Side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging

Abstract

The invention discloses a side wrapping method for tin-plated / chrome-plated cold-rolled steel plate package packaging, and the operating steps and control conditions are as follows: 1. Corrugated paper with an anti-rust film is laid on the upper and lower sides of the plate package, with a thickness w0=w1 / 0.74; w1 is the thickness of the anti-rust paper; 2. Anti-rust paper of a certain length and width is pulled out to wrap the side of the steel plate, and the thickness w1 of the anti-rust paper is obtained based on the quantitative G of the anti-rust paper and the tightness D of the anti-rust paper; the folding height of the bottom and top of the anti-rust paper; 3. Tape is applied to the junction of the anti-rust paper after the side wrapping, and the upper and lower ends of the anti-rust paper are folded according to the folding height m of the bottom end of the rust paper and the folding height n of the top end of the rust paper, and the anti-rust paper at the junction of each corner is taped; 4. An angle steel corner guard with a buffer protection device is added to the edge of the plate package; and the angle steel corner guard is squeezed by a strapping tape to make the anti-rust paper at the junction between the anti-rust paper and the corrugated paper concave.

Description

Technical Field

[0001] The invention belongs to the cold-rolled tin-plated steel plate package technology, and relates to a side wrapping method for cold-rolled steel plate package, which is mainly used for tin-plated products, especially chrome-plated products. Background Art

[0002] Tin-plated and chrome-plated products are primarily used in the food packaging industry, which places stringent demands on surface quality. Any contamination during production, packaging, and transportation can degrade the surface quality, leading to corrosion on the steel plate. This corrosion not only severely impacts user experience but also severely damages the company's profits and reputation. Tin-plated and chrome-plated plates are packaged in humid, coastal areas, and with long transportation turnaround times, making their surfaces and edges more susceptible to corrosion and contamination. Therefore, creating a sealed environment for chrome-plated plates during transportation and storage is crucial.

[0003] Existing tin-plated and chrome-plated sheet packaging utilizes a top-cover packaging method. The anti-rust paper is unevenly positioned on the wooden platform below, and during the tinplate packaging process, errors in paper cutting and packaging result in inconsistent sagging lengths. This leads to poor flatness on the sides of the anti-rust paper during tape application, which can severely result in loose packaging, a weak seal, and even packaging failure. With this packaging method, the lower anti-rust paper cannot remain parallel to the horizontal surface of the wooden platform, resulting in poor packaging accuracy. The flipped bottom layer of anti-rust paper increases the chance of contact during folding, making the lower layer susceptible to contamination of the sheet, impacting quality and appearance. Furthermore, opening the bottom layer of anti-rust paper can interfere with forklift transportation and insertion, causing inconvenience in subsequent use. Existing packaging formats are no longer suitable for packaging development and product quality requirements.

[0004] Therefore, it is necessary to propose a new plate packaging method, which has important practical significance for controlling the surface properties of cold-rolled thin steel plates and improving the market competitiveness of tin-plated and chromium-plated products. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the above-mentioned shortcomings of the prior art and provide a side covering method for tin-plated / chrome-plated cold-rolled steel plate package packaging with good sealing performance, material saving, and easy packaging and removal.

[0006] The technical problem to be solved can be implemented through the following technical solutions.

[0007] A side wrapping method for tinned / chrome-plated cold-rolled steel plate packaging, characterized by the following operating steps and control conditions:

[0008] (1) Lay a corrugated paper with an anti-rust film on each of the upper and lower sides of the board package. Its length-width specification is l0*d0, where: l0 is the length of the steel plate to be covered (mm), and d0 is the width of the steel plate to be covered (mm); its thickness w0 (mm) is determined by the thickness of the anti-rust paper: w0 = w1 / 0.74

[0009] Among them, w1 is the thickness of the anti-rust paper (mm);

[0010] The corrugated paper below is laid on the wooden bearing platform;

[0011] (2) Select the corresponding anti-rust paper, stretch out the anti-rust paper with a certain length and width to cover the side of the steel plate. When covering, the anti-rust paper has a certain tightness;

[0012] (3) Conduct tape pasting treatment at the junction of the anti-rust paper after side covering, and fold the upper and lower ends of the anti-rust paper according to the folding height m at the bottom end and the folding height n at the top end of the anti-rust paper, and conduct tape pasting treatment on the anti-rust paper at the junction of each corner;

[0013] (4) Add angle steel corner guards with buffer protection devices at the edge of the board package; and squeeze the angle steel corner guards through bundling straps.

[0014] As a further improvement of this technical solution, the specific selection method of the material and specification of the anti-rust paper is as follows:

[0015] (a) The thickness w1 of the anti-rust paper adopts the following technical formula:

[0016]

[0017] The tightness D (g / dm ) of the anti-rust paper is determined by the following formula 1:

[0018] D = b·v + 0.19 (1)

[0019] The basis weight G (g / m 2 ) of the anti-rust paper is determined by the following formula 2:

[0020] Among them, v is the basic tightness value corresponding to the anti-rust paper, and here it is taken as 0.625 g / dm 3 ;

[0021] b is the transportation distance coefficient. When the transportation distance x of the board package is ≤ 2000 km, 2000 km < x ≤ 4000 km or 4000 km < x, b takes 0.5, 0.7 or 0.9 respectively;

[0022] ξ is the conversion coefficient. For tinplate, ξ = 0.68 g / m 4 , for chromed plate, ξ = 0.71 g / m4 ;

[0023] h0 is the total height of the cladding steel plate (mm);

[0024] (b) The stretching allowance of the anti-rust paper c (mm) = 0.05 l0, and the stretching length L of the anti-rust paper is expressed as follows:

[0025] L=2·l0+2·d0+c (3)

[0026] (c) The range of the folded height m (mm) of the bottom of the anti-rust paper is: Max [0.015·l0, 0.015·d0] < m < 80mm; the range of the folded height n (mm) of the top of the anti-rust paper is:

[0027] Max[0.015·l0,0.015·d0]<n<Min[0.16·l0,0.16·d0];

[0028] The specific height H (mm) of the anti-rust paper is as shown in the following formula 4:

[0029] H=h0+m+n (4).

[0030] Furthermore, in step (3), when the lower end of the rust-proof paper is folded, the final folded edge is in contact with the lower end surface of the wooden supporting plate.

[0031] Furthermore, in step (4), when the strapping squeezes the angle steel corner guard, the anti-rust paper is sunken at the junction between the anti-rust paper and the corrugated paper.

[0032] As a further improvement of the present technical solution, in step (4), the corresponding steel plate edge quality requirement coefficient ε (mm) is determined according to the steel plate edge quality. 2 / N) is between 1 and 0.6;

[0033] The length l1 (mm) of the angle steel corner guard is determined by the height of the covered steel plate. Its length is 0.8h0<l1<h0, and the height is l1 / 7;

[0034] Determine the thickness w (mm) of the angle steel corner guard by selecting from formula 5:

[0035]

[0036] Where: a is the thickness of a single steel plate (mm); k is the hardness of the steel plate; e is the strapping force (N).

[0037] Preferably, in step (4), the edge quality of the steel plate is divided into four grades: A, B, C and D according to the rust, discoloration, collision and wear of the edge quality of the steel plate, and the corresponding edge quality requirement coefficient ε (mm 2 / N) are 0.9~1, 0.8~0.9, 0.7~0.8 and 0.6~0.7 respectively.

[0038] As a further improvement of the technical solution, the strapping force on the angle steel corner guard is 6 to 8 kN; the longer the corresponding side length of the plate package, the more straps are needed for the corresponding side.

[0039] Among them, when the corresponding side length of the board package is ≥1150mm, the corresponding side length of the board package is 950mm≤<1150mm, the corresponding side length of the board package is 750mm≤<950mm and the corresponding side length of the board package is <750mm, the number of straps for the corresponding sides are 5, 4, 3 and 2 respectively.

[0040] Also as a further improvement of the present technical solution, the anti-rust paper comprises a layered composite structure consisting of a vapor phase corrosion inhibitor, an anti-rust paper base paper, a polyethylene layer and a woven cloth layer.

[0041] Preferably, the wooden loading pallet is a transfer pallet.

[0042] The side wrapping method employing the above-mentioned technical solution can replace existing top-cover packaging, resolving issues such as the bottom seal of the anti-rust paper and contamination of the auxiliary anti-rust paper. Compared to existing conventional side wrapping technologies, it achieves precise positioning of the bottom anti-rust paper and the wooden platform, while also removing the auxiliary anti-rust paper from the lower end of the anti-rust paper. This reduces the number of steps, improves operational convenience, and reduces material costs. A unique technique, in which the upper end of the anti-rust paper, through the strapping, imparts a force to the edge anti-rust paper on the steel corner protector, causing the anti-rust paper to indent at the interface with the corrugated paper, achieves a superior seal. Furthermore, the tightness of the anti-rust paper is correlated with transport quality; this wrapping technology, which takes the impact of the anti-rust paper height on packaging quality into account, conserves materials and facilitates packaging and removal.

[0043] Furthermore, the novel side-enclosed packaging provided by the present invention allows the portions of the upper and lower sections of the rust-proof paper that extend beyond the steel plate to be folded inward, eliminating the issues of loose bottom rust-proof paper packaging, a weak seal, and packaging failure during tip-over packaging. This significantly reduces the use of rust-proof paper, saves materials, and improves packaging efficiency. Furthermore, the rust-proof paper structure with a buffering device provides excellent buffering and protection for the rust-proof paper. The depression at the junction of the corrugated paper and the rust-proof paper, formed by the compression force of the bundle, also creates a sealed environment for the steel plate. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] Figure 1 It is a packaging flow chart of the present invention;

[0045] Figure 2 This is a half-section view of the steel plate after packaging;

[0046] Figure 3 yes Figure 2A partial enlarged cross-sectional view at point A;

[0047] Figure 4 It is a sealing principle diagram of the packaging method of the present invention;

[0048] Figure 5 It is a schematic diagram of the force on the steel corner guard;

[0049] Figure 6 This is a force diagram of the steel corner guard from another angle. DETAILED DESCRIPTION

[0050] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings.

[0051] The present invention provides a packaging method for tin-plated, especially chrome-plated, plates, including a packaging method and material requirements for the packaging. Compared with the original upper cover packaging form, the packaging method has the effects of good sealing, moisture-proof and water-proof, and pollution avoidance, while saving materials and improving packaging and unpacking efficiency.

[0052] The side wrapping method for cold-rolled steel plate packaging of the present invention has a specific packaging process as follows: Figure 1 shown.

[0053] The structure after packaging is as follows Figure 2 and Figure 3 This method can fold the upper and lower sections of the anti-rust paper beyond the steel plate, and use the strapping to transfer a force to the edge of the anti-rust paper on the steel corner, so that the anti-rust paper at the junction between the anti-rust paper and the corrugated paper is sunken, and at the same time, by sticking the tape at the corner junction, a closed space is formed, as shown. Figure 4 shown.

[0054] in, Figures 2 to 6 Among them, 1 is steel plate, 2 is corrugated paper, 3 is wooden table top, 4 is anti-rust paper, 5 is tape, 6 is steel corner protector, and 7 is strapping.

[0055] The innovation and characteristics of the side wrapping method of cold-rolled steel plate packaging are as follows:

[0056] 1. This solves the problem of loose bottom anti-rust paper packaging, loose sealing, and packaging failure in the previous top-cover packaging process. At the same time, the auxiliary anti-rust paper under the steel plate is eliminated, avoiding contamination by the bottom anti-rust paper during the packaging process. At the same time, the use of anti-rust paper is greatly reduced, saving materials and improving packaging efficiency.

[0057] 2. By using steel plates of different specifications and anti-rust papers of different structures, the length of the upper and lower ends of the anti-rust paper that need to be folded, the stretching length and the specifications of the corrugated paper are specified. This not only avoids the situation of loose sealing caused by excessive overlapping gaps of anti-rust paper that is too long, and loose sealing caused by incomplete coverage of anti-rust paper that is too short, but also accurately obtains the use length of the anti-rust paper, saves materials and improves packaging efficiency.

[0058] 3. The enclosed space formed by the deformation of the anti-rust paper itself has better sealing than the original sealing that can only be ensured by tape. At the same time, since only the corner junctions are pasted, it not only greatly saves the use of tape, but also the pasting of a small amount of tape makes it more convenient for users to unpack.

[0059] 4. For steel plates of different specifications and different user requirements, the steel plate edges are graded and the steel corner protectors are selected based on the grade and the extrusion pressure of the strapping. This structure not only provides a good buffering and protection for the anti-rust paper, but also prevents damage to the anti-rust paper wrapped around the steel plate due to bumps and collisions during transportation in complex environments, thus preventing packaging failure. It also saves material for the steel corner protectors.

[0060] 5. Regulate the height of the anti-rust paper to prevent the board package from not being completely covered by the anti-rust paper due to insufficient height margin of the anti-rust paper; or the board package from being completely covered by the anti-rust paper due to excessive height margin of the anti-rust paper, which will cause the anti-rust paper to collapse before being folded, causing inconvenience in packaging.

[0061] 6. This packaging form is easy to operate, improves the fit of the anti-rust paper on the side of the board package, makes unpacking easy, and improves work efficiency.

[0062] The main steps and requirements of the packaging process are as follows:

[0063] Steps:

[0064] (1) Place a piece of corrugated paper with anti-rust film on the upper and lower sides of the plate package. The length and width specifications are l0*d0, where: l0 is the length of the covered steel plate (mm), d0 is the width of the covered steel plate (mm); its thickness w0 (mm) is determined by the thickness of the anti-rust paper:

[0065] w0 (corrugated paper thickness) = w1 (anti-rust paper thickness) / 0.74

[0066] (2) Select the appropriate anti-rust paper and stretch out the anti-rust paper of a certain length and width to cover the side of the steel plate. The specific selection method of the material and specifications is as follows:

[0067] (a) Anti-rust paper is composed of vapor phase corrosion inhibitor, anti-rust paper base paper, polyethylene layer and woven cloth layer. The selection of anti-rust paper material is mainly to select the thickness of the anti-rust paper base paper. The thickness of the anti-rust paper is determined by the quantitative and tightness of the anti-rust paper:

[0068]

[0069] The quantity and tightness of the anti-rust paper are determined by the distance of the plate package transportation and the size of the steel plate.

[0070] As the transport distance increases, the board package will spend more time in transit, experiencing bumps and collisions, and the requirements for anti-rust paper will also increase. This factor can be converted into a corresponding transport distance coefficient b, the value of which is determined in Table 1 below. Basis weight, thickness, and density are the basic parameters of paper and can reflect the basic physical properties of paper.

[0071] Table 1: Transport distance coefficients;

[0072] Transport distance x x≤2000km 2000km<x≤4000km 4000km<x b 0.5 0.7 0.9

[0073] The tightness of the anti-rust paper is D (g / dm 3 ) is determined by the following formula 1:

[0074] D=b·v+0.19 (1)

[0075] Where: v is the basic tightness of the anti-rust paper, here it is 0.625g / dm 3 .

[0076] The quantitative G of the anti-rust paper is determined by the following formula 2:

[0077]

[0078] Where: ξ is the conversion coefficient, which is determined by the steel plate material. For tinplate, ξ=0.68g / m 4 ; Chrome plate takes ξ=0.71g / m 4 ; h0 is the total height of the cladding steel plate (mm).

[0079] (b) The stretched length of the anti-rust paper must be sufficient to completely cover the four sides of the steel plate. At the same time, in order to avoid leaving gaps at the junction of the anti-rust paper, which may cause packaging failure and facilitate the reliability of the tape at the junction, a certain margin needs to be added when calculating the stretched length of the anti-rust paper. At the same time, if the margin is too much, a large amount of gaps will be left in the overlapping part of the anti-rust paper, which may cause loose packaging. The margin is obtained from experience: c (margin mm) = 0.05l0 (steel plate length mm). Therefore, the stretched length L of the anti-rust paper is shown in Formula 3:

[0080] L=2·l0+2·d0+c (3)

[0081] (c) After the length requirement of the anti-rust paper is met, its height needs to be specified. If the height of the anti-rust paper is not enough, the plate package cannot be completely covered by the anti-rust paper; if the height margin of the anti-rust paper is too much, it will cause the anti-rust paper to collapse before folding, causing inconvenience in packaging. At the same time, the overlapping part of the anti-rust paper will cause the anti-rust paper on the top of the plate package to be uneven. During transportation in a complex environment, it will cause indentations on the plate surface of the plate package due to bumps, collisions, etc.

[0082] The value range of the folded height m (mm) of the bottom of the anti-rust paper is: Max[0.015l0,0.015d0]<m<80mm;

[0083] The value range of the folded height n (mm) of the top of the anti-rust paper is: Max [0.015·l0, 0.015·d0]<n<Min [0.16·l0, 0.16·d0];

[0084] According to the height h0 of the coated steel plate, the folded height m of the bottom end of the anti-rust paper and the folded height n of the top end of the anti-rust paper, the specific height H of the anti-rust paper is determined, as shown in formula 4

[0085] H=h0+m+n (4)

[0086] (3) Apply tape to the junction of the rust-proof paper after the side panels are covered, fold the upper and lower ends of the rust-proof paper, and apply tape to the junction of each corner. In other words, fold the excess rust-proof paper at the lower end back to the lower end surface.

[0087] (4) In order to prevent the steel plate edges from being scratched and the anti-rust paper from being damaged in a complex transportation environment, steel corner guards with buffer protection devices are added to the plate edge. At the same time, in order to form a closed environment inside the steel plate, the steel corner guards are squeezed by the strapping tape, and the steel corner guards squeeze the anti-rust paper on the plate edge, so that the anti-rust paper at the junction between the anti-rust paper and the corrugated paper is sunken. By cooperating with the tape at the junction of the corners, a closed space is formed. The selection of the strapping force on the steel corner guard and the size of the steel corner guard are selected according to the following method:

[0088] (a) The steel corner guard is mainly subjected to the extrusion force of the strapping. The strapping force is mainly determined by the strapping capacity of the baler. The common baler tensioning force on site is 6 to 8 kN. The number of straps is determined by the specifications of the board package, which is specifically determined by the following Table 2.

[0089] Table 2: Methods for determining the number of straps

[0090] Board edge length (mm) <750 ≥750，<950 ≥950，<1150 ≥1150 Number of straps 2 3 4 5

[0091] (b) According to the different strapping force, steel plate edge quality requirements and transportation distance, different thicknesses of corner guards can be appropriately selected. The stress on the steel corner guard is as follows: Figure 5 and Figure 6 shown.

[0092] The quality of steel plate edges is divided into four grades according to the rust, discoloration, collision and wear of the steel plate edges. The grade scoring standards are shown in Table 3 below. The better the quality of the strip edge, the higher the corresponding quality score.

[0093] Table 3: Steel plate edge quality grade scoring standard;

[0094]

[0095] The specific specifications and dimensions of the steel corner guard are determined by the length and height of the covered steel plate (l1 is the length of the steel corner guard). Its length is 0.8h0<l1<h0, and its height is l1 / 7. The thickness of the steel corner guard is determined by the thickness a of the single steel plate, the hardness k of the steel plate, the quality requirement coefficient ε of the steel plate corner, the transportation distance coefficient b and the strapping force e. Its specific thickness w is selected according to the following formula 5:

[0096]

[0097] The following is a more specific implementation method:

[0098] Example 1:

[0099] The tinplate package with the length, width and height specifications of 900mm×700mm×300mm, the thickness of a single steel plate of 0.3mm and the hardness of 70HRB is covered. The transportation distance is 1500km. The edge quality of the steel plate is required to reach Grade B or above. The corresponding transportation distance coefficient is b=0.5, and the tightness of the anti-rust paper is D=0.5025g / dm 3 The quantitative weight of the anti-rust paper is G = 0.1632g / m 2 Therefore, anti-rust paper with a thickness of w1 = 0.32 mm is selected for wrapping.

[0100] (1) At the beginning, a wooden platform corresponding to the size of the board package is placed at the outlet of the unit, and a piece of corrugated paper with an anti-rust film is laid on it. The length and width specifications are 900mm×700mm; its thickness is w0=0.43mm.

[0101] (2) After the steel plates are cut by the cross-cutting unit, they are neatly stacked on the wooden platform at the outlet end of the unit.

[0102] (3) Place a piece of corrugated paper of the same size and specifications on top of the steel plate.

[0103] (4) Stretch out a certain length and height of anti-rust paper from the anti-rust paper roll, with the stretched length L = 3.245m. The folded height m of the bottom end of the anti-rust paper is 50mm, and the folded height n of the top end is 70mm, and the specific height H of the anti-rust paper is determined to be 420mm. Wrap the stretched anti-rust paper around the board package, leaving a folded height of 70mm at the top, and cover the sides of the board package with the anti-rust paper.

[0104] (5) Apply tape to the junction of the anti-rust paper after the side panels are covered, fold the upper and lower ends of the anti-rust paper, and apply tape to the junction of the anti-rust paper at each corner.

[0105] (6) Add steel corner guards with buffer protection devices to the edge of the board. First fix the bottom corner guard, then complete the fixation of the side corner guards, and finally complete the fixation of the top corner guard. After the corner guards are fixed, they are tied and fixed with straps.

[0106] The number of straps is determined by the board package specifications: three straps are used for the long sides and two straps are used for the short sides. The baler's tension is 8 kN, and the steel plate corner quality score is 0.9. The steel corner guards used are 250 mm long, 35.71 mm high, and 6 mm thick. The baler's tension forces the steel corner guards against the anti-rust paper, creating a depression and a sealed environment.

[0107] At this point, all the work processes of the inner packaging are completed, and the outer packaging is packed with an iron box cover and strapping. The process is the same as the previous one and will not be repeated here.

[0108] The following is a detailed calculation description of the relevant data in Example 1:

[0109] Refer to the plate package with the length, width and height specifications of 900mm×700mm×300mm, the thickness of a single steel plate is 0.3mm, the hardness is 70HRB, the transportation distance is 1500km, and the quality of the steel plate corners is required to reach Grade B or above. According to the transportation distance in Table 1, the corresponding transportation distance coefficient b=0.5 is selected, and the tightness of the anti-rust paper is D=b·0.625+0.19=0.5×0.625+0.19=0.5025g / dm 3 , the quantitative amount of anti-rust paper is Therefore, the thickness is selected as Wrapped with anti-rust paper.

[0110] (1) At the beginning, a wooden platform corresponding to the size of the board package is placed at the outlet of the unit, and a piece of corrugated paper with an anti-rust film is laid on it. The length and width specifications are 900mm×700mm; the thickness is

[0111] (2) After the steel plates are cut by the cross-cutting unit, they are neatly stacked on the wooden platform at the outlet end of the unit.

[0112] (3) Place a piece of corrugated paper of the same size and specifications on top of the steel plate.

[0113] (4) Stretch out a certain length and height of anti-rust paper from the anti-rust paper roll, and the stretched length is L = 2·l0 + 2d0 + c = 2·l0 + 2d0 + 0.5·l0 = 2×700 + 2×900 + 0.05×900 = 3245 mm = 3.245 m. The folded height m of the bottom of the anti-rust paper is 50mm if Max[0.015·l0,0.015·d0]<m<80mm, i.e. Max[13.5,10.5]<m<80mm. The folded height n of the top is 70mm if Max[0.015·l0,0.015·d0]<n<Min[0.16·l0,0.16·d0], i.e. Max[13.5,10.5]<n<Min[144,112]. The specific height H of the anti-rust paper is determined to be H=h0+m+n=70+50+300=420mm. Wrap the stretched anti-rust paper around the board package, leaving a folded height of 70mm at the top, and cover the sides of the board package with the anti-rust paper.

[0114] (5) Apply tape to the junction of the anti-rust paper after the side panels are covered, fold the upper and lower ends of the anti-rust paper, and apply tape to the junction of the anti-rust paper at each corner.

[0115] (6) Add steel corner guards with buffer protection devices to the edge of the board. First fix the bottom corner guard, then complete the fixation of the side corner guards, and finally complete the fixation of the top corner guard. After the corner guards are fixed, they are tied and fixed with straps.

[0116] The number of straps is determined by the specifications of the plate package. 3 straps are used for binding and fixing on the long side, and 2 straps are used for binding and fixing on the short side (determined according to the side length and Table 2). The strapping force is 8KN, and the quality score of the steel plate corners is 0.9 (determined according to the quality score level and Table 3). The length of the steel corner guard is 0.8h0<l1<h0, that is, 0.8×300<m<300, which is 250mm. The height is l1 / 7=250 / 7=35.71mm, and the thickness is The tension of the baler causes the steel corner guard to squeeze the anti-rust paper, forming a depression and forming a closed environment.

[0117] At this point, all the work processes of the inner packaging are completed, and the outer packaging is packed with an iron box cover and strapping. The process is the same as the previous one and will not be repeated here.

[0118] Example 2:

[0119] The plate package with the length, width and height of 750mm×750mm×350mm, the thickness of a single steel plate is 0.25mm, and the hardness is 85HRB. The transportation distance is 5000km. The edge quality of the steel plate is required to reach B grade or above. The corresponding transportation distance coefficient is b=0.9, and the tightness of the anti-rust paper is D=0.7525g / dm 3 The weight of the anti-rust paper is G = 0.27g / m 2 Therefore, anti-rust paper with a thickness of w1 = 0.36 mm is selected for wrapping.

[0120] (1) At the beginning, a wooden platform corresponding to the size of the board package is placed at the outlet of the unit, and a piece of corrugated paper with an anti-rust film is laid on it. The length and width specifications are 750mm×750mm; its thickness is w1=0.49mm.

[0121] (2) After the steel plates are cut by the cross-cutting unit, they are neatly stacked on the wooden platform at the outlet end of the unit.

[0122] (3) Place a piece of corrugated paper of the same size and specifications on top of the steel plate.

[0123] (4) Stretch out a certain length and height of anti-rust paper from the anti-rust paper roll, with the stretched length L = 3.04m. The folded height m of the bottom end of the anti-rust paper is 50mm, and the folded height n of the top end is 70mm, and the specific height H of the anti-rust paper is determined to be 470mm. Wrap the stretched anti-rust paper around the board package, leaving a folded height of 70mm at the top, and cover the sides of the board package with the anti-rust paper.

[0124] (5) Apply tape to the junction of the anti-rust paper after the side panels are covered, fold the upper and lower ends of the anti-rust paper, and apply tape to the junction of the anti-rust paper at each corner.

[0125] (6) Add steel corner guards with buffer protection devices to the edge of the board. First fix the bottom corner guard, then complete the fixation of the side corner guards, and finally complete the fixation of the top corner guard. After the corner guards are fixed, they are tied and fixed with straps.

[0126] The number of straps is determined by the board package specifications, with three straps used for each edge. The baler's tension is 8 kN, and the steel plate corner quality score is 0.85. The steel corner guards used are 300 mm long, 42.86 mm high, and 10.08 mm thick. The baler's tension forces the steel corner guards against the anti-rust paper, creating a depression and a sealed environment.

[0127] At this point, all the work processes of the inner packaging are completed, and the outer packaging is packed with an iron box cover and strapping. The process is the same as the previous one and will not be repeated here.

[0128] Example 3:

[0129] The plate package with the length, width and height specifications of 1000mm×900mm×300mm, the thickness of a single steel plate is 0.3mm, and the hardness is 70HRB is covered. The transportation distance is 3000km. The edge quality of the steel plate is required to reach Grade B or above. The corresponding transportation distance coefficient b=0.7, and the tightness of the anti-rust paper is D=0.6275g / dm 3 The quantitative weight of the anti-rust paper is D = 0.6275g / m 2 Therefore, anti-rust paper with a thickness of w1 = 0.43 mm is selected for wrapping.

[0130] (1) At the beginning, a wooden platform corresponding to the size of the board package is placed at the outlet of the unit, and a piece of corrugated paper with an anti-rust film is laid on it. The length and width specifications are 1000mm×900mm; its thickness is w0=0.58mm.

[0131] (2) After the steel plates are cut by the cross-cutting unit, they are neatly stacked on the wooden platform at the outlet end of the unit.

[0132] (3) Place a piece of corrugated paper of the same size and specifications on top of the steel plate.

[0133] (4) Stretch out a certain length and height of anti-rust paper from the anti-rust paper roll, with the stretched length L = 3.85m. The folded height m of the bottom end of the anti-rust paper is 50mm, and the folded height n of the top end is 70mm, and the specific height H of the anti-rust paper is determined to be 420mm. Wrap the stretched anti-rust paper around the board package, leaving a folded height of 70mm at the top, and cover the sides of the board package with the anti-rust paper.

[0134] (5) Apply tape to the junction of the anti-rust paper after the side panels are covered, fold the upper and lower ends of the anti-rust paper, and apply tape to the junction of the anti-rust paper at each corner.

[0135] (6) Add steel corner guards with buffer protection devices to the edge of the board. First fix the bottom corner guard, then complete the fixation of the side corner guards, and finally complete the fixation of the top corner guard. After the corner guards are fixed, they are tied and fixed with straps.

[0136] The number of straps is determined by the board package specifications: four straps are used on the long sides and three on the short sides. The baler's tension is 8 kN, and the steel plate corner quality score is 0.9. The steel corner guards used are 250 mm long, 35.71 mm high, and 8.4 mm thick. The baler's tension forces the steel corner guards against the anti-rust paper, creating a depression and a sealed environment.

[0137] At this point, all the work processes of the inner packaging are completed, and the outer packaging is packed with an iron box cover and strapping. The process is the same as the previous one and will not be repeated here.

Claims

1. A side wrapping method for tinned / chrome-plated cold-rolled steel plate packaging, characterized in that: The operating steps and control conditions are as follows: (1) Lay a piece of corrugated paper with an anti-rust film on each of the upper and lower sides of the board package. The length and width specifications are l0*d0, where: l0 is the length of the steel plate to be covered, and d0 is the width of the steel plate to be covered; its thickness w0 is determined by the thickness of the anti-rust paper: w0 = w1 / 0.74 where, w1 is the thickness of the anti-rust paper; the units of l0, d0, w0, and w1 are mm; The corrugated paper below is laid on the wooden bearing platform; (2) Select the corresponding anti-rust paper, stretch out a certain length and width of anti-rust paper to cover the side of the steel plate. When covering, the anti-rust paper has a certain tightness; (3) Conduct tape pasting treatment at the junction of the anti-rust paper after covering the side. Fold the upper and lower ends of the anti-rust paper according to the folding height m at the bottom end and the folding height n at the top end of the anti-rust paper, and conduct tape pasting treatment on the anti-rust paper at the junction of each corner; (4) Add angle steel corner guards with buffer protection devices to the edges of the board package; and squeeze the angle steel corner guards with bundling straps; where, determine the corresponding coefficient ε of the quality requirement of the steel plate corner according to the quality of the steel plate corner, and ε is between 1 and 0.6; Determine that the length l1 of the angle steel corner guard is determined by the height of the steel plate to be covered, and its length is taken as 0.8h0 < l1 < h0, and the height is l1 / 7; Determine the thickness w of the angle steel corner guard according to the following formula: Where: a is the thickness of a single steel plate; k is the hardness of the steel plate; e is the strapping force; ε is in mm 2 / N; the unit of l1, w and a is mm; the unit of e is N; b is the transportation distance coefficient. When the transportation distance x of the board package is x ≤ 2000km, 2000km < x ≤ 4000km, or 4000km < x, b takes 0.5, 0.7, or 0.9 respectively.

2. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: The specific selection method of the material and specification of the anti-rust paper is as follows: (a) The thickness w1 of the anti-rust paper adopts the following technical formula: The tightness D of the anti-rust paper is determined by Formula 1 below: Formula 1: D = b·v + 0.19 The basis weight G of the anti-rust paper is determined by Formula 2 below: Formula 2: Among them, v is the basic tightness of the anti-rust paper, here it is 0.625g / dm 3 ; ξ is the conversion coefficient, and ξ for tinplate is 0.68g / m 4 , chrome plate takes ξ=0.71g / m 4 ; h0 is the total height of the cladding steel plate; the unit of w1 and h0 is mm; the unit of D is g / dm 3 ; The unit of G is g / m 2 ; (b) The stretching allowance c of the anti-rust paper = 0.05·l0, and the stretching length L of the anti-rust paper is shown in Formula 3 below: Formula 3: L = 2·l0 + 2·d0 + c where, the unit of c is mm; (c) The value range of the folding height m at the bottom end of the anti-rust paper is: Max[0.015·l0, 0.015·d0] < m < 80mm; the value range of the folding height n at the top end of the anti-rust paper is: Max[0.015·l0, 0.015·d0] < n < Min[0.16·l0, 0.16·d0]; The specific height H of the anti-rust paper is shown in Formula 4 below, Formula 4: H = h0 + m + n where, the units of m, n, and H are mm; 3. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: In step (3), when folding the lower end of the anti-rust paper, the final folding edge fits to the lower end face of the wooden bearing platform.

4. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: In step (4), when squeezing the angle steel corner guard with the bundling strap, the anti-rust paper at the junction between the anti-rust paper and the corrugated paper sinks in.

5. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: In step (4), the edge quality of the steel plate is divided into four grades: A, B, C and D according to the rust, discoloration, collision and wear of the edge quality of the steel plate, and the corresponding edge quality requirement coefficient ε is determined to be 0.9-1, 0.8-0.9, 0.7-0.8 and 0.6-0.7 respectively; wherein the unit of ε is mm 2 / N.

6. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to any one of claims 1 to 5, characterized in that: The bundling force of the bundling strap on the angle steel corner guard is 6 - 8KN; the longer the corresponding side length of the board package, the more the number of bundling straps on the corresponding side.

7. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 6, characterized in that: When the corresponding side length of the board package is ≥ 1150mm, 950mm ≤ the corresponding side length of the board package < 1150mm, 750mm ≤ the corresponding side length of the board package < 950mm, and the corresponding side length of the board package < 750mm, the number of bundling straps on the corresponding side is 5, 4, 3, and 2 respectively.

8. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: The anti-rust paper is a layered composite structure consisting of a vapor phase corrosion inhibitor, an anti-rust paper base paper, a polyethylene layer and a woven cloth layer.

9. The side wrapping method for tinned / chrome-plated cold-rolled steel sheet packaging according to claim 1, characterized in that: The wooden load-bearing pallet is a transfer pallet.

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