CA2149344A1 - Method and device for collecting and removing dust separated from a web in a paper machine - Google Patents
Method and device for collecting and removing dust separated from a web in a paper machineInfo
- Publication number
- CA2149344A1 CA2149344A1 CA002149344A CA2149344A CA2149344A1 CA 2149344 A1 CA2149344 A1 CA 2149344A1 CA 002149344 A CA002149344 A CA 002149344A CA 2149344 A CA2149344 A CA 2149344A CA 2149344 A1 CA2149344 A1 CA 2149344A1
- Authority
- CA
- Canada
- Prior art keywords
- web
- blowing
- air
- pressure
- suction
- 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
Links
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/02—Cleaning by the force of jets, e.g. blowing-out cavities
- B08B5/023—Cleaning travelling work
- B08B5/026—Cleaning moving webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B5/00—Cleaning by methods involving the use of air flow or gas flow
- B08B5/04—Cleaning by suction, with or without auxiliary action
- B08B5/043—Cleaning travelling work
- B08B5/046—Cleaning moving webs
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B08—CLEANING
- B08B—CLEANING IN GENERAL; PREVENTION OF FOULING IN GENERAL
- B08B2205/00—Details of machines or methods for cleaning by the use of gas or air flow
- B08B2205/005—Using the coanda effect of the gas flow/stream
Abstract
A method and device in a paper machine or in a finishing device of a paper machine, in particular in a slitter-winder, for collecting and removing dust and other particles that are separated from a web. In the method, an air blowing is directed at the web to separate dust from the web and a suction effect is applied to the web to remove the separated dust out of connection with the web. Preferably, a high-pressure blowing is directed at the web at a blowing region to separate the dust from the web, before the high-pressure blowing in the running direction of the web, dust and other particles separated from the web are sucked off in a first suction region and after the high-pressure blowing in the running direction of the web, the dust and other particles are sucked off in a second suction region. The device includes a pressurized chamber space in which there is a nozzle opening for the applica-tion of an air blowing to the web and a suction opening/openings for removing the dust present in connection with the web. The air chamber in the device is pressurized and a high-pressure blowing is blown through the nozzle opening of this air chamber toward the web and the suction openings of the device are placed before and after the nozzle opening in the running direction of the web.
Description
~149344 METHOD AND DEVICE FOR COLLECTING AND REMOVING
DUST SEPARATED FROM A WEB IN A PAPER MACHINE
BACRGROUND OF THE lNv~N,lON
The present invention relates to a method in a paper machine or in a finishing device of a paper machine, in particular in a slitter-winder, for collecting and removing dust and other particles that is separated from a web. In the method, an air blowing is directed at the web in order to separate dust from the web and suction is applied to the web to remove the separated dust out of connection with the web.
Further, the present invention relates to a device in a paper machine or in a finishing device of a paper machine, in particular in a slitter-winder, for collecting and removing dust and other particulate matter that is separated from the web. The device comprises a pressurized chamber space in which there is a nozzle opening for the application of a directed air blowing to the web and a suction opening/openings for removing the dust separated from the web by the directed air blowing.
After the manufacture of paper in a paper machine, dust and impurities adhere to the face of the paper web, such as debris and fibers derived from the dryer section of the paper machine.
Another, and perhaps the most important, source of dust is the slitting process itself in which component webs of desired width are slit out of a web of full width and then wound by means of a winder into customer rolls. This dust and these impurities cause problems in the further processing of the paper, in particular in printing, because keeping the printing rolls clean is of essential importance in order to maintain an adequate printing quality.
Also, dust spreads into the environment both in the paper mill and in the further processing of the web, and the dust may induce health risks at work, because it contains various filler particles.
With respect to the prior art, reference is made to Finnish Patent Nos. 78,944 and 82,105, in which devices and methods for dust removal are described for use in particular in the manufacture of tissue paper.
In FI 78,944, a method and a device are described for collecting and removing dust that is separated from the web in a paper machine. In this reference, it has been considered the principal novelty of the method that blowings are applied to the web to both support the moving paper web free from contact and separate dust from the web and, moreover, at least partly carry the dust to its site of collecting. The device for carrying out the method comprises one or more dust suction boxes in which there are two nozzle boxes separated by an intermediate space and coanda nozzles or equivalent blowing means in opposite directions being placed at the sides of the nozzle boxes, that the intermediate space communicates with a suction space subjected to a vacuum, and that at the rear side of the dust suction box, there is a rear suction space which is open against the by-passing web and which communicates with a suction space subjected to a vacuum.
In FI 82,105, a method is described for removing dust that is separated in connection with the detaching-creping of a soft-tissue web by means of the creping doctor from a yankee cylinder. In ~14~3 1g connection with the yankee cylinder, part of the dust is carried along with a boundary layer consisting of air and which is caught by the effect of the running of the web from the yankee cylinder toward the reel-up and follows along with the web. In the method, the dust removing device is provided with an interior space and with a unified plane that stabilizes the web and is placed directly against the path intended for the creped web so that during its running, the web obtains a specified position tightly against the unified plane, and that, exclusively by sucking into the interior space, at least a substantial proportion of the boundary layer that contains dust is removed. In this Finnish patent, a device is also described for carrying out the method and comprises a path of a width equal to the width of the web in which there is, in the running direction of the web, a forward side edge and a rear side edge, a solid plane covering plate, which are arranged substantially to enclose the path while defining an interior space and to form a slot between the covering plate and at least one of the side edges, and members for producing a vacuum in the interior space so that air is sucked in through the slot. The device is intended for installation in a position in which the covering plate is placed directly against the path of transfer of the creped web, whereby the plane, unified covering plate produces an effect stabilizing the web, so that during its running, the web obtains a precise position tightly against the covering plate and the slot is placed in the boundary layer that contains dust.
With further respect to the prior art, reference is made to the U.S. Patent No. 4,715,078, in which a method and a device are described for cleaning the edges of a paper web at a slitter-winder and for removing dust detached from the edges. In the device shown in this patent, two cleaning rolls are used which are strategically placed in the path of running of the paper web. The first cleaning roll contacts the forward edge of the paper web when the paper web runs further from the slitter. At the same time as the paper web runs further, its upper face is also cleaned by the same roll. The second cleaning roll cleans the rear edge of the paper web as it runs further. By means of this roll, the lower face of the paper web is also cleaned. After this, by means of the vacuum system, the particles that are detached by the cleaning rolls are removed, and all of the four edges of the paper web are also cleaned. The pressure system removes the particles from the face of the paper web so that they can be carried off by means of the vacuum system.
In U.S. Patent No. 3,239,863, a web cleaning device is described in which a chamber space is employed in which two air nozzles directed towards the web have been formed. The space between the nozzles is closed so that it forms an exhaust chamber for the air discharged from the nozzles and for the dust detached from the web.
A problem in these prior art devices is how to produce a sufficiently high air blow velocity to detach dust adhering to the web, and also the necessity of constructing the devices so that they are placed quite far from the web, in which case they are mainly suitable for general dust removal, but not for detaching 214g~44 dust and impurities from the web.
OBJECTS AND SUMMARY OF THE lNV ~ ON
It is an object of the present invention to provide a method and device for removing dust by means of which it is also possible to detach dust and impurities adhering to the web and to clean the environment from dust and/or to prevent spreading of dust into the environment.
It is a further object of the present invention to provide a dust removing device that can be operated quite close to the web without the attendant risk of damage to the paper web.
It is another object of the invention to provide a device that can be shifted away from the path of the web in the event of a web break and/or during tail threading.
In view of achieving the objects stated above and others, in the method in accordance with the invention, a high-pressure air blowing is directed at the web at a blowing region in order to separate dust from the web, before the high-pressure blowing region in the running direction of the web, the dust and other particles separated from the web are sucked off by the application of a suction force in a first suction region, and after the high-pressure blowing region, additional quantities of dust and other particles separated from the web are sucked off by the application of a suction force in a second suction region.
The device in accordance with the invention includes a pressurized air chamber from which a high-pressure blowing is blown -2143~ 14 through a nozzle opening therein toward the web, and suction openings arranged both before and after the nozzle opening in the running direction of the web.
By means of the device in accordance with the invention, it is possible to remove the dust and impurities adhering to the face of the web, which dust and impurities cause problems in the further processing of the paper. Also, the dust load in the machine hall is reduced, whereby the working environment is also improved.
According to a preferred exemplifying embodiment of the invention, the device consists of two blow nozzles, one of which is a high-pressure dust-detaching nozzle and the other is a low-pressure air-curtain nozzle by whose means the detached dust is prevented from being carried into the machine hall. This preferred embodiment may also include two suction zones into which the dust and impurities detached from the web are sucked. The device communicates with an air system which carries the contaminated air into a wet separator or to some other, equivalent filter, from which the filtered air is passed either out of the machine hall or back into the machine hall. In the nozzles in accordance with the invention, the distance of the air blowing from the web is very small, from about 2 mm to about 5 mm, preferably just about 2 mm to about 3 mm, and the pressure used in the air space of the first air nozzle is from about 20,000 Pa to about 30,000 Pa, preferably from about 20,000 Pa to about 25,000 Pa, and the pressure in the air space of the second air nozzle is from about 300 Pa to about 1000 Pa, preferably from about 300 Pa to about 500 Pa, and ideally about 400 Pa. 2149~44 In another preferred exemplifying embodiment, the slot in the blow nozzle is about 0.5 mm, and the blow velocity employed in it is about 200 meters per second. In the suction nozzles, a high duct velocity is used, about 25 m/s to about 50 m/s, preferably about 30 m/s to about 40 m/s, in order that the contaminations present in the air should not adhere to the duct walls.
The method and devices in accordance with the invention are generally usable in the paper machine and in its finishing equipment, in particular in connection with a slitter-winder. In a slitter-winder, the dust removing devices are placed after the slitting as close to the slitting itself as possible, at each side of the web.
In connection with the device, measurement and guide devices may be arranged to maintain the distance of the device from the web at a desired level and by whose means, in the event of a web break or any other disturbance, the device can be shifted apart from the web. The device is attached to the frame constructions of the machine in such a manner that it is displaceable when desired.
In the method in accordance with the invention, the dust is detached from the web, the dust is removed, and the web is kept far enough from, but at the same time sufficiently close to, the blow device.
Also, in the method in accordance with the invention, the amount of air being directed at the web at the high-pressure blowing region is regulated relative to the amount of air being -~14934~
removed via the suction effect int he first and second suction regions such that the amount of air that is removed via the suction effect is about twice the amount of air that is directed at the web. Preferably, the distance between the web and a respective point from which each of the high-pressure blowing and a low-pressure curtain air blowing are directed at the web is measured and continuously regulated to provide optimum operating conditions.
In its most basic embodiment, the device comprises a frame including a first, pressurized air chamber, first nozzle means, i.e., a nozzle opening, for directing a high-pressure air blowing from the first chamber toward the web, and suction means for removing dust from the vicinity of the web, the suction means comprise at least one suction opening arranged before the nozzle opening in a direction of travel of the web and at least one suction opening arranged after the nozzle opening in the web travel direction. The frame may also include a second air chamber, second nozzle means, i.e., a nozzle opening, for directing a low-pressure air blowing from the second chamber toward the web, and a third air chamber having a nozzle opening through which air is blown during tail threading of the web. The device also includes measurement and regulation means for measuring and regulating the distance between the device and the web such that the distance between the device and the web remains constantly at a desired level.
In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings.
However, the invention is not strictly confined to the details of - 2149~44 these illustrations.
The following drawings are illustrative of embodiments of the invention and are not meant to limit the scope of the invention as encompassed by the claims.
Figure 1 is a schematic vertical sectional view in the machine direction of a device in accordance with the invention and which is used in a method in accordance with the invention.
Figure 2 is a schematic vertical sectional view of a device in accordance with the invention arranged at a slitter-winder in the runnlng position.
Figure 3 shows the device of Fig. 2 in the web threading positlon .
Figure 4 is a schematic illustration of a device in accordance with the invention in the direction of width of the web.
Figure 5 shows a schematic air diagram for the device in accordance with the invention.
Figure 6 is a schematic illustration of an exemplifying embodiment of the arrangement in accordance with the invention at a slitter-winder.
DETAILED DESCRIPTION OF THE lNv~..lON
Referring to the accompanying drawings wherein like reference numerals refer to the same or similar elements, in the exemplifying embodiment of the invention illustrated schematically in Fig. 1, a 21~934~
dust removing device 10 is arranged above a web W running in a direction of travel S. The device 10 comprises a pressurized chamber 11 into which blow air is introduced through a duct 14.
The chamber 11 has a nozzle opening 12 from which an intensive, directed air blowing P1 is blown toward the web at a blowing region so that any impurities and dust particles D adhering to the web are detached from the web W. Before the blow opening 12, the device 10 includes a suction opening 13 through which the detached dust and contamination particles D are removed from a first suction region by a suction effect in the direction of arrow I1 into a suction duct 15 and through suction duct 15 further into an exhaust duct 16. The blowing Pl blown out of the nozzle opening 12 constitutes a high-pressure blow whereas other directed air blowings P2 passed out of a chamber 21 in the device 10 through a blow opening 22 toward the web is a low-pressure blow and operates as an air curtain nozzle. Chamber 21 has a lip 28 which forms part of the blow opening 22. By means of air blowing P2, the detached dust D
is prevented from being carried into the machine hall and from being carried further along with the air layer moving along with the web W. Air is passed along a duct 24 into the blow chamber 21.
Between the first blow nozzle 12 and the second blow nozzle 22, there is a second suction opening 23 which functions to draw or suck any particles of impurities and dust D that may be present in the area between the nozzles, i.e., in a second suction region, into a suction duct 25 and from suction duct 25 further into the exhaust duct 16. The device also includes a chamber 31 out of - 21493-~
which, through a nozzle opening 32, blow air is passed toward the web W when the device is used for tail threading of the web W (Fig.
3).
The blowing P1 detaches the dust from the web W and, at the same time, keeps the web W far enough from the constructions of the device 10. The nozzle openings 12,22 are continuous slot nozzles having a gap width from about 0.2 mm to about 1 mm, preferably for example about 0.5 mm. The nozzle openings 12,22 extend in the transverse direction of the web W substantially across the entire width of the web W. The distance E of the device 10 from the web is between about 2 mm and 6 mm, preferably from about 2 mm to about 3 mm, during running. The blow velocity of the blowing P1 is, for example, from about 150 m/s to about 200 m/s, and the pressure employed in the chamber 11 is from about 20,000 Pa to about 30,000 Pa, preferably from about 20,000 to about 25,000 Pa. The blow velocity of the blowing P2 is, for example, from about 30 m/s to about 50 m/s, and the pressure employed in the chamber 21 is from about 500 Pa to about 1500 Pa, preferably about 500 Pa to about 750 Pa. The suction velocity in the suction openings 13,23 is between about 25 m/s and about 50 m/s, preferably from about 30 m/s to about 40 m/s. The gap width of the suction opening 13,23 is about 5 mm to about 20 mm, preferably from about 10 mm to about 15 mm.
It is a goal of the dimensioning of the components of the device 10 and the applied pressure and air blow velocities that the amount of air that is sucked from the first and second suction regions through the suction openings 13,23 is about twice as large 21~9344 as the amount of air that is blown through the nozzle openings 12,22. In this manner, it is substantially assured that the dust detached from the web is not spread into the environment. The second blow nozzle 22 produces the blowing P2 which, as stated above, operates as an air curtain nozzle and prevents any dust that may have been carried beyond the suction opening 23 from being carried further along with the web W and also prevents spreading of the dust into the environment.
The suction openings 13 and 23 are preferably provided with a perforated plate/net 17,27 which prevents access of any chaffed paper formed, for example, in connection with a web W break into the device 10.
The device 10 is constructed from sheet constructions which are shaped in the forms of the necessary chambers and ducts and which are assembled together by means of fastening members 61 which permit disassembly of the parts for the purpose of cleaning of the device 10. Nozzle plates 18 which form the first nozzle opening 12 are manufactured by machining, in which case the accuracy of the nozzle opening 12 can be made adequate. The nozzle plates 18,18' are also interconnected by means of fastening members 61 whereby cleaning of the chamber 11 and also cleaning of the nozzle opening 12 is easy and uncomplicated, if and when cleaning thereof is necessary. The device 10 includes a frame formed by the assembly of several material sheets and the suction ducts 15,25 are formed between the material sheets, i.e., the sheet defining the chamber 11 and the outer sheet which are held together by the fastening members 61.
In Fig. 2, an exemplifying embodiment of the device in accordance with the invention is shown arranged in connection with a web guide roll 49 after the slitter. The device 10 is in the running position, in which case it operates in the manner described above with respect to Fig. 1. The device 10 is attached to the other frame constructions 100 of the machine in a way in itself known, and the running of the web W is also guided by an auxiliary roll 101 arranged in connection with the device 10, e.g., attached to the same frame construction 100 before the device 10 in the running direction of the web.
In Fig. 3, the device 10 is shown shifted away from the vicinity of the web W which is its position during threading of the tail T of the web W. In the tail threading process, a nip N is formed between the auxiliary roll 101 and the web guide roll 49, through which nip the tail end T of the web W is passed. Out of the blow chamber 31 of the device 10, blowings P3 are blown which aid in the tail threading of the web W. The displacement of the device 10 from the position as shown in Fig. 2 to the position as shown in Fig. 3 is by any known displacement means. For tail threading, by regulating the air flow of the high-pressure air blowing P1 and the low-pressure air blowing P2 to decrease until they cease, only the blowings P3 are directed at the web to aid the tail threading.
Fig. 4 is a schematic sectional view of a dust removing device 10 arranged on a spread (deflected) web W. The device 10 has been - -21493~4 divided into a plurality of separate blocks 10' extending in a direction transverse to the running direction of the web, i.e., across the width thereof, whereby the blocks 10' and thus the blowings provided thereby can be arranged in accordance with the curve form of the web W. The number of the blocks 10' is from about 3 to about 5, preferably about 3, depending on the width of the web W. The distance E' of the blocks 10' from the web W is measured by means of measurement devices 40', for example, at the junction points between the blocks 10', and the data on the distances are conveyed from the measurement devices 40' to a control device 50.
Fig. 5 shows a schematic air diagram of the inventive method and device. Dust is sucked out of the web W through the suction zones 13,23 into the exhaust duct 16 from which the dust-containing air is passed to a washer 53 into which water is passed through a valve 54. After the washer 53, the washed air is passed into a dust separator 55 after which the air is passed through a exhaust blower 56 to the open air or back into the machine hall.
The clean filtered air is passed through a blow-air blower 52 into the blow-air ducts 14,24, and from the blow-air ducts 14,24 further into the blow chambers 11,21 from which, as shown in Fig.
1, out of the chamber 11 the dust-detaching blowings Pl are blown toward the web W, and out of the chamber 21, the air-curtain blowings P2 is formed.
In connection with the device 10, a measurement device 40 is arranged for measuring the distance E of the device 10 from the web 21~-~3~4 W, for example, by means of ultrasonic or laser measurement. From the measurement device 40, the information on the distance is passed to the control device 50 which regulates the distance E of the device 10 from the paper web W to the desired level, i./e., from about 2 mm to about 6 mm, preferably about 2 mm to about 3 mm.
The position of the device 10 in relation to the web W is regulated constantly, because, for example, on the spreader rolls placed after the slitter, the spreader roll may move up to 150 mm.
The control device 50 controls the movement of the device 10 on the frame constructions 100 of the machine. The arrangements of transfer of the device 10 can be carried out by means of guide and/or equivalent arrangements, which are known in themselves to a person skilled in the art. The control device 50 also controls the operation of the device so that, for example, in connection with a web break, the device 10 is shifted apart from the path of the web W.
Fig. 6 shows devices in accordance with the invention arranged in connection with a slitter 45. In the slitter 45, component webs of desired width are slit out of a web W of full width and then wound by means of a winder 48 into customer rolls. One device in accordance with the invention is arranged at the wire guide roll 49 placed after the slitter 45, at the opposite side of the web W, the next device is placed before the spreader rolls 46 at the same side of the web W, however, at the opposite side in relation to the former dust removing device. Finally, the web W is passed to the winder 48.
21~934~
The examples provided above are not meant to be exclusive.
Many other variations of the present invention would be obvious to those skilled in the art, and are contemplated to be within the scope of the appended claims.
DUST SEPARATED FROM A WEB IN A PAPER MACHINE
BACRGROUND OF THE lNv~N,lON
The present invention relates to a method in a paper machine or in a finishing device of a paper machine, in particular in a slitter-winder, for collecting and removing dust and other particles that is separated from a web. In the method, an air blowing is directed at the web in order to separate dust from the web and suction is applied to the web to remove the separated dust out of connection with the web.
Further, the present invention relates to a device in a paper machine or in a finishing device of a paper machine, in particular in a slitter-winder, for collecting and removing dust and other particulate matter that is separated from the web. The device comprises a pressurized chamber space in which there is a nozzle opening for the application of a directed air blowing to the web and a suction opening/openings for removing the dust separated from the web by the directed air blowing.
After the manufacture of paper in a paper machine, dust and impurities adhere to the face of the paper web, such as debris and fibers derived from the dryer section of the paper machine.
Another, and perhaps the most important, source of dust is the slitting process itself in which component webs of desired width are slit out of a web of full width and then wound by means of a winder into customer rolls. This dust and these impurities cause problems in the further processing of the paper, in particular in printing, because keeping the printing rolls clean is of essential importance in order to maintain an adequate printing quality.
Also, dust spreads into the environment both in the paper mill and in the further processing of the web, and the dust may induce health risks at work, because it contains various filler particles.
With respect to the prior art, reference is made to Finnish Patent Nos. 78,944 and 82,105, in which devices and methods for dust removal are described for use in particular in the manufacture of tissue paper.
In FI 78,944, a method and a device are described for collecting and removing dust that is separated from the web in a paper machine. In this reference, it has been considered the principal novelty of the method that blowings are applied to the web to both support the moving paper web free from contact and separate dust from the web and, moreover, at least partly carry the dust to its site of collecting. The device for carrying out the method comprises one or more dust suction boxes in which there are two nozzle boxes separated by an intermediate space and coanda nozzles or equivalent blowing means in opposite directions being placed at the sides of the nozzle boxes, that the intermediate space communicates with a suction space subjected to a vacuum, and that at the rear side of the dust suction box, there is a rear suction space which is open against the by-passing web and which communicates with a suction space subjected to a vacuum.
In FI 82,105, a method is described for removing dust that is separated in connection with the detaching-creping of a soft-tissue web by means of the creping doctor from a yankee cylinder. In ~14~3 1g connection with the yankee cylinder, part of the dust is carried along with a boundary layer consisting of air and which is caught by the effect of the running of the web from the yankee cylinder toward the reel-up and follows along with the web. In the method, the dust removing device is provided with an interior space and with a unified plane that stabilizes the web and is placed directly against the path intended for the creped web so that during its running, the web obtains a specified position tightly against the unified plane, and that, exclusively by sucking into the interior space, at least a substantial proportion of the boundary layer that contains dust is removed. In this Finnish patent, a device is also described for carrying out the method and comprises a path of a width equal to the width of the web in which there is, in the running direction of the web, a forward side edge and a rear side edge, a solid plane covering plate, which are arranged substantially to enclose the path while defining an interior space and to form a slot between the covering plate and at least one of the side edges, and members for producing a vacuum in the interior space so that air is sucked in through the slot. The device is intended for installation in a position in which the covering plate is placed directly against the path of transfer of the creped web, whereby the plane, unified covering plate produces an effect stabilizing the web, so that during its running, the web obtains a precise position tightly against the covering plate and the slot is placed in the boundary layer that contains dust.
With further respect to the prior art, reference is made to the U.S. Patent No. 4,715,078, in which a method and a device are described for cleaning the edges of a paper web at a slitter-winder and for removing dust detached from the edges. In the device shown in this patent, two cleaning rolls are used which are strategically placed in the path of running of the paper web. The first cleaning roll contacts the forward edge of the paper web when the paper web runs further from the slitter. At the same time as the paper web runs further, its upper face is also cleaned by the same roll. The second cleaning roll cleans the rear edge of the paper web as it runs further. By means of this roll, the lower face of the paper web is also cleaned. After this, by means of the vacuum system, the particles that are detached by the cleaning rolls are removed, and all of the four edges of the paper web are also cleaned. The pressure system removes the particles from the face of the paper web so that they can be carried off by means of the vacuum system.
In U.S. Patent No. 3,239,863, a web cleaning device is described in which a chamber space is employed in which two air nozzles directed towards the web have been formed. The space between the nozzles is closed so that it forms an exhaust chamber for the air discharged from the nozzles and for the dust detached from the web.
A problem in these prior art devices is how to produce a sufficiently high air blow velocity to detach dust adhering to the web, and also the necessity of constructing the devices so that they are placed quite far from the web, in which case they are mainly suitable for general dust removal, but not for detaching 214g~44 dust and impurities from the web.
OBJECTS AND SUMMARY OF THE lNV ~ ON
It is an object of the present invention to provide a method and device for removing dust by means of which it is also possible to detach dust and impurities adhering to the web and to clean the environment from dust and/or to prevent spreading of dust into the environment.
It is a further object of the present invention to provide a dust removing device that can be operated quite close to the web without the attendant risk of damage to the paper web.
It is another object of the invention to provide a device that can be shifted away from the path of the web in the event of a web break and/or during tail threading.
In view of achieving the objects stated above and others, in the method in accordance with the invention, a high-pressure air blowing is directed at the web at a blowing region in order to separate dust from the web, before the high-pressure blowing region in the running direction of the web, the dust and other particles separated from the web are sucked off by the application of a suction force in a first suction region, and after the high-pressure blowing region, additional quantities of dust and other particles separated from the web are sucked off by the application of a suction force in a second suction region.
The device in accordance with the invention includes a pressurized air chamber from which a high-pressure blowing is blown -2143~ 14 through a nozzle opening therein toward the web, and suction openings arranged both before and after the nozzle opening in the running direction of the web.
By means of the device in accordance with the invention, it is possible to remove the dust and impurities adhering to the face of the web, which dust and impurities cause problems in the further processing of the paper. Also, the dust load in the machine hall is reduced, whereby the working environment is also improved.
According to a preferred exemplifying embodiment of the invention, the device consists of two blow nozzles, one of which is a high-pressure dust-detaching nozzle and the other is a low-pressure air-curtain nozzle by whose means the detached dust is prevented from being carried into the machine hall. This preferred embodiment may also include two suction zones into which the dust and impurities detached from the web are sucked. The device communicates with an air system which carries the contaminated air into a wet separator or to some other, equivalent filter, from which the filtered air is passed either out of the machine hall or back into the machine hall. In the nozzles in accordance with the invention, the distance of the air blowing from the web is very small, from about 2 mm to about 5 mm, preferably just about 2 mm to about 3 mm, and the pressure used in the air space of the first air nozzle is from about 20,000 Pa to about 30,000 Pa, preferably from about 20,000 Pa to about 25,000 Pa, and the pressure in the air space of the second air nozzle is from about 300 Pa to about 1000 Pa, preferably from about 300 Pa to about 500 Pa, and ideally about 400 Pa. 2149~44 In another preferred exemplifying embodiment, the slot in the blow nozzle is about 0.5 mm, and the blow velocity employed in it is about 200 meters per second. In the suction nozzles, a high duct velocity is used, about 25 m/s to about 50 m/s, preferably about 30 m/s to about 40 m/s, in order that the contaminations present in the air should not adhere to the duct walls.
The method and devices in accordance with the invention are generally usable in the paper machine and in its finishing equipment, in particular in connection with a slitter-winder. In a slitter-winder, the dust removing devices are placed after the slitting as close to the slitting itself as possible, at each side of the web.
In connection with the device, measurement and guide devices may be arranged to maintain the distance of the device from the web at a desired level and by whose means, in the event of a web break or any other disturbance, the device can be shifted apart from the web. The device is attached to the frame constructions of the machine in such a manner that it is displaceable when desired.
In the method in accordance with the invention, the dust is detached from the web, the dust is removed, and the web is kept far enough from, but at the same time sufficiently close to, the blow device.
Also, in the method in accordance with the invention, the amount of air being directed at the web at the high-pressure blowing region is regulated relative to the amount of air being -~14934~
removed via the suction effect int he first and second suction regions such that the amount of air that is removed via the suction effect is about twice the amount of air that is directed at the web. Preferably, the distance between the web and a respective point from which each of the high-pressure blowing and a low-pressure curtain air blowing are directed at the web is measured and continuously regulated to provide optimum operating conditions.
In its most basic embodiment, the device comprises a frame including a first, pressurized air chamber, first nozzle means, i.e., a nozzle opening, for directing a high-pressure air blowing from the first chamber toward the web, and suction means for removing dust from the vicinity of the web, the suction means comprise at least one suction opening arranged before the nozzle opening in a direction of travel of the web and at least one suction opening arranged after the nozzle opening in the web travel direction. The frame may also include a second air chamber, second nozzle means, i.e., a nozzle opening, for directing a low-pressure air blowing from the second chamber toward the web, and a third air chamber having a nozzle opening through which air is blown during tail threading of the web. The device also includes measurement and regulation means for measuring and regulating the distance between the device and the web such that the distance between the device and the web remains constantly at a desired level.
In the following, the invention will be described in more detail with reference to the figures in the accompanying drawings.
However, the invention is not strictly confined to the details of - 2149~44 these illustrations.
The following drawings are illustrative of embodiments of the invention and are not meant to limit the scope of the invention as encompassed by the claims.
Figure 1 is a schematic vertical sectional view in the machine direction of a device in accordance with the invention and which is used in a method in accordance with the invention.
Figure 2 is a schematic vertical sectional view of a device in accordance with the invention arranged at a slitter-winder in the runnlng position.
Figure 3 shows the device of Fig. 2 in the web threading positlon .
Figure 4 is a schematic illustration of a device in accordance with the invention in the direction of width of the web.
Figure 5 shows a schematic air diagram for the device in accordance with the invention.
Figure 6 is a schematic illustration of an exemplifying embodiment of the arrangement in accordance with the invention at a slitter-winder.
DETAILED DESCRIPTION OF THE lNv~..lON
Referring to the accompanying drawings wherein like reference numerals refer to the same or similar elements, in the exemplifying embodiment of the invention illustrated schematically in Fig. 1, a 21~934~
dust removing device 10 is arranged above a web W running in a direction of travel S. The device 10 comprises a pressurized chamber 11 into which blow air is introduced through a duct 14.
The chamber 11 has a nozzle opening 12 from which an intensive, directed air blowing P1 is blown toward the web at a blowing region so that any impurities and dust particles D adhering to the web are detached from the web W. Before the blow opening 12, the device 10 includes a suction opening 13 through which the detached dust and contamination particles D are removed from a first suction region by a suction effect in the direction of arrow I1 into a suction duct 15 and through suction duct 15 further into an exhaust duct 16. The blowing Pl blown out of the nozzle opening 12 constitutes a high-pressure blow whereas other directed air blowings P2 passed out of a chamber 21 in the device 10 through a blow opening 22 toward the web is a low-pressure blow and operates as an air curtain nozzle. Chamber 21 has a lip 28 which forms part of the blow opening 22. By means of air blowing P2, the detached dust D
is prevented from being carried into the machine hall and from being carried further along with the air layer moving along with the web W. Air is passed along a duct 24 into the blow chamber 21.
Between the first blow nozzle 12 and the second blow nozzle 22, there is a second suction opening 23 which functions to draw or suck any particles of impurities and dust D that may be present in the area between the nozzles, i.e., in a second suction region, into a suction duct 25 and from suction duct 25 further into the exhaust duct 16. The device also includes a chamber 31 out of - 21493-~
which, through a nozzle opening 32, blow air is passed toward the web W when the device is used for tail threading of the web W (Fig.
3).
The blowing P1 detaches the dust from the web W and, at the same time, keeps the web W far enough from the constructions of the device 10. The nozzle openings 12,22 are continuous slot nozzles having a gap width from about 0.2 mm to about 1 mm, preferably for example about 0.5 mm. The nozzle openings 12,22 extend in the transverse direction of the web W substantially across the entire width of the web W. The distance E of the device 10 from the web is between about 2 mm and 6 mm, preferably from about 2 mm to about 3 mm, during running. The blow velocity of the blowing P1 is, for example, from about 150 m/s to about 200 m/s, and the pressure employed in the chamber 11 is from about 20,000 Pa to about 30,000 Pa, preferably from about 20,000 to about 25,000 Pa. The blow velocity of the blowing P2 is, for example, from about 30 m/s to about 50 m/s, and the pressure employed in the chamber 21 is from about 500 Pa to about 1500 Pa, preferably about 500 Pa to about 750 Pa. The suction velocity in the suction openings 13,23 is between about 25 m/s and about 50 m/s, preferably from about 30 m/s to about 40 m/s. The gap width of the suction opening 13,23 is about 5 mm to about 20 mm, preferably from about 10 mm to about 15 mm.
It is a goal of the dimensioning of the components of the device 10 and the applied pressure and air blow velocities that the amount of air that is sucked from the first and second suction regions through the suction openings 13,23 is about twice as large 21~9344 as the amount of air that is blown through the nozzle openings 12,22. In this manner, it is substantially assured that the dust detached from the web is not spread into the environment. The second blow nozzle 22 produces the blowing P2 which, as stated above, operates as an air curtain nozzle and prevents any dust that may have been carried beyond the suction opening 23 from being carried further along with the web W and also prevents spreading of the dust into the environment.
The suction openings 13 and 23 are preferably provided with a perforated plate/net 17,27 which prevents access of any chaffed paper formed, for example, in connection with a web W break into the device 10.
The device 10 is constructed from sheet constructions which are shaped in the forms of the necessary chambers and ducts and which are assembled together by means of fastening members 61 which permit disassembly of the parts for the purpose of cleaning of the device 10. Nozzle plates 18 which form the first nozzle opening 12 are manufactured by machining, in which case the accuracy of the nozzle opening 12 can be made adequate. The nozzle plates 18,18' are also interconnected by means of fastening members 61 whereby cleaning of the chamber 11 and also cleaning of the nozzle opening 12 is easy and uncomplicated, if and when cleaning thereof is necessary. The device 10 includes a frame formed by the assembly of several material sheets and the suction ducts 15,25 are formed between the material sheets, i.e., the sheet defining the chamber 11 and the outer sheet which are held together by the fastening members 61.
In Fig. 2, an exemplifying embodiment of the device in accordance with the invention is shown arranged in connection with a web guide roll 49 after the slitter. The device 10 is in the running position, in which case it operates in the manner described above with respect to Fig. 1. The device 10 is attached to the other frame constructions 100 of the machine in a way in itself known, and the running of the web W is also guided by an auxiliary roll 101 arranged in connection with the device 10, e.g., attached to the same frame construction 100 before the device 10 in the running direction of the web.
In Fig. 3, the device 10 is shown shifted away from the vicinity of the web W which is its position during threading of the tail T of the web W. In the tail threading process, a nip N is formed between the auxiliary roll 101 and the web guide roll 49, through which nip the tail end T of the web W is passed. Out of the blow chamber 31 of the device 10, blowings P3 are blown which aid in the tail threading of the web W. The displacement of the device 10 from the position as shown in Fig. 2 to the position as shown in Fig. 3 is by any known displacement means. For tail threading, by regulating the air flow of the high-pressure air blowing P1 and the low-pressure air blowing P2 to decrease until they cease, only the blowings P3 are directed at the web to aid the tail threading.
Fig. 4 is a schematic sectional view of a dust removing device 10 arranged on a spread (deflected) web W. The device 10 has been - -21493~4 divided into a plurality of separate blocks 10' extending in a direction transverse to the running direction of the web, i.e., across the width thereof, whereby the blocks 10' and thus the blowings provided thereby can be arranged in accordance with the curve form of the web W. The number of the blocks 10' is from about 3 to about 5, preferably about 3, depending on the width of the web W. The distance E' of the blocks 10' from the web W is measured by means of measurement devices 40', for example, at the junction points between the blocks 10', and the data on the distances are conveyed from the measurement devices 40' to a control device 50.
Fig. 5 shows a schematic air diagram of the inventive method and device. Dust is sucked out of the web W through the suction zones 13,23 into the exhaust duct 16 from which the dust-containing air is passed to a washer 53 into which water is passed through a valve 54. After the washer 53, the washed air is passed into a dust separator 55 after which the air is passed through a exhaust blower 56 to the open air or back into the machine hall.
The clean filtered air is passed through a blow-air blower 52 into the blow-air ducts 14,24, and from the blow-air ducts 14,24 further into the blow chambers 11,21 from which, as shown in Fig.
1, out of the chamber 11 the dust-detaching blowings Pl are blown toward the web W, and out of the chamber 21, the air-curtain blowings P2 is formed.
In connection with the device 10, a measurement device 40 is arranged for measuring the distance E of the device 10 from the web 21~-~3~4 W, for example, by means of ultrasonic or laser measurement. From the measurement device 40, the information on the distance is passed to the control device 50 which regulates the distance E of the device 10 from the paper web W to the desired level, i./e., from about 2 mm to about 6 mm, preferably about 2 mm to about 3 mm.
The position of the device 10 in relation to the web W is regulated constantly, because, for example, on the spreader rolls placed after the slitter, the spreader roll may move up to 150 mm.
The control device 50 controls the movement of the device 10 on the frame constructions 100 of the machine. The arrangements of transfer of the device 10 can be carried out by means of guide and/or equivalent arrangements, which are known in themselves to a person skilled in the art. The control device 50 also controls the operation of the device so that, for example, in connection with a web break, the device 10 is shifted apart from the path of the web W.
Fig. 6 shows devices in accordance with the invention arranged in connection with a slitter 45. In the slitter 45, component webs of desired width are slit out of a web W of full width and then wound by means of a winder 48 into customer rolls. One device in accordance with the invention is arranged at the wire guide roll 49 placed after the slitter 45, at the opposite side of the web W, the next device is placed before the spreader rolls 46 at the same side of the web W, however, at the opposite side in relation to the former dust removing device. Finally, the web W is passed to the winder 48.
21~934~
The examples provided above are not meant to be exclusive.
Many other variations of the present invention would be obvious to those skilled in the art, and are contemplated to be within the scope of the appended claims.
Claims (17)
1. A method in a paper machine or in a finishing device of a paper machine for collecting and removing dust and other particles separated from a web, comprising the steps of:
directing a high-pressure air blowing at the web at a high-pressure blowing region to separate dust from the web, applying a first suction to the web in a first suction region situated before said high-pressure blowing region in a direction of travel of the web to remove air containing the separated dust from the vicinity of the web, and applying a second suction to the web in a second suction region situated after said high-pressure blowing region to remove air containing the separated dust from the vicinity of the web.
directing a high-pressure air blowing at the web at a high-pressure blowing region to separate dust from the web, applying a first suction to the web in a first suction region situated before said high-pressure blowing region in a direction of travel of the web to remove air containing the separated dust from the vicinity of the web, and applying a second suction to the web in a second suction region situated after said high-pressure blowing region to remove air containing the separated dust from the vicinity of the web.
2. The method of claim 1, further comprising the step of:
regulating the amount of air being directed at the web at said high-pressure blowing region relative to the amount of air being removed from said first and second suction region such that the amount of air that is removed is about twice the amount of air that is directed at the web.
regulating the amount of air being directed at the web at said high-pressure blowing region relative to the amount of air being removed from said first and second suction region such that the amount of air that is removed is about twice the amount of air that is directed at the web.
3. The method of claim 1, further comprising the step of:
directing a low-pressure air blowing at the web at a low-pressure blowing region after said high-pressure blowing region in the direction of travel of the web to prevent passage and spreading of the separated dust.
directing a low-pressure air blowing at the web at a low-pressure blowing region after said high-pressure blowing region in the direction of travel of the web to prevent passage and spreading of the separated dust.
4. The method of claim 3, further comprising the step of:
directing said high-pressure blowing and said low-pressure blowing at the web at said high-pressure blowing region and said low-pressure blowing region, respectively, from a respective nozzle opening situated at a distance of about 2 mm to about 6 mm from the web.
directing said high-pressure blowing and said low-pressure blowing at the web at said high-pressure blowing region and said low-pressure blowing region, respectively, from a respective nozzle opening situated at a distance of about 2 mm to about 6 mm from the web.
5. The method of claim 3, further comprising the steps of:
measuring the distance between the web and a respective point from which said high-pressure blowing and said low-pressure blowing are directed at the web, and continuously regulating the distance between the web and the respective point from which said high-pressure blowing and said low-pressure blowing are directed at the web during the running of the web.
measuring the distance between the web and a respective point from which said high-pressure blowing and said low-pressure blowing are directed at the web, and continuously regulating the distance between the web and the respective point from which said high-pressure blowing and said low-pressure blowing are directed at the web during the running of the web.
6. The method of claim 3, further comprising the step of:
directing an additional blowing in the direction of travel of the web before said first suction region, and regulating the air flow of said high-pressure air blowing, said low-pressure air blowing and said additional blowing such that substantially only said additional blowing is directed at the web during tail threading of the web.
directing an additional blowing in the direction of travel of the web before said first suction region, and regulating the air flow of said high-pressure air blowing, said low-pressure air blowing and said additional blowing such that substantially only said additional blowing is directed at the web during tail threading of the web.
7. The method of claim 1, wherein said high-pressure blowing is directed at the web in a direction opposite to the direction of travel of the web at a velocity of about 150 m/s to about 200 m/s.
8. The method of claim 3, wherein said low-pressure blowing is directed at the web in a direction opposite to the direction of travel of the web at a velocity of about 30 m/s to about 50 m/s.
9. A device in a paper machine or in a finishing device of a paper machine for collecting and removing dust and other particles separated from a web, comprising a frame, said frame including a first, pressurized air chamber, first nozzle means for directing a high-pressure air blowing from said first chamber toward the web, said first nozzle means comprising a nozzle opening, and suction means for removing dust from the vicinity of the web, said suction means comprising at least one suction opening arranged before said nozzle opening in a direction of travel of the web and at least one suction opening arranged after said nozzle opening in the web travel direction.
10. The device of claim 9, wherein said frame further includes a second air chamber and second nozzle means for directing a low-pressure air blowing from said second chamber toward the web, said second nozzle means comprising a nozzle opening.
11. The device of claim 9, further comprising measurement and regulation means for measuring and regulating the distance between the device and the web such that the distance between the device and the web remains constantly at a desired level.
12. The device of claim 10, wherein said frame further includes a third air chamber having a nozzle opening through which air is blown toward the web in the direction of travel thereof during tail threading of the web.
13. The device of claim 9, wherein said frame comprises sheets of material and fastening means for interconnecting said material sheets to form said frame.
14. The device of claim 10, wherein said nozzle opening of said first nozzle means and said nozzle opening of said second nozzle means are slot nozzles and extend substantially across the entire width of the web.
15. The device of claim 9, further comprising a perforated plate situated in each of said suction openings to prevent access of chaffed paper into the device.
16. The device of claim 9, wherein said device comprises a plurality of blocks extending in a direction of width of the web such that the shape of the face of the device facing the web substantially conforms with any curve form of the web in the direction of width of the web.
17. The device of claim 10, wherein said first and second nozzle means direct said high-pressure air blowing and said low-pressure air blowing, respectively, in a direction opposite to the direction of travel of the web.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| FI942269A FI95611C (en) | 1994-05-16 | 1994-05-16 | Method and apparatus on a paper machine or finishing apparatus for such to collect and remove dust discharging from the web |
| FI942269 | 1994-05-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CA2149344A1 true CA2149344A1 (en) | 1995-11-17 |
Family
ID=8540706
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CA002149344A Abandoned CA2149344A1 (en) | 1994-05-16 | 1995-05-15 | Method and device for collecting and removing dust separated from a web in a paper machine |
Country Status (4)
| Country | Link |
|---|---|
| EP (1) | EP0682992A3 (en) |
| JP (1) | JPH07323208A (en) |
| CA (1) | CA2149344A1 (en) |
| FI (1) | FI95611C (en) |
Families Citing this family (16)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FI98389C (en) * | 1996-02-22 | 1997-06-10 | Valmet Corp | Method and apparatus for collecting and removing dust released from a web by a paper machine or similar or post-processing device |
| JP3122370B2 (en) * | 1996-05-29 | 2001-01-09 | 株式会社伸興 | Dust removal device |
| DE29618023U1 (en) * | 1996-10-17 | 1997-01-16 | Strauch Helmut | Device for cleaning the paper surface on a running paper web in a paper machine |
| FI104099B1 (en) * | 1996-10-25 | 1999-11-15 | Valmet Corp | Method and apparatus for depositing dust from the web in a paper machine or equivalent or a finishing device thereof |
| US6148831A (en) * | 1996-10-25 | 2000-11-21 | Valmet Corporation | Method for cleaning a web |
| AT404605B (en) * | 1997-03-14 | 1999-01-25 | Andritz Patentverwaltung | METHOD AND DEVICE FOR REDUCING DUST DEPOSITION ON A PAPER MACHINE DRYING HOOD |
| FI111475B (en) | 1997-09-24 | 2003-07-31 | Metso Paper Inc | Method and arrangement for controlling fog and dust in paper and board manufacturing and finishing |
| FI105052B (en) | 1998-07-08 | 2000-05-31 | Valmet Corp | Process for making paper, apparatus for carrying out the process and a paper product made by the process |
| DE10016822C2 (en) * | 2000-04-06 | 2002-08-01 | Koenig & Bauer Ag | Device for dedusting a web |
| JP4608797B2 (en) * | 2001-03-29 | 2011-01-12 | 日本製紙株式会社 | How to prevent streaks in coated paper |
| DE102005055312A1 (en) * | 2005-11-21 | 2007-06-06 | Hildebrand Systeme Gmbh | Extraction device for the removal of particles resulting from processing on moving material webs |
| JP5814902B2 (en) * | 2012-11-22 | 2015-11-17 | 株式会社伸興 | Dust remover |
| CN103286099A (en) * | 2013-06-19 | 2013-09-11 | 南京际华三五二一环保科技有限公司 | Automatic cleaning device of needle plate of needle machine |
| CN105964072B (en) * | 2016-06-23 | 2018-08-31 | 河北苹乐面粉机械集团有限公司 | A kind of horizontal flat cloth cylinder deduster |
| DE102019131799A1 (en) | 2019-11-25 | 2021-05-27 | Koenig & Bauer Ag | Processing machine with at least one cleaning device and method for cleaning |
| BR102021003880A2 (en) * | 2020-03-03 | 2021-09-14 | Canalair Service S.R.L. | SYSTEM FOR SUCTIONING DUST AND FIBRILL |
Family Cites Families (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3239863A (en) | 1963-08-19 | 1966-03-15 | Thomas A Gardner | Pressure gradient web cleaning apparatus |
| DE1786277A1 (en) * | 1968-09-10 | 1972-01-20 | Hans Gruenenfelder | Device for the electrostatic discharge of moving material webs and their simultaneous dedusting |
| SE319969B (en) * | 1969-02-14 | 1970-01-26 | Svenska Flaektfabriken Ab | |
| JPS51124059A (en) * | 1975-04-08 | 1976-10-29 | Turner Machinery Ltd | Apparatus for removing dust |
| DE2602236A1 (en) * | 1976-01-22 | 1977-07-28 | Maschf Augsburg Nuernberg Ag | DEVICE FOR CONTINUOUS DUST COLLECTION OF MATERIAL TRAILS |
| SE8107374L (en) * | 1981-12-09 | 1983-06-10 | Kelva Ab | web cleaners |
| EP0127618A1 (en) | 1982-11-29 | 1984-12-12 | HOWARD, Paul Clifford | Paperboard edge buffer and cleaner |
| GB2248583A (en) * | 1990-10-10 | 1992-04-15 | Moores J & C Ltd | Non-contact web cleaning apparatus. |
| JP2820599B2 (en) * | 1993-08-31 | 1998-11-05 | 株式会社伸興 | Dust removal device |
-
1994
- 1994-05-16 FI FI942269A patent/FI95611C/en active IP Right Grant
-
1995
- 1995-05-15 EP EP95850092A patent/EP0682992A3/en not_active Withdrawn
- 1995-05-15 CA CA002149344A patent/CA2149344A1/en not_active Abandoned
- 1995-05-16 JP JP7140059A patent/JPH07323208A/en not_active Withdrawn
Also Published As
| Publication number | Publication date |
|---|---|
| FI95611B (en) | 1995-11-15 |
| JPH07323208A (en) | 1995-12-12 |
| EP0682992A3 (en) | 1996-05-01 |
| FI95611C (en) | 1996-02-26 |
| FI942269A0 (en) | 1994-05-16 |
| EP0682992A2 (en) | 1995-11-22 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| FZDE | Discontinued |