A production process for veneer artificial board with precise grain alignment

Abstract

The invention discloses a production process of a precisely aligned veneer artificial board, comprising the following steps: designing and proofing; batch-producing special base paper; printing textures on the special base paper to obtain printed decorative paper; dipping the printed decorative paper in glue, cutting to obtain decorative adhesive film paper; calibrating and hot pressing to obtain the precisely aligned veneer artificial board. The invention designs a specific special base paper, effectively reduces the transverse expansion rate and the longitudinal expansion rate and the difference therebetween, and has good dimensional stability. In subsequent cutting and processing steps of the special base paper, only fine-tuning is required, and processing is convenient. Moreover, the number of times the transverse and longitudinal expansion rates of the base paper are measured by a board processing plant can be reduced to a certain extent, thereby improving production efficiency. At the same time, various production parameters of the entire production line are designed for the special base paper, and the deviation is minimized while ensuring quality, so that the alignment deviation of the synchronously aligned veneer artificial board is ensured to be no more than 1 mm from all links, thereby achieving precisely aligned grains.

Description

Technical Field

[0001] The invention belongs to the technical field of veneer artificial boards, and in particular relates to a production process of veneer artificial boards with precise grain alignment. Background Art

[0002] Synchronous grain matching technology refers to the use of high-definition camera systems and precise positioning instruments to synchronize the texture on the printed wood grain paper with the texture on the steel template. The steel template is pressed onto the impregnated paper to form uneven grooves, that is, simulated wood grain. It has the visual and tactile effects of real wood texture and can partially replace the use of real wood, effectively reducing the cost of making furniture from solid wood or furniture made from solid wood veneer veneer artificial boards.

[0003] The synchronously-grained artificial board has a delicate and lifelike texture, is three-dimensional and vivid, beautiful and elegant, and has a good decorative effect. It not only provides a real convex and concave touch feeling, but also gives people a fashionable experience. It is increasingly favored by designers and consumers. However, during the preparation process, if the steel template texture and the decorative paper texture are not completely aligned before pressing, it will cause a large deviation between the 3D texture groove and the 2D texture on the printed paper, which will greatly affect the visual decorative effect of the synchronously-grained artificial board, and the realism of the simulated wood grain cannot be achieved.

[0004] From the above, it can be seen that accurate grain alignment is particularly important. In order to achieve precise grain alignment, the patent document with application number CN201110085302.X discloses a process for producing impregnated film paper veneered artificial board with a synchronous grain alignment positioning method. This invention is the applicant's prior application. The wood grain texture and grain alignment mark on the impregnated film paper are first engraved on an embossed steel plate, and then the grain alignment mark is engraved on the movable fixture through the embossed steel plate. When pressing the impregnated film paper, it is only necessary to align the impregnated film paper with the grain alignment mark on the movable fixture. In this way, the precise grain alignment of the embossed steel plate and the impregnated film paper can be achieved conveniently and quickly, thereby improving processing efficiency and reducing processing costs.

[0005] In addition, the patent document with application number 202010261829.2 discloses an intelligent double-sided synchronous grain processing method and a computer control system for implementing the method, which uses computer-controlled optical positioning technology to realize automatic judgment and calibration of double-sided synchronous grain. The computer control system includes a high-definition camera system and precise positioning instruments and equipment. The intelligent double-sided synchronous grain processing system includes an image positioning processing system. Based on the first projection mark position and the second projection mark position obtained by the high-definition camera system and the precise positioning instrument and equipment, the overlap degree of the first projection mark position and the second projection mark position is judged. If the overlap degree is greater than a predetermined threshold, the texture on the printed wood grain paper and the texture on the steel template coincide synchronously. The invention is achieved by providing a steel template with three texture layers and using its optical calibration technology, and the judgment effect is fast and accurate.

[0006] It can be seen from the above prior art that in order to achieve accurate alignment, the technicians in this field have focused on the final alignment and pressing step of the steel template and the textured printing paper. However, in fact, there are multiple steps and multiple factors in the early stage that will affect the accuracy of the alignment, such as the control of the horizontal and vertical expansion rate of the base paper, the design of the drying process, the control of the heating expansion rate of the long and short sides of the steel template, etc. If the various parameters are not accurately controlled in the early stage, it may even cause the final alignment mark to be unable to be aligned at all, that is, only focusing on the final alignment and pressing link cannot fundamentally guarantee the accuracy of the synchronous alignment.

[0007] On the other hand, sheet metal processing plants generally need to purchase base paper from base paper mills. After purchasing different batches of base paper, sheet metal processing plants need to conduct new transverse and longitudinal expansion and contraction rate measurements for this batch of base paper, so as to re-determine the printing and dipping processes, which is time-consuming and labor-intensive. At the same time, the existing base paper has large transverse and longitudinal expansion and contraction rates and a large difference in expansion and contraction rates in the two directions, resulting in poor dimensional stability and failure to meet the requirements of precise grain alignment.

[0008] The present application aims to provide a base paper production process with small transverse and longitudinal expansion ratios, small expansion ratio difference in the two directions, and good dimensional stability, and thereby to carry out relatively accurate, clear and convenient process design and parameter setting for the entire production line of patterned artificial boards. Summary of the invention

[0009] In view of the problems in the related art, the present invention proposes a production process for a precisely grained veneer artificial board to overcome the above-mentioned technical problems existing in the existing related art.

[0010] The technical solution of the present invention is achieved in this way:

[0011] A production process for a precisely grained veneer artificial board comprises the following steps:

[0012] (1) Designing and proofing decorative film paper to determine the preparation parameters of the plate roller and the steel template, manufacturing a synchronous grain-aligning printing plate roller and a synchronous grain-aligning steel template, wherein the decorative film paper is provided with a cutting cursor and a pattern-aligning cursor, and the synchronous grain-aligning steel template is provided with a corresponding pattern-aligning cursor;

[0013] (2) Batch production of special base paper;

[0014] (2-1) fully mixing 60-80% by mass of wood pulp, 20-40% by mass of filler and water through a pulping device to prepare a coarse pulp with a mass fraction of 50-60%;

[0015] The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 5.5-6.0:1.0-1.5:0.5-1.0:0.8-1.0;

[0016] The coniferous pulp fiber has a length of 2.8 to 4.2 mm and a width of 42 to 56 µm, the broadleaf pulp fiber has a length of 0.8 to 1.2 mm and a width of 20 to 30 µm, the sea island fiber has a fineness of 0.03 to 0.05 dtex, and the modified glass fiber has a length of 20 to 40 µm and a diameter of 6 to 14 µm;

[0017] (2-2) Adding an auxiliary agent accounting for 2 to 5% by weight of the crude pulp, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 6 to 8% and a beating degree of 28 to 38 0 SR, production slurry with a wet weight of 1.0 to 1.5 g;

[0018] The refiner has a refining disc speed of 20-30 m / s, which rotates at high speed to rub and squeeze the pulp, so that the pulp is evenly mixed, the pulp is more closely combined with each other, and it is conducive to the entanglement of the fibers.

[0019] (2-3) forming the production slurry through a wire pressing section at a slurry speed ratio of 1.0 to 1.5, with a moisture content of 35 to 55%;

[0020] (2-4) treating the material obtained in step (2-3) to a moisture content of 2 to 4%;

[0021] (2-5) performing conventional paper sheet surface treatment and winding to obtain the special base paper having a longitudinal shrinkage of 0.05-0.1%, a transverse shrinkage of 0.1-0.2%, an ash content of 30-40%, an air permeability of 20-35s / 100mL, a smoothness of 220-240s, and a permeability of 3-5s;

[0022] (3) The synchronously aligned texture printing plate roller prints textures on the special base paper to produce printed decorative paper;

[0023] (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper;

[0024] (5) The synchronous alignment steel template is installed on the hot pressing equipment, and the decorative film paper and the artificial board substrate are transported to the assembly hot pressing station. The alignment cursor of the synchronous alignment steel template is aligned with the alignment cursor of the decorative film paper through the camera correction system, and then hot pressing is performed to produce a precisely aligned veneered artificial board.

[0025] The existing base paper generally has large transverse and longitudinal expansion rates and a large difference in expansion rates in the two directions, and poor dimensional stability. Repeated adjustments in subsequent winding, cutting or processing processes are difficult to meet the requirements of precise grain alignment.

[0026] The present invention aims to solve the problem by designing the raw material composition, proportion and process. First, the fiber fineness of the coniferous pulp is relatively fine, and the internal cavity is relatively small, which can improve the resistance of the special base paper to thermal shrinkage and hygroscopic expansion, and improve the dimensional stability of the base paper. However, the base paper uniformity and stiffness of the single coniferous pulp are slightly insufficient. Therefore, it is necessary to mix it with the broadleaf pulp in a specific ratio to ensure the uniformity and stiffness of the special base paper; secondly, the sea island fiber is an ultrafine fiber, which can fill the gaps between the fibers, making the structure of the special base paper denser, while reducing the degree of thermal shrinkage and hygroscopic expansion, and improving the strength of the special base paper; finally, the modified glass fiber can be closely combined with other fibers of the present invention to reduce the moisture inside the fiber, and while reducing the expansion rate of the special base paper, it can also improve its strength;

[0027] According to the specific wood pulp components and proportions of the present invention, the present invention also defines the process parameters such as the beating degree, so that the raw material fibers are interrupted, scattered and fully entangled to make a specific special base paper, effectively reducing the transverse expansion rate and the longitudinal expansion rate and the difference between the two, and having good dimensional stability. In the subsequent cutting and processing of the special base paper, only fine adjustments need to be made, and the processing is convenient, which is conducive to improving production efficiency and reducing the defective rate;

[0028] Each batch of base paper purchased by a sheet metal processing plant needs to have its transverse and longitudinal expansion rates remeasured, and there are large variations between batches. The measurement process also requires additional time and production costs for the sheet metal processing plant. The present invention fully discloses a production method for the special base paper. The transverse and longitudinal expansion rates of the prepared special base paper have a smaller range and are relatively stable. To a certain extent, the number of times the sheet metal processing plant measures the transverse and longitudinal expansion rates of the base paper can be reduced, production efficiency can be improved, and the situation of inaccurate overprinting of textures and cursors can be avoided as much as possible.

[0029] Preferably, in step (1), the synchronous printing plate roller is provided with a base roller, a pre-plating layer, a platemaking copper layer and a chromium layer from the inside to the outside, the thickness of the chromium layer is 9-11µm, the mesh fineness of the synchronous printing plate roller is 180-250 mesh, and the cell depth is 25-35µm, which saves ink, makes the drawing clear, and accurately restores the wood texture color.

[0030] Preferably, in step (1), the texture depth of the synchronously textured steel template is 0.1-0.3 mm, the texture drop does not exceed 0.1 mm, the texture surface is plated with a super-hard chromium layer, the super-hard chromium layer thickness is 20-50 µm, and the surface hardness is 800-1000 HV, ensuring its wear resistance, corrosion resistance, durability and aesthetics;

[0031] After the synchronous graining steel template is heated to a preset hot pressing temperature, the long side expands by 0.16% to 0.20%, and the short side expands by 0.11% to 0.12%. The thermal expansion coefficients of 633 stainless steel and chromium are relatively low. The size change is controlled within a tiny range through the design of the material and the chromium layer, thereby improving the graining accuracy.

[0032] More preferably, the preparation process of the synchronously grained steel template includes: 4 printings, 3 etchings, 2 shot blastings, 1 electrolysis, 1 soft light, forming a concave and convex texture on the surface, and then electroplating, cutting, and punching to make the synchronously grained steel template.

[0033] Specifically, in the printing process, the photosensitive ink used in the inkjet printing has an inkjet volume of 23 to 25 levels, a film exposure time of 30 to 120 seconds, a developing frequency of 23 to 25 Hz, and a printed texture is designed based on the data of the synchronously aligned printing plate roller to ensure that the texture of the decorative paper is consistent with the texture of the synchronously aligned steel template.

[0034] Specifically, in the etching process, the etching solution is a mixture of ferric chloride and hydrochloric acid, the mass concentration of ferric chloride is 700-800 g / L, the amount of hydrochloric acid added is 10-20 mL / L, the etching temperature is 45-50° C., and the etching speed is 10-20 μm / h.

[0035] Specifically, in the shot blasting process, the blasting frequency is 4-5 Hz, and the blasting density is 4-5 g / cm 3 .

[0036] Specifically, in the electrolysis process, the electrolyte is a mixture of phosphoric acid, sulfuric acid and chromic anhydride, the mass ratio of the three is 6.0-7.0:1.0-1.5:0.5-1.0, and the solution density is 1.65-1.75 g / cm 3 , electrolysis temperature 60 ~ 75 ℃, electrolysis time 15 ~ 30min.

[0037] Specifically, in the soft light process, the sandblasting frequency is 3-4 Hz, and the sandblasting density is 10-13 g / cm 3 .

[0038] Specifically, at least two alignment cursors are respectively arranged on both sides of the decorative adhesive film paper and are symmetrically distributed, and at least two alignment cursors are respectively arranged on both sides of the synchronous alignment steel template corresponding to the decorative adhesive film paper and are symmetrically distributed.

[0039] Preferably, in the step (2-1), the filler is kaolin, titanium dioxide and pigment mixed in a mass ratio of 1.0-1.5:1.5-3.0:0.2-0.3;

[0040] In the step (2-2), the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1.

[0041] Preferably, the specific operation of step (2-4) is: drying the material obtained in step (2-3) to a moisture content of 1-2%, and then re-wetting it to a moisture content of 2-4%, so that the moisture content of the special base paper is more evenly balanced, the sensitivity of the special base paper to moisture is reduced, and the dimensional stability and overprinting accuracy of the special base paper are improved.

[0042] Considering that one-time high-temperature drying easily causes deformation and dimensional instability of the special base paper, more preferably, the specific operation of the drying is: drying the material obtained in step (2-3) twice, the first drying temperature is 100-140°C, and the drying time is 4-9S; the second drying temperature is 100-150°C, and the drying time is 2-9S.

[0043] Preferably, in step (3), the special base paper is printed with water-based ink of four color groups by a gravure printing machine, and inking is performed four times from light to dark, with the amount of ink applied to the base color being 1-3% and the amount of ink applied to the printed pattern being 3-8%, and drying is performed after each inking;

[0044] The water-based ink has a fineness of less than 10 μm, a viscosity of 15 to 18 seconds, and a pH value of 8.5 to 9.0;

[0045] The gravure printing machine has a printing speed of 180-200 m / min and a tension of 2-2.5 kg / cm 2 ;

[0046] The overprinting accuracy error of the cutting cursor and the pattern cursor printed in the step (3) does not exceed 0.5 mm, and the effective printing width deviation does not exceed 1 mm.

[0047] More preferably, the specific operations of the four drying steps corresponding to the four inking steps are as follows:

[0048] The first drying temperature is 150-220°C and the drying time is 3-5 seconds;

[0049] The second drying temperature is 150-200°C and the drying time is 5-10 seconds;

[0050] The third drying temperature is 150-200°C and the drying time is 10-15 seconds;

[0051] The fourth drying temperature is 80-180°C and the drying time is 15-20 seconds.

[0052] Preferably, in step (4), the specific operation of dipping the printed decorative paper into glue is:

[0053] (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 0.8-1.2:3.8-4.2 to prepare a mixed glue solution;

[0054] (4-2) The printed decorative paper is immersed in the mixed glue solution, the front and back sides are immersed in glue at a ratio of 2.8-3.2:1.8-2.2, the immersion speed is 25-30 m / min, the tension is 45±0.5N, and then dried, and the temperature rises first and then decreases during drying;

[0055] (4-3) Applying amine-formaldehyde resin glue, the ratio of the front and back sides to glue is 5-6:4-5, the dipping speed is 25-30 m / min, the tension is 45±0.5N, and then drying is carried out, and the temperature is gradually increased and then gradually decreased during drying;

[0056] The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 150% to 200%, a volatile matter of 6.0% to 9.0%, a pre-curing degree of 40% to 65%, and a formaldehyde emission of ≤0.3 mg / L.

[0057] Preferably, in the step (4-1), the urea-formaldehyde resin has a solid content of 46-48%, a viscosity of 13-15 seconds, and a formaldehyde content of ≤0.3%;

[0058] The amine-formaldehyde resin has a solid content of 50-52%, a viscosity of 16-17 seconds, and a formaldehyde content of 0.05-0.1%.

[0059] Preferably, the drying operation in step (4-2) is: passing through three ovens with temperatures set at 130-140°C, 135-145°C and 125-135°C for 26-30 seconds;

[0060] The drying operation in (4-3) is: passing through a six-section oven with temperature settings of 125-135°C, 130-140°C, 140-145°C, 145-150°C, 130-140°C and 120-130°C for 50-55 seconds.

[0061] Preferably, the decorative film paper obtained in step (4) needs to be maintained in an environment with a temperature of 10°C to 25°C and a relative humidity of 40% to 65% for more than one day for curing balance.

[0062] Preferably, the hot pressing in step (5) is specifically performed at a pressure of 15 to 20 MPa, a temperature of 195 to 200° C., and a time of 20 to 25 seconds.

[0063] Specifically, the camera correction system of step (5) comprises an image processing module, a correction device and two camera groups, the two camera groups are respectively distributed above and below the hot pressing station of the blank assembly, each camera group comprises three CCD cameras, which respectively correspond to the three alignment cursors of the synchronous alignment steel template, and the resolution of the CCD camera is 20 million pixels; a fill light is provided next to the CCD camera;

[0064] The CCD camera photographs the cross-marks on the synchronously aligned steel template and the decorative film paper and transmits the photographs to the image processing module. The image processing module analyzes the position deviation between the two and activates the correction device to make the positions of the two coincide.

[0065] The three-point positioning camera technology, positioning image computer processing technology and correction device are used to make the texture of the synchronously-grained steel template coincide with the texture of the decorative film paper. No manual operation is required, the production efficiency is high, and large-scale production can be achieved.

[0066] Compared with the existing technology, the present invention not only focuses on the final step of aligning the synchronous grain steel template and the decorative film paper, but also starts from various production materials, processes and links, analyzes the influencing factors affecting the accuracy of synchronous grain alignment, and adopts specific methods to eliminate or minimize the influencing factors to ensure printing accuracy and pattern clarity. Through a specific production method, the size changes of special base paper, printed decorative paper, decorative film paper and synchronous grain steel template during production are controlled to match each other. At the same time, various production parameters are designed for the special base paper to minimize the deviation while ensuring quality. From each link, it is ensured that the grain deviation of the synchronous grain decorative surface artificial board does not exceed 1mm, achieving precise grain alignment, and the product has delicate texture, three-dimensional and vivid, beautiful and generous, environmentally friendly and healthy, and good decorative effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0067] Figure 1 It is a schematic diagram of the structure of the printed decorative paper of the present invention.

[0068] Reference numerals

[0069] 1. Texture area; 2. Cutting cursor; 3. Pattern cursor; 4. Texture direction mark. DETAILED DESCRIPTION

[0070] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0071] Unless otherwise specified, the materials are conventional commercially available products.

[0072] All physical and chemical properties of the embodiments and comparative examples were measured according to the methods in GB / T 28995-2012.

[0073] Example 1

[0074] A production process for a precisely grained veneer artificial board comprises the following steps:

[0075] (1) Designing and proofing decorative film paper to determine the preparation parameters of the plate roller and the steel template, manufacturing a synchronous grain-aligning printing plate roller and a synchronous grain-aligning steel template, wherein the decorative film paper is provided with a cutting cursor and a pattern-aligning cursor, and the synchronous grain-aligning steel template is provided with a corresponding pattern-aligning cursor;

[0076] (1-1) Designing a predetermined size and texture of the decorative film paper, the decorative film paper is provided with a cutting cursor, and two alignment cursors are respectively provided on both sides of the decorative film paper and are symmetrically distributed, and manufacturing a synchronous alignment printing plate roller corresponding to the decorative film paper.

[0077] (1-1A) Drawing and image processing, selecting walnut for processing and planing, and using color rubbing to make the wood texture clearly visible;

[0078] (1-1B) Use imported high-definition museum-level scanning equipment to scan the wood slice surface to form an image. The optical resolution of the scanning equipment is 1000dpi, which accurately restores the color and preserves the layers and details of the wood texture. Use software to edit and process the image and rearrange it to obtain the desired texture design, and further design the cutting cursor and pattern cursor;

[0079] (1-1C) A synchronous printing plate roller is obtained by subjecting a seamless steel tube to substrate processing to form a base roller, and then subjecting the base roller to electroplating and electronic engraving. The synchronous printing plate roller is provided with a base roller, a pre-plating layer, a platemaking copper layer and a chromium layer from the inside to the outside. The thickness of the chromium layer is 9µm. The mesh fineness of the synchronous printing plate roller is 180 meshes, and the cell depth is 25µm.

[0080] (1-2) Producing a proofing-specific base paper, and testing the texture of the proofing-specific base paper with the synchronous grain-matching printing plate roller to produce a proofing-printing decorative paper.

[0081] (1-3) Dipping in glue, preparing proofing-decorative adhesive film paper, measuring, and determining the preparation parameters of synchronously textured steel templates.

[0082] (1-4) Prepare synchronous steel templates.

[0083] 5mm thick 633 stainless steel is used to remove defects, water grind, polish, and then printed 4 times, etched 3 times, shot blasted twice, electrolyzed once, and soft-lit once to form a concave and convex texture on the surface. The synchronously-grained steel template is then made through electroplating, cutting, and punching.

[0084] In the printing process, the photosensitive ink used in the inkjet is 23 levels, the film exposure time is 30 seconds, the developing frequency is 23Hz, and the printed texture corresponds to the data of the synchronous grain printing plate roller to ensure that the texture of the decorative film paper is consistent with the texture of the synchronous grain steel template.

[0085] In the etching process, the etching solution is a mixture of ferric chloride and hydrochloric acid, the mass concentration of ferric chloride is 700g / L, the amount of hydrochloric acid added is 10mL / L, the etching temperature is 45°C, and the etching speed is 10μm / h.

[0086] In the shot blasting process, the blasting frequency is 4 Hz and the blasting density is 4 g / cm 3 .

[0087] In the electrolysis process, the electrolyte is a mixture of phosphoric acid, sulfuric acid and chromic anhydride, the mass ratio of the three is 6.0:1.0:0.5, and the solution density is 1.65g / cm 3 , electrolysis temperature 60℃, electrolysis time 15min.

[0088] In the soft light process, the sandblasting frequency is 3 Hz and the sandblasting density is 10 g / cm 3 .

[0089] The texture depth of the synchronously textured steel template is 0.1 mm, the texture drop does not exceed 0.1 mm, the texture surface is plated with a super-hard chromium layer, the super-hard chromium layer is 20 µm thick, and the surface hardness is 800 HV.

[0090] Two side edges of the synchronous pattern steel template are also provided with two pattern cursors corresponding to the decorative film paper and are symmetrically distributed.

[0091] (1-5) The synchronously-grained steel template is heated to a preset hot pressing temperature, and the long side expands by 0.20% and the short side expands by 0.12%. The size of the decorative film paper for mass production is measured and determined.

[0092] (2) Batch production of special base paper

[0093] (2-1) Wood pulp (60% by mass), filler (40% by mass) and water (40% by mass) are mixed thoroughly and uniformly by pulping equipment to prepare a coarse pulp (50% by mass).

[0094] The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 5.5:1.0:0.5:0.8, and the modified glass fiber is a silanized glass fiber grafted with aminosulfonate and lignin sulfonate graft copolymer. The coniferous pulp fiber has a length of 2.8 mm and a width of 42 µm, the broadleaf pulp fiber has a length of 0.8 mm and a width of 20 µm, the sea island fiber has a fineness of 0.03 dtex, and the modified glass fiber has a length of 20 µm and a diameter of 6 µm.

[0095] The filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.0:1.5:0.2.

[0096] (2-2) Adding an auxiliary agent accounting for 2% by weight of the crude pulp, wherein the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 6% and a beating degree of 38 0 SR, production pulp with a wet weight of 1.5 g, the refiner's refiner speed was set at 20 m / s.

[0097] (2-3) The production slurry is formed through a wire pressing section at a slurry speed ratio of 1.0, with a moisture content of 35%.

[0098] (2-4) The material obtained in step (2-3) is dried twice, the first drying temperature is 100°C, and the drying time is 4 seconds; the second drying temperature is 100°C, and the drying time is 2 seconds, and the material is dried to a moisture content of 1%, and then sprayed with water again to a moisture content of 2%.

[0099] (2-5) Performing conventional paper surface treatment and winding, i.e., calendering, online paper defect scanning, winding and rewinding, to obtain the special base paper having a longitudinal shrinkage rate of 0.1%, a transverse shrinkage rate of 0.2%, an ash content of 40%, an air permeability of 20s / 100mL, a smoothness of 240s, and a permeability of 5s.

[0100] (3) The synchronously aligned printing plate roller prints the texture on the special base paper to produce printed decorative paper

[0101] The special base paper is printed by a gravure printing machine using water-based ink of four color groups, wherein the fineness of the water-based ink is 10 μm, the viscosity is 15 seconds, and the pH value is 8.5;

[0102] The gravure printing machine has a printing speed of 180 m / min and a tension of 2 kg / cm 2 ;

[0103] Apply ink four times from light to dark, 1% for the base color and 3% for the pattern, and dry after each application of ink;

[0104] The specific operations of the four drying steps corresponding to the four inking steps are as follows:

[0105] The first drying temperature is 150°C and the drying time is 3 seconds;

[0106] The second drying temperature is 150°C and the drying time is 5 seconds;

[0107] The third drying temperature is 150°C and the drying time is 10 seconds;

[0108] The fourth drying temperature is 80°C and the drying time is 15 seconds.

[0109] The overprinting accuracy error of the cutting cursor and the pattern cursor printed in step (3) is 0.5 mm, and the effective printing width deviation is 1 mm.

[0110] like Figure 1 As shown, the printed decorative paper has a texture area 1, four cutting cursors 2, two symmetrical alignment cursors 3 and a texture direction mark 4 for indicating the texture direction.

[0111] (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper.

[0112] (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 0.8:3.8 to prepare a mixed glue solution;

[0113] The urea-formaldehyde resin has a solid content of 46%, a viscosity of 13 seconds, and a formaldehyde content of 0.1%;

[0114] The amine-formaldehyde resin has a solid content of 50%, a viscosity of 16 seconds, and a formaldehyde content of 0.05%.

[0115] (4-2) The printed decorative paper is immersed in the mixed glue solution, with the front and back sides immersed in glue at a ratio of 2.8:1.8, an immersion speed of 25 m / min, a tension of 44.5 N, and then dried in a three-section oven with temperatures set at 130°C, 135°C and 125°C for 26 seconds.

[0116] (4-3) Then apply amine-formaldehyde resin glue, with the front and back sides dipping in a ratio of 5:4, dipping speed 25 m / min, tension 44.5 N, and then dry in a six-section oven with temperatures set at 125°C, 130°C, 140°C, 145°C, 130°C and 120°C for 50 seconds.

[0117] The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 150%, a volatile matter of 6.0%, a pre-curing degree of 40%, and a formaldehyde emission of 0.1 mg / L.

[0118] The prepared decorative film paper was cured and balanced in an environment with a temperature of 10° C. and a relative humidity of 40% for 2 days.

[0119] (5) The synchronous alignment steel template is installed on the hot pressing equipment, and the decorative film paper and the artificial board substrate are transported to the assembly hot pressing station. The alignment cursor of the synchronous alignment steel template is aligned with the alignment cursor of the decorative film paper through the camera correction system, and then hot pressing is performed at a pressure of 15 MPa, a temperature of 195°C, and a time of 20 seconds to produce a precisely aligned veneered artificial board.

[0120] The camera correction system includes an image processing module, a correction device and two camera groups, which are respectively distributed above and below the hot pressing station of the blank assembly. Each camera group includes three CCD cameras, which respectively correspond to the three alignment cursors of the synchronous alignment steel template. The resolution of the CCD camera is 20 million pixels. A fill light is provided next to the CCD camera.

[0121] The CCD camera photographs the cross-marks on the synchronously aligned steel template and the decorative film paper and transmits the photographs to the image processing module. The image processing module analyzes the position deviation between the two and activates the correction device to make the positions of the two coincide.

[0122] The grain alignment deviation of the finally obtained Example 1 does not exceed 1 mm, achieving precise grain alignment.

[0123] Example 2

[0124] A production process for a precisely grained veneer artificial board comprises the following steps:

[0125] (1) Designing and proofing decorative film paper to determine the preparation parameters of the plate roller and the steel template, manufacturing a synchronous grain-aligning printing plate roller and a synchronous grain-aligning steel template, wherein the decorative film paper is provided with a cutting cursor and a pattern-aligning cursor, and the synchronous grain-aligning steel template is provided with a corresponding pattern-aligning cursor;

[0126] (1-1) Designing a predetermined size and texture of the decorative film paper, the decorative film paper is provided with a cutting cursor, and two alignment cursors are respectively provided on both sides of the decorative film paper and are symmetrically distributed, and manufacturing a synchronous alignment printing plate roller corresponding to the decorative film paper.

[0127] (1-1A) Drawing and image processing, selecting wenge for processing and planing, and using chemical weathering to make the wood texture clearly visible;

[0128] (1-1B) Use imported high-definition museum-level scanning equipment to scan the wood slice surface to form an image. The optical resolution of the scanning equipment is 1000dpi, which accurately restores the color and preserves the layers and details of the wood texture. Use software to edit and process the image and rearrange it to obtain the desired texture design, and further design the cutting cursor and pattern cursor;

[0129] (1-1C) A synchronous printing plate roller is obtained by subjecting a seamless steel tube to substrate processing to form a base roller, and then subjecting the base roller to electroplating and electronic engraving. The synchronous printing plate roller is provided with a base roller, a pre-plating layer, a platemaking copper layer and a chromium layer from the inside to the outside. The thickness of the chromium layer is 10µm. The mesh fineness of the synchronous printing plate roller is 220 meshes, and the cell depth is 30µm.

[0130] (1-2) Producing a proofing-specific base paper, and testing the texture of the proofing-specific base paper with the synchronous grain-matching printing plate roller to produce a proofing-printing decorative paper.

[0131] (1-3) Dipping in glue, preparing proofing-decorative adhesive film paper, measuring, and determining the preparation parameters of synchronously textured steel templates.

[0132] (1-4) Prepare synchronous steel templates.

[0133] 5mm thick 633 stainless steel is used to remove defects, water grind, polish, and then printed 4 times, etched 3 times, shot blasted twice, electrolyzed once, and soft-lit once to form a concave and convex texture on the surface. The synchronously-grained steel template is then made through electroplating, cutting, and punching.

[0134] In the printing process, the photosensitive ink used in the inkjet is 24 levels of inkjet volume, the film exposure time is 75 seconds, the developing frequency is 24Hz, and the printed texture corresponds to the data of the synchronous grain printing plate roller to ensure that the texture of the decorative film paper is consistent with the texture of the synchronous grain steel template.

[0135] In the etching process, the etching solution is a mixture of ferric chloride and hydrochloric acid, the mass concentration of ferric chloride is 750g / L, the amount of hydrochloric acid added is 15mL / L, the etching temperature is 47°C, and the etching speed is 15μm / h.

[0136] In the shot blasting process, the blasting frequency is 4.5 Hz and the blasting density is 4.5 g / cm 3 .

[0137] In the electrolysis process, the electrolyte is a mixture of phosphoric acid, sulfuric acid and chromic anhydride, the mass ratio of the three is 6.5:1.3:0.8, and the solution density is 1.70g / cm 3 , electrolysis temperature 67℃, electrolysis time 23min.

[0138] In the soft light process, the sandblasting frequency is 3.5 Hz and the sandblasting density is 12 g / cm 3 .

[0139] The texture depth of the synchronously textured steel template is 0.2 mm, the texture drop does not exceed 0.1 mm, the texture surface is plated with a super-hard chromium layer, the super-hard chromium layer is 35 µm thick, and the surface hardness is 900 HV.

[0140] Two side edges of the synchronous pattern steel template are also provided with two pattern cursors corresponding to the decorative film paper and are symmetrically distributed.

[0141] (1-5) The synchronously-grained steel template is heated to a preset hot pressing temperature, and the long side expands by 0.18% and the short side expands by 0.11%. The size of the decorative film paper for mass production is measured and determined.

[0142] (2) Batch production of special base paper

[0143] (2-1) Wood pulp (70% by mass), filler (30% by mass) and water (30% by mass) are mixed thoroughly and uniformly by a pulping device to prepare a coarse pulp (55% by mass).

[0144] The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 5.8:1.3:0.8:0.9, and the modified glass fiber is a silanized glass fiber grafted with aminosulfonate and lignin sulfonate graft copolymer. The coniferous pulp fiber has a length of 3.5 mm and a width of 49 µm, the broadleaf pulp fiber has a length of 1 mm and a width of 25 µm, the sea island fiber has a fineness of 0.04 dtex, and the modified glass fiber has a length of 30 µm and a diameter of 10 µm.

[0145] The filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.25:2.3:0.25.

[0146] (2-2) Adding an auxiliary agent accounting for 3.5% by weight of the crude pulp, wherein the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 7% and a beating degree of 33 0 SR, production pulp with a wet weight of 1.25 g, the refiner's refiner speed was set at 25 m / s.

[0147] (2-3) The production slurry is formed through a wire pressing section at a slurry speed ratio of 1.25, with a moisture content of 45%.

[0148] (2-4) The material obtained in step (2-3) is dried twice, the first drying temperature is 120°C, and the drying time is 7 seconds; the second drying temperature is 125°C, and the drying time is 6 seconds, until the moisture content is 1.5%, and then the material is sprayed with water again to a moisture content of 3%.

[0149] (2-5) Conventional paper surface treatment and winding, i.e., calendering, online paper defect scanning, winding and rewinding, are performed to obtain the special base paper having a longitudinal shrinkage rate of 0.08%, a transverse shrinkage rate of 0.15%, an ash content of 35%, an air permeability of 28s / 100mL, a smoothness of 230s, and a permeability of 4s.

[0150] (3) The synchronously aligned printing plate roller prints the texture on the special base paper to produce printed decorative paper

[0151] The special base paper is printed by a gravure printing machine using water-based ink of four color groups, wherein the fineness of the water-based ink is 8 μm, the viscosity is 17 seconds, and the pH value is 8.8;

[0152] The gravure printing machine has a printing speed of 190 m / min and a tension of 2.3 kg / cm 2 ;

[0153] Apply ink four times from light to dark, 2% for base color and 5.5% for pattern, and dry after each application of ink;

[0154] The specific operations of the four drying steps corresponding to the four inking steps are as follows:

[0155] The first drying temperature is 185°C and the drying time is 4 seconds;

[0156] The second drying temperature is 175°C and the drying time is 8 seconds;

[0157] The third drying temperature is 175°C and the drying time is 12 seconds;

[0158] The fourth drying temperature is 130°C and the drying time is 18 seconds.

[0159] The overprinting accuracy error of the cutting cursor and the pattern cursor printed in step (3) is 0.3 mm, and the effective printing width deviation is 0.7 mm.

[0160] like Figure 1 As shown, the printed decorative paper has a texture area 1, four cutting cursors 2, two symmetrical alignment cursors 3 and a texture direction mark 4 for indicating the texture direction.

[0161] (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper.

[0162] (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 1.0:4 to prepare a mixed glue solution;

[0163] The urea-formaldehyde resin has a solid content of 47%, a viscosity of 14 seconds, and a formaldehyde content of 0.2%;

[0164] The amine-formaldehyde resin has a solid content of 51%, a viscosity of 17 seconds, and a formaldehyde content of 0.08%.

[0165] (4-2) The printed decorative paper is immersed in the mixed glue solution, with the front and back sides immersed in glue in a ratio of 3:2, an immersion speed of 28 m / min, a tension of 45 N, and then dried in a three-section oven with temperatures set at 135°C, 140°C and 130°C for 28 seconds.

[0166] (4-3) Amine-formaldehyde resin glue was then applied, with the front and back sides dipping in a ratio of 5.5:4.5, the dipping speed was 28 m / min, the tension was 45 N, and then the mixture was dried in a six-section oven with the temperatures set at 130°C, 135°C, 142°C, 147°C, 135°C and 125°C for 53 seconds.

[0167] The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 175%, a volatile matter of 7.5%, a pre-curing degree of 53%, and a formaldehyde emission of 0.2 mg / L.

[0168] The prepared decorative film paper was cured and balanced in an environment with a temperature of 18° C. and a relative humidity of 53% for 2 days.

[0169] (5) The synchronous alignment steel template is installed on the hot pressing equipment, and the decorative film paper and the artificial board substrate are transported to the assembly hot pressing station. The alignment cursor of the synchronous alignment steel template is aligned with the alignment cursor of the decorative film paper through the camera correction system, and then hot pressing is performed at a pressure of 18 MPa, a temperature of 198°C, and a time of 22 seconds to produce a precisely aligned veneered artificial board.

[0170] The camera correction system includes an image processing module, a correction device and two camera groups, which are respectively distributed above and below the hot pressing station of the blank assembly. Each camera group includes three CCD cameras, which respectively correspond to the three alignment cursors of the synchronous alignment steel template. The resolution of the CCD camera is 20 million pixels. A fill light is provided next to the CCD camera.

[0171] The CCD camera photographs the cross-marks on the synchronously aligned steel template and the decorative film paper and transmits the photographs to the image processing module. The image processing module analyzes the position deviation between the two and activates the correction device to make the positions of the two coincide.

[0172] The grain alignment deviation of the finally obtained Example 2 does not exceed 1 mm, achieving precise grain alignment.

[0173] Example 3

[0174] A production process for a precisely grained veneer artificial board comprises the following steps:

[0175] (1) Designing and proofing decorative film paper to determine the preparation parameters of the plate roller and the steel template, manufacturing a synchronous grain-aligning printing plate roller and a synchronous grain-aligning steel template, wherein the decorative film paper is provided with a cutting cursor and a pattern-aligning cursor, and the synchronous grain-aligning steel template is provided with a corresponding pattern-aligning cursor;

[0176] (1-1) Designing a predetermined size and texture of the decorative film paper, the decorative film paper is provided with a cutting cursor, and two alignment cursors are respectively provided on both sides of the decorative film paper and are symmetrically distributed, and manufacturing a synchronous alignment printing plate roller corresponding to the decorative film paper.

[0177] (1-1A) Drawing and image processing, selecting redwood for processing and planing, using methods such as rubbing or chemical weathering to make the wood texture clearly visible;

[0178] (1-1B) Use imported high-definition museum-level scanning equipment to scan the wood slice surface to form an image. The optical resolution of the scanning equipment is 1000dpi, which accurately restores the color and preserves the layers and details of the wood texture. Use software to edit and process the image and rearrange it to obtain the desired texture design, and further design the cutting cursor and pattern cursor;

[0179] (1-1C) A synchronous printing plate roller is obtained by subjecting a seamless steel tube to substrate processing to form a base roller, and then subjecting the base roller to electroplating and electronic engraving. The synchronous printing plate roller is provided with a base roller, a pre-plating layer, a platemaking copper layer and a chromium layer from the inside to the outside. The thickness of the chromium layer is 11µm. The mesh fineness of the synchronous printing plate roller is 250 meshes, and the cell depth is 35µm.

[0180] (1-2) Producing a proofing-specific base paper, and testing the texture of the proofing-specific base paper with the synchronous grain-matching printing plate roller to produce a proofing-printing decorative paper.

[0181] (1-3) Dipping in glue, preparing proofing-decorative adhesive film paper, measuring, and determining the preparation parameters of synchronously textured steel templates.

[0182] (1-4) Prepare synchronous steel templates.

[0183] 5mm thick 633 stainless steel is used to remove defects, water grind, polish, and then printed 4 times, etched 3 times, shot blasted twice, electrolyzed once, and soft-lit once to form a concave and convex texture on the surface. The synchronously-grained steel template is then made through electroplating, cutting, and punching.

[0184] In the printing process, the photosensitive ink used in the inkjet is 25 levels, the film exposure time is 120 seconds, the developing frequency is 25Hz, and the printed texture corresponds to the data of the synchronously aligned printing plate roller, ensuring that the texture of the decorative film paper is consistent with the texture of the synchronously aligned steel template.

[0185] In the etching process, the etching solution is a mixture of ferric chloride and hydrochloric acid, the mass concentration of ferric chloride is 800g / L, the amount of hydrochloric acid added is 20mL / L, the etching temperature is 50°C, and the etching speed is 20μm / h.

[0186] In the shot blasting process, the blasting frequency is 5 Hz and the blasting density is 5 g / cm 3 .

[0187] In the electrolysis process, the electrolyte is a mixture of phosphoric acid, sulfuric acid and chromic anhydride, the mass ratio of the three is 7.0:1.5:1.0, and the solution density is 1.75g / cm 3 , electrolysis temperature 75℃, electrolysis time 30min.

[0188] In the soft light process, the sandblasting frequency is 4 Hz and the sandblasting density is 13 g / cm 3 .

[0189] The texture depth of the synchronously textured steel template is 0.3 mm, the texture drop does not exceed 0.1 mm, the texture surface is plated with a super-hard chromium layer, the super-hard chromium layer is 50 µm thick, and the surface hardness is 1000 HV.

[0190] Two side edges of the synchronous pattern steel template are also provided with two pattern cursors corresponding to the decorative film paper and are symmetrically distributed.

[0191] (1-5) The synchronously-grained steel template is heated to a preset hot pressing temperature, and the long side expands by 0.16% and the short side expands by 0.11%. The size of the decorative film paper for mass production is measured and determined.

[0192] (2) Batch production of special base paper

[0193] (2-1) 80% by mass of wood pulp, 20% by mass of filler and water are fully mixed by pulping equipment to prepare a coarse pulp with a mass fraction of 60%.

[0194] The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 6.0:1.5:1.0:1.0, and the modified glass fiber is a silanized glass fiber grafted with aminosulfonate and lignin sulfonate graft copolymer. The coniferous pulp fiber has a length of 4.2 mm and a width of 56 µm, the broadleaf pulp fiber has a length of 1.2 mm and a width of 30 µm, the sea island fiber has a fineness of 0.05 dtex, and the modified glass fiber has a length of 40 µm and a diameter of 14 µm.

[0195] The filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.5:3.0:0.3.

[0196] (2-2) Adding an auxiliary agent accounting for 5% by weight of the crude pulp, wherein the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 8% and a beating degree of 28 0SR, production pulp with a wet weight of 1.0 g, the refiner's refiner speed was set at 30 m / s.

[0197] (2-3) The production slurry is formed through a wire pressing section at a slurry speed ratio of 1.5, with a moisture content of 55%.

[0198] (2-4) The material obtained in step (2-3) is dried twice, the first drying temperature is 140°C, and the drying time is 9 seconds; the second drying temperature is 150°C, and the drying time is 9 seconds, until the moisture content is 2%, and then the material is sprayed with water again to a moisture content of 4%.

[0199] (2-5) Performing conventional paper surface treatment and winding, i.e., calendering, online paper defect scanning, winding and rewinding, to obtain the special base paper having a longitudinal shrinkage rate of 0.05%, a transverse shrinkage rate of 0.1%, an ash content of 30%, an air permeability of 35s / 100mL, a smoothness of 220s, and a permeability of 3s.

[0200] (3) The synchronously aligned printing plate roller prints the texture on the special base paper to produce printed decorative paper

[0201] The special base paper is printed by a gravure printing machine using water-based ink of four color groups, wherein the fineness of the water-based ink is 5 μm, the viscosity is 18 seconds, and the pH value is 9.0;

[0202] The gravure printing machine has a printing speed of 200 m / min and a tension of 2.5 kg / cm 2 ;

[0203] Apply ink four times from light to dark, 3% for the base color and 8% for the pattern, and dry after each inking.

[0204] The specific operations of the four drying steps corresponding to the four inking steps are as follows:

[0205] The first drying temperature is 220℃ and the drying time is 5 seconds;

[0206] The second drying temperature is 200°C and the drying time is 10 seconds;

[0207] The third drying temperature is 200°C and the drying time is 15 seconds;

[0208] The fourth drying temperature is 180°C and the drying time is 20 seconds.

[0209] The overprinting accuracy error of the cutting cursor and the pattern cursor printed in step (3) is 0.2 mm, and the effective printing width deviation is 0.5 mm.

[0210] like Figure 1As shown, the printed decorative paper has a texture area 1, four cutting cursors 2, two symmetrical alignment cursors 3 and a texture direction mark 4 for indicating the texture direction.

[0211] (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper.

[0212] (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 1.2:4.2 to prepare a mixed glue solution;

[0213] The urea-formaldehyde resin has a solid content of 48%, a viscosity of 15 seconds, and a formaldehyde content of 0.3%;

[0214] The amine-formaldehyde resin has a solid content of 52%, a viscosity of 17 seconds, and a formaldehyde content of 0.1%.

[0215] (4-2) The printed decorative paper is immersed in the mixed glue solution, with the front and back sides immersed in glue at a ratio of 3.2:2.2, an immersion speed of 30 m / min, and a tension of 45.5 N. The paper is then dried in a three-section oven at temperatures set at 140° C., 145° C., and 135° C. for 30 seconds.

[0216] (4-3) Then apply amine-formaldehyde resin glue, with the front and back sides dipping in a ratio of 6:5, dipping speed 30 m / min, tension 45.5 N, and then dry in a six-section oven with temperatures set at 135°C, 140°C, 145°C, 150°C, 140°C and 130°C for 55 seconds.

[0217] The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 200%, a volatile matter of 9.0%, a pre-curing degree of 65%, and a formaldehyde emission of 0.3 mg / L.

[0218] The prepared decorative film paper was cured and balanced in an environment with a temperature of 25° C. and a relative humidity of 65% for 2 days.

[0219] (5) The synchronous alignment steel template is installed on the hot pressing equipment, and the decorative film paper and the artificial board substrate are transported to the assembly hot pressing station. The alignment cursor of the synchronous alignment steel template is aligned with the alignment cursor of the decorative film paper through the camera correction system, and then hot pressing is performed at a pressure of 20 MPa, a temperature of 200°C, and a time of 25 seconds to produce a precisely aligned veneered artificial board.

[0220] The camera correction system includes an image processing module, a correction device and two camera groups, which are respectively distributed above and below the hot pressing station of the blank assembly. Each camera group includes three CCD cameras, which respectively correspond to the three alignment cursors of the synchronous alignment steel template. The resolution of the CCD camera is 20 million pixels. A fill light is provided next to the CCD camera.

[0221] The CCD camera photographs the cross-marks on the synchronously aligned steel template and the decorative film paper and transmits the photographs to the image processing module. The image processing module analyzes the position deviation between the two and activates the correction device to make the positions of the two coincide.

[0222] The grain alignment deviation of the finally obtained Example 3 does not exceed 1 mm, achieving precise grain alignment.

[0223] Comparative Example 1

[0224] Except for the preparation of the following base paper, other operations of Comparative Example 2 are the same as those of Example 1.

[0225] (2) Making base paper

[0226] (2-1) Wood pulp (60% by mass), filler (40% by mass) and water (40% by mass) are mixed thoroughly and uniformly by pulping equipment to prepare a coarse pulp (50% by mass).

[0227] The wood pulp is a mixture of coniferous pulp and broadleaf pulp in a mass ratio of 5.5:1. The coniferous pulp fiber has a length of 2.8 mm and a width of 42 µm, and the broadleaf pulp fiber has a length of 0.8 mm and a width of 20 µm.

[0228] The filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.0:1.5:0.2.

[0229] (2-2) Adding an auxiliary agent accounting for 2% by weight of the crude pulp, wherein the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 6% and a beating degree of 38 0 SR, production pulp with a wet weight of 1.5 g, the refiner's refiner speed was set at 20 m / s.

[0230] (2-3) The production slurry is formed through a wire pressing section at a slurry speed ratio of 1.0, with a moisture content of 35%.

[0231] (2-4) The material obtained in step (2-3) is dried twice, the first drying temperature is 100°C, and the drying time is 4 seconds; the second drying temperature is 100°C, and the drying time is 2 seconds, and the material is dried to a moisture content of 1%, and then sprayed with water again to a moisture content of 2%.

[0232] (2-5) Conventional paper surface treatment and winding, i.e., calendering, online paper defect scanning, winding and rewinding, were performed to obtain base paper with a longitudinal shrinkage rate of 0.3%, a transverse shrinkage rate of 1.0%, an ash content of 40%, an air permeability of 20s / 100mL, a smoothness of 240s, and a permeability of 5s.

[0233] The alignment deviation of the comparative example 1 finally obtained exceeded 1 mm, and the alignment accuracy was not as good as that of the embodiment 1.

[0234] Comparative Example 2

[0235] Except for the preparation of the following base paper, other operations of Comparative Example 2 are the same as those of Example 1.

[0236] (2) Making base paper

[0237] (2-1) Wood pulp (60% by mass), filler (40% by mass) and water (40% by mass) are mixed thoroughly and uniformly by pulping equipment to prepare a coarse pulp (50% by mass).

[0238] The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 1:5.5:0.5:0.8, and the modified glass fiber is a silanized glass fiber grafted with aminosulfonate and lignin sulfonate graft copolymer. The coniferous pulp fiber has a length of 2.8 mm and a width of 42 µm, the broadleaf pulp fiber has a length of 0.8 mm and a width of 20 µm, the sea island fiber has a fineness of 0.03 dtex, and the modified glass fiber has a length of 20 µm and a diameter of 6 µm.

[0239] The filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.0:1.5:0.2.

[0240] (2-2) Adding an auxiliary agent accounting for 2% by weight of the crude pulp, wherein the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:1, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 6% and a beating degree of 45 0 SR, production pulp with a wet weight of 1.5 g, the refiner's refiner speed was set at 20 m / s.

[0241] (2-3) The production slurry is formed through a wire pressing section at a slurry speed ratio of 1.0, with a moisture content of 35%.

[0242] (2-4) The material obtained in step (2-3) is dried twice, the first drying temperature is 100°C, and the drying time is 4 seconds; the second drying temperature is 100°C, and the drying time is 2 seconds, and the material is dried to a moisture content of 1%, and then sprayed with water again to a moisture content of 2%.

[0243] (2-5) Conventional paper surface treatment and winding, i.e., calendering, online paper defect scanning, winding and rewinding, were performed to obtain base paper with a longitudinal shrinkage rate of 0.5%, a transverse shrinkage rate of 1.5%, an ash content of 38%, an air permeability of 25s / 100mL, a smoothness of 250s, and a permeability of 6s.

[0244] The alignment deviation of the comparative example 1 finally obtained exceeded 1 mm, and the alignment accuracy was not as good as that of the embodiment 1.

[0245] According to GB / T 28995-2012, the longitudinal wet tensile strength and longitudinal dry tensile strength of Examples 1 to 3 and Comparative Examples 1 to 2 were measured.

[0246]

[0247] By comparing the tensile strength data of Example 1 and Comparative Example 1, it can be seen that the island fiber and modified glass fiber have a reinforcing effect on the special base paper of the present application; by comparing the tensile strength data of Example 1 and Comparative Example 2, it can be seen that the ratio of coniferous pulp and broadleaf pulp of the present application is specifically designed, otherwise the special base paper of the present invention cannot achieve ideal physical and chemical properties.

[0248] Comparative Example 3

[0249] Except for the preparation of the following printed decorative paper, other operations of Comparative Example 3 are the same as those of Example 1.

[0250] (3) Printing textures on special base paper using synchronously aligned printing plate rollers to produce printed decorative paper

[0251] The special base paper is printed by a gravure printing machine using water-based ink of four color groups, wherein the fineness of the water-based ink is 10 μm, the viscosity is 15 seconds, and the pH value is 8.5;

[0252] The gravure printing machine has a printing speed of 100 m / min and a tension of 1.5 kg / cm 2 ;

[0253] Apply ink four times from light to dark, 1% for the base color and 3% for the pattern, and dry after each application of ink;

[0254] The specific operations of the four drying steps corresponding to the four inking steps are as follows:

[0255] The first drying temperature is 100°C and the drying time is 6 seconds;

[0256] The second drying temperature is 100°C and the drying time is 6 seconds;

[0257] The third drying temperature is 80°C and the drying time is 8 seconds;

[0258] The fourth drying temperature is 80°C and the drying time is 8 seconds.

[0259] The overprinting accuracy error of the cutting cursor and the pattern cursor printed in step (3) is 1 mm, and the effective printing width deviation is 3 mm.

[0260] The printing deviation of the printed decorative paper of Comparative Example 3 finally obtained was too large, which affected the operation of subsequent processes and failed to achieve accurate grain alignment.

[0261] Comparative Example 4

[0262] Except for the preparation of the following steel template, other operations of Comparative Example 4 are the same as those of Example 1.

[0263] (1-4) Prepare steel template.

[0264] 5mm thick 304 stainless steel is used to remove defects, water grind, polish, and then printed 4 times, etched 3 times, shot blasted twice, electrolyzed once, and soft-lit once to form a concave and convex texture on the surface. The steel template is then made by electroplating, cutting, and punching.

[0265] In the printing process, the photosensitive ink used in the inkjet is 24 levels, the film exposure time is 75 seconds, the developing frequency is 24Hz, and the printed texture corresponds to the data of the synchronous pattern printing plate roller to ensure that the texture of the decorative film paper is consistent with the texture of the steel template.

[0266] In the etching process, the etching solution is a mixture of ferric chloride and hydrochloric acid, the mass concentration of ferric chloride is 750g / L, the amount of hydrochloric acid added is 15mL / L, the etching temperature is 47°C, and the etching speed is 15μm / h.

[0267] In the shot blasting process, the blasting frequency is 4.5 Hz and the blasting density is 4.5 g / cm 3 .

[0268] In the electrolysis process, the electrolyte is a mixture of phosphoric acid, sulfuric acid and chromic anhydride, the mass ratio of the three is 6.5:1.3:0.8, and the solution density is 1.70g / cm 3 , electrolysis temperature 67℃, electrolysis time 23min.

[0269] In the soft light process, the sandblasting frequency is 3.5 Hz and the sandblasting density is 12 g / cm 3 .

[0270] The texture depth of the prepared steel template is 0.2 mm, and the texture drop does not exceed 0.1 mm.

[0271] Two aligning cursors are also arranged on both sides of the steel template corresponding to the decorative adhesive film paper and are symmetrically distributed.

[0272] The steel template is heated to a preset hot pressing temperature, and the long side expands by 0.26-0.30% and the short side expands by 0.21-0.22%.

[0273] The expansion rate of the steel template of Comparative Example 4 finally obtained is relatively high, which is not conducive to determining the size of the decorative film paper produced in batches and controlling other production parameters, and it is difficult to achieve precise grain alignment.

[0274] Comparative Example 5

[0275] Except for the preparation of the following decorative film paper, other operations of Comparative Example 5 are the same as those of Example 1.

[0276] (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper.

[0277] (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 0.8:3.8 to prepare a mixed glue solution;

[0278] The urea-formaldehyde resin has a solid content of 46%, a viscosity of 13 seconds, and a formaldehyde content of 0.1%;

[0279] The amine-formaldehyde resin has a solid content of 50%, a viscosity of 16 seconds, and a formaldehyde content of 0.05%.

[0280] (4-2) The printed decorative paper is immersed in the mixed glue solution, with the front and back sides immersed in glue at a ratio of 2.8:1.8, an immersion speed of 32 m / min, and a tension of 40 N. The paper is then dried in a three-section oven with temperatures set at 120°C, 115°C, and 130°C for 40 seconds.

[0281] (4-3) Then apply amine-formaldehyde resin glue, with the front and back sides dipping in a ratio of 5:4, dipping speed 32 m / min, tension 40 N, and then dry in a six-section oven with temperatures set at 145°C, 120°C, 130°C, 135°C, 120°C and 140°C for 60 seconds.

[0282] The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 150%, a volatile matter of 6.0%, a pre-curing degree of 40%, and a formaldehyde emission of 0.1 mg / L.

[0283] The prepared decorative film paper was cured and balanced in an environment with a temperature of 10° C. and a relative humidity of 40% for 2 days.

[0284] The size of the decorative film paper of Comparative Example 5 finally obtained deviates too much from the size of the synchronously aligned grain steel template after heating, and accurate grain alignment cannot be achieved.

[0285] According to the disclosure and teaching of the above description, those skilled in the art to which the present invention belongs may also make changes and modifications to the above embodiments. Therefore, the present invention is not limited to the specific embodiments disclosed and described above, and some modifications and changes to the present invention should also fall within the scope of protection of the claims of the present invention. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the present invention.

Claims

1. A production process for a precisely grained veneer artificial board, characterized in that: The following steps are involved: (1) Designing and proofing decorative film paper to determine the preparation parameters of the plate roller and the steel template, manufacturing a synchronous grain-aligning printing plate roller and a synchronous grain-aligning steel template, wherein the decorative film paper is provided with a cutting cursor and a pattern-aligning cursor, and the synchronous grain-aligning steel template is provided with a corresponding pattern-aligning cursor; (2) Batch production of base paper; (2-1) fully mixing 60-80% by mass of wood pulp, 20-40% by mass of filler and water through a pulping device to prepare a coarse pulp with a mass fraction of 50-60%; The wood pulp is a mixture of coniferous pulp, broadleaf pulp, sea island fiber and modified glass fiber in a mass ratio of 5.5-6.0:1.0-1.5:0.5-1.0:0.8-1.0; The coniferous pulp fiber has a length of 2.8 to 4.2 mm and a width of 42 to 56 µm, the broadleaf pulp fiber has a length of 0.8 to 1.2 mm and a width of 20 to 30 µm, the sea island fiber has a fineness of 0.03 to 0.05 dtex, and the modified glass fiber has a length of 20 to 40 µm and a diameter of 6 to 14 µm; (2-2) Adding an auxiliary agent accounting for 2 to 5% by weight of the crude pulp, and using a pulping machine to make the crude pulp into a pulp with a mass fraction of 6 to 8% and a beating degree of 28 to 38 0 SR, production slurry with a wet weight of 1.0 to 1.5 g, the refiner has a refiner plate speed of 20 to 30 m / s; (2-3) forming the production slurry through a wire pressing section at a slurry speed ratio of 1.0 to 1.5, with a moisture content of 35 to 55%; (2-4) treating the material obtained in step (2-3) to a moisture content of 2 to 4%; (2-5) performing conventional paper sheet surface treatment and winding to obtain the base paper having a longitudinal shrinkage of 0.05-0.1%, a transverse shrinkage of 0.1-0.2%, an ash content of 30-40%, an air permeability of 20-35 s / 100 mL, a smoothness of 220-240 s, and a permeability of 3-5 s; (3) The synchronous pattern-matching printing plate roller prints texture, cutting cursor and pattern-matching cursor on the base paper to produce printed decorative paper; (4) The printed decorative paper is dipped in glue and cut according to the cutting cursor to obtain decorative adhesive film paper; (5) The synchronous alignment steel template is installed on the hot pressing equipment, and the decorative film paper and the artificial board substrate are transported to the assembly hot pressing station. The alignment cursor of the synchronous alignment steel template is aligned with the alignment cursor of the decorative film paper through the camera correction system, and then hot pressing is performed to produce a precisely aligned veneered artificial board.

2. The production process according to claim 1, characterized in that: In step (1), the synchronous printing plate roller is provided with a base roller, a pre-plating layer, a platemaking copper layer and a chromium layer from the inside to the outside, the thickness of the chromium layer is 9-11 μm, the mesh fineness of the synchronous printing plate roller is 180-250 meshes, and the cell depth is 25-35 μm.

3. The production process according to claim 1 or 2, characterized in that: In step (1), the texture depth of the synchronously textured steel template is 0.1-0.3 mm, the texture height is not more than 0.1 mm, the texture surface is plated with a super-hard chromium layer, the thickness of the super-hard chromium layer is 20-50 µm, and the surface hardness is 800-1000 HV; After the synchronously corrugated steel template is heated to a preset hot pressing temperature, the long side expands by 0.16% to 0.20% and the short side expands by 0.11% to 0.12%.

4. The production process according to claim 1, wherein in step (2-1), the filler is a mixture of kaolin, titanium dioxide and pigment in a mass ratio of 1.0-1.5:1.5-3.0:0.2-0.3; In the step (2-2), the auxiliary agent is a mixture of PVA, cationic starch and polyacrylamide in a ratio of 20:15:

1.

5. The production process according to claim 1 or 4, characterized in that: The specific operation of step (2-4) is: drying the material obtained in step (2-3) to a moisture content of 1 to 2%, and then re-wetting to a moisture content of 2 to 4%; The specific operation of the drying is: drying the material obtained in step (2-3) twice, the first drying temperature is 100-140°C, and the drying time is 4-9S; the second drying temperature is 100-150°C, and the drying time is 2-9S.

6. The production process according to claim 1, characterized in that: In the step (3), the base paper is printed with water-based inks of four color groups by a gravure printing machine, and inking is performed four times from light to dark, with the amount of ink applied to the base color being 1-3% and the amount of ink applied to the printed pattern being 3-8%, and drying is performed after each inking; The water-based ink has a fineness of less than 10 μm, a viscosity of 15 to 18 seconds, and a pH value of 8.5 to 9.0; The gravure printing machine has a printing speed of 180-200 m / min and a tension of 2-2.5 kg / cm 2 ; The overprinting accuracy error of the cutting cursor and the pattern cursor printed in step (3) does not exceed 0.5 mm, and the effective printing width deviation does not exceed 1 mm.

7. The production process according to claim 1, characterized in that: In step (4), the specific operation of dipping the printed decorative paper into glue is as follows: (4-1) urea-formaldehyde resin glue and amine-formaldehyde resin glue are mixed in a mass ratio of 0.8-1.2:3.8-4.2 to prepare a mixed glue solution; (4-2) The printed decorative paper is immersed in the mixed glue solution, the front and back sides are immersed in glue at a ratio of 2.8-3.2:1.8-2.2, the immersion speed is 25-30 m / min, the tension is 45±0.5N, and then dried, and the temperature rises first and then decreases during drying; (4-3) Applying amine-formaldehyde resin glue, the ratio of the front and back sides to glue is 5-6:4-5, the dipping speed is 25-30 m / min, the tension is 45±0.5N, and then drying is carried out, and the temperature is gradually increased and then gradually decreased during drying; The decorative adhesive film paper prepared in step (4) has an adhesive impregnation amount of 150% to 200%, a volatile matter of 6.0% to 9.0%, a pre-curing degree of 40% to 65%, and a formaldehyde emission of ≤0.3 mg / L.

8. The production process according to claim 7, characterized in that: In the step (4-1), the urea-formaldehyde resin has a solid content of 46-48%, a viscosity of 13-15 seconds, and a formaldehyde content of ≤0.3%; The amine-formaldehyde resin has a solid content of 50-52%, a viscosity of 16-17 seconds, and a formaldehyde content of 0.05-0.1%.

9. The production process according to claim 7, characterized in that: The drying operation in step (4-2) is: passing through three drying ovens with temperatures set at 130-140°C, 135-145°C and 125-135°C for 26-30 seconds; The drying operation in (4-3) is: passing through a six-section oven with temperature settings of 125-135°C, 130-140°C, 140-145°C, 145-150°C, 130-140°C and 120-130°C for 50-55 seconds.

10. The production process according to claim 1, characterized in that: The hot pressing in step (5) is specifically performed at a pressure of 15 to 20 MPa, a temperature of 195 to 200° C., and a time of 20 to 25 seconds.

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