Packaging and protecting method of precise strip steel for automobile bellows during export transportation

Abstract

This invention discloses a packaging and protection method for precision strip steel used in automotive corrugated pipes during export transportation, belonging to the field of metal material anti-corrosion packaging and logistics transportation technology. This invention optimizes the wooden frame structure design, employing multiple protective structures including woven corrugated paper, plastic sheeting, plastic protective plates, inner and outer protective rings and end plates on both sides of the steel coil, and steel strapping. It also standardizes the precise dosing of desiccant; strengthens interface sealing and internal cushioning; and changes the position of the plastic sheeting interface. This invention effectively solves the problems of rust, impact, and rollover of steel coils during long-distance sea transport, significantly reducing the rust rate and impact damage rate of steel coils, reducing quality disputes and resulting economic losses, improving brand reputation and customer satisfaction, and has significant economic benefits and promotional value.

Description

Technical Field

[0001] This invention belongs to the field of metal material anti-corrosion packaging and logistics transportation technology, and relates to a packaging protection method for precision strip steel for automotive corrugated pipes during export transportation. Background Technology

[0002] With the continuous expansion of overseas markets and the sustained growth in the quantity of exported products, higher requirements have been placed on the quality of packaging protection. The specifications for automotive corrugated pipes are 0.15~0.2mm thick, and approximately 100 tons of automotive corrugated pipes are produced monthly for overseas markets. These products are characterized by high precision and high surface quality requirements, especially in the automotive parts industry, where any surface defects can lead to production line shutdowns or product quality issues for customers.

[0003] Currently, the plastic sheeting used for steel coil packaging has its seal on one side of the coil. This design flaw results in an incomplete seal. During subsequent packaging, workers use tape to secure the waterproof plastic sheeting, only managing to pull it taut but not completely sealing it. This leads to water stains and water ingress into the delivered steel coils. There is also a risk of water vapor entering during sea transport, and given the varying climates of different regions, the steel coils lack materials to absorb water vapor. Furthermore, the poorly designed wooden frame structure causes the frames to scatter or indent the steel coils upon arrival at their destination. Summary of the Invention

[0004] This invention aims to provide a packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation. It is particularly suitable for precision strip steel products with high precision and high surface quality requirements, especially for precision strip steel for automotive corrugated pipes with a thickness of 0.15~0.2mm during export transportation.

[0005] The core of this invention is to achieve fully enclosed moisture-proof, impact-proof, and stable transportation of steel coils during long-distance sea transport through a multi-layered protective structure and optimized wooden bracket design. The steel coils of precision strip steel used for automotive corrugated pipes are thin (approximately 0.15~0.2mm), requiring a paper sleeve as an inner liner during winding. Automotive corrugated pipe material is soft and needs protection against bumps and dents during transportation. The stainless steel produced and transported by the precision strip steel company is in coil form, categorized into two types based on coil orientation: parallel to the ground or perpendicular to the ground, with a plastic protective plate wrapped around the outside. The steel coil is tightly wrapped using plastic sleeves, plastic protective plates, inner and outer protective rings, and end plates.

[0006] This invention provides a packaging and protection method for precision strip steel used in automotive bellows during export transportation, comprising the following steps: (1) The desiccant is stored in the steel coil sleeve. The specifications of the steel coil are: inner diameter of 508mm, outer diameter of 750~850mm, and width of 580-610mm. The desiccant should be fast-acting silica gel; the storage amount of desiccant should be 0.5-1 kg per ton of steel coil, placed in a paper sleeve.

[0007] (2) Wrap the steel coil completely with crepe paper and seal the joint with transparent tape; Wrap a 90mm wide piece of crepe paper around the steel coil radially. Each wrap should overlap the previous one by 10mm to ensure the steel coil is completely wrapped and to prevent moisture damage.

[0008] (3) Select the appropriate plastic bag for packaging according to the outer diameter of the steel coil: For steel coils with a width of 580-610mm, select a 1600mm wide plastic sleeve. The length of the plastic sleeve = steel coil width × 2 + steel coil wall thickness × 2 + (300~500)mm. The specific operation is as follows: lift the steel coil, insert one end of the plastic sleeve into the inner ring from one side of the steel coil, and then pull it out from the other side of the inner ring. Then, turn the plastic sleeve from the exit side to the outer ring of the steel coil around the perimeter to the insertion side. Place the seam in the middle of the outer ring of the steel coil and seal the seam with transparent tape to completely seal the inner and outer rings of the steel coil with the plastic sleeve. (4) Wrap with a plastic protective plate; use an overhead crane to lift the steel coil and attach the plastic protective plate around the outside of the steel coil. The length of the protective plate is the circumference of the steel coil + 100mm, leaving enough space for the joint. Seal with tape to prevent water from entering the joint at the bottom of the steel coil. It is clearly stipulated that the "top-over-bottom" overlapping method should be used.

[0009] The specifications of the plastic protective plate are: thickness 2.0mm, width 550~620mm, and length 3000~3500mm; the plastic protective plate is wrapped around the outer wall of the steel coil, with a length equal to the outer diameter circumference of the steel coil + 100mm and a width equal to the width of the steel coil; the plastic protective plate has good resistance to breakage and impact. (5) The inner and outer protective rings and the end plates on both sides of the steel coil; Two annular plates, each 2.0 mm thick, are used to wrap around the centerline of the wall thickness of the ring-shaped steel coil. The circumference of the plastic end plate is greater than the inner circumference and less than the outer circumference.

[0010] The inner and outer protective rings are made of cold-rolled galvanized steel sheet. The inner protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the inner end of the steel coil. One inner protective ring is set on each side of the inner ring of the steel coil. The width of the end face that contacts the steel coil wall thickness direction is 50 mm, and the width of the axial face that contacts the inner wall of the steel coil is 30 mm. The circumference of the inner protective ring is (1580~1600) mm. The outer protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the outer end of the steel coil. One outer protective ring is set on each side of the outer ring of the steel coil. The width of the end face that contacts the steel coil wall thickness direction is 30 mm, and the width of the axial face that contacts the outer wall of the steel coil is 50 mm. (6) Steel coil bundling; packing steel straps (plastic steel straps): the radial straps are packed at the 12 o'clock, 4 o'clock and 8 o'clock positions on the circumference. There are a total of 4 axial straps, namely 2 plastic steel straps are packed on the inner and outer protective rings of the steel coil, and the remaining 2 steel straps are divided into equal widths to connect the steel coil to the wooden bracket. The clips used to connect the two steel straps are placed at the 2 o'clock or 10 o'clock position on the circumference of the steel coil and are on a straight line.

[0011] This invention makes targeted optimizations to the original wooden bracket structure: by reducing the number of horizontal wooden pieces to 2 (80×40×700mm) and adjusting their spacing to 260~300mm, and reducing the number of vertical wooden pieces in the bottom leg to 1, the weight is reduced while ensuring load-bearing capacity, and the stability of the steel coil placement is greatly improved.

[0012] Specifically, the wooden bracket includes a three-layer frame structure. The bottom layer consists of two longitudinal side frames and a central support column. Two transverse side frames (middle layer) are vertically arranged on the two longitudinal side frames, and two limiting blocks are vertically arranged at both ends above the two transverse side frames. Further, the spacing between the two transverse side frames is 260mm~300mm, and the two transverse side frames are cuboid structures with dimensions of 80mm×40mm×800mm. Further, the sides of the two transverse side frames are beveled, that is, the contact points between the two transverse side frames and the steel coil are sloped.

[0013] An adjustable "backing" device is added to the sloping end of the wooden frame, with a beveled edge to protect the steel coils from indentations, accommodating products of different coil diameters. A rubber anti-slip pad layer is added to the contact surface to fundamentally prevent lateral slippage and displacement during transportation. Anti-slip plugs (i.e., limiting blocks on the top two sides) are added to both ends of the wooden frame. The plug length is 350-420mm.

[0014] The beneficial effects of this invention are: This invention provides a complete and reliable long-distance sea freight packaging solution that significantly reduces the corrosion rate and dent damage rate of steel coils, reduces quality disputes and the resulting economic losses, and enhances brand reputation and customer satisfaction. It has significant economic benefits and promotional value. Attached Figure Description

[0015] Figure 1 This is the front view of the wooden bracket; Figure 2 for Figure 1 Top view; Figure 3 for Figure 2 The left view; Figure 4 This is a three-dimensional view of the wooden bracket.

[0016] Figure 5 This is a schematic diagram of the inner protective ring. Figure 6 This is a schematic diagram of the outer sheath. In the diagram: 1 represents the two vertical borders, 2 represents the support column, 3 represents the two horizontal borders, 4 represents the limiting block, 5 represents the end face, and 6 represents the axial face. Detailed Implementation

[0017] The present invention will be further illustrated by the following embodiments, but is not limited to the following embodiments. Example 1

[0018] The steel coil weighs 1.45 tons, has a width of 600 mm, and a thickness of 0.2 mm; the paper sleeve has an inner diameter of 508 mm.

[0019] (1) The desiccant is stored in the steel coil sleeve. The desiccant is fast-acting silica gel desiccant. The storage weight of the desiccant is 1 kg.

[0020] (2) Wrap the steel coil completely with crepe paper and seal the joint with transparent tape. The specific operation is as follows: Wrap the crepe paper around the steel coil radially once. The width of the crepe paper is 90mm and the length of the crepe paper is 3m. Each wrapping should overlap the width of the previous wrapping by 10mm to ensure that the steel coil can be completely wrapped with the crepe paper, so as to play a role in moisture prevention.

[0021] (3) Select a plastic sheet for packaging according to the outer diameter of the steel coil. The length of the plastic sheet is 1.6m. The specific operation is as follows: lift the steel coil, insert one end of the plastic sheet into the inner ring from one side of the steel coil, and then insert it out from the other side of the inner ring of the steel coil. Then turn the plastic sheet from the side that is inserted out to the outside of the steel coil to the side that is inserted. Place the seam in the middle of the outer ring of the steel coil and use transparent tape to seal the seam so that the inner and outer rings of the steel coil are completely sealed with the plastic sheet. (4) Wrap the plastic protective board; use an overhead crane to lift the steel coil and overlap the plastic protective board at the top, and seal it with tape to prevent water from easily entering the joint at the bottom. It is clearly stipulated that the plastic protective board adopts the "top-over-bottom" overlapping method. The specifications of the plastic protective board are: thickness of 2.0mm, width of 600mm, and length of 3000mm; the plastic protective board has good resistance to breakage and impact. (5) The inner and outer protective rings and the end plates on both sides of the steel coil; Two annular plates are installed along the centerline of the wall thickness of the annular steel coil using 2.0mm plastic end protectors (foamed plates). In other words, two annular plates are installed along both ends of the steel coil. Inner and outer protective rings are provided on the inner and outer ends of the steel coil to fix the end protectors on both sides.

[0022] (6) Steel coil bundling; packing steel straps (plastic steel straps): the radial straps are packed at the 12 o'clock, 4 o'clock and 8 o'clock positions respectively, and there are a total of 4 axial straps. Two plastic steel straps are packed on the inner and outer protective rings of the steel coil, and the remaining two steel straps are divided into equal widths to connect the steel coil to the wooden bracket for packing. The steel strap clips are placed at the 2 o'clock or 10 o'clock position of the steel coil and are in a straight line. This invention features targeted optimizations to the wooden frame structure: a specialized export wooden frame that reduces the number of transverse timbers to two (80×40×700mm) and adjusts their spacing to 260-300mm, and reduces the number of longitudinal timbers in the bottom legs to one, thereby reducing weight while maintaining load-bearing capacity and significantly improving the stability of the steel coils. An adjustable "backing" device is added to the sloping end of the wooden frame to accommodate products of different coil diameters. A rubber anti-slip pad layer is added to the contact surface to fundamentally prevent lateral slippage and displacement during transportation. Anti-slip plugs are added to both ends of the wooden frame. The plug length is 350-400mm.

[0023] This embodiment makes targeted optimizations to the original wooden bracket structure: like Figures 1-4 As shown, the wooden bracket includes a three-layer frame structure. The bottom layer consists of two longitudinal side frames 1 and a central support column 2. Two transverse side frames 3 (middle layer) are vertically arranged on the two longitudinal side frames 1. Two limiting blocks 4 are vertically arranged at both ends above the two transverse side frames 3. Further, the distance between the two transverse side frames 3 is 260mm, and the two transverse side frames are cuboid structures with dimensions of 80mm×40mm×800mm. Further, the sides of the two transverse side frames are set as bevels, that is, the contact position between the two transverse side frames and the steel coil is a sloping structure with an inclination angle of 45°.

[0024] An adjustable "backing" device is added to the sloping end of the wooden frame, with a beveled edge to protect the steel coils from being dented, accommodating products of different coil diameters. A rubber anti-slip pad layer is added to the contact surface to fundamentally prevent lateral slippage and displacement during transportation. Anti-slip plugs (i.e., limit blocks on the top two sides) are added to both ends of the wooden frame; the limit blocks are 420mm long.

[0025] like Figures 5-6As shown, the inner and outer protective rings are made of cold-rolled galvanized steel sheet. The inner protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the inner end of the steel coil. One inner protective ring is set on each side of the inner ring of the steel coil. The width of the end face 5 that contacts the steel coil wall thickness direction is 50 mm, and the width of the axial face 6 that contacts the inner wall of the steel coil is 30 mm. The circumference of the inner protective ring is 1595 mm. The outer protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the outer end of the steel coil. One outer protective ring is set on each side of the outer ring of the steel coil. The width of the end face 5 that contacts the steel coil wall thickness direction is 30 mm, and the width of the axial face 6 that contacts the outer wall of the steel coil is 50 mm.

Claims

1. A method for packaging and protecting precision strip steel for automotive corrugated pipes during export transportation, characterized in that... Includes the following steps: (1) The desiccant is stored in the steel coil sleeve. The specifications of the steel coil are: inner diameter of 508mm, outer diameter of 750~850mm, and width of 580-610mm. (2) Wrap the steel coil completely with crepe paper and seal the joint with transparent tape; (3) Select the packaging plastic cloth cover according to the outer diameter of the steel coil: lift the steel coil, insert one end of the plastic cloth cover into the inner ring from one side of the steel coil, and exit from the other side of the inner ring of the steel coil. Then turn the plastic cloth cover from the exit side to the outer ring of the steel coil to the insertion side. Place the seam in the middle of the outer ring of the steel coil and seal the seam with transparent tape so that the inner and outer rings of the steel coil are completely sealed with plastic cloth covers. (4) Wrap the plastic protective plate; use an overhead crane to lift the steel coil and stick the plastic protective plate around the outside of the steel coil. The length of the protective plate is the circumference of the steel coil + 100mm, leaving the length at the joint and sealing it with tape. (5) The inner and outer protective rings and the end plates on both sides of the steel coil; Use 2.0mm plastic end guards to wrap around the centerline of the wall thickness of the annular steel coil, that is, set two annular plates along both ends of the steel coil; inner and outer protective rings are provided on the inner and outer ends of the steel coil, and the inner and outer protective rings fix the end guards on both sides. (6) Steel coil bundling; packing steel straps: the radial straps are packed at the 12 o'clock, 4 o'clock and 8 o'clock positions on the circumference, and there are 4 axial straps in total. Two plastic steel straps are packed on the inner and outer protective rings of the steel coil, and the other two steel straps are divided into equal widths to connect the steel coil to the wooden bracket for packing. The clips used to connect the two steel straps are placed at the 2 o'clock or 10 o'clock position on the circumference of the steel coil and are on a straight line.

2. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, The desiccant should be fast-acting silica gel; the storage amount of desiccant should be 0.5-1 kg per ton of steel coil, placed in a paper sleeve.

3. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, Wrap a 90mm wide piece of crepe paper around the steel coil radially. Each wrap should overlap the previous one by 10mm to ensure the steel coil is completely wrapped and to prevent moisture damage.

4. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, For steel coils with a width of 580~610mm, select a plastic cloth cover with a width of 1600mm. The length of the plastic cloth cover = steel coil width × 2 + steel coil wall thickness × 2 + (300~500)mm.

5. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, The plastic protective plate is wrapped around the outer wall of the steel coil. The length of the plastic protective plate is equal to the outer diameter circumference of the steel coil + 100mm, and the width is equal to the width of the steel coil. The plastic protective plate has good resistance to breakage and impact.

6. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, The inner and outer protective rings are made of cold-rolled galvanized steel sheet. The inner protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the inner end of the steel coil. One inner protective ring is set on each side of the inner ring of the steel coil. The end face of the inner protective ring that contacts the wall thickness of the steel coil is 50 mm wide and the axial face that contacts the inner wall of the steel coil is 30 mm wide. The circumference of the inner protective ring is (1580~1600) mm. The outer protective ring is made of galvanized steel sheet with a thickness of 1.0 mm and is set at the outer end of the steel coil. One outer protective ring is set on each side of the outer ring of the steel coil. The end face of the outer protective ring that contacts the wall thickness of the steel coil is 30 mm wide and the axial face that contacts the outer wall of the steel coil is 50 mm wide.

7. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 1, characterized in that, The wooden bracket includes a three-layer frame structure. The bottom layer consists of two longitudinal side frames and a central support column. Two transverse side frames are vertically arranged on the two longitudinal side frames, and two limiting blocks are vertically arranged at both ends above the two transverse side frames.

8. The packaging and protection method for precision strip steel for automotive corrugated pipes during export transportation according to claim 7, characterized in that, The distance between the two horizontal borders is 260mm~300mm. The two horizontal borders are rectangular structures with dimensions of 80mm×40mm×800mm. The sides of the two horizontal borders are set as bevels, that is, the contact points between the two horizontal borders and the steel coil are sloping structures.

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