CN112657809B - Wooden furniture coating method considering environmental protection and economy - Google Patents
Wooden furniture coating method considering environmental protection and economy Download PDFInfo
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- CN112657809B CN112657809B CN202011501162.5A CN202011501162A CN112657809B CN 112657809 B CN112657809 B CN 112657809B CN 202011501162 A CN202011501162 A CN 202011501162A CN 112657809 B CN112657809 B CN 112657809B
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Abstract
The invention discloses a wooden furniture coating method considering environmental protection and economy, which comprises the following steps: (1) polishing the wooden furniture blank with sand paper; (2) rolling and coating a UV primer; (3) spraying PU primer; (4) spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, and spraying a water-based finish paint after drying for 2-3 minutes; (5) drying, controlling the temperature at 40-50 ℃ and the humidity at 40-50%, and maintaining for 3-4 hours. The invention not only meets the environmental protection requirement of consumers, but also can control the production cost and improve the production efficiency.
Description
Technical Field
The invention relates to the technical field of coating methods for wooden furniture, in particular to a coating method for wooden furniture which is environmentally friendly and economical.
Background
The coating materials of the surface of the existing wooden furniture mainly comprise PU paint, UV paint, water paint and the like.
The PU paint, namely the oily paint, comprises a main agent, a curing agent and a diluent, is a general name of all polyurethane coatings, and has a natural film forming mode without a special process. The oil paint has excellent performances of corrosion resistance, water resistance, oil resistance, chemical resistance, light resistance, temperature resistance and the like, when the oil paint is coated on the surface of wooden furniture, the color, the gloss, the smoothness and the like of the oil paint can meet the requirements of consumers on the appearance of colorful furniture, and the effect of beautifying the living environment of human beings is achieved. And generally adopts the spraying mode to carry out coating, not only wastes materials, but also causes influence to the coating environment.
The UV paint is an ultraviolet light curing paint, also called as a photo-initiation paint, under the irradiation of ultraviolet light, an initiator is promoted to decompose to generate free radicals to initiate resin reaction, and is instantly cured to form a film. The UV paint is generally coated on the surface of the furniture board by automatic roller coating and spraying of mechanical equipment, so that the coating cost is low, the drying time is short, and the production efficiency is high. But the effect of the UV paint roller coating finish paint is slightly inferior to that of a PU finish paint product.
The water paint uses water as a solvent, can save a large amount of resources, is harmless to human bodies, does not pollute the environment, has a plump paint film, is glittering and translucent, has good flexibility, is used for coating wooden furniture, and has the characteristics of water resistance, wear resistance, aging resistance, yellowing resistance, quick drying, convenient use and the like. However, the price is high, and compared with oil paint, the single-component water paint has certain difference in hardness, high temperature resistance and other performances. And because the surface tension of water is large, dirt is easy to cause the film to generate shrinkage cavity, and the requirement on the cleanliness of the surface of the material in the construction process is high.
The conventional coating method includes:
60 percent of PU primer and 40 percent of water-based finish, the proportion of the PU primer is large, the PU primer needs to be sprayed for many times, and the coating efficiency is low;
40% by weight of UV primer +60% by weight of PU topcoat, the PU topcoat being directly exposed to the outside and not being environmentally friendly;
the cost of the water-based primer and the water-based finish paint is too high.
Disclosure of Invention
The invention aims to provide a wooden furniture coating method which is environment-friendly and economical, can meet the environment-friendly requirement of consumers, can control the production cost and improve the production efficiency aiming at the respective advantages and disadvantages of the coating material.
In order to achieve the purpose, the invention adopts the following technical scheme:
a wooden furniture coating method with environmental protection and economy, comprising the following steps:
(1) polishing the wooden furniture white blank with sand paper, filling the pit with wooden putty, and drying at normal temperature;
(2) rolling and coating UV primer twice each time, coating the single surface of the white blank twice, wherein the thickness of the UV primer is 18-22 square meters per kilogram, and polishing by using abrasive paper after curing and heating (a UV photocuring coating device is provided with a photocuring and abrasive paper polishing mechanism); in the step, when the white blank is an arc-shaped plate, manually coating UV primer in a rolling way; when the white blank is a flat plate, UV (ultraviolet) photocuring coating equipment is adopted for roll coating of the UV primer, but the curing of two different operation means can be realized in the UV photocuring coating equipment, the efficiency of the UV primer can be improved, and the time for drying is greatly shortened.
(3) Spraying PU priming paint, controlling the temperature at 25-30 ℃, the humidity at 50-70%, the thickness of the PU priming paint at 2-4 square meters per kilogram, and after drying, polishing the PU priming paint by abrasive paper until the surface is smooth and has no particles; the PU paint is only needed to be coated once, so that the time and the materials are saved, the PU paint is used for filling the positions where the corners are not coated after the UV primer is coated by rolling, and meanwhile, scratches and the like can be filled. The UV paint is used for replacing a part of PU paint, so that the cost is reduced, the pollution is reduced, the environment is protected, the use amount of the PU paint is reduced, the UV paint coating efficiency is high, and the whole coating time is greatly shortened.
(4) Spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours;
(5) drying, controlling the temperature at 40-50 ℃ and the humidity at 40-50%, and maintaining for 3-4 hours.
The mass ratio of the water-based color modifier to the cross-linking agent to the colored paint is 500.
The aqueous color modifier comprises 30wt% of aqueous acrylic emulsion, 68.5wt% of ethanol, 0.5wt% of defoaming agent and 1wt% of wetting agent, and the crosslinking agent is aziridine crosslinking agent. The aziridine crosslinking agent (XR-100) can react with carboxyl at room temperature, and the polyfunctional aziridine crosslinking agent is a crosslinking agent containing a carboxyl system, can be cured at room temperature and can also be cured by heating and baking, so that the water resistance, the anti-friction property, the alcohol resistance, the anti-sticking property, the adhesive force and the chemical resistance of the water paint coating can be improved. The cross-linking agent belongs to an environment-friendly cross-linking agent, no harmful substances such as formaldehyde and the like are emitted after cross-linking, and a cross-linked finished product is non-toxic and tasteless.
The defoaming agent is preferably a polyether siloxane defoaming agent or a mineral oil defoaming agent, the source of the defoaming agent is not specially required, and the defoaming agent is a commercial product, namely TEGO810 or AIREX901w from TEGO, BYK022 or BYK093 from Bike. The defoaming agent can destroy the balance between gas and liquid interfaces, and promote the bubbles to break the bubbles rapidly when the bubbles move to the liquid level, so that the phenomenon that the color modifier generates color due to the bubbles breaking out of the liquid is prevented.
The wetting agent is preferably an acrylic wetting agent, the wetting agent is not specially required by the invention, and a commercial product can be adopted, and the wetting agent in the embodiment is TEGO245 of TEGO company or Dynol604 of air products company. The wetting agent can reduce the surface tension of a paint film, so that the color modifier and the color concentrate can be effectively spread on the surface of the wood material, and the drying time is shortened.
The main component of the water-based color modifier is ethanol, the water-based color modifier is easy to volatilize and dry quickly, and can dilute colored paint, only a few drops of colored paint need to be dripped into 1 kilogram of the water-based color modifier, the colored paint is used for painting white blanks, the cross-linking agent plays a role in curing, so that the PU paint cannot volatilize, the cross-linking agent is used for spraying subsequent water-based finish paint, and otherwise, oil-water separation and separation can be realized.
The water-based finish paint is any one of acrylic acid, acrylic acid and polyurethane composition and polyurethane
Spraying PU priming paint, spraying miscella and stoving all go on in constant temperature and humidity device, and the stoving is rotatory air blowing formula stoving, the top of constant temperature and humidity device is equipped with the air energy heat pump that heaies up inside the constant temperature and humidity device and carries out the dehydrating unit of humidity regulation and control in the constant temperature and humidity device, the air energy heat pump is including being located the inside condenser of constant temperature and humidity device, be equipped with the partition wall that surrounds the condenser in the constant temperature and humidity device, one side of partition wall is equipped with the inlet port, and the opposite side of partition wall is equipped with a plurality of fans, the bottom of constant temperature and humidity device is equipped with the motor, be equipped with the pivot of making progress vertical extension on the motor, the key connection has white base frame in the pivot, white base frame includes the axle sleeve with the pivot, with the concentric a plurality of interval distribution's that set up from top to bottom frame inner ring that sets up of axle sleeve, connects through a plurality of support pole settings of circumference equipartition between two adjacent frame inner rings from top to bottom, is located and connects through the connecting rod between support pole setting and the axle sleeve below, and frame inner ring's periphery of every frame inner ring connects the frame outer loop through extension rod, white base frame outer loop, be equipped with the relative frame outer loop that the horn outlet duct is equipped with the frame that the horn outlet duct is equipped with the relative length direction on the frame that the horn outlet duct is used for shelved one by one.
Be located and be equipped with downward open-ended horn mouth along its length direction on the outlet duct of top, be located and be equipped with the upward open-ended horn mouth along its length direction on the outlet duct of below, be equipped with the horn mouth of longitudinal symmetry along its length direction on the remaining outlet duct, the switching in turn is carried out through solenoid valve control to upward open-ended horn mouth and downward open-ended horn mouth, adjacent two extension lines L1 that make progress open-ended horn mouth intersect the up end that is located the extension rod of its top, adjacent two extension lines L2 that make progress open-ended horn mouth intersect the up end that is located the extension rod of its below.
The motor in the constant temperature and humidity device rotates forwards and backwards alternately, the forward rotation time and the reverse rotation time are both 30 minutes, the bell mouth with the opening upwards is used for air outlet in the forward rotation process, and the bell mouth with the opening downwards is used for air outlet in the reverse rotation process.
The air energy heat pump further comprises an air compressor, an expansion valve and an evaporator, wherein the air compressor, the expansion valve and the evaporator are located outside the constant temperature and humidity device, the air compressor is connected with a condenser located inside the constant temperature and humidity device through a pipeline, the output end of the condenser is connected with the expansion valve through a pipeline, the output end of the expansion valve is connected with the evaporator through a pipeline, and the output end of the evaporator is connected with the air compressor through a pipeline.
Stagger the distribution from top to bottom between two adjacent outlet ducts, be connected with the stiffener between two adjacent extension rods, the axle sleeve cover is established in the pivot and is twisted the nut of pivot upper end through the spiral and compress tightly the up end of axle sleeve, one side of constant temperature and humidity device is equipped with the room door that is used for switching constant temperature and humidity device.
The white blank is a clamping plate, a density board, solid wood or a shaving board.
Compared with the prior art, the invention has the following outstanding advantages and positive effects: not only can meet the environmental protection requirement of consumers, but also can control the production cost and improve the production efficiency.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is an enlarged view taken at A in FIG. 1;
FIG. 3 is a top view of the blank frame of the present invention;
fig. 4 is a schematic view of the installation of the outlet pipe of the present invention.
In the figure: the device comprises a constant temperature and humidity device 1, a partition wall 11, a chamber door 12, an air inlet 13, an air compressor 2, a condenser 21, an expansion valve 22, an evaporator 23, a dehumidifying device 3, a fan 4, an air outlet pipe 41, a bell mouth 42, a motor 5, a rotating shaft 51, a nut 52, a shaft sleeve 6, a frame inner ring 61, a connecting rod 62, a supporting upright rod 63, a frame outer ring 64, an extension rod 65, a reinforcing rod 66 and a white blank 7.
Detailed Description
The invention is further described below with reference to specific embodiments:
as shown in fig. 1 to 4, a method for coating wooden furniture, which is environmentally friendly and economical, comprises the following steps:
(1) polishing the wooden furniture white blank 7 by using sand paper, filling a pit by using wooden putty, and airing at normal temperature;
(2) rolling and coating UV primer twice each time, passing one side of the white blank 7 twice, wherein the thickness of the UV primer is 18-22 square meters per kilogram, and polishing by using sand paper after curing and heating; the UV primer is decomposed by the initiator under the irradiation of ultraviolet light to generate free radicals, so that resin reaction is initiated, and the UV primer is instantly cured to form a film, is high and stable in curing speed and is suitable for assembly line operation.
(3) Spraying PU priming paint, controlling the temperature at 25-30 ℃, the humidity at 50-70%, the thickness of the PU priming paint at 2-4 square meters per kilogram, and after drying, polishing the PU priming paint by abrasive paper until the surface is smooth and has no particles; the UV paint and the PU paint are both oil paint.
(4) Spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours; on one hand, the water-based paint reduces the using amount of the PU paint, and the PU paint is covered in the water-based paint, so that the volatile matter of the PU paint is reduced; and secondly, the glossiness is improved, and the production efficiency is improved (after the water-based finish paint is used, the water-based finish paint can be heated and dried, and the use time is short).
The mass ratio of the water-based color modifier to the cross-linking agent to the colored paint is 500.
The aqueous color modifier comprises 30wt% of aqueous acrylic emulsion, 68.5wt% of ethanol, 0.5wt% of defoaming agent and 1wt% of wetting agent, and the crosslinking agent is aziridine crosslinking agent.
The PU primer spraying, the mixed solvent spraying and the water-based finish spraying are all carried out in the constant temperature and humidity device 1, and the steps are all carried out at the periphery of the rotary air blowing device, namely in the area outside the extension rod 65.
(5) Drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours. The drying is rotary air blowing type drying in the constant temperature and humidity device 1.
The water-based finish paint is any one of acrylic acid, acrylic acid and polyurethane composition and polyurethane
The top of constant temperature and humidity device 1 is equipped with the air energy heat pump that heaies up to constant temperature and humidity device 1 inside, the air energy heat pump is including being located the condenser 21 of constant temperature and humidity device 1 inside, the air energy heat pump still includes air compressor machine 2, expansion valve 22 and evaporimeter 23, air compressor machine 2, expansion valve 22 and evaporimeter 23 are located the outside of constant temperature and humidity device 1, and air compressor machine 2 is located the condenser 21 of constant temperature and humidity device 1 inside through the pipe connection, the output of condenser 21 passes through pipe connection expansion valve 22, the output of expansion valve 22 passes through pipe connection evaporimeter 23, the output of evaporimeter 23 passes through pipe connection air compressor machine 2. The related art of the air energy heat pump is the prior art and will not be described in detail herein.
Be equipped with the partition wall 11 that surrounds condenser 21 in the constant temperature and humidity device 1, one side of partition wall 11 is equipped with inlet port 13, and the opposite side of partition wall 11 is equipped with a plurality of fans 4, be equipped with the outlet duct 41 with fans 4 one-to-one on the partition wall 11, admit air through inlet port 13, the inlet air temperature risees to blow off through outlet duct 41.
The bottom of constant temperature and humidity device 1 is equipped with motor 5, be equipped with the pivot 51 of upwards vertical extension on motor 5, the key connection has white base frame in the pivot 51, white base frame includes axle sleeve 6 with the key-type connection of pivot 51, the frame inner ring 61 that a plurality of equidistant distributions from top to bottom that set up with axle sleeve 6 with one heart, and the key-type connection is prior art, 6 covers of axle sleeve are established on pivot 51 and are twisted the nut 52 of pivot 51 upper end through the spiral and compress tightly the up end of axle sleeve 6.
Two adjacent frame inner rings 61 are connected through a plurality of support pole setting 63 of circumference equipartition from top to bottom, are located and are connected through connecting rod 62 between the support pole setting 63 and the axle sleeve 6 of below, and a plurality of support pole setting 63 of lower extreme circumference equipartition of a frame inner ring 61 of below promptly, are connected through connecting rod 62 between axle sleeve 6 and a plurality of support pole setting 63, and connecting rod 62 has upper, middle and lower three-layer, and the intensity of white base frame has been guaranteed to multilayer connecting rod 62.
The periphery of each frame inner ring 61 is connected with a frame outer ring 64 through an extension rod 65, the white blank 7 is placed on a frame formed by the frame inner rings 61, the extension rods 65 and the frame outer rings 64, and the motor 5 rotates to drive the white blank frame to rotate.
And a bell mouth 42 for air outlet is arranged on the air outlet pipe 41 along the length direction of the air outlet pipe, and the bell mouth 42 is opposite to the white blank 7 up and down. Namely, the bell mouth 42 is discharged to directly dry the white blank 7.
A downward opening bell mouth 42 is arranged on one air outlet pipe 41 positioned above along the length direction, an upward opening bell mouth 42 is arranged on one air outlet pipe 41 positioned below along the length direction, the other air outlet pipes 41 are provided with vertically symmetrical bell mouths 42 along the length direction, and the upward opening bell mouth 42 and the downward opening bell mouth 42 are controlled by an electromagnetic valve to be opened and closed alternately. I.e., the upwardly opening flare 42 and the downwardly opening flare 42 do not operate simultaneously. Specifically, the forward rotation and the reverse rotation of the motor 5 in the constant temperature and humidity device 1 are alternately performed, the forward rotation time and the reverse rotation time are both 30 minutes, the bell mouth 42 with the upward opening is used for air outlet in the forward rotation, and the bell mouth 42 with the downward opening is used for air outlet in the reverse rotation. The upwardly open bell mouth 42 blows air against the lower end face of the white blank 7 and the downwardly open bell mouth 42 blows air against the upper end face of the white blank 7. Extension lines L1 of two adjacent upwardly open flares 42 intersect at the upper end face of the extension rod 65 located above the extension rod, and extension lines L2 of two adjacent downwardly open flares 42 intersect at the upper end face of the extension rod 65 located below the extension rod. Therefore, the upper end surface and the lower end surface of the white blank 7 can be completely blown by air, the drying effect is good, and paint is not easy to drop in the later period.
Two adjacent air outlet pipes 41 are distributed in a vertically staggered manner. The air outlet pipes 41 are ensured not to interfere with each other, and the utilization rate of the air is improved as much as possible.
A reinforcing rod 66 is connected between two adjacent extension rods 65.
And a dehumidifying device 3 for regulating and controlling the humidity in the constant temperature and humidity device 1 is arranged at the top of the constant temperature and humidity device 1. The dehumidifying device 3 is used for controlling the humidity in the constant temperature and humidity device 1 to be 40% -50%, and the constant temperature and humidity device 1 can also regulate and control the temperature, which are all the prior art and will not be described in detail herein.
And a chamber door 12 for opening and closing the constant temperature and humidity device 1 is arranged on one side of the constant temperature and humidity device 1.
The white blank 7 is a clamping plate, a density board, a solid wood or a shaving board.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.
Claims (6)
1. The wooden furniture coating method which is environmentally friendly and economical is characterized by comprising the following steps:
(1) polishing a wooden furniture white blank (7) by using sand paper to be smooth, filling a pit by using wooden putty, and airing at normal temperature;
(2) rolling and coating UV primer twice each time, and polishing the single surface of the white blank (7) twice by using abrasive paper after the UV primer is cured and heated, wherein the thickness of the UV primer is 18-22 square meters per kilogram;
(3) spraying PU priming paint, controlling the temperature at 25-30 ℃, the humidity at 50-70%, the thickness of the PU priming paint at 2-4 square meters per kilogram, and after drying, polishing the PU priming paint by abrasive paper until the surface is smooth and has no particles;
(4) spraying a mixed solvent by using a spray gun, wherein the mixed solvent comprises a water-based color modifier, a cross-linking agent and a colored paint, the temperature is controlled to be 25-30 ℃, the humidity is 50-70%, a water-based finish paint is sprayed after drying for 2-3 minutes, the thickness of the water-based finish paint is 3-5 square meters per kilogram, and the water-based finish paint is dried for 2-3 hours;
(5) drying, controlling the temperature to be 40-50 ℃ and the humidity to be 40-50%, and maintaining for 3-4 hours;
the mass ratio of the water-based color modifier to the cross-linking agent to the colored paint is 500;
the aqueous color modifier comprises 30wt% of aqueous acrylic emulsion, 68.5wt% of ethanol, 0.5wt% of defoaming agent and 1wt% of wetting agent, and the crosslinking agent is aziridine crosslinking agent;
spraying PU priming paint, spraying mixed solvent and stoving all go on in constant temperature and humidity device (1), and the stoving is rotatory air blowing formula stoving, the top of constant temperature and humidity device (1) is equipped with air energy heat pump that heaies up to constant temperature and humidity device (1) inside and carries out dehumidification device (3) that humidity regulated and control in to constant temperature and humidity device (1), the air energy heat pump is including being located inside condenser (21) of constant temperature and humidity device (1), be equipped with partition wall (11) that get up condenser (21) in constant temperature and humidity device (1), one side of partition wall (11) is equipped with inlet port (13), and the opposite side of partition wall (11) is equipped with a plurality of fan (4), the bottom of constant temperature and humidity device (1) is equipped with motor (5), be equipped with the pivot (51) of upwards vertical extension on motor (5), pivot (51) upward key joint connection has white blank frame in pivot (51), white blank frame includes axle sleeve (6) key-connected with pivot (51), the frame (61) that the interval such as the concentric a plurality of setting up and down with axle sleeve (6) sets up, support frame (61) and support the pole (61) through the circumference that two adjacent inner loop (61) support rod (61) are located between the pole (61) and every inner loop (61) and support the pole (61), the white blank (7) is placed on a frame formed by the frame inner ring (61), the extension rod (65) and the frame outer ring (64), the partition wall (11) is provided with air outlet pipes (41) which correspond to the fans (4) one by one, the air outlet pipes (41) are provided with bell mouths (42) for air outlet along the length direction of the air outlet pipes, and the bell mouths (42) are opposite to the white blank (7) up and down;
the upper end face of the extension rod (65) positioned above the upper end face is intersected with the extension lines L1 of two adjacent upward opening horn mouths (42) at the upper end face of the extension rod (65) positioned below the upper end face by the electromagnetic valve control, and the extension lines L2 of two adjacent downward opening horn mouths (42) are intersected with the upper end face of the extension rod (65) positioned below the upper end face by the electromagnetic valve control.
2. A method for coating wooden furniture, which is environmentally friendly and economical, as claimed in claim 1, wherein the water-based finish paint is any one of acrylic, acrylic and polyurethane composite, and polyurethane.
3. An environment-friendly and economical wood furniture coating method as claimed in claim 1, wherein the motor (5) in the constant temperature and humidity device (1) alternately rotates forward and backward for 30 minutes, the upward-opening bell mouth (42) gives off air when the motor rotates forward and the downward-opening bell mouth (42) gives off air when the motor rotates backward.
4. A wood furniture coating method with environmental protection and economy as claimed in claim 1, wherein the air energy heat pump further comprises an air compressor (2), an expansion valve (22) and an evaporator (23), the air compressor (2), the expansion valve (22) and the evaporator (23) are located outside the constant temperature and humidity device (1), the air compressor (2) is connected with a condenser (21) located inside the constant temperature and humidity device (1) through a pipeline, the output end of the condenser (21) is connected with the expansion valve (22) through a pipeline, the output end of the expansion valve (22) is connected with the evaporator (23) through a pipeline, and the output end of the evaporator (23) is connected with the air compressor (2) through a pipeline.
5. A wood furniture coating method with consideration of environmental protection and economy as claimed in claim 1, wherein two adjacent air outlet pipes (41) are distributed in a vertically staggered manner, a reinforcing rod (66) is connected between two adjacent extension rods (65), the shaft sleeve (6) is sleeved on the rotating shaft (51) and compresses the upper end surface of the shaft sleeve (6) through a nut (52) screwed into the upper end of the rotating shaft (51), and a chamber door (12) for opening and closing the constant temperature and humidity device (1) is arranged on one side of the constant temperature and humidity device (1).
6. An environmentally friendly and economical method of coating wooden furniture according to claim 1, characterized in that the blank (7) is plywood, density board, solid wood or particle board.
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