Abstract:
The ink-agitator 1 is supported and guided by fixed means between pedestals (2) and (3) above an ink fountain containing security ink. It is driven in alternate movement on its guiding means and its tip is dipping into the ink. Bore (11) receives a detector head in the form of a transformer with primary winding arranged for normally producing a "zero" magnetic field, adjustable ferrite core placed in such a manner that the "zero" magnetic field is obtained for a standard magnetic property of the security ink, and secondary winding going out of balance and issuing a signal if the magnetic property of the ink into which the tip of the ink-agitator is displaced undergoes modifications. The output signal is transmitted to feed line 4 with slide contact (6) whereas the ground pole is connected through wire (5) and sliding contact (7).
Abstract:
PROBLEM TO BE SOLVED: To provide an apparatus and a method for evaluating electrostatic gravure printing ink, which has a relation to evaluation using a real machine and evaluates electrostatic gravure printing ink extremely simply in comparison with a real machine.SOLUTION: The method for evaluating electrostatic gravure printing ink includes: an ink storage step of storing object ink for evaluation of electrostatic properties in a grounded conductive container; an electrode plate arrangement step of arranging the electrode plate above the conductive container so that a surface at a side opposing the surface of the ink stored in the conductive container becomes a horizontal plane; a voltage application step of making a voltage application means having an arranged ground electrode and an output electrode connected to the electrode plate apply a voltage to between the ground electrode and the output electrode; a distance measurement step of measuring distances up to the surface of the ink by a displacement sensor; and a displacement calculation step of calculating a displacement being a difference of distances obtained by the measurements before and after application of the voltage by the calculator.