Board, method for manufacturing a board and a panel comprising such board material
A board including a plurality of layers having a different composition. At least one of the layers is based on MgO and MgChloride and/or at least one of said layers is based on MgO and MgSulphate. Methods for manufacturing such boards, and methods for manufacturing coated panels include such board.
1 . A board, wherein this board is a board comprising
5Mg(OH2)·MgSO4·7H2O;
wherein the board is based on magnesiumoxysulphate (MOS) based on MgO and MgSulphate;
wherein the board is in a dried condition and retains residual humidity with a residual moisture content of 7 wt. % or below, and a residual moisture of more than 4 wt. % through a thickness of the board comprising MOS.
2 . The board of claim 1 , wherein the board is made comprising the steps of providing a mixture of at least MgO with MgSulphate; and the step of adding citric acid and/or alkali resistant binders and/or separate fibers.
3 . The board of claim 1 , wherein the board comprises plant fibers.
4 . The board of claim 3 , wherein the plant fibers comprise one or more from wood fibers, bamboo fibers and straw fibers.
5 . The board of claim 3 , wherein the board comprises at most 90% by weight or at most 80% by weight of plant fibers.
6 . The board of claim 3 , wherein the board comprises more than 15 wt. % of plant fibers.
7 . The board of claim 1 , wherein the board comprises active carbon.
8 . The board of claim 1 , wherein the board is impregnated with a binder and/or coated with a binder.
9 . The board of claim 8 , wherein the binder is one of the following: latex, acrylic, polyurethane, polyvinylalchohol (PVA), ethylene vinylacetate (EVA), PVAc dispersion, acrylic styrene emulsion, silicate glue, solvent based one component or two component resin, silane or siloxanes.
10 . A board, wherein this board comprises a plurality of layers having a different composition,
wherein this board is a board comprising 5Mg(OH2)·MgSO4·7H2O,
wherein at least one of said layers is based on MgO and MgSulphate,
wherein said board comprises at least three layers,
wherein a centrally located layer has a different composition compared to at least one of the more outwardly located layers,
wherein the board is in a dried condition and retains residual humidity with a residual moisture content of 7 wt. % or below, and a residual moisture of more than 4 wt. %, through a thickness of the one of said layers based on MOS and MgSulphate.
11 . The board of claim 10 , wherein at least one of said layers comprises 15% or more cellulose based material, while another one of said layers comprises less cellulose based material.
12 . The board of claim 10 , wherein at least one of said layers comprises a ratio ash/cellulose content from 1/1 to 4/1, while another one of said layers comprises a ratio ash/cellulose content that is higher.
13 . The board of claim 10 , wherein the board is symmetric through its thickness.
14 . The board of claim 10 , wherein the layers have a different composition resulting in a different color as expressed by a difference in Luminance value and/or Saturation value of at least 10.
15 . The board of claim 10 , wherein said layers have a different composition resulting in a different density.
16 . A floor, wall or ceiling panel comprising the board of claim 10 , and a provided thereon decorative top layer.
17 . The floor, wall or ceiling panel of claim 16 , wherein the board is provided at at least two opposite edges with coupling means allowing to couple two such panels at the respective edges,
wherein a vertical locking in a direction V 1 perpendicular to the plane of coupled panels and/or a horizontal locking in a direction H 1 perpendicular to the respective edges and in the plane of the coupled panels 1 is obtained;
wherein said coupling means are basically shaped as a tongue and a groove,
wherein the groove is bordered by an upper lip and a lower lip;
wherein said lower lip and/or said upper lip comprises a locking element taking part in said horizontal locking,
wherein the respective lip is at least partially provided in a layer of the board that comprises cellulose fibers.
18 . A panel according to claim 17 , wherein said board comprises at least three layers, namely a centrally located layer and two more outwardly situated layers at each side of the central layer,
wherein the more outwardly situated layers comprises a higher cellulose content than the central layer, and
wherein the respective lip is provided at least partially, and potentially essentially or wholly in the outwardly situated layer situated at the bottom of said central layer, respectively situated at the top of said central layer.