Mead process:- Explained in brief
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Mead process:-
A recent development in colour photocopying which does not employ electrostatic attraction of toners has been described. The method makes use of microcapsules containing, in addition to a colour former, a monomer and a photosensitive initiator. By suitable choice of initiators the capsules can be made sensitive to blue (420 nm), green (550 nm) or red (650 nm) radiation. After exposure, the cores of those capsules which have been polymerised do not release their colour former when subject to pressure. By coating a paper with all three types of capsule and exposing under a transparent document, or under a transmissive liquid crystal display, a latent colour image is produced. This image is then placed in face-to-face contact with an acidified clay coated layer and squeezed through the nip of pressure rollers to produce a final colour print on the clay-coated layer.
