SURFACE FINISH MANUFACTURING SYSTEM AND PROCESS

Abstract

This invention relates to a surface finish manufacturing system and process and more particularly, but not exclusively, to a contrast surface finish manufacturing system and process for producing boards with a wood texture finish. The surface finish manufacturing system comprises a top layer and a bottom layer where part of the top layer is removed to expose part of the bottom layer.

Claims

1. A surface finish manufacturing system comprising a top layer and a bottom layer where part of the top layer is removed to expose part of the bottom layer.

2. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer is planed.

3. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer is brushed off.

4. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer is sanded off.

5. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer is burned away.

6. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer is embossed.

7. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer and part of the bottom layer is planed.

8. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer and part of the bottom layer is brushed off.

9. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer and part of the bottom layer is sanded off.

10. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer and part of the bottom layer is burned away.

11. A surface finish manufacturing system as claimed in claim 1 in which part of the top layer and part of the bottom layer is embossed.

12. A surface finish manufacturing system as claimed in any one of claim 1 or 8 to 11 in which part of the bottom layer is uneven.

13. A surface finish manufacturing system as claimed in any one of the preceding claims in which part of the top layer is uneven

14. A surface finish manufacturing system as claimed in claim 12 in which the uneven bottom layer is embossed with a pattern.

15. A surface finish manufacturing system as claimed in claim 13 in which the uneven top layer is embossed with a pattern.

16. A surface finish manufacturing system as claimed in any one of claim 1, 8 to 12 or 14 in which the bottom layer is extruded to form an uneven profile.

17. A surface finish manufacturing system as claimed in any one of claim 1 to 11, 13 or 15 in which the top layer is extruded to form an uneven profile.

18. A surface finish manufacturing system as claimed in any one of claim 1 to 11, 13, 15 or 17 in which the top layer is manufactured from an opaque material.

19. A surface finish manufacturing system as claimed in any one of claim 1, 8 to 12, 14 or 16 in which the bottom layer is manufactured from an opaque material.

20. A surface finish manufacturing system as claimed in any one of claim 1 to 11, 13, 15 or 17 in which the top layer is UV resistant material.

21. A surface finish manufacturing system as claimed in any one of claim 1, 8 to 12, 14, 16 or 19 in which the bottom layer is UV resistant material.

22. A surface finish manufacturing system as claimed in any one of claim 1 to 11, 13, 15, 17 or 20 in which the top layer is a composite material.

23. A surface finish manufacturing system as claimed in any one of claim 1, 8 to 12, 14, 16 or 21 in which the bottom layer is a composite material.

24. A surface finish manufacturing system as claimed in any one of claim 1 to 11, 13, 15, 17 or 20 in which the top layer is an acrylic material.

25. A surface finish manufacturing system as claimed in any one of claim 1, 8 to 12, 14, 16 or 21 in which the bottom layer is an acrylic material.

26. A surface finish manufacturing system as claimed in any one of the preceding claims in which there is a contrast in colour between part of the top layer and part of the bottom layer when part of the top layer is removed.

27. A surface finish manufacturing system as claimed in claim 26 in which the contrast between part of the top layer and part of the bottom layer resembles year rings of a tree.

28. A surface finish manufacturing system as claimed in any one of the preceding claims in which the top layer and bottom layer form a deck board.

29. A surface finish manufacturing system as claimed in claim 28 in which the deck board includes a top layer and a bottom layer.

30. A surface finish manufacturing system as claimed in claim 28 in which the deck board includes a top layer, a bottom layer and a lower base layer.

31. A surface finish manufacturing system as claimed in claim 30 in which the base layer is wood.

32. A surface finish manufacturing system as claimed in claim 30 in which the base layer is synthetic material.

33. A surface finish manufacturing system as claimed in claim 30 in which the base layer is aluminium.

34. A surface finish manufacturing process comprising the steps of: Co-extruding a top layer and a bottom layer; and removing part of the top layer or part of the top layer and part of the bottom layer.

35. A surface finish manufacturing process as claimed in claim 34 in which a further step includes embossing part of the top layer.

36. A surface finish manufacturing process as claimed in claim 34 in which a further step includes embossing part of the top layer and part of the bottom layer.

37. A surface finish manufacturing process as claimed in claim 34 in which a further step includes co-extruding the top layer to have an uneven profile.

38. A surface finish manufacturing process as claimed in claim 34 in which a further step includes co-extruding the top layer and the bottom layer to have an uneven profile.

39. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer to be removed by planing.

40. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer to be removed by brushing.

41. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer to be removed by sanding.

42. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer to be removed by burning.

43. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer to be removed by embossing.

44. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer and part of the bottom layer to be removed by planing.

45. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer and part of the bottom layer to be removed by brushing.

46. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer and part of the bottom layer to be removed by sanding.

47. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer and part of the bottom layer to be removed by burning.

48. A surface finish manufacturing process as claimed in any one of claims 34 to 38 in which a further step includes part of the top layer and part of the bottom layer to be removed by embossing.

49. A surface finish manufacturing process as claimed in any one of claims 34 to 49 in which a further step includes a contrast in colour when part of the top layer is removed.

50. A surface finish manufacturing process as claimed in any one of claims 34 to 48 in which a further step includes a contrast in colour when part of the top layer and part of the bottom layer is removed.

51. A surface finish manufacturing process as claimed in any one of claims 34 to 48 in which a further step includes a contrast in material when part of the top layer is removed.

52. A surface finish manufacturing process as claimed in any one of claims 34 to 48 in which a further step includes a contrast in material when part of the top layer and part of the bottom layer is removed.

53. A surface finish manufacturing process as claimed in any one of claims 40 to 52 in which a further step includes the contrast defining an abrupt change from one colour to another.

54. A surface finish manufacturing process as claimed in any one of claims 40 to 52 in which a further step includes the contrast defining a gradual change from one colour to another.

55. A surface finish manufacturing process as claimed in any one of claims 40 to 52 in which a further step includes the contrast defining a combined colour when part of the bottom layer is visible through part of the top layer.

56. A surface finish manufacturing process as claimed in any one of claims 34 to 55 in which a further step includes exposing a pattern when part of the top layer is removed.

57. A surface finish manufacturing process as claimed in any one of claims 34 to 55 in which a further step includes exposing a pattern when part of the top layer and part of the bottom layer is removed.

58. A surface finish manufacturing system comprising a foamed base formed of a resin and having a block structure, and a hard skin layer integrally connected with the foamed base and covering at least one side thereof, the hard skin layer including a first exposed face formed of a first colour resin parallel to one side of the foamed base, and a second exposed face formed of a second colour resin; the second exposed face being at a smaller distance from the surface of the foamed substrate covered than the first exposed face; the first exposed surface is composed of a plurality of exposed units in the same plane, the second exposed surface is composed of a plurality of sunken units, and the exposed units and the sunken units are arranged in a staggered mode; the hard surface layer further comprises a connecting unit between the adjacent exposed units and the sunken units, wherein the connecting unit comprises a connecting substrate which is formed by first colour resin and is integrally connected with the first exposed surface and a connecting surface material which is covered on the connecting substrate and is formed by second colour resin and is integrally connected with the second exposed surface; and, the said hard surface layer also includes the base course that is formed by the first colour resin and is connected with the connection substrate integrally and covered by the said second exposed surface; the first colour resin is different in colour from the second colour resin.

59. A surface finish manufacturing system as claimed in claim 58 in which the foaming matrix of the floor is made of PVC foaming material, and the hard surface layer (2000) is made of ASA non-foaming material.

60. A surface finish manufacturing system as claimed in claim 58 in which the first exposed surface has a thickness of not less than 0.1 mm, and the second exposed surface has a thickness of not less than 0.05 mm.

61. A surface finish manufacturing as claimed in claim 58 in which the foamed base of the floor is fed from a main extruder, the first exposed surface formed by the first colour resin, the connecting substrate and the base layer are fed from one sub-extruder, and the second exposed surface formed by the second colour resin and the connecting surface material are fed from the other sub-extruder.

62. A surface finish manufacturing process comprising the steps of: adding raw materials and additives for forming a foaming matrix into a main extruder, melting and plasticizing the raw materials and the additives in the main extruder, feeding the raw materials and the additives into a main runner of a mould, extruding the raw materials and the additives from a die lip of the main runner, and feeding the raw materials and the additives into a foaming cavity of the mould for foaming to form the foaming matrix; adding raw materials and additives for forming first colour resin into a first auxiliary extruder, adding raw materials and additives for forming second colour resin into a second auxiliary extruder, respectively melting and plasticizing the materials in the first auxiliary extruder and the second auxiliary extruder, respectively entering a first auxiliary flow channel and a second auxiliary flow channel of a mould, respectively allowing the molten materials to flow out from a straight port of the first auxiliary flow channel and a straight port of the second auxiliary flow channel through transverse diffusion of the first auxiliary flow channel and the second auxiliary flow channel, allowing the molten materials to layer and coat a foaming matrix, and performing co-extrusion and extrusion from a die orifice of the mould to form a floor precursor structure; the floor precursor structure has a foamed substrate, a first skin layer and a second skin layer, the second skin layer being disposed between the first skin layer and the foamed substrate; cooling and forming the floor front body structure; subjecting the cooled and formed floor precursor structure to surface heating to soften at least the first surface layer; pressing a partial area of the first surface layer below the surface of the second surface layer by embossing processing of an embossing roller so that the first surface layer and the second surface layer jointly represent a pre-state of wood grains; a grinding process, wherein the first surface layer which is not pressed below the surface of the second surface layer is abraded, and the second surface layer is displayed at the corresponding part of the abraded area; so that the former state of the wood grain is transformed into the wood grain.

63. A surface finish manufacturing process in claim 62 in which a further step includes the temperature of the first skin layer to be controlled within 250° C. during surface heating.

64. A surface finish manufacturing process in claim 62 in which a further step includes heating by adopting a tunnel type drying oven during surface heating, controlling the temperature in the drying oven to be 150-250° C. and controlling the time to be 3-20 s.

65. A surface finish manufacturing process in claim 62 in which a further step includes the embossing roller to be a cold roller during the embossing treatment of the embossing roller.

66. A surface finish manufacturing process in claim 62 in which a further step includes polishing by using a sander.

Description

BRIEF DESCRIPTION OF THE DRAWINGS

[0049] Embodiments of the invention are described below by way of example only and with reference to the drawings in which:

[0050] FIG. 1 shows a sectional front view of a tree trunk and broken lines indicating how planks are cut from the tree trunk;

[0051] FIG. 2 shows a sectional front view of a tree trunk and broken lines showing an alternative for cutting planks from the tree trunk;

[0052] FIG. 3 shows a perspective view of a plank cut from a tree trunk;

[0053] FIG. 4 shows a perspective view of an extruder and an embossing roller embossing a deck board;

[0054] FIG. 5 shows an end view of a co-extruded deck board;

[0055] FIG. 6 shows a sectional end view of an embossed deck board;

[0056] FIG. 7 shows a sectional end view of an embossed deck board and a broken line indicating where part of top layer and part of the bottom layer are removed;

[0057] FIG. 8 shows a sectional end view of an embossed deck board with part of the top and bottom layers removed;

[0058] FIG. 9 shows a left side view of a sander for sanding part of a top layer and part of a bottom layer of the decking board of FIG. 6 off;

[0059] FIG. 10 shows a sectional end view of the decking board of FIGS. 6 and 9 where part of the top layer is sanded off;

[0060] FIG. 11 shows a left side view of a brush roller for brushing part of the top and bottom layers of the decking board of FIG. 6;

[0061] FIG. 12 shows a sectional end view of the deck board of FIG. 11 where part of the top and bottom layers are brushed off;

[0062] FIG. 13 shows a left side view of a planer for planning part of a top layer of the deck board of FIG. 6;

[0063] FIG. 14 shows a sectional end view of the deck board of FIG. 13 where part of the top and bottom layers are planed off;

[0064] FIG. 15 shows a front right view of a worker burning part of a top layer and part of a bottom layer of a deck board;

[0065] FIG. 16 shows a sectional end view of the deck board of FIG. 15 where part of the top and bottom layers are burned;

[0066] FIG. 17 is a schematic view of the structure of a floor precursor of the present invention;

[0067] FIG. 18 is a schematic view of a co-extruded floor of the present invention;

[0068] FIG. 19 is an enlarged view of a portion of FIG. 18;

[0069] FIG. 20 is a schematic structural view of the mould of the present invention;

[0070] FIG. 21 is a front view of the A plate of FIG. 20;

[0071] FIG. 21 is a front view of the B plate of 20; and

[0072] FIG. 22 is a front view of the C plate of FIG. 20.

DETAILED DESCRIPTION OF THE DRAWING

[0073] With reference to FIGS. 1 to 17, a surface finish manufacturing system is generally indicated by reference numeral 1.

[0074] In this example the article to which the surface finish manufacturing system and method relates is a deck board.

[0075] The deck board 7 is a co-extruded board and has a core 12, a bottom layer 3 and a top layer 2, as is shown in FIG. 5.

[0076] The core 12 is made from a lightweight composite plastics material. The composite material is extruded into a rectangular shape. Alternatively, the core may be a hollow aluminium extruded rectangular tube. It will be appreciated that the core can be made of any convenient material, for example, a foam board.

[0077] A bottom layer 3 is co-extruded onto a top surface of the core 12. The bottom layer 3 may be made from an acrylic, an opaque plastics material or a composites material. The bottom layer 3 is a UV resistant material. The bottom layer 3 is a first colour, for example, brown.

[0078] A top layer 2 is co-extruded onto a top surface of the bottom layer 3. The top layer 2 may be made from an acrylic, an opaque plastics material or a composites material. The top layer 2 is a UV resistant material. The top layer 3 is a second colour, for example, yellow.

[0079] After the decking board 7 is co-extruded, the board 7 is conveyed from an exit of the extruder to an embossing machine, as is shown in FIG. 4. The embossing machine has an embossing roller 22 and conveying rollers for conveying a board thereon. Any other means may be used to make to make the top and/or bottom layer uneven as shown in FIGS. 6 to 8, 10, 12, 14 and 16.

[0080] The embossing roller is located above conveying rollers. The embossing roller is spaced apart from the conveying rollers. The embossing roller has a pattern on an outer surface thereof that resembles a wood finish, as is shown in FIG. 3.

[0081] When the board is conveyed from the co-extruder to the embossing machine, the top layer 2 is at an operatively upper end of the board 7. The material of the board 7 is not yet set and is therefore still deformable. The board 7 moves between the conveying rollers and embossing roller 22 and the embossing roller 22 presses on the board to force the wood finish pattern into the top and bottom layers of the board. In this manner, the embossing forms uneven corrugations along the length of the top layer 2, bottom layer 3 and upper surface of the core 12. The uneven corrugations of the top layer 2, bottom layer 3 and upper surface of the core 12 correspond with each other in a sectional end view, as is shown in FIG. 6.

[0082] FIGS. 6 to 8 show removal of part of the top layer 3 and bottom layer 2 from the board 7. A flat top surface is formed, as shown in FIG. 8, that displays part of the top layer 2 and bottom layer 3. In other words, part of the top layer 3 and bottom layer 2 are visible.

[0083] A number of methods may be used to remove part of the top layer 2 or top layer 2 and bottom layer 3, including sanding, brushing, planing and/or burning.

[0084] The method of sanding is shown in FIG. 9. The sander 6 has a drum 9. Sanding paper 8 extends around an outer circumference of the drum 9. A grit size of the sanding paper is selected depending on the required roughness of the upper surface of the board 7. The drum rotates in a clockwise direction. The board 7 passes underneath the sander roller 6 to remove part of the top layer 2 and part of the bottom layer 3. As shown in FIG. 10, after parts of the top layer 2 and bottom layer 3 are removed, the board 7 displays part of the top layer 2 and part of the bottom layer 3. The layers shown may represent year growth rings 4 and 5 of a tree. The top surface of the board is rough from the sanding.

[0085] The method of brushing is shown in FIG. 11. The brush 10 has a drum 12. Bristles 11 extend around an outer circumference of the drum 12. The drum 12 rotates in a clockwise direction. The board 7 is placed on a rear side of the brush 10. The top layer 2 is directed towards the brush 10. The board 7 passes underneath the brush 10 so that the bristles remove parts of the top and bottom layers. As shown in FIG. 12, after parts of the top layer 2 and bottom layer 3 are removed, the board 7 displays part of the top layer 2 and part of the bottom layer 3. The layers shown may represent year growth rings 4 and 5 of a tree. The top surface of the board is rough and uneven from the bristles. The bristles may be made from different materials, may be of different stiffness or hardness and may also be of different lengths.

[0086] The planing method is shown in FIG. 13. The planer 13 has a drum 15. Blades 14 extend around an outer circumference of the drum 15. The drum 15 rotates in a clockwise direction. The board 7 passes underneath the planer 13 to remove parts of the top layer 2 and bottom layer 3. As shown in FIG. 14, after parts of the top layer 2 and bottom layer 3 are removed, the board 7 displays part of the top layer 2 and part of the bottom layer 3. The layers shown may represent year growth rings 4 and 5 of a tree. The top surface of the board is smooth as a result of the sharp blades.

[0087] The burning method is shown in FIG. 15. The board 7 is placed on a surface with the top layer 2 operatively upwards. A user 20 has a gas blowtorch 19 with a flame 18. The user moves the flame 18 along the length of the board 7. The flame 18 heats part of the top layer 2. The top layer 2 melts and becomes thinner on some areas or may be burned away. Part of the bottom layer 3 may also be melted or burned away. In the areas where the top layer 2 may be thinner, the flame 18 heats the bottom layer to a larger extend. Molten material of the top layer 2 gathers up in valleys of the corrugations. In the areas where the top layer was either melted away, burned away or became thinner, the bottom layer 3 is more clearly visible as opposed to areas where the molten material gathered. As shown in FIG. 16, after parts of the top layer 2 and bottom layer 3 are heated, the board 7 displays part of the top layer 2 and part of the bottom layer 3. The layers shown may represent year growth rings 4 and 5 of a tree. The top surface of the board is uneven but smooth.

[0088] In all the above methods, the bottom layer 3 may become visible through thin parts of the top layer 2 when not all of the top layer 2 is removed. In the case of the planer, an abrupt change of colour i.e. of the two layers becomes visible over most of the board 7. In the case of the other methods explained above, both abrupt colour changes or gradual colour changes can be achieved.

[0089] An alternative embodiment is shown in FIGS. 17 to 23. As shown in FIG. 18, a wood-grained foamed floor includes a foamed base 1000 and a hard surface layer 2000. The hard surface layer 2000 has a three-dimensional concave-convex structure, and a convex surface is a first exposed surface 2001, and a concave surface is a second exposed surface 2002. The first exposed surface 2001 is formed of a first colour resin and is substantially parallel to one surface of the foam base 1000. And a second exposed surface 2002 formed of a second colour resin. The first colour resin and the second colour resin form a certain colour difference.

[0090] The first exposed surface 2001 is composed of a plurality of exposed units substantially in the same plane, and the second exposed surface 2002 is composed of a plurality of depressed units. The plurality of exposed units and the plurality of sinking units are arranged in a staggered mode.

[0091] As shown in FIG. 19, there is a connecting unit between adjacent exposed units and sunken units, which is a part of the hard surface layer 2000. The connection unit includes a connection base 2010 and a connection surface 2020 that are integrally connected. The connection substrate 2010 is formed of a first colour resin and is integrally connected with the first exposed surface; the connection surface material 2020 is formed of a second colour resin and covers the connection base material 2010.

[0092] The hard surface layer 2000 further includes a base layer 2003, and the base layer 2003 is formed of a first colour resin, integrally connected to a connection substrate 2010, and covered with a second exposed surface 2002.

[0093] In the wood-grain foamed floor of the present embodiment, the material of the foamed substrate 1000 is PVC micro-foam, and the material of the hard surface layer 2000 is ASA. The first exposed face 2001 has a thickness of 0.2 mm and the second exposed face 2002 has a thickness of 0.08 mm. The density was 0.72 g/cm3 The surface hardness was 72 in Rockwell hardness.

[0094] The manufacturing method of the wood texture foaming floor comprises the following steps:

[0095] a. uniformly mixing raw materials and additives for forming the foaming matrix 1000 through a high-speed mixer, adding the raw materials and the additives into a main extruder, melting and plasticizing the raw materials and the additives in the main extruder, feeding the raw materials and the additives into a main runner of a mould, extruding the raw materials and the additives from a die lip of the main runner, and feeding the raw materials and the additives into a foaming cavity of the mould for foaming to form the foaming matrix 1000;

[0096] b. uniformly mixing raw materials and additives thereof for forming first colour resin, raw materials and additives thereof for forming second colour resin, respectively adding the raw materials and additives thereof into a first auxiliary extruder and a second auxiliary extruder after being uniformly mixed by a high-speed mixer, respectively, melting and plasticizing the materials in the first auxiliary extruder and the second auxiliary extruder, respectively entering a first surface layer runner and a second surface layer runner of a mold, respectively, allowing the molten materials to respectively flow out from a straight port of the first surface layer runner and a straight port of the second surface layer runner through transverse diffusion of the first surface layer runner and the second surface layer runner, respectively entering a first surface layer casting cavity and a second surface layer casting cavity, allowing the molten materials to layer-coat a foaming matrix 1000, co-extruding and extruding the foaming matrix from a die orifice of the mold, performing hollow cooling setting in a setting die after extrusion, and forming a floor precursor structure after the setting die; as shown in FIG. 17, the pre-flooring structure has a foam layer 1000, a first skin layer 2001 ‘and a second skin layer 2002’;

[0097] c. the floor front body structure is formed by water cooling;

[0098] d. heating the surface of the floor precursor structure after water cooling forming to soften the first surface layer 2001 ‘and the second surface layer 2002’; specifically, the first surface layer 2001′ is heated to about 90° C. to be softened by a tunnel type heating oven with the oven temperature controlled at 200° C. for 10 s, and is suitable for being imprinted with textures;

[0099] e. pressing a partial area of the first skin layer 2001 ‘below the surface of the second skin layer 2002’ by embossing processing by an embossing roller so that the first skin layer 2001 ‘and the second skin layer 2002’ collectively exhibit a pre-state of wood grain;

[0100] f. polishing to make the first surface layer 2001′ not pressed under the surface of the second surface layer 2002′ worn, and to make the second surface layer 2002′ appear on the corresponding part of the worn area; so that the pre-state of the wood grain is transformed into the wood grain.

[0101] In the above-described embodiments, the raw materials and additives for forming the foamed base 1000 and the raw materials and additives for forming the hard surface layer 2000 are conventional, and therefore, they will not be described in detail.

[0102] As shown in FIG. 20, a mould for manufacturing the foamed floor includes a main runner module 3, a second skin module 2 and a first skin module 1, which are composed of eight a-H runner plates.

[0103] The D-H plate is provided with a main runner 300 of a mould core layer, and the main runner is used for moulding a core layer foaming layer of the wood texture-imitated foaming co-extrusion floor.

[0104] Referring to FIG. 23, the plate C is provided with a material inlet 201 of the second surface layer module and a material outlet 202 of the second surface layer feeding plate, in addition to the main runner 300 of the mould core layer. The two ports are communicated through a flow passage.

[0105] Referring to FIG. 22, the B plate is provided with a material inlet 203 and a second surface layer runner 200 of the second surface layer forming plate, in addition to a main runner 300 of the mould core layer, and a second surface layer casting cavity 20 is formed between the second surface layer runner 200 and the main runner 300. Flow baffles 4 are further arranged at the end parts of the two sides of the second surface layer casting cavity 20. The second surface layer runner 200 is communicated with the second surface layer casting cavity 20 through a straight line; by such arrangement, the melt of the second surface layer can be coated on the core layer plate in a half-coating manner to form the first intermediate body.

[0106] The plate C is also the second surface layer feeding plate 21, and the plate B is also the second surface layer forming plate 22; the material outlet 202 of the second surface layer feeding plate is connected with the material inlet 203 of the second surface layer forming plate; the second skin tape casting cavity 20 is arranged on the second skin forming plate 22, and the material feeding port 201 of the second skin module is arranged at the side of the whole die.

[0107] The B and C plates together constitute a second skin module 2.

[0108] Referring to FIG. 21, the plate a is provided with a material inlet 101 and a first surface layer runner 100 of the first surface layer module, in addition to a main runner 300 of the mould core, and a first surface layer casting cavity 10 is formed between the first surface layer runner 100 and the main runner 300. Flow baffles 4 are arranged at the end parts of the two sides of the first surface layer casting cavity 10. The first surface layer runner 100 is communicated with the first surface layer casting cavity 10 through a straight line; by the arrangement, the melt of the first surface layer is coated on the first intermediate body in a half-coating mode, and a precursor structure of the foaming floor with wood grains is formed.

[0109] In this embodiment the first skin module 1 consists solely of one flow field plate, i.e. the a-plate. The material inlet 101 and the die outlet 5 of the first skin module are both arranged on the plate, while the material inlet 101 of the first skin module is arranged on the upper part of the die.

[0110] In order to prevent the first skin layer and the second skin layer from being discoloured, the distance between the discharge port of the first skin layer casting cavity 10 and the discharge port of the second skin layer casting cavity 20 in the die plate discharge direction is not less than 0.1 mm.

[0111] The precursor structure of the foamed floor with wood texture is subjected to subsequent treatment, so that the foamed floor with wood texture can be obtained. The post-processing is realized based on two surface layers. The floor based on the two surface layers can be respectively processed by using different colours for the two surface layers, for example, the surface layers are embossed, and the surface layers are partially removed after embossing so that the surface of the floor has two layers, and the floor is expressed from the angles of solid (embossing depth), colour difference, light and shade and the like, thereby realizing the vivid effect of the texture.

[0112] It is envisaged that the invention described herein will be convenient to use to achieve different finishes on products such as cladding boards, floorboards, deck boards and the like. The invention specifically facilitates creating an enhanced wood-grain finish on such products resulting in a more natural appearance. The invention allows for more control over the colours of the board, including the pattern that the colours form. The control includes the ability to create an abrupt change from one colour to another, a gradual change from one colour to another or a combination of colours of different layers depending on how much the colour of a bottom layer is visible through a top layer i.e. how much of a top layer is removed so that the colour of the bottom layer influences the combined colour visible from above. The layers can completely envelope a board, in other words, cover all or part of the surfaces of a board and need not only cover an upper surface of a board.

[0113] It will be appreciated by those skilled in the art that the invention is not limited to the precise detail herein described. For example, instead of having a bottom layer co-extruded over the core, the core can be the bottom layer. The top layer will the be co-extruded over the core. There may also be more than three layers, for example, five layers. The invention herein described may be used to create any pattern or abstract design on a surface by way of a contrast in colours, for example, the pattern embossed in the layers may be a logo in. The top layer is then removed to display the logo. The layers may also be injection moulded.