Method for producing a patterned steel plate by using roller-coating printing and screen printing

A method for producing a patterned steel plate by using roller-coating printing and screen printing, at least comprising in sequence the following process steps of

• A. preparing a steel strip to be printed;
• B. using a first roller coating unit to perform a first roller coating transfer on the steel strip to be printed;
• C. using a second roller coating unit to perform a second roller coating transfer on the steel strip after a preset time, thus producing a pattern with a specific ground color by the first roller coating transfer and the second roller coating transfer;
• D. placing the steel strip having the pattern with a specific ground color formed thereon on a printing table and performing screen printing, so as to produce a pattern with a specific shape on the steel strip,
• wherein,
• in the step B, a servo control system is used to control the first roller coating unit, and the servo control system has a following control process of
• S1. inputting data of diameter of each roller and a process speed of the first roller coating unit into a PLC control module, then calculating out theoretical roller surface linear velocity of each roller by the PLC control module according to the process speed and the diameter of each roller, allowing the theoretical roller surface linear velocity of each roller to be consistent with the process speed, and outputting the calculated theoretical roll surface linear velocity signal of each roller into a servo control module having an encoder;
• S2. receiving the theoretical roll surface linear velocity signal of each roller by the servo control module from the PLC control module and driving each roller according to the theoretical roll surface linear velocity signal;
• S3. collecting actual roller surface linear velocity of each roller by the encoder and outputting the actual roller surface linear velocity signal of each roller into the PLC control module;
• S4. according to the received actual roller surface linear velocity signal and theoretical roller surface linear velocity signal of each roller, adjusting current frequency of electrical machine for driving each roller and adjusting the actual roller surface linear velocity of each roller to be consistent with the theoretical roller surface linear velocity of each roller by the PLC control module, thereby completing the roller coating transfer of the first roller coating unit;
• a flattening device is arranged at a bottom of the printing table, and before the screen printing of step D, flattens the surface of strip steel;
• the printing table is made of ferromagnetic material, and a magnet coil is arranged at a lower part of the printing table corresponding to a placement position of the strip steel and is connected with an energizing control device which is controlled to make the magnet coil energized when flattening so that the printing table is magnetized and the magnetized printing table attracts the strip steel and flattens the same;
• a plurality of through holes are arranged at the printing table corresponding to a placement position of the strip steel, and a fan is arranged at the bottom of the printing table and adapted for sucking air through the through holes when flattening, so as to form negative pressure in a clearance space formed by the strip steel and the printing table, and the strip steel is further pressed towards the printing table, and the flattening is completed.