Process for producing color cards

Details Process for producing color cards Process for producing color cards

1995-12-14

1998-03-17

Dudash, Diana

Coating processes

Nonuniform coating

Paper or textile base

427286, 427378, 427382, 427493, 427510, 427542, B29C 7102, B05D 304, B05D 306, B05D 500

Patent

active

057284270

DESCRIPTION:

BRIEF SUMMARY
The invention relates to a process for producing colour cards. More particularly, it relates to a process for producing colour cards with water-based lacquers.
Colour cards are well known in the paint business. They generally consist of sheets of cardboard or of paper, on which samples of the various paint colours are applied (often in the form of small rectangles arranged according to a geometrical pattern).
The easiest but most time-consuming process is to apply each colour on a large piece of cardboard or of paper which is then cut into small pieces, one of which is attached on each colour card.
It has long been preferred to use whenever possible a process for applying several colours simultaneously, three of which are currently used: spraying-guns, each filled with a different colour, one can apply several colours in one passage; simultaneously on a sheet; of paper in a continuous process.
Mainly one type of paint is used for producing colour cards, namely nitrocellulose paint (even for colour cards relating to other types of paints). The nitrocellulose used as binder is dissolved in volatile solvents, in order to ensure quick drying of the paint film under (heated) air flow. For example, roller application can be used with a paper speed of up to about 35 m/min without problem as to drying speed.
Worldwide concern for the environment has now led to a desire for reducing the emission of volatile organic compounds. There is thus a need in the art for colour card lacquers causing the emission of less or no volatile organic compounds, and the Applicants have now developed a water-based emulsion paint suitable for this application. However, the drying of water-based is too slow (in the above example, not more than about 6 m/min), even when using warm-air drying.
It is thus an object of this invention to provide a process for producing colour cards with water-based lacquers at increased rate of production.
Another object of the invention is to provide a process for increasing the drying speed of colour cards prepared with water-based lacquers.
Yet another object of the invention is to provide a process for uniformly drying areas of different colours on colour cards prepared with water-based lacquers.
Still another object of the invention is to provide for the use of water-based lacquer compositions for producing colour cards using cardboard or paper substrates.
U.S. Pat. No. 2,321,938A discloses a coating process wherein a fibrous product coated on one side (or on both sides) is conveyed into a drier comprising one bank of infra-red lamps facing the coated surface (or two banks located respectively above and beneath said product).
FR-883712-A discloses a printing process wherein infra-red rays and air blowing are used in such a way as to act both on the printed side of the substrate. In the introduction, there is acknowledged as prior art a process for drying a printed transparent surface by heating the reverse face thereof using infra-red rays.
In accordance with the invention, there is provided a process for producing colour cards with lacquers comprising the steps of: side of said substrate; and irradiating the uncoated side of said substrate.
There is also provided a process for drying colour cards prepared with water-based emulsion paints applied in layers of at least 75 g/m.sup.2, comprising using infra-red dryers to irradiate the uncoated side of the cards.
The invention further provides for the use of infra-red dryers to dry wet colour cards prepared with water-based emulsion paints in layers of at least 75 g/m.sup.2 by irradiation of the uncoated side of the cards.
The cardboard or paper substrate to be used in the process of the invention is known in the art and need not be described here; it is normally white. Glossy paper, as used in the graphic industry is preferred. As examples of substrates that can be used, one can cite Bristol board, Chromolux paper, Invercoat paper, Machine coated paper and Writing paper. The thickness of the paper should be sufficient as to prevent any background colour to

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S. Knoedler, Possibilities and limits of water colors in packaging printing, Jul. 20,1981, p. 634, Chemical Abstracts, vol. 95, No. 3.

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