Preparation process and processing equipment for a high-strength multi-layer composite heat-insulating wrapping paper

Abstract

The present invention relates to the field of packaging paper processing, and discloses a preparation process and processing equipment for a high-strength multi-layer composite heat-insulating packaging paper. The preparation process of the high-strength multi-layer composite heat-insulating packaging paper includes the following steps: S1. Metallurgical waste residue processing: cleaning the metallurgical waste residue, then grinding and filtering it, and then drying it; S2. Pulp processing: S3. Preparation of packaging paper pulp: uniformly mixing the processed metallurgical waste residue with the processed pulp; S4. Formation of paper; S5. Packaging paper processing: after the paper is prepared, coating, compounding, drying, and shaping are carried out on the paper to obtain the packaging paper; S6. Subsequent detection. By cleaning, grinding, and filtering the metallurgical waste residue, its bonding degree with the pulp is enhanced and the moisture content of the pulp is prevented from being affected; by uniformly mixing the processed metallurgical waste residue with the processed pulp in proportion, the strength and durability of the paper are improved, and the usage amount of virgin wood pulp is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of packaging paper processing, and specifically relates to a preparation process and processing equipment for a high-strength multi-layer composite heat-insulating packaging paper. Background Art

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

[0003] The raw materials for preparing packaging paper generally use two raw materials, virgin wood pulp and waste paper wood pulp. Virgin wood pulp has better burst strength and performance, but the cost is higher. Waste paper wood pulp has a lower cost, but its strength is poorer compared with virgin wood pulp. For the preparation of high-strength multi-layer composite heat-insulating packaging paper, in order to ensure that its strength meets the standard, its raw materials are mostly virgin wood pulp, resulting in relatively wasteful use of living resources during its manufacturing. Summary of the Invention

[0004] In view of the deficiencies of the prior art, the present invention provides a preparation process and processing equipment for a high-strength multi-layer composite heat-insulating packaging paper, and solves the problem that for the preparation of high-strength multi-layer composite heat-insulating packaging paper, in order to ensure that its strength meets the standard, its raw materials are mostly virgin wood pulp, resulting in relatively wasteful use of living resources during its manufacturing.

[0005] To achieve the above objectives, the present invention is realized through the following technical solutions: A preparation process for a high-strength multi-layer composite heat-insulating packaging paper includes the following steps:

[0006] S1. Metallurgical slag processing: Clean the metallurgical slag, then grind and filter it to make its particle size reach below 100 microns, and then dry it to make its dryness reach more than 90%;

[0007] S2. Pulp processing: Shred, de-ink, filter and pulp waste paper to obtain waste paper pulp; Crush, cut, chemically pulp, dehydrate and filter natural wood to obtain virgin wood pulp; Then evenly mix the waste paper pulp and virgin wood pulp, and the ratio is 80%-60%:20%-40%;

[0008] S3. Preparation of packaging paper pulp: Evenly mix the processed metallurgical slag and the processed pulp, and the ratio is 10%-30%:90%-70%. After the even mixing, add corresponding auxiliary materials and then mix evenly;

[0009] S4. Finished paper preparation: After the packaging paper pulp is prepared, the packaging paper pulp is formed, pressed, and dried to form a preliminary paper.

[0010] S5. Packaging paper processing: After the paper is prepared, the paper is coated, laminated, dried, and shaped to obtain the packaging paper.

[0011] S6. Subsequent inspection: The processed packaging paper is inspected, and the inspection items include paper strength, moisture resistance, and heat preservation.

[0012] Preferably, the addition amount of the auxiliary materials in step S3 is 5%-15% of the total amount of the 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 in sequence.

[0013] Preferably, in step S4, the forming is to form the mixed packaging paper pulp into a wet paper sheet through a vacuum former, the pressing is to squeeze the wet paper sheet through a multi-roll press to remove its excess water, and the water content of the pressed wet paper sheet is 35%-60%. The drying is to dry the extruded paper sheet through a hot air dryer to form a preliminary paper, and its dryness is 85%-95%.

[0014] Preferably, in step S5, the packaging paper includes an inner paper, a core paper, and a surface paper. The coating is to uniformly coat one or more of a heat preservation material, a foaming material, a film material, and an adhesive on the inner paper, the core paper, and the surface paper. The foaming material includes blast furnace slag extracted from metallurgical waste slag.

[0015] Preferably, in step S5, the lamination is to combine the inner paper, the core paper, and the surface paper together through a laminator to obtain the packaging paper. The drying is to dry the water in the packaging paper through a hot air dryer to reduce its water content to 5%-10%. The shaping is to calender the packaging paper and cut it into the required size.

[0016] Preferably, a high-strength multi-layer composite heat-preserving packaging paper processing device includes the following devices: a metallurgical waste slag processing device for cleaning, grinding, filtering, and drying metallurgical waste slag; a waste paper pulp preparation device for shredding, deinking, filtering, and pulping the waste slag; a virgin wood pulp preparation device for crushing, cutting, chemically pulping, dehydrating, and filtering natural wood; a high-shear mixer for uniformly mixing the slurries; a finished paper preparation device for forming, pressing, and drying the packaging paper pulp; a packaging paper processing device for coating, laminating, drying, and shaping the paper; and an inspection device for inspecting the paper strength, moisture resistance, and heat preservation.

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

[0018] Preferably, both the waste paper pulp preparation equipment and the virgin wood pulp preparation equipment include a crusher for crushing waste paper or wood; a pulper for pulping the crushed waste paper or wood pulp; a bleacher for bleaching the waste paper pulp or virgin wood pulp; and a filter for filtering impurities in the waste paper pulp or virgin wood pulp. The waste paper pulp preparation equipment further includes a de-inker for de-inking the waste paper pulp.

[0019] Preferably, the packaging paper processing equipment includes a coater for uniformly coating one or more of a heat-insulating material, a foaming material, a film material, and an adhesive on the inner paper, core paper, and face paper; a laminator for bonding the inner paper, core paper, and face paper together; a hot air dryer for drying the laminated paper to obtain the packaging paper; a calender for adjusting the flatness and gloss of the packaging paper; and a cutter for correspondingly cutting the calendered packaging paper. The testing equipment includes a tensile tester for testing the tensile strength of the packaging paper; a moisture-proof tester for testing the moisture-proof performance of the packaging paper; and a heat-insulation tester for testing the heat-insulation performance of the packaging paper.

[0020] The present invention provides a preparation process and processing equipment for a high-strength multi-layer composite heat-insulating packaging paper, having the following beneficial effects:

[0021] 1. By cleaning, grinding, and filtering the metallurgical waste residue, the present invention enhances its bonding degree with the pulp and avoids affecting the moisture content of the pulp. By uniformly mixing the processed metallurgical waste residue and the processed pulp in proportion, the strength and durability of the paper are improved, and the consumption of virgin wood pulp is reduced, thus solving the problem of preparing a high-strength multi-layer composite heat-insulating packaging paper. To ensure that its strength meets the standard, its raw materials are mostly virgin wood pulp, resulting in waste of living resources during its manufacturing.

[0022] 2. By adding the processed metallurgical waste residue, the properties of the pulp are enhanced, the utilization rate of the metallurgical waste residue is increased, resource waste is reduced, and the addition of the metallurgical waste residue correspondingly improves the fire and water resistance of the paper, thereby enhancing the applicability of the packaging paper; by mixing and adding auxiliary materials, the properties such as the strength, heat resistance, smoothness, and softness of the paper prepared in the subsequent steps of paper formation are enhanced, thereby further enhancing the practicality of the packaging paper. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of the preparation process of a high-strength multi-layer composite thermal insulation packaging paper of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0024] Next, the technical solutions of the present invention will be clearly and completely described in conjunction with the drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

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

[0026] S1. Processing of metallurgical waste residue: Wash the metallurgical waste residue, then grind and filter it to make its particle size reach below 100 microns, and then dry it to make its dryness reach more than 90%;

[0027] Specifically, by washing the metallurgical waste residue, impurities, grease, and other pollutants in the waste residue are removed to ensure the purity of subsequent processing. By grinding the metallurgical waste residue, its particle size reaches below 100 microns to improve the uniformity of its mixing with the pulp and the adaptability of subsequent processing. By drying the ground metallurgical waste residue, its dryness reaches more than 90% to facilitate storage and use, prevent mildew, or affect the moisture content of the pulp during mixing in subsequent steps, thereby enhancing its bonding degree with the pulp in subsequent steps.

[0028] S2. Pulp processing: Shred, de-ink, filter, and pulp waste paper to obtain waste paper pulp; crush, cut, chemically pulp, dehydrate, and filter natural wood to obtain virgin wood pulp; then uniformly mix the waste paper pulp and the virgin wood pulp in a ratio of 80%-60%:20%-40%;

[0029] Specifically, by uniformly mixing the waste paper pulp and the 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. Packaging paper pulp preparation: The processed metallurgical waste residue is evenly mixed with the processed pulp, and the ratio is 10%-30%: 90%-70%. After the even mixing, corresponding auxiliary materials are added and then evenly mixed again;

[0031] Specifically, by evenly mixing the processed metallurgical waste residue with the processed pulp, the properties of the pulp are enhanced, the strength and durability of the paper prepared in the subsequent steps are improved, and at the same time, its application value and environmental protection performance are improved, resource waste is reduced, and the addition of metallurgical waste residue correspondingly improves the fire and water resistance of the paper, thus enhancing the applicability of the packaging paper; by the mixed addition of auxiliary materials, the strength, heat resistance, smoothness and softness of the paper prepared in the subsequent steps are enhanced, thus enhancing the practicality of the packaging paper.

[0032] S4. Formed paper preparation: After the packaging paper pulp preparation is completed, the packaging paper pulp is formed, pressed and dried to form a preliminary paper;

[0033] Specifically, by forming, pressing and drying the packaging paper pulp, a preliminary paper is formed, which has a certain strength and dryness and is convenient for subsequent processing steps.

[0034] S5. Packaging paper processing: After the paper preparation is completed, the paper is coated, laminated, dried and shaped to obtain the packaging paper;

[0035] Specifically, the paper is coated, laminated, dried and shaped to obtain the packaging paper.

[0036] S6. Subsequent inspection: The processed packaging paper is inspected, and the inspection items include paper strength, moisture resistance and heat preservation.

[0037] Specifically, by inspecting the processed packaging paper, the quality of the final product is ensured, the reliability and stability of the packaging paper during use are ensured, quality complaints caused by material problems are avoided, the customer satisfaction is improved, and through the gradual implementation of the above steps, a high-strength multi-layer composite heat-insulating packaging paper can be prepared, and the consumption of virgin wood pulp is reduced, thus solving the problem of the preparation of high-strength multi-layer composite heat-insulating packaging paper. To ensure the compliance of its strength, its raw materials are mostly virgin wood pulp, resulting in waste of living resources during its manufacture.

[0038] The addition amount of the auxiliary materials in step S3 is 5%-15% of the total amount of the packaging paper pulp. The auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, barium sulfate, and their ratio by weight is 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 the paper. The addition of starch and polyurethane helps to improve the flexibility and water resistance of the paper. The addition of talcum powder and calcium carbonate can increase the smoothness, whiteness of the paper and improve the printing performance. The use of xanthan gum can improve the rheological properties of the pulp, and enhance the uniformity and stability of the forming process.

[0040] In step S4, forming means forming the mixed packaging paper pulp into a wet paper sheet through a vacuum former, pressing means squeezing the wet paper sheet through a multi-roll press to remove its excess moisture. The water content of the pressed wet paper sheet is 35%-60%. Drying means drying the pressed paper sheet through a hot air dryer to obtain a paper sheet with a preliminary shape, and its dryness is 85%-95%.

[0041] Specifically, by forming the mixed packaging paper pulp into a wet paper sheet through a vacuum former, the pulp initially forms the structure of the paper, facilitating subsequent processing. By squeezing the wet paper sheet through a multi-roll press, its excess moisture is removed, and the density of the paper is increased, enhancing its strength and toughness. By drying the pressed paper sheet through a hot air dryer to obtain a paper sheet with a preliminary shape, the stability of the dried paper is enhanced, reducing deformation and cracking caused by moisture changes, and facilitating subsequent steps.

[0042] In step S5, the packaging paper includes an inner paper, a core paper, and a face paper. Coating means uniformly coating one or more of heat-insulating materials, foaming materials, film materials, and adhesives on the inner paper, core paper, and face paper. The foaming material includes blast furnace slag extracted from metallurgical waste slag. Composing in S5 means combining the inner paper, core paper, and face paper together through a laminator to obtain the packaging paper. Drying means drying the moisture in the packaging paper through a hot air dryer to reduce its water content to 5%-10%. Shaping means calendering and cutting the packaging paper into the required size.

[0043] Specifically, through coating, the paper can be made to have functions such as heat insulation, barrier, and adhesion, enhancing its performance in specific environments. Through composing, the advantages of different layers of paper can be combined to form a stronger and more ductile packaging paper. By further drying the moisture in the packaging paper through a hot air dryer to make its water content appropriate, the performance decline of the paper caused by dampness or excessive dryness is avoided. By calendering and cutting the packaging paper 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 device includes the following equipment: a metallurgical waste residue processing device for cleaning, grinding, filtering, and drying metallurgical waste residues; a waste paper pulp preparation device for shredding, deinking, filtering, and pulping the waste residues; a virgin wood pulp preparation device for crushing and cutting natural wood, chemical pulping, dewatering, and filtering; a high-shear mixer for uniformly mixing the slurries; a paper forming device for forming, pressing, and drying the packaging paper pulp; a packaging paper processing device for coating, laminating, drying, and shaping the paper; and a detection device for detecting the paper strength, moisture resistance, and thermal insulation performance.

[0045] The metallurgical waste residue processing device includes an ultrasonic cleaner for cleaning the metallurgical waste residues; a high-energy ball mill for grinding the metallurgical waste residues; a multi-stage filter for filtering the ground metallurgical waste residues; a vacuum dryer for drying the metallurgical waste residues; the paper forming device includes a vacuum former for forming the packaging paper pulp into paper; a multi-roll press for squeezing the formed paper to remove its excess moisture; a hot air dryer for drying the squeezed paper sheet, and a UV sterilizer is provided inside the vacuum former for sterilizing the packaging paper pulp.

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

[0047] The packaging paper processing device includes a coater for uniformly coating one or more of a thermal insulation material, a foaming material, a film material, and an adhesive on the inner paper, core paper, and surface paper; a laminator for bonding the inner paper, core paper, and surface paper together; a hot air dryer for drying the laminated paper to obtain the packaging paper; a calender for adjusting the flatness and gloss of the packaging paper; a cutter for correspondingly dividing the calendered packaging paper; the detection device includes a tensile tester for testing the tensile strength of the packaging paper; a moisture resistance tester for testing the moisture resistance performance of the packaging paper; and a thermal insulation performance tester for testing the thermal insulation performance of the packaging paper.

[0048] The following is a further introduction in combination with specific embodiments:

[0049] Example 1:

[0050] A high-strength multi-layer composite thermal insulation packaging paper preparation process includes the following steps:

[0051] S1. Metallurgical waste residue processing: Clean the metallurgical waste residue, then grind and filter it to make its particle size less than 100 microns, and then dry it to make its dryness reach more than 90%;

[0052] S2. Pulp processing: Shred, de-ink, filter and pulp waste paper to obtain waste paper pulp; Crush, cut, chemically pulp, dehydrate and filter natural wood to obtain virgin wood pulp; Then evenly mix the waste paper pulp and the virgin wood pulp in a ratio of 80%:20%;

[0053] S3. Packaging paper pulp preparation: Evenly mix the processed metallurgical waste residue and the processed pulp in a ratio of 30%:70%. After the even mixing, add corresponding auxiliary materials and then mix evenly again;

[0054] S4. Paper formation: After the packaging paper pulp is prepared, form, press and dry the packaging paper pulp to form a preliminary paper;

[0055] S5. Packaging paper processing: After the paper is prepared, coat, laminate, dry and shape the paper to obtain the packaging paper;

[0056] S6. Subsequent inspection: Inspect the processed packaging paper, and the inspection items include paper strength, moisture resistance and heat preservation.

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

[0058] In step S4, the forming is to form the mixed packaging paper pulp into a wet paper sheet through a vacuum forming machine. The pressing is to squeeze the wet paper sheet through a multi-roll press to remove its excess water. The water content of the pressed wet paper sheet is 48%. The drying is to dry the pressed paper sheet through a hot air dryer to form a preliminary paper, and its dryness is 90%.

[0059] In step S5, the packaging paper includes an inner paper, a core paper and a face paper. The coating is to evenly coat one or more of heat preservation materials, foaming materials, film materials, and adhesives on the inner paper, the core paper and the face paper. The foaming materials include blast furnace slag extracted from metallurgical waste residue.

[0060] In step S5, the lamination is to combine the inner paper, the core paper and the face paper together through a laminator to obtain the packaging paper. The drying is to dry the water in the packaging paper through a hot air dryer to make its water content drop to 7%. The shaping is to calender and cut the packaging paper into the required size.

[0061] Example 2:

[0062] The difference between this example and the above Example 1 lies in:

[0063] S3. Preparation of wrapping paper pulp: The processed metallurgical waste residue and the processed pulp are evenly mixed in a ratio of 10%:90%. After the even mixing, corresponding auxiliary materials are added and then evenly mixed again.

[0064] Example 3:

[0065] The difference between this example and the above Example 1 lies in:

[0066] S3. Preparation of wrapping paper pulp: The processed metallurgical waste residue and the processed pulp are evenly mixed in a ratio of 20%:80%. After the even mixing, corresponding auxiliary materials are added and then evenly mixed again.

[0067] Table 1:

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

[0069] The comparisons in the above Table 1 are the tear strength, compressive strength, and moisture absorption rate of the wrapping paper. It can be seen from Table 1 that the mixing of metallurgical waste residue and pulp in different ratios can affect the tear strength, compressive strength, and moisture absorption rate of the paper, and thus affect the strength of the wrapping paper, thereby reducing the use of virgin wood pulp and reducing the waste of living resources.

[0070] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. 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: Testing of the finished packaging paper, including paper strength, moisture resistance, and thermal insulation; The amount of the auxiliary materials added in step S3 is 5%-15% of the total amount of the packaging paper pulp, and the auxiliary materials in S3 include cellulose nanocrystals, starch, polyurethane, xanthan gum, talcum powder, calcium carbonate, and barium sulfate, and the proportions thereof by weight are 1-5:2-10:1-5:0.5-2:1-5:5-15:1-3; 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.

2. 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%.

3. 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.

4. 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 3, 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.

5. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 4 is 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.

6. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 4, 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.

7. The high-strength multi-layer composite thermal insulation packaging paper processing equipment according to claim 4 is characterized by: 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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