EP2506986A2 - Procédé pour enduire un article - Google Patents

Procédé pour enduire un article

Info

Publication number
EP2506986A2
EP2506986A2 EP10809167A EP10809167A EP2506986A2 EP 2506986 A2 EP2506986 A2 EP 2506986A2 EP 10809167 A EP10809167 A EP 10809167A EP 10809167 A EP10809167 A EP 10809167A EP 2506986 A2 EP2506986 A2 EP 2506986A2
Authority
EP
European Patent Office
Prior art keywords
particles
article
layer
partially
process according
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Withdrawn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
EP10809167A
Other languages
German (de)
English (en)
Inventor
Max Canti
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.)
Biesse SpA
Original Assignee
Biesse SpA
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 Biesse SpA filed Critical Biesse SpA
Publication of EP2506986A2 publication Critical patent/EP2506986A2/fr
Withdrawn legal-status Critical Current

Links

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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/12—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by mechanical means
    • 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
    • B05D3/00—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials
    • B05D3/02—Pretreatment of surfaces to which liquids or other fluent materials are to be applied; After-treatment of applied coatings, e.g. intermediate treating of an applied coating preparatory to subsequent applications of liquids or other fluent materials by baking
    • B05D3/0254—After-treatment
    • 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
    • B05D1/40—Distributing applied liquids or other fluent materials by members moving relatively to surface
    • B05D1/42—Distributing applied liquids or other fluent materials by members moving relatively to surface by non-rotary members
    • 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
    • B05D2401/00—Form of the coating product, e.g. solution, water dispersion, powders or the like
    • B05D2401/30—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant
    • B05D2401/32—Form of the coating product, e.g. solution, water dispersion, powders or the like the coating being applied in other forms than involving eliminable solvent, diluent or dispersant applied as powders
    • 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

Definitions

  • the present invention relates to a process and to a machine for coating an article and to an at least partially coated article.
  • the present invention also relates to a method and to a device for producing particles .
  • the decoration of a ceramic biscuit takes place by the deposition of colouring oxides and of a layer of protection glaze after having cooled the ceramic biscuit coming out from the firing oven at temperatures below 100°C. Subsequently, the biscuit with the oxides and the glaze is fired again (usually at a temperature between 1200 °C and 1300°C) in an operation designated "third firing" .
  • Coating powders for wood are not applied by gravity but instead by electrostatic effect such as for metal with the difference that wood must first be made conductive by spraying a solution of conductive salts which must then be dried. This causes, due to the water in the solution, a swelling of the wooden fibres that deforms the surface of the panel.
  • the employed salt which is hygroscopic, retains the water that evaporates during a subsequent step of firing of the coating in a hot environment at 130-180°C causing the formation of vesicles on the surface. Therefore, the resulting finishing is an aesthetically unpleasant finishing which is generally poorly appreciated (for example in the industry of furniture) .
  • Conductive graphitized coatings have also been used on the raw panel to overcome the drawback of hygroscopic salt, but after some time (about one year) partial detachment of the paint occurred.
  • FIG. 1 diagrammatically shows a machine, made according to the present invention, for coating an article
  • FIG. 2 diagrammatically shows a part of the machine of figure 1 which is not shown in the latter figure;
  • figure 3 is an alternative embodiment of details of figure 1;
  • figure 4 is a drawing on an enlarged scale of details of the machine of figure 1;
  • figure 5 is a section of a detail in figures 2 and 3 ;
  • figure 6 is a perspective view of an alternative embodiment of details of figure 1;
  • FIG. 7 shows another embodiment of the machine of figure 1;
  • FIGS. 8 and 9 are respectively perspective views of an article before and after the deposition of a coating layer.
  • numeral 1 indicates as a whole a machine for at least partially coating an article 2 (in particular a panel - see figures 8 and 9) comprising a conveying system 3 to feed article 2 along a determined path P; a deposition device 4 (which is arranged along path P) to spread particles 5 (in particular, having size from 20 ⁇ to 2 mm) comprising at least one organic binder on a surface 6 (figure 8) of article 2; a heating device 7 (which is arranged along path P, in particular downstream of deposition device 4) to heat particles 5 so as to obtain a layer L, which is at least partially liquid; a surface treatment device 8, which is arranged (along path P) downstream of heating device 7 and comprises a compression assembly 9 having a contact surface 10, which is adapted to come into contact with layer L and exert a pressure on layer L.
  • Heating device 7 is adapted to heat particles 5 to a temperature above 100°C, in particular so that particles 5 are at least partially bound to one another.
  • device 7 comprises an infrared radiation source (which is arranged above a segment of path P) to emit infrared radiation towards particles 5 deposited on surface 6.
  • Compression assembly 9 is provided with a membrane 11, which membrane 11 has said contact surface 10.
  • Assembly 9 also comprises a handling system 12 to feed membrane 11 synchronously to article 2 along a segment of path P. More specifically, in use, membrane 11 (more precisely a segment of membrane 11) and article 2 are fed in contact and at the same speed along the mentioned segment.
  • handling system 12 comprises three pulleys, of which one is typically driven by a motor and the others idle .
  • membrane 11 is a membrane comprising (in particular made of) a silicon rubber. More specifically the membrane comprises (in particular is made of) the RTV2 16 Shore A silicon rubber. The silicon rubber promotes the detachment from layer L.
  • Surface treatment device 8 comprises a cooling unit (of the type known per se and not shown) , which has a fluidic circuit, along which a cooling liquid flows.
  • the fluidic circuit is in contact with membrane 11.
  • compression assembly 9 comprises a roller, which has said contact surface 10, and a handling system to rotate the roller on article 2 while article 2 is fed along path P at surface treatment device 8.
  • the cooling circuit is arranged (at least partially) within the roller so as to cool contact surface 10.
  • the roller has a substantially cylindrical shape (having a uniform circular cross section) .
  • Contact surface 10 is defined by an outer chromium layer (of the chromed roller) having a continuous thickness of at least 1 mm.
  • the chromium plating i.e. the layer of chromium
  • the compression assembly 9 comprises a membrane mould.
  • Membrane moulds are moulds known per se and operate by creating a depression between article 2 to be treated and a membrane (of the mould) , which thereby presses article 2 thus adapting to (and deforming according to) the shape of article 2. Thereby, conveying system 3 feeds article 2 discontinuously (stepwise) so as to allow the membrane mould to close on article 2.
  • the use of membrane moulds is especially useful when surface 6 is not completely flat; in particular, when surface 6 has depressions and/or reliefs (for example, when article 2 is a panel provided with one or more relief or depression decorations) .
  • the membrane mould is also advantageously connected to the cooling unit.
  • machine 1 comprises a heating device 13, which is arranged upstream of deposition device 4 (along path P) and is adapted to heat article 2.
  • Heating device 13 is adapted to heat article 2, in particular to a temperature above 100 °C (advantageously above 130 °C, more precisely to 150°C) .
  • device 13 comprises an infrared radiation source (which is arranged above a segment of path P) to emit infrared radiations towards particles 5 deposited on surface 6.
  • device 13 comprises a plate (of the type known per se and not shown) which is heated (for example by a heating element) adapted to come into contact with surface 6.
  • a heating element for example by a heating element
  • heating device 13 is especially useful when surface 6 is not completely flat; in particular, when surface 6 has depressions and/or reliefs (for example, when article 2 is a panel provided with one or more relief or depression decorations) . In these cases, the heating of article 2 before the deposition of particles 5 allows particles 5 to also remain on portions of surface 6 which are not horizontal.
  • machine 1 comprises device 13 but not device 7.
  • device 13 also has the same function of device 7.
  • the heat of article 2 is sufficient to obtain layer L as defined above.
  • machine 1 comprises a heating device 14 , which is arranged downstream of surface treatment device 8 (along path P) .
  • Heating device 14 is adapted to heat article 2 to a temperature above 100°C (in particular above 130°C, more precisely to 150°C) .
  • device 14 comprises an infrared radiation source (which is arranged above a segment of path P) to emit infrared radiation towards layer L deposited on surface 6.
  • Machine 1 further comprises a cooling device 15, which is arranged downstream of device 8 (and of heating device 14 - along path P) and is adapted to cool the layer deposited on surface 6.
  • Device 15 comprises a fan to direct the air flow towards article 2.
  • device 4 comprises a deposition unit 4' .
  • device 4 comprises a plurality of deposition units 4' arranged in series along path P. This allows to obtain a better distribution of the particles on surface 6.
  • deposition unit (or each unit) 4' comprises a perforated element 16, which is arranged above path P and above at least part of which particles 5 are arranged.
  • Element 16 has a plurality of holes having diameter (slightly) larger than the size of particles 5; in particular, the diameter of the holes is larger than the average size of particles 5 and smaller than twice the average size of particles 5.
  • the diameter of the holes is from 60 ⁇ to 1.1 mm (advantageously from 0.4 to 0.45 mm) . According to some embodiments the diameter of the holes is from 70 ⁇ to 400 ⁇ . According to alternative embodiments, the diameter of the holes is from 250 ⁇ to 1 mm. According to specific embodiments, the holes are distributed so as to be from about 49 to about 144 holes per cm 2 .
  • element 16 is a belt, in particular made of laminated material (specifically polyethylene terephthalate) .
  • Element 16 has a thickness from 0.25 to 0.5 mm .
  • Unit 4' also comprises a pulley 17, about which element 16 is partially wound; a handling unit (known per se and not shown) to rotate pulley 17; and at least one transmission member 18, about which element 16 is partially wound and which has at least one opening 19 (facing downwards) .
  • Device 4 also comprises a feeding unit 20 to convey particles 5 between pulley 17 and transmission member 18 (above at least one segment of element 6) .
  • particles 5 collect above member 18 and pass through opening 19 and the holes of element 16 in virtue of the motion of element 16 (in particular the sliding on member 18) driven by pulley 17. Particles 5 exiting the holes are deposited on surface 6.
  • the holes on element 16 may be distributed so as to form patterns on surface 6. This is especially promoted where device 4 comprises several deposition units 4' . In these cases, particles of a second type (coming from a second unit 4') are deposited (or deposited in a greater amount) where particles 5 of a first type (coming from a first unit 4') are not deposited (or deposited in a smaller amount) .
  • the particles of the different types have, for example, different colours.
  • deposition unit (or each deposition unit) 4' comprises a conveyor 21 provided with a conveyor belt 22. As shown in greater detail in figure 5, which shows a section of belt 22, belt 22 has a plurality of cells 23, which are adapted to each house a relative particle 5. Deposition unit 4' also comprises a hopper 24, from which particles 5 are withdrawn. The withdrawal of particles 5 is allowed by the presence of cells 23. In use, withdrawn particles 5 are fed by conveyor 21 until they are dropped on surface 6.
  • unit (or each unit) 4' comprises a hollow cylindrical element 25, the outer wall 25' of which is provided with holes and which is arranged above path P.
  • a feeding unit 26 conveys particles 5 within cylinder 25 which by rotating allows particles 5 to pass through the holes of the outer wall 25' and be deposited on surface 6.
  • outer wall 25' is made of silk (a material which is naturally provided with small holes) . Also in this case, patterns may be obtained on surface 6 by distributing the holes in a specific manner. More precisely, when silk is used, part of the surface of the silk is coated (for example with a layer having a predetermined shape of photoresist material) .
  • conveying system 3 feeds articles 2 continuously along path P (in particular at a substantially constant speed) .
  • conveying system 3 comprises a plurality of rollers, which are spaced (slightly - i.e. at least so as to prevent articles from falling or make this unlikely), (at least) at deposition device 4.
  • particles 5 which should possibly not remain on surface 6 can freely fall and possibly be recovered and recycled. This is especially advantageous when conveying system 3 feeds articles 2 continuously and deposition device 4 is not stopped. Thereby, particles 5 which fall between two subsequent articles 2 may easily be recovered without creating substantial problems in the following processing steps.
  • Particles 5 which are possibly deposited on a conveyor belt could for example bind to the belt in the following processing steps.
  • Machine 1 shown in figure 1 is especially suitable for coating articles 2 when particles 5 comprising (in particular consisting of) at least one thermosetting pre-polymer are used. In this case a further heating after compression is required to harden layer L deposited on surface 6.
  • Figure 7 shows a variant of machine 1 which is different from that shown in figure 1, in not having heating devices 13 and 14 and cooling device 15.
  • This kind of machine is especially suitable for coating articles 2 when particles 5 comprising (in particular consisting of) a thermoplastic polymer are used.
  • a device 27 for producing combined particles 5 (i.e. made of composite material).
  • Device 27 may be connected to or may be part of machine 1.
  • Device 27 comprises two feeding units 28 and 28' which are structurally substantially identical to deposition unit 4' shown in figure 3.
  • Feeding units 28 and 28' define a common falling channel 29, towards which are conveyed particles 30 comprising (in particular consisting of) a substantially inert material and particles 5 comprising at least one organic binder, respectively.
  • Device 27 comprises a heating system adapted to heat particles 5 and/or 30 so as to allow the coupling of at least part of particles 5 with at least part of particles 30 and therefore obtain combined particles 5 (particles 5 each bound to - incorporating - a particle 30) .
  • Cooling Unit 31 to cool combined particles 5.
  • cooling unit 31 comprises a vibrating plate 32, which is arranged below channel 29 and on which, in use, combined particles 5 fall.
  • Plate 32 is adapted to vibrate so as to move particles 5 outwards and therefore let them fall on collecting system 33.
  • a method for producing combined particles 5 comprises a heating step, during which particles 30 comprising (in particular consisting of) a substantially inert material and/or particles 5 (comprising, in particular consisting of) at least one organic binder, are heated to a temperature above 50 °C (in particular above 80 °C) .
  • particles 30 and/or 5 are heated to a temperature below 100 °C.
  • Particles 5 are defined according to the fourth aspect of the present invention.
  • the method also comprises a coupling step, during which particles 30 and 5 are directed one against another so as to create combined particles 5.
  • Particles 30 and/or 5 have approximately the above indicated temperatures with respect to the heating step.
  • particles 30 have the above indicated temperatures with respect to the heating step (while particles 5 are at a room temperature) .
  • the coupling step at least partially (more specifically totally) follows the heating step.
  • the method comprises a cooling step, during which combined particles 5 are cooled (approximately at a room temperature) .
  • a cooling step during which combined particles 5 are cooled (approximately at a room temperature) .
  • combined particles 5 are mixed so as to disperse heat (and reduce the possibility of them binding to one another) .
  • the method is implemented by a device 27 as disclosed above.
  • the step of coupling is performed by feeding units 28 and 28' .
  • the cooling step is performed by cooling unit 31.
  • the substantially inert material is selected so that particles 30 cannot bind to one another if placed in contact and subjected to a temperature up to 200°C, at a pressure up to 100 Kg/cm 2 and in the absence of other elements .
  • the substantially inert material comprises (more specifically consists of) (at least) one inorganic material.
  • particles 30 comprise (specifically consist of) materials selected from the group consisting of: compounds of silicon, aluminium oxide (in particular corundum - A1 2 0 3 ) , aluminium hydroxide (and a combination thereof) .
  • the silicon compounds are silicates, more specifically (at least) one material selected from the group consisting of: glass, quartz, cristobalite (and a combination thereof) .
  • Cristobalite may be natural or artificial obtained by the processing of quartz sands in an oven at about 1880°K.
  • the silicates are selected from the group consisting of: glass, quartz (and a combination thereof) .
  • particles 30 comprise (specifically consist of) materials selected from the group consisting of: glass, quartz, aluminium hydroxide (and a combination thereof) .
  • Aluminium hydroxide may be particularly advantageous.
  • aluminium hydroxide may be cut by the same processing tools as wood.
  • particles 30 comprise (in particular consist of) marble particles, which in turn contain carbonates (in particular calcium carbonates) and/or silicates.
  • particles 30 have a size (i.e. diameter) of at least 20 ⁇ (advantageously at least 50 ⁇ ) .
  • particles 30 have a size (i.e. diameter) up to 5 mm (more precisely, up to 1 mm). More specifically, particles 30 have a size (i.e. diameter) up to 500 ⁇ (in particular, 250 urn) .
  • the size (as regards all particles cited in the present text) is obtained by subsequent sievings with sieves having holes displaying decreasing size (diameters) .
  • the diameters of the holes of the first sieve that does not allow the passage of the particles indicates the size (i.e. diameter) of the particles.
  • the measuring by following sievings is performed until the size (i.e. the diameters) of the particles and holes of the sieves allow to (in particular, up to a minimum of 0.05 mm) .
  • the size of the particles is measured as average diameter D(v,0.5) measured by means of a laser granulometer - in particular using a laser Mastersizer
  • a process to coat at least surface 6 of article 2 comprising: a deposition step, during which particles 5 having a size (i.e.
  • a first heating step during which particles 5 spread on surface 6 are heated so that the melting point of the organic binder is reached at least and a first layer L, which is partially liquid is obtained; a compression step, which at least partially follows the first heating step and during which first layer L is compressed against surface 6; a first cooling step, which is at least partially simultaneous to the compression step and during which the temperature of the first layer is reduced (in particular, below 80°C) .
  • the first cooling step is substantially simultaneous to the compression step.
  • the method usually also comprises a second cooling step, which at least partially follows the first cooling step and during which the temperature of first layer L is cooled to a room temperature so as to obtain a coating layer L.
  • the second cooling step is not performed by any thermal conditioning, but instead, for example, by only leaving article 2 at a room temperature .
  • the first and the second cooling steps take place one after another substantially continuously.
  • article 2 is a panel. It should be noted that surface 6 may not be (totally) flat. As a matter of fact, according to some embodiments, panel has depressions and/or reliefs (i.e., may be provided with one or more decorations in relief or recessed) .
  • Particles 5 comprise at least one organic binder.
  • the binder can melt at least partially at a temperature (has a melting point) below or equal to 200°C and above 60°, in particular above 100°C.
  • the binder can melt at least partially at a temperature (has a melting point) from 110°C to 130°C.
  • the melting point (temperature) is indicated in the present text as measured at a standard pressure (1 atm) .
  • the binder is selected from the group consisting of: thermoplastic polymers, thermosetting prepolymers (and a combination thereof) . It should be noted that thermoplastic polymers deriving from the recycling of waste plastic materials containing hard to separate impurities of other thermoplastic materials, may be used.
  • thermosetting prepolymers are materials which are still not totally polymerised and/or crosslinked, which first soften (melt) if heated and then harden in a substantially irreversible manner (i.e. if simply heated again, do not soften) .
  • the hardening is due to crosslinking reactions.
  • the binder comprises (in particular, consists of) a resin selected from the group consisting of: polyurethanes , polyesters (for example polylactic acid) , acrylic resins, methacrylic resins (and a combination thereof) .
  • the binder comprises (in particular consists of) a polyester.
  • the binder comprises (more in particular consists of) an epoxy-polyester (i.e. a combination of an epoxy resin and a polyester) .
  • particles 5 comprise (in particular consist of) particles of powder coating.
  • particles 5 comprise a thermosetting prepolymer.
  • Different suppliers of powder coatings which can be used without further modifications in the present process, are available on the market.
  • Tiger Tiger
  • An example of powder coating that may be used is the transparent epoxypolyester powder coating 530 by Tiger.
  • particles 5 comprise (in particular consist of) powder particles for dynamic rotomoulding .
  • particles 5 comprise a thermoplastic polymer.
  • Different suppliers for dynamic rotomoulding are available on the market, such as for example SDT (Brescia, Italy) .
  • An example of powder for dynamic rotomoulding is ICOPOLIMERS 3545 (powder polyethylene) by SDT.
  • particles 5 have a size (i.e. diameter) smaller than 2 mm (in particular, up to 1 mm) .
  • particles 5 have a size (i.e. diameter) larger than 50 urn.
  • particles 5 have a size (i.e. diameter) up to 500 ⁇ (more precisely up to 200 ⁇ , in particular up to 180 ⁇ ) .
  • particles 5 comprise (consist of) a thermosetting prepolymer.
  • particles 5 have a size (i.e. diameter) from 200 ⁇ (in particular up to 500 ⁇ ) .
  • particles 5 comprise (consist of) a thermoplastic polymer.
  • particles 5 comprise particles 30 as defined according to the third aspect of the present invention.
  • particles 5 comprise (in particular consists of) composite particles 5 as defined according to a third aspect of the present invention. It should be noted that composite particles 5 usually have a size (i.e. diameter) from 100 ⁇ (in particular from 200 ⁇ ) to about 1 mm (in particular, to 750 ⁇ ) .
  • particles 30 (separately or incorporated in composite particles 5) allows to obtain several advantages. Among these, we cite the followings: the possibility of producing thicker layers with lower costs; the possibility of obtaining special aesthetical effects (for example create materials that are aesthetically similar to marble) ; the possibility of increasing the resistance to scratches and/or the hardness of surface 6; the possibility of making the surface 6 draining and/or antislip.
  • particles 5 comprise from 5% to 80% (in particular, at least 20%) in weight, with respect to the overall weight of particles 5, of particles 30 (incorporated or separate). For some applications, it is advantageous to use particles 5 comprising at least 60% (in particular from 60% to 80%) in weight, with respect to the overall weight of particles 5, of particles 30 (separate or incorporated) .
  • Particles 5 comprise at least 15% (in particular from 15% to 95%; more in particular at least 20%) in weight, with respect to the overall weight of particles 5, of the organic binder. According to some embodiments, particles 5 comprise at least 50% (in particular from 50% to 95%; more in particular from 60% to 90%) in weight, with respect to the overall weight of particles 5, of the organic binder. According to alternative embodiments, particles 2 comprise from 20% to 40% in weight, with respect to the overall weight of particles 5, of organic binder.
  • particles 5 are heated so as to bind at least partially to one another.
  • particles 5 are heated at a temperature above 80°C (more precisely, above 100°C) .
  • particles 5 are heated to a temperature above 130°C (in particular, above 150°C) .
  • particles 5 are heated to a temperature below 250 °C (below this temperature some materials, for example wood, could catch fire) . More precisely, particles 5 are heated to a temperature below 200°C (in some cases, below 180°C) .
  • thermosetting pre-polymer in some cases (in particular, when a thermosetting pre-polymer is used) it is preferable to remain below 200°C (in particular below 180°C) .
  • particles 5 are heated to a temperature below 150 °C (in particular, below 130°C) .
  • thermosetting prepolymer should be avoided (at least minimised) .
  • a surface treatment device 8 comprises a compression assembly 9 having a contact surface 10, which comes into contact with first layer L and exerts a pressure on first layer L during the compression step and the first cooling step.
  • the pressure is at least 1.1 atm (advantageously 1.5 atm).
  • Surface treatment device 8 comprises a cooling unit, which cools the contact surface.
  • device 8 is as disclosed above according to the first aspect of the present invention.
  • layer L is advantageously taken to a temperature below 80 °C (in particular, below 50°C) . Specifically, the cooling should not proceed to below 15 °C. According to some embodiments, layer L is cooled to a temperature below 30°C (approximately room temperature) .
  • the process comprises a pre-heating step, during which article 2 is heated before the deposition step so as to reach a temperature above 100 °C (in particular above 120°C) .
  • the preheating step precedes (or is part) of the first heating step.
  • the pre-heating step is especially useful when surface 6 is not completely flat; in particular, when surface 6 has depressions and/or reliefs (for example, when article 2 is a panel provided with one or more relief or depression decorations) .
  • article 2 is heated to temperatures such as those defined relatively to the first heating step as regards particles 5.
  • particles 5 comprise at least one pigment.
  • particles 5 comprise from about 5% to about 50% (in particular from 10% to 40%) in weight, with respect to the overall weight of particles 5, of the pigment.
  • the process comprises a hardening step, which at least partially follows (in particular, follows) the first cooling step and at least partially precedes (in particular precedes) the second cooling step and during which the thermosetting prepolymer is hardened (polymerised and/or crosslinked) .
  • the hardening step comprises a second heating step, which at least partially follows (in particular, follows) the first cooling step and at least partially precedes (in particular, precedes) the second cooling step and during which the thermosetting prepolymer is heated to a temperature above or equal to its hardening temperature.
  • the thermosetting prepolymer is heated to a temperature as indicated with respect to the first heating step and/or to the preheating step.
  • the thermosetting prepolymer is heated to a temperature above 120 °C (and below 250°C) . More precisely, the thermosetting prepolymer is heated to a temperature of at least 130 °C (in particular of at least 150°C) .
  • Layer L which is deposited during the deposition step has a thickness of at least about 100 ⁇ .
  • a thickness of a few dozen millimetres for example up to 20 mm
  • layer L has a thickness up to 500 ⁇ (advantageously, up to 200 ⁇ ) .
  • article 2 comprises (more specifically consists of) a material selected from the group consisting of: composite plastic materials, alveolar materials, asbestos cement, plasterboard, glass, ceramics, wood (and a combination thereof).
  • article 2 comprises (more specifically consists of) a material selected from the group consisting of: glass, ceramics, wood (and a combination thereof) .
  • article 2 comprises (more specifically consists of) wood.
  • wood there is intended also any material comprising a wooden chipboard conglomerate.
  • the disclosed process is implemented by machine 1 of the first aspect of the present invention.
  • the deposition step is performed by deposition device 4.
  • the first heating step is performed by heating device 7.
  • the pre- heating step is performed by heating device 13.
  • the second heating step is performed by heating device 14.
  • the second heating step is performed by heating device 15.
  • patterns may be printed on layer L (for example by contact flexographic printing or by digital techniques of jet ink printing) .
  • Coloured layer L may possibly serve as background or base colour.
  • the pattern obtained thereby may be protected by depositing another layer L thereover by performing the same process disclosed above.
  • an at least partially coated article 2 obtained or obtainable by the process of the fourth aspect of the present invention is provided.
  • the known methodologies did not allow to obtain an article 2 which is qualitatively identical to that obtainable by the above disclosed process.
  • a medium-density fibreboard (MDF) was introduced in a preheated oven at a temperature of 150°C for about 3 minutes . It was then extracted from the oven and quickly coated with a layer of about 500 ⁇ of transparent epoxypolyester powder coating 530 by Tiger. The powder was previously sieved so as to eliminate particles having a size smaller than 50 ⁇ and was deposited by shaking a belt (mayler) with about 135 holes per cm 2 . The holes had a diameter of about 0.4 mm and were obtained by means of a laser.
  • the coated fibreboard was compressed by means of a chromed roller and subsequently introduced again in the oven at a temperature of 150 °C for 4 minutes (so as to obtain a complete hardening of the powder) .
  • the resulting coating layer was tested and proved very strong. Detachment was obtained only with the simultaneous removal of wooden particles. This proves that the layer was bound with a greater force than the cohesion of the components of the board.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)
  • Glass Compositions (AREA)

Abstract

La présente invention concerne un procédé pour enduire une surface (6) d'un article (2) ; le procédé comprend l'application sur la surface (6) de particules (5) ayant une taille de 20 μm à 11 μm, l'application d'un chauffage jusqu'à au moins 100 °C et ensuite la compression et, simultanément, le refroidissement au-dessous de 50 °C ; une couche résistante (L) fixée très fortement à l'article est obtenue d'une manière simple et économique.
EP10809167A 2009-12-04 2010-12-06 Procédé pour enduire un article Withdrawn EP2506986A2 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
ITPS2009A000023A IT1397259B1 (it) 2009-12-04 2009-12-04 Decorazione e smaltatura di protezione su biscotto ceramico o vetro in risparmio di energia; nobilitazione di altre superfici grezze di materiali diversi quali conglomerati legnosi o lapidei con contemporanea dotazione di finiture opache o lucide , o goffrate. processo , macchina , elementi ottenuti.
PCT/IB2010/003112 WO2011067664A2 (fr) 2009-12-04 2010-12-06 Procédé pour enduire un article

Publications (1)

Publication Number Publication Date
EP2506986A2 true EP2506986A2 (fr) 2012-10-10

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ID=42334641

Family Applications (1)

Application Number Title Priority Date Filing Date
EP10809167A Withdrawn EP2506986A2 (fr) 2009-12-04 2010-12-06 Procédé pour enduire un article

Country Status (3)

Country Link
EP (1) EP2506986A2 (fr)
IT (1) IT1397259B1 (fr)
WO (1) WO2011067664A2 (fr)

Family Cites Families (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4228514A1 (de) * 1992-08-27 1994-03-03 Hoechst Ag Bindemittel für Pulverlacke
DK0670780T3 (da) * 1992-11-24 1996-09-16 Casco Nobel Ab Kompositfilm
US6554899B1 (en) * 1998-11-17 2003-04-29 Madison-Oslin Research Corp. Paper coating apparatus
GR1004063B (el) * 2002-05-10 2002-12-19 Γεωργια Νικολαου Καριπιδου Μηχανη πλαστικης διαμορφωσης αμορφης μαζας παστελιου
JP2004107834A (ja) * 2002-09-19 2004-04-08 Fuji Photo Film Co Ltd 粉体塗布型支持体の製造方法及び粉体塗布型支持体
ITBO20030024A1 (it) * 2003-01-17 2004-07-18 Canti & Figli Srl Procedimento e macchina per il rivestimento di elementi
ES2339621B1 (es) * 2007-05-14 2011-01-04 Jesus Fco. Barberan Latorre Maquina de aplicacion de cola y barniz sobre laminas para cubrimientos.
US20090197089A1 (en) * 2008-01-31 2009-08-06 Joel Klippert Compact laminate having powder coated surface
WO2009113204A1 (fr) * 2008-03-14 2009-09-17 名古屋油化株式会社 Feuille de démoulage et articles moulés
GB2458963B (en) * 2008-04-05 2012-06-06 Trade Fabrication Systems Ltd A method for manufacturing a coated timber panel
EP2153911A1 (fr) * 2008-08-05 2010-02-17 Pulverit S.p.A. Procédé de peinture/revêtement utilisant une couche primaire en poudre hautement réactif, polymérisable en une seule étape avec la couche de finition

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2011067664A2 *

Also Published As

Publication number Publication date
ITPS20090023A1 (it) 2011-06-05
WO2011067664A2 (fr) 2011-06-09
WO2011067664A3 (fr) 2011-11-17
IT1397259B1 (it) 2013-01-04

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