EP4377057A1 - Mécanisme d'aspiration de poussière sur un dispositif de coupe rotatif - Google Patents

Mécanisme d'aspiration de poussière sur un dispositif de coupe rotatif

Info

Publication number
EP4377057A1
EP4377057A1 EP22757878.8A EP22757878A EP4377057A1 EP 4377057 A1 EP4377057 A1 EP 4377057A1 EP 22757878 A EP22757878 A EP 22757878A EP 4377057 A1 EP4377057 A1 EP 4377057A1
Authority
EP
European Patent Office
Prior art keywords
dust
paper web
dust extraction
cutting
air
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.)
Pending
Application number
EP22757878.8A
Other languages
German (de)
English (en)
Inventor
Daniel Gronych
Tobias HENLE
Klaus RADTKE
Stefan Hübner
Fabian Köberle
Marcus BRITZ
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Voith Patent GmbH
Original Assignee
Voith Patent GmbH
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Voith Patent GmbH filed Critical Voith Patent GmbH
Publication of EP4377057A1 publication Critical patent/EP4377057A1/fr
Pending legal-status Critical Current

Links

Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D7/00—Details of apparatus for cutting, cutting-out, stamping-out, punching, perforating, or severing by means other than cutting
    • B26D7/18—Means for removing cut-out material or waste
    • B26D7/1845—Means for removing cut-out material or waste by non mechanical means
    • B26D7/1863—Means for removing cut-out material or waste by non mechanical means by suction
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/141—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter for thin material, e.g. for sheets, strips or the like
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B26—HAND CUTTING TOOLS; CUTTING; SEVERING
    • B26D—CUTTING; DETAILS COMMON TO MACHINES FOR PERFORATING, PUNCHING, CUTTING-OUT, STAMPING-OUT OR SEVERING
    • B26D1/00—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor
    • B26D1/01—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work
    • B26D1/12—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis
    • B26D1/14—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter
    • B26D1/24—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter
    • B26D1/245—Cutting through work characterised by the nature or movement of the cutting member or particular materials not otherwise provided for; Apparatus or machines therefor; Cutting members therefor involving a cutting member which does not travel with the work having a cutting member moving about an axis with a circular cutting member, e.g. disc cutter coacting with another disc cutter for thin material, e.g. for sheets, strips or the like

Definitions

  • the invention relates to dust extraction on a cutting device for cutting a paper web along a running direction of the paper machine, in a rotary cutter, comprising at least one cutting blade and a discharge element for air containing dust.
  • DE 10204060849 B3 is known in the prior art, which blows cutting dust from the cutting point by means of a flow channel.
  • the air is accelerated here before and during the cutting process, so that air containing dust can escape in the area of the blade.
  • a diverting element is shown, which is arranged immediately after the cutting blade. The flow channel is closed to the paper web except for an opening in the immediate area of the blade.
  • the object of the invention is to largely collect cutting dust that occurs on a rotary cutter and to efficiently remove it from the paper web.
  • the object of the invention is thus to reduce the burden on the environment and technology caused by cutting dust.
  • Dust extraction is also advantageous, with the shielding having a length of 15 mm to 150 mm in the running direction of the paper web in the area between the cutting blade and the deflecting element, with the shielding having a cover in this area.
  • the suction zone still has a length of at least 20 mm to 250 mm after the cutting process, since in the suction zone the cut dust can be detached from the web by a suitable air flow and fed to the deflection element.
  • the winder is usually operated at speeds of 20 m/s to 60 m/s, the geometry of the shielding and the length of the extraction zone are important for effective dust extraction.
  • a defined air flow along the running direction of the paper machine (MD) is also made possible by an air inlet before the cutting process. The resulting cutting dust can thus follow the air flow until it reaches the discharge element.
  • the cutting process is the area in which the paper web with the cutting blade is in contact. Dust extraction is particularly effective when the area of the extraction zone after the cutting process is between 100 mm and 150 mm. The effectiveness of the dust extraction can also depend on the speed of the paper web. An optional option for adjusting the length of the extraction zone is therefore advantageous.
  • Dust extraction is also advantageous, with the cross-sectional area of the shielding in the area of the air inlet being larger than the cross-sectional area of the shielding in the area of the extraction zone, so that the air flowing in is accelerated in the area of the extraction zone.
  • a narrowing of the cross-sectional area results in an acceleration of the air in the shield.
  • the distance between the shield and the paper web being less than 20 mm, preferably less than 15 mm and in particular less than 10 mm, the shield being the
  • Suction zone shields parallel to the running direction of the paper machine and transverse to the running direction in front of and behind the cutting blade from the ambient air.
  • a small distance between dust extraction and paper web is important to reduce the escape of dust-containing air into the environment. In tests, a distance between 3 mm and 12 mm has proven to be particularly effective. It is also advantageous if the wall of the shield directly opposite the Paper web has a thickness of 3 mm to 20 mm and has a flat surface in relation to the paper web. A flow resistance can thus reduce an exchange of air with respect to the environment.
  • a dust extraction system is also advantageous, with the distance between the shielding and the paper web being 2 mm - 25 mm, preferably 3 mm to 10 mm, with the paper web having a speed of 20 m/s to 60 m/s, with the Cutting process an inflow route with a length of 150 mm to 1500 mm is arranged.
  • a dust extraction system is also advantageous, with the shielding comprising a scraper blade which is suitable for diverting the flow of dust-containing air from the paper web and feeding it to the diverting element, with the scraper blade being able to be designed to be adjustable in position.
  • the air flow conditions around the cutting process can change with different production speeds and paper properties.
  • basis weight and roughness can have an influence on the air boundary layer that is carried along and/or the fluttering behavior of the paper web.
  • Adjustment of the precise position of the scraper blade is advantageous in order to set the optimal point for the flow division of the dust-containing air towards the deflector.
  • the length of the extraction zone can also be defined by adjusting the scraper blade.
  • the scraper blade itself can have a sharp blade, or have a radius of less than 5 mm, in particular less than 2 mm and particularly advantageously between 0.5 and 1.5 mm, on the flow-separating edge.
  • the radius and the resulting rounding at the flow-dividing edge can help to ensure that individual fibers do not get caught on the scraper blade. Also advantageous is a dust extraction, wherein the discharge element has a volume flow of 0.5 m 3 / min to 5 m 3 / min of dust-containing air from the area of the suction zone and/or the shielding, whereby part of the air flow can also be directed through the blade housing.
  • the effect of the advantageous volume flow determined experimentally is that the flow speed is high enough so that dust does not settle on the walls of the discharge element.
  • the air usually has a temperature of 10° C. to approx. 50° C. and an absolute pressure of 0.7 bar to 1.3 bar is usually set in the discharge element and suction zone.
  • the pressure can vary in individual sections of the dust extraction due to the geometry.
  • Another so-called bypass line can also build up a suction effect in the blade housing in order to reduce the accumulation and/or escape of dust particles there as well.
  • Dust extraction is also advantageous, with the discharge element being connected to a blower and being able to suck off the dust-containing air via a negative pressure compared to the ambient pressure, with the negative pressure being able to be regulated and/or controlled.
  • Controlling and/or regulating the air pressure in the dust extraction system is important for optimum dust extraction efficiency. If too little dust-containing air is extracted, dust escapes from the cutting process, if too much dust-containing air is extracted, web travel can be disrupted, for example.
  • the extracted dust-containing air and the pressure in the dust extraction can be adjusted manually. The visual impression of the suction effect and the web run can be decisive for the setting. Automatic control can also be done by measuring the distance between the paper web and the dust extraction system. Other measured variables, such as the pressure in the diverting element or the speed of the paper machine, can also be used for pressure regulation.
  • Dust extraction is also advantageous, with the blade housing and/or the extraction zone being accessible by means of a folding device.
  • a folding device for Cleaning, maintenance work and blade replacement is advantageous for dust extraction.
  • a two-part design can be advantageous here, since the position of the dust extraction is adjusted according to other criteria than the cutting blade.
  • the cutting blade is positioned depending on the desired depth of cut and the size of the cutting blade.
  • the size of the cutting blade can also vary due to wear and the number of sharpenings. Positioning as evenly as possible close to the paper web is advantageous for dust extraction, so that the air flow ensures effective dust extraction.
  • Dust extraction is also advantageous, with air nozzles being integrated into the shielding, which are suitable for keeping the distance between the paper web and the shielding constant and, in particular, for avoiding contact with the paper web on the shielding.
  • Dust extraction is also advantageous, with the shielding comprising at least one air nozzle which is arranged behind the scraper blade in the running direction of the paper web and which, by blowing out air, prevents the scraper blade from being touched by the paper web.
  • An air nozzle behind the scraper blade is advantageous, as this allows an air cushion to be formed on which the paper web slides close to the scraper blade without touching it. Furthermore, the blowing out of air can whirl through the laminar boundary air layer here, and thus ensure that the dust-containing air is sucked off with the diverting element.
  • the air nozzle after the cutting blade is particularly advantageous, since the dust extraction in the discharge element sucks in the dust-containing air by means of negative pressure, so that there is negative pressure in the suction zone the ambient pressure arises.
  • the paper web is also sucked in, and in particular in the area of the suction zone that has a cover between the cutting blade and the diverting element, a suction is created that can move the paper web against the scraper blade.
  • the integration of compressed air nozzles directly into the shielding of the dust extraction has two beneficial effects:
  • the paper web can be prevented from touching the shielding and the web run can be stabilized even with a higher vacuum in the extraction section.
  • the air nozzles can also improve the effectiveness of dust extraction.
  • the air nozzles can be integrated directly into the shielding or attached separately to the shielding from the outside. In practice, flat nozzles that can form a closed air curtain have proven particularly effective. But even with a large number of smaller nozzles, the escaping dust could be significantly reduced.
  • the air nozzles are supplied with compressed air or instrument air from an air distributor.
  • the air distribution includes compressed air lines and/or hoses and optional connection devices and/or valves for connection to a compressed air supply.
  • the air distribution can also be integrated directly, at least partially, into the shielding.
  • the integration of air nozzles and/or air distribution into the shielding can advantageously take place by means of additive manufacturing methods, in particular using 3D printing methods.
  • a cutting device with a dust extraction system with support elements being arranged on the side of the paper web facing away from the cutting blade, which stabilize the position of the paper web and reduce contact between the paper web and the shield, with the support elements also being able to include air nozzles.
  • support elements can advantageously be used. These support elements are already attached other places in the paper machine and also called foil strips.
  • the support elements can support targeted airflow and reduce web flutter.
  • Support elements can also include ventilation elements and air nozzles in order to build up targeted air cushions or air currents for web stabilization.
  • a cutting device with dust extraction is also advantageous, with a pot knife or another cutting blade being arranged as a counter-blade on the side of the paper web facing away from the cutting blade.
  • a pot knife or another cutting blade being arranged as a counter-blade on the side of the paper web facing away from the cutting blade.
  • a cutting device with a dust extraction system, with a further dust extraction system being arranged on the side of the paper web facing away from the first cutting blade, the shielding of this additional dust extraction system having an enlarged opening for the counter-blade.
  • a cutting device with dust extraction the cutting blade and dust extraction and, if present, the counter-blade and additional dust extraction being adjustable in their position in the transverse direction of the paper machine (CD), the adjustment also being automatic.
  • a plurality of cutting blades are usually arranged in roll cutters, these being designed to be adjustable can.
  • the adjustment can take place automatically or manually during set-up times. If the position of the cutting device is adjusted with a dust extraction system, the discharge elements must be tracked using flexible lines. In this case, central air ducts with corresponding coupling elements for connection to the diverting elements can also be used. In this way, the dust-containing air can always be transported to a filter device by means of a blower unit, without dust escaping.
  • Part of the automatic adjustment of the cutting blades can also include opening or retracting the blades in order to interrupt or restart the cutting process
  • a rotary cutter comprising at least one dust extraction system, the dust extraction system being connected to a blower unit and a filtering device which is suitable for discharging the dust-containing air and separating the dust contained therein.
  • a rotary cutter comprising at least two dust extraction systems, with a plurality of cutting devices each comprising at least one dust extraction system being arranged across the transverse direction of the paper machine (CD), the dust extraction systems being connected via a common exhaust air duct.
  • a common exhaust air duct is advantageous.
  • the common exhaust air duct can transport the dust-containing air away from the cutting devices centrally by means of a blower and vacuum. It is advantageous if the discharge elements are compactly connected to the exhaust air duct. In this way, the installation space can be used favorably and good suction can be achieved.
  • the connection point between the deflection element and the exhaust air duct is to be designed to be flexible in order to enable the position of the cutting device to be adjusted. The connection point can be closed, for example, by means of an automatically detachable coupling and/or seal.
  • a method for cutting a paper web comprising at least one dust extraction system in a rotary cutter by means of at least one cutting device, the dust-containing air being accelerated in a suction zone during and immediately after the cutting process, being shielded from the environment by means of a shield and in a deflection element is derived from the paper web.
  • Tests on this invention have shown that accelerating the dust-containing air in the area of the suction zone significantly improves the effectiveness of the dust suction. Dust particles can be accelerated in this way and are detached from the paper web. Even with high production speeds, it is important to consider the flow conditions at the suction. In this way, the dust-containing air under the shielding in the extraction zone can be safely and largely completely routed to the discharge line.
  • the scraper blade and the position of the scraper blade can also advantageously direct the flow here and enable long-range capture of the cutting dust.
  • FIG.1 Partial sectional view of dust extraction Fig.2 Cutting device with dust extraction Fig.3 Cutting device with straight dust extraction Fig.4 Cutting device with further dust extraction
  • FIG. 1 shows a partial sectional view, not to scale, of a cutting device 2 with dust extraction 1 according to an aspect of this invention.
  • the paper web 3 is fed to the cutting device 2 in the illustration from left to right in the running direction of the paper machine MD. With the paper web 3, air also enters the cutting device 2 and dust extraction 1 via the air inlet 10.
  • the paper web 3 is cut by the cutting blade 4 during the cutting process 9.
  • the blade housing 5 is optionally designed as a structural unit with the shielding 8 .
  • the shield 8 shields the suction zone 11 from the environment both above the paper web 3 and laterally in front of and behind the cutting blade 4 in the transverse direction of the paper machine CD.
  • Air 7 containing dust can thus be fed to the discharge element 6 and sucked out of the paper machine by a blower unit 18 (not shown).
  • the dust-containing air 7 in this case contains at least ambient air that was supplied to the cutting device 1 via the air inlet 10 and dust that arises during the cutting process 9 .
  • the diverting element 6 and the following exhaust air duct which is not illustrated, are shaped in an advantageous manner in terms of flow technology, in particular edges and projections, such as screws, are to be avoided since dust particles can settle on them.
  • the shielding 8 is fluidically shaped in such a way that the dust-containing air 7 can be accelerated in order to then be diverted in the direction of the deflection element 6 by means of the scraper blade 12.
  • the scraper blade 12 can have a sharp blade, for example, or have a radius of less than 3 mm on its flow-dividing edge.
  • the scraper blade can be made of a hard material to withstand wear from paper dust or possible contact with the paper web longer.
  • the scraper blade 12 can be made of metal, in particular hardened steel, or made of a ceramic material.
  • FIG. 2 shows a partial sectional illustration, not to scale, of a cutting device 2 with dust extraction 1 according to a further aspect of this invention.
  • the representation is characterized above all by the fact that the dust extraction system 1 and is constructed separately from the blade housing 5 .
  • the cutting device 2 comprises at least one cutting blade 4 , the blade housing 5 and the dust extraction 1 .
  • the dust extraction 1 comprises an air inlet 10 and a shield 8 which is connected to a discharge element 6 .
  • the shielding 8 is designed so long in the running direction of the paper machine MD that the suction zone 11 can be shielded.
  • the shield 8 has a slit through which the cutting blade 4 reaches the paper web 3 .
  • a scraper blade 12 is integrated into the dust extraction system 1 .
  • the distance A between the dust extraction 1 and the paper web 3 is adjustable. In this arrangement, a distance A in a range from 2 mm to 20 mm is advantageous, in particular between 2 mm and 10 mm, since air 7 containing particularly little dust can escape from the dust extraction system 1 and/or shield 8 in this way.
  • Air 7 containing dust can thus be fed to the discharge element 6 and sucked out of the paper machine by a blower unit 18 (not shown).
  • the diverting element 6 and the following exhaust air duct which is not illustrated, are shaped in an advantageous manner in terms of flow technology, in particular edges and projections, such as screws, are to be avoided since dust particles can settle on them.
  • the shielding 8 is fluidically shaped in such a way that the dust-containing air 7 can be accelerated and then diverted in the direction of the deflection element 6 by means of the scraper blade 12.
  • the acceleration of the dust-containing air 7 in the area of the suction zone 11 takes place in particular by reducing the cross-sectional area of the shielding 8.
  • the acceleration and pressure conditions in the suction zone 11 can also be adjusted by regulating the air pressure in the area of the discharge element 6 .
  • the shielding 8 can advantageously include air nozzles 21 (not shown in the figure) suitable for keeping the paper web at a defined distance from the shielding 8.
  • support elements 14 can also stabilize the running of the paper web 3 . This stabilization of the paper web can be done by direct contact of the support elements 14 on the paper web 3, or without contact by a suitable air duct on the side facing away from the dust extraction 1 of the
  • the scraper blade 12 can have a sharp blade, for example, or have a radius of less than 3 mm on its flow-dividing edge.
  • the scraper blade can be made of a hard material to withstand the wear caused by the paper dust or eventual
  • Figure 3 shows a not to scale partial sectional view of a
  • Cutting device 2 with dust extraction 1 according to another aspect of this invention.
  • the representation is characterized in that the dust extraction device 1 and is constructed separately from the blade housing 5, the shielding 8 being constructed in a cost-effective manner straight and parallel to the running direction of the paper machine MD.
  • the dust-containing air 7 in the area of the suction zone 11 can be accelerated here by regulating the pressure in the discharge element 6 .
  • the distance A between paper web 3 and shielding 8 or scraper blade 12 can also be kept constant via air distributions 20 and air nozzles 21 (not illustrated) without the paper web 3 touching dust extraction 1. Possible embodiments for this detail can be found in FIG. 5 in a detail section BB.
  • the position of the scraper blade 12 can be adjusted.
  • FIG. 4 shows a partial sectional illustration, not to scale, of a cutting device 2 with dust extraction 1 and a further dust extraction T according to a further aspect of this invention.
  • the dust extraction 1 and the further dust extraction T are advantageously arranged on both sides of the paper web 3 so that cutting dust produced on both sides can be extracted.
  • a counter-blade 16 is arranged opposite the cutting blade 4 and is optionally designed as a pot knife 15 .
  • the shielding 8 of the additional dust extraction device 1' has an opening through which the pot knife 15 can be positioned.
  • the blade housing 5 and the further dust extraction T are separately, or to design the blade housing 5 with the further dust extraction T in one structural unit (not illustrated).
  • the embodiment is advantageous if the dust extraction system 1 and the additional dust extraction system T are largely mirror-symmetrical to the surface of the paper web 3 .
  • the pressure conditions in the suction zone 11 on both sides of the paper web 3 can be regulated uniformly via a largely mirror-symmetrical structure, so that the paper web 3 is stabilized.
  • it is possible to set the acceleration of the dust-containing air 7 by regulating the amount of exhaust air and/or the pressure in the discharge elements 6 .
  • FIG. 5 shows two detailed sectional representations, not to scale, according to image section BB of a cutting device 2 with dust extraction 1 according to further aspects of this invention.
  • the shielding 8 is arranged around the cutting process 9.
  • FIG. The shielding 8 is arranged at a distance A close to the surface of the paper web 3 .
  • a distance A that is selected to be small is advantageous here, in particular less than 15 mm, particularly advantageously between 5 mm and 10 mm, so that only a small amount of dust-containing air can escape from the shielding.
  • air nozzles 21 are integrated into the shielding 8 and are supplied with compressed air or instrument air via an air distributor 20 .
  • the distance A can be set directly by regulating the compressed air in the air distribution 20 and air nozzle 21, and the effectiveness of the dust extraction 1 (or the other Dust extraction 1') can be improved.
  • the shielding 8 can advantageously be produced in an additive process such as 3D printing, in which case the air distribution 20 and air nozzles 21 can be easily integrated into the shielding 8 .
  • the air nozzles 20 can also be arranged separately next to the shielding, with the air distribution 21 being able to take place via commercially available pressure hoses or pressure lines.
  • the shield 8 can be made of plastic, whereby it can be advantageous to use a harder material on the underside in order to reduce wear due to friction on the paper web 3. In this case, a metal material or ceramic material can be used on the underside.
  • FIG. 6 shows a schematic, not to scale, partial sectional illustration of a dust extraction system 1 with features of the invention.
  • the paper web 3 is guided through the cutting device 2 at a high speed of usually 20 m/s to 60 m/s and is cut by the cutting blade 4 along the running direction of the paper machine MD.
  • the paper web 3 builds up a laminar boundary layer of air over an inflow stretch 23, the air being accelerated in this way in the area of the air inlet. Further air turbulence and/or air currents in the direction of the deflection element 6 arise via the cutting blade 4, which moves in the area of the cutting process 9 in the running direction of the paper machine. Cutting dust is produced in the area of the cutting process 9 .
  • the suction zone 11 includes the area of the cutting process 9 and the downstream area of the shielding 8 , which has a cover 23 .
  • the dust-containing, accelerated air 7 is sucked off via the discharge element 2 by means of a scraper blade 12 .
  • a negative pressure can arise, which pulls the paper web 3 against the shielding 8.
  • an optional air nozzle 21 with air distribution 20 is arranged after the scraper blade 12 in this illustration, which uses blown air to form an air cushion that pushes the paper web 3 away from the scraper blade 12.
  • the air nozzle 21 can thus ensure that the distance A between dust extraction 1 and paper web 3 is advantageously set between 2 mm and 10 mm.
  • the dust extractor 1 is mounted independently of the cutting device 2, so that the cutting blade 4 can be adjusted in height independently of the dust extractor 1.
  • the cutting depth can be adjusted in such a way that a clean cut occurs.
  • an inflow route 22 is arranged before the cutting process 9.
  • the inflow path 22 starts when the direction of the web changes, for example when there is a backup or reversing roll.
  • the inflow section 22 allows the build-up of a laminar boundary layer of air on the surface of the paper web. This boundary layer of air is advantageous because cutting dust is picked up in the layer of air and is carried along.
  • the laminar boundary air layer is only interrupted by the cutting blade 4 at the end of the inflow route 22 .
  • the shielding is only arranged parallel to the cutting blade 4 in the area of the cutting process 9, but can be supported by struts or brackets, not shown in the figure.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Forests & Forestry (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Details Of Cutting Devices (AREA)
  • Advancing Webs (AREA)

Abstract

L'invention se rapporte à un mécanisme d'aspiration de poussière (1) sur un dispositif de coupe (2) servant à couper une bande de papier (3) le long d'une direction de déplacement de la machine à papier (MD), dans une détoureuse rotative (17), comprenant au moins une lame (4) et un élément d'évacuation (6) destiné à l'air contenant de la poussière (7) ; une protection (8) est disposée entre la lame (4) et l'élément d'évacuation (6), ladite protection (8) protégeant une zone d'aspiration (11) et étant reliée à l'élément d'évacuation (6).
EP22757878.8A 2021-07-29 2022-07-26 Mécanisme d'aspiration de poussière sur un dispositif de coupe rotatif Pending EP4377057A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021119691.4A DE102021119691A1 (de) 2021-07-29 2021-07-29 Staubabsaugung am Rollenschneider
PCT/EP2022/070895 WO2023006717A1 (fr) 2021-07-29 2022-07-26 Mécanisme d'aspiration de poussière sur un dispositif de coupe rotatif

Publications (1)

Publication Number Publication Date
EP4377057A1 true EP4377057A1 (fr) 2024-06-05

Family

ID=83006081

Family Applications (1)

Application Number Title Priority Date Filing Date
EP22757878.8A Pending EP4377057A1 (fr) 2021-07-29 2022-07-26 Mécanisme d'aspiration de poussière sur un dispositif de coupe rotatif

Country Status (3)

Country Link
EP (1) EP4377057A1 (fr)
DE (1) DE102021119691A1 (fr)
WO (1) WO2023006717A1 (fr)

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IT1292415B1 (it) 1997-06-25 1999-02-08 Fabio Eugenio Malnati Dispositivo di depolverizzazione particolarmente adatto per la eliminazione dei residui polverulenti prodotti durante il taglio
SE518762C2 (sv) 1998-12-23 2002-11-19 Allan Person Handels Ab Förfarande och anordning vid skärning av materialbanor
EP1334936B1 (fr) 2002-02-11 2005-05-04 Bielloni Castello S.p.A. Système de coupe et d'expulsion pour les chutes de rive qui sont générés par le découpage longitudinal d'un film ou d'une bande de matériau plastique dans un bobinoir pour la formation de rouleaux
DE102004060849B3 (de) 2004-12-17 2006-04-06 Hildebrand Systeme Gmbh Vorrichtung zur Entfernung von Bearbeitungsstaub, insbesondere Schnittstaub
DE102005055312A1 (de) 2005-11-21 2007-06-06 Hildebrand Systeme Gmbh Absaugvorrichtung zur Entfernung von bei Bearbeitungen an bewegten Materialbahnen entstehenden Partikeln
JP5380956B2 (ja) 2008-08-28 2014-01-08 富士通株式会社 基板固定パレット及び基板加工装置
DE102012108198B4 (de) 2012-09-04 2016-05-25 Windmöller & Hölscher Kg Vorrichtung zum Absaugen von Abfallprodukten einer Produktionsmaschine mit einem Absaugelement
DE102018113558A1 (de) * 2018-06-07 2019-12-12 Voith Patent Gmbh Längsschneideeinrichtung zum Schneiden einer laufenden Materialbahn

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