Printing apparatus with thermo transfer foil capable of compensa

Details Printing apparatus with thermo transfer foil capable of compensa Printing apparatus with thermo transfer foil capable of compensa

1992-09-11

1995-01-17

Fuller, Benjamin R.

Recorders

Thermal recording

101467, 101465, 101466, 1014631, B41C 1005, B41C 106, B41J 2325

Patent

active

053829646

ABSTRACT:
To compensate for tolerances and variations in tolerances in a recording system in which a thermal transfer foil is passed between a image recording element (3) and a printing form carrier (1), the thermal transfer foil, for example of a polyester base (9), has an intermediate layer (8) applied thereto on which a meltable substance layer (7, 7'), for example on a polyethylene base, is located. The intermediate layer (8) is thermally volume expandable, by including therein either a foaming agent or moisture or other gas which, upon application of heat, causes foaming or the formation of gas or steam bubbles to expand its volume. Tolerances 6 of up to about 1 mm, thus, can be compensated and pressure variations and surface variations between the thermal image recording element (3) and the form carrier (1) are no longer critical. The accuracy and sharpness of transfer of meltable particles from the meltable layer (7) to the form (1) is not affected by the presence of the thermally expandable layer which, upon influence of heat, will expand only after the meltable substance has melted, due to a selection of thermal expansion material, for example foaming agent, which has a threshold or foaming temperature higher than the melting temperature of the meltable substance (7).

REFERENCES:
patent: 4565737 (1986-01-01), Nishide
patent: 4897310 (1990-01-01), Beyer et al.
patent: 4958564 (1990-09-01), Fuhrmann et al.
patent: 5002819 (1991-03-01), Tohma et al.
patent: 5072671 (1991-12-01), Schneider et al.
patent: 5191834 (1993-03-01), Fuhrmann et al.
Benning, "Plastic Foams, vol. 2, " Wiley: New York: 1969 pp. 39-41.

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