CN105019305A - Continuous deacidifying system - Google Patents

Abstract

The invention provides a continuous deacidifying system. The system comprises a deacidification agent atomizing device which comprises a deacidification agent tank, an atomization generating mechanism and a sprinkler for applying a deacidification agent to a to-be-deacidified sample; a radio frequency discharge device which comprises a discharge electrode, a grounding electrode and a matched circuit, wherein the grounding electrode is made from a flexible material and is wound as a conveyor belt for bearing the to-be-deacidified sample; and a driving device for driving the discharge electrode and the sprinkler so as to change the position relative to the conveyor belt. The continuous deacidifying system for treating samples at normal temperature and normal pressure is safe to use and free of pollution to external environment, is simple in structure and convenient to use, is short in treatment time, thorough in deacidification and difficult to return acid, effectively prevents the sample from being deformed and discolored, and can be used for realizing continuous treatment of the to-be-deacidified sample and is suitable for industrialized large-scaled application.

Description

A continuous deacidification system

technical field

The invention relates to a deacidification system, in particular to a system for continuous deacidification treatment using plasma discharge technology.

Background technique

my country is an ancient civilization with a long history and splendid culture. The invention of papermaking and printing records the development of human civilization. There are tens of thousands of precious modern books, calligraphy and paintings, newspapers, archives and other paper cultural relics preserved in various libraries, museums and archives institutions in our country. Historical and cultural value is the pillar of the spiritual civilization of the Chinese nation.

However, with the passage of time, the acidification of paper documents has become more and more serious, and a large number of ancient rare books have become yellow, moldy, pulverized and fragmented. The protection of these cultural materials is facing severe challenges. A large number of modern paper cultural relics are discolored due to acidification of the paper, and the mechanical strength is greatly reduced or even broken at the touch of a touch.

Paper cultural relics can be roughly divided into traditional handmade paper and modern machine-made paper in terms of texture. It is generally believed that the main chemical component of paper is cellulose, which is composed of glucose bonds between base rings in cellulose macromolecules. The aluminum sulfate retained in the manufacturing process of machine-made paper is acidic after being hydrolyzed. When it acts on the paper cellulose, the glucose bond between the base rings in the cellulose macromolecule is broken, resulting in a decrease in the degree of polymerization, which leads to acidification of the paper, It is brittle and deteriorated, manifested as macroscopic discoloration and microscopic structural damage (that is, a decline in mechanical strength) and "self-destruction". In the traditional handmade paper cultural relics that are generally considered not easy to acidify, obvious acidification phenomena of varying degrees have also been found.

A large number of experiments have shown that modern machine-made paper generally only has a lifespan of 50 to 60 years, and its theoretical "lifetime" after deacidification can reach about 500 years. However, under the continuous influence of external acidification factors such as the lignin oxidation and hydrolysis of the paper itself, and the atmosphere, the deacidified paper may still have the phenomenon of "acid regurgitation" after long-term storage.

At the same time, due to the dyeing process, anti-wrinkle treatment, washing resistance treatment and other reasons, a large amount of acid is also used in the production process of fiber fabrics. Therefore, there is also obvious acidification phenomenon in the fiber fabric.

Although people have carried out a lot of research on paper deacidification in modern times, the ideal deacidification technology has not been obtained so far. The traditional solution deacidification method needs to immerse the sample to be treated in the deacidification agent, which leads to various defects that are difficult to overcome, such as paper deformation, fading, toxicity of chemical reagents, low efficiency, multi-level treatment, and difficult to control deacidification The amount of agent used and the prevention of acid reflux, etc.; while the traditional meteorological deacidification method is fast and has the comprehensive effect of killing insects and disinfecting, but the acquisition of high vacuum conditions leads to very strict requirements for equipment, many unsafe hidden dangers, and investment Large and difficult to prevent acid reflux disadvantages. Therefore, it is urgent to study new, efficient, and industrialized deacidification theory and technology for large-scale paper treatment.

The particles contained in the atmospheric pressure non-equilibrium plasma have high energy and strong activity, which can effectively bring the alkaline deacidification agent in the water vapor into the interior of the fiber to completely deacidify the paper from the inside to the surface, thereby preventing incomplete deacidification. The acidic substances remaining inside the fiber can still accelerate the degradation of the fiber. This method can not only get rid of the limitation of vacuum conditions in traditional physical methods, but also overcome the negative effects brought by solvent-based chemical reagent treatment methods. Moreover, the temperature of the plasma can be as low as normal temperature without causing damage to the paper. It can not only get rid of the limitation of the vacuum condition in the traditional physical method, but also overcome the negative effect brought by the treatment method of the soluble chemical reagent. Therefore, plasma can be used to introduce high-energy active hydroxide ions into the surface and interior of the paper, and neutralize the acidic substances in the paper to achieve non-contact plasma deacidification of paper documents. Increase the bonding force between fibers to improve the macroscopic strength of paper.

The Chinese patent document with publication number CN102242530A discloses a method for deacidifying paper cultural relics. Its equipment requirements are high and continuous deacidification cannot be realized, the production efficiency is low, and it is not suitable for large-scale production.

Contents of the invention

The invention provides a continuous deacidification system. The continuous deacidification system treats samples at normal temperature and pressure, which is safe to use and has no pollution to the external environment; Continuous processing of deacidified samples is suitable for large-scale industrial applications.

Technical scheme of the present invention is as follows:

A continuous deacidification system comprising:

A deacidification agent atomization device, including a deacidification agent tank connected in sequence, an atomization mechanism, and a nozzle for applying the deacidification agent to the sample to be deacidified;

The radio frequency discharge device includes a discharge electrode, a ground electrode and a matching circuit, the ground electrode is made of a flexible material and is wound around a conveyor belt for carrying samples to be deacidified;

The driving device is used to drive the discharge electrode and the nozzle to change the relative position to the conveyor belt.

In the present invention, the sample to be deacidified is paper or fiber fabric, and generally the thickness is not large, otherwise the plasma is difficult to penetrate.

The deacidification agent is Mg(HCO ₃ ) ₂ aqueous solution, Ca(OH) ₂ aqueous solution, etc. As far as the deacidification agent itself is concerned, existing technologies can be used.

The ground electrode is made of conductive metal materials such as copper and aluminum. As far as the ground electrode itself is concerned, existing technologies can be used.

Between the discharge electrode and the ground electrode is a discharge area for processing the sample to be deacidified.

The driving device enables the operator to adjust the position of the discharge electrode and the nozzle according to the different sizes and positions of the sample to be deacidified, mainly the distance between the nozzle and the discharge electrode and the sample to be deacidified, which also affects the effect of deacidification.

The working process of the continuous deacidification system is as follows: first, the conveyor belt places the sample to be deacidified at the nozzle, and the atomization mechanism atomizes the deacidification agent, for example, by means of ultrasonic atomization, and sprays it on the nozzle to be deacidified. Deacidify the surface of the sample; then, the conveyor belt places the sample to be deacidified in the discharge area, and the radio frequency discharge generates plasma for deacidification.

The high-energy and highly active plasma generated by radio frequency discharge can effectively bring the deacidification agent attached to the surface of the sample to be deacidified into the fiber of the sample to be deacidified, so that the sample to be deacidified can be efficiently and completely absorbed from the inside to the surface. Thorough deacidification, thus realizing non-contact deacidification. Through non-contact deacidification, it can effectively avoid the occurrence of deformation and discoloration caused by the large-scale contact of the sample with water or other reagents. By controlling the amount of deacidification agent sprayed, the pH of the sample after deacidification can be controlled in an appropriate range, making it moderately alkaline, effectively avoiding the occurrence of acid reflux, and prolonging the life of the sample. The deacidification system works under the conditions of normal temperature and pressure, and has simple structure and convenient use. The deacidification agent is a conventional non-toxic deacidification agent and will not pollute the environment. The sample to be deacidified after being treated by the above deacidification system has no obvious color difference from the initial one, and the mechanical strength is slightly improved. The flexible ground electrode is wound around to form a conveyor belt, which can realize continuous processing of samples to be deacidified, and is suitable for large-scale industrial application.

Preferably, the outer surface of the conveyor belt is covered with an insulating layer.

The insulating layer is made of insulating materials such as plastics, polymer materials, glass, and ceramics. As far as the insulating layer itself is concerned, existing technologies can be used.

Generally, the insulating layer is relatively thin, and it can be effectively supported by sticking it on the outer surface of the conveyor belt.

Preferably, along the running direction of the conveyor belt, the spray head is arranged upstream, and the discharge electrode is arranged downstream.

The above-mentioned continuous deacidification system is easy to operate. After the operator places the sample to be deacidified on the upstream of the conveyor belt, the sample to be deacidified will receive the deacidification agent through the nozzle and the discharge area for deacidification in turn under the action of the conveyor belt. The entire deacidification process is completed at one time. , high deacidification efficiency and labor saving.

Preferably, the driving device is a first manipulator and a second manipulator capable of three-dimensional movement, the spray head is installed on the first manipulator, and the discharge electrode is installed on the second manipulator.

The manipulator capable of three-dimensional movement enables the operator to adjust the position of the nozzle and the discharge electrode according to the different sizes and positions of the samples to be deacidified, so that the deacidified agent is fully attached to the sample to be deacidified, and the sample to be deacidified is completely in the discharge area Inside, and the discharge electrode and the nozzle can move back and forth laterally to process the sample to be deacidified in a linear scanning mode, so as to deacidify it efficiently. At the same time, the manipulator has high precision and can be positioned accurately.

Preferably, the atomization mechanism is an ultrasonic atomizer.

Ultrasonic nebulizers use electronic high-frequency oscillations to break up the molecular structure of liquid water to generate water mist through the high-frequency resonance of ceramic atomizers, without heating or adding any chemical reagents. Compared with the heating atomization method, the energy saving is 90%.

Preferably, an atomization box is also provided, the spray head is located in the atomization box, and the bottom of the atomization box is open and faces the upper surface of the conveyor belt.

The upper surface of the conveyor belt refers to the surface of the conveyor belt carrying the sample to be deacidified.

The spray box can effectively control the spraying range of the deacidification agent so as not to affect other equipment or processes.

Preferably, a first support and a first lifting platform moving along the first support are also provided, the spray head is installed on the first lifting platform, and the driving device is a first lifting motor for driving the first lifting platform.

The above structure can realize the movement of the nozzle relative to the sample to be deacidified, so as to adapt to the samples to be deacidified in different sizes and positions, and improve the deacidification efficiency.

Further preferably, a second support and a second lifting platform moving along the second support are also provided, the discharge electrode is installed on the second lifting platform, and the deacidification system is also provided with a motor for driving the second lifting platform. Second lift motor.

The above structure can realize the movement of the discharge electrode relative to the sample to be deacidified, so as to adapt to the samples to be deacidified in different sizes and positions, and improve the efficiency of deacidification.

The beneficial effects of the present invention are:

1. The deacidification system of the present invention can realize continuous deacidification and can be industrially processed on a large scale.

2. The present invention is simple in structure and easy to operate. The sample to be deacidified is processed at normal temperature and pressure, and has no high requirements on external temperature, pressure and other conditions. It does not need to use toxic deacidification agents and has no pollution to the environment.

3. Using the present invention to carry out deacidification treatment requires short time, complete deacidification and is not easy to regurgitate acid.

4. Using the present invention for deacidification treatment effectively avoids the occurrence of deformation, discoloration, etc. caused by the large-area contact of the sample to be deacidified with water or other reagents.

5. Using the present invention to carry out deacidification treatment can effectively control the amount of deacidification agent, control the pH of the sample after deacidification in an appropriate range, make it moderately alkaline, effectively avoid the occurrence of acid reflux, and prolong the Sample life.

6. There is no obvious color difference between the sample treated by the present invention and the initial state, and the mechanical strength is slightly improved.

Description of drawings

Fig. 1 is a schematic structural diagram of an embodiment of the present invention.

Detailed ways

The present invention will be further described below in conjunction with the accompanying drawings and embodiments.

The continuous deacidification system of this embodiment includes a deacidification agent atomization device, a radio frequency discharge device and a driving device.

The deacidification agent atomization device includes a deacidification agent tank 1 , an atomization generating mechanism 2 and a nozzle 3 connected in sequence.

The radio frequency discharge device includes a discharge electrode 7, a ground electrode 8 and matching circuits. The ground electrode 8 is made of copper and is wound around as a conveyor belt for carrying samples to be deacidified;

The driving device includes a first lifting motor 13 for driving the first lifting platform 4 and a second lifting motor 14 for driving the second lifting platform 11 .

The atomization generating mechanism 2 is an ultrasonic atomizer.

The insulating layer 10 is made of PE and is pasted on the outer surface of the ground electrode 8 .

The spray opening of the spray head 3 is in the shape of a slit and is located in the atomization box 6, and the bottom of the atomization box 6 is open and faces the upper surface of the conveyor belt.

Through the back and forth movement of the conveyor belt formed by the ground electrode 8, the nozzle 3 and the discharge electrode 7 can be displaced relative to the sample to be deacidified, thereby scanning the surface of the sample to be deacidified, so that the surface can fully absorb the deacidified agent and make the plasma fully The deacidification agent is brought into the inside of the fiber to completely deacidify the sample to be deacidified from the inside to the surface.

The first lifting motor 13 is fixedly installed on the first bracket 5, and drives the first lifting platform 4 to lift through the ball screw structure. The spray head 3 is fixedly installed on the first lifting platform 4, and can rise and fall with the lifting of the first lifting platform 4, thereby adjusting the distance between the spray head 3 and the sample to be deacidified.

The second lifting motor 14 is fixedly installed on the second bracket 12, and drives the second lifting platform 11 to lift through the ball screw structure. The discharge electrode 7 is fixedly installed on the second lifting platform 11, so as to adjust the distance between the discharge electrode 7 and the sample to be deacidified.

The control computer 15 is used to control the respective lifting heights of the first lifting motor 13 and the second lifting motor 14 .

The working process of this embodiment is as follows:

1. According to the size of the sample to be deacidified, adjust the height of the nozzle 3 and the discharge electrode 7 through the control computer 15;

2. Put the sample to be deacidified from the inlet 16, and transfer it to the atomization box 6 by the conveyor belt formed by the ground electrode 8;

3. Mg(HCO ₃ ) ₂ aqueous solution with a pH of 8.2 is injected into the deacidification agent tank 1 , and atomization treatment is performed using the atomization generating mechanism 2 . The grounding electrode 8 moves back and forth around the conveyor belt, the spray head 3 moves and scans the sample to be deacidified in a full range, sprays the atomized deacidification agent on the sample to be deacidified at a flow rate of 150mL/h, and the spraying time is 30s ;

4. After spraying, the conveyor belt formed by the ground electrode 8 will transfer the sample to be deacidified to the discharge area;

5. Turn on the radio frequency power supply 9, adjust the current to 0.15A, and the voltage to 75V to form a stable blue-purple linear filamentary plasma. The ground electrode 8 moves back and forth around the conveyor belt formed, and the plasma performs a full range of deacidification of the sample to be deacidified. Mobile scanning, the scanning time is 1min, that is, the deacidification process is completed.

Using the deacidification system of this embodiment, the sample to be deacidified can be continuously deacidified, and the deacidification efficiency is high and the effect is good.

The above only lists the structure of a common continuous deacidification system, and all other embodiments obtained by those of ordinary skill in the art without creative efforts fall within the protection scope of the present invention.

Claims (8)

1. a continuous deacidification system, is characterized in that, comprising:

Deacidification agent atomising device, comprises the deacidification agent tank, the atomization generating mechanism and for treating that depickling sample applies the shower nozzle of deacidification agent that are communicated with successively;

Radio frequency discharge device, the circuit comprising sparking electrode, earth electrode and match, described earth electrode is flexible material and becomes for carrying the conveyer belt treating depickling sample around the home;

Drive unit, for driving sparking electrode and shower nozzle to change the relative position with conveyer belt.

2. continuous deacidification system according to claim 1, is characterized in that, conveyer belt outer surface is covered with insulating barrier.

3. continuous deacidification system according to claim 1 and 2, is characterized in that, along conveyer belt traffic direction, described shower nozzle is arranged on upstream, and sparking electrode is arranged on downstream.

4. continuous deacidification system according to claim 3, is characterized in that, described drive unit is can the first manipulator of three-dimensional motion and the second manipulator, and described shower nozzle is arranged on the first manipulator, and described sparking electrode is arranged on the second manipulator.

5. continuous deacidification system according to claim 3, is characterized in that, described atomization generating mechanism is ultrasonic atomizatio machine.

6. continuous deacidification system according to claim 3, is characterized in that, be also provided with atomization box, and described shower nozzle is in atomization box, open and towards conveyer belt upper surface bottom atomization box.

7. continuous deacidification system according to claim 1, it is characterized in that, also be provided with the first support and the first lifting platform along the first support motion, described shower nozzle is arranged on the first lifting platform, and described drive unit is the first lifting motor for driving the first lifting platform.

8. continuous deacidification system according to claim 7, it is characterized in that, also be provided with the second support and the second lifting platform along the second support motion, described sparking electrode is arranged on this second lifting platform, and described deacidification system is also provided with the second lifting motor for driving the second lifting platform.