Recorders – Performance of multiple functions of steam and gas engines – Pressure responsive element
Patent
1988-03-23
1990-04-03
Hartary, Joseph W.
Recorders
Performance of multiple functions of steam and gas engines
Pressure responsive element
346 25, 3461351, 346140R, G01D 1534, B41J 304
Patent
active
049144510
ABSTRACT:
A method of printing on an ink receptive coating (12) which enhances the density of images printed on non-ink receptive substrates (10) by ink-jet techniques is provided. The substrates, such as transparent polyester films, are coated with a layer of an material to a thickness which promotes controlled latent lateral diffusion of the printed ink dots (14a-c). The lateral diffusion is microscopically observed to begin immediately after printing, eventually ceasing as the vehicle of the ink is sufficiently spread and evaporated by the lateral spreading. The optical density of the image increases as the ink diffuses, reaching a maximum density that is considerably greater than otherwise possible without such an ink-coating system and avoids the undesirable surface coalescence of drops (14) which causes a puddled appearance in films not employing latent spreading. Sheets of such printed imaged media are stored in removable sheet protectors of a vapor permeable, water absorbent material such as cellulose acetate, such that dot spread is controlled within the teachings of the invention.
REFERENCES:
patent: 4503111 (1985-03-01), Jaeger
patent: 4521785 (1985-06-01), Matsufujii
patent: 4701837 (1987-10-01), Sakaki
patent: 4733247 (1988-03-01), Arai
Titterington et al; Development of a Transparent Receiving Sheet For Ink-Jet Printing; Journal of Imaging Science, vol. 30, No. 1 J/F 1986, pp. 4-8.
Hickman Mark S.
Morris Peter C.
Hartary Joseph W.
Hewlett--Packard Company
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