LU101631B1 - Method for the manufacture of a floor plank with a wooden based substrate - Google Patents

Method for the manufacture of a floor plank with a wooden based substrate Download PDF

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Publication number
LU101631B1
LU101631B1 LU101631A LU101631A LU101631B1 LU 101631 B1 LU101631 B1 LU 101631B1 LU 101631 A LU101631 A LU 101631A LU 101631 A LU101631 A LU 101631A LU 101631 B1 LU101631 B1 LU 101631B1
Authority
LU
Luxembourg
Prior art keywords
coating
layer
optionally
substrate
upper layer
Prior art date
Application number
LU101631A
Other languages
French (fr)
Inventor
Branko Bugarcic
Stojanovic Irena Brankov
Original Assignee
Tarkett Gdl Sa
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 Tarkett Gdl Sa filed Critical Tarkett Gdl Sa
Priority to LU101631A priority Critical patent/LU101631B1/en
Priority to PCT/EP2021/052496 priority patent/WO2021156280A1/en
Application granted granted Critical
Publication of LU101631B1 publication Critical patent/LU101631B1/en

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Classifications

    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/10Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material
    • B32B3/14Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by a discontinuous layer, i.e. formed of separate pieces of material characterised by a face layer formed of separate pieces of material which are juxtaposed side-by-side
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/04Manufacture of substantially flat articles, e.g. boards, from particles or fibres from fibres
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N7/00After-treatment, e.g. reducing swelling or shrinkage, surfacing; Protecting the edges of boards against access of humidity
    • B27N7/005Coating boards, e.g. with a finishing or decorating layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/02Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board the layer being formed of fibres, chips, or particles, e.g. MDF, HDF, OSB, chipboard, particle board, hardboard
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/042Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of wood
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/04Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material
    • B32B21/08Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/13Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board all layers being exclusively wood
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B21/00Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board
    • B32B21/14Layered products comprising a layer of wood, e.g. wood board, veneer, wood particle board comprising wood board or veneer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B3/00Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form
    • B32B3/02Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions
    • B32B3/06Layered products comprising a layer with external or internal discontinuities or unevennesses, or a layer of non-planar shape; Layered products comprising a layer having particular features of form characterised by features of form at particular places, e.g. in edge regions for securing layers together; for attaching the product to another member, e.g. to a support, or to another product, e.g. groove/tongue, interlocking
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/06Embossing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B38/00Ancillary operations in connection with laminating processes
    • B32B38/14Printing or colouring
    • B32B38/145Printing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B44DECORATIVE ARTS
    • B44CPRODUCING DECORATIVE EFFECTS; MOSAICS; TARSIA WORK; PAPERHANGING
    • B44C5/00Processes for producing special ornamental bodies
    • B44C5/04Ornamental plaques, e.g. decorative panels, decorative veneers
    • B44C5/043Ornamental plaques, e.g. decorative panels, decorative veneers containing wooden elements
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • E04F15/10Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials
    • E04F15/102Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials of fibrous or chipped materials, e.g. bonded with synthetic resins
    • EFIXED CONSTRUCTIONS
    • E04BUILDING
    • E04FFINISHING WORK ON BUILDINGS, e.g. STAIRS, FLOORS
    • E04F15/00Flooring
    • E04F15/02Flooring or floor layers composed of a number of similar elements
    • E04F15/10Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials
    • E04F15/107Flooring or floor layers composed of a number of similar elements of other materials, e.g. fibrous or chipped materials, organic plastics, magnesite tiles, hardboard, or with a top layer of other materials composed of several layers, e.g. sandwich panels
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B27WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27NMANUFACTURE BY DRY PROCESSES OF ARTICLES, WITH OR WITHOUT ORGANIC BINDING AGENTS, MADE FROM PARTICLES OR FIBRES CONSISTING OF WOOD OR OTHER LIGNOCELLULOSIC OR LIKE ORGANIC MATERIAL
    • B27N3/00Manufacture of substantially flat articles, e.g. boards, from particles or fibres
    • B27N3/02Manufacture of substantially flat articles, e.g. boards, from particles or fibres from particles
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2250/00Layers arrangement
    • B32B2250/022 layers
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/08Coating on the layer surface on wood layer
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/26Polymeric coating
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2255/00Coating on the layer surface
    • B32B2255/28Multiple coating on one surface
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2307/00Properties of the layers or laminate
    • B32B2307/40Properties of the layers or laminate having particular optical properties
    • B32B2307/402Coloured
    • B32B2307/4023Coloured on the layer surface, e.g. ink
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B32LAYERED PRODUCTS
    • B32BLAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
    • B32B2471/00Floor coverings

Landscapes

  • Engineering & Computer Science (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Wood Science & Technology (AREA)
  • Architecture (AREA)
  • Manufacturing & Machinery (AREA)
  • Forests & Forestry (AREA)
  • Civil Engineering (AREA)
  • Structural Engineering (AREA)
  • Floor Finish (AREA)

Abstract

A method for the manufacture of a floor plank (1), comprising at least the following successive steps: - obtaining a substrate (2) comprising a core layer (3) and a wood based upper layer (4) formed with several pieces (4A, 4B) of veneer or wooden lamellas paving the core layer; - optionally sanding an upper surface (13) defined by the upper layer; - embossing, or embossing and brushing the optionally sanded upper surface of the upper layer; - applying a coating (5) on the substrate, wherein the coating contains a hardener; - optionally applying a primer layer (7) on an upper surface (19) of the coating; - digitally printing a decor (9) on the primer layer (7) or the coating (5); and - applying a top coat (11) on the decor (9). Corresponding floor plank.

Description

Method for the manufacture of a floor plank with a wood based substrate The present invention deals with a method for manufacturing a floor plank planks with a substrate, notably panels and boards, in particular wood based or thermoplastic based substrates on which a décor is formed by digital printing.
The invention also deals with a floor plank with a wood based substrate, obtainable using such a method.
Digital printing refers to methods of printing from a digital based image directly to the substrate. It usually refers to professional printing where small run jobs from desktop publishing and other digital sources are printed using large format and/or high volume laser or inkjet printers. Digital printing has a higher cost per printed object than traditional offset printing methods but this price is usually offset by the cost saving achieved by avoiding all the technical steps in between needed to make printing plates.
In order to obtain high quality, the décor may be printed on a separate support of paper or fleece which is applied onto the substrate. Indeed, while a basic layer may be applied in order to ensure sufficient adherence of the applied inks, such basic layers may affect the printing quality. Indeed, a porous layer may absorb the ink leading to insufficient covering while a non-porous basic layer may lead to their coalescence and affect color quality. The use of a separate support for printing however makes the process more costly and complex.
Usually the substrate comprises a core layer made preferably from wood or thermoplastic material and an upper layer which is made of wood or derived from wood. When the upper layer thickness is relatively small and lies for example between 0.5 and
2.5 mm, it is usually referred to as “veneer”, and when the thickness is larger, for example between 2.5 and 4 mm it is usually referred to as ‘wooden lamellas’. This upper layer is selected for having a nice aspect, devoid of any visible imperfections.
In a known solution, a single piece of veneer or wooden lamella covers the core layer of the plank. In this case, the dimensions of the veneer are those of the plank, typically 2 m x 18-22 cm with a thickness of 0.5-2.5 mm (veneer) or 2.5-4.0 mm.
As a consequence, the upper layer, and consequently the plank, are rather expensive. In order to obtain planks at a more competitive cost, several pieces of veneer or wooden lamellas are used for covering the core layer. In this solution, each single piece has a smaller surface than the plank. For a same quality, these smaller pieces cost less than the large ones, so that production costs are decreased. However, the visual aspect | 35 of the plank is less qualitative, since the junctions between the pieces of veneer or
| Co.
2 LU101631 wooden lamellas tend to remain visible, which gives the user an impression of lower quality.
À technique consisting in applying a fist layer containing a hardener and a second layer containing a filler on the pieces of veneer or the wooden lamellas has been used for efficiently hiding the junctions and obtaining planks with a smooth surface. However, the obtained planks still lack realism compared with real wood. Embossing and brushing are techniques known for providing surfaces with reliefs. However, they are also known, when applied on several adjacent pieces of veneer or wooden lamellas, for making the junctions more visible. An aim of the invention is to provide a floor plank at a competitive cost and having an improved wooden aspect to the user. To this end, the invention proposes a method for the manufacture of a floor plank, comprising at least the following successive steps: - Obtaining a substrate comprising a core layer and a wood based upper layer formed with several pieces of veneer or wooden lamellas paving the core layer; - optionally sanding an upper surface defined by the upper layer; - embossing, or embossing and brushing the optionally sanded upper surface of the upper layer; - applying a coating on the substrate, wherein the coating contains a hardener; - optionally applying a primer layer on an upper surface of the coating; - digitally printing a décor on the primer layer or the coating; and - applying a top coat on the décor. In other embodiments, the method may comprise one or several of the following features, taken in isolation or any technically feasible combination: - the core layer comprises a material chosen from the group consisting of HDF, MDF, soft wood ribs, cardboards, a thermoplastic materials, and composite materials; - the hardener comprises an isocyanate; - the hardener comprises a mix of hexane,1,6-diisocyanato-homopolymer and hexamethylene-di-isocyanate; - the step of digitally printing includes a multipass digital printing; - the upper layer has a thickness comprised between 0.5 and 4 mm; - the coating has a specific weight comprised between 10 and 50 g/m? - the coating has a thickness comprised between 5 and 10 um; - the primer layer is white; - the step of digitally printing includes a multipass digital printing; and - the step of digitally printing is carried out using UV ink or water-based ink.
| © 3 LU101631 The invention also relates to a floor plank successively comprising: - a substrate comprising a core layer, and a wood based upper layer formed with several pieces of veneer paving the core layer, the upper layer defining an upper surface being optionally sanded and being embossed, brushed, or embossed and brushed; - a coating located on the upper surface of the upper layer and containing a hardener, the coating defining an upper surface optionally sanded, - optionally a primer layer located on the upper surface of the coating; - a décor digitally printed on the primer layer or on the coating; and - a top coat located on the décor.
The invention and its advantages will be better understood upon reading the following description, given solely by way of example and with reference to the appended drawing, in which the Figure is a schematic cross sectional view of a floor plank according to the invention.
With reference to the Figure, a floor plank 1 according to the invention is described.
The floor plank 1 has a thickness E along a direction N perpendicular to the floor plank. The floor plank 1, in view along the direction N, may have any shape allowing paving a floor (not represented): rectangular, square, triangular, hexagonal...etc. The floor plank 1 is intended to be applied on a floor adjacent to other planks (not represented) having the same shape or composition, or different ones.
Advantageously the floor plank 1 includes locking tabs (knows in themselves and not represented) enabling to connect it to adjacent planks.
Successively in the direction N, the floor plank 1 comprises a substrate 2, a coating 5, optionally a primer layer 7 located on the coated substrate, a décor 9 digitally printed on the primer layer, and a top coat 11 located on the décor.
The substrate 2 comprises a core layer 3 (partially represented), and an upper layer 4 applied on the core layer. The thickness of the substrate 2 for example ranges from 6 to 20 mm and is preferably around 15 mm. For example, the thickness of the substrate 2 is
14.8 mm.
The substrate 2 has an upper surface 13 which has advantageously been sanded, in order to promote the adherence between the substrate and the coating 5.
The core layer 3 is made from a material that may be chosen from the group consisting of wood (HDF, MDF, soft wood ribs), cardboards, thermoplastic (PVC based, polyolefin based) material, and composite materials (WPC Wood Plastic Composite).
a | 4 LU101631 In a preferred embodiment, the core layer 3 is obtained from panels or boards, in particular wood based boards, for example of the type used to form engineered wood as described in WO 2018/077636.
The upper layer 4 is for example formed by several pieces of veneer or wooden lamellas paving the core layer 2, of which two pieces 4A, 4B are represented on the Figure. However, the floor plank 1 may have more than two pieces of veneer or wooden lamellas.
The upper layer 4 is for example made of wood, or derived from wood. The veneer or wooden lamellas are selected for having a nice aspect, normally devoid of any visible imperfections.
The upper layer 4 for example has a thickness comprised between 0.5 and 4 mm.
The pieces forming the upper layer 4 are adjacent to each other perpendicularly to the direction N in order to cover the core layer 3.
The two pieces 4A, 4B defines a junction 4C between themselves.
Preferentially, the pieces 4A, 4B are attached to the core layer 3 by an adhesive.
In a most preferred embodiment the pieces 4A, 4B are additionally glued the one with the other by their edges.
The upper surface is embossed, or embossed and brushed. This aims at providing the upper surface 13 with reliefs 15 simulating the depressions located at the surface of a natural wood plank.
The brushing, if any, is performed after the embossing and allows to open the pores of the wood with very low pressure and results in smoothening the surface 13 that has been embossed. The brushing also helps for adhesion of the top surface (lacquer).
The embossments 15 advantageously have a depth between 20 um and 1 mm in the upper layer 4.
The coating 5 is located on the upper surface 13. The coating 5 has an upper surface 19 which has advantageously been sanded. The coating 5 for example has thickness between 5 and 10 um, and advantageously a specific weight comprised between 10 and 50 g/m?.
The coating 5 contains a hardener and has been cured by UV rays.
In a particular embodiment, the coating 5 only contains the hardener.
The hardener is for example an additive, preferably an isocyanate which advantageously reacts with the moisture of wood fibers of the core layer 3.
The hardener promotes the bound between wood fibers and the coating 15. The hardener may contain a mix of hexane,1,6-diisocyanato-homopolymer and/or hexamethylene-di-isocyanate.
i LU101631 According to a particular embodiment, the hardener is made of said mix.
The primer 7 is optional and is advantageously white.
The quantity of primer 7 used is between 10 and 100 g/m°, preferably between 30 and 50 g/m?, and more preferably between 35 and 40 g/m?.
5 The décor 9 comprises one or several UV inks. The used inks may comprise cyan, magenta, yellow and black inks, but advantageously no white ink. The quantity of inks used is in total between 1 and 30 g/m? preferably between 2 and 20 g/m? and more preferably between 5 and 15 g/m? The thickness of the primer 7 and the décor 9, taken altogether, is between 25 and 30 um.
If the primer layer 7 is absent, the décor 9 is directly printed on the coating 5.
The topcoat 11 is for example as described in WO 2017/067978.
A method for producing floor planks such as the floor plank 1 will now be described.
First the wood based substrate 2 is obtained. Ways to obtain such a substrate are known to the skilled person (for example described in WO 2018/077636) and will not be described.
Then the upper surface 13 of the substrate 2 is optionally sanded.
The upper layer 4 is embossed, brushed, or embossed and brushed. In a preferred embodiment, the surface 13 of the upper layer 4 is embossed with an embossing cylinder (not represented) or a short cycle press (not represented) equipped with an embossing plate.
The coating 5 is then applied on the upper surface 13, and cured using UV rays (not represented). Curing is performed in a manner known in itself. Preferably, the applied amount of dry film is between 10 and 50 g/m°.
Thanks to the coating, the junction 4C or the imperfections of the veneer will not be perceived one the plank 1 is finished.
The primer layer 7 is optionally applied on the upper surface 19. Preferably, the applied amount of dry film is between 10 and 60 g/m°. The primer layer 7 facilitates future application of the inks.
The décor 9 is then printed on the primer layer 7 or on the coating 5 in case there is no primer layer 7. This is advantageously carried out using a Drop-on-Demand inkjet system, for example using UV ink. Advantageously, only cyan, magenta, yellow or black inks are used, but no white ink. The printer can be a multipass or single pass printer.
The top coat 11 is finally applied on the décor 9. Preferably, the applied amount of top coat, once dry, is between 5 and 12 g/m°. The thickness of the top coat 11 is between 40 and 50 microns.
IN particular embodiments, the obtained panel is cut into smaller pieces forming the planks. Thanks to the above features, imperfections due to the junction between the pieces 4A, 4B of veneer or wooden lamellas, or due to a lower quality of the veneer or wooden lamellas are still masked by the coating 5, despite the embossing or the embossing and brushing. Thanks to the embossing, or the embossing and brushing, the visual aspect and the realism of the floor plank 1 is improved. Surprisingly, the embossing, or the embossing and brushing, improve(s) the aspect of the floor plank 1 without making the junction 4C between the pieces 4A, 4B more visible.
Hence the floor plank 1 provides the user with an impression of better quality at a very competitive cost. In addition, the obtained parquet looks very natural. It also allows a variety of design effects thanks to the combination of digital printing and embossing.
The obtained floor planks are cheaper compared to corresponding standard wood products, and have an equal durability, thanks to the top coat 11.
Environmental aspect of the obtained floor planks is also really positive, since about twice less veneer raw material or wooden lamellas is used in order to produce high quality planks with several pieces of veneer or wooden lamellas in each plank. Indeed, pieces of veneer or a wooden lamellas containing a defect and having to be discarded are much smaller. This explains why less raw material is used.
Example(s) As an example, the first layer of coating 15 may by a mixture of the UV SEALER 583 and the HARDENER 896 from AkzoNobel.
The primer 7 may be the UK1373-9001 from Sherwin-Williams.
The top coat 11 may be a lacquer from AkzoNobel, such as UV TOP COAT NATURA, UV TOP COAT PROTECO or UV TOP HIGH GLOSS. Protocole: Obtain the substrate 2, Emboss, or emboss and brush, the upper layer 4 with standard equipment usually used in the flooring industry, such as cylinders or an SC press plate, Apply the coating 5 with hardener and then cure the coating, Change of line for performing digital printing of the white primer 7 and then curing of the UV inks,
Go back to the first line and print the décor 9 using UV inks and then cure the UV inks, Apply the top coat 11 and then cure it.

Claims (12)

  1. CLAIMS 1- A method for the manufacture of a floor plank (1), comprising at least the following successive steps: - obtaining a substrate (2) comprising a core layer (3) and a wood based upper layer (4) formed with several pieces (4A, 4B) of veneer or wooden lamellas paving the core layer (3); - optionally sanding an upper surface (13) defined by the upper layer (4); - embossing, or embossing and brushing the optionally sanded upper surface (13) of the upper layer (4); - applying a coating (5) on the substrate (2), wherein the coating (5) contains a hardener, - optionally applying a primer layer (7) on an upper surface (19) of the coating (5); - digitally printing a décor (9) on the primer layer (7) or the coating (5); and - applying a top coat (11) on the décor (9).
  2. 2. The method according to claim 1, wherein the core layer (3) comprises a material chosen from the group consisting of HDF, MDF, soft wood ribs, cardboards, a thermoplastic materials, and composite materials.
  3. 3. The method according to any one of claims 1 or 2, wherein the hardener comprises an isocyanate.
  4. 4.- The method according to claim 3, wherein the hardener comprises a mix of hexane, 1,6-diisocyanato-homopolymer and hexamethylene-di-isocyanate.
  5. 5.- The method according to any one of claims 1 to 4, wherein the step of digitally printing includes a multipass digital printing.
  6. 6.- The method according to any one of claims 1 to 5, wherein the upper layer (4) has a thickness comprised between 0.5 and 4 mm.
  7. 7.- The method according to any one of claims 1 to 6, wherein the coating (5) has a specific weight comprised between 10 and 50 g/m°.
  8. 8.- The method according to any one of claims 1 to 7, wherein the coating (5) has | a thickness comprised between 5 and 10 um. ee
  9. 9.- The method according to any one of claims 1 to 8, wherein the primer layer (7) is white.
  10. 10.- The method according to any one of claims 1 to 9, wherein the step of digitally printing includes a multipass digital printing.
  11. 11.- The method according to any one of claims 1 to 10, wherein the step of digitally printing is carried out using UV ink or water-based ink.
  12. 12.- A floor plank (1) successively comprising: - a substrate (2) comprising a core layer (3), and a wood based upper layer (4) formed with several pieces of veneer (4A, 4B) paving the core layer (3), the upper layer (4) defining an upper surface (13) being optionally sanded and being embossed, brushed, or embossed and brushed; - a coating (5) located on the upper surface (13) of the upper layer (4) and containing a hardener, the coating defining an upper surface (19) optionally sanded; - optionally a primer layer (7) located on the upper surface (19) of the coating (5); - a décor (9) digitally printed on the primer layer (7) or on the coating (5); and - a top coat (11) located on the décor (9).
LU101631A 2020-02-04 2020-02-04 Method for the manufacture of a floor plank with a wooden based substrate LU101631B1 (en)

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LU101631A LU101631B1 (en) 2020-02-04 2020-02-04 Method for the manufacture of a floor plank with a wooden based substrate
PCT/EP2021/052496 WO2021156280A1 (en) 2020-02-04 2021-02-03 Method for the manufacture of a floor plank with a wood based substrate

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Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017067978A1 (en) 2015-10-19 2017-04-27 Tarkett Gdl S.A. Method for the manufacture of embossed and digitally printed substrates
WO2018077636A1 (en) 2016-10-31 2018-05-03 Tarkett Gdl S.A. Wooden flooring board with a connection system having a plywood lamella
EP3495051A1 (en) * 2017-12-11 2019-06-12 Tarkett GDL S.A. Method for the manufacture of a floor tile with a wood based substrate

Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2017067978A1 (en) 2015-10-19 2017-04-27 Tarkett Gdl S.A. Method for the manufacture of embossed and digitally printed substrates
WO2018077636A1 (en) 2016-10-31 2018-05-03 Tarkett Gdl S.A. Wooden flooring board with a connection system having a plywood lamella
EP3495051A1 (en) * 2017-12-11 2019-06-12 Tarkett GDL S.A. Method for the manufacture of a floor tile with a wood based substrate

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