Radiation imagery chemistry: process – composition – or product th – Stripping process or element – Forming composite image – e.g. – multiple stripped image...
Patent
1989-09-14
1991-10-01
Bowers, Jr., Charles L.
Radiation imagery chemistry: process, composition, or product th
Stripping process or element
Forming composite image, e.g., multiple stripped image...
430256, 430291, G03C 1112
Patent
active
050533134
DESCRIPTION:
BRIEF SUMMARY
PRIORITY
This application draws priority from German Application P 37 08 586.7 filed Mar. 17, 1987, and from PCT/EP 88/00211, filed Mar. 16, 1988, which are incorporated herein by reference.
The present invention relates to a method and means for carrying out pre-press or off-press color proofing procedures for color printing, wherein at least one photosensitive film is laminated onto a substrate or receptor, exposed to light, and toned or colored with a dry toner.
Such pre-press color proofing procedures for color printing are to an increasing extent displacing the classical proof print (i.e., press proof) in gravure and offset printing. With press proofs there are many factors which affect the print and have to be adjusted to each other. Pre-press color proofing systems require only two factors to be standardized and controlled, i.e., the time of exposure and the process of applying pigment (toner).
These pre-press color proofing systems permit a valid determination to be made as to whether the color separation transparencies (films) are in the optimum condition and which corrections have to be made. In addition, the color proof (test print) is available faster. However, the automatic transportation of the color proof substrate through an automatic toning device demands higher stability than that inherent in the normal paper substrates intended to be used for the final press print. Thus, the proofing procedure is conventionally carried out using a cardboard support instead of the paper that will actually be used in the press print. As a matter of fact, however, such a cardboard support frequently causes the pre-press proof to have a better appearance than will result from the subsequent press printing procedure.
Therefore, many attempts have been made to combine the paper intended to be used for the final press print with a stable support/cardboard. This combination of paper and support is used during the processing from the time the photosensitive film is laminated to a receptor until the film/receptor has passed through the automatic toning apparatus. However, once this procedure is finished, it must be possible to readily remove the paper (with the attached image-bearing film), damage-free, from the support/cardboard. Attempts using support/cardboards having a coating of an adhesive with low adhesive power have not proven to be successful and feasible, since variations in the adhesive power, and in the resistance of the paper to pulling, have again and again caused failures to occur. In practice, attempts were made to remedy this problem by coating the edges of the support/cardboard with a sizing or glue, or by bonding the paper intended to be used for the final press print onto the cardboard using double-sided adhesive tape. This manual step and, above all, the unsteady securing of registration during multiple color transfers are disadvantages of this method.
It is the object of the invention to develop a method and means for carrying out pre-press color proofing processes for color printing, wherein at least one photosensitive film is laminated onto a substrate, exposed to light, and toned or colored with a dry toner, and to permit a sample of the paper intended to be used for the final press print to be used as the film substrate. More particularly, it is intended that the process and product will be as acceptable technically as when a stable support/cardboard is used as the substrate.
This object can be attained in a surprisingly simple way by applying an interlayer to the reverse side of a sample of the paper intended to be used for the final press print. This interlayer must permit the paper to be stripped, without damage, from the shape-stable and dimensionally stable support.
Thus, the means comprise: which paper has been pre-treated in advance on the reverse side as defined herein, and, pre-treated as defined herein, to the surface of which said paper has been removably applied.
The reverse side of the paper intended to be used for the final press print is pre-treated in a defined manner, fo
REFERENCES:
patent: 3156565 (1962-09-01), Sinclair
patent: 3649268 (1972-03-01), Chu et al.
patent: 4329420 (1982-05-01), Bopp
patent: 4461822 (1984-07-01), Abele
patent: 4921776 (1990-05-01), Taylor, Jr.
Bowers Jr. Charles L.
Chu John S. Y.
E. I. du Pont de Nemours & Company
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