Method for recycling and manufacturing antibacterial food-grade paperboard from waste paper pulp using food additives

Abstract

To provide a method for producing safe and secure antibacterial paperboard from waste paper. [Solution] A disinfectant made from a food additive is added multiple times to a pulp slurry prepared from recycled paper. Furthermore, an antibacterial agent made from a food additive is added to the pulp slurry immediately before papermaking. The disinfectant added to the pulp slurry can be, for example, a peracetic acid preparation, and the antibacterial agent can be, for example, a grapefruit seed extract preparation.

Description

[Technical Field]

[0001] The present invention relates to a method and system for producing antibacterial paperboard made from recycled paper pulp for food packaging applications. [Background technology]

[0002] A method for producing antibacterial paperboard that can be used for food packaging using recycled pulp has been investigated. The inventors of the present application have investigated a method for coating the surface of paperboard with an antibacterial agent, which does not require major changes to the conventional production line. However, the antibacterial effect of the prepared paperboard was not long-lasting, and the antibacterial effect was not consistent from one production run to the next.

[0003] Paperboard manufacturing using recycled paper pulp is well known, but recycled paper pulp can contain a wide variety of bacteria depending on the disposal location, recovery method, and storage environment. Therefore, even in recycled paperboard that has undergone heating and drying processes, a large number of bacteria remain viable or able to grow. Bacterial spores, which have particularly strong shell structures, are heat-resistant and chemical-resistant, and are therefore expected to be present in large quantities in the final paperboard.

[0004] In fact, the method of applying an antibacterial agent to recycled paperboard investigated by the present inventors was unable to sufficiently eliminate bacteria living in the paperboard, and did not result in the production of paperboard suitable for food packaging applications.

[0005] This bacterial contamination has made it virtually impossible to actively apply recycled paperboard to food contact applications where hygiene is important, such as paper containers and packaging for food. In other words, although the use of recycled paper pulp has environmental and cost advantages due to the effective use of recycled resources, the problem of microbial contamination from recycled paper pulp has been a major barrier to expanding its use.

[0006] The problem of bacteria in recycled pulp not only affects the pulp itself, but also the production line. The water system in the papermaking process contains a high concentration of organic matter and is an ideal temperature environment for bacterial growth. As bacteria grow, a sticky substance (slime) is produced, which can cause clogging of the paper machine and paper breaks, reducing productivity. It can also cause problems such as reduced quality, such as spots and defects in the paper. [Prior art documents] [Patent documents]

[0007] [Patent Document 1] Patent No. 5724071 (Method for preventing slime generation in papermaking processes) [Patent Document 2] JP 2002-336867 A (Sterilization method in paper pulp manufacturing process) [Patent Document 3] JP 2011-226044 A (Method for suppressing slime) [Patent Document 4] JP 10-273408 A (Microbicidal composition and method for controlling microorganisms) [Patent Document 5] JP 11-071208 A (Composition having microbicidal activity and method for controlling microorganisms) [Patent Document 6] JP 2012-072071 A (industrial antibacterial composition) [Patent Document 7] Patent No. 5339921 (Inhibition of microbial growth in pulp and paper processing) [Patent Document 8] JP 07-265866 A (Use of glutaraldehyde and 2-(thiocyanomethylthio)benzothiazole as disinfectants for industrial water used in pulp and papermaking) [Patent Document 9] JP 61-083105 A (Antibacterial agent for paper pulp manufacturing systems) [Patent Document 10] JP 51-125732 A (Slime control agent in the paper and pulp industry) [Patent Document 11] Patent No. 6361766 (Method for sterilizing bacterial spores in the paper pulp manufacturing process) [Patent Document 12] Patent No. 6552709 (Method for processing and sterilizing used sanitary products) [Patent Document 13] JP 2024-137210 A (Method for killing spore-forming bacteria)

[0008] Patent documents 1 to 10 describe methods for sterilizing and slime suppressing recycled paper pulp, but all of them use chlorine-based disinfectants, such as hypochlorous acid, or a combination of organic disinfectants and chlorine-based disinfectants, the safety of which is unknown, and are therefore not suitable for preparing paperboard intended for packaging that will come into contact with food. Furthermore, none of these methods impart antibacterial properties to paperboard.

[0009] Methods for decomposing bacterial spores in pulp are disclosed in Patent Documents 11 to 13. However, all of these methods use oxidizing chlorine compounds such as hypochlorous acid and chloramine, and chloramine in particular is highly persistent and toxic, making it unsuitable for recycling waste paper into paperboard that can be used for food packaging. Summary of the Invention [Problem to be solved by the invention]

[0010] In view of the problems of the prior art described above, the object of the present invention is to provide a method and system for manufacturing recycled paperboard that suppresses slime formation on the papermaking line, sterilizes waste paper pulp in a manner that ensures safety suitable for food packaging, and has a sustained antibacterial effect. [Means for solving the problem]

[0011] The above object is achieved by a system that includes a process of preparing raw pulp into pulp slurry, and a system that adds a disinfectant and an antibacterial agent consisting of food additives multiple times at different times to a papermaking machine that makes paper using the pulp slurry on its way to a chest, the pulp slurry stored in the chest, the pulp slurry on its way from the chest to a seed box, the pulp slurry stored in the seed box, and the pulp slurry of a predetermined concentration sent from the seed box.

[0012] The present invention is characterized in that the combination of two or more germicides and / or antibacterial agents produces a synergistic action, enhancing the germicidal effect.

[0013] In the paperboard manufacturing method, a formulation containing peracetic acid, a food additive, and grapefruit seed extract, an existing additive, is used as the bactericide and / or antibacterial agent.

[0014] In the present invention, recycled paper pulp can be used as the raw material pulp. This allows for the effective reuse of waste paper resources, contributing to the reduction of environmental impact from the perspectives of protecting forest resources and reducing waste. Furthermore, this can meet modern social demands (SDGs) that call for sustainable resource use, thereby increasing the market value of environmentally friendly products. [Effects of the Invention]

[0015] In this invention, a fungicide, a food additive, is added to the pulp slurry in the chest before it reaches the seed box, and the fungicide is allowed to remain there. This allows the fungicide to spread throughout the pulp fibers, ensuring sufficient time for sterilization. As a result, the number of live bacteria in the pulp slurry sent to the downstream process can be effectively reduced in the chest.

[0016] In this invention, an antibacterial agent composed of a food additive is added to the seed box where the pulp slurry prepared to a predetermined concentration is stored and / or during the process of transporting the pulp slurry to the seed box. This allows the antibacterial agent to be uniformly dispersed throughout the pulp slurry and spread between the pulp fibers. As a result, any live bacteria that escaped the sterilization treatment in the chest are completely killed and the antibacterial agent is dispersed throughout the finished paperboard. Adding the antibacterial agent at the pulp slurry stage, which has a stable concentration just before papermaking, allows for appropriate control of the amount of antibacterial agent added without being affected by fluctuations in the pulp slurry concentration. This prevents cost increases due to excessive addition of antibacterial agent and prevents a decrease in antibacterial activity due to insufficient antibacterial agent. This maintains antibacterial effectiveness and improves economic efficiency, establishing an efficient paperboard manufacturing process.

[0017] In the present invention, by mixing an antibacterial agent made from a food additive with the pulp slurry in the seed box, the antibacterial agent is uniformly dispersed inside the finished paperboard as well as on the surface, and antibacterial properties can be imparted to the cut surfaces of the paperboard, which cannot be achieved by surface coating with an antibacterial agent.

[0018] In the present invention, the antibacterial agent can be uniformly dispersed inside the paperboard, and even when the surface is peeled off due to friction or the inside of the paperboard is exposed due to cutting, the paperboard can be prepared to maintain its antibacterial effect for a long period of time.

[0019] In the present invention, the fungicide is added multiple times with time lags, allowing the fungicide to act gradually and sustainably, effectively reducing the number of bacteria in the pulp slurry and significantly improving the sanitation of the pulp slurry. As a result, the number of live bacteria in the pulp slurry immediately before papermaking is significantly reduced or completely eliminated, making it possible to produce safer and more hygienic paperboard.

[0020] In this invention, peracetic acid, a food additive, is used as a disinfectant and grapefruit seed extract, a conventional additive, is used as an antibacterial agent. This eliminates safety concerns due to components derived from the disinfectant, even when the finished paperboard comes into direct contact with food, such as paper containers and packaging for food, and allows for the production of antibacterial paperboard that can be used safely in fields where hygiene is important.

[0021] Due to its strong oxidizing properties, peracetic acid decomposes even bacterial spores, which are highly resistant to chemicals. Peracetic acid instantly decomposes into acetic acid and volatilizes when heated during the papermaking process (drying part, etc.), leaving almost no residue in the final paperboard product. The small amount of acetic acid that remains forms a salt with the cationic compound, the antibacterial component of grapefruit seed extract, which not only eliminates the pungent odor characteristic of acetic acid but also enhances the antibacterial effect. The antibacterial component and acetate salt of grapefruit seed extract are virtually undecomposed and do not volatilize during the heating process. As a result, paperboard containing highly safe bactericidal and antibacterial components with long-lasting antibacterial activity is completed.

[0022] Peracetic acid is a powerful oxidizing agent and has a bleaching effect on pulp. Hydrogen peroxide, a decomposition product of peracetic acid, also has a bleaching effect. The present invention uses the decomposition product of peracetic acid to sterilize pulp and bleach it at the same time. Additionally, by using grapefruit seed extract, an existing additive, in combination, it is possible to prepare paperboard with long-lasting antibacterial effects.

[0023] The problem of microbial proliferation in the papermaking process is not limited to the pulp product, but also affects the production line. The generation of slime due to microbial proliferation on the production line not only reduces paper quality but also causes clogging of the papermaking machine. Microbial proliferation can be suppressed by physical removal of microorganisms through filtration, chemical treatments such as the addition of antibacterial agents or surfactants, and pH adjustment. Another method utilizes antagonistic microorganisms to combat slime-producing bacteria. Physical suppression methods, such as filtration, are unsuitable for treating the large amounts of water required in the papermaking process due to limitations such as filtration speed and filter replacement frequency. Chemical treatment methods also cannot completely eliminate resistant bacteria, environmental impacts, or spores that are highly resistant to antibacterial agents. It is easy to imagine that identifying slime-producing bacteria and discovering antagonistic microorganisms would require a significant amount of time, and there is a very high possibility that antagonistic organisms will never be found. In this regard, the present invention utilizes the strong oxidizing power of peracetic acid to not only sterilize pulp but also suppress microbial proliferation in the production line itself, thereby resolving slime-related problems. [Brief explanation of the drawings]

[0024] [Figure 1] 1 is a diagram showing the paperboard manufacturing process. [Figure 2] FIG. 1 is a graph showing the concentration dependence of the bactericidal activity when a peracetic acid preparation is added all at once or in divided portions. [Figure 3] FIG. 1 shows the bactericidal activity of a grapefruit seed extract preparation in combination with a peracetic acid preparation. DETAILED DESCRIPTION OF THE INVENTION

[0025] (Paperboard manufacturing method) FIG. 1 shows a paperboard manufacturing system used to implement the paperboard manufacturing method of the present invention, and the paperboard manufacturing process in this system. A method for manufacturing paperboard will be described below with reference to Fig. 1. In the following description of the embodiment, paperboard is used as an example, but the present invention is applicable to recycled paper in general and is not limited to paperboard.

[0026] The paperboard manufacturing process mainly consists of the following two steps: (1) A "pulp slurry preparation process" in which a pulp slurry containing raw pulp is prepared. (2) A "papermaking process" in which the pulp slurry is adjusted to a predetermined consistency and paper is made.

[0027] In this embodiment, recycled paper pulp is used as an example of raw material pulp, but virgin pulp can also be used as raw material pulp.

[0028] First, the "pulp slurry preparation process" will be explained in order based on FIG.

[0029] 1. Waste paper raw materials (magazines, cardboard, newspapers, etc.) Recycled paper is a collection of recyclable paper materials such as magazines, cardboard, and newspapers. These materials are roughly sorted before entering the plant to prevent the possible inclusion of foreign matter. In particular, foreign matter such as staples and plastic fragments are removed early in the process. The sorted recycled paper is then used to prepare pulp slurry.

[0030] 2. Pulper: A machine that defibrates raw materials A pulper is a large tank-like machine that mixes waste paper with water to loosen the fibers and produce pulp slurry. This process removes any foreign matter attached to the paper by either floating or sinking it. The pulp slurry is then prepared for efficient processing in subsequent processes.

[0031] 3. Cyclone: ​​A machine that removes heavy foreign objects such as sand and metal objects. A cyclone is a device that uses centrifugal force to separate heavy foreign matter, such as sand and metal chips, contained in pulp slurry. The high-speed rotation inside the device pushes the heavy foreign matter outward, where it settles and is removed. This process protects downstream machinery and improves the purity of the pulp slurry.

[0032] 4. Screen: A machine that removes light foreign objects such as styrofoam. A screen is a device that removes light foreign matter such as polystyrene foam and plastic fragments. It uses a mesh filter with round holes or slits or a vibrating plate to effectively remove foreign matter while allowing the pulp slurry to pass through. This process removes impurities that can affect the paperboard manufacturing process.

[0033] 5. Thickener: Machine that cleans and thickens In the thickener, the pulp slurry is washed with water to remove dirt and fine foreign matter, ensuring the fluidity of the pulp slurry and adjusting the consistency, improving the processing efficiency in subsequent processes.

[0034] 6. First Chest (First Tank): Place to put raw materials The pulp slurry sent from the thickener is stored in the first chest. This chest, also known as the thickener chest, is a device that temporarily stores the pulp slurry and ensures a stable supply to the refiner, the next process. The first chest is equipped with an agitator that keeps the pulp slurry in a uniform state. Furthermore, by suppressing fluctuations in concentration and flow rate, it improves the processing efficiency of the refiner.

[0035] 7. Refiner: A machine that refines raw materials The refiner is a device that further breaks down and shreds the fibers in the pulp slurry. This beating process improves the strength and smoothness of the paperboard. The degree of fiber processing is adjusted according to the product characteristics, ensuring quality for each application.

[0036] 8. Second Chest (Second Tank): Place to put raw materials The pulp slurry processed in the refiner is sent to the second chest. This chest, also known as the refiner chest, temporarily stores the pulp slurry and ensures a stable supply to the next process (machine chest). The second chest is equipped with a stirring device that prevents the pulp slurry from separating and maintains its uniformity.

[0037] 9. 3rd Chest (3rd Tank): Place to put raw materials The pulp slurry placed in the second chest is mixed with chemicals and adjusted to maintain the quality of the paperboard according to the product's characteristics, before being sent to the third chest. This chest, also known as the machine chest, temporarily stores the pulp slurry and ensures a stable supply to the next process (seed box). The third chest is equipped with a stirring device that prevents the pulp slurry from separating and maintains its uniformity.

[0038] Next, the "papermaking process" will be explained in order based on FIG.

[0039] 10. Seed box: A device for adjusting the amount of raw materials used. The seed box is a device that prepares pulp slurry to the optimum consistency and state for paper layer formation. The relatively high-concentration pulp slurry sent from the third chest is diluted with water in the seed box to a predetermined consistency. This concentration adjustment ensures that the fibers are uniformly dispersed, allowing for efficient and stable paper layer formation in the wet part.

[0040] 11. Wet part: where the paper layers are made In the wet section, pulp slurry prepared to a specified consistency is poured onto a fabric (wire), and a paper layer is formed while removing excess water. The paper layer formed here is still soft and has a high moisture content. This process is important in determining the basic shape of the paper.

[0041] 12. Baby Press: A device that removes water from wet paper The baby press is where the initial process of removing water from the wet paper layer takes place. This process gradually hardens the paper layer. This dewatering process acts as a preparatory step to improve the processing efficiency in the subsequent press and dry sections.

[0042] 13. Press part: Equipment for removing water from wet paper In the press section, the paper layers processed in the baby press are subjected to even higher pressure to squeeze out the moisture. This process brings the paper layers to a nearly dry state, increasing their strength as paperboard.

[0043] 14. Drying part: Drying equipment In the dry section, heat is used to completely dry the paper layers, which ensures the dimensional stability and shelf life of the board and improves the quality of the finished product.

[0044] 15. Calender: A device for adding gloss. Calendering involves compressing the dried paper with rolls to smooth and polish the surface, an important final processing step that improves the appearance of the finished paperboard.

[0045] 16. Defect detector: A device that inspects paper for defects. A defect detector is a device that uses cameras and sensors to automatically detect defects such as stains and unevenness on the surface of paperboard. Based on this inspection data, the quality of the product is evaluated and defective products are removed.

[0046] 17. Pope reel: a device for rewinding paper The Pope reel is a winding device for winding up base paper into a huge roll. A steel pipe winding frame is tightly attached to a rotating drum, and the base paper is wound up evenly by applying a constant pressure in accordance with the surface speed of the drum.

[0047] 18. Winder: A device that divides rolled paper wound on a pole reel into smaller pieces. A winder is a device that splits large rolls wound on Pope reels into smaller rolls by switching reels according to the width and size of the product.

[0048] 19. Slitter: A device for cutting to width dimensions In the slitter, the paperboard that has passed through the defect detector is cut to the width appropriate for the intended use without passing through the Pope reel. This process ensures that the paperboard width is appropriate for the intended use of the product.

[0049] 20. Cutter: A device for cutting to length. The paperboard cut widthwise by the slitter is then cut to a predetermined length by a cutter, making it easier to store and transport.

[0050] 21. Layboy: A device that counts and stacks sheets In the layboy, the paperboard is cut with a cutter and stacked into sheets, which makes it easy to store and transport.

[0051] The papermaking process described above is made up of a papermaking machine that uses a baby press, press part, dry part (including a Yankee dryer), calendar, and defect detector, followed by equipment such as a slitter, cutter, and layboy to produce flat-sheet products, and equipment such as a Pope reel and winder to produce wound products.

[0052] In addition, the paperboard manufacturing system shown in Figure 1 is equipped with power equipment and wastewater treatment equipment.

[0053] Power equipment plays a role in supplying steam and thermal energy to the dry part of the papermaking process. Power equipment consists of superheaters, steam drums, fluidized bed boilers, steam turbine generators, etc., and provides the energy required for the papermaking process equipment and related facilities with steam supplied through the combustion of fuel.

[0054] Wastewater treatment facilities are responsible for purifying wastewater discharged from the papermaking process and pulp slurry preparation process. The wastewater treatment department consists of a settling tank, a biological treatment tank, a sludge dewatering facility, etc., and efficiently removes fine fibers and impurities. In addition, the sludge is dewatered and treated as solids, improving the water quality to a state that meets wastewater discharge standards.

[0055] (Addition of fungicide to pulp slurry in the pulp slurry preparation process) In this embodiment, a bactericide made of a food additive is added to the pulp slurry in the pulp slurry preparation step.

[0056] The timing of adding the fungicide in the pulp slurry preparation step is not particularly limited. For example, a predetermined amount of fungicide may be added to the pulp slurry stored in the second chest or the third chest, or the fungicide may be continuously added to the second chest or the third chest while the pulp slurry is being transported therethrough.

[0057] Furthermore, in the pulp slurry preparation step, the number of times the fungicide is added is not necessarily limited to one time, that is, the fungicide may be added to the pulp slurry multiple times at different times.

[0058] The disinfectant used in this embodiment is a disinfectant that can be used as a food additive, and examples of such disinfectants include peracetic acid preparations. Peracetic acid preparations are highly effective in decomposing not only common bacteria but also bacterial spores. A specific example of a usable peracetic acid preparation is Persan MP2-J (sold by Envirotech Japan Co., Ltd.).

[0059] (Addition of antibacterial agents to pulp slurry during papermaking process) In addition, in this embodiment, during the process of preparing the pulp slurry, a bactericide is added to significantly reduce the number of live bacteria in the pulp slurry, and then an antibacterial agent made from a food additive is added to the pulp slurry just before papermaking.

[0060] The timing of adding the antibacterial agent to the pulp slurry immediately before papermaking is not particularly limited. For example, a predetermined amount of the antibacterial agent may be added to a pulp slurry of a predetermined concentration stored in a seed box, or the antibacterial agent may be continuously added to the seed box while the slurry is being transferred from the third chest.

[0061] The antibacterial agent used in this embodiment is an antibacterial agent that can be used as a food additive, such as a grapefruit seed extract preparation, and specific examples include "Desfan-100" and "Desfan-10" (sold by Adept Co., Ltd.). "Desfan-100" and "Desfan-10" are natural disinfecting antibacterial agents and are recognized as existing food additives.

[0062] As described above, in this embodiment, a fungicide is added to the pulp slurry in the pulp slurry preparation process, and an antibacterial agent is further added to the pulp slurry prepared to a predetermined concentration in the papermaking process (i.e., the pulp slurry immediately before papermaking). The antibacterial agent is then mixed with the pulp fibers during paper layer formation and incorporated into the internal structure of the recycled paper, becoming dispersed on and within the paper. Therefore, the recycled paper already contains the antibacterial agent dispersed on and within the paper at the time of completion of its production.

[0063] Next, specific examples of the present invention will be described. [Example]

[0064] (Effect of combined use of peracetic acid preparation and grapefruit seed extract preparation) Pulp slurry was prepared from recycled paper in the same condition as stored in the first chest. The bactericidal activity of peracetic acid and grapefruit seed extract formulations was evaluated using a 3.5% slurry concentration and 300 mL volume (Table 1). The entire amount of each formulation was added in a short period of time while stirring the slurry. When adding the peracetic acid formulation in portions, the interval between the first and second additions was 15 minutes. When using both peracetic acid and grapefruit seed extract formulations, the interval between additions was also 15 minutes. After adding the formulations, the mixture was left to stand for 3 days, and the viable bacterial count was measured using a standard agar medium by the pour plate method.

[0065] [Table 1]

[0066] The results of the residual viable bacterial counts for the all-in-one and divided addition of peracetic acid formulations are shown in Table 1 and Figure 2. Under all addition conditions, a peracetic acid concentration-dependent decrease in viable bacterial count was observed, but the bactericidal efficiency was 12 to 50 times higher with two divided additions than with the all-in-one addition.

[0067] Table 1 and Figure 3 show the bactericidal activity of grapefruit seed extract formulations used alone and in combination with peracetic acid. Concentration-dependent bactericidal activity was observed when grapefruit seed extract formulations were used alone, but complete bactericidal activity was not achieved even when 0.50% peracetic acid was added. On the other hand, when grapefruit seed extract formulations were added to pulp slurry containing two separate doses of 0.025% peracetic acid, significant bactericidal activity was observed, even at concentrations where neither formulation was bactericidal. The bactericidal efficiency was approximately 20-fold and 5-fold when 0.025% peracetic acid was added twice (final peracetic acid concentration 0.050%) (B-1) and when 0.010% grapefruit seed extract formulation was added (C-1), respectively. However, the bactericidal efficiency was approximately 150,000-fold when the two formulations were used together at the same concentrations.

[0068] (Summary of experimental results) The above results indicate that the peracetic acid formulation and grapefruit seed extract formulation work in concert to decompose bacterial spores and sterilize waste paper pulp to a level suitable for use in food packaging, etc. [Example]

[0069] (Sustained antibacterial activity of recycled paperboard) Paperboard was manufactured using recycled pulp as a raw material according to the procedure shown in Figure 1. A 3.0% pulp slurry was pumped to the second chest at 2667 L / min, and a 15% peracetic acid formulation was pumped at 4.44 L / min. After a certain amount was pumped, the mixture was stirred for 30 minutes. Next, the pulp slurry and the same peracetic acid formulation were pumped to the third chest at 2667 L / min and 4.44 L / min, respectively. After the entire amount was pumped, the mixture was stirred for 30 minutes. The pulp slurry was then adjusted to a 2.2% concentration and pumped to the seed box at 3636 L / min. The grapefruit seed extract formulation was added to the seed box at 3.64 L / min. The peracetic acid concentration per pump was 0.025%, and the grapefruit seed extract formulation was 0.10%. The durability of the antibacterial effect of the paperboard manufactured using this process was verified. The prepared paperboard was stored at room temperature out of direct sunlight, with no humidity control in the storage environment.

[0070] Test method: JIS Z2801:2012

[0071] (Experimental results)

[0072] [Table 2]

[0073] As shown in Table 2, the antibacterial activity values ​​against Staphylococcus aureus and Escherichia coli were high both 6 and 13 months after the paperboard was manufactured. In particular, the antibacterial activity value at 13 months was unchanged from that at 6 months. This indicates that the recycled paperboard prepared according to the present invention maintains its antibacterial activity for a long period of time, more than one year.

Claims

1. A method for producing antibacterial recycled paper for food packaging made from waste paper, comprising: (a) adding a fungicide to the pulp slurry stored in the chest and / or during the transfer of the slurry to the chest at multiple time intervals; (b) adding an antibacterial agent to the seed box in which the pulp slurry is stored and / or during the transfer of the slurry to the seed box, once or multiple times, to impart antibacterial properties to the recycled paper to be produced; A method for producing antibacterial recycled paper for food packaging, comprising:

2. 2. The method for producing antibacterial recycled paper for food packaging according to claim 1, wherein the bactericide and the antibacterial agent are food additives.

3. 2. The method for producing antibacterial recycled paper for food packaging according to claim 1, wherein the disinfectant, which is a food additive, contains peracetic acid.

4. 2. The method for producing antibacterial recycled paper for food packaging according to claim 1, wherein the antibacterial agent, which is a food additive, contains grapefruit seed extract.

5. 10. Antibacterial recycled paper for food packaging, obtained by the method of claim 1, whose antibacterial activity lasts for at least one year.

6. Antibacterial recycled paper for food packaging, characterized in that it contains an antibacterial agent consisting of a food additive in a dispersed state inside and on the surface of the recycled paper, the antibacterial agent is incorporated into the internal structure of the recycled paper and mixed with pulp fibers, and the antibacterial agent is contained at the time the recycled paper is completed in production.

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