Three-layer frame solid wood floor with balanced force relieving groove and production process thereof

Abstract

The present invention belongs to the technical field of building decoration materials and relates to a three-layer framed solid wood floor with a balanced force-relieving groove. It consists of a surface layer, a framed core board layer, and a back board from top to bottom. The frame of the framed core board layer and the intermediate partition strips are formed into a "Lv" shape by pine wood strips, and several pine wood blocks are filled therein. Among them, the pine wood strips are quarter-sawn wood strips; the pine wood blocks are formed by gluing two pine wood squares with different tangential directions in the length direction. A balance groove is provided at the center edge of the length direction of each pine wood block, penetrating the core board layer; the long saw grooves on the surfaces of two adjacent pine wood blocks filled along the length direction of the framed core board layer are perpendicular to each other; unloading grooves are provided at a distance of 1 / 5 from the edge of the two long sides of the pine wood strips in the width direction of the framed core board layer, penetrating the core board layer. The present invention also discloses the production process. By utilizing the different mechanical properties of wood in different grain directions, the internal stress balance within the frame structure is achieved, the tensile force of the core board is reduced, and deformation and cracking in the floor heating environment are reduced.

Description

Technical Field

[0001] This invention belongs to the field of building decoration materials technology, and relates to flooring, and more particularly to a three-layer frame solid wood floor with a balanced stress relief groove and its manufacturing process. Background Technology

[0002] Current frame flooring mainly uses whole core boards stacked together. The stability of the frame structure is achieved by adjusting the arrangement of different layers. However, this does not contribute to material conservation or overall structural stability. It does not achieve structural stability through the mutual constraints between mechanical elements, making it unworthy of mass production in industrial applications.

[0003] CN205116649U discloses a three-layer solid wood composite frame flooring. The product structure includes a core board, which is made of three layers of frame boards bonded together. The three layers of frame boards are staggered and form tenons and grooves on both sides of the core board. The three layers of frame boards include a main board and side boards bonded to both sides of the main board. A top board is provided on the top of the core board and a bottom board is provided on the bottom of the core board. This can realize the effective use of scrap materials, protect precious tree species, and is low-carbon and environmentally friendly.

[0004] The announcement number CNCN206016148U discloses a frame-type solid wood composite flooring, which includes a thick core six-sided frame structure composed of a thick core board one, a thick core board two, a thick core board three, and a thick core bottom board; a solid wood surface board is attached to the thick core six-sided frame structure. The frame-type solid wood composite flooring adopts a thick core six-sided frame structure, which reduces the number of flooring layers and has the same crisscross mesh structure as multi-layer solid wood composite flooring, which significantly reduces the amount of glue used, reduces production steps, and reduces labor costs.

[0005] However, in the above-mentioned frame flooring, due to changes in the physical and chemical properties of the materials during long-term use, the core layer structure cannot remain stable throughout the entire service life. Summary of the Invention

[0006] To overcome the shortcomings of the prior art, the present invention provides a three-layer frame solid wood floor with a balanced stress relief groove. By adjusting the floor structure, the mutual force constraint between the layers of wood is increased, thereby improving the stability of the three-layer solid wood floor.

[0007] Technical solution

[0008] A three-layer framed solid wood floor with balanced unloading grooves, which consists of a surface layer, a framed core board layer and a back board from top to bottom. The frame of the framed core board layer and the middle partition strips are surrounded by pine wood strips in a "Lv" shape, and several pine wood blocks are filled therein. Among them, the pine wood strips are quarter-sawn wood strips; the pine wood blocks are glued in the length direction by two pine wood squares with different tangential directions. At the center edge of the length direction of each pine wood block, a balance groove is provided, with a width of 0.8-1.0 mm and a length of 2 cm, penetrating the core board layer; the long saw grooves on the surfaces of two adjacent pine wood blocks filled along the length direction of the framed core board layer are perpendicular to each other; on the two long sides of the pine wood strips in the width direction of the framed core board layer, unloading grooves are provided at a distance of 1 / 5 from the edge, with a width of 1.0-2.0 mm and a length of 1 cm, penetrating the core board layer.

[0009] In a preferred disclosed example of the present invention, long and short saw grooves are arranged alternately on the surface of the pine wood block parallel or perpendicular to the length direction. Among them, the length of the short saw groove is 1 / 3 of the width of the pine wood block, the groove width is 1-3 mm, preferably 2 mm; the length of the long saw groove is 5 / 9 of the width of the pine wood block, the groove width is 1-3 mm, preferably 2 mm; the distance between two adjacent saw grooves is 4-12 mm, preferably 8 mm, and the opposite two saw grooves are on the same line. <000.org / 00027>

[0010] In a preferred disclosed example of the present invention, the surface layer is natural wood veneer, with a thickness of 0.6-4.0 mm, preferably 3.0 mm, and the material is oak, black walnut, white ash, teak, maple, etc.

[0011] In a preferred disclosed example of the present invention, the width of the pine wood strip is not less than 2 cm to ensure the strength of the entire framed core board.

[0012] In a preferred disclosed example of the present invention, the back board is solid wood veneer, with a thickness of 1.2-2.5 mm, preferably 2.0 mm, and the material is birch, poplar, fir, etc.

[0013] Furthermore, the surface layer, the framed core board layer and the back board are pressed together with an adhesive to form an integral body.

[0014] The second object of the present invention is to also provide a production process for the above three-layer framed solid wood floor with balanced unloading grooves, including the following steps:

[0015] A: Select a rotary-cut solid wood whole thick veneer with a certain thickness for moisture content balance to make the moisture content reach 6-8%;

[0016] B: Manufacture of pine wood blocks: Two pine wood squares with different tangential directions are glued in the length direction to form pine wood blocks, with an adhesive application amount of 180-200 g / ㎡, cold pressing, pressure 10-11 kg / cm

[0015] , <OO00031>,

[0016] , time 45-90 min;

[0017] C: Grooving: Grooving is done along the length of the pine block using multiple sets of saw blades of different sizes. The depth of the large grooving is 5 / 9 of the width of the pine block, and the depth of the small grooving is 3 / 9 of the width of the pine block. The grooving width is 1-2mm, forming long and short grooves.

[0018] D: Cutting: Cut the grooved pine blocks into squares according to the actual size requirements;

[0019] E: Pine strip preparation: Dry pine wood with a moisture content of 7-8% is sawn along the radial grain to make strips with a thickness of 9.8-10.3 mm and a width of not less than 2 cm.

[0020] F: Assembly: Assemble the chopped pine blocks and strips into a block shape, with the pine blocks arranged in a 1:1 horizontal and 1:1 vertical pattern. Apply glue to the pine strips at a rate of 190–210 g / m², with a pressure of 6–8 kg / cm². 2 ;

[0021] G: Preparation of balancing groove: Cut a balancing groove at 1 / 2 of the length of each pine block. The balancing groove runs through the entire thickness of the core board, is 2cm long, and is 0.8-1.0mm wide, with the center point at 1 / 2 of the pine block.

[0022] H: Preparation of stress relief grooves: Stress relief grooves are made on both sides of the long strips of pine wood cut in the width of the frame core board, 1 / 5 away from the edge. The grooves are 2mm wide, 1cm long, and penetrate the entire core board.

[0023] I: Sanding: Use 180-grit sandpaper to polish both sides of the frame core board, with the thickness tolerance controlled within ±0.1mm;

[0024] J: Back panel preparation: The back panel is a solid wood veneer with a thickness of 1.2-2.5mm;

[0025] K: Hot pressing: Applying water-based polyurethane formaldehyde-free adhesive to the surface layer, frame core board, and back panel and hot pressing at low temperature.

[0026] Temperature 80℃, pressure 9~10kg / cm 2 Time: 300 seconds;

[0027] L: Health preservation, dissection, sanding, painting, packaging.

[0028] Beneficial effects

[0029] The three-layer frame solid wood flooring with a balancing stress relief groove disclosed in this invention uses core boards made from small pieces of scrap wood, which can reduce production costs. At the same time, it utilizes the different mechanical properties produced by different grain directions of wood to achieve stress balance within the frame structure, reducing the tensile force exerted by the core board on the surface and back panels, reducing cracking, and reducing the risk of deformation and cracking in underfloor heating environments. Attached Figure Description

[0030] Figure 1 .Three-layer framed solid wood floor with balanced unloading grooves; three-dimensional structure schematic diagram

[0031] Figure 2 .Schematic diagram of the structure of the frame core board layer

[0032] Figure 3 .Schematic diagram of 2 pine blocks arranged in different radial directions, with long and short saw grooves and balance grooves on the surface

[0033] Among them, the labels in the figure are respectively 1, surface layer; 2, frame core board layer; 3, back board; 4, pine wood strip; 5, pine block; 6, balance groove; 7, unloading groove; 8, short saw groove; 9, long saw groove Detailed implementation manners

[0034] The present invention will be described in detail below in conjunction with embodiments, so that those skilled in the art can better understand the present invention, but the present invention is not limited to the following embodiments

[0035] Embodiment 1

[0036] A three-layer framed solid wood floor with balanced unloading grooves, which consists of a surface layer 1, a frame core board layer 2 and a back board 3 from top to bottom. The frame and the middle partition strips of the frame core board layer 2 are surrounded by pine wood strips 4 in a "Lv" shape, and several pine blocks 5 are filled therein. Among them, the pine wood strips 4 are quarter-sawn wood strips; the pine blocks 5 are formed by gluing two pine wood squares with different tangential directions in the length direction. A balance groove 6 is provided at the center edge of the length direction of each pine block 5, with a width of 0.8 - 1.0 mm and a length of 2 cm, penetrating through the core board layer; the long saw grooves 9 on the surfaces of two adjacent pine blocks 5 filled along the length direction of the frame core board layer 2 are perpendicular to each other; unloading grooves 7 are provided at a distance of 1 / 5 from the edge of the two long sides of the pine wood strips 4 in the width direction of the frame core board layer 2, with a width of 1.0 - 2.0 mm and a length of 1 cm, penetrating through the core board layer

[0037] Embodiment 2

[0038] A three-layer framed solid wood floor with balanced unloading grooves, which consists of a surface layer 1, a frame core board layer 2 and a back board 3 from top to bottom. The frame and the middle partition strips of the frame core board layer 2 are formed into a "Lv" shape by pine wood strips 4, and several pine wood blocks 5 are filled therein. Among them, the pine wood strips 4 are quarter-sawn wood strips; the pine wood blocks 5 are glued in the length direction by two pine wood squares with different tangential directions. At the central edge of each pine wood block 5 in the length direction, there is a balance groove 6 with a width of 0.8 - 1.0 mm and a length of 2 cm, penetrating the core board layer; the long saw grooves 9 on the surfaces of two adjacent pine wood blocks 5 filled along the length direction of the frame core board layer 2 are perpendicular to each other; on the surface of the pine wood block 5, long and short saw grooves are arranged alternately parallel or perpendicular to the length direction. Among them, the length of the short saw groove 8 is 1 / 3 of the width of the pine wood block 5, and the groove width is 1 - 2 mm; the length of the long saw groove 9 is 5 / 9 of the width of the pine wood block 5, and the groove width is 2 mm; the spacing between two adjacent saw grooves is 8 mm, and the opposite two saw grooves are on the same line; on the two long sides of the pine wood strip 4 in the width direction of the frame core board layer 2, unloading grooves 7 are provided at a distance of 1 / 5 from the edge, with a width of 1.0 - 2.0 mm and a length of 1 cm, penetrating the core board layer.

[0039] Example 3

[0040] A three-layer framed solid wood floor with balanced unloading grooves, which consists of a surface layer 1, a frame core board layer 2 and a back board 3 from top to bottom. The frame and the middle partition strips of the frame core board layer 2 are formed into a "Lv" shape by pine wood strips 4, and several pine wood blocks 5 are filled therein. Among them, the surface layer 1 is natural wood veneer with a thickness of 3.0 mm, and the materials are oak, black walnut, white ash, teak, maple, etc.; the pine wood strips 4 are quarter-sawn wood strips; the pine wood blocks 5 are glued in the length direction by two pine wood squares with different tangential directions. At the central edge of each pine wood block 5 in the length direction, there is a balance groove 6 with a width of 0.8 - 1.0 mm and a length of 2 cm, penetrating the core board layer; the long saw grooves 9 on the surfaces of two adjacent pine wood blocks 5 filled along the length direction of the frame core board layer 2 are perpendicular to each other; on the surface of the pine wood block 5, long and short saw grooves are arranged alternately parallel or perpendicular to the length direction. Among them, the length of the short saw groove 8 is 1 / 3 of the width of the pine wood block​​​​​A manufacturing process for a three-layer frame solid wood floor with a balancing stress-relief groove includes the following steps:

[0043] A: Select a whole piece of rotary-dried solid wood veneer of a certain thickness and balance its moisture content to achieve a moisture content of 6-8%.

[0044] B: Pine block production: Two pine blocks with different tangential directions are glued together along their length to form a pine block. The glue application rate is 180-200 g / m², followed by cold pressing at a pressure of 10-11 kg / cm². 2 Time: 45–90 minutes;

[0045] C: Grooving: Grooving is done along the length of the pine block using multiple sets of saw blades of different sizes. The depth of the large grooving is 5 / 9 of the width of the pine block, and the depth of the small grooving is 3 / 9 of the width of the pine block. The grooving width is 1-2mm, forming long and short grooves.

[0046] D: Cutting: Cut the grooved pine blocks into squares according to the actual size requirements;

[0047] E: Pine strip preparation: Dry pine wood with a moisture content of 7-8% is sawn along the radial grain to make strips with a thickness of 9.8-10.3 mm and a width of not less than 2 cm.

[0048] F: Assembly: Assemble the chopped pine blocks and strips into a block shape, with the pine blocks arranged in a 1:1 horizontal and 1:1 vertical pattern. Apply glue to the pine strips at a rate of 190–210 g / m², with a pressure of 6–8 kg / cm². 2 ;

[0049] G: Preparation of balancing groove: Cut a balancing groove at 1 / 2 of the length of each pine block. The balancing groove runs through the entire thickness of the core board, is 2cm long, and is 0.8-1.0mm wide, with the center point at 1 / 2 of the pine block.

[0050] H: Preparation of stress relief grooves: Stress relief grooves are made on both sides of the long strips of pine wood cut in the width of the frame core board, 1 / 5 away from the edge. The grooves are 2mm wide, 1cm long, and penetrate the entire core board.

[0051] I: Sanding: Use 180-grit sandpaper to polish both sides of the frame core board, with the thickness tolerance controlled within ±0.1mm;

[0052] J: Back panel preparation: The back panel is a solid wood veneer with a thickness of 1.2-2.5mm;

[0053] K: Hot pressing: Applying water-based polyurethane formaldehyde-free adhesive to the surface layer, frame core board, and back panel and hot pressing at low temperature.

[0054] Temperature 80℃, pressure 9~10kg / cm 2 Time: 300 seconds;

[0055] L: Health preservation, dissection, sanding, painting, packaging.

[0056] The above description is merely an embodiment of the present invention and does not limit the patent scope of the present invention. Any equivalent structural or procedural transformations made using the present invention specification, or direct or indirect applications in other related technical fields, are similarly included within the patent protection scope of the present invention.

Claims

1. A three-layer framed solid wood floor with a balanced unloading groove, which consists of a surface layer (1), a framed core board layer (2) and a back board (3) from top to bottom. The frame and the middle partition strips of the framed core board layer (2) are surrounded by pine strips (4) in a "Lv" shape, and several pine blocks (5) are filled therein. It is characterized in that: The pine strip (4) is a radially cut strip; the pine block (5) is made by gluing two pine squares with different tangential directions together in the length direction. A balancing groove (6) with a width of 0.8 to 1.0 mm and a length of 2 cm is provided at the central edge of each pine block (5) in the length direction, penetrating the core board layer; the long saw grooves (9) on the surface of two adjacent pine blocks (5) filled along the length direction of the frame core board layer (2) are perpendicular to each other; the frame core board layer (2) has a stress relief groove (7) with a width of 1.0 to 2.0 mm and a length of 1 cm at 1 / 5 of the distance from the edge on the two long sides of the pine strip (4) in the width direction, penetrating the core board layer.

2. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 1, characterized in that: The surface of the pine block (5) is provided with alternating long and short saw grooves parallel or perpendicular to the length direction. The length of the short saw groove (8) is 1 / 3 of the width of the pine block (5) and the groove width is 1 to 3 mm. The length of the long saw groove (9) is 5 / 9 of the width of the pine block (5) and the groove width is 1 to 3 mm. The distance between two adjacent saw grooves is 4 to 12 mm, and the two opposite saw grooves are on the same line.

3. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 2, characterized in that: The width of the short saw groove (8) is 2mm.

4. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 2, characterized in that: The width of the long saw groove (9) is 2mm.

5. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 2, characterized in that: The distance between two adjacent saw grooves is 8mm.

6. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 1, characterized in that: The surface layer (1) is a natural wood veneer with a thickness of 0.6 to 4.0 mm, preferably 3.0 mm, and the material is oak, black walnut, ash, teak or maple.

7. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 1, characterized in that: The width of the pine strip (4) is not less than 2cm to ensure the strength of the entire frame core board.

8. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 1, characterized in that: The back panel (3) is a solid wood veneer with a thickness of 1.2 to 2.5 mm, preferably 2.0 mm, and is made of birch, poplar or fir.

9. The three-layer frame solid wood flooring with a balancing stress-relief groove according to claim 1, characterized in that: The surface layer (1), the frame core board layer (2), and the back plate (3) are bonded together with adhesive.

10. A manufacturing process for a three-layer frame solid wood floor with a balancing stress-relief groove as described in any one of claims 1-9, characterized in that, Includes the following steps: A: Select a whole piece of rotary-dried solid wood veneer of a certain thickness and balance its moisture content to achieve a moisture content of 6-8%. B: Pine block production: Two pine blocks with different tangential directions are glued together along their length to form a pine block. The glue application rate is 180-200 g / m², followed by cold pressing at a pressure of 10-11 kg / cm². 2 Time: 45–90 minutes; C: Grooving: Grooving is done along the length of the pine block using multiple sets of saw blades of different sizes. The depth of the large grooving is 5 / 9 of the width of the pine block, and the depth of the small grooving is 3 / 9 of the width of the pine block. The grooving width is 1-2mm, forming long and short grooves. D: Cutting: Cut the grooved pine blocks into squares according to the actual size requirements; E: Pine strip preparation: Dry pine wood with a moisture content of 7-8% is sawn along the radial grain to make strips with a thickness of 9.8-10.3 mm and a width of not less than 2 cm. F: Assembly: Assemble the chopped pine blocks and strips into a block shape, with the pine blocks arranged in a 1:1 horizontal and 1:1 vertical pattern. Apply glue to the pine strips at a rate of 190–210 g / m², with a pressure of 6–8 kg / cm². 2 ; G: Preparation of balancing groove: Cut a balancing groove at 1 / 2 of the length of each pine block. The balancing groove runs through the entire thickness of the core board, is 2cm long, and is 0.8-1.0mm wide, with the center point at 1 / 2 of the pine block. H: Preparation of stress relief grooves: Stress relief grooves are made on both sides of the long strips of pine wood cut in the width of the frame core board, 1 / 5 away from the edge. The grooves are 2mm wide, 1cm long, and penetrate the entire core board. I: Sanding: Use 180-grit sandpaper to polish both sides of the frame core board, with the thickness tolerance controlled within ±0.1mm; J: Back panel preparation: The back panel is a solid wood veneer with a thickness of 1.2-2.5mm; K: Hot pressing: Apply water-based polyurethane formaldehyde-free adhesive to the surface layer, frame core board, and back panel, and hot press at a low temperature of 80℃ and a pressure of 9-10 kg / cm². 2 Time: 300 seconds; L: Health preservation, dissection, sanding, painting, packaging.

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