EP4335554A1 - Verfahren zur beschichtung einer platte - Google Patents

Verfahren zur beschichtung einer platte Download PDF

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Publication number
EP4335554A1
EP4335554A1 EP22195098.3A EP22195098A EP4335554A1 EP 4335554 A1 EP4335554 A1 EP 4335554A1 EP 22195098 A EP22195098 A EP 22195098A EP 4335554 A1 EP4335554 A1 EP 4335554A1
Authority
EP
European Patent Office
Prior art keywords
board
melt glue
coating
glue
hot
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.)
Withdrawn
Application number
EP22195098.3A
Other languages
English (en)
French (fr)
Inventor
Asko VIILI
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.)
Koskisen Oy
Original Assignee
Koskisen Oy
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 Koskisen Oy filed Critical Koskisen Oy
Priority to EP22195098.3A priority Critical patent/EP4335554A1/de
Publication of EP4335554A1 publication Critical patent/EP4335554A1/de
Withdrawn legal-status Critical Current

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Classifications

    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D7/00—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials
    • B05D7/06—Processes, other than flocking, specially adapted for applying liquids or other fluent materials to particular surfaces or for applying particular liquids or other fluent materials to wood
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D1/00—Processes for applying liquids or other fluent materials
    • B05D1/28—Processes for applying liquids or other fluent materials performed by transfer from the surfaces of elements carrying the liquid or other fluent material, e.g. brushes, pads, rollers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B05—SPRAYING OR ATOMISING IN GENERAL; APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D—PROCESSES FOR APPLYING FLUENT MATERIALS TO SURFACES, IN GENERAL
    • B05D5/00—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures
    • B05D5/02—Processes for applying liquids or other fluent materials to surfaces to obtain special surface effects, finishes or structures to obtain a matt or rough surface

Definitions

  • the invention relates to coating boards comprising wood materials. More particularly, the invention relates to coating boards made of using wood as base material, typically veneer boards, chipboards and blockboards. Specifically the invention relates to forming an anti-slip and wear resistance coating on such boards.
  • the surface of the board may be used to give a desired visual appearance or a functional surface. Coating of the surface of the board is used to give the board desired properties, the most common surface coating being simple painting or varnishing of the surface. However, if high wear resistance, specific frictional properties, hardness, resistance to chemicals or moisture or other properties not inherent for wood boards are needed, specific coating materials and methods have to be used.
  • the coating usually also improves the visual appearance of the board surface. There are several methods for applying a coating. Spray application may be the simplest one. However, film coatings usually provide wider variety of uses and applications.
  • One traditional film coating type is an impregnated paper that is fixed on the surface of the board by applying heat and pressure. A wide range of polymer and composite sheets or even metal sheets or films may be applied on the surface. These are often adhered to the surface by gluing.
  • Coating of a wooden board is a widely used practice. Therefore there are many combinations of coating materials, production methods and base boards. Some of these are described in following publications: US 2018/0320388 discloses a multilayer covering panel, US 2018/0111360 discloses a PVC composite flooring panel, US 2017/0121982 discloses a laminated fire resistant panel, US 2014/1238593 describes a shaped body covered with a film-shaped substrate, JP2002210710 discloses a wood material coated with a hydrophilic adhesive agent and CN 202969824U discloses a bamboo veneer coated with a PUR hot melt adhesive.
  • a method for producing a board comprising wood material and a coating of hot melt glue wherein the hot melt glue is spread on the surface the of the board by a rotating roller so that the film layer applied on the surface of the board is split between the rotating roller and the surface of the board to form protrusion on the coating.
  • a board comprising wood material and a coating of hot melt glue having random protrusions on the surface.
  • the hot melt glue is spread using a roller having a rubber surface.
  • the hot melt glue is PUR hot melt glue.
  • the splitting action of the film layer is controlled by altering one of the variables of: a gap between the applicator roll and the surface of the board, the relative speed between the applicator roll and the board, the viscosity of the applied hot melt glue.
  • the splitting action of the film layer is controlled by adjusting the gap between the applicator roll and the heating roll and/or the speed difference between surfaces of said rolls.
  • wood comprises material from stems of trees and wood-stemmed plants. Usually wood is referred to be made of cellulosic fibers embedded in lignin.
  • the board of wood material in this context refers to solid boards for constructional purposes such as plywood boards, chipboards and blockboards.
  • the method uses a substance usually intended for gluing pieces for preparing a coating.
  • a substance usually intended for gluing pieces for preparing a coating is PUR-hot melt glue.
  • the surface of a wood board is coated in order to protect it against water, chemicals and wear.
  • the coating may also enhance the visual properties of the wood board.
  • the board is coated with a hot melt type glue so that a required amount of glue is melted on the board.
  • This coating forms a protecting layer against moisture, chemicals and wear.
  • the method enables production of coated wood board for floor structures where good friction and grip is required, for example in vehicles.
  • the method provides a special surface structure having high friction and thus a good grip on the surface.
  • FIGURE 1 illustrates schematically a method in accordance with at least some embodiments of the present invention.
  • the board 3 to be coated is passed through a nip formed between a counter roll 1 or similar support system and an applicator roll 2.
  • a heating roll 4 is arranged to form a measuring nip with the applicator roll 2.
  • a feed pipe 5 or pipes (see FIGURE 2 ) is arranged to feed glue to a slot formed by the applicator roll 2 and the heating roll 4 on top of the nip formed by said rolls.
  • the heating roll 4 is used to keep the glue fluid.
  • the pumping and feed pipes 5 are heated for same purpose.
  • the board 3 to be coated is supported on the incoming side and exit side of the nip of a counter roll 1 and the applicator roll 2. Rolls, roll bars, bearing rolls, a transporter or any support structure the manufacturer of the apparatus desires to use, may accomplish the support. This kind of glue application apparatuses are readily available commercially.
  • the board In order to form a coating on the board, the board is fed into the nip between the counter roll 1 or similar support system and the applicator roll 2.
  • the support structures on opposite side of the applicator roll 2 carry the board 3.
  • a gap is formed between the applicator roll 2 and the surface of the board 3 ( FIGURE 2 ).
  • the width of this gap is one of the variables used to adjust the coat weight of the applied glue on the surface of the board and the formation of the top surface of the coating.
  • the amount of the glue applied on the applicator roll 2 is adjusted by setting the gap (the nip) between the applicator roll 2 and the heating roll 4.
  • the relative rotation directions of the applicator roll and the heating roll 4 affect the spreading of the glue on the applicator roll 2 and thus may have a role on the type of surface achieved on the final coating on the board.
  • the viscosity of the glue relates the spreading action and application closely. The viscosity can be effected by adjusting the temperature of the applied glue by using the heating capability of the heating roll 4 and heating elements related to the feeding pipe 5.
  • the apparatuses described above are used for application of glue for fixing layers of material together.
  • the glue has to be spread evenly or as a desired pattern between the layers.
  • the aim is to obtain a coating surface of a desired type.
  • the purpose is to provide protrusions on the surface of the coating.
  • the spreading action has to be adjusted so that the applied glue film splits between the applicator roll 2 and the surface of the board as seen in FIGURE 2 . The splitting leaves peaks on the surface of the coating that is spread on the board.
  • the desired type of coating can be obtained by setting the process to run using one initial setting and thereafter adjusting one or more variables until splitting of the applied film and final surface having protrusions on the coating is obtained.
  • the random splitting action of the glue film provides random protrusions on the top surface of the coating.
  • a hot-melt glue sets rather rapidly. This maintains the rough structure of the surface of the coating as the glue doesn't have sufficient time to flow to a smooth even layer.
  • the setting up of the process can be started, for example, by choosing the glue that is applied and production speed for the coated board.
  • the choice of glue gives a recommended temperature range and viscosity and the operation instructions of the apparatus used sets limits for production speed.
  • the gap between the applicator roll 2 and the board can be changed or the relative speed between the board and the surface of the applicator roll 2 can be changed until splitting occurs. This can be done by changing speed of the board 3, rotation speed of the applicator roll or even the rotation direction of the applicator roll 3.
  • One setting providing the splitting includes rotating the applicator roll 2 (arrow 1) in the same direction as the board travels (arrow 7). In this way the surfaces of the roll 2 and the board 3 form an opening gap where the surfaces move away from each other and stretch the coating layer therebetween.
  • One part 8 of the coating attached to the surface of the board and remaining part 9 follows the surface of the applicator roll 2 back to the glue puddle 6.
  • the stretching action and uneven surface 10 is illustrated in FIGURE 2 .
  • Another factor that can be altered is the temperature of the applied glue.
  • the final adjustment of the temperature is made by changing the heating power of the heating roll 4.
  • One suitable material for the surface of the applicator roll is rubber.
  • the surface of the roll is preferably smooth.
  • the heating roll 4 is preferably a chromed steel roll.
  • the gap between the applicator roll 2 and the heating roll 4 may be adjusted and/or the speed difference between said rolls.
  • the process can be repeated for following batches directly. This enables producing even small batches rapidly as settings can be rapidly changes once they have been established by using the above guidelines.
  • Suitable materials for coating are hot-melt glues.
  • the glue is chosen according to the requirements of the intended purpose of the coated board.
  • the glue may be polyamide (PA), ethylene-vinyl asetate (EVA), polyurethane (PUR), polyethylene (PE), polycarbonate (PC).
  • Particularly suitable glues are reactive hot-melt glues, for example PUR-hot-melt glues.
  • PUR-hot-melt glues is TECHNOMELT PUR 9622-02 UV from HENKEL AG & KGaA. This TECHNOMELT glue is applied in melted state and it sets when exposed to moisture. The required moisture can be provided from ambient moisture, moisture of the substance to be coated or by adding water as mist, vapour or spray.
  • FIGURE 3 shows a glue feeding system for the apparatus of FIGURE 1 .
  • the apparatus includes a hotmelt drum 12 for hotmelt glue.
  • a pump and heating system 11 is mounted on the hotmelt drum 12 and connected to feed pipes 5 that lead to spreading roller system 2, 4, the applicator roll 2 and the heating roll 4 of FIGURES 1 and 2 .
  • the purpose of the glue feeding system is to fluidize the hot-melt glue, maintain a desired temperature and feed a desired measured amount of glue to the spreading roller system 2, 4.
  • FIGURE 4 illustrates an example of a coated veneer board.
  • the board is coated with a PUR-hot-melt glue by using above described method.
  • the uneven surface 10 comprising the protrusions according to the invention can be seen on the surface.
  • FIGURE 4 shows the board in cross section.
  • the coating can be seen as the top layer 13 of the cross section.
  • the protrusions can be observed on the top of the layer.
  • FIGURE 4 shows a gap between the board 3 and the top layer 13. This gap is for illustrative purposes only, actually the top layer 13 is attached to the board 3.
  • a precoat layer is applied on the board before application of the top layer.
  • Such precoat increases cost of manufacture and may effect adversely on formation of the slitting phenomenon. Therefore, the precoat must be carefully chosen and used only if needed for obtaining specific functional properties for the product.
  • This method is not limited to boards having certain length as the coating process is continuous.
  • the width of the board is limited only by the largest width of the production apparatus that is used.
  • the method can be easily reproduced. Some beneficial properties of the products made by the method are, for example: good grip and high friction, good wear resistance, good durability under moisture, pleasant appearance.
  • the method is easy to implement and enables producing various sizes of wooden boards even in small batches. One can contemplate that both sides of the board are coated.
  • the board to be coated should have a sufficient thickness so that it maintains its rigidity during coating without continuous support.
  • the support provided is usually a set of rolls and the counter roll 1.
  • the random splitting action requires sufficient amount of material to be spread on the surface of the board.
  • the amount of coating on the board should be 100 g/m 2 or higher, for example within a range of 100 g/m 2 - 800 g/m 2 , preferably 200 g/m 2 - 600 g/m 2 and most preferably 400 g/m 2 - 600 g/m 2 .
  • the surface of the board should be evenly covered with a uniform layer without any gaps or holes. However, one can contemplate that a patterned applicator roll is used to obtain patterned coating providing partial exposure to the surface of the board. Such products may have use in special limited applications.
  • the invention can be used for manufacture of coated wooden boards.

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Wood Science & Technology (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
EP22195098.3A 2022-09-12 2022-09-12 Verfahren zur beschichtung einer platte Withdrawn EP4335554A1 (de)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP22195098.3A EP4335554A1 (de) 2022-09-12 2022-09-12 Verfahren zur beschichtung einer platte

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP22195098.3A EP4335554A1 (de) 2022-09-12 2022-09-12 Verfahren zur beschichtung einer platte

Publications (1)

Publication Number Publication Date
EP4335554A1 true EP4335554A1 (de) 2024-03-13

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Family Applications (1)

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EP22195098.3A Withdrawn EP4335554A1 (de) 2022-09-12 2022-09-12 Verfahren zur beschichtung einer platte

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002210710A (ja) 2001-01-12 2002-07-30 Mamoru Tatsuta 加工木材
WO2006087085A2 (de) * 2005-02-17 2006-08-24 Karl W. Niemann Gmbh + Co. Kg Verfahren zum beschichten von werkstücken mit rutschfestem belag
CN202969824U (zh) 2012-12-25 2013-06-05 安吉恒丰竹木产品有限公司 一种柔性重组竹装饰材料
US20170121982A1 (en) 2015-10-28 2017-05-04 Armstrong World Industries, Inc. Fire performance for wood veneer laminated ceiling tile
US20180111360A1 (en) 2016-10-21 2018-04-26 Wenhui Xiao Pvc composite flooring
US20180320388A1 (en) 2015-09-17 2018-11-08 Beaulieu International Group Nv Custom-Made Covering Panels by Digital Printing of Base Panels

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002210710A (ja) 2001-01-12 2002-07-30 Mamoru Tatsuta 加工木材
WO2006087085A2 (de) * 2005-02-17 2006-08-24 Karl W. Niemann Gmbh + Co. Kg Verfahren zum beschichten von werkstücken mit rutschfestem belag
CN202969824U (zh) 2012-12-25 2013-06-05 安吉恒丰竹木产品有限公司 一种柔性重组竹装饰材料
US20180320388A1 (en) 2015-09-17 2018-11-08 Beaulieu International Group Nv Custom-Made Covering Panels by Digital Printing of Base Panels
US20170121982A1 (en) 2015-10-28 2017-05-04 Armstrong World Industries, Inc. Fire performance for wood veneer laminated ceiling tile
US20180111360A1 (en) 2016-10-21 2018-04-26 Wenhui Xiao Pvc composite flooring

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