Production line for double-sided spraying and double-sided hot laminating of metal coiled material and production method thereof

Abstract

The invention discloses a production line for double-sided spraying and double-sided hot film coating of a metal coiled material and a production method of the production line. The production line comprises an uncoiling device, a cleaning and passivating device, an electrostatic powder spraying device, a curing device, a hot film coating device, a protective film coating device and a coiling device which are arranged in sequence. The structure of a traditional hot laminating device is changed, the double film releasing mechanisms are arranged, single-face hot laminating production of a traditional single hot laminating device is converted into double-face hot laminating production of a single hot laminating device at the same time, the investment of the hot laminating device is reduced, meanwhile, heating of the hot laminating device is omitted, and the production efficiency is improved. After the hot laminating device is arranged in the drying oven, the heating temperature requirements of metal coil spraying curing and hot laminating are met through heat of the curing drying oven, one-line multiple purposes of metal coil spraying and hot laminating production are achieved, the investment of heating equipment is reduced, and the production efficiency is improved. The beneficial effects of reducing the production cost, saving energy consumption resources, reducing pollution, improving the surface quality of the metal coiled material and the like are achieved.

Description

Technical Field

[0001] The present invention belongs to the technical field of metal coil production, and more specifically relates to a production technology field for double-sided spraying and double-sided hot lamination of metal coils, in particular to a production line and a production method thereof for double-sided spraying and double-sided hot lamination of metal coils. Background Art

[0002] Spraying or hot lamination of metal coils refers to spraying or laminating various powder coatings or polymer composite films on the surface of metal coils. Since it is a coil that has been coated or hot-laminated in a metallurgical factory and can be directly processed into products by users, it is also called pre-coated coil. It has the good strength and processing properties of metal materials, and also has the excellent decorative properties, corrosion resistance, weather resistance, and pollution resistance of polymer films. Therefore, it is widely used in manufacturing industries such as construction, home appliances, and steel structures, and has good development prospects.

[0003] In the continuous production of metal coils by spraying or hot lamination, separate production lines are generally set up according to different applications of the coils. Generally, there is commonality in the surface processing production of metal coils. For example, different surface processing methods, such as spraying and hot lamination, are generally divided into different spraying devices and hot lamination devices in production. However, the current traditional spraying and hot lamination production lines are designed separately, and are generally single-sided spraying or single-sided hot lamination settings. There are almost no production lines that carry out spraying or hot lamination at the same time, or even double-sided spraying and double-sided hot lamination at the same time on the same production line. At present, traditional thermal laminating machines generally heat the laminating roller, and the heat on the roller surface is transferred to the hot melt adhesive through the polymer film layer. The roller surface temperature must be much higher than the melting point of the hot melt adhesive. If the roller surface temperature is too low, the hot melt adhesive will not melt completely and will not be firmly bonded. The roller surface temperature must reach above 150 degrees to allow the hot melt adhesive to melt completely. At this time, the polymer film also softens and deforms due to high temperature. After lamination, the polymer film on the surface of the plate will produce orange peel and other undesirable phenomena, and a thermal laminating machine can only meet the needs of single-sided thermal lamination. Therefore, in order to meet the diversified surface processing needs of metal coils and reduce the investment cost of production lines, a double-sided spraying and double-sided thermal laminating production line for metal coils is developed, the production equipment and production methods of spraying and thermal laminating machines are optimized, and a double-sided spraying and double-sided thermal laminating production line and production method are developed to meet multiple needs on one line, reduce equipment investment, save energy consumption, and improve the surface processing quality of metal coils. Summary of the invention

[0004] In order to solve the above production problems and overcome the defects of the prior art, one of the purposes of the present invention is to provide a production line for double-sided spraying and double-sided hot lamination of metal coils, which can be applied to the surface processing production of continuous double-sided spraying and double-sided hot lamination of metal coils.

[0005] The invention discloses a production line for double-sided spraying and double-sided hot laminating of metal coils, comprising an unwinding device, a cleaning and passivation device, an electrostatic powder spraying device, a curing device, a hot laminating device, a protective film laminating device and a winding device which are arranged in sequence; The unwinding device comprises an unwinding machine A, an inlet shear, an unwinding machine B, a clamping machine, a sewing machine, a deburring machine, a first tension machine and an inlet looper connected in sequence, wherein two unwinding machines are provided, one for standby and the other for use; The cleaning and passivation device comprises a second tension machine, an alkali cleaning device, a water washing device, a passivation device, a passivation drying device and a first deviation correcting machine connected in sequence; The electrostatic powder spraying device comprises a third tension machine, a front electrostatic powder spraying device, and a back electrostatic powder spraying device; The curing device comprises a front infrared curing device, a back infrared curing device, an oven, an air cooling device and a water cooling roller; The thermal laminating device comprises a coating machine, a thermal laminating machine, a water cooling device, a second deviation correcting machine and a fourth tension machine, wherein the thermal laminating machine is arranged after the oven; The protective film coating device comprises a third deviation correcting machine, a sixth tension machine, and a connected protective film coating machine and a laminating machine, wherein the laminating machine is arranged after the protective film coating machine; The winding device includes a fifth tension machine, an exit looper, a bridge roller, an exit shear and a winding machine, wherein the exit looper is connected to the third deviation correcting machine, and the winding machine is used to wind the finished metal coil into a coil.

[0006] The layout of the production line is a multi-layer zigzag layout, the unwinding device and the winding device are arranged on the same horizontal line front and back, the entrance looper and the exit looper are arranged side by side at the same end, the entrance looper is connected to the first tension machine and the second tension machine front and back respectively, the exit looper is connected to the fifth tension machine and the third deviation correcting machine front and back respectively, the hot laminating machine is arranged at the outlet of the oven, and is connected to a water cooling device at the rear, the back electrostatic spraying device and the front electrostatic spraying device are arranged in a zigzag direction, and are each connected to an infrared curing device at the rear to ensure seamless switching of the production line between double-sided spraying and double-sided hot laminating production operations, the protective film coating device is arranged before the winding device to protect the surface of the metal coil after spraying or hot lamination from secondary pollution and damage.

[0007] The cleaning and passivation device is directly connected to the electrostatic powder spraying device through the first deviation correcting machine and the third tension machine. The electrostatic powder spraying device is connected to the coating machine, the curing device, and the thermal laminating device in sequence. The curing device is arranged between the electrostatic powder spraying device and the thermal laminating device, and can be used as a double-sided spray curing device and a double-sided thermal laminating heating device, respectively.

[0008] The alkaline washing device and the water washing device respectively include alkaline solution soaking and brushing and clean water brushing and soaking, ensuring that grease residues and residual alkaline solution are washed off the surface of the metal coil, which is convenient for surface spraying and hot lamination processing of the metal coil.

[0009] The coating machine is respectively provided with a back-side material belt roller and a back-side coating roller as well as a front-side material belt roller and a front-side coating roller, so as to facilitate double-sided gluing and hot lamination of metal coils.

[0010] The hot laminating machine is provided with a frame, an upper laminating roller and a lower laminating roller are provided on the frame, a supporting roller is provided on one side of the frame, a front film placing mechanism is provided on the upper side, a back film placing structure is provided on the lower side, a front flattening roller is provided on the upper right side, and a back flattening roller is provided on the lower right side. The metal coil is supported by the supporting roller and passes between the upper laminating roller and the lower laminating roller. The front and back film placing mechanisms are respectively provided with two rollers for installing and connecting the front film and the new film. The polymer film roller is installed on the roller, the polymer film rotates through the roller of the film placing mechanism, and then is flattened respectively by the front flattening roller and the back flattening roller, and is pressed on the front and back sides of the metal coil by the upper laminating roller and the lower laminating roller; wherein, a lifting cylinder is provided above the upper laminating roller and the lower laminating roller, and the lifting cylinder is fixedly installed on the frame, and its piston rod is connected with the upper laminating roller and the lower laminating roller, so that the upper laminating roller and the lower laminating roller can realize up and down movement, which is convenient for the laminating and laminating of the metal coil.

[0011] The production method for double-sided spraying and double-sided hot lamination of metal coils adopts the above-mentioned production line for double-sided spraying and double-sided hot lamination of metal coils, and the production method for double-sided spraying and double-sided hot lamination of metal coils includes the following steps: sequentially through uncoiler A→entrance shear→uncoiler B→clamping machine→sewing machine→burring machine→first tension machine→entrance looper→second tension machine→alkali solution immersion→alkali solution brushing→clean water brushing→clean water immersion→passivation device→passivation drying device→first correcting machine→third tension machine→back electrostatic powder spraying device→back infrared curing device→air cooling device→water cooling roller→coating machine→front electrostatic powder spraying device→front infrared curing device→oven→hot laminating machine→water cooling device→second correcting machine→fourth tension machine→fifth tension machine→exit looper→third correcting machine→sixth tension machine→protective film laminating machine→film laminating machine→exit shear→bridge roller→winding machine.

[0012] When the production line is used for double-sided spraying of metal coils, the coating machine and the hot laminating machine are not loaded and operated, and are only used for production line transportation. When the production line is used for double-sided hot laminating of metal coils, the back electrostatic powder spraying device, infrared curing device, air cooling device, water-cooling roller, and front electrostatic powder spraying device are not loaded and operated, and are only used for production line transportation.

[0013] The oven temperatures are 230-280° C. and 150-250° C. during the production of double-sided spraying and double-sided thermal lamination of metal coils, respectively, and the line speed of the production line is 20-80 m / min.

[0014] The advantages of the present invention are: (1) The present invention changes the structural setting of the traditional thermal laminating machine. By setting up a double film-releasing mechanism, the traditional single thermal laminating equipment for single-sided thermal laminating is converted into a single thermal laminating equipment for simultaneous double-sided thermal laminating, thereby reducing the investment in thermal laminating equipment and eliminating the roller heating setting of the thermal laminating device. The metal coil is heated by an oven instead of the traditional roller heating of the polymer film, so that the glue coating and leveling on the surface of the metal coil are more uniform, the surface temperature is more uniform, the fit and utilization rate of the thermal laminating are improved, and the surface processing quality and production efficiency of the thermal laminating are improved.

[0015] (2) The present invention changes the traditional double-sided spraying and double-sided hot laminating production line settings and production methods, maximizes the resources of the electrostatic powder spraying device, the curing device and the hot laminating device, and utilizes the heat of the oven to meet the heating temperature requirements of the metal coil spraying curing and hot laminating, thereby achieving the multi-use of one line for metal coil spraying and hot laminating production, reducing the investment in heating equipment, and achieving the beneficial effects of reducing production costs, saving energy resources, and reducing environmental pollution. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 It is a schematic diagram of the layout of a production line for double-sided spraying and double-sided hot lamination of metal coils according to the present invention.

[0017] Figure 2 It is a schematic diagram of a production line for double-sided spraying and double-sided hot lamination of metal coils according to the present invention.

[0018] Figure 3 It is a structural schematic diagram of the hot laminating machine of the present invention.

[0019] Figure 4 It is a schematic diagram of the coating machine mechanism of the present invention.

[0020] Description of reference numerals: 1. Unwinding device, 2. Cleaning and passivation device, 3. Electrostatic powder spraying device, 4. Curing device, 5. Thermal laminating device, 6. Protective film laminating device, 7. Winding device; 101A. Uncoiler, 101B. Uncoiler B, 102. Entry shear, 103. Clamping machine, 104. Sewing machine, 105. Deburring machine, 106. First tension machine, 107. Entry looper, 201. Second tension machine, 202. Alkaline washing device, 203. Water washing device, 204. Passivation device, 205. Passivation drying device, 206. First deviation correcting machine, 301. Third tension machine, 302. Back electrostatic powder spraying device, 303. Front electrostatic powder spraying device, 401 .Back infrared curing device, 402. Front infrared curing device, 403. Oven, 404. Air cooling device, 405. Water cooling roller, 501. Hot laminating machine, 502. Water cooling device, 503. Second deviation correcting machine, 504. Fourth tension machine, 505. Coating machine, 601. Third deviation correcting machine, 602. Sixth tension machine, 603. Protective film laminating machine, 604 Laminating machine, 701. Fifth tension machine, 702. Export looper, 703. Export shear, 704. Bridge roller, 705. Winding machine; 2021. Alkali solution soaking, 2022. Alkali solution brushing, 2031. Clean water brushing, 2032. Clean water soaking, 5011 Front film placing mechanism, 5012. Back film placing mechanism, 5013. Upper film coating roller, 5014. Lower film coating roller, 5015. Front flattening roller, 5016. Back flattening roller, 5017. Support roller, 5018, lifting cylinder, 5019. Frame, 5020. Magnetic powder brake, 5021. Roller, 5051. Front coating roller, 5052. Back coating roller, 5053. Back belt roller, 5054. Front belt roller. DETAILED DESCRIPTION

[0021] The production line for double-sided spraying and double-sided hot lamination of metal coils of the present invention will be further described below in conjunction with the accompanying drawings.

[0022] To realize the production line production of the production line for double-sided spraying and double-sided thermal lamination of metal coils described in the present invention, see Figures 1 to 4 .

[0023] like Figure 1 and Figure 2As shown, the production line for double-sided spraying and double-sided hot laminating of metal coils comprises an unwinding device 1, a cleaning and passivation device 2, an electrostatic powder spraying device 3, a curing device 4, a hot laminating device 5, a protective film laminating device 6 and a winding device 7 which are arranged in sequence; the unwinding device 1 comprises an unwinding machine A 101A, an inlet shear 102, an unwinding machine B 103 and an inlet shear 104 which are connected in sequence. 101B, a clamping machine 103, a stitching machine 104, a burr pressing machine 105, a first tension machine 106 and an inlet looper 107, wherein two unwinders are provided, one for standby and the other for use; the cleaning and passivation device 2 comprises a second tension machine 201, an alkali cleaning device 202, a water washing device 203, a passivation device 204, a passivation drying device 205 and a first deviation correcting machine 206 connected in sequence; the electrostatic powder spraying device 3 comprises a third tension machine 301, a front electrostatic powder spraying device 303, and a back electrostatic powder spraying device 302; the curing device 4 comprises a front infrared curing device 402, a back infrared curing device 401, an oven 403, an air cooling device 404 and a water cooling roller 405; the hot laminating device The film device 5 includes a coating machine 505, a hot laminating machine 501, a water cooling device 502, a second deflection correcting machine 503 and a fourth tensioning machine 504, wherein the hot laminating machine 501 is arranged after the oven 403; the protective film coating device 6 includes a third deflection correcting machine 601, a sixth tensioning machine 602 and a connected protective film coating machine 603 and a laminating machine 604, wherein the laminating machine 604 is arranged after the protective film coating machine 603; the winding device 7 includes a fifth tensioning machine 701, an exit looper 702, a bridge roller 704, an exit shear 703 and a winding machine 705, wherein the exit looper 702 is connected to the third deflection correcting machine 601, and the winding machine 705 is used to roll the finished metal coil into a coil.

[0024] It should be noted that, in the present invention, it is different from the production line of single double-sided spraying and single double-sided thermal lamination. Figure 1 and Figure 2The production line layout shown is a multi-layer circular layout, the unwinding device 1 and the winding device 7 are arranged on the same horizontal line front and back, the inlet looper 107 and the outlet looper 702 are arranged side by side at the same end, and the metal coil is transported across multiple layers of buffer, which saves the equipment floor space and facilitates the speed regulation of the production line. The inlet looper 107 is connected to the first tension machine 106 and the second tension machine 201 front and back respectively, which are used to balance the required tension between the inlet looper 107 and the front-end unwinding equipment and the rear-end cleaning equipment. The outlet looper 702 is connected to the fifth tension machine 701 and the third deviation correcting machine 601 front and back respectively, which are used to provide the required tension between the outlet looper 702 and the curing device 4 and correct the deviated coil, and enter the winding device 7 in the center. The hot laminating machine 501 is arranged at the outlet of the oven 403 to ensure the surface temperature of the metal coil and facilitate the hot laminating machine 501. The hot coating lamination operation is carried out, and then a water cooling device 502 is connected. The water cooling device 502 is provided with two groups of water cooling rollers and an external water cooling section circulation system for cooling the surface temperature of the hot coated metal coil. The back electrostatic spraying device 302 and the front electrostatic spraying device 303 are arranged in a circular shape to meet the requirements of double-sided spraying of the production line, reduce complex conversion equipment and complex conversion operations, avoid operating errors, shorten the length of the production line, and reduce the floor space of the production line. An infrared curing device is connected at the back to ensure that the metal coil spray powder is instantly leveled and cured, reduce the loss of powder coating spraying, and ensure seamless switching of the production line between double-sided spraying and double-sided hot coating production operations. The protective film covering device 6 is arranged before the winding device 7, mainly to cover the surface of the metal coil finished product with a layer of protective film to protect the surface of the metal coil after spraying or hot coating from secondary pollution and damage.

[0025] Further, such as Figure 2 The cleaning and passivation device 2 is directly connected to the electrostatic powder spraying device 3 through the first deviation correcting machine 106 and the third tension machine 301. The electrostatic powder spraying device 3 is connected to the coating machine 505, the curing device 4, and the thermal laminating device 5 in sequence. The curing device 4 is arranged between the electrostatic powder spraying device 3 and the thermal laminating device 5. The temperature parameters of the oven 403 can be controlled to be used as a double-sided spray curing device and a double-sided thermal laminating heating device, respectively, simplifying the thermal laminating machine 501 equipment and saving energy consumption. The alkali washing device 202 and the water washing device 203 respectively include alkali solution soaking 2021 and brushing and clean water brushing 2031 and soaking. The surface cleaning is carried out according to the surface treatment procedures of alkali solution soaking 2021, alkali solution brushing 2022, clean water brushing 2031, and clean water soaking 2032 in sequence, ensuring that the grease residue and residual alkali solution on the surface of the metal coil are washed away, which is convenient for the surface spraying and thermal laminating processing of the metal coil.

[0026] like Figure 3As shown, the hot laminating machine 501 is provided with a frame 5019, on which an upper laminating roller 5013 and a lower laminating roller 5014 are provided, and one side of the frame 5019 is provided with a supporting roller 5017 for determining the passing height of the conveyed metal coil, a front film placing mechanism 5011 is provided on the upper side, a back film placing structure 5012 is provided on the lower side, a front flattening roller 5015 is provided on the upper right, and a back flattening roller 5016 is provided on the lower right. Before the laminating rollers press the film, the polymer film is unfolded by the flattening rollers, which have the function of flattening the polymer film. The metal coil is supported by the support roller 5017 and passes between the upper film roller 5013 and the lower film roller 5014. The upper film roller 5013 is controlled to move up and down by the lifting cylinder 5018 to press the film onto the surface of the metal coil. The front and back film placing mechanisms 5012 are respectively provided with two rollers 5021. The rollers 5021 are manually injected with compressed air to tighten the inner hole of the film. Two magnetic powder brakes 5020 are provided to maintain the tension of the film and are used to install and connect the previous film and the new film. The polymer film roller is installed on the roller 5021. The polymer film passes through the roller 5021 of the film placing mechanism. 21 rotates, and then is flattened by the front flattening roller 5015 and the back flattening roller 5016 respectively, and is pressed on the front and back sides of the metal coil by the upper coating roller 5013 and the lower coating roller 5014; wherein, a lifting cylinder 5018 is provided above the upper coating roller 5013 and the lower coating roller 5014, and the lifting cylinder 5018 is fixedly installed on the frame 5019, and its piston rod is connected with the upper coating roller 5013 and the lower coating roller 5014, so that the upper coating roller 5013 and the lower coating roller 5014 can realize up and down movement, which is convenient for the coating and pressing of the metal coil.

[0027] like Figure 4 As shown, the coating machine 505 is respectively provided with a back-side material-carrying roller 5053 and a back-side coating roller 5052 and a front-side material-carrying roller 5054 and a front-side coating roller 5051, so as to facilitate double-sided gluing of the metal coil and make the hot lamination more fitting.

[0028] The following is a production method for double-sided spraying and double-sided hot lamination of metal coils. The production method for double-sided spraying and double-sided hot lamination of metal coils adopts the above-mentioned production line for double-sided spraying and double-sided hot lamination of metal coils. The production method for double-sided spraying and double-sided hot lamination of metal coils includes the following steps: sequentially through unwinder A101A→entrance shear 102→unwinder B101B→clamping machine 103→sewing machine 104→burring machine 105→first tension machine 106→entrance looper 107→second tension machine 201→alkali solution soaking 2021→alkali solution brushing 2022→clean water brushing 2031→clean water soaking 2032→passivation device 204→passivation drying device 205→first deviation correcting machine 206→third tension machine 301→back electrostatic powder spraying device 302→back infrared curing device 401→air cooling device 404→water-cooled roller 405→coater 505→front electrostatic powder spraying device 303→front infrared curing device 402→oven 403→hot laminating machine 501→water-cooling device 502→second deviation correcting machine 503→fourth tension machine 504→fifth tension machine 701→exit looper 702→third deviation correcting machine 601→sixth tension machine 602→protective film laminating machine 603→film pressing machine 604→exit shear 703→bridge roller 704→winding machine 705.

[0029] In more detail, the guide coil on the uncoiler A 101A is cut off by the entrance shear 102, and the coil to be coated is placed on the uncoiler B 101B. The coil to be coated is guided to the guide coil cut off on the line by the clamping machine 103 and threaded to the seam 104 for seam connection, and the seam is pressed flat by the burr pressing machine 105 in turn, and the first tension machine 106 is used to adjust the balance and transport it to the entrance loop 107 for storage of the coil to be coated. After storing enough coils to be coated, it is further transported to the cleaning and passivation device 2; the coil to be coated exits the entrance loop 107 and is adjusted and balanced by the second tension machine 201, and then output, and is successively soaked in alkali solution 2021 for pre-degreasing, brushed with alkali solution 2022 for decontamination and impurity removal, brushed with clean water 2031 for removing surface alkali solution, soaked in clean water 2032 for cleaning with cleaning liquid, brushed with passivation liquid for passivation, and dried on the surface, and then passed through the first deviation correcting machine 206. To the electrostatic powder spraying device 3 or the hot laminating device 4; when the production line is used for double-sided spraying production of metal coils, the coating machine 505 and the hot laminating machine 501 are not loaded and operated, and are only used for production line transportation, that is, when the coil to be coated is sprayed, the coil to be coated is sequentially conveyed to the back electrostatic powder spraying device 302 for spraying through the third tension machine 301, to the back infrared curing device 401 for curing, and cooled by the air cooling device 404 and the water cooling roller 405, and then conveyed to the front electrostatic powder spraying device 303 for spraying through the coating machine 505, and cured by the front infrared curing device 402, and the temperature of the oven 403 is set at 230~280℃ for curing, and then conveyed to the water cooling device 502 for cooling through the hot laminating machine 501;When the production line is used for the production of double-sided hot lamination of metal coils, the back electrostatic powder spraying device 302, the infrared curing device, the air cooling device 404, the water cooling roller 405, and the front electrostatic powder spraying device 303 are not started without loading, and are only used for production line transportation. That is, when the coil to be coated is hot-laminated, the coil to be coated is sequentially conveyed to the coating machine 505 through the third tension machine 301, the back electrostatic powder spraying device 302, the back infrared curing device 401, the air cooling device 404, and the water cooling roller 405 for surface coating, and the primer is carried to the surface of the front coating roller 5051 and the back coating roller 5052 by the front belt roller 5054 and the back belt roller 5053 respectively, and the coil to be coated is sequentially conveyed to the front The coating roller 5051 and the back coating roller 5052 are coated on the front and back of the metal coil to complete the double-sided gluing, and then the metal coil is transported to the oven 403 through the front electrostatic powder spraying device 303 and the front infrared curing device 402. The temperature of the oven 403 is set at 150~250℃. Temperature sensors are respectively set at the upper and lower exits of the oven 403 to monitor the front and back temperatures of the coil to be coated. The surface temperature of the coil to be coated must be monitored to be within the range of 120~180℃, that is, the heating and temperature rise of the coil to be coated is used instead of the heating and hot lamination of the polymer film, so that the primer on the surface of the metal coil is activated and leveled more evenly, avoiding the problems of wrinkles or bubbles in the polymer film due to uneven heating, thereby improving the thermal lamination. In order to improve the surface processing quality and utilization rate of the polymer film, the coil to be coated is transported to the hot laminating machine 501. The polymer film on the hot laminating machine 501 is pressed on the coil to be coated and flattened by the front flattening roller 5015 and the back flattening roller 5016, and then transported through the laminating rollers on the frame 5019. The upper laminating roller 5013 is controlled by the lifting cylinder 5018 to move up and down and together with the lower laminating roller 5014, the flattened double-sided polymer film is laminated and hot-laminated. That is, double-sided hot laminating is completed by a hot laminating machine. At this time, the speed of the roller 5021 installed with the polymer film is adjusted by the reducer to match the speed of the production line, both of which are 20~80m / min. The metal coil after hot lamination The metal coil is transported to the water cooling device 502, which is composed of two groups of water cooling rollers. The traditional spray squeezing system is changed to reduce equipment investment. Each group of water cooling rollers can cool the front and back of the metal coil. The front and back of the metal coil are cooled twice by two groups of water cooling rollers, and the surface temperature of the metal coil is cooled to below 35°C. The metal coil after spraying or thermal lamination is transported to the outlet looper 702 for winding through the second deviation correcting machine 503, the fourth tension machine 504, and the fifth tension machine 701. The fourth tension machine 504 and the fifth tension machine 701 are continuously arranged to provide the required tension balance between the oven 403 and the thermal lamination device 5 and the thermal lamination device 5 and the outlet looper 702 respectively.The metal coil is sequentially conveyed to the protective film coating machine 603 through the outlet looper 702, the third deflection correction machine 601, and the sixth tension machine 602 to be coated with a protective film, mainly to coat the surface of the finished product with a protective film to protect the surface from secondary pollution and damage, and the film is pressed by the laminating machine 604, and then cut by the outlet shear 703, buffered by the bridge roller 704, and finally rolled up by the winder 705. ;

[0030] In addition, the production line can meet the requirements of double-sided spraying and double-sided hot lamination of metal coils as well as single-sided spraying and single-sided hot lamination. When the production line performs single-sided spraying, one group of electrostatic powder spraying devices can run the spraying. When the production line performs single-sided hot lamination, the film placing mechanism on one side of the hot laminating machine 501 can place the film.

[0031] In summary, whether it is double-sided spraying, double-sided hot lamination, or single-sided spraying or single-sided hot lamination, this production line can meet its production needs. The production lines can be used alone or in combination to obtain metal coils with different surface processing effects. Using the double-sided spraying production mode alone can obtain low-carbon and environmentally friendly continuous electrostatic powder spraying metal coils with high processability, high scratch resistance, super corrosion resistance, fine coating, zero pollution emissions and significantly improved production efficiency; using the double-sided hot lamination production mode alone can obtain hot-laminated metal coils with rich colors and patterns at low cost, with certain weather resistance, super acid and alkali resistance, and corrosion resistance, which can meet the needs of steel mills, power plants, chemical industry, animal husbandry and other application fields with high requirements for acid and alkali resistance and corrosion resistance.

[0032] The present invention changes the structural setting of the traditional thermal laminating machine 501. By setting up a double film release mechanism, the production of single-sided thermal laminating by a traditional single thermal laminating device is converted into double-sided thermal laminating by a single thermal laminating device at the same time, thereby reducing the investment in thermal laminating equipment, eliminating the roller heating setting of the thermal laminating device 5, and using the oven 403 to heat the metal coil instead of the traditional roller heating polymer film, so that the metal coil surface glue leveling is more uniform, the surface temperature is more uniform, the fit and utilization rate of the thermal laminating are improved, and the surface processing quality and production efficiency of the thermal laminating are improved; at the same time, by changing the traditional double-sided spraying and double-sided thermal laminating production line settings and production methods, by maximizing the adjustment of the resources of the electrostatic powder spraying device 3, the curing device 4 and the thermal laminating device 5, the heat of the oven 403 is used to meet the heating temperature requirements of the metal coil spraying curing and thermal laminating, so as to achieve the one-line multi-use of metal coil spraying and thermal laminating production, reduce the investment in heating equipment, and achieve the beneficial effects of reducing production costs, saving energy resources, and reducing environmental pollution.

[0033] It should be understood that the purpose of these embodiments is only to illustrate the present invention and is not intended to limit the protection scope of the present invention. In addition, it should also be understood that after reading the technical content of the present invention, those skilled in the art can make various changes, modifications and / or variations to the present invention, and all of these equivalent forms also fall within the protection scope defined by the appended claims of this application.

Claims

1. A production line for double-sided spraying and double-sided hot lamination of metal coils, characterized in that: It includes an unwinding device, a cleaning and passivation device, an electrostatic powder spraying device, a curing device, a hot laminating device, a protective film laminating device and a winding device which are arranged in sequence; The unwinding device comprises an unwinding machine A, an inlet shear, an unwinding machine B, a clamping machine, a sewing machine, a deburring machine, a first tension machine and an inlet looper connected in sequence, wherein two unwinding machines are provided, one for standby and the other for use; The cleaning and passivation device comprises a second tension machine, an alkali cleaning device, a water washing device, a passivation device, a passivation drying device and a first deviation correcting machine connected in sequence; The electrostatic powder spraying device comprises a third tension machine, a front electrostatic powder spraying device, and a back electrostatic powder spraying device; The curing device comprises a front infrared curing device, a back infrared curing device, an oven, an air cooling device and a water cooling roller; The thermal laminating device comprises a coating machine, a thermal laminating machine, a water cooling device, a second deviation correcting machine and a fourth tension machine, wherein the thermal laminating machine is arranged after the oven; The protective film coating device comprises a third deviation correcting machine, a sixth tension machine, and a connected protective film coating machine and a laminating machine, wherein the laminating machine is arranged after the protective film coating machine; The winding device includes a fifth tension machine, an exit looper, a bridge roller, an exit shear and a winding machine, wherein the exit looper is connected to the third deviation correcting machine, and the winding machine is used to wind the finished metal coil into a coil.

2. The production line for double-sided spraying and double-sided hot lamination of metal coils as claimed in claim 1, characterized in that: The layout of the production line is a multi-layer zigzag layout, the unwinding device and the winding device are arranged on the same horizontal line front and back, the entrance looper and the exit looper are arranged side by side at the same end, the entrance looper is connected to the first tension machine and the second tension machine front and back respectively, the exit looper is connected to the fifth tension machine and the third deviation correcting machine front and back respectively, the hot laminating machine is arranged at the outlet of the oven, and is connected to a water cooling device at the rear, the back electrostatic spraying device and the front electrostatic spraying device are arranged in a zigzag direction, and are each connected to an infrared curing device at the rear to ensure seamless switching of the production line between double-sided spraying and double-sided hot laminating production operations, the protective film coating device is arranged before the winding device to protect the surface of the metal coil after spraying or hot lamination from secondary pollution and damage.

3. The production line for double-sided spraying and double-sided hot lamination of metal coils as claimed in claim 1, characterized in that: The cleaning and passivation device is directly connected to the electrostatic powder spraying device through the first deviation correcting machine and the third tension machine. The electrostatic powder spraying device is connected to the coating machine, the curing device, and the thermal laminating device in sequence. The curing device is arranged between the electrostatic powder spraying device and the thermal laminating device, and can be used as a double-sided spray curing device and a double-sided thermal laminating heating device, respectively.

4. The production line for double-sided spraying and double-sided thermal lamination of metal coils according to claim 1, characterized in that: The alkaline washing device and the water washing device respectively include alkaline solution soaking and brushing and clean water brushing and soaking, ensuring that grease residues and residual alkaline solution are washed off the surface of the metal coil, which is convenient for surface spraying and hot lamination processing of the metal coil.

5. The production line for double-sided spraying and double-sided thermal lamination of metal coils according to claim 1, characterized in that: The coating machine is respectively provided with a back-side material belt roller and a back-side coating roller as well as a front-side material belt roller and a front-side coating roller, so as to facilitate double-sided gluing and hot lamination of metal coils.

6. The production line for double-sided spraying and double-sided thermal lamination of metal coils as claimed in claim 1, characterized in that: The hot laminating machine is provided with a frame, an upper laminating roller and a lower laminating roller are provided on the frame, a supporting roller is provided on one side of the frame, a front film placing mechanism is provided on the upper side, a back film placing structure is provided on the lower side, a front flattening roller is provided on the upper right side, and a back flattening roller is provided on the lower right side. The metal coil is supported by the supporting roller and passes between the upper laminating roller and the lower laminating roller. The front and back film placing mechanisms are respectively provided with two rollers for installing and connecting the front film and the new film. The polymer film roller is installed on the roller, the polymer film rotates through the roller of the film placing mechanism, and then is flattened respectively by the front flattening roller and the back flattening roller, and is pressed on the front and back sides of the metal coil by the upper laminating roller and the lower laminating roller; wherein, a lifting cylinder is provided above the upper laminating roller and the lower laminating roller, and the lifting cylinder is fixedly installed on the frame, and its piston rod is connected with the upper laminating roller and the lower laminating roller, so that the upper laminating roller and the lower laminating roller can realize up and down movement, which is convenient for the laminating and laminating of the metal coil.

7. A production method for double-sided spraying and double-sided thermal lamination of metal coils, characterized in that: The production method for double-sided spraying and double-sided hot lamination of metal coils adopts the production line for double-sided spraying and double-sided hot lamination of metal coils described in claim 1, and the production method for double-sided spraying and double-sided hot lamination of metal coils comprises the following steps: sequentially through uncoiler A→entrance shear→uncoiler B→clamping machine→sewing machine→deburring machine→first tension machine→entrance looper→second tension machine→alkali solution immersion→alkali solution brushing→clean water brushing→clean water immersion→passivation device→passivation drying device→first correcting machine→third tension machine→back electrostatic powder spraying device→back infrared curing device→air cooling device→water cooling roller→coating machine→front electrostatic powder spraying device→front infrared curing device→oven→hot laminating machine→water cooling device→second correcting machine→fourth tension machine→fifth tension machine→exit looper→third correcting machine→sixth tension machine→protective film laminating machine→film laminating machine→exit shear→bridge roller→winding machine.

8. The production method for double-sided spraying and double-sided thermal lamination of metal coils according to claim 7, characterized in that: When the production line is used for double-sided spraying of metal coils, the coating machine and the hot laminating machine are not loaded and operated, and are only used for production line transportation. When the production line is used for double-sided hot laminating of metal coils, the back electrostatic powder spraying device, infrared curing device, air cooling device, water-cooling roller, and front electrostatic powder spraying device are not loaded and operated, and are only used for production line transportation.

9. The production method for double-sided spraying and double-sided thermal lamination of metal coils according to claim 7, characterized in that: The oven temperatures are 230-280° C. and 150-250° C. during the production of double-sided spraying and double-sided thermal lamination of metal coils, respectively, and the line speed of the production line is 20-80 m / min.

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