Method and apparatus for uniform deacidification of extra-thick paper

Abstract

The application discloses a uniform deacidification method and deacidification device for extra-thick paper, which comprises the following steps: pretreating the extra-thick paper to be deacidified; performing a mist moistening deacidification operation on the pretreated extra-thick paper; keeping the humidity and temperature around the extra-thick paper unchanged during the mist moistening deacidification operation; and keeping the humidity and temperature around the extra-thick paper unchanged after the pH of the extra-thick paper reaches a preset value. Through the humidification and heat preservation pretreatment of the paper, the capillary pores of the paper can absorb part of the water, so as to open the gap between the capillary pores, thereby helping the deacidification agent to penetrate into the deep part of the paper. Meanwhile, the humidity and temperature around the paper are monitored and adjusted, so that the paper is always in the state of being most easy to absorb the deacidification agent, and the deacidification agent paper cross-section direction conveying channel is effectively formed, thereby ensuring that the deacidification agent can uniformly penetrate into the interior of the paper even for the extra-thick paper.

Description

Technical Field

[0001] This invention relates to the field of paper deacidification and preservation technology, and particularly to a method and apparatus for uniform deacidification of extra-thick paper. Background Technology

[0002] Paper acidification accelerates paper aging, and removing acidic substances from paper is crucial for extending its lifespan. Currently, acidified paper is treated with deacidifying agents to neutralize the existing acid, leaving a certain amount of alkali residue. Two common deacidification methods are gas-phase and liquid-phase. Gas-phase methods use gases that are mostly harmful to humans, and the alkali residue after deacidification is relatively low. Liquid-phase methods are further divided into aqueous solutions and organic solvents. Organic solvent methods, also known as anhydrous deacidification, use an organic solvent suspension (turbidity) of nano-magnesium oxide. Because this process is prone to agglomeration and precipitation during storage, and the organic solvent evaporates quickly during deacidification, the nano-magnesium oxide forms micron-sized alkaline particles upon reaching the paper surface. These particles struggle to penetrate deep into the paper (especially thicker paper), leading to incomplete neutralization and deacidification. Besides the excessive alkali powder remaining on the paper surface damaging the paper, the dust from the paper surface is toxic when inhaled, and the solvents and dispersants are also toxic. Traditional aqueous (alkaline) deacidification is non-toxic, harmless, and inexpensive. The alkaline substances dissolved and dispersed in water can penetrate into the paper, achieving uniform and thorough deacidification. However, aqueous deacidification also has some drawbacks: prolonged soaking can easily deform the paper, causing significant damage, and water-soluble ink can easily bleed, diffuse, and fog. Summary of the Invention

[0003] In view of this, the present invention proposes a method and apparatus for uniform deacidification of extra-thick paper, which can effectively avoid the problems of fading and bleeding that easily occur during the deacidification of water-soluble and oil-soluble dyes. The present invention provides the following technical solution: a method for uniform deacidification of extra-thick paper, the method comprising:

[0004] Pre-treatment of extra-thick paper to be deacidified is performed to achieve pre-humidification and heat preservation;

[0005] The pretreated extra-thick paper is subjected to a mist wetting and deacidification process to bring the pH of the extra-thick paper to the preset value.

[0006] During the aforementioned mist deacidification operation, the humidity and temperature around the extra-thick paper are kept the same as during the pretreatment.

[0007] After the pH of the extra-thick paper reaches the preset value, the humidity and temperature around the extra-thick paper are kept constant, effectively forming a deacidifying agent transport channel in the paper cross-section direction, ultimately achieving complete neutralization reaction and thorough deacidification of the extra-thick paper.

[0008] Furthermore, the method for pre-treating the extra-thick paper to be deacidified, achieving pre-humidification and heat preservation, includes:

[0009] Place the extra-thick paper to be deacidified in a sealed space;

[0010] Humidification and heat preservation are carried out in enclosed spaces, and the temperature and humidity are kept constant to achieve pre-humidification and heat preservation of extra-thick paper.

[0011] Furthermore, the method for ensuring that the humidity and temperature of the extra-thick paper are the same as those during pretreatment during the mist deacidification operation includes:

[0012] During the aforementioned mist-wetting deacidification operation, the humidity and temperature around the extra-thick paper are monitored in real time.

[0013] When the humidity is higher than the humidity during pretreatment, the humidification effect is reduced; when the humidity is lower than the humidity during pretreatment, the humidification effect is increased to keep the humidity the same as the humidity during pretreatment.

[0014] When the temperature is lower than the pretreatment temperature, heat the area around the paper. When the temperature is higher than the pretreatment temperature, stop heating the area around the paper to maintain the temperature at the same level as the pretreatment temperature.

[0015] Furthermore, before pre-treating the extra-thick paper to be deacidified, and before pre-humidifying and heat-insulating it, the method further includes:

[0016] Plasma scanning is performed on the surface of extra-thick paper to activate the surface of the extra-thick paper.

[0017] Furthermore, after the pH of the extra-thick paper reaches a preset value, the humidity and temperature around the extra-thick paper are kept constant to effectively form a deacidifying agent transport channel in the paper cross-section direction, ultimately achieving complete neutralization of the extra-thick paper. After thorough deacidification, the method further includes:

[0018] Stop maintaining humidity and temperature;

[0019] The extra-thick paper after deacidification is ventilated and dried.

[0020] This invention further discloses a uniform deacidification device for extra-thick paper, used to achieve the above-mentioned deacidification method, comprising:

[0021] A sealable or openable frame, wherein a deacidification machine for deacidifying the extra-thick paper is provided inside the frame;

[0022] Multiple sets of humidity and temperature sensors are installed around the deacidifier to monitor the humidity and temperature around the extra-thick paper in real time.

[0023] The humidifier and heating device are installed within the frame and are communicatively connected to multiple sets of humidity sensors and temperature sensors to regulate the humidity and temperature around the extra-thick paper.

[0024] Furthermore, the frame includes a frame and multiple plates, the multiple plates are mounted on the frame, and at least one plate is closably connected to the frame.

[0025] Furthermore, the deacidifier is connected to a container containing a deacidifying agent for deacidifying extra-thick paper.

[0026] Furthermore, the deacidifying agent is an alkaline deacidifying agent.

[0027] Furthermore, the alkaline substance contained in the alkaline aqueous deacidifying agent is one or more of calcium hydroxide, calcium bicarbonate, magnesium bicarbonate, calcium carbonate, magnesium carbonate, and tetraborate.

[0028] According to the technical solution of the present invention, by pre-treating the paper with humidification and heat preservation, the paper capillaries can absorb some moisture, thereby opening the gaps between the capillaries, which helps the deacidifying agent to penetrate deep into the paper. At the same time, by monitoring and regulating the humidity and temperature around the paper, the paper is always in a state that is most conducive to absorbing the deacidifying agent, effectively forming a deacidifying agent transport channel in the paper cross-section direction. This ensures that even for extra-thick paper, the deacidifying agent can penetrate evenly into the paper interior, so that the neutralization reaction of the paper to be deacidified is complete, and the deacidification is thorough. Attached Figure Description

[0029] For illustrative and not limiting purposes, the present invention will now be described in conjunction with embodiments and accompanying drawings, wherein:

[0030] Figure 1 This is a schematic flowchart of the method for uniform deacidification of extra-thick paper according to an embodiment of the present invention.

[0031] Figure 2 This is a schematic diagram of the structure of the uniform deacidification device for extra-thick paper in an embodiment of the present invention.

[0032] In the diagram: 1. Frame; 11. Sheet metal; 2. Deacidification machine; 21. Container; 3. Humidity sensor; 4. Temperature sensor; 5. Humidifier; 6. Heating equipment; 7. Controller. Detailed Implementation

[0033] To enable those skilled in the art to better understand the present application, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative effort should fall within the scope of protection of the present application.

[0034] It should be noted that the terms "first," "second," etc., in the specification and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for the embodiments of this application described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that includes a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0035] In this application, the terms "upper," "lower," "left," "right," "front," "rear," "top," "bottom," "inner," "outer," "middle," "vertical," "horizontal," "lateral," and "longitudinal" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for the purpose of better describing this application and its embodiments, and are not intended to limit the indicated device, element, or component to having a specific orientation, or to be constructed and operated in a specific orientation.

[0036] Furthermore, some of the aforementioned terms, besides indicating location or positional relationships, may also have other meanings. For example, the term "above" may, in certain circumstances, indicate a dependency or connection. Those skilled in the art can understand the specific meaning of these terms in this application based on the specific circumstances. Additionally, the term "multiple" should mean two or more.

[0037] It should be noted that, where there is no conflict, the embodiments and features of the embodiments in this application can be combined with each other. The embodiments of this application will be described in detail below with reference to the accompanying drawings.

[0038] Extra-thick paper is widely used in book covers and calligraphy / painting paper. This embodiment uses paper with a thickness greater than 0.15 mm or a basis weight greater than 120 g / m³. 2 Taking paper as an example, traditional deacidification methods have difficulty delivering deacidification factors to the inside of the paper, and may even cause uneven deacidification inside and outside the paper, or even acid reversion in the paper.

[0039] refer to Figure 1 This embodiment discloses a method for uniformly deacidifying extra-thick paper, the deacidification method comprising the following steps:

[0040] S100: Perform plasma scanning on the surface of extra-thick paper to activate the surface of the extra-thick paper.

[0041] When the solution of the present invention is applied to paper that needs to be stored for a long time or to repair old paper, the surface of the paper is usually severely aged and dehydrated or covered with impurities that cannot be cleaned. In order to provide a better initial operation effect for subsequent paper deacidification operation, the surface of the paper can be scanned by plasma. The high-energy particles of plasma can be used to change the chemical and physical properties of the paper. For example, the hydrophilicity of the paper surface can be enhanced.

[0042] S200: Pre-treats extra-thick paper to be deacidified, achieving pre-humidification and heat preservation.

[0043] Due to the long-term storage of extra-thick paper and its inherent physical properties, the capillary pores on the surface and inside of extra-thick paper are very small. If deacidifying agent is sprayed on extra-thick paper at this time, it will cause the deacidifying agent to form a tension film between the capillary pores of the paper, and the deacidifying agent cannot penetrate into the interior of the extra-thick paper. Even if it is sprayed from both sides of the paper, there will be incomplete penetration.

[0044] In this case, when the paper is exposed to appropriate humidity and temperature, the paper capillaries can expand appropriately after being moistened, the gaps between the capillaries will also increase, and the paper's toughness can be improved during the expansion.

[0045] In this embodiment, step S200 is implemented by:

[0046] S210: Place the extra-thick paper to be deacidified in a sealed space. A sealed space can prevent the external environment from interfering with the environment of the extra-thick paper to be deacidified. For example, dry air will further increase the difficulty of deacidification of the paper, and too low air temperature will cause the capillaries of the paper to not fully open after absorbing water.

[0047] S220: Humidification and heat preservation are performed in a sealed space, and the temperature and humidity are controlled to remain constant to achieve pre-humidification and heat preservation of extra-thick paper. Due to the presence of a sealed space, the desired effect can be achieved accurately and quickly when controlling temperature and humidity. The specific temperature and humidity requirements vary depending on the type of extra-thick paper being processed; this implementation method is not limited to these. Temperature and humidity control is achieved through heating equipment and a humidifier. Similarly, temperature and humidity sensors are installed within the sealed space to work in conjunction with the heating equipment and humidifier, enabling precise control of temperature and humidity. After the sealed space is treated as described above, the extra-thick paper within it can be sufficiently moistened. This level of moisture causes the paper's capillaries to open up, but without filling the capillaries with water. Simultaneously, the continuous maintenance of humidity and temperature ensures that the internal capillaries of the extra-thick paper are also moistened.

[0048] For pretreated extra-thick paper, the method of this embodiment further includes:

[0049] S300: Performs a misting deacidification operation on pretreated extra-thick paper to bring the pH of the extra-thick paper to a preset value.

[0050] Fogging deacidification involves spraying a deacidifying agent onto the paper surface as an extremely fine and uniform atomized liquid using a specialized spraying device after the paper has been plasma-activated. Specifically:

[0051] S310: Spray deacidifying agent evenly onto pretreated extra-thick paper.

[0052] The misting deacidification operation can achieve uniform spraying of deacidifying agent on the paper surface, ensuring that all parts of the paper receive the same amount of deacidifying agent. Similarly, if the paper is composed of different paper materials, different amounts of deacidifying agent can be sprayed on different parts by changing the stroke of the spraying device.

[0053] S320: After the deacidifying agent has been applied, the pH value is tested at multiple test points on extra-thick paper.

[0054] The purpose of spraying deacidifying agent onto paper is to neutralize the acidity of the paper in order to extend its shelf life. However, both excessively high and low pH levels are detrimental to the preservation of paper. Therefore, it is necessary to test the pH at different locations on the paper after the deacidifying agent has fully impregnated it to ensure that the deacidifying agent has undergone a sufficient and effective neutralization reaction with the paper.

[0055] S330: If the pH meets the preset value, stop spraying the deacidifying agent; otherwise, continue to spray the deacidifying agent evenly until the pH meets the preset value.

[0056] S400: During the aforementioned mist-wetting deacidification operation, maintain the humidity and temperature around the extra-thick paper at the same level as during pretreatment. Specifically:

[0057] S410: During the aforementioned misting and deacidification operation, the humidity and temperature around the extra-thick paper are monitored in real time;

[0058] S420: When the humidity is higher than the humidity during pretreatment, the humidification effect is reduced; when the humidity is lower than the humidity during pretreatment, the humidification effect is increased to keep the humidity the same as the humidity during pretreatment.

[0059] S430: When the temperature is lower than the pretreatment temperature, heat the area around the paper; when the temperature is higher than the pretreatment temperature, stop heating the area around the paper to maintain the temperature at the same level as the pretreatment temperature.

[0060] S500: After the pH of the extra-thick paper reaches the preset value, the humidity and temperature around the extra-thick paper remain unchanged, ultimately achieving complete deacidification of the extra-thick paper.

[0061] S600: Stop humidity and temperature maintenance; allow extra-thick paper to dry naturally after deacidification.

[0062] By removing the sealed space or turning on the ventilation equipment to dry the deacidified extra-thick paper, the paper can be restored to its original dry state. At this time, the acidity and alkalinity of the paper meet the standard, and the deacidification of the extra-thick paper is complete.

[0063] refer to Figure 2 This embodiment further discloses a uniform deacidification device for extra-thick paper, which can realize the above-mentioned uniform deacidification method for extra-thick paper.

[0064] Specifically, the deacidification device includes a frame 1, which can switch between a sealed and an open state. In the open state, the interior of the frame 1 can exchange gases with the outside environment. The frame 1 includes a frame on which multiple plates 11 are mounted. At least one plate 11 is closably connected to the frame, allowing gas exchange between the interior of the frame 1 and the outside environment, as well as the entry and exit of paper items. In one or more embodiments, the plate 11 closably connected to the frame can also be a structure such as a curtain that isolates the frame 1 from the outside environment.

[0065] Furthermore, the frame 1 contains a deacidifying machine 2 for mist-wetting and deacidifying paper. The deacidifying machine 2 is connected to a container 21 containing a deacidifying agent for deacidifying extra-thick paper. In this embodiment, the deacidifying agent is an alkaline deacidifying agent. The deacidifying machine 2 is equipped with an open, extra-thick paper adsorption and fixing device. Multiple humidity sensors 3 and temperature sensors 4 are installed around the deacidifying machine 2 inside the frame 1 for real-time monitoring of the temperature and humidity around the extra-thick paper. The frame 1 also contains a humidifier 5 and a heating device 6, which are communicatively connected to the multiple humidity sensors 3 and temperature sensors 4. The humidity sensors 3 and temperature sensors 4 are connected to the humidifier 5 and heating device 6 via wired or wireless connections. The humidity sensors 3 control the operation or shutdown of the humidifier 5, and the temperature sensors 4 control the operation or shutdown of the heating device 6, together regulating the humidity and temperature around the extra-thick paper. A controller 7 is also installed on the frame 1. The controller 7 is electrically connected to the humidity sensor 3 and the temperature sensor 4, and is used to supply power to the humidity sensor 3 and the temperature sensor 4 and to collect and display real-time temperature and humidity. The controller 7 is also electrically connected to the humidifier 5 and the heating device 6 to provide power.

[0066] The specific embodiments described above do not constitute a limitation on the scope of protection of this invention. Those skilled in the art should understand that various modifications, combinations, sub-combinations, and substitutions can occur depending on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

Claims

1. A method for uniformly deacidifying extra-thick paper, characterized in that, The extra-thick paper is defined as having a thickness greater than 0.15 mm or a basis weight greater than 120 g / m³. 2 The paper, the method being performed continuously within a confined space, includes: The extra-thick paper to be deacidified is pretreated to achieve pre-humidification and heat preservation, and the humidity and temperature are kept constant until the mist deacidification operation is carried out; The pretreated extra-thick paper is subjected to a mist wetting and deacidification process to bring the pH of the extra-thick paper to the preset value. During the aforementioned mist deacidification operation, the humidity and temperature around the extra-thick paper should be kept the same as during the pretreatment. After the pH of the extra-thick paper reaches the preset value, the humidity and temperature around the extra-thick paper are kept constant, effectively forming a deacidifying agent transport channel in the paper cross-section direction, ultimately achieving complete neutralization reaction and thorough deacidification of the extra-thick paper.

2. The method for uniform deacidification of extra-thick paper according to claim 1, characterized in that, The method for pre-treating the extra-thick paper to be deacidified, achieving pre-humidification and heat preservation, includes: Place the extra-thick paper to be deacidified in a sealed space; Humidification and heat preservation are carried out in enclosed spaces, and the temperature and humidity are kept constant to achieve pre-humidification and heat preservation of extra-thick paper.

3. The method for uniform deacidification of extra-thick paper according to claim 1, characterized in that, The method for ensuring that the humidity and temperature of the extra-thick paper are the same as those during pretreatment during the mist deacidification operation includes: During the aforementioned mist-wetting deacidification operation, the humidity and temperature around the extra-thick paper are monitored in real time. When the humidity is higher than the humidity during pretreatment, the humidification effect is reduced; when the humidity is lower than the humidity during pretreatment, the humidification effect is increased to keep the humidity the same as the humidity during pretreatment. When the temperature is lower than the pretreatment temperature, heat the area around the paper. When the temperature is higher than the pretreatment temperature, stop heating the area around the paper to maintain the temperature at the same level as the pretreatment temperature.

4. The method for uniform deacidification of extra-thick paper according to claim 1, characterized in that, Before pre-treating the extra-thick paper to be deacidified, including pre-humidification and heat preservation, the method further includes: Plasma scanning is performed on the surface of extra-thick paper to activate the surface of the extra-thick paper.

5. The method for uniform deacidification of extra-thick paper according to claim 1, characterized in that, After the pH of the extra-thick paper reaches a preset value, the humidity and temperature around the extra-thick paper are kept constant to effectively form a deacidifying agent transport channel in the paper cross-section direction, ultimately achieving complete neutralization of the extra-thick paper. After thorough deacidification, the method further includes: Stop maintaining humidity and temperature; The extra-thick paper after deacidification is ventilated and dried.

6. A uniform deacidification device for extra-thick paper, used to implement the deacidification method as described in any one of claims 1-5, characterized in that, include: A sealable or openable frame (1), wherein a deacidification machine (2) for deacidifying the extra-thick paper is provided inside the frame (1); Multiple sets of humidity sensors (3) and temperature sensors (4) are installed around the deacidifier (2) to monitor the humidity and temperature around the extra-thick paper in real time. The humidifier (5) and heating device (6) are installed in the frame (1). The humidifier (5) and heating device (6) are communicatively connected to multiple sets of humidity sensors (3) and temperature sensors (4) to regulate the humidity and temperature around the extra-thick paper.

7. The uniform deacidification device for extra-thick paper according to claim 6, characterized in that, The frame (1) includes a frame and a plurality of plates (11), the plurality of plates (11) are mounted on the frame, and at least one plate (11) is closably connected to the frame.

8. The uniform deacidification device for extra-thick paper according to claim 7, characterized in that, The deacidifier (2) is connected to a container (21) containing a deacidifying agent for deacidifying extra-thick paper.

9. The uniform deacidification device for extra-thick paper according to claim 8, characterized in that, The deacidifying agent is an alkaline aqueous deacidifying agent.

10. The uniform deacidification device for extra-thick paper according to claim 9, characterized in that, The alkaline substances contained in the alkaline aqueous deacidifying agent are one or more of calcium hydroxide, calcium bicarbonate, magnesium bicarbonate, calcium carbonate, magnesium carbonate, and tetraborate.

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