Record receiver having plural interactive leaves or a colorless – Having plural interactive leaves
Patent
1990-06-29
1992-10-27
Hess, B. Hamilton
Record receiver having plural interactive leaves or a colorless
Having plural interactive leaves
428195, 428212, 428913, 428914, B41M 5035, B41M 526
Patent
active
051589290
DESCRIPTION:
BRIEF SUMMARY
The invention is directed to an inking ribbon for a transfer printing process, whereby colorant components are transferred from a carrier film onto a material to be printed, particularly paper, due to designational action of radiation and/or heat.
Such printing processes are employed, for example, in thermographic printers. Printer inks for inking ribbons that are already known are composed of a wax that contains the colorant and a bonding agent. This wax is applied on a carrier that is usually composed of a flexible plastic film, for example of polybutylene terephthalate. An aluminum layer can also be present between the film and wax layer for better thermoconduction. The inking ribbons for the printers are manufactured from films coated in this way.
In the printing process that is also referred to as release technique, a printing head that, for example, can be composed of a plurality of heatable elements arranged in the form of a matrix, transfers a defined quantity of heat onto the inking ribbon via these elements. As a result thereof, the wax is melted and is transferred onto the medium to be printed, particularly paper, by the pressure simultaneously applied The wax layer that contains the colorant and is transferred onto the paper is thereby relatively thick. Although a good color saturation is achieved as a result thereof that is also independent of the surface of the paper, the adhesion of the colorant to the paper and, as a consequence, the resistance to abrasion is still capable of great improvement in this technology.
Given increasing printing speed, the multi-layer structure of the described inking ribbon is also disadvantageous. The wax layer must be melted during printing and therefore, just like all the other layers, consumes a certain heating capacity that limits the maximally obtainable printing speed. The mechanical stressing of the inking ribbons also only allows a certain printing speed.
Moreover, the "thermal efficiency" in thermographic printers having traditional printer ink compositions amounts to only about 5% based on a rough estimate. This means that about 95% of the heating capacity exerted is lost as dissipated heat and can no longer be directly utilized for the color transfer.
It is therefore an object of the present invention to specify an inking ribbon for transfer printing processes that exhibits a good color saturation on, for example, paper, improved printing quality given good color adhesion and high resistance to abrasion of the inking ribbon and that also requires less heating capacity for the color transfer.
This object is inventively achieved by an inking ribbon of the species initially cited in that at least the colorant is chemically bonded to or in a carrier phase on the carrier film in labile fashion, this chemically decomposing due to the action of radiation and/or heat, whereby this is converted into a mobile phase and is transferred onto the material to be printed. It also lies within the scope of the invention that, in the preliminary stage, the at least one releasable ink constituent or the colorant is bonded via a labile group upon whose decomposition a gaseous compound is also released in addition to the released in addition to the ink constituent. Further developments of the invention are provided by an inking ribbon in which at least one ink constituent in releasable by radiation and/or heat or the colorant is bonded in the carrier phase via a labile group upon whose decomposition a gaseous compound is additionally released. The inking ribbon has at least the colorant being chemically bonded to a carrier polymer in labile fashion. Such inking ribbon preferably has the carrier polymer ;simultaneously representing the carrier film of the inking ribbon.
The inking ribbon of the present invention provides that, given the chemical decomposition of the carrier phase, at least one ink constituent that is liquid under the given conditions is released that represents a solvent for the further ink constituents to be transferred. The inking ribbon includes the carr
REFERENCES:
patent: 4619665 (1986-10-01), Sideman et al.
Abstract from the Third International Conference on Unconventional Photoactive Solids, Oct. 11-15, 1987.
Dorner Barbara
Grethen Hartmut
Nuyken Oskar
Pekruhn Wolfgang
Quella Ferdinand
Hess B. Hamilton
Mannesmann AG
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