EP2998052A1 - Procede et dispositif de revetement de surface etroite de demi-produits en forme de plaque ou de pieces a usiner - Google Patents

Procede et dispositif de revetement de surface etroite de demi-produits en forme de plaque ou de pieces a usiner Download PDF

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Publication number
EP2998052A1
EP2998052A1 EP15186320.6A EP15186320A EP2998052A1 EP 2998052 A1 EP2998052 A1 EP 2998052A1 EP 15186320 A EP15186320 A EP 15186320A EP 2998052 A1 EP2998052 A1 EP 2998052A1
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EP
European Patent Office
Prior art keywords
carbon dioxide
plate
air
narrow
shaped semi
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EP15186320.6A
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German (de)
English (en)
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EP2998052B1 (fr
Inventor
Roland Geitel
Steffen Nitschke
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Geitel Roland
Nitschke Steffen
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Geitel Roland
Nitschke Steffen
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Priority to PL15186320T priority Critical patent/PL2998052T3/pl
Publication of EP2998052A1 publication Critical patent/EP2998052A1/fr
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/003—Other working of veneer or plywood specially adapted to veneer or plywood securing a veneer strip to a panel edge
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists

Definitions

  • the invention relates to a method and a device for narrow-surface coating of plate-shaped semi-finished products or workpieces.
  • Plate-shaped semi-finished products made of wood or wood-based materials, such as chipboard or medium-density fiberboard, are used in industry u. a. used for the production of inexpensive furniture panels for living and kitchen furniture.
  • the plate-shaped semi-finished products have a thickness between 16 mm and 100 mm depending on the mechanical load of the future furniture panel.
  • the two top surfaces of the plate-shaped wood material are coated with a top layer of small thickness of wood material, veneer, foil, plastic or metal. The conclusion of the narrow surfaces on the outer end-side circumference of the provided with cover layers wood materials is carried out regularly by a narrow-surface coating.
  • a “narrow-surface coating” or an “edge material” is understood to mean a rod-shaped or band-shaped coating material made of plastic, paper, wood, wood veneer or other suitable materials, which is the form-fitting veneering of the frontal narrow-surface region between the two outer layers of a coated one Wooden board serves.
  • Common narrow-surface coatings consist of PVC, ABS, PP, melamine, paper, aluminum, wood veneer or solid wood and are generally used in thicknesses of 0.25 mm to 4 mm.
  • the application of the narrow surface coating on the frontal narrow surface of the plate-shaped wood material is usually by gluing with a fast-curing binder, such as a hot melt adhesive, which produces a material connection between the, not visible after bonding underside of the narrow surface band and the surface of the front side of the plate-shaped wood material ,
  • Kantenanleimmaschinen or processing systems are used depending on the number / lot size and the dimensions of the plates to be processed, in which already coated with two cover layers wood board passes through several workstations in which the surface of the plate formatted and is coated. Initially, the still uncoated narrow surface of the already coated with the two cover layers plate is machined by cutting tools, such as cutters or saws to the desired shape and size.
  • the adhesive As a hot melt, applied to the narrow surface of the plate to be coated. Preference is given to using hot melt adhesives based on polyurethane. For narrow surface bands with already applied hotmelt adhesive, the adhesive is activated by hot air nozzles or plasma lasers.
  • the supply of the applied narrow-surface material which is usually stored as a belt / Keul or magazine.
  • the front edge of the edge material is joined together at the front edge of the wood-based panel provided with the cover layers and formatted.
  • the edge materials are adapted to the workpiece thickness of the plate.
  • the width of the narrow surface band is regularly selected larger than the desired thickness of the coated material plate. In general, a two-sided supernatant of about 2 to 3 mm is selected, which is removed in a later stage, together with excess adhesive, by cutting. This is to a uniform and tight completion of the joint connection can be realized.
  • the narrow-surface material is separated at the end of the plate. This is usually done with a small protrusion on the front and rear edges of the plate.
  • the tape After application of the narrow band, the tape is pressed by a plurality of pressure-loaded pressing elements, such. B. pressure rollers or pressure shoes, pressed onto the narrow surface of the plate.
  • a plurality of pressure-loaded pressing elements such. B. pressure rollers or pressure shoes, pressed onto the narrow surface of the plate.
  • the hot melt adhesive between edge material and the narrow surface of the plate is compacted.
  • the viscosity of the adhesive used is very low in this phase, so that it comes regularly despite the use of cooled pressure elements to leakage of the hot melt adhesive on the surfaces of the plate.
  • a liquid separating or cooling agent is sprayed onto the surface of the narrow-area material, whereby the hot-melt adhesive solidifies faster.
  • the liquid separating or cooling agent is intended to prevent the chips from adhering to the workpiece as a result of the electrostatic charging during the subsequent cutting processes.
  • Such liquid coolant are from the DE 100 42 431 C1 known.
  • the supernatant of an edge band is milled off by means of an edge band milling cutter.
  • the electrostatic charge of the wetted areas and / or the milling chips preventing release agent applied. This should be achieved that the resulting chips are better removed, so that the further processing is simplified after Kantenbandanleimen.
  • the resulting milling chips can be better removed by suction because they no longer adhere to the plate surface or the edge band.
  • the agent used consists of a mixture of water, alcohol and surfactant.
  • the hot melt adhesive is applied to the uncoated edge region of the plate element and the, held on a roll edged edge strip with a slight excess with its adhesive side pressed against the adhesive-coated edge region of the plate member.
  • the, emerging from the adhesive joint during the setting process as a result of the applied pressure adhesive and the excess of the edge strip of the edge portions of the plate member at the top and / or bottom is removed by machining.
  • a substance is applied to the edge areas of the top and / or bottom of the plate member prior to the setting process of the adhesive, which disables the, exiting from the glue joint excess adhesive residues in their adhesion, so that form non-sticking adhesive particles, the removal of the protruding edge strip from the edge area to be removed.
  • the substance is applied in strips on the edge areas of the top and bottom.
  • the substance used consists of a water-dispersed, polymeric fluid.
  • liquid separating or cooling agent is from the DE 10 2007 014 832 B3 a method for the narrow-surface coating of plates with a core layer of low density, in which the binder (hot melt adhesive) is cooled by blowing air onto the already bonded edge band or by a running metal rail.
  • a disadvantage of the air cooling is the low efficiency, which does not allow sufficient cooling at high working and feed speeds of the plates to be processed at the maximum allowable flow velocity at the plants. The same applies to the alternative use of known air-cooled rails.
  • edge banding machines or processing systems are increasingly being used, which enable feed rates of the plate-shaped semi-finished products of up to 300 m / min.
  • the quality (appearance, feel, function) of the plates provided with these narrow-surface coatings must meet the demands of the market.
  • the object of the invention is to eliminate the disadvantages of the prior art and to provide a method and apparatus for narrow-surface coating of a plate-shaped semifinished product or workpiece in mass production and mass production, the quality of processing narrow-area materials, in particular small thickness, with respect to the State of the art allow significantly higher feed rates.
  • the process should be able to be used at comparable unit costs on known Kantenanleimmaschinen or processing systems without significant changes in the technological process must be made.
  • the cost-intensive and quality-endangering use of liquid coolants should be completely eliminated.
  • the prepared narrow surface by means of a hot melt adhesive, which directly or indirectly heated and with the applied thin surface material is connected under the action of pressure and temperature and the narrow surface and the adjacent cover layers of the plate-shaped semi-finished machined, before and / or after and / or after a machining at least the machined or machined areas of the plate-shaped semifinished product by a flow of liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air cooled.
  • connection of the narrow surface with the narrow-surface material by means of the hot-melt adhesive is realized by means of known methods.
  • the hot melt adhesive can be cold on the prepared narrow surface and then heated or hot applied to the prepared narrow surface and possibly reheated.
  • the hotmelt adhesive may also be applied hot or cold to the narrow-area material or may already be integrated in the narrow-area belt, wherein at least the cold hot-melt adhesive is still heated to produce a connection with the narrow area. It is also possible to introduce hot melt adhesive into the material of the plate-shaped semifinished product or workpiece, which then melts upon heating of the semifinished product in the area of the narrow surface and realizes an adhesive connection with the narrow-area material.
  • a flow of liquid and / or gaseous carbon dioxide or a mixture of liquid and / or gaseous Exposed to carbon dioxide and air is preferably realized by the conversion of liquid carbon dioxide into gaseous carbon dioxide.
  • other areas of the semifinished product and the tools used or parts thereof by the same flow of liquid and / or gaseous carbon dioxide or a mixture of liquid and / or gaseous carbon dioxide and air or by a flow of the fully converted by phase conversion of carbon dioxide or a mixture of gaseous carbon dioxide and air are cooled.
  • the liquid carbon dioxide is preferably introduced in a line directly to the area to be cooled of the semifinished product or tool, the carbon dioxide a Pressure between 5.6 MPa to 8 MPa (56 bar to 80 bar) at an ambient temperature between 20 ° C and 40 ° C.
  • the liquid carbon dioxide preferably exits from a punctiform or area-effect nozzle into the immediate surrounding area of the area of the semifinished product or tool which, for example, has normal pressure, so that the liquid carbon dioxide is converted into gaseous carbon dioxide and expanded. Both physical effects overlap and lead to the strong cooling effect.
  • the cooling capacity is determined mainly by the amount of carbon dioxide exiting, ie by the volume flow of the liquid carbon dioxide. If only a small cooling capacity, but a high volume flow of fluid impinging on the semifinished product is needed, the liquid carbon dioxide can be mixed with an additional gas, for example. Air or gaseous carbon dioxide.
  • the additional gas can be admixed in a closed mixing chamber, ie, before the liquid carbon dioxide exits into the surrounding region of the region of the semifinished product to be cooled, or directly into the surrounding region of the region of the semifinished product to be cooled.
  • the additional gas preferably has the same pressure as the liquid carbon dioxide, but may also be applied with a different pressure.
  • the pressure of the additional gas and its temperature are preferably selected so that the phase transformation of the liquid carbon dioxide into gaseous carbon dioxide does not take place or not yet completely in the closed mixing chamber.
  • a complete phase transformation of the liquid carbon dioxide into gaseous carbon dioxide in the closed mixing chamber is also possible.
  • the mixing ratio of liquid carbon dioxide and additional gas is determined by the volume flow and temperature of the mixed fluid required in the area to be cooled of the semifinished product and can be between 1: 600 to 1: 6000, the first number being the volume of the liquid carbon dioxide in liters and the second number indicates the volume of additional gas in liters.
  • any or all workstations at which by the machining or by other, heat generating tools or machine elements, a significant heat input into the joint zone of Narrow surface material and the plate-shaped semifinished product or workpiece takes place to cool temporarily and locally targeted.
  • volume flow and / or its Temperature of the temperature profile in the joining zone to the physical and chemical properties of the adhesive used as well as to the technological processing conditions of the production (feed rate of edgebander, speed of the cutting tools, etc.) can be adjusted.
  • a laminar flow of gaseous carbon dioxide or a mixture of carbon dioxide and air is used for the cooling of individual or all relevant workstations.
  • the temperature profile in the joining zone and in particular in the adhesive layer can be discretely influenced temporarily and locally.
  • a turbulent, in particular a pulse-like flow of gaseous carbon dioxide or a mixture of carbon dioxide and air is used for cooling individual or all relevant workstations.
  • a significant advantage of liquid or gaseous carbon dioxide or a mixture of carbon dioxide and air as a coolant is the high availability of carbon dioxide on the one hand in the air, from which the carbon dioxide is removed and liquefied and in which it can be released after use (balanced carbon dioxide). Balance sheet), and on the other hand as a waste product of the chemical industry and the resulting low operating costs.
  • carbon dioxide acts flame-retardant, so that it can be used preferably and safely even in places with a fire hazard (use of lasers to heat the joint zone).
  • a fire hazard use of lasers to heat the joint zone.
  • Another advantage of using liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air as a coolant is the chemical inactivity, so that there is no adverse effect on the plate-shaped semifinished product, the hot melt adhesive or the narrow surface coating.
  • the method can preferably also be used in edge banding machines and processing systems in which the activation of the hot melt adhesive takes place by laser or hot air nozzles.
  • the present after the phase transformation gaseous carbon dioxide or the mixture of gaseous carbon dioxide and air has - depending on the mixing ratio - a, compared to the ambient temperature, low temperature in the range of -78 ° C to + 30 ° C and can thus for the cooling Further areas of the semifinished product, for example.
  • the top surfaces of the plate-shaped semifinished product, the tools and workstations or the environment of the workstations are used.
  • the thermal loads on the tools and workstations and the effects of fluctuations in the environmental conditions of the workstations can be minimized to the processing of the semifinished product.
  • the mixture of carbon dioxide and air which is present after the cooling of the narrow surface areas of the semifinished product, for. B. sucked by a suction device of the workstation and used to cool the engine or other, thermally loaded device of the workstation.
  • the inventive device for narrow-surface coating of plate-shaped semi-finished products or workpieces made of wood materials with a Kantenanleimaschine or a processing system in which applied to the prepared narrow surface a hot melt adhesive and heated directly or indirectly, the applied narrow-surface material with the narrow surface of the formatted plate-shaped semi-finished product under the influence of pressure and Temperature connected and the narrow surface and the adjacent cover layers of the plate-shaped semi-finished machined, has means which are suitable before and / or during and / or after a machining at least the machined or machined areas of the joined plate-shaped semi-finished by a Flow of liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air to cool.
  • the device comprises means for the passage and supply of the liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air, which means as media lines with a point or area acting nozzle, a perforated pinch roller, a pressure shoe, an air shower or an air curtain formed are.
  • a tool preferably a cutting tool
  • the processing area of the tool can be cooled particularly intensively for cooling of areas of the semifinished product
  • the device preferably has means which are suitable for controlling or regulating the volume flow and / or the flow velocity and / or the temperature of the flow. Furthermore, the device is preferably housed and has means for extracting the gaseous carbon dioxide or the mixture of carbon dioxide and air. This extraction can be realized by means already existing for chip extraction from areas in which the semifinished product is machined. However, separate means for suction are possible.
  • the apparatus advantageously comprises means for recycling and reusing the gaseous carbon dioxide or the mixture of carbon dioxide and air.
  • the method according to the invention and a device for narrow-surface coating of a plate-shaped semifinished product or workpiece are described in more detail below with reference to an embodiment and in which FIGS. 1 and 2 shown.
  • the show FIG. 3 a device in which individual areas of a narrow surface are selectively cooled
  • the FIG. 4 a milling machine as an example of a workstation in which the generated mixture of gaseous carbon dioxide and air is used to cool the workstation.
  • FIG. 1 shows in the lower part in a highly schematic representation of the workstations of a conventional edge banding machine for narrow-surface coating of a plate-shaped semi-finished, are made with the furniture panels in a three-layer manufacturing process according to the prior art.
  • the graph above shows the temperature profile (dash-dotted line) in the joining zone above the working area in this prior art edge banding machine.
  • the vertical axis of the diagram shows the temperature (T) in degrees Celsius
  • the horizontal axis represents the length L in meters (m) of the edge banding machine.
  • the diagram shows the softening temperature E (in degrees Celsius) and the heat resistance W of the hotmelt adhesive EVA / KS 350 used by means of two further, horizontally extending auxiliary lines.
  • softening temperature E is understood to mean the temperature at which a polymer deforms, eg. B. in the ring and ball method under the weight of the ball (DIN EN 1238). Since with many hotmelt adhesives no exactly defined softening temperature, but only a temperature range can be specified, the heat resistance W indicates the temperature at which the adhesive layer can withstand a temperature stress without deformation over long periods of time (Habenicht, G .: Glueing , Applications Springer-Verlag Berlin, Heidelberg, 2008).
  • the softening temperature E was about 125 ° C and the thermal stability W at 90 ° C.
  • the thermal resistance W is exceeded, the hot melt adhesive regularly comes out of the joint and, as a consequence, sticks to the tools and contaminates the surface of the board.
  • FIG. 2 shows in the lower part in a highly schematic representation of the work stations an edge banding machine for narrow-surface coating of a plate-shaped semifinished product, are made with the furniture panels in a three-layer manufacturing process by the novel process.
  • Fig. 1 For better comparability with the known edge banding machine Fig. 1 were used (as far as possible) the same reference numbers 1 ... 17 of the individual workstations.
  • the prior art edge banding machine ( Fig. 1 ) allows, depending on the size of the workpieces to be machined, the narrow surface coating of about 3000 workpieces per hour.
  • the machine achieves a feed rate v of the traversing plates P of up to 110m / min.
  • the edge banding machine formats and glues PVC, ABS, PP, melamine, paper, veneer edging or solid wood edge banding in thicknesses from 0.25 mm to 4 mm with 4 mm or larger edgebandings.
  • the plate-shaped semifinished product (P) to be processed is produced in a known edge banding machine according to the prior art ( Fig. 1 ) applied with a release agent application nozzle a fluid in the form of dispersed polymer, alcohol, surfactants on the surfaces of the plate-shaped semifinished product to be processed in order to prevent the subsequent adhesion of adhesive residues.
  • the formatting of the narrow surface is carried out to the desired shape.
  • the required geometry (straight course, groove, soft form, woodcut) of the narrow surface is produced with known cutting tools (milling cutter, grooving saw).
  • surface cooling K with liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air takes place depending on the adhesive used and the technological manufacturing parameters, in particular the feed rate of the edge banding machine and the cutting speed of the cutting tools before, during and after machining, to prevent the formation of built-up edges on the cutter and the melting of the polymer in the chipboard.
  • the workstation (3) is designed as a gluing station, in which the hot melt adhesive used is applied by means of rollers on the two narrow surfaces of the future furniture panel to be coated.
  • the temperature of the hot melt adhesive is 210 ° C when wetting the rollers.
  • plasma lasers, diode lasers or hot air nozzles are used to melt the adhesive.
  • glue rollers, surface application nozzles, infrared radiators or hot air showers are used to activate the adhesive.
  • the lateral supply of the edge material or the solid wood edging takes place.
  • the edge material is advanced synchronously with the plate at the speed of the conveyor belt of the edge banding machine.
  • the edge magazine can consist of several individual magazines. The beginning of the edge material is joined together at the front edge of the formatted plate.
  • the edgeband materials are adapted to the board thickness and have a two-sided overhang of approx. 2 mm.
  • the edge material is cut off at the end of the plate by a Kappmesser. This usually happens with a small protrusion at the trailing edge of the workpiece.
  • the workstation (6) comprises the pressure zone, which consists of the pressure roller and other pressure elements, which with a contact pressure of 2 - 4 bar the hot melt adhesive compact between edge material and plate.
  • the viscosity of the hotmelt adhesive used is still very low when the pressure zone is reached at a temperature of 180 ° C., so that in the case of devices according to the known prior art ( Fig. 1 ) comes to a leakage of the adhesive to the surfaces of the plate.
  • the cooling is done by known air showers, vortex tubes, air curtains or cooled pressure shoes.
  • the cooling takes place via a plurality of punctiform and flat-acting nozzles, through which the gaseous carbon dioxide or a mixture of carbon dioxide and air flows before, during and after the pressing on the joining zone and the adjacent plate areas and by the pressure elements used.
  • the cooling flow of the carbon dioxide is preferably used with a temperature of max. -78 ° C finely dosed used for cooling the adhesive joint. This makes it possible to optimally temper the adhesive zone depending on the hot melt adhesive used and its parameters.
  • the pressure zone can be shortened.
  • the length of the machine tool can advantageously be shortened in the case of the new production of generic edge banding machines with at least the same productivity. This results in lower procurement and maintenance costs for the machine tool and less space required in production.
  • the shortening of the pressure zone is in Fig. 2 symbolized by two broken lines.
  • the saved length of the pressure zone is shown as distance X.
  • the adhesive eye cooled down by means of vortex tubes, air showers, air curtains or cooling bars.
  • the average air consumption of these cooling methods according to the prior art is up to 10 m 3 / min, larger systems up to max. 50 m 3 / min.
  • Fig. 2 In the method according to the invention ( Fig. 2 ) can because of the significantly higher cooling capacity on the workstation (7) according to Fig. 1 completely dispensed with. As a result, the length of the machine tool can be shortened for the same productivity in the new production of generic edge banding machines. This results in lower manufacturing and maintenance costs for the machine tool and a smaller footprint in manufacturing.
  • the possible shortening of the length L of the edge banding machine is in Fig. 2 symbolized by two broken lines. The saved length of the machine tool is shown as distance X.
  • the edge material In the work station (8) are cut off by two chop saws the protruding surfaces of the edge material at the leading edge or trailing edge of the plate.
  • the Fig. 2 shown cooling with gaseous carbon dioxide or a mixture of carbon dioxide and air, depending on the used narrow-area materials and adhesives before, behind and / or at the workstation for cooling the cutting tools and the edge material.
  • the pre-milling of the edge material which protrudes at the top and bottom of the plate takes place.
  • unwanted reactivation of the hot-melt adhesive, heating of the edge and, as a consequence, contamination of the tools, the machine tool and the workpiece surfaces occur.
  • the cutting tool, the plate surface and the edge before and after milling locally or partially by the carbon dioxide or a mixture of carbon dioxide and air. Due to the equally preferred cooling of the tools used, for. B. by the flow of liquid or gaseous carbon dioxide through the hollow shaft of a cutting tool, the formation of built-up edges can be prevented and the tool life can be significantly increased.
  • the protruding edges of the edge material are milled flush with the plate surface by two cutters, so that it comes through the use of high-speed milling tools to a new unwanted reactivation of the hot melt adhesive.
  • the main and secondary cutting edges of the milling tools, the narrow surface band and the adjoining surface of the plate are cooled by gaseous carbon dioxide or a mixture of carbon dioxide and air before, during and after milling by means of a plurality of areal as well as punctiform nozzles. Fig. 2 ).
  • the thin edges of the edge material are (optionally) milled by two form cutters.
  • the cooling with gaseous carbon dioxide takes place locally via nozzles directed from outside onto the tool, the plate surface and the edge material ( Fig. 2 ).
  • the cooling of the cutting tools optionally additionally takes place directly through the coolant guided through the hollow tool shank.
  • the front and rear edges of the edge material are profiled with one or two corner rounding devices. Due to the small time window available, the high feed rates in the vertical direction cause high temperatures at the cutting edges of the milling tools. As a result, this process heat causes the leading and trailing edges of the edge material to melt and the edge material to be thermally stressed too high.
  • inventively see. Fig.
  • the cutting tools by means of several, locally acting nozzles the tools, the edge material and the adjacent plate surface before, during and after milling by a, adapted to the technological process parameters (cutting speed, feed rate, adhesive) volume flow cooled with gaseous carbon dioxide or a mixture of carbon dioxide and air ,
  • the cooling of the cutting tools is preferably carried out by the, guided through the hollow tool shank coolant.
  • one or two profiled scraper units are optionally used for processing the surface of the edge when processing plastic edges.
  • a thin chip (0.08 mm to 0.15 mm) is removed, which is to remove the previously formed milling burrs. This creates a uniform surface.
  • the frictional heat generated by the single-edged tools without the previous one Cooling with carbon dioxide at high feed or cutting speeds extremely high temperatures at the main cutting edge, which lead to a critical increase in temperature in the joining zone.
  • the tool, the plastic edge and the plate surface are cooled by a plurality of nozzles with carbon dioxide or a mixture of carbon dioxide and air ( Fig. 2 ).
  • customary application of release agents to prevent smearing by adhesive residues can be advantageously dispensed with.
  • the tool, the edge material and the plate surface are cooled with gaseous carbon dioxide or a mixture of carbon dioxide and air by a plurality of nozzles from the outside ( Fig. 2 ).
  • release agents cf. Fig. 1
  • the surfaces of the plate-shaped workpiece are polished and cleaned by sisal, cloth or Fibreusionn by paired Schwabbelaggregate.
  • the buffing wheels work in synchronism or counter-rotation to prevent the hot melt adhesive in the joining zone from being reactivated. As a result, the efficiency of the discs is significantly reduced.
  • the tool, the edge material and the plate surface are cooled by gaseous carbon dioxide or a mixture of carbon dioxide and air through a plurality of areal nozzles. Due to the fact that the actual temperature in the working zone has been significantly reduced compared with the prior art (see curves of the actual temperature in FIG Fig. 2 , top illustration) can be dispensed with in the inventive solution entirely or on a large part of the buffing wheels, since the outlet of hot melt adhesive in the upstream workstations is no longer to be feared. This results in lower manufacturing and maintenance costs and a reduced space requirement (symbolized by two broken lines and the distance Y, which corresponds to the saved length of the buffing station) of the present invention Edgebander. Again, the usual application of separating or cooling agents (see. Fig. 1 ) to prevent smearing caused by adhesive residues
  • the edges of the narrow surface are finally ground by two grinding units, so that again a significant heat input into the workpiece and a reactivation of the hot melt adhesive occurs.
  • several sanding belts with different grain sizes (coarse and fine sanding) must be used due to the process. Among other things, this leads to the strips sticking together with aluminum and solid wood particles. This causes extreme smearing of the aluminum in the belts.
  • rapeseed oil or other liquids of equivalent action are used as coolants, which lead to severe contamination of the plate surfaces.
  • the grinding tools, the edge material and the plate surface are cooled by a plurality of areal nozzles with gaseous carbon dioxide or a mixture of carbon dioxide and air ( Fig. 2 ).
  • gaseous carbon dioxide or a mixture of carbon dioxide and air Fig. 2
  • optional grooved units can be used. Due to the use of binders in the plates, the process of milling the grooves also causes process contamination of the tool cutting edges. The local cooling of the tool cutting edges, the plate and the edge with gaseous carbon dioxide or a mixture of carbon dioxide and air before and during milling, the process temperature can be significantly reduced in this work area (see curves of the actual temperature in Fig. 2 , upper illustration).
  • FIG. 3 shows a device in which individual areas of a narrow surface are selectively cooled. This is particularly advantageous in profiled or undercut narrow areas.
  • Fig. 3 is a plate (P), which moves in a direction (R) in the plane of drawing, shown in cross-section.
  • the plate (P) has a first cover surface (100) and a second cover surface (110) and a profiled narrow surface (120).
  • the narrow-surface material (20) by a plurality along the transport direction (R) of the plate (P) and along the width of the narrow surface (120) staggered to each other pressing elements or by an over the profile of Narrow surface (120) moving away pressure element over the profile of the narrow surface (120) across the first cover surface (100) to the second top surface (110) of the plate and pressed.
  • a second region (122) of the narrow surface (20) adjacent to the first region (121) is positioned closer to the second top surface (110) of the plate (P) , heated and the narrow-surface material (20) pressed in this area.
  • the first region (121) of the narrow surface (120) can be cooled by a targeted application of the flow of liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air through a first cooling unit (31) so that a detachment of the narrow-area material (20) from the narrow surface (120) due to restoring forces in the narrow-area material (20) in the first region (121) is prevented.
  • FIG. 3 schematically shown are six areas (121 to 126) of the narrow surface (120) and six each of a specific area (121 to 126) associated cooling units (31 to 36) along the transport direction (R) of the plate (P) at least partially offset from each other are arranged.
  • FIG. 4 shows a milling machine (40) as an example of a workstation in which the generated mixture of gaseous carbon dioxide and air is used to cool the workstation itself and to create defined environmental conditions for the workstation.
  • Shown schematically are a plate (P) and the milling machine (40), which processes the narrow surface (120) of the plate (P) with a milling tool (41).
  • the narrow surface (120) according to the invention is cooled by a flow of liquid and / or gaseous carbon dioxide or a mixture of carbon dioxide and air. This is in the area of the milling tool (41) before a carbon dioxide-air mixture with a low, specially set temperature.
  • the milling tool (41) is connected via a tool holder (42) with an engine block (43) and housed with a housing (45).
  • a fan (44) is arranged, which generates an air flow from the milling tool (41) facing side of the engine block (43) to the rear of the engine block (43) and thus cools the engine.
  • the air or the air mixture present there sucked which with the arrows in there Fig. 4 is shown. Since the housing (45) forms a closed space around the milling tool (41) and the tool holder (42), the carbon dioxide-air mixture drawn in by the fan wheel (44) between the milling tool (41) and the narrow surface (120) can the plate (P) is present, the engine block (43) are effectively cooled.
  • the carbon dioxide-air mixture is discharged or sucked by the fan wheel (44) to the environment, which is indicated by the arrows in Fig. 4 is shown. If the entire milling machine (40) or the environment of the workstation of a housing (50) is housed, which includes, for example. Also, the top surfaces of the plate (P) with, from the engine block (43) exiting air mixture for adjustment defined environmental conditions are used in the environment of the workstation.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Adhesives Or Adhesive Processes (AREA)
EP15186320.6A 2014-09-22 2015-09-22 Procede et dispositif de revetement de surface etroite de demi-produits en forme de plaque ou de pieces a usiner Active EP2998052B1 (fr)

Priority Applications (1)

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PL15186320T PL2998052T3 (pl) 2014-09-22 2015-09-22 Sposób i urządzenie do wąskopowierzchniowego powlekania płytowych półwyrobów lub przedmiotów obrabianych

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102014219064.9A DE102014219064A1 (de) 2014-09-22 2014-09-22 Verfahren und Vorrichtung zur Schmalflächenbeschichtung von plattenförmigen Halbzeugen oder Werkstücken

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Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102019113270A1 (de) * 2019-05-20 2020-11-26 Homag Gmbh Heißgaseinrichtung zum Bereitstellen von Heißgas sowie Beschichtungsvorrichtung und Verfahren zum Beschichten von Werkstücken

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568377A (en) 1968-01-09 1971-03-09 Robert Blohm Device for cooling and cleaning of grinding wheels
EP0483561A1 (fr) 1990-10-31 1992-05-06 Eaton Corporation Procédé et dispositif d'usinage
DE29819350U1 (de) * 1998-09-29 1999-01-07 Dorus Klebetechnik GmbH & Co. KG, 73441 Bopfingen Vorrichtung zum Herstellen eines beschichteten Plattenelementes
DE10042431C1 (de) 2000-08-30 2002-02-28 Angelika Riepe Verfahren zum Bearbeiten einer Platte aus Holz oder einem Holzwerkstoff sowie ein fluides Mittel zum Auftragen auf die Platte
EP1698738A2 (fr) * 2005-03-04 2006-09-06 REHAU AG + Co Panneau de construction léger et méthode de production
DE102007014832B3 (de) 2007-03-23 2008-09-11 Technische Universität Dresden Verfahren und Vorrichtung zur Schmalflächenbeschichtung eines plattenförmigen Sandwichmaterials und eine schmalflächenbeschichtete Sandwichplatte
EP2522476A2 (fr) 2011-05-12 2012-11-14 Bio-Circle Surface Technology GmbH Procédé de fabrication d'un élément de plaque revêtu en matière dérivée du bois avec une bande de rebord ainsi qu'une substance pour le procédé.

Patent Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3568377A (en) 1968-01-09 1971-03-09 Robert Blohm Device for cooling and cleaning of grinding wheels
EP0483561A1 (fr) 1990-10-31 1992-05-06 Eaton Corporation Procédé et dispositif d'usinage
DE29819350U1 (de) * 1998-09-29 1999-01-07 Dorus Klebetechnik GmbH & Co. KG, 73441 Bopfingen Vorrichtung zum Herstellen eines beschichteten Plattenelementes
DE10042431C1 (de) 2000-08-30 2002-02-28 Angelika Riepe Verfahren zum Bearbeiten einer Platte aus Holz oder einem Holzwerkstoff sowie ein fluides Mittel zum Auftragen auf die Platte
EP1698738A2 (fr) * 2005-03-04 2006-09-06 REHAU AG + Co Panneau de construction léger et méthode de production
DE102007014832B3 (de) 2007-03-23 2008-09-11 Technische Universität Dresden Verfahren und Vorrichtung zur Schmalflächenbeschichtung eines plattenförmigen Sandwichmaterials und eine schmalflächenbeschichtete Sandwichplatte
EP2522476A2 (fr) 2011-05-12 2012-11-14 Bio-Circle Surface Technology GmbH Procédé de fabrication d'un élément de plaque revêtu en matière dérivée du bois avec une bande de rebord ainsi qu'une substance pour le procédé.

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EP2998052B1 (fr) 2019-02-27
DE102014219064A1 (de) 2016-03-24
PL2998052T3 (pl) 2019-09-30

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