Method for producing a patterned steel plate with a single-ground color by using roller-coating printing and screen printing

A method for producing a patterned steel plate with a single-ground color 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 roller coating unit to perform a roller coating transfer on the steel strip to be printed and forming a single-ground color;
• C. placing the steel strip having the patterns with single-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 having the pattern with single-ground color;
• wherein,
• in the step B, a servo control system is used to control the roller coating unit, and the servo control system has the following control process of
• S1. inputting data of diameter of each roller and a process speed of the 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 roller coating unit;
• a flattening device is arranged at a bottom of the printing table, and used to flatten the surface of strip steel before the screen printing of step C;
• 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.