Method and apparatus for manufacturing electronic device using roll-to-roll rotary pressing process

An apparatus for printing electronic devices, comprising:

• an ink reservoir storing functional ink therein;
• an ink injection roll installed to be immersed in the functional ink;
• a forming roll installed to be rotated in one direction while contacting the ink injection roll, with forming grooves provided on a surface of the forming roll to correspond to a shape of a desired circuit pattern;
• a doctor blade installed to contact a side of the forming roll, and scraping ink from a surface of the forming roll;
• a first drying device to dry a surface of the functional ink injected into each of the forming grooves of the forming roll;
• a printing roll installed to be rotated in a direction opposite that of the forming roll while contacting the forming roll, and transferring forming ink from the forming roll to a printing paper;
• a second drying device to dry another surface of the forming ink transferred to a surface of the printing roll;
• a press roll installed to be rotated in a direction opposite that of the printing roll while contacting the printing roll, and pressing the printing paper toward the printing roll at a constant pressure;
• a first pressure regulator coupled to the forming roll to allow the forming roll to be moved with respect toe printing roll for regulating contact pressure between the forming roll and the printing roll;
• a second pressure regulator coupled to the press roll to allow the press roll to be moved with respect to the printing roll for regulating contact pressure between the press roll and the printing roll;
• and
• a drying unit provided on a printing paper-path between the press roll and a guide roll located at an outside of the printing apparatus to dry ink transferred to the printing paper discharged from the press roll.

A method for regulating a contact pressure between a first roll made of metal material and a second roll covered with an elastomer layer formed thereon in an ink printing apparatus, comprising;

• mounting rotatably the first roll and the second roll having a diameter smaller than that of the first roll to the ink printing apparatus;
• coupling the first roll to a pressure regulating means and making two rolls rotate two revolutions with a set pressure to transfer ink from the first roll to the second roll;
• verify two ink patterns transferred from the first roll to the second roll;
• and
• operating the pressure regulating means to adjust a location of the first roll with respect to the second roll for regulating the set contact pressure between two rolls if the ink pattern on the second roll is not overlapped accurately with the ink pattern formed previously.