Double-sided reticulated color-coated sheet and preparation method thereof

Abstract

The invention relates to a double-sided reticulated color-coated plate and a preparation method thereof, and belongs to the technical field of color-coated steel plates. The method comprises the following steps: obtaining a substrate; carrying out first coating, first curing and first cooling on the two surfaces of the substrate to obtain an intermediate coating substrate; second coating, second curing and second cooling are conducted on the two surfaces of the middle coating base plate, the double-face reticulate pattern color-coated plate is obtained, the second cooling comprises spray cooling, and the spray pressure of the spray cooling is 6.5-7.5 bar; spray cooling with the spray pressure of 6.5-7.5 bar is adopted, the large spray pressure can enable cooling liquid to have a good atomization effect, use of the cooling liquid can be reduced under the condition that the good cooling effect is achieved, then residues of the cooling liquid are reduced, the risk that water is carried on the surface is reduced, and the problem that an existing double-face reticulate color-coated sheet cannot be produced is solved.

Description

Technical Field

[0001] The present application relates to the technical field of color coated steel plates, and in particular to a double-sided textured color coated plate and a preparation method thereof. Background Art

[0002] The textured color-coated plate is a special color-coated plate. Due to the grid-like three-dimensional effect on its surface, it is a color-coated plate product with a special morphology and material surface, and is deeply loved by users in the construction and decoration industry. The advantage of the textured color-coated plate is that it has a very low gloss because of its three-dimensional grid effect on the surface. When used as an outdoor building material, it is almost non-reflective and will not cause light pollution to other external environments or buildings. However, because its surface has a three-dimensional textured effect rather than a flat contact material surface, it is more likely to cause risks such as surface water and coil collapse. At present, there is a preparation plan for single-sided textured color-coated plates, but the use of this plan to prepare double-sided textured color-coated plates still has the risk of surface water, which makes it impossible to produce smoothly. Summary of the invention

[0003] The present application provides a double-sided textured color-coated plate and a preparation method thereof, so as to solve the problem that the current double-sided textured color-coated plate cannot be produced.

[0004] In a first aspect, the present application provides a method for preparing a double-sided textured color-coated plate, the method comprising:

[0005] obtaining a substrate;

[0006] Performing a first coating, a first curing and a first cooling on both surfaces of the substrate to obtain an intermediate coating substrate;

[0007] The two surfaces of the intermediate coating substrate are subjected to a second coating, a second curing and a second cooling to obtain a double-sided textured color coated plate, wherein the second cooling includes spray cooling, and the spray pressure of the spray cooling is 6.5 bar to 7.5 bar.

[0008] As an optional implementation, the second cooling also includes air cooling, and the wind pressure of the air cooling is ≥361Pa.

[0009] As an optional implementation manner, the temperature of the substrate at the end point of the spray cooling is ≤70°C.

[0010] As an optional implementation, the exit looper of the substrate at the end point of the spray cooling adopts a high-loop volume operation mode, and the loop volume of the high-loop volume operation mode is 45% to 55%.

[0011] As an optional implementation manner, the coating roller pressure of the second coating is 140kg-160kg.

[0012] As an optional embodiment, the second curing includes 5 stages of baking, wherein the first stage baking temperature is 175°C to 185°C, the second stage baking temperature is 195°C to 205°C, the third stage baking temperature is 220°C to 230°C, the fourth stage baking temperature is 240°C to 250°C, and the fifth stage baking temperature is 270°C to 280°C; and / or

[0013] During the second curing process, the plate temperature PMT of the intermediate coating substrate is 224°C to 232°C.

[0014] As an optional embodiment, the substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the chemical composition of the substrate comprises, by mass fraction: C: <0.003%, Si: <0.03%, Mn: 0.11% to 0.15%, P: <0.01%, S: <0.01%, Ti: 0.05% to 0.09%, and the rest is Fe and unavoidable impurities; and / or

[0015] The substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the yield strength of the substrate is 170 MPa to 190 MPa; and / or

[0016] The substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the loading amount of the zinc-containing layer is greater than 100 g / ㎡; and / or

[0017] The surface roughness of the substrate is 0.6 μm to 1 μm.

[0018] As an optional implementation, before performing the first coating, the method further comprises: performing skin pass rolling on the substrate, wherein the rolling force of the skin pass rolling is 900KN to 1100KN; and / or

[0019] Before performing the first coating, the method further includes: performing edge trimming on the substrate.

[0020] As an optional embodiment, the method also includes: coiling the double-sided textured color-coated plate, the unit tension of the coiling is 30MPa~36MPa, the coiling temperature does not exceed 40°C, the timing of coiling is: the weight of a single coil is ≤4t, and after the coiling, the side-lying storage time of a single coil does not exceed 1 hour.

[0021] In a second aspect, the present application provides a double-sided textured color-coated plate, which is prepared by the method provided in the first aspect.

[0022] The above technical solution provided by the embodiment of the present application has the following advantages compared with the prior art:

[0023] The method provided in the embodiment of the present application adopts spray cooling with a spray pressure of 6.5 bar to 7.5 bar. The larger spray pressure can make the coolant have a better atomization effect, and can reduce the use of coolant while achieving a better cooling effect, thereby reducing the residual coolant, improving the risk of water on the surface, and solving the problem that double-sided textured color-coated plates cannot be produced at present. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0025] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, for ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.

[0026] Figure 1 A flowchart of the method provided in the embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0028] Unless otherwise specified, various raw materials, reagents, instruments and equipment used in this application can be purchased from the market or prepared by existing methods.

[0029] However, the current preparation method for single-sided textured color-coated plates still has the risk of surface water, which makes it impossible to produce smoothly. The reason is that the textured coating has a "honeycomb"-like texture effect on its surface, which makes it impossible for the squeeze roller to fit the surface of the textured plate to fully squeeze out the cooling water. Therefore, the production line of conventional textured color-coated plates only relies on water cooling on the non-textured surface to cool the product, but this function cannot be achieved when both sides are textured.

[0030] To this end, the present application intends to provide a production control method for a deep-drawing grade substrate double-sided textured color-coated plate. In the galvanizing process, the yield strength of the deep-drawing grade color-coated substrate is modulated and the edge thickness is controlled. At the same time, the following adjustments and controls are mainly performed in the preparation process: First, the parameters of the coating roller pressure are set within the range of 150±10kg in the second coating process to ensure that there will be no defects caused by the accumulation of the coating on the edges; second, in the second curing process, the air volume and temperature of the upper and lower drying bellows of the baking furnace are standardized and controlled to reduce the problems of poor plate shape and incomplete cooling caused by overburning of the material; third, the second cooling stage after baking is adjusted. Adjustment, increase the spray pressure of spray cooling to 7±0.5bar, close the water cooling flow of the current process spray section, increase the temperature of the strip temperature monitoring at the outlet of the water cooling section, and set up an air cooling device on the subsequent channel line for air cooling to meet the surface cooling of the strip and the elimination of residual water on the surface of the checkered plate; Fourth, increase the unit winding tension to about 33Mpa during the coiling process, and add a paper sleeve of 30mm or more thickness inside the steel coil to ensure that the steel coil will not collapse after it goes offline; Fifth, in the transportation and reverse transportation of double-sided checkered color-coated plates, the steel coil is packaged vertically to reduce other defects caused during transportation. Finally, a double-sided checkered color-coated plate with a primer layer of 5 to 6 microns and a topcoat layer of 17 to 19 microns is achieved on both the front and back sides.

[0031] Figure 1 A flow chart of the method provided in the embodiment of the present application is as follows: Figure 1 As shown, the embodiment of the present application provides a method for preparing a double-sided textured color-coated plate, the method comprising:

[0032] S1. Obtain a substrate;

[0033] Choose suitable substrate materials, such as cold-rolled sheet, galvanized sheet, etc. The substrate can be pre-treated, such as cleaning and rust removal, to ensure good bonding between the coating and the substrate.

[0034] In some embodiments, the substrate includes a steel base layer and a zinc-containing layer attached to the steel base layer, and the chemical composition of the substrate includes, by mass fraction: C: <0.003%, Si: <0.03%, Mn: 0.11%~0.15%, P: <0.01%, S: <0.01%, Ti: 0.05%~0.09%, and the rest is Fe and unavoidable impurities.

[0035] In some embodiments, the substrate includes a steel base layer and a zinc-containing layer attached to the steel base layer, and the yield strength of the substrate is 170 MPa to 190 MPa.

[0036] In some embodiments, the substrate includes a steel base layer and a zinc-containing layer attached to the steel base layer, and the loading amount of the zinc-containing layer is greater than 100 g / ㎡; the surface roughness of the substrate is 0.6 μm to 1 μm.

[0037] In this embodiment, the process of obtaining the substrate is to obtain the original strip steel, and the mass percent chemical composition of the original strip steel is: C: <0.003%, Si: <0.03%, Mn: 0.11%~0.15%, P: <0.01%, S: <0.01%, Ti: 0.05%~0.09%, and the rest is Fe and residual elements. The original strip steel is annealed, and the annealing temperature is 810±10℃, and the yield strength after annealing is controlled to be between 170Mpa~190Mpa. In order to make the color-coated plate meet the higher level of anti-corrosion control requirements, the thickness of the zinc-containing layer of the substrate is more than 100g / ㎡, and the surface roughness is controlled at 0.8μm±0.2μm. In the skin-pass rolling process of the galvanizing process, the edge drop control method is adopted, and the rolling force is selected to be 1000±100KN. As a deep-drawing grade color-coated substrate, it is required to perform edge trimming control in the acid rolling process.

[0038] S2. performing a first coating, a first curing and a first cooling on both surfaces of the substrate to obtain an intermediate coating substrate;

[0039] The first layer of coating is applied on both surfaces of the substrate. The type of coating can be selected according to specific needs, such as polyester, fluorocarbon, etc. The coated substrate is cured to make the coating and the substrate closely bonded. The cured substrate is cooled to prepare for subsequent coating operations.

[0040] The first coating line speed is 50m / min, and no coating filter bag is used. The coating process parameters and control requirements are shown in the following table:

[0041]

[0042] The first curing process parameters and control requirements, the oven temperature of each section of the baking oven and the coating PMT control range are shown in the following table:

[0043]

[0044] The equipment used in the first cooling is the same as the existing process equipment, which is equipped with a spray section and a shower section. The spray section is a pipe network desalted water directly supplied to 8 spray beams and 48 nozzles, and the spray pressure of each nozzle is 4±0.5bar; the shower section is a water tank and a water pump self-circulation mode to supply 9 spray beams and 54 nozzles, and the spray parameter of each nozzle is: 3±0.5bar.

[0045] S3. Perform a second coating, a second curing and a second cooling on both surfaces of the intermediate coating substrate to obtain a double-sided color-coated plate.

[0046] The second layer of coating is applied on both surfaces of the intermediate coating substrate, and the coating forms a reticulated effect. The coated substrate is solidified again. The second cooling is performed, which is a key step in preparing double-sided reticulated color-coated panels.

[0047] In some embodiments, the second cooling includes spray cooling, and the spray pressure of the spray cooling is 6.5 bar to 7.5 bar. By adopting spray cooling with a spray pressure of 6.5 bar to 7.5 bar, the larger spray pressure can make the coolant have a better atomization effect, and can reduce the use of coolant while achieving a better cooling effect, thereby reducing the residual coolant and improving the risk of surface water. The advantages of spray cooling include: 1. Good atomization effect of coolant: The larger spray pressure can fully atomize the coolant to form fine droplets. 2. High cooling efficiency: The atomized coolant can quickly contact the surface of the substrate and take away heat to achieve rapid cooling. 3. Reduce coolant residue: Since the coolant is fully atomized, the amount of coolant residue can be reduced during use. 4. Improve the risk of surface water: Reducing coolant residue helps reduce the risk of surface water, thereby improving the surface quality of the color-coated plate.

[0048] In this embodiment, the spray cooling of the second cooling uses the same cooling equipment as the first cooling, but the spray section is not turned on during the use process.

[0049] In some embodiments, the second cooling further includes air cooling, and the air pressure of the air cooling is ≥361 Pa. In this embodiment, 5 axial flow fans are prepared, and the fan selection parameters are recommended to have power ≥4Kw, air pressure ≥361Pa, and rotation speed ≥1450r / min, so as to ensure that the residual water on the surface of the intermediate coating substrate can be air cooled within a range of 5 meters, and the spray cooling outlet section and the left and right sides of the outlet looper are placed respectively.

[0050] In some embodiments, in order to verify the safety and stability of the above measures, it is necessary to use a contact temperature measuring device to measure the temperature of the substrate after mist cooling at the exit section of the fine coating water quenching, and the temperature of the substrate at the end of the spray cooling is required to be ≤70°C. At the same time, before the exit quality inspection platform, the residual water on the surface of the substrate is monitored, and it is required that no residual water is allowed on the surface of the substrate.

[0051] In some embodiments, the substrate adopts a high-volume operation mode at the exit looper at the end of the spray cooling, and the volume of the high-volume operation mode is 45% to 55%. That is, the exit section running speed is controlled, and when the exit looper is pulled to about 50%, the exit running speed is actively reduced.

[0052] In some embodiments, the coating roller pressure of the second coating is 140 kg to 160 kg.

[0053] In this embodiment, the second coating line speed is 50m / min, and no coating filter bag is used. The coating process parameters and control requirements are shown in the following table:

[0054]

[0055] In some embodiments, the second curing includes 5 stages of baking, wherein the first stage baking temperature is 175°C to 185°C, the second stage baking temperature is 195°C to 205°C, the third stage baking temperature is 220°C to 230°C, the fourth stage baking temperature is 240°C to 250°C, and the fifth stage baking temperature is 270°C to 280°C.

[0056] In some embodiments, during the second curing process, the plate temperature PMT of the intermediate coating substrate is 224° C. to 232° C.

[0057] In this embodiment, the second curing process parameters and control requirements, the control range of the furnace temperature of each section of the baking furnace and the coating PMT are shown in the following table:

[0058] Unit: ℃ 1 stage temperature 2 temperature levels 3 temperature levels 4 temperature levels 5 temperature levels PMT 180±5 200±5 225±5 245±5 275±5 224～232

[0059] Unlike the traditional single-sided textured color-coated plate, the double-sided textured color-coated plate described in the present invention has its surface "honeycomb" grid structure contact area reduced exponentially after coiling. Under the same coiling tension, it is more likely to have interlayer displacement, and the risk of coil collapse or paint peeling due to friction of the color-coated plate increases exponentially. Therefore, the following adjustments are made to the coiling process:

[0060] (1) Different from ordinary coated products, the unit tension of winding needs to be increased to about 33Mpa.

[0061] (2) Use a 30mm thick paper sleeve, and the sleeve overflow end cannot be at the lower end after rolling. (According to the flipping direction of the roll-up machine, ensure that the sleeve overflow direction is on the transmission side of the outlet); or use a steel sleeve with a thickness of not less than 6mm.

[0062] (3) The coiling temperature shall not exceed 40°C.

[0063] (4) Subject to the user's roll division conditions, the rolls are divided according to the minimum tonnage, which is generally set at ≤4 tons.

[0064] When transporting double-sided color coated steel coils, pay attention to the following points in the packaging and transportation process:

[0065] (1) After the finished steel coil is off the line, when it is transported to the steel coil saddle by the coil transport trolley, the steel coil is tied with one circumferential strap in the middle and one radial strap at the tongue position of the outermost circle of the steel coil to avoid inter-layer displacement during the steel coil hoisting process.

[0066] (2) Before packaging, check whether the steel coil has any oval deformation and whether the paper sleeve has any cracks. Pay attention to the entire process of lifting the steel coil to the packaging area to see if there is any coil collapse.

[0067] (3) It is recommended that the steel coils be transported in vertical packaging, and the finished steel coils must be packaged and erected immediately after they come off the production line; horizontal storage for more than 1 hour is generally not allowed. If horizontal packaging is used, a steel sleeve with a thickness of not less than 6 mm should be used.

[0068] Based on a general inventive concept, an embodiment of the present application further provides a double-sided textured color-coated plate, which is prepared by the method provided above.

[0069] Double-sided color coated sheet has a wide range of applications due to its unique appearance and excellent performance. For example, it can be used in building exterior wall decoration, interior decoration, home appliance housing and other fields. As people's requirements for environmental protection and aesthetics continue to increase, the market demand for double-sided color coated sheet will continue to grow. The double-sided color coated sheet is prepared based on the above method. The specific steps of the method can refer to the above embodiment. Since the double-sided color coated sheet adopts part or all of the technical solutions of the above embodiment, it at least has all the beneficial effects brought by the technical solutions of the above embodiment, which will not be repeated here.

[0070] The present application will be further described below in conjunction with specific embodiments. It should be understood that these embodiments are intended only to illustrate the present application and are not intended to limit the scope of the present application. The experimental methods for which specific conditions are not specified in the following examples are usually measured according to national standards. If there is no corresponding national standard, then the conditions recommended by the manufacturer are followed.

[0071] Example 1

[0072] A double-sided color-coated plate, the preparation process of which is as follows:

[0073] S1. Obtain the substrate; the process of obtaining the substrate is to obtain the original strip steel, the mass percent chemical composition of the original strip steel is: C: <0.002%, Si: 0.01%, Mn: 0.13%, P: <0.01%, S: <0.01%, Ti: 0.07%, and the rest is Fe and residual elements. The original strip steel is annealed at 810±10℃, and the yield strength after annealing is controlled to be 180Mpa. The thickness of the zinc-containing layer of the substrate is 110g / ㎡, and the surface roughness is controlled at 0.8μm. During the skin-pass rolling process of the galvanizing process, the edge drop control method is adopted, and the rolling force is selected to be 1000KN. As a deep-drawing grade color-coated substrate, it is required to perform edge trimming control during the acid rolling process.

[0074] S2. Coating is performed on both surfaces of the substrate to obtain a double-sided color-coated plate.

[0075] The parameters of coating preparation are controlled as follows:

[0076] Parameter control of coating process:

[0077] Line speed 50m / min, no paint filter bag is used. Coating process parameters and control requirements are shown in the following table:

[0078]

[0079] Parameter control of curing process:

[0080]

[0081] Parameter control of cooling process:

[0082] The first cooling is equipped with a spray section and a shower section. The spray section is a pipe network desalted water directly supplied to 8 spray beams and 48 nozzles, and the spray pressure of each nozzle is 4±0.5bar; the shower section is a water tank and a water pump self-circulation mode to supply 9 spray beams and 54 nozzles, and the spray parameter of each nozzle is: 3±0.5bar.

[0083] The spray cooling of the second cooling uses the same cooling equipment as the first cooling, but the spray section is not turned on during use. The spray pressure of the spray cooling is 6.5bar~7.5bar. Five axial flow fans are prepared, and the fan selection parameters are recommended. The power is ≥4Kw, the wind pressure is ≥361Pa, and the speed is ≥1450r / min. They are placed on the left and right sides of the spray cooling outlet section and the outlet looper for air cooling.

[0084] Comparative Example 1

[0085] A double-sided color-coated plate, the preparation process of which is as follows:

[0086] S1. Obtain the substrate; the process of obtaining the substrate is to obtain the original strip steel, the mass percent chemical composition of the original strip steel is: C: <0.002%, Si: 0.01%, Mn: 0.13%, P: <0.01%, S: <0.01%, Ti: 0.07%, and the rest is Fe and residual elements. The original strip steel is annealed at 810±10℃, and the yield strength after annealing is controlled to be 180Mpa. The thickness of the zinc-containing layer of the substrate is 110g / ㎡, and the surface roughness is controlled at 0.8μm. During the skin-pass rolling process of the galvanizing process, the edge drop control method is adopted, and the rolling force is selected to be 1000KN. As a deep-drawing grade color-coated substrate, it is required to perform edge trimming control during the acid rolling process.

[0087] S2. Coating is performed on both surfaces of the substrate to obtain a double-sided color-coated plate.

[0088] The parameters of coating preparation are controlled as follows:

[0089] Parameter control of coating process:

[0090] Line speed 50m / min, no paint filter bag is used. Coating process parameters and control requirements are shown in the following table:

[0091]

[0092] Parameter control of curing process:

[0093]

[0094] Parameter control of cooling process:

[0095] The first cooling and second cooling are respectively provided with a spray section and a shower section. The spray section is a pipe network desalted water direct supply of 8 spray beams and 48 nozzles, and the spray pressure of each nozzle is 4±0.5bar; the shower section is a water tank and a water pump self-circulation mode supply of 9 spray beams and 54 nozzles, and the spray parameter of each nozzle is: 3±0.5bar.

[0096] The preparation conditions of Example 1 and Comparative Example 1 are as follows:

[0097] Is production going smoothly? Example 1 yes Comparative Example 1 no

[0098] It can be seen from the above table that the method provided in the embodiment of the present application can successfully produce a double-sided textured color-coated plate.

[0099] Various embodiments of the present application may be presented in the form of a range; it should be understood that the description in the form of a range is only for convenience and brevity, and should not be understood as a rigid limitation on the scope of the present application; therefore, the range description should be considered to have specifically disclosed all possible sub-ranges and single numerical values ​​within the range. For example, the range description from 1 to 6 should be considered to have specifically disclosed sub-ranges, such as from 1 to 3, from 1 to 4, from 1 to 5, from 2 to 4, from 2 to 6, from 3 to 6, etc., as well as single numbers within the range, such as 1, 2, 3, 4, 5 and 6, which apply regardless of the range. In addition, whenever a numerical range is indicated herein, it is meant to include any cited number (fractional or integer) within the indicated range.

[0100] In the present application, in the absence of any contrary description, the directional words used, such as "upper" and "lower", are specifically the directions of the drawings in the accompanying drawings. In addition, in the description of the present specification, the terms "including", "comprising", etc. refer to "including but not limited to". In this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply that there is any such actual relationship or order between these entities or operations. In this article, "and / or" describes the association relationship of the associated objects, indicating that there may be three relationships, for example, A and / or B, which can represent: A exists alone, A and B exist at the same time, and B exists alone. Wherein A, B can be singular or plural. In this article, "at least one" refers to one or more, and "plural" refers to two or more. "At least one", "at least one of the following" or similar expressions refer to any combination of these items, including any combination of singular or plural items. For example, "at least one of a, b or c", or "at least one of a, b and c", can both mean: a, b, c, ab (i.e. a and b), ac, bc, or abc, where a, b and c can be single or multiple.

[0101] The above description is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to the embodiments shown herein, but will conform to the widest range consistent with the principles and novel features applied for herein.

Claims

1. A method for preparing a double-sided color-coated plate, characterized in that: The method comprises: obtaining a substrate; Performing a first coating, a first curing and a first cooling on both surfaces of the substrate to obtain an intermediate coating substrate; The two surfaces of the intermediate coating substrate are subjected to a second coating, a second curing and a second cooling to obtain a double-sided textured color coated plate, wherein the second cooling includes spray cooling, and the spray pressure of the spray cooling is 6.5 bar to 7.5 bar.

2. The method for preparing a double-sided textured color-coated plate according to claim 1, characterized in that: The second cooling also includes air cooling, and the wind pressure of the air cooling is ≥361Pa.

3. The method for preparing a double-sided textured color-coated plate according to claim 1, characterized in that: The temperature of the substrate at the end point of the spray cooling is ≤70°C.

4. The method for preparing a double-sided textured color-coated plate according to claim 1, characterized in that: The exit looper of the substrate at the end point of the spray cooling adopts a high-looping operation mode, and the looping amount of the high-looping operation mode is 45% to 55%.

5. The method for preparing a double-sided textured color-coated plate according to any one of claims 1 to 4, characterized in that: The coating roller pressure of the second coating is 140kg-160kg.

6. The method for preparing a double-sided color coated plate according to any one of claims 1 to 4, characterized in that: The second curing comprises five stages of baking, wherein the first stage of baking is at a temperature of 175°C to 185°C, the second stage of baking is at a temperature of 195°C to 205°C, the third stage of baking is at a temperature of 220°C to 230°C, the fourth stage of baking is at a temperature of 240°C to 250°C, and the fifth stage of baking is at a temperature of 270°C to 280°C; and / or During the second curing process, the plate temperature PMT of the intermediate coating substrate is 224°C to 232°C.

7. The method for preparing a double-sided textured color-coated plate according to any one of claims 1 to 4, characterized in that: The substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the chemical composition of the substrate comprises, by mass fraction: C: <0.003%, Si: <0.03%, Mn: 0.11% to 0.15%, P: <0.01%, S: <0.01%, Ti: 0.05% to 0.09%, and the rest is Fe and unavoidable impurities; and / or The substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the yield strength of the substrate is 170 MPa to 190 MPa; and / or The substrate comprises a steel base layer and a zinc-containing layer attached to the steel base layer, and the loading amount of the zinc-containing layer is greater than 100 g / ㎡; and / or The surface roughness of the substrate is 0.6 μm to 1 μm.

8. The method for preparing a double-sided textured color-coated plate according to any one of claims 1 to 4, characterized in that: Before performing the first coating, the method further comprises: performing skin pass rolling on the substrate, wherein the rolling force of the skin pass rolling is 900KN to 1100KN; and / or Before performing the first coating, the method further includes: performing edge trimming on the substrate.

9. The method for preparing a double-sided textured color-coated plate according to any one of claims 1 to 4, characterized in that: The method further comprises: coiling the double-sided textured color coated plate, the unit tension of the coiling being 30MPa to 36MPa, the temperature of the coiling not exceeding 40°C, the timing of coiling: the mass of a single coil is ≤4t, and after the coiling, the side-lying storage time of a single coil does not exceed 1 hour.

10. A double-sided color coated plate, characterized in that: The double-sided textured color-coated plate is prepared by the methods described in claims 1 to 9.

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