Synchronous grain matching composite door and manufacturing method thereof

Abstract

The invention belongs to the technical field of home decoration, and relates to a synchronous grain matching composite door which comprises a door frame, door leaves are installed in the door frame, the door leaves are connected through hinges arranged on the inner side of the door frame in the vertical direction to form a composite door body, and the door frame comprises a door frame panel and a door frame base material. The door leaf comprises a door leaf first panel, a door leaf second panel, a door leaf frame and a filling core material; the door leaf first panel and the door leaf second panel are arranged on the front face and the back face of the composite door body respectively, and the end face of one side of the door leaf is rotationally connected with the end face of one side in the door frame through hinges. Synchronous grain-matching impregnated paper is attached to the surfaces of the door leaf first panel, the door leaf second panel and the door frame panel, and wood grains on the surfaces of the synchronous grain-matching impregnated paper synchronously emerge on the surfaces of the door leaf and the door frame after being subjected to hot pressing. The invention further discloses a manufacturing method of the composite door. According to the composite door, the appearance attractiveness is improved, the touch experience effect is good, the use performance is safe and reliable, and the manufacturing method is simple.

Description

Technical Field

[0001] The invention belongs to the technical field of home decoration, relates to doors, and in particular to a synchronous pattern composite door and a manufacturing method thereof. Background Art

[0002] According to the material composition, wooden doors can be divided into three categories: solid wood doors, composite doors and molded wooden doors. Among them, solid wood doors use natural wood as the core material of the door leaf, and the wood used to make solid wood doors mainly uses precious wood, such as cherry wood, walnut wood, teak, etc., which is relatively expensive; composite doors use solid wood strips, artificial boards or honeycomb paper and other internal filling materials as the door core, integrated wood as the frame, and the surface material is veneered density board or decorative veneer; molded wooden doors are made of two pieces of high-density fiber molded door panels with shapes and simulated wood grains, which are mechanically pressed. At present, in the wooden door market, composite doors have become the type of wooden door with the largest market share due to their excellent performance, natural wood texture comparable to solid wood doors, beautiful and diverse styles, and moderate price cost.

[0003] Different types of wooden doors have different internal structures and production processes, and their surface decorations are also different. The surface decoration of wooden doors can be mainly divided into painting, surface decoration and mechanical processing. Among them, painting decoration generally has the disadvantages of high cost and easy damage to the paint surface; veneer decoration generally has the disadvantage of no three-dimensional effect of the texture; mechanical processing has the disadvantages of difficult production and high labor costs.

[0004] Synchronous grain pressing technology refers to the technology of using high-definition camera system and precise positioning equipment to synchronize the grain on the printed wood grain paper with the grain on the steel template. Synchronous grain means that the pattern on the template matches the pattern on the impregnated paper. The template is pressed on the impregnated paper to form grooves with uneven shapes, imitating the visual effect of solid wood. Jiang Zhenfan pointed out in the article "Characteristics of Melamine Board and Its Application in Home" (Modern Decoration (Theory) 2011 Issue 10) that synchronous grain pressing technology can effectively make the appearance of the product obtain the effect of simulating the wood grain of real solid wood, and its cost is greatly reduced compared with solid wood doors or products using solid wood panels. Patent CN111037673A discloses a method for making a single-sided synchronous grain decorative sheet that is non-deformable, non-transparent, and anti-cracking; Patent CN202899539U discloses a synchronous grain laminate floor. Summary of the invention

[0005] In view of the deficiencies in the above-mentioned prior art, the purpose of the present invention is to provide a synchronous-grain composite door, that is, a decorative panel is made of synchronous-grain pressing technology, and then the synchronous-grain decorative panel is used to synthesize a composite door, so as to realize the in-depth application of synchronous-grain in the field of wooden doors, so as to overcome the shortcomings of surface decorative materials used in the production process of existing composite doors, such as easy scratches on the paint surface, lack of three-dimensional effect of the texture and high cost of solid wood decoration.

[0006] A synchronous counter-grain composite door comprises a door frame, a door leaf is installed inside the door frame, and the door leaf is connected to the composite door body by hinges arranged in the vertical direction on the inner side of the door frame, wherein the door frame comprises a door frame panel and a door frame base material, and the door leaf comprises a first door leaf panel, a second door leaf panel, a door leaf frame and a filling core material; the first door leaf panel and the second door leaf panel are respectively arranged on the front and back sides of the composite door body, and one side end face of the door leaf is rotatably connected to the one side end face inside the door frame by a hinge; the surfaces of the first door leaf panel, the second door leaf panel and the door frame panel are affixed with synchronous counter-grain impregnated paper, and the wood grain texture on the surface of the synchronous counter-grain impregnated paper is synchronously emerged on the surfaces of the door leaf and the door frame after hot pressing.

[0007] Furthermore, it also includes a first door frame, which is arranged on the front end face of the door frame, and a second door frame is arranged on the rear end face of the door frame, wherein a door frame stop strip is arranged on the surface between the first door frame and the second door frame; further, at least two door frame stop strips are installed.

[0008] Furthermore, the surface texture color of the first door frame, the second door frame and the door frame stop strip is the same as that of the composite door body.

[0009] Furthermore, the door frame panel is attached to the surface of a door frame substrate, and the door frame substrate is formed by cold-pressing and bonding a high-density fiberboard or a medium-density fiberboard to a plywood, preferably a medium-density fiberboard to a plywood.

[0010] Furthermore, the door leaf frame is formed by splicing laminated veneer lumber (LVL).

[0011] Furthermore, the filling core material is arranged inside the door leaf frame, and is single board laminated timber, bridge hole mechanical plate, honeycomb paper or honeycomb aluminum sheet, preferably honeycomb paper.

[0012] The present invention also discloses a method for manufacturing the synchronous pattern composite door, which comprises the following steps: A. Customizing a synchronous embossed steel plate according to the color and pattern of the wood grain texture of the specific decorative texture melamine decorative impregnated film paper, so that the surface of the synchronous embossed steel plate has the same raised wood grain texture, i.e., relief effect, and the grain mark; sanding the substrate used for preparing the door leaf and door frame and the decorative paper; B. Fix the synchronous embossed steel plate on the upper heat conducting plate of the press, with the side of the steel plate with the wood grain texture and the grain matching mark facing downward; place the pad, the above-mentioned substrate and the decorative paper in order from bottom to top on the lower heat conducting plate of the press, adjust the positions of the pad and the decorative paper until the texture of the decorative paper completely overlaps with the texture of the steel plate, then start the press to make the upper heat conducting plate descend and close and apply pressure for hot pressing, so that the decorative paper is pressed on the surface of the substrate to form a synchronous grain matching impregnated paper panel; C. Cut the synchronous grain impregnated paper panels into sizes that match the door leaf frame, apply polyvinyl acetate composite adhesive evenly on the non-textured surfaces of the two panels, place them on both sides of the main door frame, and use a cold press to cold-press them into synchronous grain composite door leaves; D. Cut the synchronous grain impregnated paper panel into a size that matches the door frame substrate, apply polyvinyl acetate composite glue evenly on the non-textured surface of the panel, place it on the non-fiberboard side of the door frame substrate, use a cold press to cold-press it into a synchronous grain composite door frame, and use a slotting machine to slot one side of the panel, apply polyvinyl acetate composite glue in the slot, install the door frame stopper, and nail it on the side without the decorative panel to make the door frame stopper tightly combined with the door frame substrate; E. The first door frame, the second door frame and the door frame stopper, which have the same color as the composite door texture, are spliced ​​together with the door leaf and the door frame through hinges to form a synchronous composite door.

[0013] In the preferred disclosed example of the present invention, the substrate in step A is a medium density fiberboard with a size conventional in the industry, for example 2450×1230×4.75 mm.

[0014] In the preferred disclosed examples of the present invention, the process parameters of the hot pressing in step B are 15-20 MPa, 150-220° C., and time 8-15 s, preferably pressure 18 MPa, temperature 180° C., and time 10 s.

[0015] In the preferred disclosed example of the present invention, in step C, the door leaf of the synchronously matched composite door is cold pressed by a cold press, and the first door leaf panel, the door leaf frame (including filling core material) and the second door leaf panel are placed in sequence from bottom to top on the lower pressing plate of the cold press, and the cold pressing process parameters are set to 2-12 MPa, time 4-6 h, preferably 5.0 MPa, time 5 h, and then the press is started to make the upper pressing plate descend, close and pressurize to form a door leaf blank, which is then cut and edge-sealed to form the door leaf of the synchronously matched composite door.

[0016] In a preferred disclosed example of the present invention, in step C, the door leaf frame is spliced ​​by laminated veneer lumber (LVL) with a thickness of 15 to 50 mm, preferably 30 mm, and the interior is filled with honeycomb paper as a core material.

[0017] In the preferred disclosed example of the present invention, in step D, a door frame of a composite door with synchronous matching patterns is formed by cold pressing with a cold press, and a door frame substrate and a door frame panel are placed on the lower pressing plate of the cold press in sequence from bottom to top, and the cold pressing process parameters are set to a pressure of 15 to 20 MPa and a time of 4 to 8 hours, preferably 18.0 MPa and a time of 6 hours. The press is started to allow the upper pressing plate to descend, close and pressurize to form a door frame blank, which is then formed through cutting and edge sealing processes to form a door frame of a composite door with synchronous matching patterns.

[0018] Furthermore, the door frame substrate is formed by cold-pressing and gluing two 4.75 mm thick medium-density fiberboards and 15 mm thick plywood on both sides.

[0019] In the preferred disclosed example of the present invention, the first door frame, the second door frame and the door frame stop strip described in step E, which have the same texture color as the composite door, are made of melamine-impregnated decorative paper or PVC veneer, which has the same texture color as the composite door. Beneficial Effects

[0020] (1) The appearance is greatly improved. The present invention uses synchronous grain matching technology to form a three-dimensional wood relief texture similar to natural wood veneer on the surface of the door leaf. The relief texture is consistent with the decorative paper texture, and the template surface is uneven. Different from the monotonous appearance of traditional printed veneers, it presents a unique visual effect. The appearance is far superior to PVC and melamine veneer decoration and even paint finishing, greatly improving the appearance of composite door products.

[0021] (2) Excellent tactile experience. The present invention enables the texture with three-dimensional effect to have an elastic modulus suitable for human function, and has good resilience and pressure resistance. When touching or pressing the door leaf during use, the three-dimensional wood grain on the surface will shrink and store energy or rebound, which has a better touch and excellent experience compared to other decorative wooden doors.

[0022] (3) Safe and reliable performance. The three-dimensional texture formed by the present invention can effectively reduce the impact of external forces on the door panel, so that the wooden door can achieve the aesthetic effect of paint-coated surface decoration while having strong wear resistance and corrosion resistance. Compared with the easy scratching characteristics of paint-coated decoration, the door panel of the synchronous grain composite door has better durability, which expands the application range and use environment of the composite door. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 . 3D schematic diagram of synchronous composite door; Figure 2 . Figure 1 A-A sectional view; Figure 3 . Schematic diagram of the structure of the synchronously-grained composite door frame.

[0024] Markings in the figure: 1-door frame, 2-first door frame, 3-first panel of door leaf, 4-second panel of door leaf, 5-door leaf, 6-door leaf frame, 7-door frame stop strip, 8-second door frame, 9-door frame panel, 10-door frame substrate. DETAILED DESCRIPTION

[0025] In order to make the purpose and advantages of the present invention more concise and clear, the present invention will be illustrated by the following specific examples, but the present invention is by no means limited to these examples. The following examples are only preferred embodiments of the present invention and are only used to illustrate the present invention and cannot be understood as limiting the scope of the present invention. It should be pointed out that any modifications, equivalent substitutions and improvements made within the essence and principles of the present invention should be included in the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention should be based on the attached claims. Example 1

[0026] A synchronous counter-grain composite door comprises a door frame 1, a door leaf 5 is installed inside the door frame 1, and the door leaf 5 is connected by hinges arranged on the inner side of the door frame 1 in the vertical direction to form a composite door body, wherein the door frame 1 comprises a door frame panel 9 and a door frame base material 10, and the door leaf 5 comprises a first door panel 3, a second door panel 4, a door frame 6 and a filling core material; the first door panel 3 and the second door panel 4 are respectively arranged on the front and back sides of the composite door body, and one side end face of the door leaf 5 is rotatably connected to one side end face inside the door frame 1 through a hinge; the surfaces of the first door panel 3, the second door panel 4 and the door frame panel 9 are affixed with synchronous counter-grain impregnated paper, and the wood grain texture on the surface of the synchronous counter-grain impregnated paper is synchronously emerged on the surfaces of the door leaf and the door frame after hot pressing. Example 2

[0027] A synchronous counter-grain composite door comprises a door frame 1, a door leaf 5 is installed inside the door frame 1, and the door leaf 5 is connected by hinges arranged on the inner side of the door frame 1 in the vertical direction to form a composite door body, wherein the door frame 1 comprises a door frame panel 9 and a door frame base material 10, and the door leaf 5 comprises a first door panel 3, a second door panel 4, a door frame 6 and a filling core material; the first door panel 3 and the second door panel 4 are respectively arranged on the front and back sides of the composite door body, and one side end face of the door leaf 5 is rotatably connected to one side end face inside the door frame 1 through a hinge; the surfaces of the first door panel 3, the second door panel 4 and the door frame panel 9 are affixed with synchronous counter-grain impregnated paper, and the wood grain texture on the surface of the synchronous counter-grain impregnated paper is synchronously emerged on the surfaces of the door leaf and the door frame after hot pressing. It also includes a first door frame 2, which is arranged on the front end face of the door frame 1, and a second door frame 8 is arranged on the rear end face of the door frame 1, wherein a door frame stop strip 7 is arranged on the surface between the first door frame 2 and the second door frame 8; at least two door frame stop strips 7 are installed. Example 3

[0028] A synchronous counter-grain composite door comprises a door frame 1, a door leaf 5 is installed inside the door frame 1, and the door leaf 5 is connected by hinges arranged on the inner side of the door frame 1 in the vertical direction to form a composite door body, wherein the door frame 1 comprises a door frame panel 9 and a door frame base material 10, and the door leaf 5 comprises a first door panel 3, a second door panel 4, a door frame 6 and a filling core material; the first door panel 3 and the second door panel 4 are respectively arranged on the front and back sides of the composite door body, and one side end face of the door leaf 5 is rotatably connected to one side end face inside the door frame 1 through a hinge; the surfaces of the first door panel 3, the second door panel 4 and the door frame panel 9 are affixed with synchronous counter-grain impregnated paper, and the wood grain texture on the surface of the synchronous counter-grain impregnated paper is synchronously emerged on the surfaces of the door leaf and the door frame after hot pressing. The door frame 1 further comprises a first door frame 2, which is arranged on the front end face of the door frame 1, and a second door frame 8 is arranged on the rear end face of the door frame 1, wherein a door frame stopper 7 is arranged on the surface between the first door frame 2 and the second door frame 8; at least two door frame stoppers 7 are installed. The surface texture and color of the first door frame 2, the second door frame 8 and the door frame stopper 7 are the same as that of the composite door body. Example 4

[0029] A synchronous grain composite door comprises a door frame 1, a door leaf 5 is installed inside the door frame 1, and the door leaf 5 is connected to form a composite door body through a hinge arranged in the vertical direction inside the door frame 1, wherein the door frame 1 comprises a door frame panel 9 and a door frame substrate 10, and the door leaf 5 comprises a first door leaf panel 3, a second door leaf panel 4, a door leaf frame 6 and a filling core material; the first door leaf panel 3 and the second door leaf panel 4 are respectively arranged on the front and back sides of the composite door body, and one end face of the door leaf 5 is rotatably connected to one end face inside the door frame 1 through a hinge; the first door leaf panel 3, the second door leaf panel 4 and the door frame panel 9 are pasted with synchronous grain impregnated paper, and the wood grain texture on the surface of the synchronous grain impregnated paper is synchronously emerged on the surface of the door leaf and the door frame after hot pressing. The door frame panel 9 is pasted on the surface of the door frame substrate 10, and the door frame substrate 10 is formed by cold-pressing and bonding high-density fiberboard or medium-density fiberboard with plywood. The door frame 1 further comprises a first door frame 2, which is arranged on the front end face of the door frame 1, and a second door frame 8 is arranged on the rear end face of the door frame 1, wherein a door frame stopper 7 is arranged on the surface between the first door frame 2 and the second door frame 8; at least two door frame stoppers 7 are installed. The surface texture and color of the first door frame 2, the second door frame 8 and the door frame stopper 7 are the same as that of the composite door body. Example 5

[0030] A synchronous grain composite door comprises a door frame 1, a door leaf 5 is installed inside the door frame 1, and the door leaf 5 is connected to form a composite door body through a hinge arranged in the vertical direction inside the door frame 1, wherein the door frame 1 comprises a door frame panel 9 and a door frame substrate 10, and the door leaf 5 comprises a first door leaf panel 3, a second door leaf panel 4, a door leaf frame 6 and a filling core material; the first door leaf panel 3 and the second door leaf panel 4 are respectively arranged on the front and back sides of the composite door body, and one end face of the door leaf 5 is rotatably connected to one end face inside the door frame 1 through a hinge; the first door leaf panel 3, the second door leaf panel 4 and the door frame panel 9 are pasted with synchronous grain impregnated paper, and the wood grain texture on the surface of the synchronous grain impregnated paper is synchronously emerged on the surface of the door leaf and the door frame after hot pressing. The door frame panel 9 is pasted on the surface of the door frame substrate 10, and the door frame substrate 10 is formed by cold-pressing and bonding high-density fiberboard or medium-density fiberboard with plywood. It also includes a first door frame 2, which is arranged on the front end face of the door frame 1, and a second door frame 8 is arranged on the rear end face of the door frame 1, wherein a door frame stopper 7 is arranged on the surface between the first door frame 2 and the second door frame 8; at least two door frame stoppers 7 are installed. The surface texture and color of the first door frame 2, the second door frame 8 and the door frame stopper 7 are the same as those of the composite door body. The door leaf frame 6 is spliced ​​by laminated veneer lumber (LVL), and the filling core material is arranged inside the door leaf frame 6, which is laminated veneer lumber, bridge hole mechanical board, honeycomb paper or honeycomb aluminum sheet. Example 6

[0031] A method for manufacturing a synchronously-grained composite door comprises the following steps: (1) Material preparation: Use an electronic saw to cut medium-density fiberboard (MDF) into 2450×1230×4.75mm dimensions as the base material for the door leaf and door frame panel, and perform sanding. Select melamine decorative paper printed with yellow oak grain, and customize steel plates printed with the same grain and embossed effect; (2) Preparation of synchronously matched grain panels: install the steel plate on the upper heat conduction plate of the hot press, and set the hot pressing process parameters to a pressure of 18.0 MPa, a temperature of 200°C, and a time of 10 seconds. Fix the embossed steel plate on the upper heat conduction plate of the press, with the side of the embossed steel plate with the wood grain texture and the grain marking facing downward; place the pad, substrate, and decorative paper on the lower heat conduction plate of the press from bottom to top. The decorative paper is impregnated with a composite melamine resin, and the placement of the pad and the decorative paper is adjusted until the texture of the decorative paper completely overlaps with the texture of the steel plate. Then, start the press to lower the upper heat conduction plate, close it, and apply pressure, so that the impregnated film paper is pressed against the substrate to be produced and a synchronously matched grain impregnated paper panel is formed; (3) Preparation of door leaf for synchronously matched composite door: The first panel of the door leaf, the door leaf frame (including filling core material) and the second panel of the door leaf are placed on the lower pressing plate of the cold press from bottom to top, and the cold pressing process parameters are set to 19MPa and the time is 4h. Then the press is started to make the upper pressing plate descend, close and pressurize to form a door leaf blank. After that, the door leaf of the synchronously matched composite door is formed through cutting, edge sealing and other processes; (4) Preparation of door frame for synchronously matched composite door: The base material and panel of the door frame are placed on the lower platen of the cold press from bottom to top, and the cold pressing process parameters are set to 3.0 MPa and the time is 6 hours. Then the press is started to make the upper platen descend, close and pressurize to form a door frame blank. After that, the door frame of the synchronously matched composite door is formed through cutting, edge sealing and other processes; (5) Preparation of other components: Use melamine impregnated decorative paper or PVC veneer technology to make the first door frame, the second door frame and the door frame stop strip with the same color as the composite door texture, and splice the above components with the door leaf and door frame through hinges to assemble them into a synchronous composite door. Example 7

[0032] A method for manufacturing a synchronously-grained composite door comprises the following steps: (1) Material preparation: Use an electronic saw to cut medium-density fiberboard (MDF) into 2250×1160×4.75mm dimensions as the base material for the door leaf and door frame panel, and perform sanding. Select melamine decorative paper printed with sapele wood grain, and customize steel plates printed with the same grain and embossed effect; (2) Preparation of synchronously matched grain panels: install the steel plate on the upper heat-conducting plate of the hot press, and set the hot pressing process parameters to pressure 17.0 MPa, temperature 180°C, and time 8s. Fix the embossed steel plate on the upper heat-conducting plate of the press, with the side of the embossed steel plate with wood grain texture and matching grain marks facing down; place the pad, substrate and decorative paper on the lower heat-conducting plate of the press from bottom to top. The decorative paper is impregnated with composite melamine resin, and the placement of the pad and decorative paper is adjusted until the texture of the decorative paper completely overlaps with the texture of the steel plate, then start the press to lower the upper heat-conducting plate, close it and apply pressure, so that the impregnated film paper is pressed against the substrate to be produced and a synchronously matched grain impregnated paper panel is formed; (3) Preparation of door leaf for synchronously matched composite door: The first panel of the door leaf, the door leaf frame (including filling core material) and the second panel of the door leaf are placed on the lower pressing plate of the cold press from bottom to top, and the cold pressing process parameters are set to 2.5MPa and the time is 8h. Then the press is started to make the upper pressing plate descend, close and pressurize to form the door leaf blank. After that, the door leaf of the synchronously matched composite door is formed through cutting, edge sealing and other processes; (4) Preparation of door frame for synchronously matched composite door: The base material and panel of the door frame are placed on the lower platen of the cold press from bottom to top, and the cold pressing process parameters are set to 2.5MPa and the time is 8h. Then the press is started to make the upper platen descend, close and pressurize to form a door frame blank. After that, the door frame of the synchronously matched composite door is formed through cutting, edge sealing and other processes; (5) Preparation of other components: Use melamine impregnated decorative paper or PVC veneer technology to make the first door frame, the second door frame and the door frame stop strip with the same color as the composite door texture, and splice the above components with the door leaf and door frame through hinges to assemble them into a synchronous composite door.

[0033] The above descriptions are merely embodiments of the present invention and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the specification of the present invention, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A synchronously matched-grain composite door, comprising a door frame (1), a door leaf (5) being installed inside the door frame (1), and the door leaf (5) being connected by hinges arranged in a vertical direction inside the door frame (1) to form a composite door body, characterized in that: The door frame (1) comprises a door frame panel (9) and a door frame base material (10), and the door leaf (5) comprises a first door leaf panel (3), a second door leaf panel (4), a door leaf frame (6) and a filling core material; the first door leaf panel (3) and the second door leaf panel (4) are respectively arranged on the front and back sides of the composite door body, and one end face of the door leaf (5) is rotatably connected to one end face inside the door frame (1) via a hinge; the surfaces of the first door leaf panel (3), the second door leaf panel (4) and the door frame panel (9) are affixed with synchronously matched grain impregnated paper, and the wood grain texture on the surface of the synchronously matched grain impregnated paper is synchronously emerged on the surfaces of the door leaf and the door frame after hot pressing.

2. The synchronously matched composite door according to claim 1, characterized in that: The invention also comprises a first door frame (2) arranged on the front end face of the door frame (1), and a second door frame (8) is arranged on the rear end face of the door frame (1), wherein a door frame stop strip (7) is arranged on the surface between the first door frame (2) and the second door frame (8); furthermore, at least two door frame stop strips (7) are installed; and the surface texture color of the first door frame (2), the second door frame (8) and the door frame stop strip (7) is the same as that of the composite door body.

3. The synchronous pattern composite door according to claim 1, characterized in that: The door frame panel (9) is attached to the surface of a door frame substrate (10), and the door frame substrate (10) is formed by cold-pressing and bonding a high-density fiberboard or a medium-density fiberboard and a plywood, preferably a medium-density fiberboard and a plywood.

4. The synchronously matched composite door according to claim 1, characterized in that: The door leaf frame (6) is formed by splicing single-plate laminated timber; the filling core material is arranged inside the door leaf frame (6), and is single-plate laminated timber, bridge hole mechanical plate, honeycomb paper or honeycomb aluminum sheet, preferably honeycomb paper.

5. A method for preparing a synchronously matched composite door as claimed in any one of claims 1 to 4, characterized in that: The steps include: A. Customizing a synchronous embossed steel plate according to the color and pattern of the wood grain texture of the specific decorative texture melamine decorative impregnated film paper, so that the surface of the synchronous embossed steel plate has the same raised wood grain texture, i.e., relief effect, and the grain mark; sanding the substrate used for preparing the door leaf and door frame and the decorative paper; B. Fix the synchronous embossed steel plate on the upper heat conducting plate of the press, with the side of the steel plate with the wood grain texture and the grain matching mark facing downward; place the pad, the above-mentioned substrate and the decorative paper in order from bottom to top on the lower heat conducting plate of the press, adjust the positions of the pad and the decorative paper until the texture of the decorative paper completely overlaps with the texture of the steel plate, then start the press to make the upper heat conducting plate descend and close and apply pressure for hot pressing, so that the decorative paper is pressed on the surface of the substrate to form a synchronous grain matching impregnated paper panel; C. Cut the synchronously matched impregnated paper panels into sizes matching the door leaf frame (6), apply polyvinyl acetate composite adhesive evenly on the non-textured surfaces of the two panels, place them on both sides of the main door frame, and use a cold press to cold-press them into the synchronously matched composite door leaf (5); D. cutting the synchronously matched grain impregnated paper panel into a size matching the door frame substrate (10), applying polyvinyl acetate composite adhesive evenly on the non-textured surface of the panel, placing it on the non-fiberboard side of the door frame substrate, using a cold press to cold-press it into a door frame (1) of a synchronously matched grain composite door, and using a slotting machine to slot one side of the panel, applying polyvinyl acetate composite adhesive in the slot, installing the door frame stopper (7), and then nailing it on the side without the decorative panel so that the door frame stopper (7) is tightly combined with the door frame substrate; E. The first door frame (2), the second door frame (8) and the door frame stopper (7) having the same color as the composite door texture are spliced ​​together with the door leaf (5) and the door frame (1) through hinges to form a synchronously matched composite door.

6. The method for manufacturing a synchronously-matched composite door according to claim 5, characterized in that: The substrate in step A is medium density fiberboard.

7. The method for manufacturing a synchronously-matched composite door according to claim 5, characterized in that: The process parameters of the hot pressing in step B are 15-20 MPa, 150-220° C., and time 8-15 s, preferably 18 MPa, 180° C., and time 10 s.

8. The method for manufacturing a synchronously-matched composite door according to claim 5, characterized in that: In step C, a door leaf (5) of a synchronously matched composite door is formed by cold pressing with a cold press. The first panel (3) of the door leaf, the door leaf frame (6) (containing a filling core material) and the second panel (4) of the door leaf are placed on the lower pressing plate of the cold press in order from bottom to top. The cold pressing process parameters are set to 2-12 MPa, time 4-6 h, preferably 5.0 MPa, time 5 h, and then the press is started to make the upper pressing plate descend, close and pressurize to form a door leaf blank, which is then cut and edge-sealed to form the door leaf (5) of the synchronously matched composite door; the door leaf frame (6) is spliced ​​from 15-50 mm, preferably 30 mm thick veneer laminate (LVL), and the interior is filled with honeycomb paper as a core material.

9. The method for manufacturing a synchronously-matched composite door according to claim 5, characterized in that: In step D, a door frame (1) of a composite door with synchronous grain is formed by cold pressing with a cold press. A door frame substrate (10) and a door frame panel (9) are placed on the lower pressing plate of the cold press in order from bottom to top. The cold pressing process parameters are set to a pressure of 15 to 20 MPa and a time of 4 to 8 hours, preferably 18.0 MPa and a time of 6 hours. The press is started to close the upper pressing plate and pressurize to form a door frame blank. The door frame (1) of the composite door with synchronous grain is then formed through cutting and edge sealing processes. The door frame substrate (10) is formed by cold pressing and bonding two pieces of medium density fiberboard with a thickness of 4.75 mm and plywood with a thickness of 15 mm on both sides.

10. The method for manufacturing a synchronously-matched composite door according to claim 5, characterized in that: The first door frame (2), the second door frame (8) and the door frame stopper (7) of the same color as the composite door texture in step E are made of melamine impregnated decorative paper or PVC veneer, which is the same color as the composite door texture.

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