Preparation process and processing equipment of high-strength multi-layer composite thermal insulation packaging paper

Abstract

The invention relates to the field of packaging paper processing, and discloses a high-strength multi-layer composite heat preservation packaging paper preparation process and processing device.The high-strength multi-layer composite heat preservation packaging paper preparation process comprises the following steps that S1, metallurgical waste residue processing is conducted, specifically, metallurgical waste residues are cleaned, ground, filtered and then dried; s2, paper pulp processing; S3, packaging paper pulp preparation: uniformly mixing the processed metallurgical waste residues with the processed paper pulp; s4, finished paper preparation; s5, packaging paper processing, wherein after paper preparation is completed, paper is subjected to coating, compounding, drying and shaping, and packaging paper is obtained; and S6, subsequent detection. Metallurgical waste residues are cleaned, ground and filtered, so that the bonding degree of the metallurgical waste residues and paper pulp is enhanced, and the moisture content of the paper pulp is prevented from being influenced; the processed metallurgical waste residues and the processed paper pulp are uniformly mixed in proportion, so that the strength and durability of the paper are improved, and the use amount of raw wood pulp is reduced.

Description

Technical Field

[0001] The invention relates to the technical field of packaging paper processing, and in particular to a preparation process and processing equipment for high-strength multi-layer composite thermal insulation packaging paper. Background Art

[0002] Wrapping paper is a general term for a type of paper used for packaging purposes. It usually has high strength and toughness, and can withstand pressure and folding. Its quality requirements are simpler than those of cultural printing paper and other types of paper. There are many subdivided types of paper, each with different properties and uses. According to different uses and characteristics, wrapping paper can be divided into many types to meet the packaging needs of different commodities. It is widely used in all walks of life. In addition, with the improvement of environmental awareness, wrapping paper is playing an increasingly important role in sustainable development and green packaging.

[0003] The raw materials for preparing packaging paper are generally virgin wood pulp and waste paper pulp. Virgin wood pulp has better burst resistance and performance, but its cost is higher. Waste paper pulp has a lower cost, but its strength is worse than virgin wood pulp. In order to ensure that the strength of high-strength multi-layer composite thermal insulation packaging paper meets the standards, its raw materials are mostly virgin wood pulp, which leads to a relatively wasteful use of living resources during its manufacturing. Summary of the invention

[0004] In view of the shortcomings of the prior art, the present invention provides a high-strength multi-layer composite thermal insulation packaging paper preparation process and processing equipment to solve the problem of high-strength multi-layer composite thermal insulation packaging paper. In order to ensure that its strength meets the standards, its raw materials are mostly virgin wood pulp, resulting in a waste of living resources during its manufacturing.

[0005] To achieve the above objectives, the present invention is implemented through the following technical solutions: A process for preparing high-strength multi-layer composite thermal insulation packaging paper, comprising the following steps:

[0006] S1. Processing of metallurgical waste slag: cleaning the metallurgical waste slag, then grinding and filtering it to reduce its particle size to less than 100 microns, and then drying it to a dryness of more than 90%;

[0007] S2. Pulp processing: waste paper is shredded, de-inked, filtered and pulped to obtain waste paper pulp; natural wood is crushed, cut, chemically pulped, dehydrated and filtered to obtain virgin wood pulp; then the waste paper pulp and virgin wood pulp are evenly mixed in a ratio of 80%-60%:20%-40%;

[0008] S3. Preparation of packaging paper pulp: uniformly mix the processed metallurgical waste slag and the processed pulp in a ratio of 10%-30%:90%-70%. After the uniform mixing, add the corresponding auxiliary materials and then uniformly mix them;

[0009] S4, paper preparation: after the packaging paper pulp is prepared, the packaging paper pulp is formed, pressed and dried to form preliminary paper;

[0010] S5. Wrapping paper processing: After the paper is prepared, the paper is coated, compounded, dried and shaped to obtain the wrapping paper;

[0011] S6. Subsequent testing: The finished packaging paper is tested, and the test items include paper strength, moisture resistance, and thermal insulation.

[0012] Preferably, the amount of auxiliary materials added in step S3 is 5%-15% of the total amount of packaging paper pulp, and the auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, and barium sulfate, and their proportions by weight are 1-5:2-10:1-5:0.5-2:1-5:5-15:1-3.

[0013] Preferably, the forming in step S4 is to form the mixed packaging paper pulp into wet paper sheets by a vacuum forming machine, the pressing is to squeeze the wet paper sheets by a multi-roll press to remove excess water, and the moisture content of the wet paper sheets after pressing is 35%-60%, and the drying is to dry the squeezed paper sheets by a hot air dryer, and the dryness of the initially shaped paper is 85%-95%.

[0014] Preferably, the packaging paper in step S5 includes lining paper, core paper and surface paper, and the coating is to uniformly coat the lining paper, core paper and surface paper with one or more of thermal insulation material, foaming material, membrane material and adhesive, and the foaming material includes blast furnace slag extracted from metallurgical waste slag.

[0015] Preferably, the compounding in step S5 is to combine the lining paper, the core paper and the surface paper together by a compounding machine to obtain packaging paper, the drying is to dry the moisture in the packaging paper by a hot air dryer to make its moisture content 5%-10%, and the shaping is to calender the packaging paper and cut it into a required size.

[0016] Preferably, a high-strength multi-layer composite thermal insulation packaging paper processing equipment includes the following equipment: metallurgical waste slag processing equipment, which is used to clean, grind, filter and dry metallurgical waste slag; waste paper pulp preparation equipment, which is used to shred, deink, filter and pulp the waste slag; native wood pulp preparation equipment, which is used to crush, cut, chemically pulp, dehydrate and filter natural wood; high shear mixer, which is used to evenly mix the pulp; paper preparation equipment, which is used to shape, press and dry packaging paper pulp; packaging paper processing equipment; used for coating, compounding, drying and shaping paper; testing equipment, which is used to test the strength, moisture resistance and thermal insulation of paper.

[0017] Preferably, the metallurgical waste slag processing equipment includes an ultrasonic cleaner for cleaning metallurgical waste slag; a high-energy ball mill for grinding metallurgical waste slag; a multi-stage filter for filtering the ground metallurgical waste slag; a vacuum dryer for drying the metallurgical waste slag; the paper preparation equipment includes a vacuum forming machine for forming packaging paper pulp into paper; a multi-roll press for squeezing the formed paper to remove excess moisture; a hot air dryer for drying the extruded paper sheets, and the vacuum forming machine is provided with an ultraviolet sterilizer for sterilizing the packaging paper pulp.

[0018] Preferably, the waste paper pulp preparation equipment and the virgin wood pulp preparation equipment both include a crusher for crushing waste paper or wood; a pulping machine for pulping the crushed waste paper or wood pulp; a bleaching machine for bleaching the waste paper pulp or virgin wood pulp; a filter for filtering impurities in the waste paper pulp or impurities in the virgin wood pulp; the waste paper pulp preparation equipment also includes a deinking machine for deinking the waste paper pulp.

[0019] Preferably, the packaging paper processing equipment includes a coating machine for uniformly coating the lining paper, core paper and surface paper with one or more of thermal insulation materials, foaming materials, film materials and adhesives; a laminating machine for combining the lining paper, core paper and surface paper together; a hot air dryer for drying the laminated paper to obtain packaging paper; a calender for adjusting the flatness and glossiness of the packaging paper, and a cutting machine for dividing the calendered packaging paper accordingly; the testing equipment includes a tensile testing machine for testing the tensile strength of packaging paper; a moisture-proof tester for testing the moisture-proof performance of packaging paper; and a thermal insulation tester for testing the thermal insulation properties of packaging paper.

[0020] The present invention provides a preparation process and processing equipment for high-strength multi-layer composite thermal insulation packaging paper. It has the following beneficial effects:

[0021] 1. The present invention cleans, grinds and filters the metallurgical waste slag, thereby enhancing its bonding with the pulp and avoiding affecting the moisture content of the pulp; the processed metallurgical waste slag is evenly mixed with the processed pulp in proportion to improve the strength and durability of the paper, and reduce the amount of virgin wood pulp, thereby solving the problem of preparation of high-strength multi-layer composite thermal insulation packaging paper. In order to ensure that its strength meets the standard, its raw materials are mostly virgin wood pulp, resulting in a waste of living resources during its manufacturing.

[0022] 2. The present invention enhances the properties of pulp by adding processed metallurgical waste slag, improves the utilization rate of metallurgical waste slag, and reduces the waste of resources. The addition of metallurgical waste slag correspondingly improves the fire resistance and water resistance of paper, thereby enhancing the applicability of packaging paper; by mixing and adding auxiliary materials, the strength, heat resistance, smoothness and softness of the paper prepared in the subsequent steps are enhanced, thereby further enhancing the practicality of the packaging paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 The present invention is a schematic diagram of a process for preparing a high-strength multi-layer composite thermal insulation packaging paper. DETAILED DESCRIPTION

[0024] The technical solution of the present invention will be described clearly and completely below in conjunction with the accompanying drawings of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0025] Please refer to the attached Figure 1 The embodiment of the present invention provides a process for preparing a high-strength multi-layer composite thermal insulation packaging paper, comprising the following steps:

[0026] S1. Processing of metallurgical waste slag: cleaning the metallurgical waste slag, then grinding and filtering it to reduce its particle size to less than 100 microns, and then drying it to a dryness of more than 90%;

[0027] Specifically, the metallurgical waste slag is cleaned to remove impurities, grease and other pollutants in the waste slag to ensure the purity of subsequent processing; the metallurgical waste slag is ground to a particle size of less than 100 microns to improve the uniformity of mixing with pulp and the adaptability to subsequent processing; the ground metallurgical waste slag is dried to a dryness of more than 90% to facilitate storage and use, prevent mold or affect the moisture content of the pulp during mixing in subsequent steps, thereby enhancing its bonding with the pulp in subsequent steps.

[0028] S2. Pulp processing: waste paper is shredded, de-inked, filtered and pulped to obtain waste paper pulp; natural wood is crushed, cut, chemically pulped, dehydrated and filtered to obtain virgin wood pulp; then the waste paper pulp and virgin wood pulp are evenly mixed in a ratio of 80%-60%:20%-40%;

[0029] Specifically, by uniformly mixing waste paper pulp and virgin wood pulp in proportion, the performance of the pulp is optimized, thereby reducing the use of virgin wood pulp and reducing the waste of living resources.

[0030] S3. Preparation of packaging paper pulp: uniformly mix the processed metallurgical waste slag and the processed pulp in a ratio of 10%-30%:90%-70%. After the uniform mixing, add the corresponding auxiliary materials and then uniformly mix them;

[0031] Specifically, the processed metallurgical waste slag is uniformly mixed with the processed pulp to enhance the properties of the pulp, improve the strength and durability of the paper prepared in the subsequent steps, and at the same time improve its application value and environmental protection, reduce the waste of resources, and the addition of metallurgical waste slag correspondingly improves the fire resistance and water resistance of the paper, thereby enhancing the applicability of the packaging paper; by mixing and adding auxiliary materials, the strength, heat resistance, smoothness and softness of the paper prepared in the subsequent steps are enhanced, thereby enhancing the practicality of the packaging paper.

[0032] S4, paper preparation: after the packaging paper pulp is prepared, the packaging paper pulp is formed, pressed and dried to form preliminary paper;

[0033] Specifically, the packaging paper pulp is formed, pressed and dried to form a preliminary paper having a certain strength and dryness, which is convenient for subsequent processing steps.

[0034] S5. Wrapping paper processing: After the paper is prepared, the paper is coated, compounded, dried and shaped to obtain the wrapping paper;

[0035] Specifically, the packaging paper is obtained by coating, laminating, drying and shaping the paper.

[0036] S6. Subsequent testing: The finished packaging paper is tested, and the test items include paper strength, moisture resistance, and thermal insulation.

[0037] Specifically, by testing the finished packaging paper, the quality of the final product is ensured, the reliability and stability of the packaging paper during use are ensured, quality complaints due to material problems are avoided, and customer satisfaction is improved. Through the gradual implementation of the above steps, high-strength multi-layer composite thermal insulation packaging paper can be prepared, and the amount of virgin wood pulp is reduced, thereby solving the problem of preparation of high-strength multi-layer composite thermal insulation packaging paper. In order to ensure that its strength meets the standard, its raw materials are mostly virgin wood pulp, which leads to a waste of living resources during its manufacturing.

[0038] The amount of auxiliary materials added in step S3 is 5%-15% of the total amount of packaging paper pulp. The auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, and barium sulfate, and their proportions by weight are 1-5:2-10:1-5:0.5-2:1-5:5-15:1-3.

[0039] Specifically, the addition of cellulose nanocrystals can improve the tensile strength and tear strength of paper, the addition of starch and polyurethane can help improve the flexibility and water resistance of paper, the addition of talcum powder and calcium carbonate can increase the smoothness and whiteness of paper and improve printing performance, and the use of xanthan gum can improve the rheological properties of pulp and improve the uniformity and stability of molding.

[0040] In step S4, the forming step is to form the mixed packaging paper pulp into wet paper sheets through a vacuum forming machine, the pressing step is to squeeze the wet paper sheets through a multi-roll press to remove excess water, and the moisture content of the wet paper sheets after squeezing is 35%-60%, and the drying step is to dry the squeezed paper sheets through a hot air dryer. The dryness of the initially shaped paper sheets is 85%-95%.

[0041] Specifically, the mixed packaging paper pulp is formed into wet paper sheets through a vacuum forming machine, and the pulp initially forms the structure of paper, which is convenient for subsequent processing; the wet paper sheets are squeezed by a multi-roll press to remove excess water, increase the density of the paper, and enhance its strength and toughness; the squeezed paper sheets are dried by a hot air dryer to form a preliminary shaped paper, and the stability of the dried paper is enhanced, deformation and cracking caused by moisture changes are reduced, and subsequent steps are convenient.

[0042] In step S5, the wrapping paper includes lining paper, core paper, and face paper; coating is to uniformly coat the lining paper, core paper, and face paper with one or more of a heat-insulating material, a foaming material, a film material, and an adhesive, wherein the foaming material includes blast furnace slag extracted from metallurgical waste slag; compounding in S5 is to combine the lining paper, core paper, and face paper together through a compounding machine to obtain wrapping paper; drying is to dry the moisture in the wrapping paper through a hot air dryer to reduce its moisture content to 5%-10%; shaping is to calender the wrapping paper and cut it into a desired size.

[0043] Specifically, through coating, the paper can have functions such as heat preservation, barrier, and bonding, and enhance its performance in specific environments. Through compounding, the advantages of different layers of paper can be combined to form stronger and more resilient packaging paper. The moisture in the packaging paper is further dried by a hot air dryer to make its moisture content moderate, thereby avoiding the performance degradation of the paper due to moisture or overdrying. By calendering the packaging paper and cutting it into the required size, it is ensured that the packaging paper meets the packaging requirements of different products.

[0044] A high-strength multi-layer composite thermal insulation packaging paper processing equipment, including the following equipment: metallurgical waste slag processing equipment, used for cleaning, grinding, filtering and drying metallurgical waste slag; waste paper pulp preparation equipment, used for shredding, deinking, filtering and pulping waste slag; native wood pulp preparation equipment, used for crushing, cutting, chemical pulping, dehydration and filtering natural wood; high shear mixer, used for uniformly mixing pulp; paper preparation equipment, used for molding, pressing and drying packaging paper pulp; packaging paper processing equipment; used for coating, compounding, drying and shaping paper; testing equipment, used for testing paper strength, moisture resistance and thermal insulation.

[0045] Metallurgical waste slag processing equipment includes ultrasonic cleaners for cleaning metallurgical waste slag; high-energy ball mills for grinding metallurgical waste slag; multi-stage filters for filtering ground metallurgical waste slag; vacuum dryers for drying metallurgical waste slag; paper preparation equipment includes vacuum forming machines for forming packaging paper pulp into paper; multi-roll presses for squeezing formed paper to remove excess moisture; hot air dryers for drying extruded paper sheets, and the vacuum forming machine is equipped with an ultraviolet sterilizer for sterilizing packaging paper pulp.

[0046] Both the waste paper pulp preparation equipment and the virgin wood pulp preparation equipment include a crusher for crushing waste paper or wood; a pulping machine for pulping the crushed waste paper or wood pulp; a bleaching machine for bleaching the waste paper pulp or virgin wood pulp; a filter for filtering impurities in the waste paper pulp or impurities in the virgin wood pulp; the waste paper pulp preparation equipment also includes a deinking machine for deinking the waste paper pulp.

[0047] The packaging paper processing equipment includes a coating machine, which is used to uniformly coat the lining paper, core paper and surface paper with one or more of thermal insulation materials, foaming materials, film materials and adhesives; a laminating machine, which is used to combine the lining paper, core paper and surface paper together; a hot air dryer, which is used to dry the laminated paper to obtain packaging paper; a calender, which is used to adjust the flatness and glossiness of the packaging paper, and a cutting machine, which is used to divide the calendered packaging paper accordingly; the testing equipment includes a tensile testing machine, which is used to test the tensile strength of the packaging paper; a moisture-proof tester, which is used to test the moisture-proof performance of the packaging paper; and a thermal insulation tester, which is used to test the thermal insulation of the packaging paper.

[0048] The following is further introduced in conjunction with specific embodiments:

[0049] Embodiment 1:

[0050] A process for preparing high-strength multi-layer composite thermal insulation packaging paper comprises the following steps:

[0051] S1. Processing of metallurgical waste slag: cleaning the metallurgical waste slag, then grinding and filtering it to reduce its particle size to less than 100 microns, and then drying it to a dryness of more than 90%;

[0052] S2. Pulp processing: waste paper is shredded, de-inked, filtered and pulped to obtain waste paper pulp; natural wood is crushed, cut, chemically pulped, dehydrated and filtered to obtain virgin wood pulp; then the waste paper pulp and virgin wood pulp are evenly mixed in a ratio of 80%:20%;

[0053] S3. Preparation of packaging paper pulp: uniformly mix the processed metallurgical waste slag and the processed pulp in a ratio of 30%:70%. After the uniform mixing, add corresponding auxiliary materials and then uniformly mix them;

[0054] S4, paper preparation: after the packaging paper pulp is prepared, the packaging paper pulp is formed, pressed and dried to form preliminary paper;

[0055] S5. Wrapping paper processing: After the paper is prepared, the paper is coated, compounded, dried and shaped to obtain the wrapping paper;

[0056] S6. Subsequent testing: The finished packaging paper is tested, and the test items include paper strength, moisture resistance, and thermal insulation.

[0057] The amount of auxiliary materials added in step S3 is 10 of the total amount of packaging paper pulp. The auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, and barium sulfate, and their proportions by weight are 3:6:3:1:3:10:2.

[0058] The forming in step S4 is to form the mixed packaging paper pulp into wet paper sheets through a vacuum forming machine, the pressing is to squeeze the wet paper sheets through a multi-roll press to remove excess water, and the moisture content of the wet paper sheets after pressing is 48%, and the drying is to dry the squeezed paper sheets through a hot air dryer, and the dryness of the initially shaped paper is 90%.

[0059] In step S5, the packaging paper includes lining paper, core paper, and surface paper. The coating is to uniformly coat the lining paper, core paper, and surface paper with one or more of thermal insulation materials, foaming materials, film materials, and adhesives. The foaming material includes blast furnace slag extracted from metallurgical waste slag.

[0060] In step S5, the compounding is to combine the lining paper, the core paper and the surface paper together through a compounding machine to obtain packaging paper, the drying is to dry the moisture in the packaging paper through a hot air dryer to make its moisture content 7%, and the shaping is to calender the packaging paper and cut it into the required size.

[0061] Embodiment 2:

[0062] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0063] S3. Preparation of packaging paper pulp: evenly mix the processed metallurgical waste slag and the processed pulp in a ratio of 10%:90%. After evenly mixing, add corresponding auxiliary materials and evenly mix again.

[0064] Embodiment 3:

[0065] The difference between this embodiment and the above-mentioned embodiment 1 is that:

[0066] S3. Preparation of packaging paper pulp: evenly mix the processed metallurgical waste slag and the processed pulp in a ratio of 20%:80%. After evenly mixing, add corresponding auxiliary materials and evenly mix again.

[0067] Table 1:

[0068] contrast Example 1 Example 2 Example 3 Standard value Tear strength(g) 260 220 240 200 Compressive strength(kPa) 8 6 7 5 Water absorption rate 6％ 8％ 7％ 8％

[0069] The comparison in Table 1 above is the tear strength, compressive strength and moisture absorption rate of packaging paper. It can be seen from Table 1 that the mixing of metallurgical waste slag and pulp in different proportions can affect the tear strength, compressive strength and moisture absorption rate of paper, and then affect the strength of packaging paper, thereby reducing the use of virgin wood pulp and reducing the waste of living resources.

[0070] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A process for preparing high-strength multi-layer composite thermal insulation packaging paper, characterized in that: The following steps are involved: S1. Processing of metallurgical waste slag: cleaning the metallurgical waste slag, then grinding and filtering it to reduce its particle size to less than 100 microns, and then drying it to a dryness of more than 90%; S2. Pulp processing: waste paper is shredded, de-inked, filtered and pulped to obtain waste paper pulp; natural wood is crushed, cut, chemically pulped, dehydrated and filtered to obtain virgin wood pulp; then the waste paper pulp and virgin wood pulp are evenly mixed in a ratio of 80%-60%:20%-40%; S3. Preparation of packaging paper pulp: uniformly mix the processed metallurgical waste slag and the processed pulp in a ratio of 10%-30%:90%-70%. After the uniform mixing, add the corresponding auxiliary materials and then uniformly mix them; S4, paper preparation: after the packaging paper pulp is prepared, the packaging paper pulp is formed, pressed and dried to form preliminary paper; S5. Wrapping paper processing: After the paper is prepared, the paper is coated, compounded, dried and shaped to obtain the wrapping paper; S6. Subsequent testing: The finished packaging paper is tested, and the test items include paper strength, moisture resistance, and thermal insulation.

2. The process for preparing a high-strength multi-layer composite thermal insulation packaging paper according to claim 1, characterized in that: The amount of auxiliary materials added in step S3 is 5%-15% of the total amount of packaging paper pulp. The auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, and barium sulfate, and their weight proportions are 1-5:2-10:1-5:0.5-2:1-5:5-15:1-3.

3. The process for preparing a high-strength multi-layer composite thermal insulation packaging paper according to claim 1, characterized in that: The forming in step S4 is to form the mixed packaging paper pulp into wet paper sheets through a vacuum forming machine, the pressing is to squeeze the wet paper sheets through a multi-roll press to remove excess water, and the moisture content of the wet paper sheets after pressing is 35%-60%, and the drying is to dry the squeezed paper sheets through a hot air dryer, and the dryness of the initially shaped paper is 85%-95%.

4. The process for preparing a high-strength multi-layer composite thermal insulation packaging paper according to claim 1, characterized in that: In step S5, the packaging paper includes lining paper, core paper, and surface paper, and the coating is to uniformly coat the lining paper, core paper, and surface paper with one or more of thermal insulation materials, foaming materials, film materials, and adhesives, and the foaming material includes blast furnace slag extracted from metallurgical waste slag.

5. The process for preparing a high-strength multi-layer composite thermal insulation packaging paper according to claim 1, characterized in that: The compounding in step S5 is to combine the lining paper, the core paper and the surface paper together by a compounding machine to obtain packaging paper, the drying is to dry the moisture in the packaging paper by a hot air dryer to make its moisture content 5%-10%, and the shaping is to calender the packaging paper and cut it into a required size.

6. A high-strength multi-layer composite thermal insulation packaging paper processing equipment, characterized in that: A process for preparing a high-strength, multi-layer composite thermal insulation packaging paper as described in any one of claims 1 to 5, comprising the following equipment: metallurgical waste slag processing equipment, used for cleaning, grinding, filtering and drying metallurgical waste slag; waste paper pulp preparation equipment, used for shredding, deinking, filtering and pulping the waste slag; virgin wood pulp preparation equipment, used for crushing, cutting, chemical pulping, dehydrating and filtering natural wood; a high shear mixer, used for uniformly mixing the pulp; paper preparation equipment, used for molding, pressing and drying packaging paper pulp; packaging paper processing equipment; used for coating, compounding, drying and shaping paper; testing equipment, used for testing paper strength, moisture resistance and thermal insulation.

7. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 6, characterized in that: The metallurgical waste slag processing equipment includes an ultrasonic cleaner for cleaning metallurgical waste slag; a high-energy ball mill for grinding metallurgical waste slag; a multi-stage filter for filtering the ground metallurgical waste slag; a vacuum dryer for drying the metallurgical waste slag; the paper preparation equipment includes a vacuum forming machine for forming packaging paper pulp into paper; a multi-roll press for squeezing the formed paper to remove excess moisture; a hot air dryer for drying the squeezed paper sheets, and the vacuum forming machine is provided with an ultraviolet sterilizer for sterilizing the packaging paper pulp.

8. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 6, characterized in that: The waste paper pulp preparation equipment and the virgin wood pulp preparation equipment both include a crusher for crushing waste paper or wood; a pulping machine for pulping the crushed waste paper or wood pulp; a bleaching machine for bleaching the waste paper pulp or virgin wood pulp; a filter for filtering impurities in the waste paper pulp or impurities in the virgin wood pulp; the waste paper pulp preparation equipment also includes a deinking machine for deinking the waste paper pulp.

9. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 6, characterized in that: The packaging paper processing equipment includes a coating machine, which is used to evenly coat the inner paper, core paper and surface paper with one or more of thermal insulation materials, foaming materials, film materials and adhesives; a compounding machine, which is used to combine the inner paper, core paper and surface paper together; a hot air dryer, which is used to dry the compounded paper to obtain packaging paper; a calender, which is used to adjust the flatness and glossiness of the packaging paper, and a cutting machine, which is used to divide the calendered packaging paper accordingly; the testing equipment includes a tensile testing machine, which is used to test the tensile strength of the packaging paper; Moisture-proof tester is used to test the moisture-proof performance of packaging paper; thermal insulation tester is used to test the thermal insulation performance of packaging paper.

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