A chipless anti-rust paper and a preparation process thereof

Abstract

This invention belongs to the field of metal rust prevention technology and discloses a lint-free rust-preventive paper. The rust-preventive paper uses polyethylene woven fabric as a strength support and rust-preventive base paper or non-woven fabric as a carrier. It is composite-molded with water-based vapor phase corrosion inhibitors and high-pressure polyethylene materials, and then subjected to high-density perforation. By using high-strength polyethylene woven fabric as a support and undergoing a special high-density perforation treatment, this invention effectively reduces friction on the end face of steel coils during transportation and lifting, thus avoiding the problem of paper residue on the end face. This not only ensures the integrity of the steel coils during storage and transportation but also significantly reduces the risk of paper residue sticking to the mold during stamping in automobile manufacturing enterprises, ensuring the quality and consistency of stamped materials and effectively avoiding economic losses caused by defects.

Description

Technical Field

[0001] This invention belongs to the field of metal rust prevention technology, specifically a lint-free rust-preventive paper and its preparation process. Background Technology

[0002] While traditional rust-proof packaging materials provide some protection against rust when packaging steel coils, the ends of the coils are inevitably subjected to friction after undergoing complex logistics processes such as long-distance transportation, multiple lifting and stacking. This friction can not only wear down the rust-proof coating but also easily cause the packaging material (especially packaging containing paper components) to generate debris, which then remains on the ends of the steel coils.

[0003] For downstream automotive manufacturers, when steel coils with paper residue enter the production line for stamping, the paper residue easily adheres to the surface of the precision stamping dies. As a key factor determining the quality of stamped parts, any foreign matter on the die surface can interfere with the forming process. Paper residue adhesion not only affects the surface finish and precision of the stamped parts but can also accelerate die wear, even causing die damage, leading to defects in the stamped material. These defects not only reduce the product yield and increase rework and scrap costs but can also affect the overall quality and safety of the vehicle, thereby damaging the brand image and market competitiveness of the automotive manufacturer. Therefore, automotive manufacturers often impose strict quality requirements on suppliers and file complaints and claims regarding problems caused by paper residue on the steel coil end faces.

[0004] As suppliers of steel coils, major steel companies in my country receive numerous complaints from downstream users annually, incurring corresponding economic losses, including compensation for customer damages, costs of repairing or replacing damaged molds, and sales losses due to product defects. Furthermore, frequent complaints can damage the reputation and customer relationships of steel companies, threatening their long-term development. Therefore, improvements to rust-preventive paper are necessary. Summary of the Invention

[0005] The purpose of this invention is to provide a lint-free rust-proof paper and its preparation process to solve the problems mentioned in the background art.

[0006] To achieve the above objectives, the present invention provides the following technical solution: a rust-proof paper without chips, wherein the rust-proof paper is made of polyethylene woven fabric as a strength support, and the rust-proof paper is made of rust-proof base paper or non-woven fabric as a carrier, and is compounded with water-based vapor phase corrosion inhibitor and high-pressure polyethylene material, and then made by high-density perforation.

[0007] Preferably, the preparation process of this lint-free rust-proof paper is as follows:

[0008] Step 1, Coating with water-based vapor phase corrosion inhibitor: Apply water-based vapor phase corrosion inhibitor evenly to the carrier;

[0009] Step 2, drying treatment: The carrier coated with corrosion inhibitor is dried to remove moisture; the moisture content of the dried product should be controlled at 3-5% of the total product weight.

[0010] Step 3, Composite Molding: High-pressure polyethylene is used to composite the polyethylene woven fabric with the carrier.

[0011] Step 4, Surface coating with high-pressure polyethylene: High-pressure polyethylene is coated onto the surface of the carrier;

[0012] Step 5, high-density perforation: The carrier coated with high-pressure polyethylene is passed through the end film needle roller; high-density perforation is performed on the carrier to complete the final manufacturing of the product.

[0013] Preferably, the rust-proof base paper or non-woven carrier has at least one additional reinforcing layer, which is composed of fibrous material or polymer film, to improve the strength and durability of the rust-proof paper.

[0014] Preferably, the corrosion inhibitor comprises at least one or more rust inhibitors selected from the following components: dicyclohexylamine nitrite, benzotriazole, sodium molybdate or sodium tungstate, and appropriate amounts of solvent and stabilizer to provide long-term and effective rust protection.

[0015] Preferably, the drying process in step two includes the following steps:

[0016] S1, Preheating stage: The carrier coated with water-based vapor phase corrosion inhibitor is sent into the preheating zone of the drying equipment, and the carrier is initially heated by hot air or infrared radiation.

[0017] S2, Drying stage: The carrier is sent into the drying zone and dried using hot air circulation. Through continuous circulation of hot air, the moisture on the surface and inside of the carrier is evenly heated and evaporated. Infrared drying utilizes the penetrating power of infrared rays to directly heat the moisture inside the carrier, accelerating its evaporation process.

[0018] S3, Cooling stage: After drying, the carrier enters the cooling zone, where the temperature is reduced to room temperature or close to room temperature through natural cooling or forced ventilation to avoid changes in the performance of the corrosion inhibitor due to excessive temperature during subsequent processing or storage.

[0019] S4, Moisture content testing: At the final stage or after the drying process, the moisture content of the product is tested to ensure that the moisture content of the dried product is controlled within 3-5% of the overall product quality.

[0020] Preferably, in the composite molding process of step three, an adhesive layer is added between the polyethylene woven fabric and the carrier to improve the bonding strength and sealing between the two.

[0021] Preferably, the specific steps of the composite molding in step three are as follows:

[0022] A1. Material preparation and equipment debugging: Ensure that the rust-proof base paper or non-woven fabric is clean and dry to avoid impurities or moisture affecting the lamination effect; check the temperature and parameters of the hot press laminating machine.

[0023] A2, Coating: A layer of high-pressure polyethylene hot melt adhesive is uniformly coated onto the surface of the polyethylene woven fabric or carrier.

[0024] A3, Hot-press lamination: Polyethylene woven fabric coated with high-pressure polyethylene hot melt adhesive or molten high-pressure polyethylene is stacked together with a carrier and fed into a hot-press lamination machine; under temperature and pressure, the high-pressure polyethylene penetrates into the fiber gaps of the woven fabric and the carrier to form a strong composite structure.

[0025] A3, Cooling and Shaping: After lamination, the product is removed from the hot press laminating machine and cooled to solidify and shape the high-pressure polyethylene.

[0026] A4, Quality Inspection: Check whether the surface of the laminated product is flat, free of bubbles, and free of cracks or defects.

[0027] Preferably, the high-density drilling in step five includes the following steps:

[0028] B1. Equipment Inspection and Parameter Setting: Ensure the normal operation of the end film needle roller punching equipment, check whether the needle tips of the needle roller are sharp and neatly arranged, and whether the transmission system of the equipment is smooth; set the parameters of the punching equipment, including the hole diameter, hole spacing, punching speed and punching depth.

[0029] The carrier coated with high-pressure polyethylene is placed flat at the feed inlet of the punching equipment to ensure that the carrier can pass through smoothly and continuously during the punching process.

[0030] B2, Perforation process: Start the perforation equipment and feed the carrier under the end film needle roller; ensure that the carrier remains flat during the feeding process to avoid wrinkles or displacement;

[0031] When the carrier passes through the needle roller, the needle tips on the needle roller will form dense holes on the carrier;

[0032] B3. Collection and Inspection: After drilling is completed, collect the punched carrier and conduct a preliminary inspection to check whether the holes are uniform, whether there are any omissions, and whether there is any damage.

[0033] The beneficial effects of this invention are as follows:

[0034] This invention utilizes high-strength polyethylene woven fabric as a support, and undergoes a special high-density perforation treatment. This effectively reduces friction on the end face of steel coils during transportation and lifting, thus preventing paper residue from remaining on the end face. This not only ensures the integrity of the steel coils during storage and transportation but also significantly reduces the risk of paper residue sticking to the mold during stamping for automobile manufacturers, guaranteeing the quality and consistency of the stamped materials and effectively avoiding economic losses caused by defects.

[0035] After a year-long physical packaging test of four rolls, the steel rolls showed no rust, paper scraps, or other impurities after the packaging was removed in March, June, September, and December. Attached Figure Description

[0036] Figure 1 This is a flowchart illustrating the preparation process of the lint-free rust-proof paper of the present invention. Detailed Implementation

[0037] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0038] like Figure 1 As shown, this embodiment of the invention provides a lint-free rust-proof paper. The rust-proof paper uses polyethylene woven fabric as a strength support and rust-proof base paper or non-woven fabric as a carrier. It is then composited with water-based vapor phase corrosion inhibitor and high-pressure polyethylene material, and finally made by high-density perforation.

[0039] The preparation process of this lint-free rust-proof paper is as follows:

[0040] Step 1, Coating with water-based vapor phase corrosion inhibitor: Apply water-based vapor phase corrosion inhibitor evenly to the carrier;

[0041] Step 2, drying treatment: The carrier coated with corrosion inhibitor is dried to remove moisture; the moisture content of the dried product should be controlled at 3-5% of the total product weight.

[0042] Step 3, Composite Molding: High-pressure polyethylene is used to composite the polyethylene woven fabric with the carrier.

[0043] Step 4, Surface coating with high-pressure polyethylene: High-pressure polyethylene is coated onto the surface of the carrier; the surface-coated high-pressure polyethylene layer may contain UV-resistant additives or antioxidants to improve the weather resistance and service life of the rust-proof paper.

[0044] Step 5, High-Density Perforation: The carrier coated with high-pressure polyethylene is passed through the end film needle roller; high-density perforation is performed on the carrier to complete the final manufacturing of the product. The size and distribution of the high-density perforations can be adjusted according to specific application requirements to achieve different air permeability and rust prevention effects.

[0045] The rust-proof base paper or non-woven fabric carrier has at least one additional reinforcing layer, which is composed of fibrous material or polymer film to improve the strength and durability of the rust-proof paper.

[0046] The water-based vapor phase corrosion inhibitor contains at least one or more rust inhibitors selected from the following components: dicyclohexylamine nitrite, benzotriazole, sodium molybdate or sodium tungstate, as well as appropriate amounts of solvent and stabilizer to provide long-term and effective rust protection.

[0047] In step two, the specific steps of the drying process are as follows:

[0048] S1, Preheating Stage: The carrier coated with water-based vapor phase corrosion inhibitor is sent to the preheating zone of the drying equipment, where it is initially heated using hot air or infrared radiation to accelerate the evaporation of surface moisture. The preheating temperature should be controlled within a certain range to avoid premature decomposition or inactivation of the corrosion inhibitor components due to excessively high temperatures.

[0049] S2, Drying Stage: The carrier is sent into the drying zone, which uses hot air circulation drying or infrared drying technology. Hot air circulation drying ensures that the moisture on the surface and inside of the carrier is evenly heated and evaporated through continuous circulation of hot air. Infrared drying utilizes the penetrating power of infrared rays to directly heat the moisture inside the carrier, accelerating its evaporation process. The drying temperature and time should be adjusted according to the material and thickness of the carrier, as well as the type and amount of corrosion inhibitor, to ensure that the corrosion inhibitor dries evenly and reaches the required degree of dryness.

[0050] S3, Cooling stage: After drying, the carrier enters the cooling zone, where the temperature is reduced to room temperature or close to room temperature through natural cooling or forced ventilation to avoid changes in the performance of the corrosion inhibitor due to excessive temperature during subsequent processing or storage.

[0051] S4, Moisture content testing: At the final stage or after the drying process, the moisture content of the product is tested to ensure that the moisture content of the dried product is controlled within 3-5% of the overall product quality; this can be done quickly and accurately using equipment such as a moisture meter.

[0052] In the composite molding process of step three, an adhesive layer is added between the polyethylene woven fabric and the carrier to improve the bonding strength and sealing between the two.

[0053] The specific steps of composite molding in step three are as follows:

[0054] A1. Material preparation and equipment debugging: Ensure that the rust-proof base paper or non-woven fabric is clean and dry to avoid impurities or moisture affecting the lamination effect; check the temperature and parameters of the hot press laminating machine.

[0055] A2. Adhesive Coating: Apply a uniform layer of high-pressure polyethylene hot melt adhesive to the surface of the polyethylene woven fabric or carrier; alternatively, heating can be used to melt the high-pressure polyethylene for better bonding of the two materials. The amount of adhesive applied or the degree of melting should be adjusted according to the type and thickness of the materials and the required composite strength.

[0056] A3, Hot-press lamination: Polyethylene woven fabric coated with high-pressure polyethylene hot melt adhesive or molten high-pressure polyethylene is stacked together with a carrier and fed into a hot-press lamination machine; under temperature and pressure, the high-pressure polyethylene penetrates into the fiber gaps of the woven fabric and the carrier to form a strong composite structure; the hot-pressing temperature, pressure and time should be optimized according to the characteristics of the materials and the desired lamination effect.

[0057] A3, Cooling and Shaping: After lamination, the product is removed from the hot press laminating machine and cooled to solidify and shape the high-pressure polyethylene. Cooling methods can include natural cooling or forced ventilation, depending on the production environment and equipment conditions.

[0058] A4, Quality Inspection: Check whether the surface of the laminated product is flat, free of bubbles, and free of cracks or defects.

[0059] Step five, high-density drilling, includes the following steps:

[0060] B1. Equipment Inspection and Parameter Setting: Ensure the normal operation of the end film needle roller punching equipment, check whether the needle tips of the needle roller are sharp and neatly arranged, and whether the transmission system of the equipment is smooth; set the parameters of the punching equipment, including the hole diameter, hole spacing, punching speed and punching depth.

[0061] The carrier coated with high-pressure polyethylene is placed flat at the feed inlet of the punching equipment to ensure that the carrier can pass through smoothly and continuously during the punching process.

[0062] B2, Perforation process: Start the perforation equipment and feed the carrier under the end film needle roller; ensure that the carrier remains flat during the feeding process to avoid wrinkles or displacement;

[0063] When the carrier passes through the needle roller, the needle tips on the needle roller will form dense holes on the carrier; according to the set parameters, the punching equipment will automatically adjust the rotation speed and punching depth of the needle roller to ensure that the size and position of each hole meet the design requirements.

[0064] B3. Collection and Inspection: After drilling is completed, collect the punched carrier and conduct a preliminary inspection to check whether the holes are uniform, whether there are any omissions, and whether there is any damage.

[0065] It should be noted that, in this document, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such process, method, article, or apparatus.

[0066] Although embodiments of the invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the appended claims and their equivalents.

Claims

1. A non-chipping rust preventive paper, characterized by: The rust-proof paper uses polyethylene woven fabric as a strength support. The rust-proof paper is made by combining water-based vapor phase corrosion inhibitor and high-pressure polyethylene material with rust-proof base paper or non-woven fabric as carrier, and then making it with high-density perforation.

2. The process for manufacturing a chipless rust-proof paper according to claim 1, characterized in that: The preparation process of this lint-free rust-preventive paper is as follows: Step 1, Coating with water-based vapor phase corrosion inhibitor: Apply water-based vapor phase corrosion inhibitor evenly to the carrier; Step 2, drying treatment: The carrier coated with corrosion inhibitor is dried to remove moisture; the moisture content of the dried product should be controlled at 3-5% of the total product weight. Step 3, Composite Molding: High-pressure polyethylene is used to composite the polyethylene woven fabric with the carrier. Step 4, Surface coating with high-pressure polyethylene: High-pressure polyethylene is coated onto the surface of the carrier; Step 5, high-density perforation: The carrier coated with high-pressure polyethylene is passed through the end film needle roller; high-density perforation is performed on the carrier to complete the final manufacturing of the product.

3. A chipless rust-proof paper according to claim 1, characterized in that: The rust-proof base paper or non-woven fabric carrier has at least one additional reinforcing layer, which is composed of fibrous material or polymer film to improve the strength and durability of the rust-proof paper.

4. A chipless rust-proof paper according to claim 1, characterized in that: The water-based vapor phase corrosion inhibitor contains at least one or more rust inhibitors selected from the following components: dicyclohexylamine nitrite, benzotriazole, sodium molybdate or sodium tungstate, and appropriate amounts of solvent and stabilizer to provide long-term and effective rust protection.

5. The process for manufacturing a chipless rust-proof paper according to claim 2, characterized in that: The specific steps of the drying process in step two are as follows: S1, Preheating stage: The carrier coated with water-based vapor phase corrosion inhibitor is sent into the preheating zone of the drying equipment, and the carrier is initially heated by hot air or infrared radiation. S2, Drying stage: The carrier is sent into the drying zone and dried using hot air circulation. Through continuous circulation of hot air, the moisture on the surface and inside of the carrier is evenly heated and evaporated. Infrared drying utilizes the penetrating power of infrared rays to directly heat the moisture inside the carrier, accelerating its evaporation process. S3, Cooling stage: After drying, the carrier enters the cooling zone, where the temperature is reduced to room temperature or close to room temperature through natural cooling or forced ventilation to avoid changes in the performance of the corrosion inhibitor due to excessive temperature during subsequent processing or storage. S4, Moisture content testing: At the final stage or after the drying process, the moisture content of the product is tested to ensure that the moisture content of the dried product is controlled within 3-5% of the overall product quality.

6. The process for manufacturing a chipless rust-proof paper according to claim 2, wherein: In the composite molding process of step three, an adhesive layer is added between the polyethylene woven fabric and the carrier to improve the bonding strength and sealing between the two.

7. The process for manufacturing a chipless rust-proof paper according to claim 2, characterized in that: The specific steps of the composite molding in step three are as follows: A1. Material preparation and equipment debugging: Ensure that the rust-proof base paper or non-woven fabric is clean and dry to avoid impurities or moisture affecting the lamination effect; check the temperature and parameters of the hot press laminating machine. A2, Coating: A layer of high-pressure polyethylene hot melt adhesive is uniformly coated onto the surface of the polyethylene woven fabric or carrier. A3, Hot-press lamination: Polyethylene woven fabric coated with high-pressure polyethylene hot melt adhesive or molten high-pressure polyethylene is stacked together with a carrier and fed into a hot-press lamination machine; under temperature and pressure, the high-pressure polyethylene penetrates into the fiber gaps of the woven fabric and the carrier to form a strong composite structure. A3, Cooling and Shaping: After lamination, the product is removed from the hot press laminating machine and cooled to solidify and shape the high-pressure polyethylene. A4, Quality Inspection: Check whether the surface of the laminated product is flat, free of bubbles, and free of cracks or defects.

8. The process for manufacturing a chipless rust-proof paper according to claim 2, characterized in that: The high-density drilling in step five includes the following steps: B1. Equipment Inspection and Parameter Setting: Ensure the normal operation of the end film needle roller punching equipment, check whether the needle tips of the needle roller are sharp and neatly arranged, and whether the transmission system of the equipment is smooth; set the parameters of the punching equipment, including the hole diameter, hole spacing, punching speed and punching depth. The carrier coated with high-pressure polyethylene is placed flat at the feed inlet of the punching equipment to ensure that the carrier can pass through smoothly and continuously during the punching process; B2, Perforation process: Start the perforation equipment and feed the carrier under the end film needle roller; ensure that the carrier remains flat during the feeding process to avoid wrinkles or displacement; When the carrier passes through the needle roller, the needle tips on the needle roller will form dense holes on the carrier; B3. Collection and Inspection: After drilling is completed, collect the punched carrier and conduct a preliminary inspection to check whether the holes are uniform, whether there are any omissions, and whether there is any damage.

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