| 摘要 |
An improved electrocoagulation printing method is disclosed. A plurality of dots of colored, coagulated colloid representative of a desired image are formed on a moving, olefin-coated surface of a positive electrode, by electrocoagulation of a colloid present in an electrocoagulation printing ink filling an electrode gap defined between a positive electrode and a plurality of negative electrodes. The improvement comprises applying to selected negative electrodes a trigger signal of a voltage sufficient to energize same and cause point-by-point selective coagulation and adherence of the colloid onto the positive electrode active surface opposite the surfaces of the energized electrodes. The trigger signal comprises at least two consecutive pulses having the aforesaid voltage and a predetermined pulse duration with a time interval therebetween at least as long as the pulse duration, so as to increase the amount of colored, coagulated colloid deposited onto the positive electrode active surface and forming each dot of colored, coagulated colloid, without causing undesirable gas generation at the negative electrodes, thereby increasing the optical density of each dot and of the resulting image. <IMAGE> |
