Simplified process and apparatus for making plates used in printing
OwnerChin-Shiung Fanginventor
Life of this patent
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Abstract
A simplified process for making plates used in printing, including forming a chemically positive copy on a transparent or translucent sheet-like structure with the lines thereon being constituted of artificial powder without going through the steps of photographing and contact copying. The copy so formed may be directly used in retouching and then plate processing. This process does not require the use of photosensitive films and chemical photograhing so that the speed of making plates is increased and damage to the environment decreased.
Claims13
A simplified plate making process which does not require the steps of photographing and contact copying, said process comprising the following steps of:
- (a) directly forming, in a physical way, a positive copy on a transparent or translucent sheet-like structure wherein lines thereon are constituted by artificial powder;
- (b) retouching and securing at least one said positive copy on a plate;
- (c) exposing said plate with said positive copy thereon onto a photosensitive plate;
- and
- (d) exposing and developing said photosensitive plate.
An apparatus which forms a positive copy constituted by artificial powder on a transparent or translucent sheet-like structure without going through the step of contact copying, said apparatus comprising:
- a transparent plate for holding a copy to be printed;
- a photosensitive element connected to a power supply device for supplying negative high voltage direct current power to said photosensitive element carrying artificial powder after exposure;
- an odd number of reflective lenses arranged between said transparent plate and said photosensitive element;
- an exposure device for supplying light to said photosensitive elements, wherein said exposure device has exposure power of over 300 watts;
- a feeding device for feeding said sheet-like structure to get into contact with said photosensitive element for transfer printing;
- a separation device for separating said sheet-like structure from said photosensitive element after transfer printing by means of an alternative current high voltage;
- a fixing device having a heating device and a pressure roller for fixing an image transfer-printed on said sheet-like structure;
- a power source for supplying power to said exposure device, said feeding device, said separation device and said fixing device, and supplying said negative high voltage direct current power required by said photosensitive element.
Dependencies are inferred from the claim text.