Improvements relating to the Manufacture of Embossed Sheet Metal Advertising Tablets or Signs.
Year: 1892

page_text: Date of Application, 19th Jan., 1892-Accepted, 20th Feb., 1892
CODE DEIN SPECIFICATION.
Improvements relating to the Manufacture of Embossed Sheet Metal
Advertising Tablets or Signs.
We FRANZ THEODOR ERWIN HEYNE and FRIEDRICH GUSTAV SCHREIBER
both of Dresden Saxony in the Empire of Germany Manufacturers 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:-
The object of this invention is to produce embossed sheet metal advertising
tablets or signs, with claborate designs in various colors, in a simple and more
economical manner than heretofore, and the invention consists in the mode of
producing such tablets, and in the means employed for carrying out the same.
According to our invention, we take the thin metal plate which is to be employed
for the tablet, and having properly cleaned and prepared it, we print thereon, in
the usual way, in a lithographic press, and in the desired colors, the design or
advertisement, and the printed plate is then dried in an oven.
It will thus be seen, that the advertisements may be of most elaborate designs,
and contain coats of arms, representations of men or animals, or the articles to
which the advertisement is to apply; views of places, or any other ornamentation,
and that the whole design is produced or printed directly onto the plate, instead
of coloring the embossed portions only by means of transfers, or by means of
rollers and stencils, as heretofore.
The stamping up or embossing of the required parts is next effected in a special
manner, and by special means, as will now be described.
It will be evident that, to effect the embossing, a punch or die, and a counterpart
or matrix, must be employed, and that the matrix must, by reason of the plate
being printed in color before it is embossed, be so produced that while it shall
possess adequate resistance to the die, it shall also possess such an amount of
ductility and impressibility, as not to injure the coloring on the plate during the
embossing operation.
To produce the die or punch, we print, in any convenient manner, onto a stout
brass plate, the general outline of the devices, designs, figures, or letters, and we
then cut or punch these devices from the brass plate.
-
These pieces of brass of irregular shape we then attach, in their proper order,
by soldering, or in any other convenient manner, to a metal plate, preferably
of zinc.
To produce the matrix or counterpart, we take a sheet of stout pasteboard, and
we apply thereto, in several coats, and to a thickness of several millimeters, a com-
position consisting of gypsum, a solution of gum arabic, and boiled wood pulp
(pappspähnen) mixed together in a hot state.
When dry, we press into the coating the relief die or punch, and to the counter-
part thus produced, we apply a thinner coating of another composition, consisting
of whiting, boiled wood pulp (pappspähnen), gluc, and ox-gall, in a warm state,
and before it gets cold, we again press in the die or punch.
The matrix will thus be completed, and after standing for about 24 hours to dry
and harden, it will be ready for use in the embossing of the printed metal tablets or
plates, which will be effected in any convenient construction of press in the
sual way.
In preparing the compositions above mentioned, we prefer to proceed as
follows: (1) Take boiled wood pulp (pappspähnen) and gypsum in equal
quantities; mix them well together, and then add a hot solution of gum arabic in
Sufficient quantity to produce a thin batter, or, in other words, until a thick liquor

page_text: results. (2) Take whiting and wood pulp (pappspähnen) in equal proportions,
mix them well together, and then stir in a solution of glue, until a thickish liquor
results. Then add a small quantity of ox-gall to prevent burning, and boil up.
We may remark that we have found the materials and proportions above men-
tioned to answer the object we have in view, namely, to produce a matrix that will
have sufficient elasticity not to injure the colored surface, and will also sufficiently
resist the pressure exerted by the die, but we do not wish to. confine ourselves
exactly to such materials or proportions, as there may obviously be equivalent
materials which may serve the purposes of our invention.
The plates will be varnished in the usual way.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
1. The mode herein described of producing embossed sheet metal advertising
tablets or signs, having more or less elaborate designs in various colors, and con-
sisting in first printing the design in the various colors on the flat sheet of metal,
and then subjecting the printed plate to pressure between a metal die and a
counterpart possessing sufficient strength to maintain its form under pressure,
without injury to the printed surface of the plate, as set forth.
2. The means herein described for producing embossed metal advertising tablets,
and consisting of a die formed with metal letters, figures, etc., attached to a metal
plate, in combination with a counterpart or matrix formed by impressing said die
into a yielding surface spread upon a suitable carrier or base, said yielding surface
consisting of compositions prepared, in the manner above set forth, from two or
more of the following ingredients, namely, gypsum, glue, oxgall, gum arabic,
whiting, and wood pulp (pappspänen), in or about the proportions given.
3. A matrix or counterpart to be used in producing embossed metal advertising
tablets, consisting of a sheet of pasteboard or other suitable carrier covered with
a thick coating of a hot composition of boiled wood pulp (pappspähnen), gypsum,
and a solution of gum arabic, and a second coating of a hot composition of whiting,
wood pulp (papps pähnen), and a solution of glue which has been boiled, each
coating receiving an impression from a metal dic, as and for the purpose set forth.
Dated this 19th day of January 1892.
NEWTON & SON,
Agents for the Applicants.