B - Operations – Transporting – 41 – M
Patent
B - Operations, Transporting
41
M
42/6
B41M 5/40 (2006.01) B41C 1/10 (2006.01)
Patent
CA 2027332
To compensate for tolerances and variations in tolerances in a recording system in which a thermo transfer foil is passed between a recording head (3) and a forme substrate (1), the thermo 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 exapandable, 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 of up to about 1 mm, thus, can be compensated for and pressure variations and surface variations between the thermo recording head (3) and the forme substrate (1) are no longer critical. The accuracy and sharpness of transfer of meltable particles from the meltable layer (7) to the forme (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).
Manroland Ag
Ridout & Maybee Llp
LandOfFree
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