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WO1997010903A1 - Procede de revetement d'un produit - Google Patents

Procede de revetement d'un produit Download PDF

Info

Publication number
WO1997010903A1
WO1997010903A1 PCT/FI1995/000519 FI9500519W WO9710903A1 WO 1997010903 A1 WO1997010903 A1 WO 1997010903A1 FI 9500519 W FI9500519 W FI 9500519W WO 9710903 A1 WO9710903 A1 WO 9710903A1
Authority
WO
WIPO (PCT)
Prior art keywords
product
die
layer
coating
cooling
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.)
Ceased
Application number
PCT/FI1995/000519
Other languages
English (en)
Inventor
Pentti JÄRVELÄ
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to PCT/FI1995/000519 priority Critical patent/WO1997010903A1/fr
Publication of WO1997010903A1 publication Critical patent/WO1997010903A1/fr
Anticipated expiration legal-status Critical
Ceased 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
    • 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
    • B05D1/26—Processes for applying liquids or other fluent materials performed by applying the liquid or other fluent material from an outlet device in contact with, or almost in contact with, the surface
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/03—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor characterised by the shape of the extruded material at extrusion
    • B29C48/07—Flat, e.g. panels
    • B29C48/08—Flat, e.g. panels flexible, e.g. films
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B29—WORKING OF PLASTICS; WORKING OF SUBSTANCES IN A PLASTIC STATE IN GENERAL
    • B29C—SHAPING OR JOINING OF PLASTICS; SHAPING OF MATERIAL IN A PLASTIC STATE, NOT OTHERWISE PROVIDED FOR; AFTER-TREATMENT OF THE SHAPED PRODUCTS, e.g. REPAIRING
    • B29C48/00—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor
    • B29C48/15—Extrusion moulding, i.e. expressing the moulding material through a die or nozzle which imparts the desired form; Apparatus therefor incorporating preformed parts or layers, e.g. extrusion moulding around inserts
    • B29C48/154—Coating solid articles, i.e. non-hollow articles
    • 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

Definitions

  • the invention relates to a method for coating a product, which method is presented in the preamble of the appended claim 1.
  • This idea relates particularly to coating of wood or wood-based prod ⁇ ucts (not paper), such as a continuous board or single boards, with a thermoplastic polymer, such as a thermoplastic, in molten state.
  • thermosetting plastics which can be used for coating wooden boards in their normal manufacturing process.
  • Thermosetting plastics involve a number of problems in composite technology, and for this reason their use is becoming less and less common.
  • Thermoplastic polymers and composites based on them are replacing thermosetting plastics, mainly for the following reasons: increased number of potential polymers, more possibilities with respect to properties, no storage problems, and reduced problems of disposal / recycling.
  • Finnish Patent No. 80637 discloses a method for coating a wooden board by using an extrusion die to produce a web of molten polymer which is then pressed for attachment against the board to be coated. Even with a short open time, a thermoplastic plastic is usually cooled down in such a degree that the viscosity will increase, making it more difficult to produce a smooth and even coating onto an uneven surface.
  • the purpose of the present invention is to disclose a method for coating a stiff product, such as wooden board or wood-based panel, with melt processing techniques of thermoplastic polymers, i.e. thermoplastics and thermoelastics without prior drying in an oven or without a layer of vapour barrier, the method eliminating the above problems which in the worst case may cause poor adhesion and problems of appearance.
  • a stiff product such as wooden board or wood-based panel
  • the in ⁇ vention relates to a method, known as such, where from a die situated against the product applying a molten thermoplastic material is applied onto the surface of the piece, but wherein the pressing surface after the die acts also as a cooling surface which, simultaneously when prevent ⁇ ing the free expansion of the layer away from the surface to be coated and the formation of bubbles, causes congealing of the layer.
  • cooling devices such as cooling rolls, presented e.g. in US Patent No. 4,143,187, but coating and cooling are in practice one and the same operation.
  • a device 6 is placed against the product 1 to be coated, the device comprising a die 3 opening towards the piece and feeding molten thermoplastic polymer, such as a thermoplastic, onto the surface of the piece.
  • molten thermoplastic polymer such as a thermoplastic
  • one edge of the orifice of the die 3 extends as a cooling and pressing surface 4 of a determined length, which while being at a certain distance from the surface of the product 1 simultaneously determines the thickness of the layer 2 to be formed between the surface of the product 1 and the cooling and pressing surface 4 facing the same.
  • the cooling and pressing surface prevents the free upward expansion of the layer which would allow the formation of bubbles, and simultaneously cools down the layer rela ⁇ tively fast.
  • the product 1 can be subjected to a pretreatment, e.g. an operation improving the adhesion of the surface, such as heating, oxidi ⁇ zation, corona treatment, flame treatment, or the like, and this optional pretreatment is indicated with an arrow 8.
  • a pretreatment e.g. an operation improving the adhesion of the surface, such as heating, oxidi ⁇ zation, corona treatment, flame treatment, or the like, and this optional pretreatment is indicated with an arrow 8.
  • the die 3 comprises a prelimi ⁇ nary chamber 3a for receiving the molten material, a choke 3b at the terminal end of the preliminary chamber, and an expanded melt cham ⁇ ber 3c located underneath the choke and opening against the surface of the product over the width of the area to be coated, the orifice of the same forming the actual die orifice.
  • an air gap 9 is left which is so small that the molten thermoplastic will not flow backwards, thanks to the high flow resistance.
  • the figure shows also cooling pipes 7 above the cooling surface 4, whereby the layer 2 to be formed can be quickly cooled by means of a cooling agent, e.g.
  • thermoplastic polymers this change from the molten material must take place in connection with the cooling and pressing surface 4 in such a degree that the layer 2 is dimensionally stable against pressurized gas and/or vapour bubbles tending to penetrate it, e.g. at least up to an overpressure of 50 kPa.
  • crystalline or partly crystalline polymers such as polypropylene and polyethylene
  • a gaseous substance increasing reactivity such as air, oxygen, ozone or a corresponding oxidizing agent
  • a separate preliminary chamber 3a and melt chamber 3c are not nec ⁇ essarily required, but the die can be constructed as a straight die con ⁇ nected with the extruder, opening against the product 1 to be coated.
  • broken Iines indicate the possibility to combine a means for producing pressure with the cooling and pressing surface 4, such as a roll 10, which can be located after the die 3 and before the cooling pipes 7 and which is loaded against the layer 2 with a certain force F.
  • the roll can be arranged in the construction of the device 6 in a way that its circumferential surface forms at one point part of the cooling and pressing surface 4.
  • a loading structure extend ⁇ ing over a longer distance is feasible, such as an endless track struc ⁇ ture, or the whole section incorporating the pressing surface 4 can be loaded.
  • the thermoplastic can be melted (plastified) by some method into a homogeneous mass having a desired viscosity.
  • plastif ication any extruder type can be used. If various additives must be added into the thermoplastic during the plastification phase, the mixing apparatus is selected accordingly.
  • the plastic can be blended for modifying the coating properties. For example, crosslinking agents can be added into the plastic for crosslinking of the coating. Chemical or physical foaming agents can be added into the plastic for foaming of the coating.
  • the product 1 to be coated passes the melt chamber 3c above the same, receiving simultaneously a thermoplastic layer with a controlled thickness on its surface.
  • the product to be coated can be moved in a channel located between the supporting base of the piece and the cooling and pressing surface 4 and having a desired total thickness, as long as the thermoplastic coating is congealed in such a degree that it is subject to no other de- formations caused by cooling than shrinkage.
  • the surface 4 may also comprise a roll for providing a suitable pattern or text on the coating.
  • the figure illustrates by a broken line 12 a heat insulator between the part comprising the die 3 and the part comprising the cooling and pressing surface 4, to avoid harmful transfer of heat from the molten mass in the die 3 along the structure of the device 6 in the direction of the cooling surface.
  • a heat insulator between the part comprising the die 3 and the part comprising the cooling and pressing surface 4, to avoid harmful transfer of heat from the molten mass in the die 3 along the structure of the device 6 in the direction of the cooling surface.
  • an air gap is conceivable as the heat insulator 12, but in a way that the continuity of the surface 4 is se ⁇ cured through an insulating section at this point.
  • the supporting base of the product 1 can be an ordinary conveyor 5.
  • the distance between the device 6 and the supporting base is adjust ⁇ able according to the thickness of the product and the desired coating layer.
  • the method has the following advantages which will be manifested particularly when coating a wooden piece:
  • the molten thermoplastic is applied on the surface of the wooden piece without a so-called air gap (open time), dur ⁇ ing which the thermoplastic is usually cooled to such an ex ⁇ tent that the viscosity and adhesion of the molten plastic are substantially reduced.
  • This situation is fully known from pa ⁇ perboard coating, but it cannot be eliminated in that proc ⁇ ess, because the process involves very strong thinning of the coating film after leaving the die.
  • the method of the in ⁇ vention relates particularly to coatings with a thickness of 0.5 to 3 mm, whereby no thinning is required after the die.
  • the molten plastic is at no stage before the coating operation itself in any contact with air (oxygen) in an uncontrolled manner, whereby the properties of the mass cannot be impaired by the action of oxygen.
  • a plastified thermoplastic is applied on the surface of a wooden piece, whereby the fluidity is still very good at the time of coating.
  • This makes it possible to achieve a fully even coating on an uneven surface.
  • This is not possible in normal extrusion coating, because at the time when the extrusion-coating layer enters the surface, its viscosity is already so high that it is difficult to achieve an even coating on an uneven surface.
  • the un- even surface refers to natural defects of a wooden surface.
  • the coating is forced to congeal in a channel according to a desired final thickness.
  • meth ⁇ ods for coating with a thermoplastic are characterized by the following phenomenon: The temperature of the coating at the stage when it is applied on the surface to be coated, is usually much higher than 100°C. It is known from both ex ⁇ trusion coating and spray coating that in a porous material which may also contain moisture (wood usually contains a few percent of moisture), expansion of gases and vaporiza ⁇ tion of water takes place by the action of heat from the coating. This may have the effect that the thermoplastic coating in a plastified state starts to bubble. Now when the expansion of the coating is prevented also during the whole cooling operation over a certain distance in the running di ⁇ rection of the material, it is not possible for the material to bubble.
  • the material used can be any polymer work ⁇ able in a molten state, such as a thermoplastic plastic or a thermoplastic elastomer or a composite based on these.
  • This method can be combined with any possible way of modifying the surface of the wood before coating, such as flame, corona, electron beam, heating, drying, vacuuming etc.
  • this method allows the use of substantially lower melt temperatures, be ⁇ cause the actual adhesion to the piece, such as a wooden board, takes place in the molten state and not after a certain air gap.
  • this coating technique allows the use of materials with a substantially higher molecular weight
  • the molten polymer to be applied on the sur- face can also be very hot, whereby its viscosity is as low as possible and penetration into the uneven surface of the board to be coated is thus excellent. Further, a sufficient quantity of coating is supplied from the die. Consequently, this method can be used to cover the defects on the surface of the board to be coated very well.
  • This method can be used in the manufacture of coated wooden boards having both the good properties of wooden boards (strength, light weight, low price, availability) and the properties of thermoplastics (almost any combination of properties).
  • the invention is not limited to the coating of wood only, but it can be used in coating other materials as well.
  • the invention is particularly well suited for the coating of all stiff plate-like pieces, particularly porous pieces.
  • a birch plywood board was coated in different tests with a polypropyl ⁇ ene film of 1 to 2 mm in thickness by a die shown in the figure.
  • the temperature of the molten material varied in the range between 280 and 320°C.
  • the peel strength of the film was measured by pulling it in a perpendicular direction away from the surface, and the strength values were 1 to 2 N/mm for polypropylene and 2 to 2.5 N/mm for polypropyl ⁇ ene mixed with a maleic acid anhydride modified polypropylene.
  • splinters from the coated substrate were left on the lower film surface of each coating, which shows the strength of the joint.

Landscapes

  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Extrusion Moulding Of Plastics Or The Like (AREA)
  • Laminated Bodies (AREA)
  • Application Of Or Painting With Fluid Materials (AREA)

Abstract

Selon un procédé de revêtement d'un produit, il est appliqué une couche (2) d'un polymère thermoplastique, notamment, sur la surface d'un produit (1) poreux et/ou contenant de l'humidité, par exemple une planche en bois. Une tuyère de coulée (3), placée contre la surface du produit (1), sert à l'approvisionnement en polymère thermoplastique fondu, à la suite de quoi la couche (2) est formé lorsque le produit et une surface de refroidissement et de pressage (4) se trouvant en arrière de la tuyère se déplacent relativement l'un à l'autre. Une couche masquée (2) est ainsi formée au moment du déplacement contre la surface de refroidissement et de pressage (4) empêchant, derrière la tuyère de coulée (3), le matériau constituant la couche de se dilater dans une direction perpendiculaire à la surface de l'article à revêtir.
PCT/FI1995/000519 1995-09-22 1995-09-22 Procede de revetement d'un produit Ceased WO1997010903A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI1995/000519 WO1997010903A1 (fr) 1995-09-22 1995-09-22 Procede de revetement d'un produit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI1995/000519 WO1997010903A1 (fr) 1995-09-22 1995-09-22 Procede de revetement d'un produit

Publications (1)

Publication Number Publication Date
WO1997010903A1 true WO1997010903A1 (fr) 1997-03-27

Family

ID=8556626

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/FI1995/000519 Ceased WO1997010903A1 (fr) 1995-09-22 1995-09-22 Procede de revetement d'un produit

Country Status (1)

Country Link
WO (1) WO1997010903A1 (fr)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096256A3 (fr) * 2000-06-13 2002-05-23 Meinhard Meier Element de construction realise sous forme de panneau, de barre ou de corps moule en fibres naturelles ou copeaux naturels lies par un liant, et se presentant sous forme de produit semi-fini ou de produit fini ainsi que procede de production et procede de traitement de surface ou de reparation de surface de tels corps moul
EP1347867A4 (fr) * 2000-11-23 2005-04-27 Hi Tech Engineering Ltd Produits composites
EP1533043A1 (fr) * 2003-11-21 2005-05-25 Parkett Franz GmbH Procédé et installation pour revêtir du bois ou des matériaux en bois
EP1637235A3 (fr) * 2004-09-10 2006-05-03 Kurt Meinberg Application des revêtements en poudre sur un plateau de meuble en bois
EP2360016A1 (fr) * 2009-11-05 2011-08-24 Metsäliitto Osuuskunta Revêtement de produits rigides à base de bois aviec un polymère thermoplastique
EP2364849A1 (fr) * 2009-11-05 2011-09-14 Metsäliitto Osuuskunta Revêtement de produits rigides à base de bois avec un polymère thermoplastique
RU2668435C2 (ru) * 2013-05-17 2018-10-01 К-Холдинг С.П.А. Способ и устройство для формирования кромок гофрированной пластиковой панели и панель, изготовленная с использованием такого способа

Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544669A (en) * 1966-12-10 1970-12-01 Schock & Co Gmbh Method of coating moisture-containing articles of wood or wood products
US3619320A (en) * 1967-09-07 1971-11-09 Basf Ag Production of plane three-ply materials for plane building components
US4143187A (en) * 1977-12-01 1979-03-06 Du Pont Of Canada Limited Process for coating sheet substrates with thermoplastic polymer
FI80637B (fi) * 1988-11-18 1990-03-30 Neste Oy Foerfarande foer belaeggning av skivformiga produkter med en termoplastisk polymer.

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3544669A (en) * 1966-12-10 1970-12-01 Schock & Co Gmbh Method of coating moisture-containing articles of wood or wood products
US3619320A (en) * 1967-09-07 1971-11-09 Basf Ag Production of plane three-ply materials for plane building components
US4143187A (en) * 1977-12-01 1979-03-06 Du Pont Of Canada Limited Process for coating sheet substrates with thermoplastic polymer
FI80637B (fi) * 1988-11-18 1990-03-30 Neste Oy Foerfarande foer belaeggning av skivformiga produkter med en termoplastisk polymer.

Cited By (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2001096256A3 (fr) * 2000-06-13 2002-05-23 Meinhard Meier Element de construction realise sous forme de panneau, de barre ou de corps moule en fibres naturelles ou copeaux naturels lies par un liant, et se presentant sous forme de produit semi-fini ou de produit fini ainsi que procede de production et procede de traitement de surface ou de reparation de surface de tels corps moul
EP1347867A4 (fr) * 2000-11-23 2005-04-27 Hi Tech Engineering Ltd Produits composites
AU2002224246B2 (en) * 2000-11-23 2007-07-12 Hi-Tech Engineering Limited Composite products
EP1533043A1 (fr) * 2003-11-21 2005-05-25 Parkett Franz GmbH Procédé et installation pour revêtir du bois ou des matériaux en bois
WO2005049225A1 (fr) * 2003-11-21 2005-06-02 Parkett Franz Gmbh Procede et dispositif pour enduire du bois ou d'autres materiaux derives du bois
EP1637235A3 (fr) * 2004-09-10 2006-05-03 Kurt Meinberg Application des revêtements en poudre sur un plateau de meuble en bois
EP2360016A1 (fr) * 2009-11-05 2011-08-24 Metsäliitto Osuuskunta Revêtement de produits rigides à base de bois aviec un polymère thermoplastique
EP2364849A1 (fr) * 2009-11-05 2011-09-14 Metsäliitto Osuuskunta Revêtement de produits rigides à base de bois avec un polymère thermoplastique
RU2668435C2 (ru) * 2013-05-17 2018-10-01 К-Холдинг С.П.А. Способ и устройство для формирования кромок гофрированной пластиковой панели и панель, изготовленная с использованием такого способа

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