CN110666904A - Cracking-resistant ecological plate and production process thereof - Google Patents
Cracking-resistant ecological plate and production process thereof Download PDFInfo
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- CN110666904A CN110666904A CN201910918037.5A CN201910918037A CN110666904A CN 110666904 A CN110666904 A CN 110666904A CN 201910918037 A CN201910918037 A CN 201910918037A CN 110666904 A CN110666904 A CN 110666904A
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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
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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
- B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
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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
- B27D5/00—Other working of veneer or plywood specially adapted to veneer or plywood
- B27D5/006—Trimming, chamfering or bevelling edgings, e.g. lists
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Abstract
The invention provides a crack-resistant ecological plate and a production process thereof, wherein the production process comprises the following steps: step 1, coating formaldehyde-free soybean glue on the side surface of a core plate batten, assembling, and carrying out hot pressing to obtain a core plate; step 2, coating aldehyde-free soybean glue on the two sides of a core plate, assembling the middle plates on the front side and the back side of the core plate into 1 layer respectively, and enabling the grain of the core plate to be vertical to the grain of the middle plate; step 3, carrying out cold pressing on the assembled plate, and then carrying out hot pressing on the assembled plate to obtain a substrate; step 4, performing greasing and sanding treatment on the substrate in the step 3, then coating aldehyde-free soybean glue on the two sides of the substrate, and forming blank wood skin layers on the front side and the back side of the substrate; step 5, carrying out hot pressing on the assembled plate after cold pressing; step 6, performing greasing, edge cutting and sanding treatment on the semi-finished product in the step 5; and 7, sequentially assembling the front side and the back side of the semi-finished product obtained in the step 6, dipping the cracking-resistant layer and the melamine dipped adhesive film paper, and carrying out a hot pressing process, wherein the cracking-resistant layer is resistant to isotropic materials.
Description
Technical Field
The invention belongs to the field of plate manufacturing, and particularly relates to a crack-resistant ecological plate and a production process thereof.
Background
With the development of times, the multifunctional board has completely exposed corners on the market. The ecological board, also called melamine impregnated bond paper veneer artificial board, is a decorative board made by laying bond paper impregnated with amino resin on a plywood or a joinery board base material and hot-pressing. The ecological plate has the advantages of high temperature resistance, acid and alkali resistance, moisture resistance, fire resistance and the like, and is popular with consumers.
Impregnated paper faced plywood and core-board are prone to surface cracking when used in the northern environment, and cannot be sold in the northern market. The national standard requires that the crack resistance of the surface of the ecological plate reaches more than 4 grades, but the products of most manufacturers can not meet the performance requirement so far.
Therefore, the cracking resistance is always a difficult problem to break through in the plate manufacturing industry. For example, patent application No. 201710254261.X, entitled "a crack-resistant multifunctional impregnated bond paper veneer artificial board and manufacturing method thereof", provides a method which is tedious in production, high in production cost and not suitable for factory production.
Disclosure of Invention
In order to solve the defects, the invention provides a production process of a crack-resistant ecological plate, which comprises the following steps:
step 1, coating formaldehyde-free soybean glue on the side surface of a core plate batten, assembling, and carrying out hot pressing to obtain a core plate;
step 2, coating aldehyde-free soybean glue on the two sides of a core plate, assembling the middle plates on the front side and the back side of the core plate into 1 layer respectively, and enabling the grain of the core plate to be vertical to the grain of the middle plate;
step 3, carrying out cold pressing on the assembled plate, and then carrying out hot pressing on the assembled plate to obtain a substrate;
step 4, performing greasing and sanding treatment on the substrate in the step 3, then coating aldehyde-free soybean glue on the two sides of the substrate, and forming blank wood skin layers on the front side and the back side of the substrate;
step 5, carrying out hot pressing on the assembled plate after cold pressing; step 6, performing greasing, edge cutting and sanding treatment on the semi-finished product in the step 5;
and 7, sequentially assembling the front side and the back side of the semi-finished product obtained in the step 6, dipping the cracking-resistant layer and the melamine dipped adhesive film paper, and carrying out a hot pressing process, wherein the cracking-resistant layer is resistant to isotropic materials.
The ecological plate has poor cracking resistance, the main reason is the anisotropy of the veneer layer, and particularly in the dry environment in the north, the veneer is shrunk to cause the cracking of the plate surface; the principle of the invention is to add a layer of isotropic material on the veneer layer to solve the problem of cracking of the board surface.
In some embodiments of the invention, the impregnated crack resistant layer is selected from impregnated kraft paper, impregnated non-woven fabric, impregnated fiberglass fabric.
The invention further provides a method for toughening and modifying melamine resin used in a crack-resistant layer, and further improves the crack-resistant performance of an ecological board, so that the problem that the crack-resistant performance is improved by modifying the adhesive used for impregnating an adhesive film paper layer is solved, and the method has the advantages that: (1) the excellent performances of the surface layer dipped glue film paper layer, especially the scratch resistance and the cigarette burning resistance, are reserved; (2) the influence of the toughening agent on the appearance performance such as surface texture, color and the like is avoided; specifically, in some embodiments of the present invention, the dipping glue used for dipping the crack-resistant layer is a modified melamine adhesive; preferably, the modified melamine adhesive is: adding a toughening agent into a melamine adhesive, wherein the toughening agent is selected from one or more of polyvinyl acetate emulsion, carboxylic styrene-butadiene emulsion, styrene-acrylic emulsion, polyethylene-vinyl acetate emulsion and polyvinyl alcohol solution; more preferably, the toughening agent is added in a mass ratio of 3% to 5%.
In some embodiments of the invention, the base paper of kraft paper, non-woven fabric or glass fiber cloth has a basis weight of 140g/m2The gum dipping amount is 120-130%.
In some embodiments of the present invention, the wood used for the core board is fir, poplar, pine, tung, nanmu, rubber wood, or malachite wood, and the thickness of the wood is 1.0cm to 1.3 cm.
In some embodiments of the present invention, the wood used for the middle plate is poplar wood or eucalyptus wood, and the thickness of the middle plate is 2.4mm to 3.2 mm.
In some embodiments of the present invention, the wood veneer is made of poplar veneer and technical wood veneer, and the thickness of the wood veneer is 0.5-1.0 mm.
In some embodiments of the present invention, the amount of the substrate front and back surface in step 4 is at least 1.4 ± 0.1 kg/sheet; preferably 1.4 + -0.1 kg-1.8 + -0.1 kg/sheet.
In some embodiments of the present invention, the production process specifically comprises the steps of:
step 1160 ℃, hot pressing for 180s to prepare a core plate; step 3, cold pressing with unit pressure of 0.7MPa for 40-60 min; hot pressing unit pressure of 0.65MPa, time of 17min and temperature of 125 ℃; 5, the unit pressure of cold pressing is 0.6MPa, and the time is 30 min; the hot pressing unit pressure is 0.65MPa, the time is 7min, and the temperature is 125 ℃; and 7, performing a hot pressing process in the step 7, wherein the unit pressure is 0.7MPa, the temperature is 123 ℃, and the time is 7 min.
The crack-resistant ecological board is obtained by the production process provided by the invention.
The invention has the following beneficial effects: 1. the cracking resistance grade is high and reaches 5 grades. (detection according to 4.36 in GB/T17657-2013); 2. the surface bonding strength reaches 1.4-1.8 MPa. (detection according to 4.15 in GB/T17657-2013); 3. the formaldehyde emission is less than or equal to 0.1 mg/L. (detection according to 4.59 in GB/T17657-2013); 4. and the cold and hot resistance cycle test shows that the paint has no defects of cracks, bubbles, discoloration, wrinkling and the like for more than 10 cycles. (detection according to 4.31 in GB/T17657-2013); 5. the production process provided by the invention is convenient and fast, and is suitable for mass production in factories.
Drawings
Fig. 1 is a schematic structural diagram of a crack-resistant ecological plate provided by the invention.
Detailed Description
Example 1
A production process of a crack-resistant ecological plate specifically comprises the following steps:
step 1, coating aldehyde-free soybean glue on the side surface of a core plate batten, wherein the coating weight is 0.7 Kg/gauge plate, assembling, and carrying out hot pressing at 160 ℃ for 180s to obtain a core plate;
step 2, coating aldehyde-free soybean glue on the two sides of the core board, wherein the glue distribution amount is 1.4 +/-0.2 kg/piece, the middle board is assembled into 1 layer on each of the front side and the back side of the core board, and the grain of the core board is vertical to the grain of the middle board;
step 3, carrying out cold pressing on the assembled plate, wherein the unit pressure of the cold pressing is 0.7MPa, the time is 40-60min, and then carrying out hot pressing, the unit pressure of the hot pressing is 0.65MPa, the time is 17min, and the temperature is 125 ℃; obtaining a substrate
Step 4, performing greasing and sanding treatment on the substrate in the step 3, then coating aldehyde-free soybean glue on the two sides of the surface of the substrate, wherein the glue distribution amount is 1.4 +/-0.2 kg/piece, and forming blank wood skins on the front side and the back side of the substrate;
step 5, carrying out hot pressing on the assembled plate after cold pressing, wherein the unit pressure of the cold pressing is 0.6MPa, the time is 30min, the unit pressure of the hot pressing is 0.65MPa, the time is 7min, and the temperature is 125 ℃;
step 6, performing greasing, edge cutting and sanding treatment on the semi-finished product in the step 5;
step 7, sequentially assembling the front and back surfaces of the semi-finished product obtained in the step 6 into impregnated kraft paper and melamine impregnated bond paper, and carrying out hot pressing at the unit pressure of 0.7MPa and the temperature of 123 ℃ for 7 min; the gum dipping amount of the dipped kraft paper is 120 percent;
the impregnated kraft paper is modified melamine impregnated kraft paper, and the specific preparation method of the modified melamine comprises the following steps: adding 4% of polyvinyl acetate emulsion into a melamine adhesive and uniformly stirring;
the use principle of the impregnated kraft paper is as follows: the existing ecological plate has poor crack resistance, the main reason is the anisotropy of the veneer layer, and particularly in the dry environment in the north, the shrinkage of the veneer causes the cracking of the plate surface; the principle of the invention is to add a layer of isotropic material on the veneer layer to solve the problem of cracking of the board surface.
Step 8, checking, packaging and warehousing;
through the production process, the crack-resistant production board is obtained, and specifically as shown in fig. 1, the ecological board sequentially comprises the following components from top to bottom: a front impregnated adhesive film paper layer 10, a front impregnated kraft paper layer 20, a front wood veneer layer 30, a front middle board layer 40, a core board layer 50, a back middle board layer 60, a back wood veneer layer 70, a back impregnated kraft paper 80, and a back impregnated adhesive film paper layer 90;
the front wood skin layer 30 is bonded with the front middle board layer 40 through the formaldehyde-free soybean glue layer 34, the front middle board layer 40 is bonded with the core board layer 50 through the formaldehyde-free soybean glue layer 45, and the core board layer 50 is bonded with the back middle board layer 60 through the formaldehyde-free soybean glue layer 56; the back middle plate layer 60 is bonded with the back wood skin layer 70 through the formaldehyde-free soybean glue layer 67;
in this embodiment, the front impregnated kraft paper is adhesively connected to the front impregnated cellophane paper layer; the back impregnated kraft paper is connected with the back impregnated adhesive film paper layer in an adhesive manner;
the wood used by the core board layer is fir, and the thickness of the wood is 1.2 cm; the wood used by the middle plate layer is poplar, and the thickness of the wood is 2.8 mm; the wood veneer layer is made of poplar veneer, and the thickness of the wood veneer layer is 0.8 mm.
Example 2
Example 2 differs from example 1 in that the material used for the cracking-resistant layer in step 7 is an impregnated nonwoven fabric.
Example 3
The difference between the embodiment 3 and the embodiment 1 is that the process of pressing and pasting the veneer layer is different, glue is distributed on the two sides of the base plate in the step 4, and the glue distribution amount is increased to 1.8 +/-0.1 kg/piece.
Example 4
The difference between the embodiment 4 and the embodiment 1 is that the process of pressing and pasting the veneer layer is different, glue is distributed on the two sides of the base plate in the step 4, and the glue distribution amount is increased to 1.8 +/-0.1 kg/piece; and 7, using a material of the cracking-resistant layer as an impregnated non-woven fabric.
Comparative example 1
Comparative example 1 is different from example 1 in that the melamine-impregnated bond paper was directly laminated on the veneer substrate without laminating the cracking-resistant layer.
Comparative example 2
Comparative example 2 is different from example 1 in that the cracking resistant layer was not laminated and the amount of glue distribution was changed to 1.8 + -0.1 kg/sheet when the wood veneer layer was laminated.
Comparative example 3
Comparative example 3 is different from example 1 in that kraft paper not impregnated with melamine adhesive is used as a material for laminating the crack-resistant layer.
Comparative example 4
Comparative example 4 is different from example 1 in that the material used in the lamination of the crack-resistant layer is a nonwoven fabric which is not impregnated with a melamine adhesive.
Performing related detection on the finished product, wherein the detection results are shown in the following table 1
TABLE 1 statistical table of test data of examples and comparative examples
The detection results in table 1 show that the formaldehyde emission of the finished sample plate is less than or equal to 0.1mg/L, and the sample plate belongs to a green environment-friendly building material. The surface bonding strength reaches 1.4-1.8MPa, and the adhesive has better mechanical property. The results of the crack resistance tests, data and experimental phenomena of the examples reach grade 5, and the crack resistance test shows that the steel plate does not crack after being subjected to more than 10 times of cold and hot cycles and has excellent crack resistance. Comparative example 1, no crack-resistant material was used, so the surface lacked stress resistance, and could not provide toughness for the sheet, the crack-resistant rating was 3, and the sheet cracked after 3 times of the cold and hot cycle test; comparative example 2 does not use a crack-resistant material, but increases the glue application amount of the large skin, and increases certain toughness of the plate by increasing the thickness of the glue layer, but the effect is not improved well, the crack-resistant grade reaches 4 grade, and the plate can crack after 5 times of cold and heat cycle test; comparative examples 3 and 4 use kraft paper and non-woven fabric which are not impregnated with melamine adhesive, the toughness of the board is increased by the kraft paper and the non-woven fabric, the crack resistance is improved, the crack resistance grade reaches 4, but the surface bonding strength is poor, and the board cracks only in 0.7-0.8MPa after being tested for 8 times of cold and hot cycle resistance.
The foregoing shows and describes the general principles, essential features, and advantages of the invention. It will be understood by those skilled in the art that the present invention is not limited to the embodiments described above, which are described in the specification and illustrated only to illustrate the principle of the present invention, but that various changes and modifications may be made therein without departing from the spirit and scope of the present invention, which fall within the scope of the invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (10)
1. The production process of the crack-resistant ecological plate is characterized by comprising the following steps:
step 1, coating formaldehyde-free soybean glue on the side surface of a core plate batten, assembling, and carrying out hot pressing to obtain a core plate;
step 2, coating aldehyde-free soybean glue on the two sides of a core plate, assembling the middle plates on the front side and the back side of the core plate into 1 layer respectively, and enabling the grain of the core plate to be vertical to the grain of the middle plate;
step 3, carrying out cold pressing on the assembled plate, and then carrying out hot pressing on the assembled plate to obtain a substrate;
step 4, performing greasing and sanding treatment on the substrate in the step 3, then coating aldehyde-free soybean glue on the two sides of the substrate, and forming blank wood skin layers on the front side and the back side of the substrate;
step 5, carrying out hot pressing on the assembled plate after cold pressing;
step 6, performing greasing, edge cutting and sanding treatment on the semi-finished product in the step 5;
and 7, sequentially assembling the front side and the back side of the semi-finished product obtained in the step 6, dipping the cracking-resistant layer and the melamine dipped adhesive film paper, and carrying out a hot pressing process, wherein the cracking-resistant layer is resistant to isotropic materials.
2. The process according to claim 1, wherein the impregnated crack-resistant layer is selected from impregnated kraft paper, impregnated non-woven fabric, impregnated fiberglass fabric.
3. The production process according to claim 1, wherein the dipping glue used for dipping the crack-resistant layer is modified melamine adhesive, preferably, the modified melamine adhesive is prepared by adding a toughening agent into melamine adhesive, wherein the toughening agent is one or more selected from polyvinyl acetate emulsion, carboxylic styrene-butadiene emulsion, styrene-acrylic emulsion, polyethylene-vinyl acetate emulsion and polyvinyl alcohol solution, and more preferably, the adding mass proportion of the toughening agent is 3% ~ 5%.
4. The production process as claimed in claim 2, wherein the base paper of kraft paper, non-woven fabric or glass fiber cloth has a basis weight of 140g/m2The gum dipping amount is 120-130%.
5. The production process of claim 2, wherein the wood used for the core board is fir, poplar, pine, tung, nanmu, rubber wood, or malachite wood, and the thickness of the wood is 1.0cm ~ 1.3.3 cm.
6. A crack-resistant ecological board according to claim 1, characterized in that the wood used in the middle board is poplar wood or eucalyptus wood, and the thickness of the board is 2.4mm ~ 3.2.2 mm.
7. The production process according to claim 1, wherein the wood veneer is made of poplar veneer and technical wood veneer, and the thickness of the wood veneer is 0.5 ~ 1.0.0 mm.
8. The production process according to claim 1, wherein the amount of the base board front and back surface adhesive in step 4 is at least 1.4 ± 0.1 kg/sheet, preferably 1.4 ± 0.1kg ~ 1.8 ± 0.1 kg/sheet.
9. The production process according to claim 1, comprising in particular the steps of: step 1160 ℃, hot pressing for 180s to prepare a core plate; step 3, cold pressing with unit pressure of 0.7MPa for 40-60 min; hot pressing unit pressure of 0.65MPa, time of 17min and temperature of 125 ℃; 5, the unit pressure of cold pressing is 0.6MPa, and the time is 30 min; the hot pressing unit pressure is 0.65MPa, the time is 7min, and the temperature is 125 ℃; and 7, performing a hot pressing process in the step 7, wherein the unit pressure is 0.7MPa, the temperature is 123 ℃, and the time is 7 min.
10. Crack-resistant ecological board obtained by the production process according to any one of claims 1 ~ 9.
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| CN111775228A (en) * | 2020-07-22 | 2020-10-16 | 浙江升华云峰新材股份有限公司 | Anti-cracking ecological plate and preparation method thereof |
| CN112356210A (en) * | 2020-07-24 | 2021-02-12 | 江西年轮实业有限公司 | Novel solid wood combined panel and veneering process thereof |
| CN113021537A (en) * | 2021-03-23 | 2021-06-25 | 南京林业大学 | Production process of wood-based paper plywood |
| CN113352710A (en) * | 2021-07-21 | 2021-09-07 | 今创集团股份有限公司 | Composite decorative board for bending deformation |
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Application publication date: 20200110 |
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