▎ 摘　　要

NOVELTY - Secondary composite process of metal plate coating comprises e.g. unwinding metal plate, connecting the two metal plates and sewing, preheating the metal plate, reheating the preheated metal plate, release the polyethylene foam film, when the film is released, the conveying speed of the polyethylene foam film and the metal plate is kept stable and synchronized, auxiliary heating, embossing the metal plate, heating and compounding polyethylene foam film and metal plate, cooling the single-sided film-coated metal plate, trimming to single-sided coated metal plate, adding protective film at double station, and compound a protective film on the upper film of the single-sided film-coated metal plate, so as to avoid upper film from being scratched, performing film release process, performing secondary composite heating on the lower film, cutting the double-sided film-coated metal plate, and rewinding. USE - The method is useful for secondary composite process of metal plate coating. ADVANTAGE - The coating plate has corrosion resistance, heat insulation, reducing noise characteristics and it can be widely applied to decoration interior building material. DETAILED DESCRIPTION - Secondary composite process of metal plate coating comprises (i) using unwinder to unwind the metal plate, (ii) connecting the two metal plates unwound in step (i) and sewing by plug-in type plate splicing machine, (iii) continue to unwind the stitched metal plate by adopting cylinder braking to change the rolling car, (iv) preheating the metal plate by means of supersonic heating, (v) reheating the preheated metal plate with a heating roller with a diameter of 500 mm, (vi) using double-station constant tension method to release the polyethylene foam film, when the film is released, the conveying speed of the polyethylene foam film and the metal plate is kept stable and synchronized, (vii) using infrared probe to measure the temperature of the metal plate and reheat the metal plate through the super audio heating method to realize the automatic heating and temperature control of the metal plate, (viii) using composite heating roller with a diameter of 350 mm and heating the metal plate with electric heating tube auxiliary heating, (ix) using three sets of embossing rollers with a cylinder diameter of 160 mm, supplementing by electric heating tubes for auxiliary heating, embossing the metal plate at 150-170°C and a pressure of 2 MPa, pattern can be matched by yourself, (x) film release operation of the upper film is carried out by using the film release process with double stations, automatic constant tension, and deviation correction function, when the film is released, the conveying speed of the upper film, polyethylene foam film and metal plate is kept stable and synchronized, (xi) using a corner heating roller with a diameter of 350 mm, heating and compounding polyethylene foam film and metal plate to obtain a single-sided coated metal plate, (xii) cooling the single-sided film-coated metal plate after thermal compounding through a water tank, (xiii) continue to conduct the cooled single-sided film-coated metal plate to the position of the water rolling roller, cooling down, and drain excess water from the single-side film-coated metal plate, (xiv) eight sets of chilled rolls with a diameter of 500 mm are used, performing secondary cooling on the single-sided film-coated metal plate to ensure the cooling effect, (xv) using a trimming device to trim the single-sided coated metal plate, and the trimming device automatically tracks the edge and automatically sucks away the trim, (xvi) adding the protective film at the double station, and compound a protective film on the upper film of the single-sided film-coated metal plate, so as to avoid the upper film from being scratched, (xvii) driving the single-sided film-coated metal plate forward by means of the rubber roller traction of the main machine, (xviii) performing a film release process on the lower film by means of constant tension, (xix) using 4 groups of glue spraying heads to spray glue on the polyethylene foam film in step (xvii), (xx) using an electric heating tube with a diameter of 350 mm to assist the heating roller, and perform secondary composite heating on the lower film in step (xviii) and the polyethylene foam film in step (xix) at 40-60°C and pressure of 2MPa to obtain double-sided coated metal plate, (xxi) using a shearing machine to cut the double-sided film-coated metal plate, and (xxii) rewinding double-sided film-coated metal sheet by double-winder with a cantilever load of 10 tons, and the sides are automatically aligned by hydraulic pressure, equipped with a hydraulic trolley. An INDEPENDENT CLAIM is also included for film-coated plate made by secondary composite process of metal plate coating, comprising an upper film, a polyethylene foam film, a metal bottom plate and a lower film.