Production process of surface-core same-material three-layer solid wood composite floor

Abstract

The invention belongs to the technical field of composite floor processing and production, and particularly relates to a production process of a surface-core-same-material three-layer solid wood composite floor, which comprises the following specific preparation steps: step 1, wood floor leftover materials and inferior boards in the board processing process are collected; the water content of wood floor leftover materials and secondary boards is detected, if the water content is large, the wood floor leftover materials and the secondary boards need to be dried, and the high-performance and environment-friendly three-layer solid wood composite floor with the same surface material and the same core material is manufactured by effectively utilizing the recycled solid wood floor leftover materials through a cold pressing technology and a formaldehyde-free adhesive; compared with a traditional solid wood composite floor, the prepared three-layer solid wood composite floor with the same surface material and the same core material is not prone to deformation and high in stability, wood can be reasonably utilized, the utilization rate of leftover materials is increased, meanwhile, cold pressing and formaldehyde-free technologies are used, and the three-layer solid wood composite floor is green, environmentally friendly and free of formaldehyde release.

Description

Technical Field

[0001] The invention relates to the technical field of composite floor processing and production, in particular to a production process of a three-layer solid wood composite floor made of the same material as the core and the surface. Background Art

[0002] With the progress of industry and the gradual improvement of people's living standards, people's taste for living environment and decoration is also constantly improving. Wood flooring is becoming more and more popular in people's lives and work. Now the more common ones are solid wood flooring and engineered wood flooring. Solid wood flooring is more used for high-end decoration due to its high price, while engineered wood flooring is more used for daily decoration. However, the composite flooring produced by the current production and processing technology of solid wood composite flooring is easy to deform during use, has poor stability, and is easily affected by temperature and environment. In addition, the current composite flooring often directly uses solid wood veneer, and cannot effectively recycle the scraps in the board processing process, resulting in waste of scraps in the board processing process. The pressing process cannot adopt environmentally friendly methods and is prone to release a large amount of formaldehyde, which is not safe during later use.

[0003] Therefore, a production process of a three-layer solid wood composite floor with the same material for the surface and core is proposed to solve the above-mentioned problems. Summary of the invention

[0004] The purpose of the present invention is to provide a production process of a three-layer solid wood composite floor with the same surface and core materials, so as to solve the problems raised in the above background technology.

[0005] To achieve the above-mentioned purpose, the present invention provides the following technical solution: a production process of a three-layer solid wood composite floor with the same core and surface material, and the specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step 3: Select the wood square made in the above step as the core board of the composite floor, select the edge banding board made in the above step as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.15-0.2 kg / m, set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press, control the pressure range of the cold press to 8-20Pa, and control the pressing time to 5-24 hours to obtain a blank core board, and during the cold pressing process, a pad needs to be placed between every 3-5 blank boards; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the surface board and bottom board of the same model and size as the core board, and apply glue again on the upper and lower surfaces of the core board manually. The amount of glue applied is controlled at 0.3-0.4 kg / m2, and the surface board and bottom board are assembled with the upper and lower surfaces of the core board to ensure that the edges are aligned. After the assembly is completed, place them inside the cold press, control the pressure of the cold press to 8-20 kg, and control the pressing time to 1-5 hours. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the surface and core.

[0006] Preferably, in step 1, the specifications of the small wooden board are 7-30 cm in length, 10-20 cm in width, and 1-2 cm in thickness, and the specifications of the small wooden strips are 10-50 cm in length, 3-10 cm in width, and 1-2 cm in thickness.

[0007] Preferably, in step 2, the specifications of the wooden squares are 100-240 cm in length, 7-30 cm in width, and 10-20 cm in thickness, and the specifications of the edge banding boards are 100-240 cm in length, 10-20 cm in width, and 0.1-0.3 cm in thickness.

[0008] Preferably, the gluing method in step three is to apply glue only at the two ends of the wood square for bonding with the edge banding board, while no glue is applied between the small wooden boards in the wood square.

[0009] Preferably, the sawing machine in step 4 is a frame saw machine, and its processing thickness is 0.2-1.5 cm.

[0010] Preferably, the curing conditions in step 4 are a temperature of 22-25°C, a humidity of 55-65%, and a time of 8-24 hours, and the core plate structure is an I-shaped structure with specifications of 100-240cm in length, 7-30cm in width, and 1-3cm in thickness.

[0011] Preferably, the core board, the surface board and the bottom board are made of the same type of wood.

[0012] Preferably, the adhesive applied in step three and step five is a formaldehyde-free adhesive, and the formaldehyde-free adhesive is one of acrylic formaldehyde-free adhesive, polyurethane formaldehyde-free adhesive, epoxy resin formaldehyde-free adhesive, isocyanate adhesive, cellulose formaldehyde-free adhesive and silicone formaldehyde-free adhesive.

[0013] Compared with the prior art, the present invention has the following beneficial effects: The present invention effectively utilizes recycled solid wood floor scraps and uses cold pressing technology and formaldehyde-free adhesive to prepare a high-performance, green and environmentally friendly three-layer solid wood composite floor with the same core and surface as the same material. Compared with traditional solid wood composite floors, the three-layer solid wood composite floor with the same core and surface as the same material prepared by the present invention is not easy to deform, has high stability, can reasonably utilize wood, and improves the utilization rate of scraps. At the same time, cold pressing and formaldehyde-free technology are used, which is green and environmentally friendly and does not release formaldehyde. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 This is a flow chart of the production process steps; Figure 2 Schematic diagram of the structure of the composite floor.

[0015] In the picture: 1 small wooden strip; 2 small wooden boards. DETAILED DESCRIPTION

[0016] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0017] In the description of the present invention, it is necessary to understand that the terms "upper", "lower", "front", "back", "left", "right", "top", "bottom", "inside", "outside", etc., indicating the orientation or position relationship are based on the orientation or position relationship shown in the drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0018] See also Figure 1-2, the present invention provides a technical solution: A production process of a three-layer solid wood composite floor with the same core and surface material, the specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; When selecting wooden floor scraps and inferior boards, it is necessary to exclude unqualified wood such as cracked and worm-hole-containing wood. Before drying the boards, the wooden floor scraps and inferior boards need to be soaked in a 15-35% mass percentage concentration aqueous solution of phosphorus-based flame retardants and boron-based flame retardants for 2-4 hours. After soaking, they should be placed at 60-150℃ to dry until the moisture content is less than 10%.

[0019] Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step three: select the wood made in the above steps as the core board of the composite floor, select the edge banding board made in the above steps as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.15-0.2 kg / m. The amount of glue applied can also be adjusted according to the size of the cross-section of the board to avoid waste caused by excessive glue application. Set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press. Control the pressure range of the cold press to 8-20Pa, and the pressing time to 5-24 hours to obtain a blank core board. During the cold pressing process, a pad needs to be placed between every 3-5 blank boards to ensure uniform force, thereby avoiding damage to the blank board; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the surface board and bottom board of the same model and size as the core board, and apply glue again on the upper and lower surfaces of the core board manually. The amount of glue applied is controlled at 0.3-0.4 kg / m2, and the surface board and bottom board are assembled with the upper and lower surfaces of the core board to ensure that the edges are aligned. After the assembly is completed, place them inside the cold press, control the pressure of the cold press to 8-20 kg, and control the pressing time to 1-5 hours. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the surface and core.

[0020] In the step 1, the specifications of the small wooden board are 7-30 cm in length, 10-20 cm in width, and 1-2 cm in thickness, and the specifications of the small wooden strips are 10-50 cm in length, 3-10 cm in width, and 1-2 cm in thickness.

[0021] In the step 2, the specifications of the wooden square are 100-240cm in length, 7-30cm in width, and 10-20cm in thickness, and the specifications of the edge banding board are 100-240cm in length, 10-20cm in width, and 0.1-0.3cm in thickness.

[0022] The gluing method in step three is to only apply glue to the two ends of the wood square for bonding with the edge banding board, while no glue is applied between the small wooden boards in the wood square.

[0023] The sawing machine in step 4 is a frame saw machine, and its processing thickness is 0.2-1.5cm.

[0024] The curing conditions in step 4 are a temperature of 22-25° C., a humidity of 55-65%, and a time of 8-24 hours. The core plate structure is an I-shaped structure with specifications of 100-240 cm in length, 7-30 cm in width, and 1-3 cm in thickness.

[0025] The core board, the surface board and the bottom board are made of the same kind of wood.

[0026] The adhesive applied in step three and step five is a formaldehyde-free adhesive, and the formaldehyde-free adhesive is one of acrylic formaldehyde-free adhesive, polyurethane formaldehyde-free adhesive, epoxy resin formaldehyde-free adhesive, isocyanate adhesive, cellulose formaldehyde-free adhesive and silicone formaldehyde-free adhesive.

[0027] The following core issues need to be paid attention to in the later use of solid wood composite flooring: keep the floor dry, avoid scratches, clean and wax regularly.

[0028] First of all, it is very important to keep the floor dry. The solid wood composite floor is very sensitive to moisture and is easily deformed or expanded due to moisture penetration. Therefore, when cleaning the floor, you should use a wrung soft cloth or mop, and avoid using a wet mop. Pay special attention to prevent rain from soaking the floor, and avoid overflow from balconies and toilets. If there is water on the floor, wipe it dry in time, avoid direct sunlight and air conditioning to prevent the floor from drying out or shrinking; Secondly, avoiding scratches is an important measure to protect the floor surface. The surface of solid wood composite floor is relatively soft and easy to scratch. Avoid sharp objects and heavy objects from directly contacting the floor. When moving furniture, lift it up and move it gently. You can stick soft pads on the legs of furniture to reduce friction. Avoid heavy objects falling or sharp objects scratching the floor; In addition, regular cleaning and waxing can extend the life of the floor and maintain its gloss. It is recommended to use a soft brush or vacuum cleaner to clean the dust and sand on the floor surface regularly, and avoid using a wet rag to clean. Wax the floor at regular intervals (such as every quarter). Before waxing, clean the floor, then evenly apply floor wax, and wipe it with a soft cloth until it is smooth and shiny. 12; Finally, controlling indoor humidity is also the key to maintaining the floor. Solid wood composite flooring is very sensitive to humidity changes. Too dry or too wet will cause the floor to deform or crack. It is recommended to use a humidifier or dehumidifier to keep the indoor humidity within a suitable range (40%-60%), especially in dry or humid seasons.

[0029] Embodiment 1: The specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step 3: Select the wood made in the above steps as the core board of the composite floor, select the edge banding board made in the above steps as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.15 kg / m, set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press, control the pressure range of the cold press to 8Pa, and control the pressing time to 5 hours to obtain a blank core board, and during the cold pressing process, a pad needs to be placed between every 3 blank boards; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the top plate and bottom plate of the same model and size as the core plate, apply glue again on the upper and lower surfaces of the core plate manually, and control the amount of glue applied to 0.3 kg / m2, and assemble the top plate and bottom plate with the upper and lower surfaces of the core plate to ensure that the edges are aligned. After the assembly, place them inside the cold press, control the pressure of the cold press to 8 kg, and control the pressing time to 1 hour. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the top and core. Embodiment 2: The specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step 3: Select the wood made in the above steps as the core board of the composite floor, select the edge banding board made in the above steps as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.175 kg / m, set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press, control the pressure range of the cold press to 14Pa, and control the pressing time to 14.5 hours to obtain a blank core board, and during the cold pressing process, a pad needs to be placed between every 4 blank boards; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the top plate and bottom plate of the same size as the core plate, apply glue again on the upper and lower surfaces of the core plate manually, and control the amount of glue applied to 0.35 kg / m2, and assemble the top plate and bottom plate with the upper and lower surfaces of the core plate to ensure that the edges are aligned. After the assembly, place them inside the cold press, control the pressure of the cold press to 14 kg, and control the pressing time to 3 hours. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the top and core. Embodiment 3: The specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step 3: Select the wood square made in the above step as the core board of the composite floor, select the edge banding board made in the above step as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.2 kg / m, set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press, control the pressure range of the cold press to 20Pa, and control the pressing time to 24 hours to obtain a blank core board, and during the cold pressing process, a pad needs to be placed between every 5 blank boards; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the surface panels and bottom panels of the same model and size as the core panels, and manually apply glue on the upper and lower surfaces of the core panels again. The amount of glue applied is controlled at 0.4 kg / m2, and the surface panels and bottom panels are assembled with the upper and lower surfaces of the core panels to ensure that the edges are aligned. After the assembly is completed, place them inside the cold press, control the pressure of the cold press to 20 kg, and control the pressing time to 5 hours. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the surface and core.

[0030] The above shows and describes the basic principles and main features of the present invention and the advantages of the present invention. For those skilled in the art, it is obvious that the present invention is not limited to the details of the above exemplary embodiments, and the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention; therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive. The scope of the present invention is limited by the attached claims rather than the above description. Therefore, it is intended to include all changes within the meaning and scope of the equivalent elements of the claims in the present invention, and any figure marks in the claims should not be regarded as limiting the claims involved.

[0031] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A production process for a three-layer solid wood composite floor with the same core and surface material, characterized in that: The specific preparation steps of the production process of the three-layer solid wood composite floor with the same core and surface material are as follows: Step 1: Collect the scraps and inferior boards of wooden floor during the board processing process, and test the moisture content of the scraps and inferior boards. If the moisture content is high, they need to be dried to ensure that the moisture content is controlled within 10%. Use the scraps and inferior boards of wooden floor to make small wooden boards and small wooden strips of certain specifications; Step 2: Use the small wooden boards made in step 1 to arrange them closely vertically into wooden squares, and then vertically splice the small wooden strips to make edge-banding boards; Step 3: Select the wood square made in the above step as the core board of the composite floor, select the edge banding board made in the above step as the edge of the composite floor, apply glue on the side wall of the core board, and ensure that the glue is evenly applied, and ensure that the amount of glue applied on the side wall of the core board is 0.15-0.2 kg / m, set the edge banding layer at the upper and lower ends of the core board, ensure that the edge banding layer is aligned with the edge of the core board, and then place it in a cold press, control the pressure range of the cold press to 8-20Pa, and control the pressing time to 5-24 hours to obtain a blank core board, and during the cold pressing process, a pad needs to be placed between every 3-5 blank boards; Step 4: After the cold pressing of the blank board is completed, the blank board is transferred and transported to the warehouse for curing. After the curing is completed, the blank board is sawed and cut according to the size of the model required for use. According to the different tree species of the board, the boards with texture and color defects of the blank are classified and stacked, and the defects on the blank are fed back. The blank core board after sorting is sanded to a certain thickness. During sanding, the surface layer is sanded 8-12 wires, the bottom of the board is sanded 20-30 wires, and the sanding belt model is selected to be 80-120 yards for the bottom and 100-150 yards for the surface to obtain the core board; Step 5: Select the surface board and bottom board of the same model and size as the core board, and apply glue again on the upper and lower surfaces of the core board manually. The amount of glue applied is controlled at 0.3-0.4 kg / m2, and the surface board and bottom board are assembled with the upper and lower surfaces of the core board to ensure that the edges are aligned. After the assembly is completed, place them inside the cold press, control the pressure of the cold press to 8-20 kg, and control the pressing time to 1-5 hours. After pressing, remove dust from the surface to obtain a three-layer solid wood composite floor with the same material as the surface and core.

2. The production process of a three-layer solid wood composite floor with the same core and surface material as claim 1, characterized in that: In the step 1, the specifications of the small wooden board are 7-30 cm in length, 10-20 cm in width, and 1-2 cm in thickness, and the specifications of the small wooden strips are 10-50 cm in length, 3-10 cm in width, and 1-2 cm in thickness.

3. The production process of a three-layer solid wood composite floor with the same core and surface material as claimed in claim 1, characterized in that: In the step 2, the specifications of the wooden square are 100-240cm in length, 7-30cm in width, and 10-20cm in thickness, and the specifications of the edge banding board are 100-240cm in length, 10-20cm in width, and 0.1-0.3cm in thickness.

4. The production process of a three-layer solid wood composite floor with the same surface and core as claimed in claim 1, characterized in that: The gluing method in step three is to only apply glue to the two ends of the wood square for bonding with the edge banding board, while no glue is applied between the small wooden boards in the wood square.

5. The production process of a three-layer solid wood composite floor with the same surface and core as claimed in claim 1, characterized in that: The sawing machine in step 4 is a frame saw machine, and its processing thickness is 0.2-1.5cm.

6. The production process of a three-layer solid wood composite floor with the same surface and core as claimed in claim 1, characterized in that: The curing conditions in step 4 are a temperature of 22-25° C., a humidity of 55-65%, and a time of 8-24 hours. The core plate structure is an I-shaped structure with specifications of 100-240 cm in length, 7-30 cm in width, and 1-3 cm in thickness.

7. The production process of a three-layer solid wood composite floor with the same core and surface material as claimed in claim 1, characterized in that: The core board, the surface board and the bottom board are made of the same kind of wood.

8. The production process of a three-layer solid wood composite floor with the same core and surface material as claimed in claim 1, characterized in that: The adhesive applied in step three and step five is a formaldehyde-free adhesive, and the formaldehyde-free adhesive is one of acrylic formaldehyde-free adhesive, polyurethane formaldehyde-free adhesive, epoxy resin formaldehyde-free adhesive, isocyanate adhesive, cellulose formaldehyde-free adhesive and silicone formaldehyde-free adhesive.

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