Screen printing device

A screen printing device comprising:

• a screen disposed adjacent to an upper portion of a substrate on which a printing process is performed, and having a pattern to be printed on the substrate;
• a printing unit disposed on an upper portion of the screen and configured to discharge ink supplied from an outside to the screen and to print the pattern on the substrate;
• a driver connected to at least one of the screen and the printing unit and configured to drive at least one of the screen and the printing unit;
• and
• a controller connected to the printing unit and the driver and configured to control operations of the printing unit and the driver,
• wherein the printing unit comprises:
• a body having an ink supply hole formed in one side thereof, through which the ink is injected, and having an injection path formed therein, through which the ink moves;
• an ink pressurizing part disposed at the one side of the body so as to communicate with the injection path and configured to pressurize the ink which moves through the injection path;
• an ink discharge part disposed at one side of the body, facing the screen, so as to communicate with the injection path and configured to discharge the ink in a state of being in contact with screen;
• at least one pressure measurement part installed at a position adjacent to the ink discharge part of the body and configured to measure discharge pressure of the ink discharged from the ink discharge part;
• a temperature measurement part installed at a position adjacent to the ink discharge part of the body and configured to measure temperature of the ink discharged from the ink discharge part;
• and
• a temperature adjustment part disposed between the ink pressurizing part and the ink discharge part and configured to adjust the temperature of the ink,
• wherein, when at least one of the screen and the printing device moves in a state in which the printing unit contacts the screen, the controller controls the ink pressurizing part to adjust a discharge amount and a discharge pressure of the ink according to a measurement result of the at least one pressure measurement part and controls the printing device to perform printing on the substrate by using the discharge pressure of the ink,
• wherein the temperature adjustment part comprises at least one heating member disposed adjacent to the injection path between the ink pressurizing part and the ink discharge part;
• and at least one cooling member disposed outside the at least one heating member between the ink pressurizing part and the ink discharge part,
• wherein the controller controls the temperature adjustment part to adjust the temperature and viscosity of the ink discharged from the ink discharge part according to a measurement result of the temperature measurement part,
• wherein when the temperature of the ink should be increased, the controller drives both the at least one heating member and the at least one cooling member, and when the temperature of the ink should be decreased, the controller drives the at least one cooling member.