Improvements in and Connected with Superficially Coloured Paper, Carboard, and Similar Materials.
Year: 1897

page_text: COMPLETE SPECIFICATION.
Improvements in and Connected with Superficially Coloured Paper,
Carboard, and Similar Materials.
I, CARL HERMANN VOIGT, Chemist, of Zschochersche Strasse 31b, Leipzig-
Plagwitz, in the Kingdom of Saxony, do hereby declare the nature of this invention
and in what manner the same is to be performed to be particularly described and
ascertained in and by the following statement: -
This invention relates to the production of coloured films or coats on paper
cardboard and pasteboard, intended for the manufacture of cardboard-boxes,
or for typographic or lithographic printing, chromo-printing, or embossing..
Hitherto such films have been produced by means of pigments and a binding
material or size consisting mainly of glue, to which starch or dextrine is sometimes
added for reasons of economy.
Such films cannot, however, be applied directly to unsized paper or cardboard,
a preliminary sizing of the same is necessary, and if the coloured paper or cardboard
is to serve as a base for many-coloured prints, only two colours can be conveniently
printed on it in one day. My invention has for its object, to avoid the preliminary
sizing and to provide a coloured film which has a greater power of absorption,
than those prepared with glue in the ordinary way, so that from 4 to 6 coloured
impressions may be applied to the same sheet in one day.
For this purpose I mix the colouring matter or pigment with a binding substance
consisting (instead of glue) of a mixture of suitable vegetable matter and chemicals,
prepared in the following manner:-
About 100 parts of starch or other carbo-hydrates, or of mucilaginous vegetable
matter, such as agar-agar or carragheen, and about 2 per cent. of solid alkali-
hydrate are mixed with 300 to 500 parts of water and subjected to pressure at
a temperature ranging from 110 to 200 degrees Centigrade, until a uniform mass
has been produced. Subsequently opaque or transparent colouring matters are
added according to requirements, and if necessary, a suitable quantity of wax and
soan, and the whole is intimately mixed.
The colour-paste or coating material thus obtained may be applied to the sheets
of unsized paper or cardboard, without any preliminary sizing, and the coloured or
variegated paper, cardboard, or paste-board coated with the same possesses as
regards appearance and durability all the good qualities of paper and cardboard
provided with coloured films in the ordinary manner.
Having now particularly described and ascertained the nature of this Inven-
tion and in what manner the same is to be performed, I declare that what I
claim is:
1. The improvement in the production of a coloured film or coating on paper,
cardboard and similar material, which consists in substituting for the animal size
usually employed a binding substance prepared from starch or other carbo-hydrates
er mucilaginous vegetable matter, solid alkali-hydrate and water, substantially

page_text: as described, and applying the coating or film without preliminary sizing of the
paper or other base.
2. As a new article of manufacture, sheets of paper, cardboard, or similar material,
having a coloured film mainly composed of colouring matter and a binding sub-
stance prepared as described.
Dated this 10th dow of Mo
100%
FAIRFAX & WETTER,
37 and 39, Essex Street, Strand, London, Agents.