CN115008558A - Plate bending process with bending structure and manufactured composite plate - Google Patents

Plate bending process with bending structure and manufactured composite plate Download PDF

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Publication number
CN115008558A
CN115008558A CN202210529434.5A CN202210529434A CN115008558A CN 115008558 A CN115008558 A CN 115008558A CN 202210529434 A CN202210529434 A CN 202210529434A CN 115008558 A CN115008558 A CN 115008558A
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bending
impregnated paper
paper layer
melamine
layer
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CN115008558B (en
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谭东平
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Dongguan Huiqiaoli Decoration Materials Co ltd
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Dongguan Huiqiaoli Decoration Materials Co ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D1/00—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring
    • B27D1/04—Joining wood veneer with any material; Forming articles thereby; Preparatory processing of surfaces to be joined, e.g. scoring to produce plywood or articles made therefrom; Plywood sheets
    • B27D1/08—Manufacture of shaped articles; Presses specially designed therefor
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D3/00—Veneer presses; Press plates; Plywood presses
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B27—WORKING OR PRESERVING WOOD OR SIMILAR MATERIAL; NAILING OR STAPLING MACHINES IN GENERAL
    • B27D—WORKING VENEER OR PLYWOOD
    • B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J7/00—Adhesives in the form of films or foils
    • C09J7/20—Adhesives in the form of films or foils characterised by their carriers
    • C09J7/29—Laminated material
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/28—Presence of paper
    • C09J2400/283—Presence of paper in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2400/00—Presence of inorganic and organic materials
    • C09J2400/20—Presence of organic materials
    • C09J2400/30—Presence of wood
    • C09J2400/303—Presence of wood in the substrate
    • C—CHEMISTRY; METALLURGY
    • C09—DYES; PAINTS; POLISHES; NATURAL RESINS; ADHESIVES; COMPOSITIONS NOT OTHERWISE PROVIDED FOR; APPLICATIONS OF MATERIALS NOT OTHERWISE PROVIDED FOR
    • C09J—ADHESIVES; NON-MECHANICAL ASPECTS OF ADHESIVE PROCESSES IN GENERAL; ADHESIVE PROCESSES NOT PROVIDED FOR ELSEWHERE; USE OF MATERIALS AS ADHESIVES
    • C09J2467/00—Presence of polyester
    • C09J2467/006—Presence of polyester in the substrate
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T50/00—Aeronautics or air transport
    • Y02T50/40—Weight reduction

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  • Life Sciences & Earth Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Wood Science & Technology (AREA)
  • Forests & Forestry (AREA)
  • Manufacturing & Machinery (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Laminated Bodies (AREA)

Abstract

The application relates to the technical field of plates, in particular to a plate bending process with a bending structure and a manufactured composite plate, wherein the bending process comprises the following steps of: s1, firstly, laminating the board layer and the melamine impregnated paper layer to form a board, adhering the PET high-temperature adhesive tape to the melamine impregnated paper layer, and opening a bending groove 4 at the bending position of the board layer by the grooving process of the board adhered with the PET high-temperature adhesive tape; s2, injecting the soaking solution into the bending groove 4, soaking for 10-300 min, and airing, wherein the humidity is measured to be 18-40%; and S3, injecting the molten hot melt adhesive into the bending groove 4, and simultaneously performing bending treatment, wherein the bending angle is less than or equal to 90 degrees, so as to obtain the plate with the bending structure. This application is through above-mentioned operating procedure, changes the moisture content of melamine impregnated paper layer, and then increases the toughness of melamine impregnated paper layer department of bending for melamine impregnated paper layer department of bending is softer, when bending, and melamine impregnated paper layer department of bending is difficult for the fracture, makes panel also difficult for the fracture for long-time use in dry area simultaneously.

Description

Plate bending process with bending structure and manufactured composite plate
Technical Field
The application relates to the technical field of plates, in particular to a plate bending process with a bending structure and a composite plate manufactured by the same.
Background
At present, melamine boards on the market have the advantages of high surface hardness, good wear resistance, rich color, good heat resistance and the like, and are commonly used for wooden products in the wall decoration industry.
The preparation process of the melamine board comprises the following steps: paper with different colors or textures is soaked in melamine glue solution, dried to a certain curing degree, paved on the surfaces of shaving boards, medium-density fiberboards or hard fiberboards and the like, and hot-pressed to form the melamine board.
And at present, the melamine board needs to be bent before being used, if the melamine board after being bent and processed is used for coating a part with a bent structure, in the process of bending the melamine board, the melamine layer at the bent part is easy to crack due to certain hardness after being cured, and the quality of the melamine board is poor.
Therefore, people coat the softener on the surface of the melamine layer to achieve the purpose of softening the melamine layer, thereby facilitating bending. However, the softener softens the melamine layer by destroying the structure of melamine, and when the melamine board is used in a dry environment for a long time, the bent part of the melamine layer with the damaged structure is easy to crack due to the softener, which affects normal use of the melamine board, especially in winter in the north of China, the weather is dry and the duration is long in winter in the north, and the bent part of the melamine layer is easy to crack, so improvement is needed.
Disclosure of Invention
In order to solve the problem that a melamine impregnated paper layer is easy to crack after being bent and the bent paper layer is easy to crack when being used in a dry place, the application provides a plate bending process with a bending structure and a manufactured composite plate.
In a first aspect, the application provides a plate bending process with a bending structure, which adopts the following technical scheme: a plate bending process with a bending structure comprises the following steps:
s1, firstly, laminating the board layer and the melamine impregnated paper layer to form a board, adhering the PET high-temperature adhesive tape to the melamine impregnated paper layer, and opening a bending groove at the bending position of the board layer by the grooving process of the board adhered with the PET high-temperature adhesive tape;
s2, injecting the impregnating solution into a bending groove, soaking for 10-300 min, and airing, wherein the measured humidity is 18-40%;
s3, injecting the molten hot melt adhesive into a bending groove, and simultaneously performing bending treatment, wherein the bending angle is less than or equal to 90 degrees, so as to obtain a plate with a bending structure;
the immersion liquid in the step S2 is one of water or an alkali solution, the alkali solution is prepared from phosphate and distilled water according to the weight ratio of 1 (2-5), and the phosphate is prepared from potassium tripolyphosphate, sodium pyrophosphate, tetrapotassium pyrophosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate and potassium dihydrogen phosphate according to the weight ratio of (5-7): (5-7): (2-4): (1-3): (1-3): 1 are mixed to obtain the product.
Through adopting above-mentioned infiltration processing, change the moisture content of melamine impregnated paper layer department of bending, and then increase the toughness of melamine impregnated paper layer, reduce the condition of melamine impregnated paper fracture when buckling, make melamine impregnated paper layer department of bending simultaneously, can also be difficult for the fracture in dry area long-time use.
It is known in the art that when a plate is bent, the structural damage of an external force to the melamine impregnated paper layer is irreversible, the texture of the melamine impregnated paper layer is relatively hard, and if the melamine impregnated paper layer is directly bent, the bent part of the melamine impregnated paper layer is easy to crack, so that permanent damage can be caused.
Consequently, bend the department to melamine impregnated paper layer before bending and carry out soaking treatment, make melamine impregnated paper layer absorb water, moisture content increases to improve melamine impregnated paper layer and panel layer toughness, melamine impregnated paper layer and panel are softer, and external force reduces the structural damage degree on panel layer and melamine impregnated paper layer, makes the structure on panel layer and melamine impregnated paper layer keep intact.
When the humidity of the dried melamine impregnated paper layer is less than 18%, the melamine impregnated paper layer has insufficient water content, toughness cannot meet the requirement, the melamine impregnated paper layer has insufficient softness, and the melamine impregnated paper layer is easy to crack during bending, and is easy to crack even if the melamine impregnated paper layer is not cracked during bending but is used in a dry area; when the humidity of the dried melamine impregnated paper layer is more than 40%, the water content is too high, the melamine impregnated paper layer and the board layer are easily layered, and the use of the board is not facilitated.
And after the board layer and the melamine impregnated paper are pressed, grooving the board layer, so that the distance between the bottom of the bending groove and the melamine impregnated paper layer is 0.1-0.8 mm, and the soaking solution can conveniently penetrate through the board layer to contact with the melamine impregnated paper layer for soaking.
The time for soaking the melamine impregnated paper by using water is long, so potassium tripolyphosphate, sodium pyrophosphate, tetrapotassium pyrophosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate, potassium dihydrogen phosphate and water are preferably made into the soaking liquid in the paper, the soaking liquid is alkaline, the melamine impregnated paper layer is alkaline, the soaking liquid has good affinity for the melamine impregnated paper layer, the melamine impregnated paper layer has a three-dimensional network structure, the soaking liquid can more easily enter the melamine impregnated paper, the water content of the melamine impregnated paper layer is increased, the toughness of the melamine impregnated paper layer is improved, and the cracking condition of the melamine impregnated paper is reduced.
The PET high-temperature adhesive tape is used for being attached to the surface of the melamine impregnated paper layer, and when the melamine impregnated paper layer is bent, the PET high-temperature adhesive tape has a supporting effect on the melamine impregnated paper layer, so that the melamine impregnated paper layer can be protected from being broken when the melamine impregnated paper layer is bent to change the shape.
When the hot melt adhesive pours into the bending groove, the temperature of the inside of the bending groove increases in the twinkling of an eye, under the effect of high temperature, the melamine impregnated paper layer and the board layer soften in the twinkling of an eye, are convenient for bend, enable the angle of bending to reach 90, and the hot melt adhesive can solidify in the short time, after the solidification, can finalize the design to the panel after bending, make the panel non-deformable after bending.
Preferably, the melting temperature of the hot melt adhesive is 140-210 ℃.
By adopting the technical scheme, the melamine impregnated paper layer can achieve the purpose of instant softening under the action of high temperature, and the melamine impregnated paper layer becomes soft, so that the melamine impregnated paper layer is not easy to crack when being bent, and a board with a complete shape is obtained; the melamine impregnated paper is soaked by the impregnating solution before the hot melt adhesive is added, the toughness is increased, and the high-temperature action of the hot melt adhesive is combined, so that the melamine impregnated paper layer is not easy to crack during bending, when the melting temperature of the hot melt adhesive is lower than 140 ℃, the melamine impregnated paper layer cannot be instantly softened at a low temperature, and the bending effect of the melamine impregnated paper layer is not good during bending; when the temperature of the hot melt adhesive is higher than 210 ℃, the temperature is too high, and the melamine impregnated paper layer is too soft and is not easy to bend and shape.
The hot melt adhesive that this application used is the EVA hot melt adhesive, and EVA hot melt adhesive adds the mobility after the hot melt adhesive is melted good, and has certain viscidity for in the bending groove of this application, can extend fast and pave in the bending groove for the part that melamine impregnated paper layer corresponds the bending is heated evenly, softens evenly, is difficult for the fracture when bending.
Mode that can adopt the point to glue injects the hot melt adhesive into the groove of bending in this application, and the mode of gluing can inject the hot melt adhesive into the groove of bending uniformly, makes melamine impregnated paper layer be heated more evenly, softens more evenly, is difficult for the fracture when bending.
And moreover, the PET high-temperature adhesive tape is attached to the surface of the melamine impregnated paper layer, the melamine impregnated paper layer is coated, in the soaking process, the impregnating solution permeates to the melamine impregnated paper layer from the bottom of the bending groove of the plate, and the part of the melamine impregnated paper layer corresponding to the bending groove can be fully soaked with the impregnating solution in the permeating process, so that the part of the melamine impregnated paper layer corresponding to the bending groove is not easy to crack in the bending process.
And PET high temperature sticky tape subsides then carry out the cladding protection to the melamine impregnated paper layer after soaking, make the hot melt adhesive pour into the bending groove on panel layer into, melamine impregnated paper layer's the department of bending is difficult for receiving the hot melt adhesive influence of high temperature and the moisture that appears soaking volatilizes completely, the moisture of the edge that melamine impregnated paper layer corresponds the panel side probably appears the evaporation of being heated, and the moisture of the middle part position of melamine impregnated paper layer, then difficult evaporation is down pasted at the cladding guard action of PET high temperature sticky tape, make melamine impregnated paper layer keep enough moisture, in order to reach good toughness, make the panel that has bending structure who makes use difficult fracture under dry environment for a long time.
Preferably, the humidity of the bending part of the melamine impregnated paper layer dried in the step S1 is 30-40%.
Through adopting above-mentioned technical scheme for melamine impregnated paper layer department of bending contains sufficient moisture, increases the toughness of melamine impregnated paper layer department of bending, improves melamine impregnated paper layer compliance, makes melamine impregnated paper layer when bending, and difficult the fracture appears, and melamine impregnated paper layer department of bending contains sufficient moisture simultaneously, can use in dry area for a long time and not fracture.
Preferably, the melamine impregnated paper layer is prepared by soaking a paper layer in melamine glue solution and drying, wherein the melamine glue solution is prepared from the following raw materials in parts by weight:
50-70 parts of melamine
50-60 parts of formaldehyde water solution with mass fraction of 20-30%
20-30 parts of citric acid solution with mass fraction of 10-20%
1-2 parts of triethylamine
20-30 parts of urea-formaldehyde resin
5-10 parts of water absorbent
20-30 parts of polyacrylic acid.
Through adopting above-mentioned technical scheme, the melamine impregnated paper layer of making department of bending can absorb water and can store the moisture that absorbs, makes the toughness of melamine impregnated paper layer department of bending increase, is difficult for the fracture when bending, can use for a long time in dry area and not fracture simultaneously. The melamine and formaldehyde aqueous solution react to generate melamine formaldehyde resin under the action of triethylamine, the melamine formaldehyde resin has good wear resistance, the color and luster of the impregnated paper can be maintained, and the melamine impregnated paper is further protected.
However, melamine formaldehyde resin is easy to crack when being bent, and the bent part is also easy to crack when being used for a long time in a dry area, and the adopted water absorbent can absorb external water and lock the water, so that the melamine glue solution has water. Utilize above-mentioned melamine glue solution to soak impregnated paper after, and detach the back through the drying, form panel with the pressfitting of panel layer looks again, melamine impregnated paper layer in the panel then contains the water absorbent, make soaking to the infiltration liquid in-process, melamine impregnated paper layer that contains the water absorbent can accelerate the absorption moisture, it is 18~40% to dry to melamine impregnated paper layer department of bending humidity again, can further increase the toughness of melamine impregnated paper layer department of bending, make external force reduce the structural damage of melamine impregnated paper layer department of bending, make the structure on melamine impregnated paper layer keep complete, melamine impregnated paper layer department of bending is difficult to the fracture.
The paper moisture in the melamine impregnated paper layer is preferably dried in the drying process, and the moisture adsorbed by the water absorbent is not easy to dry and remove, so that the melamine impregnated paper layer has excellent toughness under the condition of containing certain moisture; and when the water absorbent is in a dry area, the water absorbent can absorb the moisture in the melamine impregnated paper layer, so that the moisture is difficult to volatilize, and the melamine impregnated paper can be used for a long time in the dry area without cracking.
The melamine formaldehyde resin has short shelf life, and the melamine impregnated paper layer is easy to crack after long-time use, so that polyacrylic acid, urea-formaldehyde resin and melamine formaldehyde resin are added in the melamine impregnated paper layer, the polyacrylic acid and the urea-formaldehyde resin are uniformly mixed, the properties of the polyacrylic acid and the urea-formaldehyde resin are relatively stable, the melamine impregnated paper layer is formed, the shelf life of the melamine impregnated paper layer is prolonged, the service life of a plate is prolonged, and the urea-formaldehyde resin and the melamine formaldehyde resin are matched for use, so that the wear resistance of the melamine impregnated paper layer can be increased.
The water absorbent is added into the melamine glue solution, so that the water content of the cured melamine impregnated paper layer is increased, and the bonding degree of the melamine impregnated paper layer and the board layer is reduced.
Consequently, add polyacrylic acid to the melamine glue solution in this application, can make melamine impregnated paper layer pressfitting with the panel layer more easily, when melamine impregnated paper layer and panel layer carry out the pressfitting, the polyacrylic acid on melamine impregnated paper layer surface is melted in the rise of lamination temperature, polyacrylic acid and panel surface contact, make melamine impregnated paper layer and panel layer bonding and be difficult for droing, polyacrylic acid can increase melamine glue solution viscosity in addition, make melamine glue solution can stably adhere to on paper layer paper surface, make melamine impregnated paper layer be difficult to the layering when buckling, and can use for a long time in dry area.
Preferably, the melamine glue solution is prepared by the following steps:
1) according to the weight parts, firstly, uniformly mixing 20-30% of formaldehyde aqueous solution and 10-20% of citric acid solution, adding melamine, heating while stirring, reacting for 30-40 min after heating to 75-80 ℃, adding triethylamine, and reacting for 20-40 min to obtain a mixture;
2) according to the weight parts, urea resin, a water absorbent and polyacrylic acid are uniformly mixed with the mixture prepared in the step 1), the temperature is raised to 95-105 ℃, and the mixture is stirred for 10-20 min to obtain melamine glue solution.
The melamine glue solution prepared by the method is used for preparing the melamine impregnated paper layer, the melamine impregnated paper layer can absorb water and can be stored, and when the melamine impregnated paper layer is soaked in the impregnating solution, the water is absorbed and locked, so that the toughness of the melamine impregnated paper layer is improved, the melamine impregnated paper layer is not easy to crack when being bent, and meanwhile, the melamine impregnated paper layer can be used for a long time in a dry area without cracking.
After the water absorbent is mixed with the intermediate, the water absorbent can absorb the water in the system and can play a role in adjusting the viscosity of the system, so that the melamine glue solution has certain viscosity and is easy to adhere to a paper layer.
After the paper layer is soaked in the melamine glue solution, components such as a water absorbent, urea resin, polyacrylic acid and an intermediate can be adhered to the paper layer, on one hand, the glue solution combined with coating can be stably adhered to a board layer and a PET high-temperature adhesive tape, on the other hand, the melamine impregnated paper layer containing the water absorbent component can keep certain humidity, and has excellent toughness.
And then, adhering and pressing the melamine impregnated paper layer containing certain humidity and viscosity with the board layer and the PET high-temperature adhesive tape to form the composite board, wherein certain temperature and pressure conditions may exist in the pressing process to cause the moisture in the melamine impregnated paper layer to be lost, so that the bending groove of the composite board is subsequently infiltrated and dried, and the infiltration liquid is infiltrated into the melamine impregnated paper layer through the groove bottom of the bending groove to ensure that the humidity of the melamine impregnated paper layer in the composite board is 18-40%.
Because the melamine impregnated paper layer is soaked and dried, the humidity of the melamine impregnated paper layer is controlled to be 18-40%, so that the melamine impregnated paper layer is not easy to crack in the bending treatment process, the moisture absorbed by the contained water absorbent is not easy to volatilize, a certain moisture content of the melamine impregnated paper layer can be maintained, and the melamine impregnated paper layer is not easy to crack after long-term use in a dry environment.
Moreover, when the in-process of bending pours into the hot melt adhesive into the groove of bending into, PET high temperature sticky tape plays the cladding guard action to melamine impregnated paper layer for the temperature of hot melt adhesive is difficult to the evaporation to dryness with the moisture in the melamine impregnated paper layer, makes melamine impregnated paper layer keep certain humidity.
Before the step S1 in the present application, the raw paper needs to be treated by using the prepared melamine glue solution, and the treatment process is as follows:
completely soaking paper in melamine glue solution for 10-20 min, drying at 90-100 ℃ until the surface does not flow, then passing the dried impregnated paper through two glue coating rollers, coating glue on the upper and lower surfaces of the dried impregnated paper, and coating the wet quantity of 20-30 g/cm 2 And drying at 100-110 ℃.
Preferably, each part of the water absorbent is prepared from sodium alginate, anhydrous copper sulfate, polyvinyl alcohol and water according to the weight part ratio of (5-10): (1-5): (10-15) 10.
Firstly, polyvinyl alcohol is dissolved in water, and then sodium alginate and anhydrous copper sulfate are added to prepare the water absorbent. The polyvinyl alcohol contains more hydroxyl groups and can form hydrogen bonds with water, so that the effect of water absorption and water locking is achieved, however, after water is absorbed in the polyvinyl alcohol, water can be gradually dissipated in subsequent use, the moisture content of the melamine impregnated paper layer is reduced, the humidity is reduced, and the melamine impregnated paper layer is easy to crack.
Therefore, sodium alginate and anhydrous copper sulfate are added into the water absorbent, the sodium alginate can increase the viscosity of the water absorbent, the volatilization speed of water in the water absorbent is reduced, the anhydrous copper sulfate can convert free water into bound water, the bound water is difficult to fall off from the anhydrous copper sulfate, the water content in the water absorbent is stable, the water content of the plate layer and the melamine impregnated paper layer is changed, the toughness of the melamine impregnated paper layer is increased and decreased, cracking of the melamine impregnated paper layer is reduced during bending, and meanwhile, the melamine impregnated paper layer is prevented from cracking after being used for a long time in a dry area.
In a second aspect, the application provides a composite board with a bending structure, which adopts the following technical scheme:
the utility model provides a take bending structure's composite board, composite board includes panel layer, melamine impregnated paper layer and PET high temperature adhesive tape layer, melamine impregnated paper layer surface with panel layer surface connection, another surface of melamine impregnated paper layer with PET high temperature adhesive tape layer surface connection, the bending groove has been seted up on the panel layer, the inside hot melt adhesive that pours into of bending groove.
By adopting the technical scheme, the melamine impregnated paper layer is not easy to crack when the composite board is bent, and the melamine impregnated paper layer can be used for a long time in a dry area without cracking. The PET high-temperature adhesive tape layer has a supporting effect on the melamine impregnated paper layer, so that the melamine impregnated paper layer can be protected from cracking when the shape is changed, and the surface of the melamine impregnated paper layer is also protected, so that the plate is not easy to be worn out in the using process. The groove of bending is seted up for panel corresponds the thickness at the groove position of bending and reduces, makes panel can bend, and the hot melt adhesive pours into to the groove of bending, can soften in the twinkling of an eye by panel, and then makes panel can buckle towards the notch of seting up of groove of bending, and the groove of bending can be protected after the hot melt adhesive solidification simultaneously.
Preferably, the distance between the bottom of the bending groove and the melamine impregnated paper layer is 0.1-0.8 mm.
By adopting the technical scheme, the infiltration liquid can penetrate into the melamine impregnated paper layer through the bottom of the bending groove, and the part of the melamine impregnated paper layer corresponding to the bending groove is softened, so that the melamine impregnated paper layer is not easy to crack in the bending process; and make the high hot melt adhesive of temperature can transmit the temperature to panel layer and melamine impregnated paper layer fast for melamine impregnated paper layer can soften in the twinkling of an eye under the effect of high temperature, and then is convenient for buckle, and is difficult for the fracture among the bending process. When the distance between the bottom of the bending groove and the melamine impregnated paper layer is less than 0.1mm, the board layer is easy to break in the bending process; when the distance between the bottom of the bending groove and the melamine impregnated paper layer is larger than 0.8mm, the hot melt adhesive with high temperature cannot rapidly transmit high temperature to the melamine impregnated paper layer, the melamine layer cannot be instantly softened, and the melamine layer is easy to crack in the bending process.
Preferably, the sheet material layer is one of a plywood layer, a density board layer, a carbon wafer layer or a moisture-proof board layer.
By adopting the technical scheme, the melamine impregnated paper layer is more widely applied, more functions are given to the board, and the practicability of the board is improved. The plywood layer is a three-layer or multi-layer plate material formed by rotationally cutting wood sections into veneers or slicing battens into veneers and then gluing the veneers with an adhesive, and the three-layer or multi-layer plate material and the melamine impregnated paper layer are used for preparing the board, so that the board can be used for airplanes, ships, trains, automobiles, buildings, packing boxes and the like, the impregnating solution can soak the plywood layer, but the alkaline of the impregnating solution is weak, the plywood layer cannot be damaged, the moisture in the plywood layer can volatilize in the subsequent use process, and the structure of the plywood layer cannot be changed.
The density board layer is a board which is made by using wood fiber or other plant fiber as raw materials, preparing the raw materials by fiber, applying synthetic resin, pressing the raw materials under the condition of heating and pressurizing, wherein the surface of the density board layer is smooth and flat, the material is fine and compact, the performance is stable, but the moisture resistance of the density board is poor, the moisture resistance of the density board layer can be reduced when the density board layer is used for preparing the board, the moisture resistance of the board can be improved when the density board layer is used for preparing the board by sharing with the melamine impregnated paper layer, the decoration of the surface of the board is good, and the density board layer can be soaked by the impregnating solution in the same way, but the alkalinity of the impregnating solution is weak, the density board layer can not be damaged, the moisture in the density board layer can be volatilized in the subsequent use process, and the structure of the plywood layer can not be changed.
The carbon crystal plate is a modified and purified carbon particle heating product, short-filament carbon fibers are modified and then are subjected to physical ball milling treatment to prepare microcrystal particles, and then a far infrared emitting agent is added, and the carbon crystal plate is generally prepared by one to two times of packaging and pressing through a special process.
The moisture-proof board layer is used for preventing moisture, is often applied to places which are easy to be wet in bathrooms and bathrooms, is prepared from waterproof materials, and is weakly alkaline and cannot enter the moisture-proof board layer.
In summary, the present application has the following beneficial effects:
1. according to the method, a plate and melamine impregnated paper are pressed into the plate, then the PET high-temperature adhesive tape is attached to the surface of the melamine impregnated paper layer, and a bending groove is formed in the plate layer; then injecting the immersion liquid and the immersion liquid into a bending groove, soaking, airing and measuring the humidity; injecting the molten hot melt adhesive into a bending groove, and simultaneously performing bending treatment, wherein the bending angle is 0-90 degrees, so as to prepare a plate with a bending structure; through above-mentioned operating procedure, change the moisture content of melamine impregnated paper layer, and then increase the toughness of melamine impregnated paper layer for melamine impregnated paper layer is softer, when bending, and melamine impregnated paper layer is difficult for the fracture, obtains the complete panel of shape, makes panel also difficult for the fracture for a long time use in dry area simultaneously.
2. The melamine impregnated paper layer is prepared by soaking a paper layer in melamine glue solution and drying, wherein the melamine glue solution is prepared from the following raw materials: the melamine impregnated paper layer is prepared from melamine, a 20-30% mass percent aqueous solution of formaldehyde, 10-20% mass percent citric acid solution, triethylamine, urea-formaldehyde resin, a water absorbent and polyacrylic acid, and can absorb water and store, so that the toughness of the melamine impregnated paper layer is increased, the melamine impregnated paper layer is not easy to crack during bending, and the melamine impregnated paper layer can be used for a long time in a dry area without cracking.
Drawings
Fig. 1 is a schematic view of a layer structure of a composite board with a bending structure according to the present application.
Reference numerals: 1. a sheet layer; 2. a melamine impregnated paper layer; 3. a PET high-temperature adhesive tape layer; 4. and bending the groove.
Detailed Description
The present application will be described in further detail with reference to FIG. 1, examples and comparative examples. The starting materials used in the present application are commercially available.
Preparation examples 1 to 3
The average molecular mass of the urea resin used in the preparation example is 10000, and the relative molecular mass of the polyacrylic acid is 10-25 ten thousand.
Preparation example 1
The melamine glue solution is prepared by the following method:
1) weighing 0.55Kg of formaldehyde aqueous solution with the mass fraction of 20% and 0.2Kg of citric acid solution with the mass fraction of 10%, uniformly mixing, adding 0.5Kg of melamine, heating while stirring, heating to 75 ℃, reacting for 30min, adding 0.015Kg of triethylamine, and reacting for 20min to obtain a mixture;
2) weighing 0.2Kg of urea-formaldehyde resin, 0.075Kg of water absorbent and 0.25Kg of polyacrylic acid, and uniformly mixing with the mixture prepared in the step 1), heating to 95 ℃, and stirring for 10min to obtain melamine glue solution.
In the preparation example, the water absorbent is prepared from sodium alginate, anhydrous copper sulfate, polyvinyl alcohol and water in a weight ratio of 5: 1: 10: 10.
Preparation example 2
The melamine glue solution is prepared by the following method:
1) weighing 0.4Kg of 25 percent by mass of formaldehyde aqueous solution and 0.25Kg of 15 percent by mass of citric acid solution, uniformly mixing, adding 0.6Kg of melamine, heating while stirring, heating to 77 ℃, reacting for 35min, adding 0.01Kg of triethylamine, and reacting for 20min to obtain a mixture;
2) weighing 0.25Kg of urea-formaldehyde resin, 0.05Kg of water absorbent and 0.2Kg of polyacrylic acid, and uniformly mixing with the mixture prepared in the step 1), heating to 100 ℃, and stirring for 15min to obtain melamine glue solution.
In the preparation example, the water absorbent is prepared from sodium alginate, anhydrous copper sulfate, polyvinyl alcohol and water in a weight ratio of 7: 4: 13: 10.
Preparation example 3
The melamine glue solution is prepared by the following method:
1) weighing 0.6Kg of formaldehyde aqueous solution with the mass fraction of 30% and 0.3Kg of citric acid solution with the mass fraction of 20%, uniformly mixing, adding 0.7Kg of melamine, heating while stirring, heating to 80 ℃, reacting for 40min, adding 0.02Kg of triethylamine, and reacting for 40min to obtain a mixture;
2) weighing 0.3Kg of urea-formaldehyde resin, 0.1Kg of water absorbent and 0.2Kg of polyacrylic acid, and uniformly mixing with the mixture prepared in the step 1), heating to 105 ℃, and stirring for 20min to obtain melamine glue solution.
In the preparation example, the water absorbent is prepared from sodium alginate, anhydrous copper sulfate, polyvinyl alcohol and water according to the weight ratio of 10: 6: 15: 10.
The kinds and amounts of the raw materials in preparation examples 1 to 3 are shown in table 1:
TABLE 1 kinds and amounts of respective raw materials in preparation examples 1 to 3
Figure BDA0003645963860000091
Preparation of comparative example 1
The melamine glue solution is different from the melamine glue solution in the comparative preparation example 1 in that: sodium alginate was replaced with an equal amount of polyvinyl alcohol, and the remaining parameters and amounts were consistent with comparative example 1.
Preparation of comparative example 2
The melamine glue solution is different from the melamine glue solution in the comparative preparation example 1 in that: the anhydrous copper sulfate was replaced with an equal amount of polyvinyl alcohol, and the remaining parameters and amounts were the same as in comparative example 1.
Examples
The hot melt adhesive used in the application is an EVA hot melt adhesive; the original paper used in the application is purchased from Hao Xinjiang Heyi paper industry Co., Ltd, Dongguan city, and the product number is JN 0407871092; the PET high temperature tape used in this application is transparent.
Example 1
A composite board with a bending structure is prepared by the following steps:
s1, pressing the plywood layer and the melamine impregnated paper layer 2 into a board in a hot pressing mode, wherein the pressing temperature is 140 ℃, attaching the PET high-temperature adhesive tape to the melamine impregnated paper layer 2, and opening a bending groove 4 at the bending position of the board by a grooving process for the board with the PET high-temperature adhesive tape;
s2, injecting distilled water into the bending groove 4, soaking for 60min, airing, and testing the humidity of the bent part of the plate by using a moisture meter until the humidity is 18%;
s3, injecting the molten hot melt adhesive into the bending groove 4, wherein the melting temperature of the hot melt adhesive is 140 ℃, and then bending the hot melt adhesive at a bending angle of 90 degrees to obtain the plate with the bending structure.
Example 2
The composite board with the bending structure is different from the composite board in the embodiment 1 in that the impregnating solution is an alkali solution and is soaked for 20min, and the rest of materials and steps are the same as those in the embodiment 1.
The soaking solution is prepared from 0.1Kg of phosphate and 0.2Kg of distilled water, wherein the phosphate is prepared by mixing 0.033Kg of potassium tripolyphosphate, 0.033Kg of sodium pyrophosphate, 0.0133Kg of tetrapotassium pyrophosphate, 0.007Kg of sodium hexametaphosphate, 0.007Kg of dipotassium hydrogen phosphate and 0.007Kg of potassium dihydrogen phosphate.
Example 3
A composite board with a bending structure is prepared by the following steps:
s1, pressing the density board layer and the melamine impregnated paper layer 2 into a board in a hot pressing mode, wherein the pressing temperature is 140 ℃, attaching the PET high-temperature adhesive tape to the melamine impregnated paper layer 2, and opening a bending groove 4 at the bending position of the board by a grooving process for the board to which the PET high-temperature adhesive tape is attached;
s2, injecting an alkali solution into the bending groove 4, soaking for 10min, cleaning with distilled water until the surface is free of the alkali solution, airing, and testing the humidity of the bending part of the plate by using a moisture tester until the humidity is tested to be 30%;
s3, injecting the molten hot melt adhesive into the bending groove 4, wherein the melting temperature of the hot melt adhesive is 170 ℃, and then bending the hot melt adhesive at a bending angle of 60 degrees to obtain the plate with the bending structure.
The alkali solution is prepared by 0.1Kg of phosphate and 0.3Kg of distilled water, the phosphate is obtained by mixing 0.033Kg of potassium tripolyphosphate, 0.033Kg of sodium pyrophosphate, 0.015Kg of tetrapotassium pyrophosphate, 0.01Kg of sodium hexametaphosphate, 0.01Kg of dipotassium hydrogen phosphate and 0.005Kg of potassium dihydrogen phosphate.
Example 4
A composite board with a bending structure is prepared by the following steps:
s1, pressing the carbon crystal plate layer and the melamine impregnated paper layer 2 into a plate in a hot pressing mode, wherein the pressing temperature is 170 ℃, attaching the PET high-temperature adhesive tape to the melamine impregnated paper layer 2, and opening a bending groove 4 at the bending position of the plate by a grooving process for the plate with the PET high-temperature adhesive tape;
s2, injecting an alkali solution into the bending groove 4, soaking for 300min, cleaning with distilled water until no alkali solution exists on the surface, drying, and testing the humidity of the bent part of the plate by using a moisture meter until the humidity is 40%;
s3, injecting the molten hot melt adhesive into the bending groove 4, wherein the melting temperature of the hot melt adhesive is 210 ℃, and then bending the hot melt adhesive at a bending angle of 30 degrees to obtain the plate with the bending structure.
The alkali solution is prepared from 0.1Kg of phosphate and 0.5Kg of distilled water, wherein the phosphate is obtained by mixing 0.028Kg of potassium tripolyphosphate, 0.028Kg of sodium pyrophosphate, 0.016Kg of tetrapotassium pyrophosphate, 0.012Kg of sodium hexametaphosphate, 0.012Kg of dipotassium hydrogen phosphate and 0.004Kg of monopotassium phosphate.
Example 5
A composite board with a bending structure is prepared by the following steps:
s1, pressing the moisture-proof board layer and the melamine impregnated paper layer 2 into a board in a hot pressing mode, wherein the pressing temperature is 150 ℃, attaching the PET high-temperature adhesive tape to the melamine impregnated paper layer 2, and opening a bending groove 4 at the bending position of the board by a grooving process for the board with the PET high-temperature adhesive tape;
s2, injecting an alkali solution into the bending tank 4, soaking for 120min, cleaning the bending tank with distilled water until the surface of the bending tank is free of the alkali solution, airing, and testing the humidity of the board by using a moisture tester until the humidity is 25%;
and S3, injecting the molten hot melt adhesive into the bending groove 4, wherein the melting temperature of the hot melt adhesive is 190 ℃, and then bending the hot melt adhesive at a bending angle of 45 degrees to obtain the plate with the bending structure.
The alkali solution in step S1 is prepared from 0.1Kg of phosphate and 0.5Kg of distilled water, wherein the phosphate is obtained by mixing 0.028Kg of potassium tripolyphosphate, 0.028Kg of sodium pyrophosphate, 0.016Kg of tetrapotassium pyrophosphate, 0.012Kg of sodium hexametaphosphate, 0.012Kg of dipotassium hydrogen phosphate and 0.004Kg of potassium dihydrogen phosphate.
Example 6
The composite board with the bending structure is different from the composite board in embodiment 2 in that:
s1, completely soaking the base paper in the melamine glue solution from preparation example 1 for 10min, drying for the first time at 95 ℃ until the surface does not flow, then passing the dried impregnated paper through two glue rollers, gluing the upper and lower surfaces of the impregnated paper dried for the first time, and coating the wet amount of the glue at 20g/cm 2 Drying for the second time at the temperature of 100 ℃ to obtain a melamine impregnated paper layer 2;
the remaining steps and parameters were in accordance with example 2.
Example 7
The composite board with the bending structure is different from the composite board in embodiment 3 in that:
s1, completely soaking the base paper in the melamine glue solution from the preparation example 2 for 15min, drying for the first time at 97 ℃ until the surface does not flow, then passing the dried impregnated paper through two glue rollers, gluing the upper and lower surfaces of the impregnated paper dried for the first time, coating the wet amount of the impregnated paper to be 25g/cm2, and drying for the second time at 105 ℃ to obtain a melamine impregnated paper layer 2;
the remaining steps and parameters were in accordance with example 3.
Example 8
A plate with a bending structure is different from the plate in embodiment 4 in that:
s1, completely soaking the base paper in the melamine glue solution from preparation example 3 for 10min, drying for the first time at 95 ℃ until the surface does not flow, then passing the dried impregnated paper through two glue rollers, gluing the upper and lower surfaces of the impregnated paper dried for the first time, coating the wet amount of the impregnated paper to be 30g/cm2, and drying for the second time at 110 ℃ to obtain a melamine impregnated paper layer 2;
the remaining steps and parameters were in accordance with example 4.
The test parameters in each step of examples 1 to 8 are shown in Table 2:
TABLE 2 test parameters in each of the steps of examples 1-8
Figure BDA0003645963860000121
Figure BDA0003645963860000131
Comparative example
Comparative example 1
The composite board with the bending structure is different from the composite board in embodiment 2 in that: the remaining steps and parameters were identical to those of example 2 without passing through step S2.
Comparative example 2
The composite board with the bending structure is different from the composite board in embodiment 2 in that: the plate was soaked with 10% by weight hydrochloric acid solution, and the remaining steps and parameters were in accordance with example 2.
Comparative example 3
The composite board with the bending structure is different from the composite board in embodiment 2 in that: the step of injecting the molten hot melt into the bending groove 4 is omitted in step S3, and the rest of the steps and parameters are the same as those of example 2.
Comparative example 4
The composite board with the bending structure is different from the composite board in embodiment 2 in that: after soaking, the mixture was dried, and the measured humidity was 8%, and the remaining steps and parameters were the same as those in example 2.
Comparative example 5 a composite board with a bent structure, which is different from example 2 in that: after soaking, the mixture was dried, and the humidity was measured to be 60%, and the other steps and parameters were the same as those in example 2.
Performance test
The plate materials with a bent structure obtained in examples 1 to 8 and comparative examples 1 to 4 were subjected to a drying resistance test and a peel strength test.
Test methods/test methods the appearance was observed: after bending by a bending machine, whether the melamine impregnated paper layer 2 cracks or not is observed, and if the melamine impregnated paper layer 2 cracks, a drying resistance test and a peeling strength test are not used.
Drying resistance test: the panels of examples 1-8 were cut into 2cm by 10cm size panels, divided into 2 batches, one for the dry resistance test and one for the peel strength test, with 5 panels in each example of each batch, as was done in comparative examples 1-5. Placing the plate in a constant-temperature constant-humidity incubator, setting the temperature at 60 ℃ and the humidity at 25%, spraying water every 2 days, spraying the water on the surface of the plate, spraying 3g of water every time, standing for 8 days, observing whether the surface of the plate cracks or bubbles after 8 days, measuring the humidity in the plate, and taking an average value.
Peel strength test: the sheets obtained in examples 1 to 8 and comparative examples 1 to 5 were cut into 2cm by 10cm sheets, the melamine-impregnated paper layer 2 and the sheet layer 1 were separated by a knife at the junction of the melamine-impregnated paper layer 2 and the sheet layer 1 along the width of the sheet, the depth of the cut was 1cm, the sheets were separated by an electron peel tester, and the tensile force at the time of separation was recorded and averaged.
Similarly, the plate subjected to the drying resistance test was also subjected to the peel strength test.
The test data are shown in table 3:
table 3 performance testing experimental data
Figure BDA0003645963860000141
Figure BDA0003645963860000151
By combining the examples 1 to 8 and the comparative examples 1 to 5 with table 4, it can be seen that no cracking phenomenon occurs during bending in the examples 1 to 8, and no cracking or foaming phenomenon occurs after a drying test, which indicates that the preparation process can reduce the cracking phenomenon of the sheet material during bending, and can also reduce the cracking phenomenon of the sheet material during use under a drying condition.
Example 2 shows that the plate material without the immersion treatment is easily cracked when bent and that the plate material after immersion is not cracked when bent, as compared with comparative example 1.
Example 2 shows that the plate soaked with the alkali solution is easy to crack when being bent, and the plate soaked with the alkali solution is not easy to crack when being bent, compared with comparative example 2.
Example 2 in comparison with comparative example 3, it is demonstrated that the sheet material into which the molten hot melt adhesive was injected into the bending groove 4 did not crack when bent, while the sheet material into which the molten hot melt adhesive was not injected into the bending groove 4 was likely to crack when bent.
The comparison between example 2 and comparative examples 4 and 5 shows that the humidity of the board is 18-40%, the drying resistance of the board is good, the board does not crack after long-time drying, and the bonding strength between the melamine impregnated paper layer 2 and the board is good.
Compared with example 5 and example 2 and example 6, and compared with example 3 and example 7, the example 2 and example 7 illustrate that the melamine impregnated paper layer 2 prepared by using the melamine glue solution prepared in the application can improve the water storage capacity of the board, reduce the volatilization of the moisture of the board, and improve the bonding stability between the melamine impregnated paper layer 2 and the board.
The present embodiment is only for explaining the present application, and it is not limited to the present application, and those skilled in the art can make modifications of the present embodiment without inventive contribution as needed after reading the present specification, but all of them are protected by patent law within the scope of the claims of the present application.

Claims (10)

1. The plate bending process with the bending structure is characterized by comprising the following steps of:
s1, firstly, laminating the board layer and the melamine impregnated paper layer to form a board, adhering the PET high-temperature adhesive tape to the melamine impregnated paper layer, and opening a bending groove at the bending position of the board layer by the grooving process of the board adhered with the PET high-temperature adhesive tape;
s2, injecting the impregnating solution into a bending groove for 10-300 min, drying, and measuring the humidity of the bending part of the melamine impregnated paper layer, wherein the humidity is 18-40%;
s3, injecting the molten hot melt adhesive into a bending groove, and simultaneously performing bending treatment, wherein the bending angle is less than or equal to 90 degrees, so as to obtain a plate with a bending structure;
the immersion liquid in the step S2 is water or an alkali solution, the alkali solution is prepared by mixing phosphate and distilled water according to the weight ratio of 1 (2-5), and the phosphate is prepared from potassium tripolyphosphate, sodium pyrophosphate, tetrapotassium pyrophosphate, sodium hexametaphosphate, dipotassium hydrogen phosphate and potassium dihydrogen phosphate according to the weight ratio of (5-7): (5-7): (2-4): (1-3): (1-3): 1 are mixed to obtain the product.
2. The plate bending process with the bending structure according to claim 1, wherein the bending process comprises the following steps: the melting temperature of the hot melt adhesive is 140-210 ℃.
3. The plate bending process with the bending structure according to claim 1, wherein the bending process comprises the following steps: and the humidity of the bent part of the melamine impregnated paper layer dried in the step S1 is 30-40%.
4. The plate bending process with the bending structure according to claim 3, wherein the bending process comprises the following steps: the melamine impregnated paper layer is prepared by soaking a paper layer in melamine glue solution and drying, wherein the melamine glue solution is prepared from the following raw materials in parts by weight:
50-70 parts of melamine
50-60 parts of formaldehyde water solution with mass fraction of 20-30%
20-30 parts of citric acid solution with mass fraction of 10-20%
1-2 parts of triethylamine
20-30 parts of urea-formaldehyde resin
5-10 parts of water absorbent
20-30 parts of polyacrylic acid.
5. The plate bending process with the bending structure according to claim 4, wherein the bending process comprises the following steps: the melamine glue solution is prepared by the following steps:
1) according to the weight parts, firstly, uniformly mixing 20-30% of formaldehyde aqueous solution and 10-20% of citric acid solution, adding melamine, heating while stirring, heating to 75-80 ℃, reacting for 30-40 min, adding triethylamine, and reacting for 20-40 min to obtain a mixture;
2) uniformly mixing the urea-formaldehyde resin, the water absorbent and the polyacrylic acid with the mixture prepared in the step 1) according to the parts by weight, heating to 95-105 ℃, and stirring for 10-20 min to obtain the melamine glue solution.
6. The plate bending process with the bending structure according to claim 5, wherein the bending process comprises the following steps: each part of the water absorbent is prepared from sodium alginate, anhydrous copper sulfate, polyvinyl alcohol and water according to the weight part ratio of (5-10): (1-5): (10-15) 10.
7. A composite sheet material with a bending structure prepared by the sheet material bending process according to any one of claims 1 to 6, wherein: the composite board comprises a board layer (1), a melamine impregnated paper layer (2) and a PET high-temperature adhesive tape layer (3), wherein the surface of the melamine impregnated paper layer (2) is connected with the surface of the board layer (1), the other surface of the melamine impregnated paper layer (2) is connected with the surface of the PET high-temperature adhesive tape layer (3), a bending groove (4) is formed in the board layer (1), and hot melt adhesive is arranged in the bending groove (5);
the melamine impregnated paper layer (2) is prepared by the bending process of any one of the plates with the bending structure in claims 1-6.
8. The composite board with the bending structure as claimed in claim 7, wherein: the thickness ratio of the melamine impregnated paper layer (2) to the sheet material layer (1) is 1: (2-8).
9. The composite board with the bending structure as claimed in claim 7, wherein: the distance between the bottom of the bending groove (4) and the melamine impregnated paper layer (2) is 0.1-0.8 mm.
10. The composite board with the bending structure as claimed in claim 7, wherein: the board layer (1) is a plywood layer, a density board layer, a carbon crystal board layer or a moisture-proof board layer.
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