Coating processes – Transfer or copy sheet making – Decal or embossing foil type
Patent
1991-04-25
1994-06-21
Robinson, Ellis P.
Coating processes
Transfer or copy sheet making
Decal or embossing foil type
156 622, 156230, 156231, 156237, 427146, 427152, 427153, 427155, 427160, 4272088, 4272084, 428 40, 428195, 428354, 428355, 428914, B41M 312
Patent
active
053227085
DESCRIPTION:
BRIEF SUMMARY
The invention concerns a self-adhesive dry-transfer decal, the procedure for its manufacture and application.
These dry-transfer decals have already been described in EP-A-0043578 and AT-B-347483, the first of which shows decals where two, three or more layers, starting with the carrier varnish and at least one color and an adhesive, are applied to one or more siliconized papers, and then covered by one or more release papers. It is said, the layers can be done in reverse order, too. More detailed information concerning the type of paper and the various layer materials is not given, and it has been proved that, without a definite and specific selection of the materials used in manufacturing dry-transfer decals, a successful manufacturing is not possible.
AT-B-347483 describes a procedure for manufacturing letterings for wreath ribbons in a screen printing process in the form of a dry-transfer decal on siliconized or waxed carrier paper, by which first a transparent protective varnish, then a color layer and finally an adhesive layer are applied, finally covered with a siliconized or waxed paper.
Similar dry-transfer decals composed of at least one release paper, at least one adhesive layer, at least one color layer, where applicable one carrier varnish layer, and at least one siliconized paper layer, are also described in U.S. Pat. No. 2,647,849. Also, from this technical state of art, it cannot be determined what the exact composition of the layers should be to obtain optimal properties for manufacturing, handling, storage and takeoff which guarantees use of this dry-transfer decal also in humid-torrid climates or under nordic-frosty winter temperatures, to apply with this dry-transfer decal decorative images or markings, for instance letterings or pictograms, preferably onto showroom windows but also to other background materials with up to a medium rough or textile surfaces.
The tasks to be solved by the invention are: quantities and sizes and in high production speeds, can be stored in stacks, moved, easily handled and finally be applied to a multitude of background materials without having the images or decals being printed onto film materials; viewer; materials under normal weather conditions such as sun, rain and cold, do not crack, and adapt themselves through their elasticity to weather- or climate-related changes in the background materials; showroom window, and can be seen equally colored under daylight from either outside or inside; window pane; also to round, convex, concave or uneven consumer goods packings.
These tasks will be solved using a well-known layer structure, whereby the composition of layers is selected such to achieve certain peeling and release values, which will guarantee not only successful function for mass-production, storage and transportation as well as under varying climatic conditions, but also high production speeds and certain handling characteristics.
Accordingly, the carrier paper (no. 5 in FIG. 1) and the release paper (no. 1 in FIG. 1) will be selected such to prove a release value of 50 to 80 cN, measured with TESA-tape K7476, 20 mm width, tested for 24 hours at 40.degree. C., for the carrier paper, and a release value of 15 to 35 cN under the same conditions for the release paper.
For the color layer (no. 3 in FIG. 1), a colorful, well covering paint is used which, in its physically drying version, can be printed at a speed of minimum 2,000 sheets per hour, and in its ultraviolet hardenable version at a speed of approx. 7,200 sheets per hour, both on a siliconized carrier paper (no. 5 in FIG. 1), wherby the color layer is congruent in outline and dimension with the image or picture being reproduced and adheres to the carrier paper with a release value of approx. 8 to 12 cN, measured with TESA-tape 651, 20 mm width, measure range 2 N, tear-off speed 500 mm/min. After the drying process the elasticity of the color layer must be maintained, unimportant whether screen printing, off-set printing or a spraying process and whether one or more layers are used.
As a color
REFERENCES:
patent: 2647849 (1953-08-01), Douglas et al.
patent: 3543920 (1970-12-01), Crocker
patent: 4684420 (1987-08-01), Bryant
patent: 4762680 (1988-08-01), Pennace
patent: 4766038 (1988-08-01), De Vroom
patent: 4771891 (1988-09-01), Sorensen
patent: 4786537 (1988-11-01), Sasaki
Ahmad Nasser
Robinson Ellis P.
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