Secondary composite process for coating metal plate and coated plate thereof

Abstract

The application discloses a secondary composite process of metal plate film covering and a film covering plate, and particularly relates to the production process field of the film covering metal plate, and the specific production steps are as follows: using a unwinding machine to unwind the metal plate; connecting and sewing two metal plates unwound in step S1 by a inserting belt type connecting plate machine; continuing to use a cylinder brake roll changing vehicle to change the metal plate after sewing; and preheating the metal plate by means of ultrasonic heating. The secondary film covering process of the metal plate is simultaneously completed on one production line, and on the basis of the traditional single layer film covering, the film covering composite production can be carried out on the single production line according to the sequence of the lower film, PE foaming film, metal plate and upper film from bottom to top, wherein the lower film and the upper film are both made of any one of PET, PVC, PVDF and ASA plastic film materials, and the prepared film covering plate has the characteristics of corrosion resistance, heat insulation and noise reduction, and can be widely applied to decoration and decoration building materials.

Description

TECHNICAL FIELD

[0001] The present application relates to the production process technical field of film-coated metal plate, more particularly, the present application relates to a secondary composite process of metal plate film coating and a film-coated plate. BACKGROUND

[0002] The metal plate film coating technology is a processing technology that plastic film and metal plate are bonded by high-temperature hot pressing. The film coating technology was born in Japan in 1977, and was initially used for can making, which can replace internal coating and external coating technology. Up to now, it has developed to various fields such as building material interior and exterior decoration, household appliances, and automobiles. The film coating finishing does not use adhesive and solvent, so it does not contain formaldehyde, and the plastic film can be treated for beautification, antibiosis, and dye resistance, which ensures the safety and health of human body, and also plays a role in environmental protection. The film-coated plate used in the can making industry is commonly known as laminated steel, which is made by bonding PP film and tinplate. The inner side of the traditional metal plate must be subjected to surface treatment before being put on the market, and the substances contained in the surface treatment process will have harmful effects on human body and environment, especially for edible cans. The current domestic and foreign cans are dyed by using the coating method. However, the material used in this method contains harmful substances such as bisphenol A, which is an internationally recognized environmental hormone, and may cause problems such as excretion. Once the problem occurs, it will have adverse effects on human body. The serious consequences caused by this problem have attracted attention at home and abroad.

[0003] The birth of the metal plate film coating technology is a revolutionary progress in metal plate production. With its wide application, the traditional metal can production process and technology will be overturned, and the production rate, production cost, cleanliness, environmental protection and other aspects will also make great progress. The film-coated plate is a kind of metal material with excellent deep resistance, corrosion resistance, and decorative properties, which has the dual characteristics of high molecular resin film and metal plate. This feature determines that the film-coated plate can use cold rolled plate as base material, and quickly and accurately cover the printing film. Therefore, the film-coated plate greatly reduces the material cost.

[0004] The existing film-coated metal plate technology is constantly maturing, and various film-coated metal plate materials are constantly appearing on the market to meet the use requirements of various industries. However, in the production process of the existing film-coated metal plate, the processes of each link are separately made, and multiple stages of manual and reciprocating multiple operations are required to complete the production of the required film-coated metal plate, thereby reducing the production efficiency of the film-coated metal plate, and even causing the appearance of the finished film-coated metal plate. SUMMARY

[0005] In order to overcome the above-mentioned defects of the prior art, embodiments of the present application provide a secondary composite process for laminating metal plates and a laminated plate thereof, and the technical problem to be solved by the present application is how to simultaneously complete the laminating of both sides of the metal plate on the same production line, once forming, solving the existing upper and lower films on the metal plate separately on the production line, and reducing the production efficiency.

[0006] To achieve the above object, the present application provides the following technical scheme: a secondary composite process for laminating metal plates, and the specific production steps are as follows:

[0007] S1: using a unwinding machine to unwind the metal plate;

[0008] S2: connecting and sewing the two metal plates unwound in step S1 by the inserting tape type butt plate machine;

[0009] S3: continuing to unwind the sewed metal plate by using the air cylinder brake roll changing roller;

[0010] S4: preheating the metal plate by ultrasonic heating;

[0011] S5: re-heating the preheated metal plate by using a heating roller with a diameter of 500mm;

[0012] S6: using a double-station constant tension method to perform a film unwinding process, and keeping the conveying speed of the PE foam film and the metal plate stable and synchronous during the film unwinding;

[0013] S7: again heating the metal plate in step S6 by using ultrasonic heating, and using an infrared probe to measure the temperature of the metal plate to realize automatic heating and temperature control of the metal plate;

[0014] S8: heating the metal plate in step S7 by using a composite heating roller with a diameter of 350mm and assisted heating by an electric heating tube;

[0015] S9: using three groups of embossing rollers with a diameter of 160mm, assisted heating by an electric heating tube, and under the conditions of a temperature of 150-170℃ and a pressure of 2MPa, performing an embossing process on the metal plate in step S8, and the patterns can be matched;

[0016] S10: using a double-station, automatic constant tension, film unwinding process with a deviation correcting function to perform an upper film unwinding operation, and keeping the conveying speed of the upper film, the PE foam film and the metal plate stable and synchronous during the film unwinding;

[0017] S11: using a corner heating roller with a diameter of 350mm to heat and composite the upper film, the PE foam film and the metal plate after step S10 under the conditions of a temperature of 130-170℃ and a pressure of 2MPa, to obtain a single-side laminated metal plate.

[0018] S12: cooling the single-sided coated metal plate after thermal compounding in step S11 through a water tank;

[0019] S13: continuously conducting the single-sided coated metal plate after cooling in step S12 to a water roller position, cooling and lowering the temperature of the single-sided coated metal plate, and removing excess water from the single-sided coated metal plate;

[0020] S14: using eight groups of cold water rollers with a diameter of 500 mm to perform secondary cooling on the single-sided coated metal plate after step S13, so as to ensure the cooling effect;

[0021] S15: using an edge trimming device to perform edge trimming processing on the single-sided coated metal plate after step S14, the edge trimming device automatically tracks the edge and automatically sucks away the edge material;

[0022] S16: double-station protective film, a protective film is compounded on the single-sided coated metal plate after step S15 to avoid the protective film being scratched;

[0023] S17: the single-sided coated metal plate in step S15 is driven forward in a main machine glue roller traction mode;

[0024] S18: a constant tension mode is used to perform a film releasing process on the lower film;

[0025] S19: four groups of glue spraying heads are used to perform glue spraying processing on the PE foam film in step S17;

[0026] S20: a heating roller with a diameter of 350 mm is used to perform secondary compounding and heating on the lower film in step S18 and the PE foam film in step S19 under the working conditions of a compounding temperature of 40-60°C and a pressure of 2 MPa, so as to obtain a double-sided coated metal plate;

[0027] S21: a plate shearing machine is used to perform shearing on the double-sided coated metal plate in step S20;

[0028] S22: a double winding machine with a cantilever load of 10 tons is used to wind the compounded plate after shearing in step S21, and a hydraulic automatic edge alignment is used, and a hydraulic trolley is used.

[0029] In a preferred embodiment, the unwinding machine in step S1 has a cantilever load of 10 tons, a hydraulic automatic edge alignment, a hydraulic trolley, an unwinding motor of 22 KW and 6 poles, and a direct-connection gear box.

[0030] In a preferred embodiment, the strip inserting type plate connecting machine in step S2 uses hydraulic control, the plate connecting thickness is less than 0.5 mm, and a small rolling mill is used to flatten the connecting part of the plate.

[0031] In a preferred embodiment, the heating power of the supersonic frequency in step S4 is proportional to the conveying speed of the metal plate.

[0032] In a preferred embodiment, the heating roller in step S5 adopts a periphery punching, and a built-in graphene with a heat transfer efficiency of 0-200℃ / min; there are seven groups of heating rollers, and the heat transfer efficiency of the heating roller is proportional to the conveying speed of the metal plate, and the temperature is automatically controlled.

[0033] In a preferred embodiment, the composite temperature of the protective film and the upper film in step S16 is set to 50-70℃, and the pressure value is set to 2MPa.

[0034] In a preferred embodiment, the host rubber roller in step S17 has a diameter of 500m, a cylinder with a diameter of 200mm, a gear box of 250 type, and a motor of 4 levels 18.5KW.

[0035] A metal plate film-coated plate prepared by a secondary composite process of a metal plate film-coated plate: the film-coated plate comprises an upper film, a PE foam film, a metal bottom plate and a lower film.

[0036] In a preferred embodiment, the upper film and the lower film are both set as any one of PET, PVC, PVDF, ASA plastic film materials, and the metal bottom plate is set as a stainless steel plate.

[0037] Technical effects and advantages of the present application:

[0038] The present application simultaneously completes the secondary film-coating process of the metal plate on one production line, and on the basis of the traditional single-layer film-coating, the film-coating composite production can be carried out in the order of the lower film, the PE foam film, the metal plate and the upper film from bottom to top on a single production line, wherein the lower film and the upper film are both made of any one of PET, PVC, PVDF, ASA plastic film materials, the comprehensive unqualified rate of the film-coated plate prepared by the secondary film-coating process of the present application is significantly reduced, and the film-coated metal plate has the characteristics of corrosion resistance, heat insulation and noise reduction, and can be widely applied to decoration and decoration building materials, which has great progress compared with the existing market technology. BRIEF DESCRIPTION OF DRAWINGS

[0039] Figure 1 The present application is a film-coated metal plate production line process schematic diagram. DETAILED DESCRIPTION

[0040] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, not all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0041] Embodiment 1:

[0042] The present application provides a secondary composite process for a metal plate film coating as shown in the following specific production steps: Figure 1

[0043] S1: use the unwinding machine to unwind the metal plate, the cantilever bearing of the unwinding machine is 10 tons, the hydraulic automatic edge alignment is equipped with a hydraulic trolley, the unwinding motor is 22KW, 6-pole, and the direct connection gear box;

[0044] S2: the two metal plates unwound in step S1 are connected and sewn by the plug-in strip butt joint machine, the plug-in strip butt joint machine is controlled by hydraulic pressure, the butt joint thickness of the two metal plates is less than 0.5mm, and a small rolling mill is equipped to flatten the butt joint;

[0045] S3: continue to unwind the metal plate after sewing by using the air cylinder brake roll changing mill;

[0046] S4: preheat the metal plate by ultrasonic heating, and the heating power is proportional to the conveying speed of the metal plate;

[0047] S5: reheat the preheated metal plate by using a heating roller with a diameter of 500mm, the heating roller is punched on the periphery, and the built-in graphene has a heat transfer efficiency of 0-200℃ / min; there are seven groups of heating rollers, the heat transfer efficiency of the heating roller is proportional to the conveying speed of the metal plate, and the temperature is automatically controlled;

[0048] S6: use the lower film roller to perform the lower film coating and film unwinding process, use the double-station film unwinding automatic constant tension stand with the correction function to keep the conveying speed of the PE foam film and the metal plate stable and synchronous;

[0049] S7: continue to heat the metal plate in step S6 by two rounds of ultrasonic heating, use the infrared probe to measure the temperature of the metal plate to realize automatic heating and temperature control of the metal plate;

[0050] S8: heat the metal plate in step S7 by using a composite heating roller with a diameter of 350mm and auxiliary heating by an electric heating tube;

[0051] S9: use three groups of embossing rollers with a diameter of 160mm, assisted by an electric heating tube for auxiliary heating, to perform embossing treatment on the metal plate in step S8 at a temperature of 150℃-170℃ and a pressure of 2MPa, and the pattern can be matched;

[0052] S10: use the double-station, automatic constant tension, and correction function film unwinding process to perform the film unwinding operation, and keep the conveying speed of the upper film, the PE foam film, and the metal plate stable and synchronous during the film unwinding;

[0053] ​S11: A corner heating roller with a diameter of 350 mm is used to heat-composite the upper film, PE foaming film and metal plate after step S10 at a temperature of 120 DEG C and a pressure of 2 MPa, to obtain a single-coated film metal plate;

[0054] S12: The single-coated film metal plate after heat-composition in step S11 is cooled by a water tank;

[0055] S13: The single-coated film metal plate after cooling in step S12 is continuously conducted to a water-rolling position for cooling and the excess water in the single-coated film metal plate is removed;

[0056] S14: Eight groups of cold water rollers with a diameter of 500 mm are used to secondarily cool the single-coated film metal plate after step S13 to ensure the cooling effect;

[0057] S15: An edge trimming device is used to trim the edges of the single-coated film metal plate after step S14, which automatically tracks the edges and automatically sucks away the edge materials;

[0058] S16: A double-station protective film is used to coat a protective film on the single-coated film metal plate after step S15, the heat-composition temperature of the protective film and the upper film is set to 50 DEG C-70 DEG C, and the pressure value is set to 2 MPa to avoid the upper film being scratched;

[0059] S17: The single-coated film metal plate in step S15 is driven forward by a main machine rubber roller;

[0060] S18: A constant tension method is used to coat a lower film;

[0061] S19: Four groups of glue spraying heads are used to spray glue on the PE foaming film in step S17;

[0062] S20: An electric heating tube auxiliary heating roller with a diameter of 350 mm is used to secondarily composite and heat the lower film in step S18 and the PE foaming film in step S19 at a composite temperature of 40 DEG C-60 DEG C and a pressure of 2 MPa, to obtain a double-coated film metal plate;

[0063] S21: A plate shearing machine is used to shear the double-coated film metal plate in step S20;

[0064] S22: A double-winding machine with a cantilever load of 10 tons is used to wind the sheared double-coated film metal plate in step S21, which is automatically aligned by a hydraulic edge and is equipped with a hydraulic trolley.

[0065] A kind of film-coated plate of metal plate film-coated secondary composite process is prepared: the film-coated plate includes upper film, PE foamed film, metal bottom plate and lower film, the upper film and lower film are set as any one of PET, PVC, PVDF, ASA plastic film material, the metal bottom plate is set as stainless steel plate.

[0066] Example 2:

[0067] The application provides a kind of metal plate film-coated secondary composite process as shown in Figure 1 Specific production steps are as follows:

[0068] S1: using unwinding machine to metal plate, unwinding machine cantilever bearing 10 tons, hydraulic automatic edge, with hydraulic trolley, unwinding motor 22KW, 6-pole, direct gear box;

[0069] S2: by inserting strip type abutment machine, the two metal plates of step S1 are connected and stitched, the inserting strip type abutter machine is controlled by hydraulic pressure, the thickness of the abutment at the butt joint of the two metal plates is less than 0.5mm, and the small rolling mill is used to flatten the abutment connection;

[0070] S3: continue to use the air cylinder brake change volume rolling mill to continue to unwind the metal plate after stitching;

[0071] S4: the metal plate is preheated by ultrasonic heating, and the heating power is proportional to the conveying speed of the metal plate;

[0072] S5: the preheated metal plate is reheated by using a heating roller with a diameter of 500mm, the heating roller is provided with a plurality of holes around the periphery, and the built-in graphene has a heat transfer efficiency of 0-200℃ / min;Seven groups of heating rollers, the heat transfer efficiency of the heating roller is proportional to the conveying speed of the metal plate, and the temperature is automatically controlled;

[0073] S6: the lower film roller is used for lower film coating and film coating process, the PE foamed film is placed in double-station film coating automatic constant tension stand with deviation correction function, so that the conveying speed of the PE foamed film and the metal plate is kept stable and synchronous;

[0074] S7: two rounds of ultrasonic heating continue to heat the metal plate of step S6, the infrared probe is used to measure the temperature of the metal plate, so as to realize automatic heating and temperature control of the metal plate;

[0075] S8: the metal plate in step S7 is heated by using a composite heating roller with a diameter of 350mm and an electric heating tube for auxiliary heating;

[0076] S9: three groups of embossing rollers with a diameter of 160mm are used, assisted by electric heating tube auxiliary heating, at a temperature of 150℃-170℃, under the condition of pressure 2MPa, the metal plate in step S8 is embossed, and the pattern can be matched by itself;

[0077] S10: Film placing operation is performed on the film placing process with double stations, automatic constant tension, and film rectification function to place the film. The conveying speed of the film to be placed, the PE foamed film, and the metal plate is kept stable and synchronized during the film placing;

[0078] S11: The film to be placed, the PE foamed film, and the metal plate after step S10 are heated and compounded under the conditions of a temperature of 150 DEG C and a pressure of 2 MPa by using a corner heating roller with a diameter of 350 mm, to obtain a single-coated film metal plate;

[0079] S12: The single-coated film metal plate after the heat compounding in step S11 is cooled by a water tank;

[0080] S13: The single-coated film metal plate after the cooling in step S12 is continuously conducted to a water roller position, cooled, and the excess water in the single-coated film metal plate is removed;

[0081] S14: The single-coated film metal plate after step S13 is secondarily cooled by using eight groups of cold water rollers with a diameter of 500 mm to ensure the cooling effect;

[0082] S15: The single-coated film metal plate after step S14 is edge-cut processed by using an edge cutting device which automatically tracks the edge and automatically sucks away the edge material;

[0083] S16: Double-station film placing is performed on the single-coated film metal plate after step S15 to compound a protective film on the single-coated film metal plate. The heat compounding temperature of the protective film and the film to be placed is set to 50 DEG C-70 DEG C, and the pressure value is set to 2 MPa to avoid the film to be placed being scratched;

[0084] S17: The single-coated film metal plate in step S15 is driven forward by the main machine rubber roller;

[0085] S18: Film placing process is performed on the film to be placed by using a constant tension method;

[0086] S19: The PE foamed film in step S17 is sprayed by using four groups of glue spraying heads;

[0087] S20: The film to be placed in step S18 and the PE foamed film in step S19 are secondarily compounded and heated under the working conditions of a compounding temperature of 40 DEG C-60 DEG C and a pressure of 2 MPa by using a heating roller assisted by an electric heating tube with a diameter of 350 mm, to obtain a double-coated film metal plate;

[0088] S21: The double-coated film metal plate in step S20 is cut by using a plate shearing machine;

[0089] S22: The double-coiled metal plate after shearing in step S21 is coiled by a double coiler capable of bearing 10 tons, and is automatically aligned by a hydraulic pressure, and is equipped with a hydraulic pressure trolley.

[0090] A metal plate film-coated secondary composite process prepared film-coated plate: the film-coated plate comprises an upper film, a PE foamed film, a metal bottom plate and a lower film, the upper film and the lower film are both set as any one of PET, PVC, PVDF, ASA plastic film material, and the metal bottom plate is set as stainless steel plate.

[0091] Example 3:

[0092] The application provides a metal plate film-coated secondary composite process as shown in Figure 1 The specific production steps are as follows:

[0093] S1: The metal plate is unwound by using an unwinding machine, the unwinding machine has a cantilever capable of bearing 10 tons, is automatically aligned by a hydraulic pressure, is equipped with a hydraulic pressure trolley, has a 22KW, 6-pole direct-connection gear box, and is connected with an unwinding motor;

[0094] S2: The two metal plates unwound in step S1 are connected and sewn by using a strip-inserting butt plate machine, the strip-inserting butt plate machine is controlled by a hydraulic pressure, the butt plate thickness at the butt joint of the two metal plates is less than 0.5mm, and a small rolling trolley is used to flatten the butt joint;

[0095] S3: The metal plate after sewing is continuously unwound by using a cylinder brake change-over rolling trolley;

[0096] S4: The metal plate is preheated by using ultrasonic heating, and the heating power is proportional to the conveying speed of the metal plate;

[0097] S5: The preheated metal plate is reheated by using seven groups of heating rollers with a diameter of 500mm, the heating rollers are provided with holes in the periphery and are internally provided with graphene with a heat transfer efficiency of 0-200℃ / min; the heat transfer efficiency of the heating rollers is proportional to the conveying speed of the metal plate, and the temperature is automatically controlled;

[0098] S6: The lower film is placed by using a lower film roller, the PE foamed film is placed by using a double-station film placing automatic constant tension device, and the device has a deviation rectifying function, so that the conveying speed of the PE foamed film and the metal plate is kept stable and synchronized;

[0099] S7: The metal plate in step S6 is continuously heated by using two rounds of ultrasonic heating, the temperature of the metal plate is measured by using an infrared probe, and the metal plate is automatically heated and temperature-controlled;

[0100] S8: The metal plate in step S7 is heated by using a composite heating roller with a diameter of 350mm and an auxiliary heating electric heating tube;

[0101] S9: The metal plate in step S8 is embossed at a temperature of 150-170℃ and a pressure of 2 MPa by using three groups of embossing rollers with a diameter of 160 mm, assisted by electric heating pipes, and the patterns can be matched by themselves;

[0102] S10: Film placement operation is performed by using a double-station, automatic constant tension, film placement process with a deviation correction function, and the conveying speed of the film and the metal plate is kept stable and synchronized during film placement;

[0103] S11: The film, the PE foam film and the metal plate after step S10 are heated and compounded by using a diameter of 350 mm of the corner heating roller at a temperature of 150℃ and a pressure of 1.5 MPa, to obtain a single-coated metal plate;

[0104] S12: The single-coated metal plate after heat compounding in step S11 is cooled by a water tank;

[0105] S13: The single-coated metal plate after cooling in step S12 is continuously conducted to the water roller position for cooling and temperature reduction, and the excess water in the single-coated metal plate is removed;

[0106] S14: The single-coated metal plate after step S13 is secondarily cooled by using eight groups of cold water rollers with a diameter of 500 mm to ensure the cooling effect;

[0107] S15: The single-coated metal plate after step S14 is edge-cut processed by using an edge trimming device, which automatically tracks the edge and automatically sucks away the edge material;

[0108] S16: Double-station protective film placement, which places a protective film on the single-coated metal plate after step S15, the protective film and the film heating compounding temperature is set to 50-70℃, and the pressure value is set to 2 MPa to avoid the film being scratched;

[0109] S17: The single-coated metal plate in step S15 is driven forward by the main machine rubber roller traction;

[0110] S18: Film placement process is performed on the lower film by using a constant tension method;

[0111] S19: The PE foam film in step S17 is sprayed by using four groups of glue spraying heads;

[0112] S20: The lower film in step S18 and the PE foam film in step S19 are secondarily compounded and heated at a compounding temperature of 40-60℃ and a pressure of 2 MPa by using a diameter of 350 mm of the electric heating pipe assisted heating roller, to obtain a double-coated metal plate;

[0113] S21: using a plate shearing machine to shear the double-sided film-coated metal plate in step S20;

[0114] S22: using a double-rolling machine with a cantilever load of 10 tons to roll the double-sided film-coated metal plate after shearing in step S21, and using hydraulic automatic edge alignment and hydraulic trolley.

[0115] A film-coated plate prepared by a secondary composite process of metal plate film coating: the film-coated plate comprises an upper film, a PE foamed film, a metal bottom plate and a lower film, the upper film and the lower film are both set as any one of PET, PVC, PVDF, ASA plastic film materials, and the metal bottom plate is set as a stainless steel plate.

[0116] Example 4:

[0117] The application provides a secondary composite process of metal plate film coating as shown in Figure 1 The specific production steps are as follows:

[0118] S1: using a rolling machine to roll out the metal plate, the rolling machine has a cantilever load of 10 tons, hydraulic automatic edge alignment, hydraulic trolley, rolling motor 22KW, 6-pole, direct connection gear box;

[0119] S2: using a strip inserting type plate connecting machine to connect and sew the two metal plates rolled out in step S1, the strip inserting type plate connecting machine is controlled by hydraulic pressure, the thickness of the connecting plate at the butt joint of the two metal plates is less than 0.5mm, and a small rolling mill is arranged to flatten the connecting plate;

[0120] S3: continuing to roll out the sewed metal plate by using a cylinder brake change-over rolling mill;

[0121] S4: preheating the metal plate by using ultrasonic heating, and the heating power is proportional to the conveying speed of the metal plate;

[0122] S5: re-heating the preheated metal plate by using a heating roller with a diameter of 500mm, the heating roller is provided with a plurality of holes in the periphery and is internally provided with graphene with a heat transfer efficiency of 0-200℃ / min; there are seven groups of heating rollers, the heat transfer efficiency of the heating roller is proportional to the conveying speed of the metal plate, and the temperature is automatically controlled;

[0123] S6: using a lower film roller to perform a lower film coating and film placing process, using a double-station film placing automatic constant tension stand to place the PE foamed film, and using a deviation rectifying function to keep the conveying speed of the PE foamed film and the metal plate stable and synchronous;

[0124] S7: continuing to heat the metal plate in step S6 by using two rounds of ultrasonic heating, using an infrared probe to measure the temperature of the metal plate, and realizing automatic heating and temperature control of the metal plate;

[0125] S8: The metal plate in step S7 is heated by using a composite heating roller with a diameter of 350 mm and auxiliary heating by an electric heating tube;

[0126] S9: The metal plate in step S8 is embossed by using three groups of embossing rollers with a diameter of 160 mm, auxiliary heating by an electric heating tube, at a temperature of 150-170°C, and under a pressure of 2 MPa, and the patterns can be matched by themselves;

[0127] S10: The film placing operation of the film is performed by using a double-station, automatic constant tension, and film deviation correction function film placing process, and the conveying speed of the film and the PE foam film and the metal plate is kept stable and synchronized during the film placing;

[0128] S11: The film, the PE foam film, and the metal plate after step S10 are heated and compounded by using a corner heating roller with a diameter of 350 mm at a temperature of 180°C and a pressure of 2 MPa, to obtain a single-coated film metal plate;

[0129] S12: The single-coated film metal plate after the heat compounding in step S11 is cooled by a water tank;

[0130] S13: The single-coated film metal plate after the cooling in step S12 is continuously conveyed to a water roller position for cooling and temperature reduction, and the excess water in the single-coated film metal plate is removed;

[0131] S14: The single-coated film metal plate after step S13 is secondarily cooled by using eight groups of cold water rollers with a diameter of 500 mm to ensure the cooling effect;

[0132] S15: The single-coated film metal plate after step S14 is edge-cut processed by using an edge cutting device, which automatically tracks the edge and automatically sucks away the edge material;

[0133] S16: A double-station protective film is placed, which places a protective film on the single-coated film metal plate after step S15, and the heating compounding temperature of the protective film and the film is set to 50-70°C, and the pressure value is set to 2 MPa to avoid the film being scratched;

[0134] S17: The single-coated film metal plate in step S15 is driven forward by a main machine rubber roller;

[0135] S18: The film is placed by using a constant tension method;

[0136] S19: The PE foam film in step S17 is sprayed by using four groups of glue spraying heads;

[0137] S20: The lower film in step S18 and the PE foaming film in step S19 are secondarily compounded and heated by a 350mm diameter electric heating pipe auxiliary heating roller under a 2MPa working condition of a 40-60℃ compounding temperature and a pressure to obtain a double-sided coated metal plate;

[0138] S21: The double-sided coated metal plate in step S20 is sheared by a plate shearing machine;

[0139] S22: The sheared double-sided coated metal plate in step S21 is wound by a 10-ton cantilever bearing double winding machine, and the hydraulic automatic edge alignment is matched with a hydraulic trolley.

[0140] A coated plate prepared by a secondary compounding process of a metal plate coating: the coated plate comprises an upper film, a PE foaming film, a metal bottom plate and a lower film, the upper film and the lower film are both set as any one of PET, PVC, PVDF, ASA plastic film materials, and the metal bottom plate is set as a stainless steel plate.

[0141] The coated plates prepared in the above examples 1-4 are respectively taken for data testing, and the following data are obtained:

[0142]

[0143] As shown in the above table, the preparation process in example 2 is the best, the comprehensive unqualified rate of the coated plate prepared by the process is less than 3‰, the demolding and surface bubble conditions of the coated plate prepared by the process are greatly reduced compared with the coated plate prepared by the prior art, and the forming effect of the coated plate is ensured.

[0144] Finally, it should be pointed out that in the description of the present application, it should be pointed out that unless otherwise specified and limited, the terms "installation", "connection", "connection" should be understood broadly, which can be mechanical connection or electrical connection, or the communication between two elements, or direct connection, "up", "down", "left", "right" and the like are only used to indicate the relative positional relationship, when the absolute position of the described object changes, the relative positional relationship may change;

[0145] Secondly: the present application discloses the structure involved in the embodiment of the present application, and other structures can be referred to the usual design, and the same embodiment and different embodiments of the present application can be combined with each other under the condition of no conflict;

[0146] Finally: the above is only the preferred embodiment of the present application, and is not used to limit the present application, any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims

1. A secondary composite process for coating a metal sheet, characterized in that: The specific production steps are as follows: S1: using a pay-off machine to pay off the metal plate; S2: connecting and sewing the two metal plates paid off in step S1 by a plug-in tape butt joint machine; S3: continuing to pay off the sewn metal plate by using a cylinder brake change-over roll mill; S4: preheating the metal plate by ultrasonic heating; S5: re-heating the preheated metal plate by using a 500mm diameter heating roller; S6: using a double-station constant tension method to pay off the PE foam film, and keeping the conveying speed of the PE foam film and the metal plate stable and synchronized during the film paying-off process; S7: using an infrared probe to measure the temperature of the metal plate and re-heating the metal plate by ultrasonic heating to realize automatic heating and temperature control of the metal plate; S8: using a 350mm diameter composite heating roller and an electric heating tube for auxiliary heating to heat the metal plate in step S7; S9: using a 160mm diameter embossing roller with three groups of cylinders, assisted by an electric heating tube for auxiliary heating, to emboss the metal plate in step S8 at a temperature of 150-170℃ and a pressure of 2MPa, and the pattern can be customized; S10: using a double-station, automatic constant tension, film paying-off process with a film rectifying function to perform the film paying-off operation, and keeping the conveying speed of the upper film, the PE foam film and the metal plate stable and synchronized during the film paying-off process; S11: using a 350mm diameter corner heating roller to heat and composite the upper film, the PE foam film and the metal plate after step S10 at a temperature of 130-170℃ and a pressure of 2MPa to obtain a single-sided coated metal plate; S12: cooling the single-sided coated metal plate after step S11 by a water tank; S13: continuing to conduct the single-sided coated metal plate after step S12 to the water roller position to cool and cool it down, and removing the excess water from the single-sided coated metal plate; S14: using eight groups of 500mm diameter cold water rollers to perform secondary cooling on the single-sided coated metal plate after step S13 to ensure the cooling effect; S15: using an edge trimming device to trim the edges of the single-sided coated metal plate after step S14, which automatically tracks the edge and automatically sucks away the edge material; S16: double-station protective film paying-off, which composites a layer of protective film on the single-sided coated metal plate after step S15 to prevent the upper film from being scratched; S17: using the main machine rubber roller to drive the single-sided coated metal plate in step S15 to move forward; S18: using a constant tension method to perform a film paying-off process on the lower film; S19: using four groups of glue injection heads to perform glue injection treatment on the PE foam film in step S17; S20: using a 350mm diameter electric heating tube auxiliary heating roller to perform secondary composite heating on the lower film in step S18 and the PE foam film in step S19 at a composite temperature of 40-60℃ and a pressure of 2MPa to obtain a double-sided coated metal plate; S21: using a plate shearing machine to shear the double-sided coated metal plate in step S20; S22: with cantilever load 10 tons of double winding machine after cutting in step S21 double-sided film metal plate is rolled, hydraulic automatic edge, with hydraulic trolley.

2. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The unwinding machine in step S1 has a cantilever load of 10 tons, hydraulic automatic edge, hydraulic trolley, and the power of the unwinding machine is 22 KW.

3. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The step S2 insert strip type plate machine adopts hydraulic control, the thickness of the metal plate is less than 0.5mm, and the small rolling mill is arranged to flatten the connecting part of the plate.

4. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The heating power of the ultrasonic frequency in step S4 is proportional to the metal plate conveying speed.

5. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The heating roller in step S5 adopts peripheral punching, and the built-in heat transfer efficiency is 0-200℃ / min graphene; there are seven groups of heating rollers, and the heat transfer efficiency of the heating roller is proportional to the metal plate conveying speed, and the heating roller is automatically temperature controlled.

6. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The protection film and the film heating composite temperature in step S16 are set to 50-70℃, and the pressure value is set to 2MPa.

7. The secondary composite process for laminating a metal sheet according to claim 1, characterized in that: The main machine rubber roller diameter in step S17 is 500m, the cylinder diameter is 200mm, the gear box is 250 type, and the motor power is 18.5KW.

8. A clad sheet prepared by the secondary clad process according to any one of claims 1 to 7, characterized in that: The film-coated plate comprises an upper film, a PE foam film, a metal bottom plate and a lower film.

9. A clad sheet prepared by the secondary clad process of claim 8, wherein: The upper film and the lower film are both set as any one of PET, PVC, PVDF and ASA plastic film materials, and the metal bottom plate is set as a stainless steel plate.

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