CN108527568A - Paulownia wood treatment process for making Chinese zither panel - Google Patents

Abstract

The present invention relates to a kind for the treatment of process of timber, in particular to a kind of paulownia wood treatment process for making Chinese zither panel, the treatment process include by paulownia timber after cooking liquor boiling processing drying and processing, and the step of repeating the above steps at least twice in vacuum drying chamber；The cooking liquor includes the raw material components of following parts by weight：100 parts of deionized water, 2~6 parts of active carbon particle, 1~5 part of water soluble chitosan, 5~10 parts of 35% hydrogen peroxide；Provided by the present invention for making the paulownia wood treatment process of Chinese zither panel, by to the immersion of paulownia timber, boiling, vacuum and low temperature drying and processing process, it prevents paulownia wood finished product from occurring damaging by worms during follow-up use, go mouldy, the bad phenomenons such as warping deformation, improving the reliability that paulownia wood finished product uses；Meanwhile treatment process provided by the invention, it is handled compared to the paulownia wood for being traditionally used for making Chinese zither panel, simplifies process, improve the treatment effeciency of paulownia wood.

Description

Paulownia treatment process for making guzheng panels

technical field

The invention relates to a wood treatment process, in particular to a paulownia treatment process for making zither panels.

Background technique

Paulownia is widely used in various fields due to its excellent characteristics. It is one of the lightest woods in China, with an air-dry density of 0.23-0.40g/cm ³ , which is about 40% lighter than ordinary wood. It is light and tough , not easy to warp deformation, beautiful texture, bright color. No matter the weather changes, musical instruments made of paulownia can stabilize the tone, so it is called "Qintong".

Guzheng, also known as Hanzheng, is a zither instrument among traditional Chinese musical instruments and belongs to the plucked string instrument. The sound quality of a guzheng depends on the panel and strings. Since ancient times, people have found through long-term research that the panel is best in the middle of the sunny side. The head and tail are the middle section, and generally 9 to 12-year-old paulownia is the best. In the prior art, the paulownia wood used to make the guzheng panel is saturated with water by soaking to facilitate the subsequent cutting process, remove the resin and gum in the paulownia wood to prevent warping and deformation during the use of the finished product, and also use the guzheng panel The method of ablating the carbonized layer on the surface is used for anti-mildew treatment, which makes the treatment process of the guzheng panel cumbersome and complicated.

Contents of the invention

Aiming at the problems in the prior art, the object of the present invention is to provide a paulownia treatment process for making zither panels, simplify the treatment process of paulownia, and ensure the service life of paulownia finished products, i.e. zither panels, prevent mildew and warp Ability to warp.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve:

A paulownia treatment process for making guzheng panels, comprising drying the paulownia material in a vacuum drying oven after being cooked with cooking liquid, and repeating the above steps at least twice;

The cooking liquid comprises the following raw material components in parts by weight: 100 parts of deionized water, 2-6 parts of activated carbon particles, 1-5 parts of water-soluble chitosan, and 5-10 parts of 35% hydrogen peroxide.

In the present invention, by cooking the paulownia wood, not only can kill insect eggs and bacteria in the paulownia wood, prevent insects and mildew from appearing in the finished product of the paulownia wood in the subsequent use process, but also can eliminate the worms and mildew in the paulownia wood. Resin and gum are fully released by hot water cooking, which avoids the problem of warping and deformation of paulownia wood products in subsequent use. By adding activated carbon particles and water-soluble chitosan to the cooking liquid, the spilled resin and Glue is absorbed to improve the overflow efficiency of resin and gum, and the addition of hydrogen peroxide can kill insect eggs and bacteria, and improve the reliability of paulownia wood products in the subsequent use process.

Among the present invention, described paulownia treatment process for making zither panel comprises the following steps:

(1) For the initial soaking, select the paulownia wood that has grown for nine years or more, remove the head and chop the tail, put it in water for 5-10 days, turn it over every 6 hours, so that the side that was originally immersed in the water is turned upside down, and the side upside down into the water on one side;

(2) Material breaking;

(3) Submerge the broken paulownia wood into the cooking liquid, heat to boiling, cook for 5-10 minutes, then lift the paulownia wood and drain the water stains;

(4) stack the paulownia wood that has been drained and water-stained into a vacuum drying oven, control the vacuum to be 0.20-0.45Mpa, and the temperature is 40-50°C, and bake until the moisture content of the paulownia wood is 11-15%. Remove the vacuum pressure, turn off the heating, and cool down to room temperature naturally;

(5) Repeat the above steps (3)-(4) at least once, and control the moisture content of paulownia wood to 5-7% at the last time, to obtain the zither panel.

During the initial soaking process, the paulownia wood material is saturated with water, which is convenient for cutting and processing; at the same time, in order to ensure the uniformity of the soaked paulownia wood material, it is turned every 6 hours during the soaking process.

After the soaking is completed, the paulownia wood material can be cut off, cut according to the requirements to obtain the specified length, width and thickness of the board, and then the broken paulownia wood material is immersed in the cooking liquid for cooking treatment, and after the cooking treatment is completed , Drain the water stains on the surface of paulownia wood, and carry out vacuum low-temperature drying treatment on it. Fully overflow in one cooking process, further reduce the content of resin and colloid in paulownia wood. In order to prevent the paulownia material from warping or cracking at high temperatures, the present invention adopts a vacuum and low-temperature drying method. In addition, this method can also improve the drying efficiency.

After repeated cooking and vacuum low-temperature drying treatment at least twice, the moisture content of the paulownia wood is controlled at 5-7%, and the treatment process of the paulownia wood can be completed to obtain the guzheng panel.

As preferably, in the step (3) of the present invention, in the process of draining the water stains on the paulownia wood, an electric blower is used to preliminarily dry the surface of the paulownia wood until there is no water stain on the surface.

Preferably, in the step (3) of the present invention, after the paulownia wood material is boiled, it is transferred to 80-90° C. hot water for 10-20 minutes, and then lifted and drained. In this way, the overflow rate of the corresponding resin and gum in paulownia wood can be improved by reducing the content of resin and gum in the soaking liquid.

Compared with the prior art, the present invention has the following technical effects:

The paulownia treatment process for making guzheng panels provided by the present invention prevents insects, mildew, warping and other defects of paulownia finished products in the subsequent use process through the soaking, cooking, and vacuum low-temperature drying process of paulownia wood materials. Phenomenon, improve the reliability of paulownia finished product use; Simultaneously, the treatment process that the present invention provides, compared with the traditional paulownia treatment that is used to make guzheng panel, has simplified operation, has improved the processing efficiency of paulownia.

Detailed ways

In order to make the technical means, creative features, goals and effects achieved by the present invention easy to understand, the present invention will be further elucidated below in conjunction with specific embodiments.

Example 1

A paulownia treatment process for making guzheng panels, comprising the following steps:

(1) For the initial soaking, select the paulownia wood that has grown for nine years or more, remove the head and chop the tail, put it in water for 8 days, turn it over every 6 hours, so that the side that was originally immersed in the water is turned upside down, and the side upside down into the water;

(2) cut off the material, cut the paulownia wood to obtain a plate of specified length, width and thickness;

(3) Submerge the broken paulownia wood into the cooking liquid, heat to boiling, cook for 8 minutes, transfer it to 85°C hot water for 15 minutes, then lift the paulownia wood, drain the water stains, and drain the paulownia wood In the process of drying water stains, the surface of paulownia wood is preliminarily dried with an electric blower until there is no water stains on the surface.

The cooking liquid includes the following raw material components by weight: 100 parts of deionized water, 5 parts of activated carbon particles (purchased from Shanghai Xitan Environmental Protection Technology Co., Ltd., model HC-ZZ04), water-soluble chitosan (purchased from Jinan Haidebei Marine Biological Engineering Co., Ltd., brand name syx001) 3 parts, 8 parts of 35% hydrogen peroxide;

(4) Stack the drained and water-stained paulownia wood material into a vacuum drying oven, control the vacuum degree to 0.30Mpa, and the temperature is 45°C, bake until the moisture content of the paulownia wood material is 13%, remove the vacuum pressure, and close Heating, naturally cooling to room temperature;

(5) Repeat the above steps (3) to (4) once, and control the moisture content of paulownia wood to 7% at the last time, to obtain the zither panel.

Example 2

A paulownia treatment process for making guzheng panels, comprising the following steps:

(1) For the initial soaking, select the paulownia wood that has grown for nine years or more, remove the head and chop the tail, and soak it in water for 10 days. Turn it over every 6 hours, so that the side that was originally immersed in the water is turned upside down, and the side upside down into the water;

(2) cut off the material, cut the paulownia wood to obtain a plate of specified length, width and thickness;

(3) Submerge the broken paulownia wood into the cooking liquid, heat to boiling, and cook for 10 minutes, then lift the paulownia wood, drain the water stains, and use an electric blower to blow the paulownia wood during the process of draining the water stains. The surface is preliminarily dried until there is no water stain on the surface,

The cooking liquid includes the following raw material components by weight: 100 parts of deionized water, 6 parts of activated carbon particles (purchased from Shanghai Xitan Environmental Protection Technology Co., Ltd., model HC-ZZ04), water-soluble chitosan (purchased from Jinan Haidebei Marine Biological Engineering Co., Ltd., brand name syx001) 5 parts, 10 parts of 35% hydrogen peroxide;

(4) Stack the drained and water-stained paulownia wood material into a vacuum drying oven, control the vacuum degree to 0.45Mpa, and the temperature is 50°C, bake until the moisture content of the paulownia wood material is 15%, remove the vacuum pressure, and close Heating, naturally cooling to room temperature;

(5) Repeat the above steps (3) to (4) once, and control the moisture content of paulownia wood to 5% at the last time, to obtain the zither panel.

Comparative example 1

The paulownia treatment process used to make the guzheng panel in this embodiment is the same as in embodiment 1, the difference is that in the cooking process of the paulownia wood material, deionized water is used as the cooking liquid, and the rest remain unchanged to obtain the guzheng panel.

Comparative example 2

The paulownia treatment process that this embodiment is used to make guzheng panel with embodiment 1 is the same, and difference is, in the present embodiment, only carry out cooking, vacuum low-temperature drying once, promptly do not have step (5), in step (4) In the vacuum low-temperature drying process, the moisture content of paulownia wood is controlled to 7%, and the rest remains unchanged to obtain the guzheng panel.

Each 3 pieces of guzheng panels obtained by above-mentioned embodiment 1-2, comparative example 1-2, 3 pieces of guzheng panels in each embodiment are numbered 1, 2, 3 successively, and guzheng panels are put into high and low temperature test chamber (purchase From the Tianjin Plinter Ring Test, model: GDW-010), the temperature is controlled at 40°C, the humidity is 60%RH, and the time is 240h. The warpage of the guzheng panel before and after being put in is tested, and the test results are recorded in the table. 1 in.

The above-mentioned warpage test is to spread the guzheng panel on a marble table, and use plug gauges to test from the four corners of the guzheng panel, and obtain the average value of the four corners as the warpage of the guzheng panel.

Table 1:

Warpage before test (mm) Warpage after test (mm) Example 1-1 0.15 0.17 Example 1-2 0.14 0.16 Example 1-3 0.15 0.16 Example 2-1 0.15 0.15 Example 2-2 0.13 0.16 Example 2-3 0.14 0.14 Comparative example 1-1 0.15 0.36 Comparative example 1-2 0.15 0.40 Comparative example 1-3 0.14 0.38 Comparative example 2-1 0.13 0.78 Comparative example 2-2 0.15 0.79 Comparative example 2-3 0.14 0.81

The basic principles, main features and characteristics of the present invention have been shown and described above. Those skilled in the industry should understand that the present invention is not limited by the above-mentioned embodiments. What are described in the above-mentioned embodiments and the description only illustrate the principle of the present invention. Without departing from the spirit and scope of the present invention, the present invention will also have Variations and improvements are possible which fall within the scope of the claimed invention. The scope of the claimed invention is defined by the appended claims and their equivalents.

Claims (4)

1. A paulownia processing technology for making zither panel, is characterized in that: comprise paulownia wood material after cooking liquid cooking treatment in vacuum drying box drying process, and repeat the step of above-mentioned steps at least twice; The cooking liquid comprises the following raw material components in parts by weight: 100 parts of deionized water, 2-6 parts of activated carbon particles, 1-5 parts of water-soluble chitosan, and 5-10 parts of 35% hydrogen peroxide. 2. the paulownia treatment process for making zither panel according to claim 1, is characterized in that: comprise the following steps: (1) For the initial soaking, select the paulownia wood that has grown for nine years or more, remove the head and chop the tail, put it in water for 5-10 days, turn it over every 6 hours, so that the side that was originally immersed in the water is turned upside down, and the side upside down into the water on one side; (2) Material breaking; (3) Submerge the broken paulownia wood into the cooking liquid, heat to boiling, cook for 5-10 minutes, then lift the paulownia wood and drain the water stains; (4) stack the paulownia wood that has been drained and water-stained into a vacuum drying oven, control the vacuum to be 0.20-0.45Mpa, and the temperature is 40-50°C, and bake until the moisture content of the paulownia wood is 11-15%. Remove the vacuum pressure, turn off the heating, and cool down to room temperature naturally; (5) Repeat the above steps (3)-(4) at least once, and control the moisture content of paulownia wood to 5-7% at the last time, to obtain the zither panel. 3. the paulownia treatment process that is used to make guzheng panel according to claim 2 is characterized in that: in step (3), in the process that paulownia wood drains water stain, adopts electric blower to carry out preliminary drying to the paulownia wood surface Dry until its surface is free of water spots. 4. The paulownia treatment process for making the guzheng panel according to claim 2, characterized in that: in the step (3), after the paulownia wood material is boiled, it is transferred to 80～90°C hot water and soaked for 10 ~ 20min, then lifted and drained.