A method for rust-proof packaging of steel sheets

Abstract

The present application provides a kind of steel sheet rust-proof packaging method, rust-proof paper and first waterproof cloth are selected according to steel sheet bale width, first rust-proof paper is wrapped and sealed to form inner layer rust-proof sealing layer, then first waterproof cloth is wrapped to form middle layer waterproof covering layer;Top waterproof cloth is laid outside middle layer waterproof covering layer, two ends are respectively overstepped the both ends of steel sheet bale after reverse packing to the outside of lower side to form reverse packing terminal;Rectangular wood is arranged at the lower side of steel sheet bale, so that the rectangular wood close to both ends is fixed by pressing reverse packing terminal;It is fixed by being tied with bale band, and buffer protection piece is arranged at the position corresponding to edge of bale band.The present application cooperates with the pressing of rectangular wood by the end of top waterproof cloth reverse packing, to prevent end edge from being warped and retracted and form hidden water seepage channel, meanwhile, buffer protection piece avoids bale band to break packing layer and constraint adhesive tape to paste boundary.

Description

Technical Field

[0001] This invention relates to the field of steel plate rust prevention packaging technology, and in particular to a method for rust prevention packaging of steel plates. Background Technology

[0002] As a core material in industrial production, construction, and machining, steel plates are highly susceptible to defects such as surface oxidation, rust, and discoloration during storage and long-distance transportation. These defects severely impact the performance, appearance, and lifespan of the steel plates, leading to significant economic losses. Therefore, rust-proof packaging before steel plates leave the factory is a crucial process for ensuring product quality.

[0003] Current steel plate rust-proof packaging processes have several shortcomings: First, the packaging materials lack adaptability, failing to establish a standardized matching system for rust-proof paper, waterproof cloth, and dunnage for steel plates of different widths. This often results in waste due to excessively large materials and incomplete wrapping due to undersized materials, leading to blind spots in rust protection. Second, the packaging process is not standardized, often employing single-layer wrapping, resulting in poor sealing and leaks at seams and ends, allowing moisture to easily penetrate and cause steel plate corrosion. Third, the protective structure is unreasonable, with strapping directly against the edges of the steel plate, easily causing edge wear, and tightening the straps can damage the packaging. Concentrated pressure on the layers can easily cause the outer waterproof material to be cut or worn through at the edges, creating new water ingress points; at the same time, tape is often directly bonded to the steel plate surface, and residual adhesive residue is difficult to clean, damaging the flatness of the steel plate surface; fourth, there are no standardized parameters for the laying of dunnage and the fixing of bundles, resulting in poor bundle stability, easy loosening and misalignment during transportation, and aggravating wear and corrosion; fifth, the bundle information traceability system is imperfect, and the identification, records, and physical information are prone to deviation, which is not conducive to product traceability management; at the same time, there are no standardized restrictions on the application range of the outer tape, which can easily exceed the protective boundary, affecting the packaging's aesthetics and protective performance.

[0004] Therefore, it is necessary to propose a rust-proof packaging method for steel plates to solve or at least alleviate the above-mentioned defects. Summary of the Invention

[0005] The main objective of this invention is to provide a method for rust-proof packaging of steel plates, in order to solve the technical problems in existing rust-proof packaging of steel plates, such as the fact that the ends of the packaging material are prone to warping and shrinking under transportation vibration, forming hidden water seepage channels, and that the strapping straps can easily cause damage to the edges of the packaging layer and water ingress, and that the lack of boundary constraints in the tape adhesion leads to adhesive residue on the surface of the steel plate.

[0006] To achieve the above objectives, the present invention provides a method for rust-proof packaging of steel plates, comprising the following steps: S1. Based on the width of the steel plate bundle to be packaged, select rust-proof paper and a first waterproof cloth of corresponding size. First, wrap the steel plate bundle with the rust-proof paper and seal the overlap and end seal of the rust-proof paper to form an inner rust-proof sealing layer. Then, wrap it with the first waterproof cloth to form a middle waterproof covering layer. The steel plate bundle has a length direction and a first end and a second end that are arranged opposite to each other along the length direction. S2, Select the top waterproof fabric, lay the top waterproof fabric on the outside of the middle waterproof covering layer, and make the first end and the second end of the top waterproof fabric, which are arranged opposite each other along the length direction, pass over the first end and the second end of the steel plate bundle respectively, and then wrap them back to the outside of the middle waterproof covering layer corresponding to the lower surface of the steel plate bundle, forming the first reverse wrapping end and the second reverse wrapping end. S3, multiple rectangular timbers are arranged on the lower side of the steel plate bundle wrapped with the inner anti-rust sealing layer and the middle waterproof coating layer, so that the rectangular timbers arranged near the first end press the first reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle, and the rectangular timbers arranged near the second end press the second reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle; S4, the wrapped steel plate bundle, the top waterproof cloth and the rectangular wood are tied and fixed by the strapping. Buffer protection parts are set at the positions corresponding to the edges of the steel plate bundle and the strapping. The tape used in the packaging process does not directly stick to the surface of the steel plate.

[0007] Preferably, sealing the overlap and end cap of the rust-proof paper in step S1 includes the following steps: The portions of the rust-proof paper located on both sides of the steel plate bundle are folded upwards to the upper surface of the steel plate bundle, so that the two sides of the rust-proof paper overlap on the upper surface to form an overlap seam extending along the length direction; The lap joint was fully covered and sealed with masking tape. The portion of the rust-proof paper extending beyond the first and second ends is folded and covered over the corresponding end faces of the steel plate bundle, and overlapped with the rust-proof paper already sealed on the upper surface to form an end sealing seam. The end seams are fully covered and sealed with paper tape, so that all the splicing gaps and port joints of the rust-proof paper are sealed.

[0008] Preferably, step S2 includes the following steps: The top waterproof fabric is laid in the center on the outside of the middle waterproof covering layer, so that the center line of the length direction of the top waterproof fabric coincides with the center line of the length direction of the steel plate bundle. After the first end of the top waterproof cloth passes over the first end of the steel plate bundle, it is pulled taut towards the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the first wrapped end. After the second end of the top waterproof fabric passes over the second end of the steel plate bundle, it is pulled taut toward the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the second wrapped end.

[0009] Preferably, setting multiple rectangular timbers in step S3 includes: making the outer edge of the first rectangular timber 400mm away from the first or second end of the steel plate bundle; setting the center-to-center distance between two adjacent rectangular timbers to 1.1m; and when the remaining distance between the rectangular timber furthest from the first end and the second end of the steel plate bundle is greater than 400mm, adding a rectangular timber at the position corresponding to the remaining distance.

[0010] Preferably, the step S4 of setting the buffer protection includes the following steps: placing the buffer protection between the strapping and the upper surface edge of the wrapped steel plate bundle, and between the strapping and the lower surface edge of the wrapped steel plate bundle, and ensuring that the buffer protection is fully fitted to the corresponding edge, so that after the strapping is tightened, the buffer protection provides flexible cushioning to the edge, preventing the strapping from directly pressing and abrading the edges of the steel plate bundle.

[0011] Preferably, in step S1, the selection of rust-proof paper and first waterproof cloth of corresponding size according to the width of the bundle of steel plates to be packaged is based on the following matching relationship: When the width of the steel plate bundle is 1850-2000mm or 1800-1850mm, select rust-proof paper with a width of 2400mm and a first waterproof cloth with a width of 2400mm. When the width of the steel plate bundle is 900-1300mm, select rust-proof paper with a width of 1900mm and a first waterproof cloth with a width of 1500mm; When the width of the steel plate bundle is 1600-1800mm, select rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2200mm; When the width of the steel plate bundle is 1500-1600mm, select rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2000mm; When the width of the steel plate bundle is 1400-1500mm, select rust-proof paper with a width of 1900mm and a first waterproof cloth with a width of 1800mm.

[0012] Preferably, the length of the rectangular timber in step S3 is selected based on the width of the steel plate bundle, specifically according to the following matching relationship: When the width of the steel plate bundle is 1800-2000mm (excluding 2000mm), select a rectangular timber with a length of 1800mm. When the width of the steel plate bundle is 1500-1800mm (excluding 1800mm), select a rectangular timber with a length of 1500mm. When the width of the steel plate bundle is 1250-1500mm (excluding 1500mm), select a rectangular timber with a length of 1250mm. When the width of the steel plate bundle is less than or equal to 1200mm, select a rectangular timber with a length of 1000mm; When the width of the steel plate bundle is greater than 2000mm, select a rectangular timber with a length of 2000mm.

[0013] Preferably, the portion of the top waterproof cloth extending beyond both the first and second ends of the steel plate bundle is not less than 400mm; the total length of the rust-proof paper in step S1 is 500-1000mm longer than the length of the steel plate bundle, and the total length of the first waterproof cloth is 500-900mm longer than the length of the steel plate bundle.

[0014] Preferably, the rust-proof paper is a vapor-phase composite rust-proof paper, and both the first waterproof cloth and the top waterproof cloth are knife-coated cloth.

[0015] Preferably, when bonding and fixing the middle waterproof covering layer, tape matching the color of the first waterproof fabric is used for bonding; when bonding and fixing the top waterproof fabric, tape matching the color of the top waterproof fabric is used for bonding.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. This invention establishes a precise matching system between the width of the steel plate and the anti-rust paper, the first waterproof cloth, and the rectangular wood, realizing customized packaging adaptation for bundling steel plates of different specifications. It completely solves the problems of chaotic size adaptation, blind spots in protection, and material waste of traditional packaging materials, and greatly improves the adaptability and economy of packaging.

[0017] 2. This invention adopts a three-layer step-by-step wrapping structure of "inner layer anti-rust sealing + middle layer waterproof covering + top layer waterproof cloth reverse wrapping and pressing", combined with an all-round tape sealing process. Compared with traditional single-layer packaging, the sealing, waterproof and anti-rust performance is greatly improved, which can effectively isolate the intrusion of air, water vapor and dust, and prevent oxidation and corrosion of steel plates during storage and transportation from the root.

[0018] 3. This invention reverses the two ends of the top waterproof cloth to the lower outer side of the steel plate bundle to form reversed ends. The reversed ends are pressed between the rectangular wood placed near the two ends of the steel plate bundle and the lower outer surface of the bundle. This mechanically locks the ends of the top waterproof cloth to prevent them from warping or shrinking under transportation vibration. It also eliminates hidden water seepage channels in the end area of ​​the steel plate bundle and significantly improves the end sealing reliability of the packaging structure during long-distance transportation and long-term storage.

[0019] 4. This invention provides a buffer protection component at the position corresponding to the edge of the steel plate bundle, thereby isolating the direct hard contact between the bundle and the packaging layer and the edge of the steel plate bundle. The buffer protection component absorbs and disperses the concentrated pressure when the bundle is tightened, preventing the bundle from directly pressing and cutting the outer waterproof material, preventing the formation of new water ingress points at the point where the bundle is tightened, and protecting the edges and corners of the steel plate bundle from wear.

[0020] 5. This invention provides a buffer protection component at the position corresponding to the edge of the steel plate bundled with the strapping strap, and limits the tape used in the packaging process from directly adhering to the surface of the steel plate. This buffer protection component provides a visual reference boundary for tape adhesion, constrains the adhesion range of the tape, and prevents the tape from adhering to the steel plate surface beyond the boundary, causing adhesive residue. It also prevents the tape from entering the high-friction area of ​​the strapping strap and being peeled off during transportation vibration, thus balancing the neatness of the packaging appearance and the reliability of the tape adhesion.

[0021] 6. All processes, dimensional parameters, and operating standards of this invention are standardized and quantitatively controlled. The operation process is clear and highly replicable, adaptable to various packaging conditions, including manual and automatic processes. It is suitable for industrial-scale mass application and effectively improves the standardization of steel plate packaging and the product qualification rate. Attached Figure Description

[0022] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on the structures shown in these drawings without creative effort.

[0023] Figure 1 This is a schematic flowchart of one embodiment of the present invention; Figure 2 This is a schematic diagram of a steel plate anti-rust packaging according to one embodiment of the present invention.

[0024] The objectives, features, and advantages of this invention will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0025] It should be understood that the specific embodiments described herein are merely illustrative of the invention and are not intended to limit the invention.

[0026] 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 a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments obtained by those skilled in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.

[0027] Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this invention.

[0028] Please refer to Figures 1 to 2 The present invention provides a method for rust-proof packaging of steel plates, comprising the following steps: S1. Based on the width of the steel plate bundle to be packaged, select rust-proof paper and a first waterproof cloth of corresponding size. First, wrap the steel plate bundle with the rust-proof paper and seal the overlap and end seal of the rust-proof paper to form an inner rust-proof sealing layer. Then, wrap it with the first waterproof cloth to form a middle waterproof covering layer. The steel plate bundle has a length direction and a first end and a second end that are arranged opposite to each other along the length direction. Before starting the packaging operation, confirm the steel plate bundling plan, retrieve the steel plate bundles to be packaged from the corresponding storage location, and verify the core parameters such as bundle specifications, steel type, bundle number, and number of bundles to ensure that the retrieved steel plate bundles are consistent with the packaging plan. After verification, select the corresponding size of rust-proof paper, first waterproof tarpaulin, and rectangular timber according to the preset matching standards based on the actual measured width of the steel plates. At the same time, prepare a complete set of packaging consumables and equipment, including paper tape, tape matching the color of the first waterproof tarpaulin, cushioning protective parts, bundling straps, marker pens, and packing equipment.

[0029] After all materials are prepared, first lay the first waterproof tarpaulin flat on the packing table surface. Adjust the position of the first waterproof tarpaulin along its length so that its center line completely coincides with the center line of the packing table. Ensure the total length of the first waterproof tarpaulin is 500-900mm longer than the length of the steel plate bundle, allowing sufficient leeway for subsequent side folding and end folding and securing. Next, lay rust-proof paper in the center of the first waterproof tarpaulin surface. Adjust the position of the rust-proof paper along its length so that its center line coincides with the center line of the first waterproof tarpaulin. Ensure the total length of the rust-proof paper is 500-1000mm longer than the length of the steel plate bundle, allowing sufficient leeway for subsequent side folding and end folding and sealing. After the rust-proof paper is laid flat and centered, place the steel plate bundle on top of the rust-proof paper, ensuring the center line of the steel plate bundle coincides with the center line of the rust-proof paper.

[0030] After the rust-proof paper is wrapped and sealed, a middle waterproof covering layer is formed on the outside of the inner rust-proof sealing layer. Specifically, the portions of the first waterproof cloth on both sides of the steel plate bundle are folded upwards to cover the sides of the steel plate bundle already wrapped with the inner rust-proof sealing layer, so that the two sides of the first waterproof cloth overlap the upper surface of the steel plate bundle, and are then bonded and fixed to the upper surface of the steel plate bundle with tape. The portion of the first waterproof cloth extending beyond the first end of the steel plate bundle is folded over to cover the first end face and fixed with tape. The portion of the first waterproof cloth extending beyond the second end of the steel plate bundle is folded over to cover the second end face and fixed with tape. In this way, the outer layer of the inner rust-proof sealing layer is covered by the middle waterproof covering layer formed by the first waterproof cloth, forming a double-layer protective structure of inner rust prevention and middle waterproofing.

[0031] S2, Select the top waterproof fabric, lay the top waterproof fabric on the outside of the middle waterproof covering layer, and make the first end and the second end of the top waterproof fabric, which are arranged opposite each other along the length direction, pass over the first end and the second end of the steel plate bundle respectively, and then wrap them back to the outside of the middle waterproof covering layer corresponding to the lower surface of the steel plate bundle, forming the first reverse wrapping end and the second reverse wrapping end. After the two ends are reversed, the excess parts of the top waterproof cloth on both sides of the steel plate bundle are pulled tight and smoothed so that it fits the outer surface of the corresponding middle waterproof covering layer on both sides of the steel plate bundle without wrinkles or looseness. The two sides of the top waterproof cloth are then firmly glued with tape, so that the top waterproof cloth forms an overall outer waterproof cover around the steel plate bundle.

[0032] S3, multiple rectangular timbers are arranged on the lower side of the steel plate bundle wrapped with the inner anti-rust sealing layer and the middle waterproof coating layer, so that the rectangular timbers arranged near the first end press the first reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle, and the rectangular timbers arranged near the second end press the second reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle; Before packaging, high-definition photos are taken of the steel plate bundles to record the specifications, steel type, bundle number, and number of bundles, preserving the image traceability data. At the same time, the above bundling information is clearly recorded item by item in a dedicated packing logbook, with neat handwriting and accurate data, ensuring that the image record corresponds one-to-one with the written record, without errors or omissions.

[0033] After all packaging layers are wrapped and secured with strapping, the bundle number, steel type, specifications, and number of sheets are clearly written on both ends of the wrapped steel plate bundle using a marker. Before writing, the packing record book and archived photos are strictly checked to ensure complete consistency between the written information, the actual bundle, the written record, and the visual data, and that the markings are clear, standardized, and without alterations. This end-face marking, in conjunction with the aforementioned bundle information retention step, constitutes a complete bundle information traceability system, facilitating rapid identification and traceability of bundles during warehousing, transportation, and delivery.

[0034] S4, the wrapped steel plate bundle, the top waterproof cloth and the rectangular wood are tied and fixed by the strapping. Buffer protection parts are set at the positions corresponding to the edges of the steel plate bundle and the strapping. The tape used in the packaging process does not directly stick to the surface of the steel plate.

[0035] Furthermore, this invention employs a contactless bonding standard throughout the entire packaging process: all tapes are not directly bonded to the surface of the steel plate. When bonding and fixing the outermost layer, the application area of ​​the outermost tape is based on the cushioning protective element, and does not exceed the location of the cushioning protective element. This prevents the tape from extending beyond the boundary and sticking to the surface of the steel plate, causing adhesive residue, and also prevents the tape from entering the high-friction area of ​​the strapping and being peeled off during transportation vibration. After all packaging processes are completed, the sealing effect, fixing status, and labeling information are thoroughly inspected to confirm that there are no quality problems, thus completing the rust-proof packaging operation.

[0036] In a preferred embodiment, sealing the overlap and end cap of the rust-proof paper in step S1 includes the following steps: The portions of the rust-proof paper located on both sides of the steel plate bundle are folded upwards to the upper surface of the steel plate bundle, so that the two sides of the rust-proof paper overlap on the upper surface to form an overlap seam extending along the length direction; First, place the steel plate bundle on the rust-proof paper that has been laid flat on the packing table, ensuring that the center line of the steel plate bundle along its length coincides with the center line of the rust-proof paper along its length. Since the total length of the rust-proof paper is greater than the length of the steel plate bundle, allowance is provided on the outer sides of both the first and second ends of the steel plate bundle for folding and sealing. It should be noted that the rust-proof paper has been laid flat and centered before being placed into the steel plate bundle. The specific method of laying and centering described above does not constitute a limitation of this invention; those skilled in the art can choose an appropriate paper-laying method based on the site conditions.

[0037] Next, fold the portions of the rust-proof paper on both sides of the steel plate bundle upwards to the top surface of the bundle. The two sides of the rust-proof paper meet and overlap on the top surface, forming an overlap seam extending along the length. Since the width of the rust-proof paper is selected based on the width of the steel plate bundle, and the width of the rust-proof paper is greater than the width of the steel plate bundle, the two sides of the rust-proof paper can fully overlap on the top surface of the steel plate bundle, preventing the overlap seam from loosening or forming gaps due to excessively narrow overlap under stress. After the overlap seam is formed, use masking tape to fully cover and seal the overlap seam. The masking tape is continuously applied along the length, completely sealing the overlap seam between the two sides of the rust-proof paper, blocking the path for external air and moisture to enter the interior of the steel plate bundle through this overlap seam.

[0038] The lap joint was fully covered and sealed with masking tape. The portion of the rust-proof paper extending beyond the first and second ends is folded and covered over the corresponding end faces of the steel plate bundle, and overlapped with the rust-proof paper already sealed on the upper surface to form an end sealing seam. Fold the portion of the rust-proof paper extending beyond the first end of the steel plate bundle towards the first end face, ensuring this portion adheres to the first end face and overlaps with the already sealed rust-proof paper on the upper surface, forming the end seal at the first end. Fold the portion of the rust-proof paper extending beyond the second end of the steel plate bundle towards the second end face, ensuring this portion adheres to the second end face and overlaps with the already sealed rust-proof paper on the upper surface, forming the end seal at the second end. After both ends are folded, use masking tape to fully cover and seal the end seals at both ends, continuously applying the tape along the extension direction of the end seals to completely seal the gap between the folded portion and the upper surface rust-proof paper.

[0039] The end seams are fully covered and sealed with paper tape, so that all the splicing gaps and port joints of the rust-proof paper are sealed.

[0040] After the above operations are completed, the rust-proof paper forms an overlapping seam extending along the length of the steel plate bundle and sealed with paper tape on the upper surface. End sealing seams, also sealed with paper tape, are formed at the first and second ends, thus sealing all the seams and joints of the rust-proof paper. At this point, the rust-proof paper forms a fully enclosed inner rust-proof sealing layer on the outside of the steel plate bundle, effectively isolating it from direct contact with external air and moisture, and fundamentally inhibiting corrosion of the steel plate during storage and transportation due to oxidation and moisture intrusion.

[0041] In a preferred embodiment, step S2 includes the following steps: The top waterproof fabric is laid in the center on the outside of the middle waterproof covering layer, so that the center line of the length direction of the top waterproof fabric coincides with the center line of the length direction of the steel plate bundle. The top waterproof fabric is laid centered on the outer side of the corresponding upper surface of the steel plate bundle in the middle waterproof covering layer. By adjusting the position of the top waterproof fabric along its length, the center line of the top waterproof fabric along its length coincides with the center line of the steel plate bundle along its length. The total length of the top waterproof fabric is greater than the length of the wrapped steel plate bundle. Therefore, the top waterproof fabric forms a first end and a second end that extend beyond the end face on the outer side of both the first and second ends of the steel plate bundle.

[0042] After the first end of the top waterproof cloth passes over the first end of the steel plate bundle, it is pulled taut towards the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the first wrapped end. Pull the first end of the top waterproof fabric downwards along the first end face of the steel plate bundle and smooth it out, so that the first end fits against the outer surface of the corresponding middle waterproof covering layer. Continue to bend the first end towards the lower surface of the steel plate bundle and wrap it up again until the end of the first end extends to the outer side of the lower surface of the corresponding middle waterproof covering layer of the steel plate bundle, forming the first wrapped end. During this wrapping process, the tightening operation eliminates any wrinkles and looseness that may occur in the bending area of ​​the top waterproof fabric, ensuring that the top waterproof fabric fits tightly against the middle waterproof covering layer at the bend, avoiding water accumulation pits or loose gaps caused by wrinkles.

[0043] After the second end of the top waterproof fabric passes over the second end of the steel plate bundle, it is pulled taut toward the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the second wrapped end.

[0044] In the same manner, pull the second end of the top waterproof cloth downwards along the second end face of the steel plate bundle and smooth it out so that the second end is attached to the outer surface of the middle waterproof covering layer corresponding to the second end face. Continue to bend the second end towards the lower surface of the steel plate bundle and wrap it up until the end of the second end extends to the outer side of the lower surface of the middle waterproof covering layer corresponding to the steel plate bundle, forming the second reversed end.

[0045] After both ends are reverse-wrapped, the top waterproof cloth forms a continuous, wrinkle-free wrapping path at the first and second ends respectively: the outer side of the upper surface, the outer side of the end face, and the outer side of the lower side. This makes the top waterproof cloth form a continuous, integral waterproof covering layer in both directions of the steel plate bundle. Combined with the mechanical pressing of the long rectangular wood on the first and second reverse-wrapped ends in the subsequent steps, reliable sealing and anti-warping of the end areas are achieved.

[0046] When wrapping the top waterproof cloth, the excess parts of the top waterproof cloth on both sides of the steel plate bundle are pulled tight and smoothed so that they fit the outer surface of the corresponding middle waterproof covering layer on both sides of the steel plate bundle without wrinkles or looseness. The two sides of the top waterproof cloth are then firmly glued with tape, so that the top waterproof cloth forms an overall outer waterproof cover around the steel plate bundle.

[0047] As a preferred example, setting multiple rectangular timbers in step S3 includes: making the outer edge of the first rectangular timber 400mm away from the first or second end of the steel plate bundle; setting the center-to-center distance between two adjacent rectangular timbers to 1.1m; and when the remaining distance between the rectangular timber furthest from the first end and the second end of the steel plate bundle is greater than 400mm, adding a rectangular timber at the position corresponding to the remaining distance.

[0048] First, determine the placement of the first rectangular timber on the underside of the steel plate bundle, which is wrapped with an inner anti-rust sealing layer and a middle waterproof covering layer: the first rectangular timber is placed close to the first end of the steel plate bundle, with a distance of 400mm between its outer edge and the first end. This 400mm distance matches the reserved length of the reversed end formed after the first end of the top waterproof fabric is wrapped around the lower outer side, ensuring that the first reversed end is completely covered and pressed firmly by the first rectangular timber. After pressing, the first reversed end is clamped between the first rectangular timber and the lower outer surface of the wrapped steel plate bundle, forming a mechanical lock. Even if the steel plate bundle experiences vibration or impact during transportation, the first reversed end will not warp, retract, or loosen due to force.

[0049] Then, along the length of the steel plate bundle, starting from the first rectangular timber and moving towards the second end, the remaining rectangular timbers are laid sequentially, ensuring a center-to-center distance of 1.1m between adjacent rectangular timbers. This standardized spacing between adjacent rectangular timbers ensures, on the one hand, that the steel plate bundle is subjected to uniform force along its length, preventing bending deformation or packaging layer dents caused by excessively large spacing; on the other hand, it provides a regular path for the strapping, and the strapping positions corresponding to the spacing between adjacent rectangular timbers guarantee a uniform distribution of binding force.

[0050] When laying the material near the second end, measure the remaining gap between the rectangular timber closest to the second end and the second end itself. If this remaining gap is greater than 400mm, add another rectangular timber at the corresponding position. This added rectangular timber effectively eliminates the excessively long unsupported area at the tail, preventing the tail of the steel plate bundle from bending downwards due to lack of support during hoisting or forklift handling. It also prevents the second reverse wrapping end of the top waterproof fabric from warping and creating water ingress channels in the tail area due to loss of compression protection.

[0051] After all the rectangular timbers are laid, each rectangular timber can be tightened with the steel plate bundles and packaging layers by the strapping operation to form a stable support and compression structure.

[0052] As a preferred example, the step S4 of setting the buffer protection includes the following steps: placing the buffer protection between the strapping and the upper surface edge of the wrapped steel plate bundle, and between the strapping and the lower surface edge of the wrapped steel plate bundle, and ensuring that the buffer protection is fully fitted to the corresponding edge, so that after the strapping is tightened, the buffer protection provides flexible cushioning to the edge, preventing the strapping from directly pressing and abrading the edges of the steel plate bundle.

[0053] After passing the strapping through the slot in the rectangular timber, first determine the path of the strapping on the upper and lower surfaces of the wrapped steel plate bundle. Along this path, place cushioning inserts at the intersection of the strapping and the upper edge of the wrapped steel plate bundle, with one side of the cushioning insert against the upper edge of the bundle and the other side facing the strapping. Similarly, place cushioning inserts at the intersection of the strapping and the lower edge of the bundle, covering both the corresponding upper and lower edges. After placement, ensure the cushioning inserts are completely flush with the corresponding edges, leaving no gaps.

[0054] In the above arrangement, the cushioning guard is located between the strapping and the edge of the wrapped steel plate bundle, isolating them from direct contact. Thus, when the strapping is subsequently tightened by a manual strapping machine, the tightening force of the strapping first acts on the outer surface of the cushioning guard, which then distributes the tightening force to the edge area of ​​the wrapped steel plate bundle, rather than the strapping directly pressing against the edge.

[0055] Through the above-mentioned design, the cushioning component provides flexible cushioning to the edges of the wrapped steel plate bundle after the strapping is tightened. On the one hand, the elastic deformation of the cushioning component absorbs the concentrated stress component in the tightening force of the strapping, preventing the strapping from directly cutting and pressing the edges of the wrapped steel plate bundle in a line contact manner. This prevents the edges of the steel plate bundle from undergoing plastic deformation or edge wear due to the high pressure and strong compression of the strapping, while also protecting the existing packaging layer in this area from being torn by the strapping and avoiding the formation of new water seepage channels at the point where the strapping is tightened. On the other hand, the cushioning component increases the frictional contact area between the strapping and the edges of the wrapped steel plate bundle, which helps to suppress the lateral slippage of the strapping along the edge direction during transportation vibration and reduces repeated frictional damage to the packaging layer caused by strapping deviation.

[0056] Preferably, the cushioning element is a black rubber strip, the width of which is sufficient to cover the contact area between the strapping and the edge of the wrapped steel plate. Using a black rubber strip as the cushioning element not only achieves the aforementioned flexible cushioning and anti-slip effects, but also utilizes the visual contrast between the black rubber strip and the packaging material to provide operators with a visual reference boundary for the subsequent application of the outer tape. This, to a certain extent, constrains the application area of ​​the outer tape, reducing the risk of the tape extending beyond the boundary onto the steel plate surface or entering the high-friction area of ​​the strapping.

[0057] As a preferred example, in step S1, the selection of rust-proof paper and first waterproof cloth of corresponding sizes based on the width of the bundle of steel plates to be packaged is specifically based on the following matching relationship: When the width of the steel plate bundle is 1850-2000mm or 1800-1850mm, select rust-proof paper and a first waterproof cloth with a width of 2400mm. This width of steel plate bundle is a relatively wide product. Selecting rust-proof paper and a first waterproof cloth with a width of 2400mm allows for a covering allowance of about 200-275mm on each side of the steel plate bundle. This ensures that the rust-proof paper on both sides forms a sufficiently wide overlap area when it overlaps on the upper surface. It also ensures that the first waterproof cloth can completely cover both sides of the inner rust-proof sealing layer when it is wrapped in the middle layer, without any exposed gaps.

[0058] For example, when the width of the steel plate bundle is 900-1300mm, a 1900mm wide rust-proof paper and a 1500mm wide first waterproof cloth can be selected. For this type of medium-narrow steel plate bundle, selecting a 1900mm wide rust-proof paper allows for a covering allowance of about 300-500mm on each side, which meets the need for the rust-proof paper to fully overlap and the ends to be folded and sealed. While selecting a 1500mm wide first waterproof cloth (which is smaller than the 1900mm width of the rust-proof paper) does not result in insufficient coverage, even though the absolute width of the first waterproof cloth is smaller than that of the rust-proof paper at this level, it does not lead to insufficient coverage. This is because the rust-proof paper has completely covered and sealed the steel plate bundle. The function of the first waterproof cloth is to provide a middle waterproof covering layer outside the rust-proof paper. Its width only needs to cover the width range of the already covered steel plate bundle, without the need to provide additional folding allowance. Using a slightly narrower first waterproof tarpaulin reduces material costs and also minimizes excess tarpaulin from piling up and wrinkling on the sides of the bundle during the middle layer wrapping, resulting in a more regular bundle shape.

[0059] When the width of the steel plate bundle is 1600-1800mm, a rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2200mm are selected. When the width of the steel plate bundle increases to 1600-1800mm, the width of the first waterproof cloth is selected to be 2200mm, slightly larger than the 2100mm of the rust-proof paper. With the increased width of the steel plate bundle, the cumulative increase in the overall thickness of the bundle already covered with the inner rust-proof sealing layer increases the actual outer perimeter length that the first waterproof cloth needs to cover during the middle layer wrapping. If the width of the first waterproof cloth is insufficient, it may result in insufficient overlap and coverage on both sides of the first waterproof cloth during the middle layer wrapping, creating a weak area in the middle waterproof covering layer.

[0060] When the width of the steel plate bundle is 1500-1600mm, select rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2000mm. The rust-proof paper width of 2100mm leaves about 250-300mm of covering allowance on each side. The first waterproof cloth width of 2000mm is sufficient to cover the outer layer while avoiding wrinkles caused by excessive material.

[0061] When the width of the steel plate bundle is 1400-1500mm, select rust-proof paper with a width of 1900mm and a first waterproof tarpaulin with a width of 1800mm. The 1900mm width of the rust-proof paper should have a margin of approximately 200-250mm on each side to ensure sufficient overlap, and the 1800mm width of the first waterproof tarpaulin should effectively cover the width of the already wrapped bundle.

[0062] It should be noted that the selected widths of the aforementioned rust-proof paper and first waterproof fabric are based on the assumption that the steel plate bundles have a conventional preset height (e.g., a thin plate bundle not exceeding 100mm). In actual industrial applications, when the actual stack height of the steel plate bundles exceeds this preset height, the selected widths of the rust-proof paper and first waterproof fabric need to be based on the above matching standards, plus a side covering allowance corresponding to the actual height of the steel plate bundle (usually more than twice the actual height), to ensure that the sides of the rust-proof paper and first waterproof fabric can completely cover the sides of the bundle and extend to the upper surface for effective overlap. Through this dynamic matching of basic dimensions plus height compensation, the fully sealed effect of the middle waterproof covering layer is ensured.

[0063] This embodiment covers the full range of common industrial steel plates, from narrow to wide, ensuring that each size of steel plate bundle can be precisely matched with the corresponding packaging material. This avoids waste caused by excessively large material sizes or blind spots caused by excessively small sizes, which are common in traditional processes. Furthermore, the differentiated width settings of the rust-proof paper and the first waterproof tarpaulin at different levels reflect the different emphases on rust prevention and sealing requirements and waterproofing requirements for steel plate bundles of different widths. This ensures that the use of packaging materials simultaneously considers protective integrity, packaging neatness, and material economy.

[0064] As a preferred example, the length of the rectangular timber in step S3 is selected based on the width of the steel plate bundle, specifically according to the following matching relationship: When the width of the steel plate bundle is 1800-2000mm (excluding 2000mm), select a rectangular timber with a length of 1800mm. Since the steel plate bundle is a relatively wide specification, the 1800mm length of the rectangular timber is basically the same as or slightly smaller than the width of the steel plate bundle. This can form a support and coverage surface that is close to the full width of the steel plate bundle, so that the lower support width of the steel plate bundle at various positions in the length direction matches the overall width of the steel plate bundle, and avoid the edge being suspended due to the rectangular timber being too short.

[0065] When the width of the steel plate bundle is 1500-1800mm (excluding 1800mm), select a rectangular timber with a length of 1500mm. The length of the rectangular timber should be aligned with the lower limit of the width range. This ensures sufficient support width for the lower side of the steel plate bundle while avoiding excessive overhang caused by the length of the rectangular timber exceeding the width of the steel plate bundle. This also reduces collision damage to the ends of the rectangular timber or unnecessary space occupation.

[0066] When the width of the steel plate bundle is 1250-1500mm (excluding 1500mm), a rectangular timber with a length of 1250mm should be selected. As the width of the steel plate bundle decreases, the length of the rectangular timber should decrease accordingly to maintain a suitable fit between the rectangular timber and the width of the steel plate bundle. If the length of the rectangular timber is too large, its end will protrude too far beyond the outer side of the steel plate bundle, which may easily interfere with other bundles or transportation equipment during transportation and stacking, increasing the risk of collision and displacement. If the length of the rectangular timber is too small, the steel plate bundle will not receive effective support in the width direction, and when the bundle straps are tightened, it may cause the lower packaging layer of the steel plate bundle edge area to dent and uneven stress.

[0067] When the width of the steel plate bundle is less than or equal to 1200mm, a rectangular timber with a length of 1000mm is selected; the 1000mm length of the rectangular timber provides stable bottom support. It should be noted that, in this case, the length of the rectangular timber is less than the width of the steel plate bundle, but after the bundling straps are tightened, the circumferential constraint of the bundling straps presses the rectangular timber against the underside of the steel plate bundle. The tightening force applied by the bundling straps on both sides of the width of the steel plate bundle can balance the force on the outer edges of the steel plate bundle at both ends of the rectangular timber, preventing edge sagging or loosening of the packaging layer.

[0068] When the width of the steel plate bundle exceeds 2000mm, select rectangular timber with a length of 2000mm. Using 2000mm for the rectangular timber ensures support strength while also considering the economic efficiency of purchasing and processing rectangular timber as a standard consumable: 2000mm is a common standard length in the industrial timber and board market, eliminating the need for custom cutting, which helps reduce material procurement costs and inventory management complexity.

[0069] As a preferred example, the portion of the top waterproof cloth extending beyond both the first and second ends of the steel plate bundle is not less than 400mm; the total length of the rust-proof paper in step S1 is 500-1000mm longer than the length of the steel plate bundle, and the total length of the first waterproof cloth is 500-900mm longer than the length of the steel plate bundle.

[0070] It should be noted that for steel plate bundles with a thickness exceeding the conventional preset height, the length of the top waterproof cloth extending beyond the first and second ends of the steel plate bundle should be 400mm, plus an extension allowance corresponding to the actual height of the steel plate bundle. This ensures that after the top waterproof cloth is wrapped around the lower outer side, it still forms an effective length of wrapped end for the rectangular timber to be pressed down.

[0071] Preferably, the rust-proof paper is a vapor-phase composite rust-proof paper, and both the first waterproof cloth and the top waterproof cloth are knife-coated cloth. Vapor-phase composite rust-proof paper is a sheet-like rust-proof packaging material made by coating neutral kraft paper as the base material with a composite coating containing volatile corrosion inhibitors. When the vapor-phase composite rust-proof paper wraps and bundles steel plates to form a sealed inner rust-proof sealing layer, the corrosion inhibitor slowly evaporates from the coating, creating a rust-proof protective vapor environment within the limited space inside the sealing layer. The evaporated corrosion inhibitor molecules adsorb onto the steel plate surface, forming a molecular-level protective film, thereby inhibiting the electrochemical corrosion reaction on the steel plate surface caused by the presence of oxygen and moisture. Compared with traditional rust-proof oil coating or simple plastic film wrapping, vapor-phase composite rust-proof paper can exert its rust-proof effect without direct contact with the steel plate surface, and the rust-proof components can penetrate into the gaps between the layers of the steel plate bundle, providing a certain degree of protection to each layer of steel plate inside the bundle.

[0072] Knife-coated fabric is a flexible waterproof covering material made by coating a waterproof coating such as polyvinyl chloride or polyurethane onto the surface of high-strength polyester fiber using a knife-coating process. It possesses excellent tensile strength, tear resistance, weather resistance, and waterproof performance. In this invention, when the first waterproof fabric is used as the middle waterproof covering layer, its high tensile strength provides structural support for the inner rust-proof sealing layer during the tightening of the strapping and transportation vibrations, preventing the inner rust-proof sealing layer from being stretched and cracked in the stressed areas. When the top waterproof fabric is knife-coated fabric, its weather resistance and tear resistance ensure that the outermost waterproof covering layer remains intact for extended periods under harsh external conditions such as long-distance transportation, open-air storage, and exposure to wind and sun, without losing its waterproof function due to aging, brittleness, or external tearing. Simultaneously, its flexibility makes end-bending and reverse-wrapping operations easy to implement, reducing the likelihood of stress cracking at the bending points.

[0073] Preferably, when bonding and fixing the middle waterproof covering layer, tape matching the color of the first waterproof fabric is used; when bonding and fixing the top waterproof fabric, tape matching the color of the top waterproof fabric is used. This makes the tape visually blend with the corresponding waterproof fabric, improving the overall neatness and aesthetics of the bundle. Furthermore, the different colored tape layers facilitate quick differentiation and identification of the bonding status of different covering layers during quality inspection: when a layer of tape is detached, peeling, or missing, operators can quickly locate the corresponding waterproof fabric covering layer based on the color, improving the efficiency of quality inspection and re-bonding, and avoiding missed inspections due to the inability to distinguish the tape's origin.

[0074] The above are merely preferred embodiments of the present invention and are not intended to limit the scope of protection of the present invention. Any equivalent structural or procedural transformations made based on the description and drawings of the present invention, or direct or indirect applications in other related technical fields, are similarly included within the scope of patent protection of the present invention.

Claims

1. A method for rust-proof packaging of steel plates, characterized in that, Includes the following steps: S1. Based on the width of the steel plate bundle to be packaged, select rust-proof paper and a first waterproof cloth of corresponding size. First, wrap the steel plate bundle with the rust-proof paper and seal the overlap and end seal of the rust-proof paper to form an inner rust-proof sealing layer. Then, wrap it with the first waterproof cloth to form a middle waterproof covering layer. The steel plate bundle has a length direction and a first end and a second end that are arranged opposite to each other along the length direction. S2, Select the top waterproof fabric, lay the top waterproof fabric on the outside of the middle waterproof covering layer, and make the first end and the second end of the top waterproof fabric, which are arranged opposite each other along the length direction, pass over the first end and the second end of the steel plate bundle respectively, and then wrap them back to the outside of the middle waterproof covering layer corresponding to the lower surface of the steel plate bundle, forming the first reverse wrapping end and the second reverse wrapping end. S3, multiple rectangular timbers are arranged on the lower side of the steel plate bundle wrapped with the inner anti-rust sealing layer and the middle waterproof coating layer, so that the rectangular timbers arranged near the first end press the first reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle, and the rectangular timbers arranged near the second end press the second reverse end between the rectangular timbers and the lower outer surface of the wrapped steel plate bundle; S4, the wrapped steel plate bundle, the top waterproof cloth and the rectangular wood are tied and fixed by the strapping. Buffer protection parts are set at the positions corresponding to the edges of the steel plate bundle and the strapping. The tape used in the packaging process does not directly stick to the surface of the steel plate.

2. The method for rust-proof packaging of steel plates according to claim 1, characterized in that, The sealing of the overlap and end sealing of the rust-proof paper in step S1 includes the following steps: The portions of the rust-proof paper located on both sides of the steel plate bundle are folded upwards to the upper surface of the steel plate bundle, so that the two sides of the rust-proof paper overlap on the upper surface to form an overlap seam extending along the length direction; The lap joint was fully covered and sealed with masking tape. The portion of the rust-proof paper extending beyond the first and second ends is folded and covered over the corresponding end faces of the steel plate bundle, and overlapped with the rust-proof paper already sealed on the upper surface to form an end sealing seam. The end seams are fully covered and sealed with paper tape, so that all the splicing gaps and port joints of the rust-proof paper are sealed.

3. The method for rust-proof packaging of steel plates according to claim 2, characterized in that, Step S2 includes the following steps: The top waterproof fabric is laid in the center on the outside of the middle waterproof covering layer, so that the center line of the length direction of the top waterproof fabric coincides with the center line of the length direction of the steel plate bundle. After the first end of the top waterproof cloth passes over the first end of the steel plate bundle, it is pulled taut towards the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the first wrapped end. After the second end of the top waterproof fabric passes over the second end of the steel plate bundle, it is pulled taut toward the lower surface of the steel plate bundle and wrapped around the middle waterproof covering layer to the outside of the lower surface of the steel plate bundle, forming the second wrapped end.

4. The rust-proof packaging method for steel plates according to claim 3, characterized in that, Step S3 involves setting multiple rectangular timbers, including: making the outer edge of the first rectangular timber 400mm away from the first or second end of the steel plate bundle; setting the center-to-center distance between two adjacent rectangular timbers to 1.1m; and when the remaining distance between the rectangular timber furthest from the first end and the second end of the steel plate bundle is greater than 400mm, adding a rectangular timber at the position corresponding to the remaining distance.

5. The method for rust-proof packaging of steel plates according to claim 4, characterized in that, The step S4 of setting the buffer protection includes the following steps: placing the buffer protection between the strapping and the upper surface edge of the wrapped steel plate bundle, and between the strapping and the lower surface edge of the wrapped steel plate bundle, and ensuring that the buffer protection is fully fitted to the corresponding edge, so that after the strapping is tightened, the buffer protection provides flexible cushioning to the edge, preventing the strapping from directly pressing and abrading the edges of the steel plate bundle.

6. The method for rust-proof packaging of steel plates according to claim 4, characterized in that, In step S1, the selection of rust-proof paper and first waterproof cloth of corresponding size according to the width of the bundle of steel plates to be packaged is based on the following matching relationship: When the width of the steel plate bundle is 1850-2000mm or 1800-1850mm, select rust-proof paper with a width of 2400mm and a first waterproof cloth with a width of 2400mm. When the width of the steel plate bundle is 900-1300mm, select rust-proof paper with a width of 1900mm and a first waterproof cloth with a width of 1500mm; When the width of the steel plate bundle is 1600-1800mm, select rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2200mm; When the width of the steel plate bundle is 1500-1600mm, select rust-proof paper with a width of 2100mm and a first waterproof cloth with a width of 2000mm; When the width of the steel plate bundle is 1400-1500mm, select rust-proof paper with a width of 1900mm and a first waterproof cloth with a width of 1800mm.

7. The rust-proof packaging method for steel plates according to claim 4, characterized in that, The length of the rectangular timber in step S3 is selected based on the width of the steel plate bundle, specifically according to the following matching relationship: When the width of the steel plate bundle is 1800-2000mm (excluding 2000mm), select a rectangular timber with a length of 1800mm. When the width of the steel plate bundle is 1500-1800mm (excluding 1800mm), select a rectangular timber with a length of 1500mm. When the width of the steel plate bundle is 1250-1500mm (excluding 1500mm), select a rectangular timber with a length of 1250mm. When the width of the steel plate bundle is less than or equal to 1200mm, select a rectangular timber with a length of 1000mm; When the width of the steel plate bundle is greater than 2000mm, select a rectangular timber with a length of 2000mm.

8. The method for rust-proof packaging of steel plates according to claim 2, characterized in that, The portion of the top waterproof cloth extending beyond the first and second ends of the steel plate bundle is not less than 400mm; the total length of the rust-proof paper in step S1 is 500-1000mm longer than the length of the steel plate bundle, and the total length of the first waterproof cloth is 500-900mm longer than the length of the steel plate bundle.

9. The method for rust-proof packaging of steel plates according to claim 1, characterized in that, The rust-proof paper is a vapor-phase composite rust-proof paper, and both the first waterproof cloth and the top waterproof cloth are knife-coated cloth.

10. The method for rust-proof packaging of steel plates according to claim 1, characterized in that, When bonding and fixing the middle waterproof covering layer, tape matching the color of the first waterproof fabric is used for bonding; when bonding and fixing the top waterproof fabric, tape matching the color of the top waterproof fabric is used for bonding.

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