A processing method for removing red pigment from red oak.

Abstract

This invention belongs to the field of red oak processing technology, and specifically relates to a processing method for removing red pigment from red oak, comprising the following steps: (I) Weighing 20-35 parts by weight of aminoethanol, 15-25 parts by weight of sodium bicarbonate, 8-15 parts by weight of hydrogen peroxide, 4-8 parts by weight of ammonia, 3-6 parts by weight of tannin, and purified distilled water, and mixing them evenly to obtain a stock solution; (II) Adding the stock solution obtained in step (I) and purified water to a mixing tank in a 1:2 ratio, controlling the temperature inside the mixing tank at 15-30°C, and stirring for 25 minutes to obtain a red pigment removal agent. This invention removes the red pigment from red oak while preserving the original wood texture to the greatest extent, resulting in a more natural and authentic finished product. It solves the problem that traditional bleaching agents easily damage the texture of red oak, destroy the lignin in the wood, and cause the wood to become brittle and deteriorate.

Description

Technical Field

[0001] This invention belongs to the field of red oak processing technology, and in particular relates to a processing method for removing red pigment from red oak. Background Technology

[0002] As raw materials increase, the costs of related timber processing industries also increase, but the costs of end-use timber products are moving in the opposite direction, resulting in severe market competition, especially for the most common European oak.

[0003] Currently, in order to reduce costs, many manufacturers have focused on red oak, which is very similar to European oak in both performance and appearance, using it as a substitute. However, this leads to a problem: red oak has a reddish hue, while European oak has significantly less red pigment on its surface. Therefore, to improve the similarity between red oak and European oak, it is necessary to remove or reduce the red pigment in red oak.

[0004] However, most existing red pigment removal agents on the market use highly irritating and corrosive bleaching agents, which not only easily harm workers' health but also damage the wood. Furthermore, although bleaching improves the appearance of the wood to some extent, its use may produce harmful substances. If these substances are directly released into the environment, they may negatively impact soil, water, and air quality. Therefore, there is an urgent need to improve existing red pigment removal methods for red oak and provide a gentler, less irritating method. Summary of the Invention

[0005] The purpose of this invention is to address the shortcomings of existing technologies by providing a less irritating and corrosive, and more environmentally friendly processing method for removing red pigment from red oak, thereby solving the problems existing in the prior art.

[0006] To achieve the above objectives, the present invention adopts the following technical solution:

[0007] A processing method for removing red pigment from red oak, comprising:

[0008] Step (1): Weigh out 20-35 parts of aminoethanol, 15-25 parts of sodium bicarbonate, 8-15 parts of hydrogen peroxide, 4-8 parts of ammonia, 3-6 parts of tannin, and pure distilled water in the following proportions by mass. Mix them thoroughly to obtain the stock solution.

[0009] Step (II): Add the stock solution obtained in Step (I) and purified water to the mixing tank in a ratio of 1:2. Control the temperature inside the mixing tank at 15-30℃ and stir for 15 minutes to obtain the red pigment removal agent.

[0010] Step (3): The redness-reducing agent obtained in step (2) is injected into the storage device and kept for later use;

[0011] Step (4): Place the red oak cut veneer into the board washing machine for double-sided cleaning to thoroughly remove the sawdust produced during cutting.

[0012] Step (5): Place the cleaned red oak panel from step (4) into the steel frame, push the steel frame into the corrosion-resistant positive and negative pressure sealed tank, close the hatch, open the vacuum valve, so that the inside of the sealed tank is in a vacuum environment with a vacuum value of 0.07 MPa, and let the red oak panel stand in this vacuum environment for 40 minutes.

[0013] Step (6): Open the injection valve and inject liquid under vacuum until the pressure inside the sealed tank is the standard atmospheric pressure. Then turn on the hydraulic pump and inject the red-removing agent obtained in step (3) into the sealed tank. When the hydraulic pressure reaches 3 MPa, stop the hydraulic pressurization and soak the red oak panel in the red-removing agent.

[0014] Step (7): Remove the hydraulic pressure, and then use a self-priming pump to discharge the red-removing agent in the sealed tank into the recovery tank for recycling. After the red-removing agent is discharged, let the panels in the sealed tank stand still for 20 minutes. After the residual liquid on the surface has flowed off by itself, open the sealed tank door and take out the steel structure frame. Use a panel cleaning machine to clean the residual substances on the surface of the treated red oak panel.

[0015] Step (8): Remove the cleaned boards from Step (7) and place them on the steel structure bracket. Let them air dry at room temperature (15-20℃) until the moisture content of the red oak veneer reaches 20%. Then, place the red oak veneer in a vacuum drying kiln for further drying.

[0016] Step (nine): Sand the surface of the completely dried red oak veneer from step (eight) to obtain a red oak veneer with the red pigment removed.

[0017] In a preferred embodiment, the working pressure of the sealed tank in step (vi) is maintained at 2.7 to 3 MPa, and the external temperature of the tank is room temperature of 15 to 20°C during operation.

[0018] In a preferred embodiment, the recovery tank in step (vii) is equipped with a multi-layer activated carbon filter plate for adsorbing the color and reaction precipitates in the recovery liquid.

[0019] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0020] In the solution of this invention:

[0021] This technical solution uses a red pigment removal agent with low corrosiveness and irritation as its main components, consisting of alkali and alcohol. While removing pigment, it reduces irritation and harm to the body. Furthermore, the red pigment removal agent contains tannins and other plant substances, which not only mitigate the corrosiveness and irritation of the agent, but also fill the pores of the wood fibers with substances, thus preserving the original physical properties of the wood. While removing the red pigment from red oak, it preserves the original texture of the red oak to the greatest extent, making the finished product more natural and authentic. This solution solves the problem that traditional bleaching agents easily damage the texture of red oak and destroy the lignin in the wood, leading to brittleness and deterioration. It has a revolutionary and innovative effect on traditional red pigment removal technology.

[0022] This technology employs a recycling scheme for the prepared redness-removing pigment, achieving zero discharge and zero pollution, reducing pollution and damage to the natural environment, and better meeting the environmental protection and energy-saving requirements of various manufacturing industries in today's society. Detailed Implementation

[0023] The embodiments described below are merely some embodiments of the present invention and do not represent all embodiments consistent with the present invention. Exemplary embodiments are now described as follows:

[0024] The present invention relates to a processing method for removing red pigment from red oak wood, comprising:

[0025] Step (1): Weigh out 20-35 parts of aminoethanol, 15-25 parts of sodium bicarbonate, 8-15 parts of hydrogen peroxide, 4-8 parts of ammonia, 3-6 parts of tannin, and pure distilled water in the following proportions by mass. Mix them thoroughly to obtain the stock solution.

[0026] Step (II): Add the stock solution obtained in Step (I) and purified water to the mixing tank in a ratio of 1:2. Control the temperature inside the mixing tank at 50-60℃ and stir for 3-5 minutes to obtain the red pigment removal agent.

[0027] Step (3): The redness-reducing agent obtained in step (2) is injected into the storage device and kept for later use;

[0028] Step (4): Place the red oak cut veneer into the board washing machine for double-sided cleaning to thoroughly remove the sawdust produced during cutting.

[0029] Step (5): Place the cleaned red oak panel from step (4) into the steel frame, push the steel frame into the corrosion-resistant positive and negative pressure sealed tank, close the hatch, open the vacuum valve, so that the inside of the sealed tank is in a vacuum environment with a vacuum value of 0.07 MPa, and let the red oak panel stand in this vacuum environment for 40 minutes.

[0030] Step (6): Open the injection valve and inject liquid under vacuum until the pressure inside the sealed tank is the standard atmospheric pressure. Then turn on the hydraulic pump and inject the red-removing agent obtained in step (3) into the sealed tank. When the hydraulic pressure reaches 3 MPa, stop the hydraulic pressurization and soak the red oak panel in the red-removing agent.

[0031] Step (7): Remove the hydraulic pressure, and then use a self-priming pump to discharge the red-removing agent in the sealed tank into the recovery tank for recycling. After the red-removing agent is discharged, let the panels in the sealed tank stand still for 20 minutes. After the residual liquid on the surface has flowed off by itself, open the sealed tank door and take out the steel structure frame. Use a panel cleaning machine to clean the residual substances on the surface of the treated red oak panel.

[0032] Step (8): Remove the cleaned boards from Step (7) and place them on the steel structure bracket. Let them air dry at room temperature (15-20℃) until the moisture content of the red oak veneer reaches 20%. Then, place the red oak veneer in a vacuum drying kiln for further drying.

[0033] Step (nine): Sand the surface of the completely dried red oak veneer from step (eight) to obtain a red oak veneer with the red pigment removed.

[0034] As a preferred embodiment, based on the above structure, in step (vi), the working pressure of the sealed tank is maintained at 2.7 to 3 MPa, and the external temperature of the tank is room temperature of 15 to 20°C during operation.

[0035] As a preferred embodiment, based on the above structure, in step (vii), the recovery tank is further provided with a multi-layer activated carbon filter plate for adsorbing the color and its reaction precipitates in the recovery liquid.

[0036] The working principle of this invention is as follows:

[0037] The processing method for removing red pigment from red oak provided by the present invention involves first cleaning the red oak on both sides, then transferring the red oak into a sealed container and letting it stand in a vacuum environment of 0.07 MPa for 40 minutes. Subsequently, the prepared red pigment removal agent is injected into the sealed container, allowing the red oak to soak in the red pigment removal agent. After soaking for a certain period of time, the red pigment removal agent is discharged and the red oak is taken out and dried.

[0038] This technology employs a recycling scheme for the prepared redness-removing pigment, achieving zero discharge and zero pollution, reducing pollution and damage to the natural environment, and better meeting the environmental protection and energy-saving requirements of various manufacturing industries in today's society.

[0039] It should be noted that this technical solution uses a red pigment removal agent with low corrosiveness and irritation as the main components, consisting of alkali and alcohol. While removing the pigment, it can reduce the irritation and harm to the body. In addition, the red pigment removal agent also contains tannins and other plant substances, which can not only alleviate the corrosiveness and irritation of the agent, but also fill the pores of the wood fibers with substances, so that the original physical properties are not lost. While removing the red pigment of red oak, the original wood texture of red oak is preserved to the greatest extent, so that the finished product is not distorted and is more natural.

[0040] In summary, this technology solves the problems that traditional bleaching agents easily damage the grain of red oak, destroy the lignin in the wood, and cause the wood to become brittle and deteriorate. It has a revolutionary and innovative effect on traditional red oak removal technology.

[0041] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent changes, modifications, substitutions, and variations made by those skilled in the art based on the concept of the present invention and on the basis of the prior art through logical analysis, reasoning, or limited experiments shall be within the scope of protection defined by the claims.

Claims

1. A processing method for removing red pigment from red oak, comprising: Step (1): Weigh out 20-35 parts of aminoethanol, 15-25 parts of sodium bicarbonate, 8-15 parts of hydrogen peroxide, 4-8 parts of ammonia, 3-6 parts of tannin, and pure distilled water in the following proportions by mass. Mix them thoroughly to obtain the stock solution. Step (II): Add the stock solution obtained in Step (I) and purified water to the mixing tank in a ratio of 1:

2. Control the temperature inside the mixing tank at 15-30℃ and stir for 15 minutes to obtain the red pigment removal agent. Step (3): The redness-reducing agent obtained in step (2) is injected into the storage device and kept for later use; Step (4): Place the red oak cut veneer into the board washing machine for double-sided cleaning to thoroughly remove the sawdust produced during cutting. Step (5): Place the cleaned red oak panel from step (4) into the steel frame, push the steel frame into the corrosion-resistant positive and negative pressure sealed tank, close the hatch, open the vacuum valve, so that the inside of the sealed tank is in a vacuum environment with a vacuum value of 0.07 MPa, and let the red oak panel stand in this vacuum environment for 40 minutes. Step (6): Open the injection valve and inject liquid under vacuum until the pressure inside the sealed tank is the standard atmospheric pressure. Then turn on the hydraulic pump and inject the red-removing agent obtained in step (3) into the sealed tank. When the hydraulic pressure reaches 3 MPa, stop the hydraulic pressurization and soak the red oak panel in the red-removing agent. Step (7): Remove the hydraulic pressure, and then use a self-priming pump to discharge the red-removing agent in the sealed tank into the recovery tank for recycling. After the red-removing agent is discharged, let the panels in the sealed tank stand still for 40 minutes. After the residual liquid on the surface has flowed off, open the sealed tank door and take out the steel structure frame. Use a panel cleaning machine to clean the residual substances on the surface of the treated red oak panel. Step (8): Remove the cleaned boards from Step (7), place them on a steel structure bracket, and let them air dry at room temperature (15-20℃) until the moisture content of the red oak veneer reaches 20%. Then, place the red oak veneer in a vacuum drying kiln for further drying. Step (nine): Sand the surface of the completely dried red oak veneer from step (eight) to obtain a red oak veneer with the red pigment removed.

2. The processing method for removing red pigment from red oak according to claim 1, characterized in that: In step (vi), the working pressure of the sealed tank is maintained at 2.7 to 3 MPa, and the external temperature of the tank is 15 to 20°C during operation.

3. The processing method for removing red pigment from red oak according to claim 1, characterized in that: In step (vii), the recovery tank is equipped with a multi-layer activated carbon filter plate to adsorb the color and reaction precipitates in the recovery liquid.