| 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 in k filling an electrode gap defined between a positive electrode and a pluralit y of negative electrodes. The improvement comprises applying to selected negative electrodes a trigger signal of a voltage sufficient to energize same and cau se point-by-point selective coagulation and adherence of the colloid onto the positive electrode surface opposite the surfaces of the energized electrodes . The trigger signal comprises at least two consecutive pulses having the aforesai d 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 into the positive electrode surface and forming each dot of colored, coagulated colloid, without causing undesirable gas generation at the negative electrodes, thereby increasing the optical densit y of each dot and of the resulting image.
|
