Manufacturing method of environment-friendly paper product

Abstract

The invention discloses a manufacturing method of an environment-friendly paper product. The environment-friendly paper product is prepared from the following raw materials in parts by mass: 60-70 parts of a main fiber raw material, 25-35 parts of an auxiliary fiber raw material, 3-8 parts of an environment-friendly additive and 1-2 parts of a pretreating agent. By means of the components, by adding the auxiliary fiber raw materials, the environmental protection property is remarkably improved, waste cotton and linen and agricultural waste are converted into papermaking raw materials, consumption of primary fibers is reduced, meanwhile, waste recycling is achieved, and pollution caused by incineration and landfill is reduced. The auxiliary fibers and the main fibers have a synergistic effect and are matched with the environment-friendly auxiliaries to reinforce the quality of the paper, the cotton and linen fibers improve the flexibility, the agricultural waste fibers enhance the stiffness, lignin and short fibers are separated through low-temperature pyrolysis, impurities are prevented from affecting the performance of the paper, and solid powder rich in the lignin and the short fibers is recycled and reused.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, and in particular to a method for manufacturing environmentally friendly paper products. Background Technology

[0002] With the increasing global awareness of environmental protection, the environmental friendliness and resource utilization of paper products, as important materials in daily life and industrial production, have become a focus of industry attention. Currently, the paper product manufacturing industry generally faces two core challenges: first, the dependence on raw materials and resource consumption; and second, the challenge of balancing the environmental burden of production processes with product quality.

[0003] In terms of raw materials, traditional papermaking processes mainly rely on native fibers such as wood and reeds as the main raw materials. Large-scale mining of native fibers not only exacerbates the consumption of forest resources and ecological damage, but also faces the problem of tight raw material supply.

[0004] In terms of production processes, existing technologies have significant shortcomings in fiber treatment and bleaching. On the one hand, lignin, as a major impurity in plant fibers, can severely affect paper's whiteness, strength, and other properties if not thoroughly removed; however, traditional high-temperature separation processes are not only energy-intensive but also prone to damaging the fiber structure, reducing the paper's mechanical properties. On the other hand, the bleaching process often uses a single chemical bleaching agent (such as chlorine or hypochlorite), which, while improving whiteness, can easily cause excessive fiber degradation, leading to a decrease in paper tear strength, burst strength, and other indicators. Furthermore, residual chemicals can produce an irritating odor, failing to meet the market demand for environmentally friendly paper products. Summary of the Invention

[0005] The purpose of this invention is to at least solve one of the technical problems existing in the prior art, and to provide a method for manufacturing environmentally friendly paper products. This method addresses the shortcomings in environmental friendliness, low waste utilization, difficulty in balancing paper quality and environmental performance, and fiber damage and pollution during the production process. Specifically, it solves the problems of high consumption of virgin fibers, pollution caused by the incineration and landfill of waste cotton, linen, and agricultural waste, and the lack of resource utilization; it also solves the problem that different fiber characteristics make it difficult to synergistically improve the overall quality of paper, such as flexibility, stiffness, tear strength, burst strength, and water resistance; and it improves resource utilization by achieving the main recycling of lignin through low-temperature pyrolysis, solving the problem of resource waste caused by the lack of lignin recycling in traditional processes, and the problem that the bleaching process easily damages fibers and may produce irritating odors, making it difficult to balance environmental protection and product quality.

[0006] The present invention also provides a method for manufacturing an environmentally friendly paper product as described above, comprising: the raw materials for preparation comprising, by weight, 60-70 parts of main fiber raw material, 25-35 parts of auxiliary fiber raw material, 3-8 parts of environmentally friendly additives, and 1-2 parts of pretreatment agent.

[0007] According to the present invention, the auxiliary fiber raw material comprises, by weight, 15-20 parts waste cotton and linen and 10-15 parts agricultural waste.

[0008] According to the present invention, an environmentally friendly paper product is provided, wherein the environmentally friendly additive is prepared by means of 10-15 parts by weight of sizing agent, 6-20 parts by weight of reinforcing agent, 15-30 parts by weight of bleaching agent, and 8-20 parts by weight of deinking agent.

[0009] According to the present invention, the sizing agent is prepared by means of 60-80 parts cationic starch, 6-10 parts oxidized starch, 5-15 parts carboxymethyl cellulose, 5-8 parts monoglyceride, and 3-5 parts citric acid by mass.

[0010] According to the present invention, the reinforcing agent is prepared by means of 50-70 parts cationic starch, 10-20 parts oxidized starch, 5-15 parts soybean fiber, 2-5 parts nanocellulose, and 2-5 parts citric acid by mass.

[0011] According to the present invention, the bleaching agent is prepared by comprising 20-60 parts hydrogen peroxide and 1-2 parts xylanase by mass.

[0012] According to the present invention, the pretreatment solution is prepared by means of 3-10 parts by weight of pectinase and 5-10 parts by weight of detergent.

[0013] A method for preparing an environmentally friendly paper product according to the present invention includes the following steps: S1. Main fiber raw material pulping treatment: Waste paper, which is the main fiber raw material, is put into a pulper, and an appropriate amount of water and deinking agent are added. The waste paper fibers are dispersed into pulp by mechanical stirring, and at the same time, fibers and non-fiber impurities are initially separated. S2. Pre-treatment of waste cotton and linen: Old clothes, textile scraps, waste yarn, etc., which are used as waste cotton and linen raw materials, are sorted by hand and screened by vibrating screen to separate non-cotton and linen materials, dust and fine impurities. The sorted cotton and linen fibers are then cut into 5-10cm fragments by a shearing machine. S3. Cleaning and degumming of cotton and linen fragments: Put the cotton and linen fragments from S2 into a drum washing machine, soak them in 50-60℃ hot water for 30-60 minutes, add environmentally friendly detergent for cleaning, then put them into a mixer and add pectinase, keep the temperature at 45-55℃, and stir for 60-120 minutes to obtain the treated cotton and linen fibers. S4. Pulping and screening of cotton and linen fibers: The cotton and linen fibers treated in S3 are sent to a disc mill for light pulping, and the resulting pulp is passed through a pressure screen with a sieve opening of 0.1-0.2 mm to remove unloosened fiber bundles and impurities. Then, it is concentrated by a screw press to a moisture content of 60%-70% to obtain cotton and linen fiber pulp. S5. Pre-treatment of agricultural waste: Agricultural waste, such as straw and rice husks, is sorted by hand and screened by vibrating screen to remove non-fibrous impurities, dust and fine impurities. The sorted raw materials are then crushed into small pieces of 2-5cm by hammer crusher. S6. Cleaning and deashing of agricultural waste: Put the crushed small pieces from S5 into a drum washing machine, soak them in hot water at 50-60℃ for 20-30 minutes and clean them. After cleaning, soak the cleaned raw materials in dilute hydrochloric acid at 1%-2% concentration at room temperature for 30-60 minutes to remove minerals such as silicon and calcium through acid hydrolysis reaction. Then rinse with clean water until neutral to obtain agricultural waste fiber. S7. Pulping of agricultural waste fibers: The agricultural waste fibers in S6 are pulped at low concentration in a conical pulping machine to obtain agricultural waste fiber pulp. S8. Mixed screening of pulp and agricultural waste fiber slurry: The pulp in S1 and the agricultural waste fiber slurry in S7 are added to a mixer for mixing. The resulting mixture is separated into long fiber mixed solution and short fiber and lignin mixed residue by a high-frequency vibrating screen. S9. Recycling of lignin and short fibers: The lignin mixed residue obtained in S8 is put into a screw press for dehydration treatment and the moisture content is reduced to 60%-70%. The residue is then put into a heating furnace and pyrolyzed at low temperature in an oxygen-free environment at 300-400℃ to remove some hemicellulose impurities, and a solid powder rich in lignin and short fibers is obtained. S10, Mixed bleaching of pulp original solution: The long fiber mixed solution in S8 and the cotton and linen fiber pulp in S4 are put into a mixer for mixing and stirring. During the stirring process, bleaching agent is added evenly to bleach and obtain the treated pulp. S11, Papermaking: The pulp treated in S10 is diluted to a low concentration, sizing agent, reinforcing agent and other additives are added, and after being stirred evenly, it is fed into the papermaking machine. The pulp is evenly distributed on the moving copper wire through the headbox. The water is initially filtered under the action of gravity and vacuum suction to form a wet sheet. After being compressed and dried in sequence, paper is obtained. S12. Processing of paper products: In S11, the paper is wound up by a winding machine to form a large paper roll. According to product requirements, it is cut into specified sizes by a cutting machine and processed into the required paper products.

[0014] Compared with existing technologies, the method for manufacturing environmentally friendly paper products provided by this invention has the following beneficial effects: I. By adding auxiliary fiber raw materials, the environmental friendliness is significantly improved. Waste cotton and linen, as well as agricultural waste, are transformed into papermaking raw materials, reducing the consumption of virgin fibers while realizing the resource utilization of waste and reducing pollution from incineration and landfill. The auxiliary fibers work synergistically with the main fibers, and together with environmentally friendly additives, enhance paper quality: cotton and linen fibers improve flexibility, agricultural waste fibers enhance stiffness, nanocellulose and soybean fibers in the reinforcing agent further improve tear strength and bursting strength, and sizing agents optimize water resistance.

[0015] Second, by separating lignin and short fibers through low-temperature pyrolysis, impurities are avoided from affecting paper performance, and the solid powder rich in lignin and short fibers is recovered for reuse. Adding a composite bleaching agent of hydrogen peroxide and xylanase after mixing the long fiber mixed solution with cotton and linen fiber pulp allows the bleaching agent to act more evenly in the mixed fiber system, reducing fiber damage while removing residual pigments. This results in paper with suitable whiteness and no irritating odor, balancing environmental protection and product quality. Attached Figure Description

[0016] The present invention will be further described below with reference to the accompanying drawings and embodiments; Figure 1 This is a flowchart of a method for preparing an environmentally friendly paper product according to the present invention. Detailed Implementation

[0017] This section will describe in detail specific embodiments of the present invention. Preferred embodiments of the present invention are shown in the accompanying drawings. The purpose of the drawings is to supplement the textual description with graphics, so that people can intuitively and vividly understand each technical feature and overall technical solution of the present invention, but they should not be construed as limiting the scope of protection of the present invention.

[0018] Example Reference Figure 1This invention discloses an environmentally friendly paper product comprising: 60-70 parts by weight of main fiber raw material, 25-35 parts by weight of auxiliary fiber raw material, 3-8 parts by weight of environmentally friendly additives, and 1-2 parts by weight of pretreatment agent. The auxiliary fiber raw material comprises 15-20 parts by weight of waste cotton and linen, and 10-15 parts by weight of agricultural waste. The environmentally friendly additives comprise 10-15 parts by weight of sizing agent, 6-20 parts by weight of reinforcing agent, 15-30 parts by weight of bleaching agent, and 8-20 parts by weight of deinking agent. The sizing agent comprises 60-80 parts by weight of cationic starch, 6-10 parts by weight of oxidized starch, 5-15 parts by weight of carboxymethyl cellulose, 5-8 parts by weight of monoglyceride, and 3-5 parts by weight of citric acid. The reinforcing agent, prepared by weight, comprises 50-70 parts cationic starch, 10-20 parts oxidized starch, 5-15 parts soybean fiber, 2-5 parts nanocellulose, and 2-5 parts citric acid. The bleaching agent, prepared by weight, comprises 20-60 parts hydrogen peroxide and 1-2 parts xylanase. The pretreatment solution, prepared by weight, comprises 3-10 parts pectinase and 5-10 parts detergent.

[0019] The method for preparing an environmentally friendly paper product according to this embodiment includes the following steps: S1. Main fiber raw material pulping treatment: Waste paper, which is the main fiber raw material, is put into a pulper, and an appropriate amount of water and deinking agent are added. The waste paper fibers are dispersed into pulp by mechanical stirring, and at the same time, fibers and non-fiber impurities are initially separated. S2. Pre-treatment of waste cotton and linen: Old clothes, textile scraps, waste yarn, etc., which are used as waste cotton and linen raw materials, are sorted by hand and screened by vibrating screen to separate non-cotton and linen materials, dust and fine impurities. The sorted cotton and linen fibers are then cut into 5-10cm fragments by a shearing machine. S3. Cleaning and degumming of cotton and linen fragments: Put the cotton and linen fragments from S2 into a drum washing machine, soak them in 50-60℃ hot water for 30-60 minutes, add environmentally friendly detergent for cleaning, then put them into a mixer and add pectinase, keep the temperature at 45-55℃, and stir for 60-120 minutes to obtain the treated cotton and linen fibers. S4. Pulping and screening of cotton and linen fibers: The cotton and linen fibers treated in S3 are sent to a disc mill for light pulping, and the resulting pulp is passed through a pressure screen with a sieve opening of 0.1-0.2 mm to remove unloosened fiber bundles and impurities. Then, it is concentrated by a screw press to a moisture content of 60%-70% to obtain cotton and linen fiber pulp. S5. Pre-treatment of agricultural waste: Agricultural waste, such as straw and rice husks, is sorted by hand and screened by vibrating screen to remove non-fibrous impurities, dust and fine impurities. The sorted raw materials are then crushed into small pieces of 2-5cm by hammer crusher. S6. Cleaning and deashing of agricultural waste: Put the crushed small pieces from S5 into a drum washing machine, soak them in hot water at 50-60℃ for 20-30 minutes and clean them. After cleaning, soak the cleaned raw materials in dilute hydrochloric acid at 1%-2% concentration at room temperature for 30-60 minutes to remove minerals such as silicon and calcium through acid hydrolysis reaction. Then rinse with clean water until neutral to obtain agricultural waste fiber. S7. Pulping of agricultural waste fibers: The agricultural waste fibers in S6 are pulped at low concentration in a conical pulping machine to obtain agricultural waste fiber pulp. S8. Mixed screening of pulp and agricultural waste fiber slurry: The pulp in S1 and the agricultural waste fiber slurry in S7 are added to a mixer for mixing. The resulting mixture is separated into long fiber mixed solution and short fiber and lignin mixed residue by a high-frequency vibrating screen. S9. Recycling of lignin and short fibers: The lignin mixed residue obtained in S8 is put into a screw press for dehydration treatment and the moisture content is reduced to 60%-70%. The residue is then put into a heating furnace and pyrolyzed at low temperature in an oxygen-free environment at 300-400℃ to remove some hemicellulose impurities, and a solid powder rich in lignin and short fibers is obtained. S10, Mixed bleaching of pulp original solution: The long fiber mixed solution in S8 and the cotton and linen fiber pulp in S4 are put into a mixer for mixing and stirring. During the stirring process, bleaching agent is added evenly to bleach and obtain the treated pulp. S11, Papermaking: The pulp treated in S10 is diluted to a low concentration, sizing agent, reinforcing agent and other additives are added, and after being stirred evenly, it is fed into the papermaking machine. The pulp is evenly distributed on the moving copper wire through the headbox. The water is initially filtered under the action of gravity and vacuum suction to form a wet sheet. After being compressed and dried in sequence, paper is obtained. S12. Processing of paper products: In S11, the paper is wound up by a winding machine to form a large paper roll. According to product requirements, it is cut into specified sizes by a cutting machine and processed into the required paper products.

[0020] Comparative example: Traditional paper products made solely from waste paper fibers.

[0021] Three identical papermaking experiments were conducted: a blank group, an experimental group, and a control group. Each group was given the same mass of the main fiber raw material. The experimental group received additional cotton and linen fibers and agricultural waste fibers, while the control group used only the main fiber. Paper of the same thickness was produced using the same process. The paper was placed in the same testing environment to test the number of folds (flexibility index): the number of folds before cracking was recorded under standard bending angles and forces. Bending strength (stiffness index) was tested: vertical pressure was applied using a folding tester, and the pressure value at which significant deformation occurred was recorded. Elongation at break was tested: the percentage of elongation at break was measured on a tensile testing machine.

[0022]

[0023] All the above data were obtained from more than ten experiments, and the average value was used. Comparative experiments show that adding cotton and linen fibers and agricultural waste fibers to the main fiber raw material significantly increases the number of folds the paper can withstand, demonstrating a substantial increase in flexibility; bending strength and elongation at break also significantly improve, indicating that stiffness is effectively strengthened. This solves the problem of traditional single-fiber paper's difficulty in achieving both flexibility and stiffness, and realizes the synergistic optimization of paper's mechanical properties.

[0024] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of the present invention.

Claims

1. An environmentally friendly paper product, characterized in that, include: The raw materials for its preparation include, by mass, 60-70 parts of main fiber raw material, 25-35 parts of auxiliary fiber raw material, 3-8 parts of environmentally friendly additives, and 1-2 parts of pretreatment agent.

2. The method for manufacturing an environmentally friendly paper product according to claim 1, characterized in that, The auxiliary fiber raw material comprises, by weight, 15-20 parts waste cotton and linen and 10-15 parts agricultural waste.

3. The method for manufacturing an environmentally friendly paper product according to claim 1, characterized in that, The environmentally friendly additive is prepared by means of 10-15 parts sizing agent, 6-20 parts reinforcing agent, 15-30 parts bleaching agent, and 8-20 parts deinking agent by weight.

4. The method for manufacturing an environmentally friendly paper product according to claim 3, characterized in that, The sizing agent is prepared by means of 60-80 parts cationic starch, 6-10 parts oxidized starch, 5-15 parts carboxymethyl cellulose, 5-8 parts monoglyceride, and 3-5 parts citric acid by mass.

5. The method for manufacturing an environmentally friendly paper product according to claim 3, characterized in that, The reinforcing agent is prepared by means of 50-70 parts cationic starch, 10-20 parts oxidized starch, 5-15 parts soybean fiber, 2-5 parts nanocellulose, and 2-5 parts citric acid by mass.

6. The method for manufacturing an environmentally friendly paper product according to claim 3, characterized in that, The bleaching agent is prepared by means of 20-60 parts hydrogen peroxide and 1-2 parts xylanase by mass.

7. The method for manufacturing an environmentally friendly paper product according to claim 1, wherein the pretreatment solution comprises, by weight, 3-10 parts pectinase and 5-10 parts detergent.

8. A method for manufacturing an environmentally friendly paper product, characterized in that, Includes the following steps: S1. Main fiber raw material pulping treatment: Waste paper, which is the main fiber raw material, is put into a pulper, and an appropriate amount of water and deinking agent are added. The waste paper fibers are dispersed into pulp by mechanical stirring, and at the same time, fibers and non-fiber impurities are initially separated. S2. Pre-treatment of waste cotton and linen: Old clothes, textile scraps, waste yarn, etc., which are used as waste cotton and linen raw materials, are sorted by hand and screened by vibrating screen to separate non-cotton and linen materials, dust and fine impurities. The sorted cotton and linen fibers are then cut into 5-10cm fragments by a shearing machine. S3. Cleaning and degumming of cotton and linen fragments: Put the cotton and linen fragments from S2 into a drum washing machine, soak them in 50-60℃ hot water for 30-60 minutes, add environmentally friendly detergent for cleaning, then put them into a mixer and add pectinase, keep the temperature at 45-55℃, and stir for 60-120 minutes to obtain the treated cotton and linen fibers. S4. Pulping and screening of cotton and linen fibers: The cotton and linen fibers treated in S3 are sent to a disc mill for light pulping, and the resulting pulp is passed through a pressure screen with a sieve opening of 0.1-0.2 mm to remove unloosened fiber bundles and impurities. Then, it is concentrated by a screw press to a moisture content of 60%-70% to obtain cotton and linen fiber pulp. S5. Pre-treatment of agricultural waste: Agricultural waste, such as straw and rice husks, is sorted by hand and screened by vibrating screen to remove non-fibrous impurities, dust and fine impurities. The sorted raw materials are then crushed into small pieces of 2-5cm by hammer crusher. S6. Cleaning and deashing of agricultural waste: Put the crushed small pieces from S5 into a drum washing machine, soak them in hot water at 50-60℃ for 20-30 minutes and clean them. After cleaning, soak the cleaned raw materials in dilute hydrochloric acid at 1%-2% concentration at room temperature for 30-60 minutes to remove minerals such as silicon and calcium through acid hydrolysis reaction. Then rinse with clean water until neutral to obtain agricultural waste fiber. S7. Pulping of agricultural waste fibers: The agricultural waste fibers in S6 are pulped at low concentration in a conical pulping machine to obtain agricultural waste fiber pulp. S8. Mixed screening of pulp and agricultural waste fiber slurry: The pulp in S1 and the agricultural waste fiber slurry in S7 are added to a mixer for mixing. The resulting mixture is separated into long fiber mixed solution and short fiber and lignin mixed residue by a high-frequency vibrating screen. S9. Recycling of lignin and short fibers: The lignin mixed residue obtained in S8 is put into a screw press for dehydration treatment and the moisture content is reduced to 60%-70%. The residue is then put into a heating furnace and pyrolyzed at low temperature in an oxygen-free environment at 300-400℃ to remove some hemicellulose impurities, and a solid powder rich in lignin and short fibers is obtained. S10, Mixed bleaching of pulp original solution: The long fiber mixed solution in S8 and the cotton and linen fiber pulp in S4 are put into a mixer for mixing and stirring. During the stirring process, bleaching agent is added evenly to bleach and obtain the treated pulp. S11, Papermaking: The pulp treated in S10 is diluted to a low concentration, sizing agent, reinforcing agent and other additives are added, and after being stirred evenly, it is fed into the papermaking machine. The pulp is evenly distributed on the moving copper wire through the headbox. The water is initially filtered under the action of gravity and vacuum suction to form a wet sheet. After being compressed and dried in sequence, paper is obtained. S12. Processing of paper products: In S11, the paper is wound up by a winding machine to form a large paper roll. According to product requirements, it is cut into specified sizes by a cutting machine and processed into the required paper products.

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