EP4069482A1 - Apparatus and method for coating a surface of a workpiece - Google Patents
Apparatus and method for coating a surface of a workpieceInfo
- Publication number
- EP4069482A1 EP4069482A1 EP20820132.7A EP20820132A EP4069482A1 EP 4069482 A1 EP4069482 A1 EP 4069482A1 EP 20820132 A EP20820132 A EP 20820132A EP 4069482 A1 EP4069482 A1 EP 4069482A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- pretreatment
- workpiece
- printing
- print head
- detection
- 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.)
- Granted
Links
- 238000000034 method Methods 0.000 title claims description 25
- 239000011248 coating agent Substances 0.000 title claims description 17
- 238000000576 coating method Methods 0.000 title claims description 17
- 239000000463 material Substances 0.000 claims abstract description 45
- 238000007639 printing Methods 0.000 claims abstract description 24
- 238000007641 inkjet printing Methods 0.000 claims abstract description 3
- 238000001514 detection method Methods 0.000 claims description 35
- 239000004831 Hot glue Substances 0.000 claims description 10
- 239000012815 thermoplastic material Substances 0.000 claims description 10
- 239000004922 lacquer Substances 0.000 claims description 9
- 230000004913 activation Effects 0.000 claims description 4
- 238000009499 grossing Methods 0.000 claims description 4
- 239000011155 wood-plastic composite Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 3
- 229920001587 Wood-plastic composite Polymers 0.000 claims description 3
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 3
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 3
- 238000003754 machining Methods 0.000 claims description 3
- 229920000915 polyvinyl chloride Polymers 0.000 claims description 3
- 239000004800 polyvinyl chloride Substances 0.000 claims description 3
- 239000007921 spray Substances 0.000 claims description 3
- 239000004925 Acrylic resin Substances 0.000 claims description 2
- 229920000178 Acrylic resin Polymers 0.000 claims description 2
- -1 polypropylene Polymers 0.000 claims description 2
- 229920001155 polypropylene Polymers 0.000 claims description 2
- 230000001105 regulatory effect Effects 0.000 claims description 2
- 238000002203 pretreatment Methods 0.000 abstract description 8
- 239000010410 layer Substances 0.000 description 19
- 238000012545 processing Methods 0.000 description 8
- 239000011148 porous material Substances 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 239000011241 protective layer Substances 0.000 description 4
- 239000002023 wood Substances 0.000 description 4
- 238000001816 cooling Methods 0.000 description 3
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 description 2
- 239000011093 chipboard Substances 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000002131 composite material Substances 0.000 description 1
- 239000012792 core layer Substances 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 239000000975 dye Substances 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000003801 milling Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 239000003973 paint Substances 0.000 description 1
- 238000000059 patterning Methods 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 239000004848 polyfunctional curative Substances 0.000 description 1
- 238000005070 sampling Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
Classifications
-
- 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
Definitions
- the invention relates to a device and a method for coating a surface of a workpiece, in particular a narrow side of a plate-shaped workpiece.
- Narrow sides of plate-shaped workpieces made of wood or wood-based materials are in many cases sealed with a so-called edge band.
- the edge band can be, for example, a veneer strip or a strip made of a plastic material.
- edgebands have a defined width. An edge band with a certain width is therefore used for a workpiece with a corresponding thickness. In order to increase the variability, edgebands with different widths and in different patterns are therefore used kept ready. However, this leads to an increased logistical effort.
- EP 1726 443 A1 which describes a device and a method for patterning the narrow side of plate-shaped workpieces.
- the device comprises a stationary printing unit with at least one inkjet print head, a conveying device and a detection device for detecting the dimensions and / or the position of the narrow side to be patterned.
- This device avoids having to readjust each time with changing component dimensions. Rather, for example, components with a wide variety of dimensions can be sampled in continuous operation without stopping the operation of the device.
- the above-mentioned device provides an improved sampling quality.
- the individual detection of each individual workpiece ensures that only the narrow sides, and not, for example, the top or bottom sides of the workpieces, are actually sampled in an undesired manner.
- the aim of the invention is to provide a device and a method for coating a surface of a workpiece, in particular a narrow side of a workpiece, with high quality, with a high degree of variability being achieved.
- the invention provides a corresponding device. Further embodiments are listed in the dependent claims.
- the invention also relates to a method according to claim 12. Features of the method and further embodiments thereof can be used in the context of the device. The same applies to features of the Device and their preferred developments that can be used in the context of the method.
- the device according to the invention is suitable for coating a surface of a workpiece.
- the surface is preferably a narrow side of a plate-shaped workpiece.
- the device comprises: at least one pretreatment device for pretreating a surface to be coated, a device for bringing about a relative movement between the pretreatment device and the workpiece, and at least one printing device, in particular an inkjet printing device, the printing device (30) comprising at least one digital print head.
- the print head can be designed as an inkjet print head. It is also provided that the pretreatment device is set up to apply a pretreatment material to the surface of the workpiece to be printed.
- the invention has particular advantages that the coating of a workpiece can be carried out with high variability and quality of the surface. Furthermore, the logistics associated with a coating of narrow sides are also simplified and thus the production costs are reduced. In addition, the user of the device / method is given the opportunity to influence the design and the quality of the coating on the workpiece.
- the pretreatment device is set up to apply a lacquer, a hot melt adhesive, a two-component material or a thermoplastic material.
- the pretreatment material for example paint, hot-melt adhesive, two-component material or thermoplastic material
- the pretreatment material is suitable for closing pores on the surface of the workpiece and / or compensating for unevenness, so that in a subsequent step for coating the surface of the workpiece, a high-quality result can be achieved.
- thermoplastic material can be applied to a workpiece in the heated state and subsequently hardens.
- the hardening process can be accelerated, for example, by a cooling device.
- a two-component material has proven to be particularly advantageous because this material is self-curing.
- the pretreatment device can comprise an activation device, in particular a UV activation device, in order to achieve rapid curing of a pretreatment material, in particular if it is a UV lacquer or UV hot melt adhesive.
- the pretreatment device comprises a nozzle, in particular a slot nozzle, and a stripping device for smoothing the material discharged by the nozzle.
- a nozzle in particular a slot nozzle
- a stripping device for smoothing the material discharged by the nozzle.
- the pretreatment device comprises an application nozzle / spray nozzle or a plurality of application nozzles. In this way, a contactless and at the same time uniform application of a pretreatment material can take place.
- pretreatment materials for example in the case of a two-component material a hardener in the edge area of the surface.
- dyes can be added in a targeted manner.
- the device also has a detection device for detecting a property of the surface to be coated having.
- a control device of the device can be set up to control and / or regulate the pretreatment device and / or the printing device on the basis of the detection result of the detection device.
- intelligent monitoring can be provided which, in the case of regulation, provides a self-adjusting system.
- the detection device has a first detection module which is arranged and set up to detect the surface to be coated before the pretreatment.
- the first detection module is arranged upstream of the pretreatment module in the throughfeed direction.
- the first detection module can be used to determine differences in the bulk density and / or the porosity of the surface to be coated. This information can be used to specifically influence the pretreatment.
- the detection device comprises a second detection module which is arranged and set up to detect the surface to be coated after the pretreatment.
- the second detection module is arranged after the pretreatment module in the throughput direction.
- the printing device has at least one print head, preferably several print heads.
- the nozzles of the print head have a diameter in the range from 2 pm to 200-300 pm, preferably in the range from 2 pm to 100 pm, particularly preferably in the range from 2 pm to 12 pm.
- a cover layer can be applied to the workpiece with each print head in such a way that, starting from the With the surface pretreated with the pretreatment device, a multi-layer structure is created.
- an outermost layer can be designed as a protective layer, which is made of a particularly resistant material. If this outermost layer is transparent, a decorative layer can be formed underneath this protective layer. Furthermore, layers can be provided which give the entire coating a certain thickness which is coordinated with the configuration of the cover layer present on the broad side. According to a further embodiment, an electrically conductive material can be provided in one of the layers.
- the print heads of the printing device each have a separate material store.
- the printheads can be supplied with different materials.
- the print heads of the printing device can have a variable print height.
- workpieces of different thicknesses can be printed on a narrow surface.
- the invention also relates to a method for coating a surface of a workpiece, such as in particular a narrow side of a plate-shaped workpiece.
- a device according to one of the preceding claims can be used.
- the method comprises the steps of: pretreating a surface to be coated with a pretreatment device, bringing about a relative movement between the pretreatment device and the workpiece, and printing the pretreated surface by means of one or more print heads.
- a material applied by the pretreatment device is a UV lacquer, a UV hot melt adhesive, a two-component material or a thermoplastic material.
- a UV lacquer or a UV hotmelt adhesive can in particular be cured by means of a UV source.
- thermoplastic material can be applied to a workpiece in the heated state and subsequently hardens.
- the hardening process can be accelerated, for example, by a cooling device.
- a two-component material has proven to be particularly advantageous in that a two-component material is self-curing.
- a material applied by at least one of the print heads PVC (polyvinyl chloride), PP (polypropylene), ABS (acrylonitrile-butadiene-styrene copolymer), wood-plastic composite material (WPC; Wood- Plastic composites) or acrylic resin.
- PVC polyvinyl chloride
- PP polypropylene
- ABS acrylonitrile-butadiene-styrene copolymer
- WPC Wood- Plastic composites
- acrylic resin acrylic resin
- the surface has a profile, for example one or more radii and / or chamfers. It can be provided that the profile is introduced into the workpiece by means of a machining device, for example a milling cutter, and that the pretreatment step then takes place.
- a machining device for example a milling cutter
- a property of the surface to be coated is recorded before or after pretreatment.
- the pretreatment device and / or the print head (s) can be controlled and / or regulated on the basis of the detection result (in particular by means of a control device).
- Fig. 1 is a schematic view of an apparatus according to an embodiment of the invention.
- plate-shaped workpieces can be provided with a coating on their narrow side.
- the plate-shaped workpieces mentioned are workpieces made of wood, wood-based materials or composites, in particular chipboard, MDF panels or the like.
- a coating should be applied to the narrow side of such workpieces in order to anneal the narrow side.
- the main side also known as the broad side, either has a top layer or does not require any further coating.
- a workpiece W is moved in a horizontal direction by means of the device.
- the direction of movement is indicated in the attached figure with an arrow.
- the device comprises a conveying device, such as a Conveyor belts, a conveyor belt or a conveyor chain.
- a workpiece can also be moved by means of a robot.
- the device also has a pretreatment device 20 which is set up to apply a pretreatment material to the narrow side of the workpiece W to be coated.
- the pretreatment device 20 comprises a nozzle (in particular a slot nozzle) and a stripping device for smoothing the material discharged by the nozzle.
- the pretreatment device can comprise a spray nozzle.
- the pretreatment material is used to level out pores and unevenness on a narrow side of the workpiece W and to provide a flat and uniform surface.
- a UV lacquer, a UV hotmelt adhesive, a two-component material or a thermoplastic material have proven to be particularly advantageous as the pretreatment material, with a UV lacquer and a UV hotmelt adhesive in particular being able to be cured by means of a UV source.
- a thermoplastic material can be applied to a workpiece in the heated state and subsequently hardens. The hardening process can be accelerated, for example, by a cooling device.
- a two-component material can be mixed from two components before it is applied to the workpiece, so that a self-curing process is started.
- the pretreatment device 20 is accordingly set up to apply at least one of the materials mentioned to the narrow side of the workpiece W and thus to prepare the narrow side for a subsequent processing step.
- the narrow side of the workpiece W provided with the cured pretreatment material provides a surface that is tempered, in particular, in the course of further processing can be printed.
- a surface has a similar hard structure as other sides of the workpiece.
- the device further comprises a printing device 30 which has a plurality of print heads 30a, 30b.
- a printing device 30 which has a plurality of print heads 30a, 30b.
- two print heads are provided, it also being possible to use a larger number (number n) of print heads.
- the print heads 30a, 30b each apply a cover layer to the workpiece W in such a way that, starting from the surface pretreated with the pretreatment device 20, a multilayer structure is created.
- the print heads are designed as inkjet print heads, the nozzles of which have a diameter in the range from approx. 2 pm to 12 pm.
- an outermost layer can be designed as a protective layer, which is made of a particularly resistant material. If this outermost layer is transparent, a decorative layer can be formed underneath this protective layer. Furthermore, layers can be provided which give the entire coating a certain thickness which is coordinated with the configuration of the cover layer present on the broad side. An electrically conductive material can be provided in one of the layers.
- the print heads 30a, 30b of the printing device 30 are also adapted to such a profile in order to ensure an equal distance between the nozzles of the print heads and the surface to be coated.
- the device further comprises a detection device 10 which has a first detection module 10a and a second detection module 10b.
- the first acquisition module 10a is arranged in front of the pretreatment device 20, whereas the second acquisition module 10b is arranged in a subordinate manner to the pretreatment device 20.
- the detection modules 10a, 10b are set up to carry out a contactless detection of an area.
- a surface of the workpiece W that has not yet been treated is detected with the first detection module 10a and the pretreatment device 20 is set or adjusted based on the detection result. For example, the amount of pretreatment material to be dosed can be set or changed. This ensures that possible pores or unevenness on the narrow side of the workpiece W are evened out and / or filled.
- the work result of the pretreatment device 20 can be checked with the second detection module 10b in order to ensure a high-quality surface before printing with the printing device 30.
- the device can also have a processing device for processing the surface of a workpiece W.
- a processing device for processing the surface of a workpiece W.
- a profile can be introduced into the surface of a workpiece W, if necessary, before a pre-treatment material is applied to the narrow side of the workpiece W to be coated by means of the pre-treatment device 20.
- the processing device can be omitted, in particular if the device is to be used to coat workpieces which have a flat narrow side or have already been provided with a profile. Processing of a plate-shaped workpiece is carried out as explained below.
- the workpiece W is placed on a conveyor of the apparatus and moved in the direction of movement.
- the workpiece W is aligned and conveyed into the area of the first detection module 10a of the detection device 10.
- the first detection module 10a determines whether the assessed narrow side of the workpiece has unevenness and / or pores. A quantitative recording of the unevenness and / or pores is also carried out.
- the result ascertained by the first acquisition module 10a is transmitted to the control device of the device, the control device being set up to make settings on the pretreatment device 20, which is arranged lower in the flow direction, based on the acquisition result.
- the surface of the workpiece W is then pre-treated with the pre-treatment device 20 in that a pre-treatment material is applied to the surface of the workpiece.
- This pretreatment material is preferably a UV lacquer, UV hot melt adhesive, or a thermoplastic material which is applied by means of a nozzle and distributed and smoothed on the surface of the workpiece W by means of a smoothing device.
- a second detection module 10b which detects the surface pretreated with the pretreatment device 20.
- the detection result is transmitted to the control device of the device.
- the control device is set up to carry out a regulation of the pretreatment device 20 based on the detection result of the second detection module 10b, for example by the pretreatment device 20 to reduce or increase the amount applied.
- the workpiece W then arrives in the region of the printing device 30, which has a plurality of print heads.
- a plurality of print heads 30a, 30b By using a plurality of print heads 30a, 30b, a multilayer structure is generated on the narrow side of the workpiece W in order to remunerate the narrow side of the workpiece W.
Landscapes
- 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)
- Coating Apparatus (AREA)
Abstract
Description
Claims
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
DE102019133335.0A DE102019133335A1 (en) | 2019-12-06 | 2019-12-06 | Apparatus and a method for coating a surface of a workpiece |
PCT/EP2020/084704 WO2021110952A1 (en) | 2019-12-06 | 2020-12-04 | Apparatus and method for coating a surface of a workpiece |
Publications (2)
Publication Number | Publication Date |
---|---|
EP4069482A1 true EP4069482A1 (en) | 2022-10-12 |
EP4069482B1 EP4069482B1 (en) | 2024-06-26 |
Family
ID=73726836
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20820132.7A Active EP4069482B1 (en) | 2019-12-06 | 2020-12-04 | Device and method to cover the surface of a workpiece |
Country Status (5)
Country | Link |
---|---|
US (1) | US20230015828A1 (en) |
EP (1) | EP4069482B1 (en) |
CN (1) | CN114761189B (en) |
DE (1) | DE102019133335A1 (en) |
WO (1) | WO2021110952A1 (en) |
Families Citing this family (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP4341058A1 (en) * | 2021-07-02 | 2024-03-27 | Jowat SE | Edge coating of substrates, especially plate-shaped substrates |
Family Cites Families (12)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE10031030B4 (en) * | 2000-06-26 | 2005-08-04 | Bauer, Jörg R. | Method and device for producing flat components with a predetermined surface appearance and planar component, in particular front panel of a kitchen element |
DE10224128A1 (en) * | 2002-05-29 | 2003-12-18 | Schmid Rhyner Ag Adliswil | Method of applying coatings to surfaces |
DE202004000662U1 (en) * | 2004-01-17 | 2004-04-08 | Homag Holzbearbeitungssysteme Ag | Machine for printing the narrow sides of plate-shaped workpieces |
PL1726443T3 (en) * | 2005-04-28 | 2007-10-31 | Homag Holzbearbeitungssysteme Ag | Method and apparatus for marking the sides of a plane workpiece |
EP1839883B1 (en) * | 2006-03-08 | 2016-08-24 | Homag Holzbearbeitungssysteme AG | Method and device for printing on plate-like objects |
DE502006005293D1 (en) * | 2006-08-25 | 2009-12-17 | Homag Holzbearbeitungssysteme | Device for patterning workpieces |
EP1935657B1 (en) * | 2006-12-20 | 2013-02-13 | Homag Holzbearbeitungssysteme AG | Method and device for coating workpieces |
ES2384578T3 (en) * | 2007-11-30 | 2012-07-09 | Homag Holzbearbeitungssysteme Ag | Device and method of machining materials in the form of a band for the decoration of a work piece |
KR101456293B1 (en) * | 2012-01-13 | 2014-11-03 | 전광심 | Experiment with applying printing to the edge of the wood surface treatment methods |
DE102015212409A1 (en) * | 2015-07-02 | 2017-01-05 | Homag Holzbearbeitungssysteme Gmbh | Method for coating and marking workpieces |
DE102015219108A1 (en) * | 2015-10-02 | 2017-04-06 | Homag Gmbh | Method and device for narrow-surface coating |
DE202019104261U1 (en) * | 2019-08-02 | 2020-11-03 | Surteco Gmbh | Edging |
-
2019
- 2019-12-06 DE DE102019133335.0A patent/DE102019133335A1/en active Pending
-
2020
- 2020-12-04 US US17/782,974 patent/US20230015828A1/en active Pending
- 2020-12-04 CN CN202080083600.2A patent/CN114761189B/en active Active
- 2020-12-04 EP EP20820132.7A patent/EP4069482B1/en active Active
- 2020-12-04 WO PCT/EP2020/084704 patent/WO2021110952A1/en unknown
Also Published As
Publication number | Publication date |
---|---|
CN114761189B (en) | 2023-09-19 |
CN114761189A (en) | 2022-07-15 |
EP4069482B1 (en) | 2024-06-26 |
US20230015828A1 (en) | 2023-01-19 |
DE102019133335A1 (en) | 2021-06-10 |
WO2021110952A1 (en) | 2021-06-10 |
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