Cover film for color hard copy printing paper

Details Cover film for color hard copy printing paper Cover film for color hard copy printing paper

1983-10-31

1985-06-11

Hess, Bruce H.

Stock material or miscellaneous articles

Web or sheet containing structurally defined element or...

Physical dimension specified

8471, 428480, 428481, 428514, 428522, 4285375, 428913, 428914, 430961, B41M 526

Patent

active

045228817

DESCRIPTION:

BRIEF SUMMARY
TECHNICAL FIELD

The present invention relates to a transferable cover film to a color hard copy printing paper by which a colorless and transparent protective layer can be easily formed on the surface of a printing paper on which a color print is made.


BACKGROUND ART

It is possible that a dye carrier paper formed by coating thereon an ink containing a sublimation dye is heated by a thermal print head and then the dye of a necessary portion is selectively transferred to make a color picture on a printing paper. The picture thus formed has, however, the following problems. Since the dye thus transferred is adsorbed on the surface of the printing paper but not diffused well, a part thereof remains as aggregation substance and hence it does not present its inherent color. Therefore, after printing, the printing paper has to be heated again to thereby perform the thermal diffusion of the dye into the printing paper. Moreover, there is such a defect that the dye thus transferred is apt to be faded by, for example, oil and others soaked thereto from hands and also is easily faded by ultraviolet rays contained in natural light. To overcome these defects, it was considered that a protective film made of polyester film or the like with a thin heat melting layer bonded on its one surface was attached to the printing paper by heating. However, in the color copy having the protective film formed thereon, since its protective film is expanded and/or shrinked by heat generated upon bonding, the product thereof is considerably curled and also the fading preventing effect of the dye is not sufficient. The result of investigation reveals that in order to provide the protective layer resulting in a small curl when provided with the printing paper, it is preferred that the thickness of the resin layer is selected to be lower than 20 .mu.m. If the protective layer has the thickness larger than the above value, the curl becomes large and the commercial value is lowered greatly. Moreover, in order to form the uniform protective layer well, a resin layer having a thickness of at least 1 .mu.m is necessary. There is, however, a great deal of difficulty that such thin film is bonded by heating to the color copy without being wrinkled.


DISCLOSURE OF INVENTION

The present invention is to provide a cover film for a color hard copy printing paper which can solve the above problems.
The present invention is to provide a cover film for a color hard copy printing paper by which a protective layer avoiding a color fading property and having a less curl can be formed on a surface of a color copy transferred and dyed on a printing paper from a dye carrier paper made by using sublimation dye, by thermally pressing a thin transparent resin film, which does not pass therethrough ultraviolet rays, from a base material having thickness and strength for easy handling. According to the present invention, the cover film is formed of a heat-resistant base material and a colorless and transparent cover material layer, having no adhesive property to the base material, containing a layer preventing the ultraviolet rays and being molten and then transferred to the surface of a printing paper by heating, which is formed on the base material.
FIGS. 1 to 4 are diagrams each showing the structure of a transferable cover film according to the present invention. In the figures, reference character (A) designates a plastic film base material exemplified by polyester, polycarbonate, polyacrylate or the like whose surface is smoothed or subjected to crape treatment and releasing treatment, if necessary and which has relatively heat-resistant property. A base (D) is such a base having a higher smoothness formed by superposing the same film as above on one surface of a paper (D') or coating thereon a cross-linking resin having heat-resistant property (for example, silicone resin, unsaturated polyester resin and so on) (D"). The thickness of the bases (A) and (D) is preferably selected to be less than 100 .mu.m. This value is selected in view of the easy hand

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patent: 2824080 (1958-02-01), Haux
patent: 3309220 (1967-03-01), Osteen
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patent: 4272292 (1981-06-01), Mizuno
patent: 4362529 (1982-12-01), Mizuno et al.
patent: 4367071 (1983-01-01), Mizuno et al.
patent: 4424691 (1984-01-01), Mizuno et al.
patent: 4472491 (1984-09-01), Wiedemann

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