle (28) for cutting a trim (54) from the paper web (14), - support and positioning elements for supporting the cutter head and for adjusting the nozzle (28) and the support surface (13) in the cross direction of the web (14), and - a connection set below the support surface (13) and opening in the direction of the cutting jet for collecting and removing cutting water from the apparatus, - an opening (84) arranged on the support surface (13) at the jet impact point (84) for leading the cutting jet to the said underneath connection, characterized in that the support surface (13) comprises elements (13.1-13.4) providing an air gap for leading the air between the web and the support surface (13) to the said opening.
2. An apparatus according to claim 1, characterized in that the support surface (13) has nodules (13.2).
3. An apparatus according to claim 1, characterized in that the support surface (13) has flat rivets (13.1 ).
4. An apparatus according to claim 1, characterized in that the support surface (13) has cavities (13.3).
5. An apparatus according to claim 1, characterized in that the support surface (13) has grooves (13.4).
6. An apparatus according to any of claims 1-5, characterized in that it comprises an ejector (18) set beneath the nozzle in the said connection, with an essentially uniform diameter in the suction area.
7. An apparatus according to any of claims 1-6, characterized in that it comprises a forward blow (19) directed to beneath the web (14) towards the cutting point.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FIFI20035246 | 2003-12-19 | ||
| FI20035246A FI117822B (en) | 2003-12-19 | 2003-12-19 | Apparatus for cutting a web with a water jet |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CA2487208A1 CA2487208A1 (en) | 2005-06-19 |
| CA2487208C true CA2487208C (en) | 2010-10-26 |
Family
ID=29763646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA 2487208 Expired - Fee Related CA2487208C (en) | 2003-12-19 | 2004-11-09 | An apparatus for cutting a web with a water jet |
Country Status (3)
| Country | Link |
|---|---|
| CA (1) | CA2487208C (en) |
| DE (1) | DE102004055755A1 (en) |
| FI (1) | FI117822B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE541606C2 (en) | 2017-06-21 | 2019-11-12 | Valmet Oy | A paper making machine and a method of cutting a fibrous web in a paper making machine |
-
2003
- 2003-12-19 FI FI20035246A patent/FI117822B/en not_active IP Right Cessation
-
2004
- 2004-11-09 CA CA 2487208 patent/CA2487208C/en not_active Expired - Fee Related
- 2004-11-19 DE DE200410055755 patent/DE102004055755A1/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FI117822B (en) | 2007-03-15 |
| FI20035246A (en) | 2005-06-20 |
| CA2487208A1 (en) | 2005-06-19 |
| FI20035246A0 (en) | 2003-12-19 |
| DE102004055755A1 (en) | 2005-07-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| EEER | Examination request | ||
| MKLA | Lapsed |
Effective date: 20141110 |