Mirror surface treatment process for purple-light wingceltis furniture and purple-light wingceltis furniture

Abstract

The invention discloses a purple light wingceltis furniture mirror surface treatment process and purple light wingceltis furniture, and belongs to the technical field of furniture surface treatment.The purple light wingceltis furniture mirror surface treatment process comprises the specific steps that S1, a wood component is subjected to vacuum impregnation stabilization treatment; s2, the wood component treated in the S1 is subjected to multi-stage drying, moisture regaining and re-drying treatment; s3, the wood component treated in the S2 is soaked in wax liquid emulsion and subjected to ultrasonic cavitation treatment; s4, the wood component treated in the S3 is soaked in composite wax liquid for multi-stage progressive wax boiling treatment; s5, dewaxing, grinding and polishing treatment is conducted on the wood component treated in the S4; and S6, the wood component treated in S5 is sealed and protected. According to the technical scheme, the mirror surface effect, pore sealing, antifouling and waterproof performance, wood stability and other aspects are remarkably improved in the field of purple light wingceltis furniture surface treatment.

Description

Technical Field

[0001] This invention relates to the field of furniture surface treatment technology, and in particular to a mirror finish treatment process for purple sandalwood furniture and purple sandalwood furniture made according to this process. Background Technology

[0002] Purple rosewood (East African blackwood) is one of the densest wood components in the world, with the following notable characteristics: Its air-dry density is as high as 1.25-1.33 g / cm³. 3 It far exceeds that of ordinary rosewood components (0.8-1.0 g / cm³). 3 The heartwood is dark purplish-brown to nearly black, with fine texture and excellent luster potential. The wood fibers are extremely dense, the pores (vessels) are small but densely distributed, and it contains rich oils and gums. It requires extremely high-quality surface treatment.

[0003] Traditional surface treatment techniques for rosewood furniture have the following main drawbacks: (1) The polishing process is difficult and the mirror effect is hard to achieve. Due to the extremely high density of purple sandalwood, conventional sanding is inefficient. Moreover, due to the uneven hardness of the wood components, it is easy to over-polish or under-polish in some areas, resulting in uneven surface reflection and making it impossible to form a true mirror effect. Traditional processes usually stop at 800-1200 grit sandpaper, and the surface gloss can only reach 40-55 GU.

[0004] (2) Incomplete pore sealing: Although the pores of purple sandalwood are small, they are densely packed. Traditional hot waxing processes can only cover the surface with wax to a depth of 3-5mm, which cannot achieve deep penetration. Unsealed micropores easily absorb pollutants such as oil and tea stains during use, and the gloss decreases significantly over time.

[0005] (3) The stability of the wooden components is insufficient. Traditional drying processes cannot completely eliminate the internal stress of the wooden components. In addition, the shrinkage coefficient of purple sandalwood itself is relatively large. Finished furniture is prone to minor cracks or deformation under different temperature and humidity conditions, which affects the durability of the mirror effect.

[0006] (4) Traditional lacquer craftsmanship has limitations. Although lacquer craftsmanship can achieve a high gloss effect, it has problems such as long process cycle (usually 3-6 months), high cost, strict requirements for environmental temperature and humidity, and allergies in some people, which makes it difficult to meet the efficiency requirements of modern furniture production. Summary of the Invention

[0007] The purpose of this invention is to provide a mirror finish process for purple sandalwood furniture and purple sandalwood furniture in order to overcome the defects in the surface treatment technology of purple sandalwood furniture.

[0008] To achieve the above objectives, the present invention adopts the following technical solution: A mirror finish process for rosewood furniture includes the following steps: S1: Vacuum impregnation stabilization treatment for wooden components; S2: The wood components treated in S1 undergo a multi-stage drying-rehydration-re-drying process; S3: Immerse the wood components treated in S2 into the wax emulsion and perform ultrasonic cavitation treatment. S4: Immerse the wood components treated in S3 into a composite wax solution for a multi-stage, progressive wax boiling process; S5: Dewaxing, sanding, and polishing of the wood components treated in S4; S6; Seal the wooden components treated with S5.

[0009] Preferably, step S1 specifically includes the following steps: S1.1: Prepare the stabilizer solution; S1.2: Place the wooden components in a vacuum chamber and evacuate the vacuum. Then, while maintaining negative pressure, inject a stabilizer solution and soak for 2-4 hours. S1.3: After releasing the vacuum, continue soaking under normal pressure for 12-24 hours.

[0010] Preferably, the stabilizer solution comprises acrylic resin and refined tung oil in a mass ratio of 1:3, and an antioxidant.

[0011] Preferably, the multi-stage drying includes four stages of gradual temperature increase.

[0012] Preferably, step S3 specifically includes the following steps: S3.1: Prepare wax emulsion; S3.2: Inject the wax emulsion prepared in S3.1 into the ultrasonic impregnation tank, heat it and control the temperature at 65-70℃; S3.3: Place the wood components treated in S2 into an ultrasonic impregnation tank, ensuring that the wood components are completely submerged at least 5 cm below the surface of the emulsion. S3.4: The ultrasonic impregnation tank uses an intermittent working mode to perform ultrasonic cavitation treatment on wooden components; S3.5: Remove the wooden components treated in S3.4 and let them stand to drain.

[0013] Preferably, in step S3.4, the ultrasonic impregnation tank operates at a low-frequency ultrasonic frequency of 20-40 kHz, and the power density is set to 20-30 W / cm². 2 .

[0014] Preferably, in step S4, a composite wax liquid is used, which includes 70% by mass of microcrystalline wax, 12% of refined beeswax, 8% of carnauba wax, 5% candelilla wax, 3% natural rosin, and 2% vitamin E.

[0015] Preferably, step S5 specifically includes the following steps: S5.1: Steam dewaxing of wood components after wax boiling treatment; S5.2: The wooden components treated in S5.1 are subjected to mechanical rough grinding, manual rough grinding, and precision cutting in sequence; S5.3: Perform five-stage gradient water milling on the wood components treated in S5.2; S5.4: Perform three-stage progressive polishing on the wooden components treated in S5.3.

[0016] Preferably, step S6 specifically includes the following steps: S6.1: After S5 treatment, the surface of the wood components is coated with a nano-scale carnauba wax film with a film thickness controlled at 2-5μm; S6.2: Use a soft suede wheel to polish at a low speed of 500 r / min to ensure that the wax film is evenly distributed and fully bonded to the surface of the wood component.

[0017] This also includes purple sandalwood furniture made using the aforementioned mirror finish process.

[0018] The technical solution provided by this invention has the following significant advantages compared with traditional technical solutions: 1. By adopting a vacuum impregnation stabilization pretreatment combined with re-moistening and re-drying stress release treatment, residual stress inside the wood is effectively eliminated. After treatment, the dimensional stability and internal stress state of the purple sandalwood components are significantly improved, laying a good foundation for subsequent waxing, sanding, polishing and other processes. 2. Ultrasonic pretreatment with wax emulsion can effectively remove air and blockages from the pores of wood components, making the originally closed or semi-closed micro-channels unobstructed, which can effectively shorten the wax boiling cycle and significantly improve production efficiency. 3. By combining composite wax liquid with a multi-stage wax boiling process, the depth of wax penetration and pore sealing rate are improved, solving the problems of easy stain absorption and poor gloss durability in rosewood furniture; 4. Through rough grinding and fine grinding combined with five-stage water grinding and three-stage polishing, the surface gloss of the finished product is significantly improved, the surface roughness is reduced, and the mirror reflection image is clear and distortion-free; 5. After being sealed with a nano-wax film, it has excellent waterproof and stain-resistant capabilities, effectively resisting the erosion of pollutants such as tea stains and oil stains during daily use.

[0019] The technical solution of the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram of the process flow of the present invention. Detailed Implementation

[0021] To enable those skilled in the art to better understand the present application, the technical solutions in specific embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Unless otherwise defined, the technical or scientific terms used in this invention should have the ordinary meaning understood by those skilled in the art.

[0022] The mirror surface treatment process for rosewood furniture provided by this invention, such as... Figure 1 The following are the main steps shown: S1 Vacuum impregnation stabilization treatment → S2 Multi-stage drying-rehydration-re-drying treatment → S3 Ultrasonic cavitation treatment of wax emulsion → S4 Multi-stage progressive wax boiling treatment → S5 Dewaxing, grinding and polishing treatment → S6 Sealing treatment.

[0023] The specific embodiments of the present invention will now be described in detail in the order described above.

[0024] The specific steps for the S1 vacuum impregnation stabilization pretreatment are as follows: Mix acrylic resin and refined tung oil at a mass ratio of 1:3, add 0.5% antioxidant (vitamin E), and stir thoroughly until a uniform emulsion is formed.

[0025] Place the wooden component in a vacuum chamber and evacuate it to -0.08 to -0.095 MPa for 30 minutes to remove air from the interior. Then, while maintaining negative pressure, inject a stabilizer solution and impregnate for 2-4 hours to allow the stabilizer to penetrate the cell walls of the wooden component.

[0026] After the vacuum is released, continue soaking under normal pressure for 12-24 hours to allow the stabilizer to fully penetrate and solidify in the gaps between the wood fibers.

[0027] The core purpose of vacuum impregnation stabilization treatment is to deeply penetrate the stabilizer solution into the cell walls of wood components, fundamentally improving their dimensional stability and resistance to deformation. Although purple sandalwood has an extremely high density, wood components are essentially a porous natural polymer material. Its cell walls are mainly composed of three components: cellulose, hemicellulose, and lignin. These components contain a large number of hydrophilic groups such as hydroxyl groups. When the ambient humidity changes, the wood components absorb or release moisture, causing the cell walls to expand or contract, which macroscopically manifests as warping, cracking, and deformation of the wood components.

[0028] The physical process of vacuum impregnation can be understood in two stages. The first stage is the vacuuming stage. When the wooden component is placed in a sealed tank and a vacuum of -0.08 to -0.095 MPa is drawn, a large amount of air in the pores inside the wooden component is extracted under negative pressure. This includes air in the cell cavities, air in the gaps between the microfibrils of the cell walls, and residual gas in the vessels and pits. This process creates a large vacuum space for subsequent liquid infiltration, eliminating the obstruction of air to the liquid entry. The second stage is the impregnation stage. While maintaining negative pressure, a stabilizer solution is injected. Because the inside of the wooden component is under vacuum while the external solution is under normal or slightly positive pressure, the huge pressure difference drives the solution to rapidly enter the pores at all levels inside the wooden component. The penetration depth and volume far exceed the levels achievable by normal pressure impregnation.

[0029] This solution uses a composite stabilizer prepared by mixing acrylic resin and tung oil in a 1:3 ratio. Acrylic resin is a synthetic polymer material with a moderate molecular weight. Its molecular chain contains polar groups such as ester and carboxyl groups, which can form hydrogen bonds with the hydroxyl groups in the cell walls of wood components. After penetrating the cell walls, it can occupy the positions originally occupied by water molecules, reducing the cell walls' sensitivity to moisture. At the same time, acrylic resin has a certain degree of flexibility after curing, preventing the wood components from becoming too brittle. Tung oil is a traditional Chinese natural drying plant oil containing a large amount of conjugated trienoic acid structures. When exposed to air, it undergoes an oxidative polymerization reaction to form a tough varnish film. After penetrating the wood components, it can form a hydrophobic protective layer on the inner wall of the cell cavity and the surface of the cell wall, preventing external moisture from entering the interior of the wood components. When used in combination, the acrylic resin focuses on modifying the wood from the inside out, while the tung oil focuses on forming a sealing layer on the surface of the cell walls. This synergistic effect achieves comprehensive stabilization of the wood components. The addition of a small amount of vitamin E as an antioxidant is to prevent premature oxidation of the tung oil during storage and impregnation, maintaining the fluidity and penetrating power of the stabilizer solution. Vitamin E can capture free radicals and block the chain reaction of oxidative polymerization of tung oil, so that the tung oil gradually solidifies after entering the interior of the wood component, ensuring that the stabilizer can penetrate to a sufficiently deep location.

[0030] Following vacuum impregnation, the atmospheric pressure soaking stage applies external atmospheric pressure to the solution surface, generating a positive pressure of approximately 0.1 MPa. This pressure forces the solution further into the deeper micropores of the wood component. Simultaneously, atmospheric pressure soaking provides ample time for stabilizer molecules to diffuse into the interfibrillary spaces of the cell walls, further enhancing penetration and bonding.

[0031] The specific steps of S2 multi-stage gradient drying-rehydration-re-drying are as follows: Gradient drying consists of four stages: preheating, initial drying, intermediate drying, and final drying.

[0032] During the preheating stage, the temperature is controlled at 25℃ and the humidity at 85%, lasting for 24 hours. During the initial drying stage, the temperature is controlled at 30℃ and the humidity at 70%, lasting for 72 hours, with a target moisture content of 18%-20%. During the intermediate drying stage, the temperature is controlled at 38℃ and the humidity at 55%, lasting for 96 hours, with a target moisture content of 12%-15%. The final drying stage is controlled at 45℃ and 40% humidity for 48 hours, with a target moisture content of 10%-12%.

[0033] After drying, the wooden components are placed in an environment with 75% humidity for 48 hours to rehydrate, and then dried again to the target moisture content of 10%-12%. This effectively releases the internal stress of the wooden components and reduces the risk of deformation later.

[0034] The design of re-moistening and re-drying is based on the mechanism of internal stress formation during the drying process of wood components. During the drying process of wood components from a wet state to the target moisture content, since moisture evaporation always proceeds from the outer surface to the inside, the moisture content of different parts of the wood component is uneven at any given time. The surface layer has a low moisture content while the interior layer has a high moisture content. This moisture content gradient leads to inconsistent shrinkage in different parts of the wood component, thereby generating stress inside the wood component.

[0035] Specifically, in the initial stage of drying, surface moisture evaporates first, causing the surface wood components to shrink. However, at this time, the moisture content of the internal wood components remains high, and their volume remains essentially unchanged. Therefore, the surface shrinkage is constrained by the internal components and cannot proceed freely; the surface experiences tensile stress while the interior experiences compressive stress. As drying continues, when the moisture content of the internal wood components also begins to decrease and shrink, the surface wood components are essentially dried and shaped. At this point, the internal shrinkage is confined by the surface, and the stress distribution reverses, with the interior experiencing tensile stress and the surface experiencing compressive stress. This stress reversal phenomenon is called stress reversal in wood component drying science, and the stress remaining inside the wood component is called residual stress or drying stress.

[0036] The presence of residual stress has a serious negative impact on subsequent processing and the quality of the finished product. During machining, cutting disrupts the original stress balance, causing warping and deformation of wooden components. During use, changes in ambient temperature and humidity cause residual stress to combine with newly generated humidity stress, potentially leading to cracking of the wooden components. For rosewood furniture aiming for a mirror-like finish, even minor deformations and cracks can severely damage the surface smoothness and gloss uniformity.

[0037] The present invention employs a method of rehydrating dried wood components in an environment with 75% humidity for 48 hours. During this process, the surface of the wood components reabsorbs moisture and expands, releasing the compressive stress originally borne by the surface. Simultaneously, due to the high humidity, the moisture content gradient between the internal wood components and the surface decreases, and the internal tensile stress is partially relaxed. This process can be understood as allowing the wood components to undergo a reversible hygroscopic expansion under controlled conditions, using this expansion to offset and release the stress accumulated during the previous drying shrinkage. 75% humidity is a relatively high level that will not cause excessive moisture absorption by the wood components. At this humidity, the equilibrium moisture content of *Pterocarpus santalinus* is approximately 14%-16%, a moderate difference from the target moisture content of 10%-12% after drying. This difference is sufficient to cause surface expansion without significantly increasing the overall moisture content of the wood components. The 48-hour rehydration time ensures that moisture has enough time to diffuse into the surface to a certain depth, fully realizing the stress release effect, but without being too long, which would increase the difficulty and time cost of subsequent re-drying.

[0038] After rehydration, the wood component is dried again to the target moisture content. During this second drying process, the initial state of all parts of the wood component is more uniform, and the moisture content gradient is smaller, thus generating relatively less new stress. More importantly, after rehydration, the microfibrils and matrix materials in the cell walls of the wood component have the opportunity to rearrange and relax, releasing some of the deformations frozen during the initial drying process, and achieving a new stress equilibrium state within the wood component. This principle is similar to the annealing treatment of metal materials, where heating allows atoms to gain sufficient energy to rearrange themselves, thereby eliminating residual stress generated during processing.

[0039] The specific steps for ultrasonic cavitation treatment of S3 wax emulsion are as follows: First, prepare a wax emulsion, which includes 15%-20% wax by mass and 3%-5% emulsifier by mass. The wax is a mixture of microcrystalline wax and beeswax. The emulsifier is a mixture of food-grade glyceryl monostearate or Tween series emulsifiers. The preparation process is as follows: first, heat the mixture of wax and emulsifier to 80°C to completely melt the wax, and then slowly add deionized water at 60°C while stirring at high speed. Continue stirring until a uniform and stable oil-in-water emulsion is formed. The prepared emulsion is milky white and should not have obvious stratification after standing, with a uniform particle size distribution.

[0040] The prepared wax emulsion is added to the ultrasonic impregnation tank, which is made of stainless steel. Ultrasonic transducers are evenly distributed on the bottom and side walls. The temperature of the wax emulsion is stably controlled at 65℃ to 70℃ through a circulating heating system.

[0041] Place the dried wood components vertically into the impregnation tank, ensuring they are completely submerged at least 5 cm below the surface of the wax emulsion. Maintain appropriate spacing between components, generally no less than 5 cm, to ensure that the ultrasonic waves can evenly penetrate all surfaces of each component. The ultrasonic impregnation tank should operate at a low frequency of 20 to 40 kHz, with a power density set to 20-30 W / cm². 2 The process employs an intermittent working mode, where ultrasonic treatment lasts five minutes followed by a three-minute pause, repeated continuously. During the process, the wax emulsion needs to be slowly circulated and agitated. The state of the wax emulsion should be monitored regularly; if significant demulsification or stratification is observed, emulsifier should be added or the emulsion replaced with fresh emulsion. After each batch is processed, the emulsion can be filtered and replenished for reuse three to five times.

[0042] After ultrasonic cavitation treatment, the component is removed and left to stand and drain in a constant temperature environment of 60℃ for 2-4 hours. This allows the moisture in the emulsion remaining on the surface and in the shallow pores of the wood component to evaporate naturally, while the wax component is initially solidified and shaped in the pores, forming a thin layer of wax pre-coating.

[0043] The above steps can effectively improve the penetration rate of the next wax boiling process. The specific principle is as follows: First, there's the cavitation effect. When ultrasound propagates in a liquid medium, it undergoes periodic alternations of compression and rarefaction. When the sound pressure amplitude is sufficiently large, numerous tiny vacuum bubbles form within the liquid during the rarefaction phase. These bubbles collapse rapidly during the subsequent compression phase—this process is known as acoustic cavitation. The instantaneous collapse of these bubbles generates temperatures reaching thousands of Kelvin and pressures of hundreds of atmospheres within a very small local area, accompanied by microjets with speeds reaching hundreds of meters per second and intense shock waves. When these physical effects act on the surface of wood components, they effectively remove air, wood extracts, and other impurities that clog the ducts and fiber pores of the wood components, essentially performing a thorough unclogging and cleaning of the microscopic channels within the wood components.

[0044] Purple sandalwood, a hardwood with extremely high density, has numerous and fine vascular bundles, often containing residual resins, tannins, and other extracts that hinder the penetration of wax. Traditional waxing processes rely on high temperatures and prolonged soaking for penetration, but due to the dense structure of purple sandalwood, the resistance to wax penetration into the wood components is significant, resulting in slow penetration. By pre-treating the wood components with ultrasound before waxing, the micro-jet impact and negative pressure suction generated by cavitation effectively remove air and blockages from the pores of the wood components, opening up previously closed or semi-closed microchannels. The pre-treated wood components act like a cleaned sponge; when immersed in high-temperature wax, the wax can penetrate more smoothly along the unblocked channels, significantly improving penetration efficiency and depth. Furthermore, this process dissolves some water-soluble extracts remaining in the wood components, reducing the likelihood of these extracts precipitating and contaminating the wax during subsequent high-temperature waxing, thus helping to maintain the purity of the wax and its stability for multiple uses.

[0045] The wax emulsion formulated in this invention is a stable system formed by dispersing composite wax in the form of tiny droplets in an aqueous phase. Its temperature can be controlled within the range of 65-70℃, which is within the temperature range with high ultrasonic cavitation efficiency. At this temperature, the liquid viscosity is moderate, the vapor pressure is suitable, and the formation and collapse of cavitation bubbles are most vigorous and effective. Simultaneously, the wax droplets in the wax emulsion can be forcibly pressed into the micropores of the wood component surface under ultrasonic action, forming a preliminary wax pre-filling layer. This pre-filling layer can reduce the interfacial tension between the wax and the wood component during subsequent high-temperature wax boiling, further promoting deep penetration.

[0046] Because the internal pores of the wood components are cleared and cleaned by ultrasonic cavitation, the resistance to wax penetration is significantly reduced. This is expected to shorten the total waxing time in the next stage by 20%-30%, from approximately 50 days to 35-40 days. This significantly improves production efficiency while maintaining the same penetration depth. The pre-coating formed by ultrasonic pretreatment is equivalent to laying a guiding channel for wax penetration on the surface of the wood components. During subsequent high-temperature waxing, the resistance to wax penetration along the pre-coating is even lower, ultimately increasing the penetration depth from the original 15-22mm to 20-25mm. Furthermore, the cavitation effect of ultrasound can simultaneously act on the pores of the wood components in all directions, including axial conduits, radial rays, and tangential fiber gaps. Therefore, the penetration conditions are more uniform across all parts of the pretreated wood components, significantly improving the uniformity of wax distribution in the final product and reducing uneven gloss caused by insufficient local penetration.

[0047] Although the investment in ultrasonic pretreatment equipment and the preparation cost of emulsions have increased, the energy consumption and labor costs per unit capacity will be reduced accordingly due to the significant reduction in the wax boiling cycle. After comprehensive calculation, the total process cost is expected to be reduced by 10% to 15%. At the same time, the shorter high-temperature treatment time also means that the degree of heat aging of wood components is reduced, which is conducive to maintaining the natural color and texture characteristics of purple sandalwood and improving the overall quality of the finished product.

[0048] The S4 multi-stage progressive wax boiling process specifically includes the following steps: First, a composite wax solution is prepared, comprising 70% microcrystalline wax, 12% refined beeswax, 8% carnauba wax, 5% candelilla wax, 3% natural rosin, and 2% vitamin E by mass. Microcrystalline wax serves as the main filler material, possessing a moderate melting point and good permeability. Refined beeswax enhances adhesion and surface gloss, carnauba wax improves the hardness and abrasion resistance of the wax layer, candelilla wax improves the wax's toughness and prevents cracking, natural rosin enhances permeability and adhesion, and vitamin E acts as an antioxidant to prevent the wax from oxidizing and yellowing.

[0049] The composite wax liquid is heated and melted in a wax boiling machine (melting temperature 80-85℃). After the wax liquid temperature stabilizes, the wax boiling process is carried out in three progressive stages: Phase 1: Low-temperature pre-osmosis The temperature of the wax liquid is controlled at 85-95℃, and the wooden components are completely immersed in the wax liquid. At this stage, the wax initially penetrates into the pores of the wooden components, with a penetration depth of about 3-5mm. During this period, the components are turned over once a day to ensure that all surfaces are heated evenly.

[0050] Phase Two: Medium-Temperature Deep Penetration The wax solution is heated to 100-110℃ and subjected to intermittent pressurization at 0.15MPa, with pressure applied for 1 hour every 4 hours. This pressurization promotes deeper penetration of the wax solution into the wood components, increasing the penetration depth to 8-15mm during this stage. Simultaneously, the high-temperature environment further reduces the moisture content of the wood components.

[0051] Phase 3: High-temperature curing The temperature of the wax liquid is raised to 115-120℃ to allow the wax that has penetrated into the wood component to fully crystallize and solidify. At this stage, the final penetration depth reaches 15-22mm, and the moisture content of the wood component is controlled to be below 6%.

[0052] The S5 dewaxing, sanding, and polishing process specifically includes the following steps: First, dewaxing is performed: The product is treated with 0.4MPa, 120℃ pressurized steam for 15 minutes to thoroughly remove residual wax from the pores while retaining deep wax filling. After dewaxing, it is allowed to cool naturally to room temperature and then placed in a constant temperature and humidity environment for 72 hours to allow the deep wax to fully solidify and set.

[0053] Next, rough grinding and shaping are performed: The first step is to use mechanical coarse grinding, selecting a 120-240 mesh belt sander to perform mechanical coarse grinding, eliminating cutting marks and large unevenness on the surface of the wood components, and adjusting the dimensional tolerance of the furniture parts to ±0.5mm.

[0054] The second step involves manual rough grinding, using 320-400 grit sandpaper and a hand scraper to refine the shape, further improving the surface smoothness and controlling the dimensional tolerance to ±0.2mm.

[0055] Then, precision scraping is performed: Precision scraping is performed using a carbide scraper with a cutting edge angle of 35-40°. The scraping direction is at a 15° angle to the wood grain, and the scraping depth is 0.02-0.05mm. The surface flatness is checked using an optical flatness tester to ensure it is ≤0.05mm / m.

[0056] Then, a five-stage gradient water milling process is adopted: In the pre-grinding stage, select sandpaper with a grit of 400-600, use a 3% soapberry powder aqueous solution as the polishing medium, and polish for 15 min / dm. 2 The purpose is to even out the marks; In the initial stage, choose sandpaper with a grit of 800-1000, and use a sanding medium of 5% wood wax oil + 2% beeswax emulsion for 20 minutes per dm. 2 The purpose is to eliminate rough grinding scratches; For intermediate sanding, choose sandpaper with a grit of 1200-1500, use deionized water with 0.5% surfactant as the polishing medium, and polish for 25 minutes per dm. 2 The purpose is to improve flatness; For the fine grinding stage, select sandpaper with a grit of 2000-2500 and an olive oil emulsion with an oil-to-water ratio of 1:8 as the grinding medium. The grinding time is 30 minutes per dm. 2 The purpose is to form a mirror layer; For the ultra-fine grinding stage, select sandpaper with a grit of 3000-5000, use walnut oil microemulsion as the grinding medium, and grind for 20 minutes per dm. 2 The purpose is to eliminate microscopic scratches.

[0057] All five water-grinding stages employ a "cross-shaped + spiral" composite grinding method, which involves alternating grinding along the grain of the wood component with a 45° angle, followed by spiral grinding with a diameter of 5cm after each cycle. The grinding pressure is controlled between 0.5-1.0 kg / cm². 2 During the polishing process, the surface temperature should not exceed 35℃ to prevent the wax from softening. After each stage of polishing, the surface moisture content should be tested with a moisture meter and controlled at 6%±0.3%.

[0058] Finally, a three-stage progressive polishing process is used to further enhance the surface gloss: In the rough polishing stage, use alumina powder of 5000 mesh or higher, liquid polishing paste, sisal wheel, and a speed of 800-1000 r / min. In the intermediate polishing stage, use cerium oxide with a mesh size of 8000 or higher as the polishing powder, beeswax emulsion as the polishing agent, cotton cloth wheel as the polishing wheel material, and set the speed to 1200-1500 r / min. In the fine polishing stage, 10,000-mesh diamond micro powder is selected as the polishing powder, palm wax polishing paste is selected as the polishing agent, long-pile wool wheel is selected as the polishing wheel material, and the speed is set at 1800-2200r / min.

[0059] S6 sealing treatment specifically includes the following steps: After polishing, a nano-grade carnauba wax film is coated on the surface of the wooden component, with the film thickness controlled at 2-5μm. Then, a soft chamois wheel is used to polish at a low speed of 500r / min to make the wax film evenly distributed and fully bonded to the surface of the wooden component. The nano-wax film can form a hydrophobic protective layer on the surface of the wood, significantly improving the anti-fouling and waterproof performance. Let it stand for 24 hours.

[0060] Quality inspection points are interspersed among the above six main steps, specifically: After drying, the uniformity of moisture content was tested at multiple points using a needle moisture meter. The acceptable standard was that the deviation at each point was ≤1%. After boiling the wax, the depth of wax penetration is observed using a section microscope. The acceptable standard is 15-22 mm. After dewaxing, a dye penetration test was used to assess the pore sealing rate, with a passing standard of ≥98%. After water grinding, the surface roughness was tested using a roughness tester, and the qualified standard was Ra≤0.08μm; After polishing, the gloss was measured using a gloss meter at a 60° angle. The acceptable standard was 75-90 GU. After sealing, the hydrophobic angle is tested using a contact angle meter, and the qualified standard is ≥105°.

[0061] The following specific examples will further illustrate this point: Example 1: The long tea table made of purple sandalwood has a mirror finish.

[0062] Product specifications: Long tea table; Dimensions: 180cm (L) x 80cm (W) x 45cm (H), tabletop thickness 5cm.

[0063] Material selection: Purple sandalwood logs with a heartwood content of 95% were visually inspected and tested with ultraviolet light to confirm the absence of sapwood, cracks, and wormholes. The initial moisture content of the logs was approximately 28%.

[0064] S1: Prepare 15kg of acrylic resin and tung oil stabilizer, and add 75g of vitamin E. Place the desktop board in an 800L vacuum tank, evacuate to -0.09MPa and maintain for 30 minutes, inject stabilizer and impregnate for 3 hours, then soak at normal pressure for 18 hours.

[0065] S2 was dried in four stages: preheating (25℃ / 85% humidity / 24 hours), initial drying (30℃ / 70% humidity / 72 hours), intermediate drying (38℃ / 55% humidity / 96 hours), and final drying (45℃ / 40% humidity / 48 hours). The moisture content after final drying was 11.2%. Subsequently, a re-moistening and re-drying stress release treatment was performed, resulting in a final moisture content of 10.8%.

[0066] S3: Prepare a wax emulsion by mixing 14kg of microcrystalline wax, 2kg of refined beeswax, 600g of glyceryl monostearate, and deionized water. Transfer the prepared wax emulsion to an ultrasonic impregnation tank. Eight ultrasonic transducers with a frequency of 28kHz are evenly distributed at the bottom of the tank, with a total power of 2400W and a power density of approximately 25W / cm³. 2 The circulating heating system was activated to raise the emulsion temperature to 68℃ and maintain a stable temperature. The wooden components were then hoisted into the tank. The ultrasonic treatment was set to operate for 5 minutes and then stop for 3 minutes, constituting one cycle. Each treatment section underwent 8 complete cycles, with a total treatment time of 64 minutes. After the treatment, the wooden components were drained for 3 hours.

[0067] S4: Prepare 200kg of composite wax solution (140kg microcrystalline wax, 24kg refined beeswax, 16kg carnauba wax, 10kg candelilla wax, 6kg natural rosin, and 4kg vitamin E). The wax undergoes a 7-day low-temperature pre-penetration stage at 90℃, a 28-day medium-temperature deep penetration stage at 105℃ with intermittent pressure at 0.15MPa, and a 15-day high-temperature curing stage at 118℃. After boiling, cross-section testing shows a wax penetration depth of 18mm.

[0068] S5: Dewaxing Stage: 0.4MPa / 120℃ steam dewaxing for 15 minutes, followed by 72 hours of resting in a constant temperature and humidity chamber; Rough Grinding and Finishing Stage: 180-grit belt sander rough grinding → 320-grit manual rough grinding → carbide scraper precision scraping, cutting edge angle 38°, angle with wood grain 15°. Optical flatness test result: 0.04mm / m; Wet Grinding Stage: 600-grit sandpaper with soapberry powder aqueous solution as the polishing medium → 1000-grit sandpaper with wood wax oil and beeswax emulsion as the polishing medium → 1500-grit sandpaper with deionized water surfactant as the polishing medium → 2500-grit sandpaper with olive oil emulsion as the polishing medium → 5000-grit sandpaper with walnut oil microemulsion as the polishing medium. The entire process uses a cross-hatching + spiral grinding method, with a pressure of 0.7kg / cm². 2The surface temperature is controlled below 32℃. The surface moisture content after water grinding is 5.8%. Polishing stages: For the initial polishing stage, Zibo Bofeng brand 6000-mesh alumina polishing powder is selected, and a sisal wheel is used for polishing at a speed of 900 r / min. For the intermediate polishing stage, Anyang Jinshi brand 8000-mesh cerium oxide polishing powder is selected, and a cotton wheel is used for polishing at a speed of 1350 r / min. For the fine polishing stage, Beijing Guoruisheng brand 10000-mesh diamond micro powder is selected, and a long-staple wool wheel is used for polishing at a speed of 2000 r / min.

[0069] S6: Coated with nano carnauba wax, 3μm thick, polished with a chamois wheel at 500r / min, and left to stand for 24 hours.

[0070] Final product test results: Surface gloss: 86.2 GU (60° incident angle); Surface roughness: Ra = 0.06 μm; Hydrophobic contact angle: 112°; Pore ​​sealing rate: 99.2%; The mirror reflection image is clear and undistorted, with no exposed white skin; Total process cycle: 58 days.

[0071] Example 2: The armrests of the purple sandalwood round-back chair have a mirror finish.

[0072] Product specifications: A pair of round-back chairs with curved armrests.

[0073] The cross-sectional dimensions are approximately 6cm × 4cm, and the arc length is approximately 120cm.

[0074] Considering the small cross-section of the handrail components, the wax boiling time was appropriately shortened: 5 days for low-temperature pre-penetration, 20 days for medium-temperature deep penetration, and 10 days for high-temperature curing, totaling 35 days. The wax penetration depth reached 16mm, meeting the requirements.

[0075] Finished product test results: Surface gloss: 83.5 GU; Surface roughness: Ra = 0.07 μm; Hydrophobic contact angle: 108°; The gloss deviation of different parts of the curved surface is ≤3GU, indicating good uniformity; Total process cycle: 45 days.

[0076] Example 3: The rosewood display shelf has a mirror finish.

[0077] Product Specifications: Antique Display Shelf; Dimensions: 200cm high × 120cm wide × 40cm deep, including multiple partitions and carved decorative components.

[0078] The display shelf has a complex structure, containing numerous mortise and tenon joints and openwork carvings. The carved areas are uneven, making them difficult to reach with conventional polishing equipment.

[0079] For flat partitions, standard processes are followed. For carved components, the wax boiling stage is extended to 55 days to ensure the wax fully penetrates the carved details. Water polishing of carved areas uses specially shaped sanding blocks and cotton swab-style micro-sanding heads. Polishing of carved grooves is done manually using soft cotton rope and polishing compound. The nano-wax film is applied by spraying to ensure even coverage of the carved details. Finished product test results: Gloss level of planar areas: 85.8 GU; Gloss level of the carved areas: 78.2 GU; The overall visual effect is unified, and the carved details are clear and sharp; Total process cycle: 65 days.

[0080] This invention also protects purple sandalwood furniture made using the above-described mirror finish process.

[0081] Finally, it should be noted that the described embodiments are merely some, not all, of the embodiments of the present invention. Those skilled in the art will understand that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the claims and their equivalents; that is, all other embodiments obtained by those skilled in the art based on the embodiments of the present invention without inventive effort are within the scope of protection of the present invention.

Claims

1. A process for treating a purple sandalwood furniture mirror surface, characterized in that, The process comprises the following steps: S1: vacuum impregnation stabilization treatment of the wood component; S2: multi-stage drying-hydrating-redrying treatment of the wood component after S1; S3: ultrasonic cavitation treatment of the wood component after S2 in wax emulsion; S4: multi-stage progressive wax boiling treatment of the wood component after S3 in composite wax; S5: dewaxing, sanding and polishing treatment of the wood component after S4; S6: protective treatment of the wood component after S5.

2. The process for mirror finishing of purple sandalwood furniture according to claim 1, wherein, S1 specifically comprises the following steps: S1.1: preparation of the stabilizer solution; S1.2: vacuumizing the wood component in a vacuum tank, then injecting the stabilizer solution under negative pressure, and soaking for 2-4 hours; S1.3: releasing the vacuum, and continuing to soak for 12-24 hours under normal pressure.

3. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, The stabilizer solution comprises acrylic resin and refined tung oil in a mass ratio of 1:3, and an antioxidant.

4. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, The multi-stage drying comprises four stages of temperature gradient rise.

5. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, S3 specifically comprises the following steps: S3.1: preparation of the wax emulsion; S3.2: injecting the prepared wax emulsion in S3.1 into an ultrasonic impregnation tank, heating and controlling the temperature at 65-70℃; S3.3: placing the wood component after S2 into the ultrasonic impregnation tank, and ensuring that the wood component is completely immersed below the liquid surface of the emulsion by at least 5 cm; S3.4: ultrasonic cavitation treatment of the wood component by the ultrasonic impregnation tank in intermittent working mode; S3.5: taking out the wood component after S3.4 and standing to drain.

6. The process for treating the surface of a purple sandalwood furniture mirror according to claim 5, characterized in that, The working frequency of the ultrasonic immersion tank in S3.4 is selected as low-frequency ultrasonic wave of 20-40 kHz, and the power density is set as 20-30 W / cm 2 .

7. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, The composite wax used in S4 comprises microcrystalline wax 70%, refined beeswax 12%, Brazil palm wax 8%, candelilla wax 5%, natural rosin 3%, and vitamin E 2%.

8. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, S5 specifically comprises the following steps: S5.1: steam dewaxing of the wood component after the wax boiling treatment; S5.2: mechanical rough sanding, hand rough sanding and precision cutting of the wood component after S5.1 in sequence; S5.3: five-stage gradient water sanding of the wood component after S5.2; S5.4: three-stage progressive polishing of the wood component after S5.

3.

9. The process for mirror finishing of purple sandalwood furniture as claimed in claim 1 wherein, S6 specifically comprises the following steps: S6.1: coating a nanoscale Brazil palm wax film on the surface of the wood component after S5, with a film thickness controlled at 2-5 μm; S6.2: low-speed polishing at 500 r / min using a soft napped buffing wheel, so that the wax film is uniformly distributed and fully combined with the surface of the wood component.

10. A purpleheart furniture, characterized in that, The process is manufactured by using the mirror surface treatment process for purple sandalwood furniture according to any one of claims 1-9.

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