3D texture veneer based on impregnated paper veneer and preparation method of 3D texture veneer

Abstract

The invention discloses a 3D texture veneer based on an impregnated paper veneer and a preparation method thereof.The 3D texture veneer is of a five-layer structure and comprises a base material layer, buffer layers are arranged on the upper surface and the lower surface of the base material layer in a press fit mode, a decoration layer is arranged on the tops of the buffer layers, the surface of the 3D texture veneer has a 3D texture effect, the surface texture depth is larger than or equal to 0.25 mm, and the surface texture thickness is larger than or equal to 0.5 mm. The surface wear resistance value is less than 80mg / 100r, the surface scratch resistance is qualified, the formaldehyde emission is ENF grade, and the surface pollution resistance is fifth grade. The buffer layer is innovatively arranged on the ecological board, the buffer veneer which is light and soft and has a smooth and flat surface is used as a base material surface layer, and deeper textures of a steel plate are molded on the buffer veneer; the compression ratio of the base material is reduced, meanwhile, the surface decoration effect of mold pressing 3D deep textures on non-pressure-resistant base materials such as plywood or core-board is achieved, the limitation of an ecological board on texture expression is solved, and therefore the touch sense and the visual effect of real wood can be simulated.

Description

Technical Field

[0001] The present invention relates to the technical field of panels and processing thereof, and in particular to a 3D textured veneer panel based on an impregnated paper veneer and a preparation method thereof. Background Art

[0002] Eco-boards use plywood or blockboard as the base material. Through the impregnated film paper facing technology, they achieve the characteristics of paint-free wear resistance, waterproof and moisture-proof, high temperature resistance and corrosion resistance, meeting the high requirements of modern home decoration and furniture manufacturing for boards. At present, impregnated film paper facing plywood and blockboard have become products created by Chinese manufacturers themselves, and their market share is increasing. However, traditional ecological boards still have limitations in texture performance, and it is difficult to fully simulate the touch and visual effects of real wood. In order to achieve the 3D three-dimensional effect on the surface of the veneer, the current conventional practice in the industry is to use heavy hot presses and deep relief steel plates, and use a direct pasting process to bond the impregnated paper to the substrate with greater pressure to achieve a 3D deep texture effect on the surface. However, due to the high pressure used in this method, the plywood substrate is compressed greatly, and the cost of meeting the nominal thickness is greatly increased. The blockboard substrate is easily crushed and cannot be used. In addition, due to the high overall hardness of plywood, the base material and the impregnated paper cannot be fully fitted together in the deep relief concave part during the lamination process of the deep relief steel plate, resulting in defects such as bright crystals in the impregnated paper after lamination, and a high defective rate of the product. Therefore, due to various factors such as cost, the 3D deep texture veneer panels on the market are mainly pressure-resistant base materials such as particleboard and fiberboard, while ecological boards are mostly shallow texture veneers. Summary of the invention

[0003] In order to solve the defects and shortcomings in the above-mentioned prior art, the present invention provides a 3D texture panel based on impregnated paper veneer and a preparation method thereof, which can use lower pressure to prepare 3D deep texture effect on impregnated film paper veneer plywood and blockboard, achieve the three-dimensional and realistic texture, thereby creating a real wood grain touch and excellent environmental performance.

[0004] In order to solve the above technical problems, the present invention provides the following technical solutions: a 3D textured decorative panel based on impregnated paper veneer, which has a five-layer structure, including a substrate layer, a buffer layer is pressed on the upper and lower surfaces of the substrate layer, and the top of the buffer layer is a decorative layer. The surface of the 3D textured decorative panel has a 3D texture effect, the surface texture depth is ≥0.25mm, the surface wear resistance value is <80mg / 100r, the surface scratch resistance is qualified, the formaldehyde emission is ENF level, and the surface pollution resistance is level five.

[0005] Preferably, the substrate layer is plywood or blockboard, or other artificial board substrates; the buffer layer is a cork veneer with uniform material and fine surface. Using a softer low-density veneer as a buffer layer can buffer the pressure transmitted by the hot press, and at the same time, the deep relief steel plate texture can be presented through the buffer layer veneer, while the degree of fit between the substrate surface and the impregnated paper is improved, solving the curing defects in the deep relief depressions; the decorative layer is digitally printed melamine impregnated film paper, which uses digital printing technology to highly simulate and reproduce the natural texture of precious wood, and at the same time, the embossed steel plate and its texture are synchronously overlapped, so that the ecological board has the real texture of natural wood in both vision and touch.

[0006] The reason why the present invention uses a softer low-density veneer as a buffer layer is to buffer the pressure transmitted by the hot press, so that a deeper texture of the steel plate can be molded on the buffer veneer with only a smaller pressure, thereby reducing the compression rate of the substrate and achieving the surface decoration effect of molding 3D deep textures on non-pressure-resistant substrates such as plywood or blockboard. It should be noted that other lightweight, low-density materials with relevant properties can also be used as buffer layers.

[0007] A method for preparing a 3D textured veneer panel based on an impregnated paper veneer comprises the following steps:

[0008] S1. Pasting the buffer layer: The substrate is glued by a glue coating machine, and the adhesive is evenly coated on the surface of the substrate by roller coating or spraying. The amount of glue applied is controlled according to the roughness of the substrate surface, and then the buffer veneer is pasted on the upper and lower surfaces of the substrate to obtain a slab;

[0009] S2, cold pressing: the slab is aged for 0-60 minutes before cold pressing begins. The specific ageing time depends on the temperature and humidity. The unit pressure is 0.3-0.5 MPa and maintained for 30-90 minutes.

[0010] S3, hot pressing: sending the cold pressed slab into a hot press, maintaining the temperature at 100-120°C and the unit pressure at 0.4-0.7MPa for 3-8min to obtain a plain plate;

[0011] S4, sanding: the surface of the plain board is finely sanded by a sanding machine, the mesh number of the sanding belt is 180-240 mesh, and the polishing is 75-100m / min;

[0012] S5. Preparation of deep texture impregnated paper: mainly includes the preparation of printed decorative paper and the subsequent dipping process. Through the collection and processing of high-definition texture images of precious wood species, digital printing technology is used to directly print from design files to decorative paper, reducing the intermediate links, achieving high-precision restoration of the design imitation printing of high-end wood species textures, stone patterns, patterns and other personalized colors, perfectly presenting the exquisite effect of the texture to be printed; in the subsequent dipping process, toughening agents are added to the impregnating resin to improve the toughness of the impregnated paper, and the pre-curing degree of the impregnated paper is adjusted to promote the fluidity of the glue during subsequent pressing;

[0013] S6, sticker: place the impregnated paper on the upper and lower surfaces of the plain board, and use a double-sided hot press machine to hot-press the surface with a deep relief steel plate, the molding temperature is 140-160℃, the unit pressure is 2-3MPa, and the pressing time is 2-3min;

[0014] S7, edge guide: remove the melamine paper that is wider than the substrate format to ensure consistent size.

[0015] Preferably, the adhesive in step S1 is water-based formaldehyde-free adhesive, and the adhesive ratio is as follows: original adhesive: flour = 100: (30-40), and the amount of adhesive is controlled at (180-280) g / m 2 between.

[0016] Preferably, the buffer veneer in step S1 is preferably a whole sheet of Ayous veneer, which is a good material and is often used as the bottom plate of table tennis rackets due to its characteristics. It is worth noting that other light-weight, low-density materials with relevant properties can also be used as buffer layers.

[0017] The present invention uses a light and soft material to stick on the surface of the substrate as a buffer layer, and concentrates the hot pressing pressure on the buffer layer, so that the deep-textured steel plate can be pressed with a relatively low pressure, and the deeper texture of the steel plate can be molded on the buffer veneer, thereby reducing the compression rate of the substrate and achieving the surface decoration effect of molded 3D deep texture on non-pressure-resistant substrates such as plywood or blockboard, thereby solving the limitations of ecological boards in texture expression, thereby simulating the touch and visual effect of real wood.

[0018] The sticker of the present invention adopts a synchronous grain matching process to accurately position the impregnated paper on the upper and lower surfaces of the plate, so as to achieve synchronization between the pattern of the impregnated paper and the grain of the embossed steel plate, the depth of the deep embossed steel plate grain is not less than 0.25 mm, and is formed in one step by a double-sided hot press, the molding temperature is 140-160° C., the unit pressure is 2-3 MPa, and the pressing is performed for 2-3 minutes.

[0019] Preferably, in step 2, the slab is left to stand for 10-30 minutes before cold pressing begins, and the unit pressure of the cold press is 0.3-0.4 MPa and maintained for 30-50 minutes.

[0020] Preferably, the hot pressing process in step 3 is as follows: the hot pressing temperature is set at 100-105° C., the unit pressure is 0.4 MPa, and the hot pressing time is 3-4 min.

[0021] Preferably, the plain board in step 4 is filled with putty before sanding to make its surface smooth without depressions or cracks, so as to improve the surface quality of the board and ensure the smoothness of the board surface.

[0022] Preferably, a toughening agent is added during the impregnation of the impregnated paper in step 5 to increase the toughness of the paper and prevent the paper from breaking when pressed against a deeper texture; the pre-curing degree of the impregnated paper is reduced to 30%-40% to improve the fluidity of the glue during hot pressing and avoid curing defects; the impregnated paper needs to be precisely positioned to achieve synchronization between the impregnated paper pattern and the embossed steel plate texture, and the depth of the deep embossed steel plate texture is not less than 0.25 mm.

[0023] Preferably, the hot pressing process temperature in step 5 is 140-150° C., the unit pressure is 2 MPa, and the hot pressing is 3 minutes. During the hot pressing, the impregnated paper and the steel plate are ensured to be synchronized in color to improve the texture 3D effect; the substrate is an ENF grade plywood or blockboard substrate.

[0024] Compared with the prior art, the present invention has the following beneficial effects:

[0025] 1. The present invention innovatively sets a buffer layer on the ecological board and selects a light, soft, smooth and flat buffer veneer as the substrate surface layer. When the board is subjected to 3D deep texture molding, only a small pressure needs to be transmitted to the buffer layer, and a deeper texture of the steel plate is molded on the buffer veneer, thereby reducing the compression rate of the substrate and achieving the surface decoration effect of molded 3D deep texture on non-pressure-resistant substrates such as plywood or blockboard, thereby solving the limitations of the ecological board in texture expression, thereby simulating the touch and visual effect of real wood.

[0026] 2. The finishing layer of the present invention combines digital printing technology with synchronous grain matching technology. The grain direction of the board surface is consistent with the deeper concave-convex feeling, and its texture is consistent with the original wood grain. Especially under the reflection of light, the texture of the board surface is extremely real in touch and vision, and the texture can be comparable to the effect of solid wood, thereby alleviating the shortage of precious wood resources;

[0027] 3. The present invention adopts a one-time forming method, and the double-sided plain board is pressed simultaneously, which reduces the compression of the base material and avoids damage to the surface. The preparation method is simple and efficient, and no major adjustments are made on the basis of the existing ecological board process. The original production line can be used for preparation. Compared with other processes, it has low investment, good stability, and is easy to promote and apply in industrialization. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a structural schematic diagram of the present invention;

[0029] Among them: 1. Base material layer; 2. Buffer layer; 3. Decorative layer. DETAILED DESCRIPTION

[0030] The specific implementation modes of the present invention will be further described in detail below in conjunction with the accompanying drawings, but this does not limit the protection scope of the present invention.

[0031] Example 1

[0032] like Figure 1 As shown, a 3D textured decorative panel based on an impregnated paper veneer has a five-layer structure, including a substrate layer 1, a buffer layer 2 is laminated on the upper and lower surfaces of the substrate layer, and a decorative layer 3 is formed on the top of the buffer layer 2.

[0033] The substrate layer 1 is plywood or blockboard, or other artificial board substrates; the buffer layer is a cork veneer with uniform material and fine surface. The use of a softer low-density veneer as a buffer layer can buffer the pressure transmitted by the hot press, and at the same time, the deep relief steel plate texture is presented through the buffer layer veneer, while the degree of fit between the substrate surface and the impregnated paper is improved, solving the curing defects in the deep relief depressions; the decorative layer is digitally printed melamine impregnated film paper, which uses digital printing technology to perform high-simulation replication and reproduction of the natural texture of precious wood, and at the same time, the embossed steel plate and its texture are synchronously overlapped, so that the ecological board has the real texture of natural wood in both vision and touch.

[0034] Example 2

[0035] A method for preparing a 3D textured veneer panel based on an impregnated paper veneer comprises the following steps:

[0036] S1. Paste the buffer layer: Apply glue to the plywood substrate through a glue coating machine, and evenly apply the adhesive on the surface of the substrate by roller coating or spraying. The amount of glue applied is 200g / m 2 , and then affixing the AYUS veneer to the upper and lower surfaces of the substrate to obtain a slab;

[0037] S2, cold pressing: after aging the slab for 30 minutes, cold pressing begins, with a unit pressure of 0.4 MPa maintained for 40 minutes;

[0038] S3, hot pressing: the cold pressed slab is sent to a hot press, and maintained at a temperature of 100-105°C and a unit pressure of 0.7 MPa for 4 minutes to obtain a plain plate;

[0039] S4, sanding: the surface of the plain board is finely sanded by a sanding machine, the mesh number of the sanding belt is 240 mesh, and the polishing is 80m / min;

[0040] S5. Preparation of deep texture impregnated paper:

[0041] S6, sticker: place the impregnated paper on the upper and lower surfaces of the plain board, and use a double-sided hot press machine to hot-press the surface with a deep relief steel plate, the molding temperature is 150℃, the unit pressure is 3MPa, and the pressing time is 2min;

[0042] S7, edge guide: remove the melamine paper that is wider than the substrate format to ensure consistent size.

[0043] Example 3

[0044] A method for preparing a 3D textured veneer based on an impregnated paper veneer comprises the following steps:

[0045] S1. Paste the buffer layer: Apply glue to the blockboard substrate through a glue coating machine, and evenly apply the adhesive on the surface of the substrate by roller coating or spraying. The amount of glue is 230g / m 2 , and then affixing the AYUS veneer to the upper and lower surfaces of the substrate to obtain a slab;

[0046] S2, cold pressing: after the slab is aged for 30 minutes, cold pressing is started, and a unit pressure of 0.3 MPa is used to maintain the pressure for 40 minutes;

[0047] S3, hot pressing: the cold pressed slab is sent to a hot press, and maintained at a temperature of 100-105°C and a unit pressure of 0.7 MPa for 4 minutes to obtain a plain plate;

[0048] S4, sanding: the surface of the plain board is finely sanded by a sanding machine, the mesh number of the sanding belt is 240 mesh, and the polishing is 80m / min;

[0049] S5. Preparation of deep texture impregnated paper:

[0050] S6, sticker: place the impregnated paper on the upper and lower surfaces of the plain board, and use a double-sided hot press machine to hot-press the surface with a deep relief steel plate, the molding temperature is 140℃, the unit pressure is 2MPa, and the pressing time is 3min;

[0051] S7, edge guide: remove the melamine paper that is wider than the substrate format to ensure consistent size.

[0052] Comparative Example

[0053] A method for preparing an impregnated paper facing ecological board comprises the following steps:

[0054] S1. Sanding of substrate: Use a sanding machine to sand the surface of the plywood substrate, the mesh number of the sanding belt is 150-180 mesh, and the sanding speed is 90m / min;

[0055] S2, sticker: directly paste the impregnated paper on the surface of the substrate, using ordinary light-textured steel plate, molding temperature 130℃, unit pressure 0.7MPa, pressing for 7min / side;

[0056] S3, edge guide: remove the melamine paper that is wider than the substrate format to ensure consistent size.

[0057] The difference between this comparative example and Examples 2 and 3 is that the substrate has no buffer layer, and it is impossible to use a large pressure to mold the deep texture steel plate; secondly, the impregnated paper is a conventional direct-attached impregnated paper, the paper is brittle, and the pre-curing degree is greater than 40%, which cannot meet the requirements of deep texture steel plate pressing. According to the standard GB / T 34722-2017, the following are the physical and chemical performance test results:

[0058]

[0059]

[0060] Although specific embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit thereof, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A 3D textured veneer based on an impregnated paper veneer, characterized in that: The 3D textured decorative panel has a five-layer structure, including a base material layer. A buffer layer is pressed onto the upper and lower surfaces of the base material layer. The top of the buffer layer is a decorative layer. The surface of the 3D textured decorative panel has a 3D texture effect, the surface texture depth is ≥0.25mm, the surface wear resistance value is <80mg / 100r, the surface scratch resistance is qualified, the formaldehyde emission is ENF level, and the surface pollution resistance is level five.

2. The 3D textured veneer panel based on impregnated paper veneer according to claim 1, characterized in that: The substrate layer is plywood or blockboard, or other artificial board substrates; the buffer layer is a cork veneer with uniform material and fine surface. The use of a softer low-density veneer as a buffer layer can buffer the pressure transmitted by the hot press, and at the same time, the deep relief steel plate texture is presented through the buffer layer veneer, while the degree of fit between the substrate surface and the impregnated paper is improved, solving the curing defects in the deep relief depressions; the decorative layer is digitally printed melamine impregnated film paper, which uses digital printing technology to perform high-simulation replication and reproduction of the natural texture of precious wood, and at the same time, the embossed steel plate and its texture coincide synchronously, so that the ecological board has the real texture of natural wood in both vision and touch.

3. A method for preparing a 3D textured veneer panel based on an impregnated paper veneer according to claim 2, characterized in that: The following steps are involved: S1. Pasting the buffer layer: The substrate is glued by a glue coating machine, and the adhesive is evenly coated on the surface of the substrate by roller coating or spraying. The amount of glue applied is controlled according to the roughness of the substrate surface, and then the buffer veneer is pasted on the upper and lower surfaces of the substrate to obtain a slab; S2, cold pressing: the slab is aged for 0-60 minutes before cold pressing begins. The specific ageing time depends on the temperature and humidity. The unit pressure is 0.3-0.5 MPa and maintained for 30-90 minutes. S3, hot pressing: sending the cold pressed slab into a hot press, maintaining the temperature at 100-120°C and the unit pressure at 0.4-0.7MPa for 3-8min to obtain a plain plate; S4, sanding: the surface of the plain board is finely sanded by a sanding machine, the mesh number of the sanding belt is 180-240 mesh, and the polishing is 75-100m / min; S5. Preparation of deep texture impregnated paper: mainly includes the preparation of printed decorative paper and the subsequent dipping process. Through the collection and processing of high-definition texture images of precious wood species, digital printing technology is used to directly print from design files to decorative paper, reducing the intermediate links, achieving high-precision restoration of the design imitation printing of high-end wood species textures, stone patterns, and patterns, perfectly presenting the exquisite effect of the texture to be printed; in the subsequent dipping process, toughening agents are added to the impregnating resin to improve the toughness of the impregnated paper, and the pre-curing degree of the impregnated paper is adjusted to promote the fluidity of the glue during subsequent pressing; S6, sticker: place the impregnated paper on the upper and lower surfaces of the plain board, and use a double-sided hot press machine to hot-press the surface with a deep relief steel plate, the molding temperature is 140-160℃, the unit pressure is 2-3MPa, and the pressing time is 2-3min; S7, edge guide: remove the melamine paper that is wider than the substrate format to ensure consistent size.

4. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: The adhesive in step S1 is a water-based formaldehyde-free adhesive, and the adhesive ratio is as follows: original adhesive: flour = 100: (30-40), and the amount of adhesive is controlled at (180-280) g / m 2 between.

5. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: The buffer veneer described in step S1 is preferably a whole sheet of Ayous veneer, which is a good material and is often used as the bottom plate of table tennis rackets due to its characteristics. It is worth noting that other light-weight, low-density materials with relevant characteristics can also be used as the buffer layer.

6. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: In step 2, the slab is left to stand for 10-30 minutes before cold pressing begins, and the unit pressure of the cold press is 0.3-0.4 MPa and maintained for 30-50 minutes.

7. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: The hot pressing process in step 3 is as follows: the hot pressing temperature is set to 100-105° C., the unit pressure is 0.4 MPa, and the hot pressing time is 3-4 min.

8. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: In step 4, the plain board is filled with putty before sanding to make its surface smooth without dents or cracks, so as to improve the surface quality of the board and ensure the flatness of the board surface.

9. The 3D textured veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: In step 5, a toughening agent is added during the impregnation of the impregnated paper to increase the toughness of the paper and prevent the paper from breaking when pressing a deeper texture; the pre-curing degree of the impregnated paper is reduced to 30%-40% to improve the fluidity of the glue during hot pressing and avoid curing defects; the impregnated paper needs to be placed in a precise position to achieve synchronization between the impregnated paper pattern and the embossed steel plate texture, and the depth of the deep embossed steel plate texture is not less than 0.25 mm.

10. The 3D texture veneer processing technology based on impregnated paper veneer according to claim 3 is characterized by: The hot pressing process temperature in step 5 is 140-150° C., the unit pressure is 2 MPa, and the hot pressing is 3 minutes. During the hot pressing, the impregnated paper and the steel plate are ensured to be synchronized in color to improve the texture 3D effect; the substrate is an ENF grade plywood or blockboard substrate.

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