IMPROVEMENTS IN COVERS FOR INKROLLERS FOR LITHOGRAPHIC PRINTING
Year: 1879

page_text: LETTERS PATENT to John Albert Reinhold Hildebrandt, Civil Engineer, of the
Firm of A. Hildebrandt, Patent Agent, Barlows Court, 43, Market Street, in
the City of Manchester, in the County of Lancaster, for the Invention of
"IMPROVEMENTS IN COVERS FOR INKROLLERS FOR LITHOGRAPHIC PRINTING."
A communication from abroad by Pierre Gripekoren, Rudolph Gripekoren,
Auguste Gripekoren, and Wilhelmine Frank-Mann, all of Brussels, in Belgium.
PROVISIONAL SPECIFICATION left by the said John Albert Reinhold
Hildebrandt at the Office of the Commissioners of Patents on the 5th
September 1879.
JOHN ALBERT REINHOLD HILDEBRANDT, Civil Engineer, of the Firm of A. Hilde-
brandt, Patent Agent, Barlows Court, 43, Market Str., in the City of Manchester,
in the County of Lancaster. "IMPROVEMENTS IN COVERS FOR INK-ROLLERS FOR
LITHOGRAPHIC PRINTING." A communication from abroad by Pierre Gripekoren,
Rudolph Gripekoren, Auguste Gripekoren, and Wilhelmine Frank-Mann, all of
Brussels, in Belgium.
The following are the ingredients of which the composition for the improved ink-
roller cover for lithographic printing is composed :-Twenty parts of syrup, twenty
parts of glue, three parts of saltpetre, three parts of sugar, five parts of water, one
part of oil of almonds, one part of chromyellow, also some sulphate of alumina and
some potash.
To mix the first named seven ingredients so as to unite them into a solid body
the following process is adopted-The said seven first named ingredients are dis-
solved over a vessel of hot water or in a steam bath until they are completely melted
and mixed. While the mixture thus produced is still hot it is poured into a cylin-
drical case or mould into which a core (usually of wood) has been placed which is
about three eighths of an inch (more or less) smaller in diameter than the space in
the mould, so that it leaves a space all round. When the mixture has become
properly cold and solidified the core is withdrawn from the mould.
In order to give
to the composition the qualities of leather, that is to say, to make it impervious to
water, it is immersed for about ten hours in a bath composed of one part of sulphate
of alumina, one part of potash, and ten parts of water properly mixed, and then
dried in the air. After a lapse of 4 or 5 days a skin is formed on the surface of
the composition which is stiff and quite impervious to water. The covers produced
in this manner have the advantage that in consequence of their elasticity the rollers
covered with it are more conveniently handled than has hitherto been the case, and
from their smooth and adhesive surface produce a sharper and more covered letter
or drawing from the stone, and are more durable.

page_text: 51
SPECIFICATION in pursuance of the conditions of the Letters Patent, and of an
Order of the Lord Chancellor, filed by the said John Albert Reinhold Hilde-
brandt in the Great Seal Patent Office on the 12th March 1880.
JOHN ALBERT REINHOLD HILDEBRANDT, Civil Engineer, of the Firm of A.
Hildebrandt, Patent Agent, Barlows Court, 43, Market Strect, in the City of
Manchester, in the County of Lancaster. "IMPROVEMENTS IN COVERS FOR INK-
ROLLERS FOR LITHOGRAPHIC PRINTING." A communication from abroad by Pierre
Gripekoren, Rudolph Gripekoren, Auguste Gripekoren, and Wilhelmine Frank-
Mann, all of Brussels, in Belgium.
The following are the ingredients of which the composition for the improved ink
roller cover for lithographic printing art is composed.
Twenty parts of syrup, 20 parts of glue, 3 parts of saltpetre, 3 parts of sugar, 5
parts of water, 1 part of oil of almond, 1 part of chrom yellow, also some sulphate
of alumina and some potash.
To mix the first named seven ingredients so as to unite them into a solid body
the following process is adopted :-The said seven first named ingredients are melted
down over a vessel of hot water or in a steam-bath until they ar completely dis
solved; while the mixture thus produced is still hot it is poured into a cylindrical
case or mould into which a cone has been placed (usually of wood) which is about
3/8 of an inch (more or less) sinaller in diameter than the space in the inould, so that
it leaves a space all round. When the mixture as become properly solidified the
cone is withdrawn from the mould. In order to give to the composition the
qualities of leather, that is to say, to make it impervious to water, it is immersed
for about 10 hours in a bath composed of one part of sulphate of alumina, one part of
potash, and ten parts of water properly mixed and then dried in the air.
After a
Japse of 4 or 5 days a skin is formed on the surface of the composition which
is stiff and quite impervious to water.
1.
The covers produced in this manner have the advantage that in consequence of
their elasticity the rollers covered with it are more conveniently handled than has
hitherto been the case, and from their smooth and adhesive surface produce a sharper
and more covered letter or drawing from the stone, and are more durable.
DESCRIPTION OF THE DRAWING.
The accompanying Drawing illustrates a lithographic ink-roller covered with the
improved composition, Fig. 1 being a side view, Fig. 2 an end view, Fig. 3 a longi-
tudinal section, and Fig. 4 a cross section of the roller.
B is the body of the roller with handles, and A is the cover made of the improved
composition, and having a thickness of about a quarter of an inch, and a are shoulders
against which the cover forms a finish.
Having now particularly described the Invention, and ascertained in what manner
the same may be carried into practice, I desire it to be understood that I do not
limit myself to the exact details given for the purpose of description, but claim as
my Invention substantially,-
The production of covers for lithographic printing rollers and for other purposes
from syrup, saltpetre, sugar, water, oil of almonds, chrom yellow, and glue, with or
without a surface produced by sulphate of alumina, potash, and water, substantially
as described.
In witness whereof, I, the said John Albert Reinhold Hildebrandt, have here-
J. A. R. HILDEBRANDT. (L.S.)