A Moistening Material for Lithographic Stones or Metal Plates, and a Process for Preparing it.
Year: 1898

page_text: Date of Application, 18th Mar., 1898
Complete Sonnifination left 2nd Dec. 1898- Accepted. 28th Jan., 1899
Date of Application, 18th Mar., 1898
Complete Specification Loft 2nd Dec. 1898-Accepted, 28th Jan., 199
PROVISIONAL SPECIFICATIVA.
A Moistening Material for Lithographic Stones or Metal Plates, and a
Process for Preparing it.
We, FRIEDRICH HEY, of V Hundsthurmerstrasse 46, Merchant, GEORG JACOB
ROEDER, of XVIII Schoppenhauerstrasse 32, Merchant, and JOHANN ADELSBERGER,
of XIV Goldschlaggasse 88, Lithographer, all of Vienna, Austria, do hereby
declare the nature of this invention to be as follows:-
It is well known that in the process of chemical printing it has been necessary,
heretofore, to wipe and moisten the lithographic stone or metal plate (zinc and
aluminium plates) after each impression.
According to our invention this necessity is avoided by the use of a protective
moistening material a small quantity of which is spread over the printing plate
in a thin layer by means of the colour roller when the plate is being coloured;
in this way the surface of the plate is kept so moist that the laying on of the
colour after each impression is as exact as when wiping with water is adopted,
and the colour adheres only to the parts where it is required, being repelled with
certainty by the etched parts.
The chief constituent of our new moistening material is glycerine the effect
of which is indeed known; but it is impracticable to use glycerine alone or to
mix it with the printing colour because it does not let the colour pass through it
and when mixed with the colour the latter acquires the property of not losing
moisture so that the print does not dry for a long time. The impression is in
this case weak (not full) and the colour is liable to smear.
It is therefore necessary to prevent, if not entirely, as far as possible, the inter-
mixture of the glycerine with the colour and by our invention we add tartaric acid
and sodium chloride (common salt) to the glycerine, an addition which prevents
on the one hand, the intermixture of the glycerine with the colour and on the
other hand the smearing of the latter.
By adding alcohol the moistening material is at the same time isolated from
the layer of colour.
In order to render the moistening material more easily worked and to make it
adhere better to the roller a little drying oil (linseed oil) may be added to it.
It must here be remarked that when such a moistening material is used care
must be taken not to put too much of it on the roller.
Without confining ourselves to the exact proportions we will give a recipe for
the preparation of the material.
About 50 parts by weight of glycerine of 30 per cent. strength are placed in
a large vessel. About 2 parts by weight of finely powdered tartaric acid and
about 2 parts by weight of sodium chloride are separately dissolved each in
about 18 parts by weight of distilled water.
These two solutions are mixed with about 8 parts by weight of alcohol (9° per
cent. strength) and if necessary with 4 parts by weight of linseed cil; the mixture
is boiled and, while boiling, poured into a fine sieve, best a linen sieve, held over

page_text: the glycerine vessel; this sieve retains from 2 to 3 parts of the linseed oil, whereby
the meshes are partially stopped up. The portion of the oil which runs through
is a sufficient addition to the moistening material.
After the strained mixture has become clear it is ready for use; it suffices to
place a few drops on the colour roller (either directly or by means of a feeding
roller) and to spread them by rolling.
For the tartaric acid and common salt can be substituted phosphoric acid or
nitric acid in a corresponding degree of dilution, but in a large number of cases
this would lead to the attack of the printing plate.
Dated this 18th day of March 1898.
ABEL & IMRAY,
Agents for the Applicants.
A Moistening Material for Lithographic Stones or Metal Plates, and a
Process for Preparing it.
We, FRIEDRICH HEY, of V Hundsthurmerstrasse 46, Merchant, GEORG JACOB
ROEDER, of XVIII Schoppenhauerstrasse 32, Merchant, and JOHANN ADELSBERGER,
of XIV Goldschlaggasse 88, Lithographer, all of Vienna, Austria, do hereby
declare the nature of this invention and in what manner the same is to be per-
formed, to be particularly described and ascertained in and by the following
statement:-
:-
It is well known that in the process of chemical printing it has been necessary,
heretofore, to wipe and moisten the lithographic stone or metal plate (zinc and
aluminium plates) after each impression.
According to our invention this necessity is avoided by the use of a protective
moistening material a small quantity of which is spread over the printing plate
in a thin layer by means of the colour roller when the plate is being coloured;
in this way the surface of the plate is kept so moist that the laying on of the
colour after each impression is as exact as when wiping with water is adopted,
and the colour adheres only to the parts where it is required, being repelled with
certainty by the etched parts.
The chief constituent of our new moistening material is glycerine the effect
of which is indeed known; but it is impracticable to use glycerine alone or to
mix it with the printing colour because it does not let the colour pass through it
and when mixed with the colour the latter acquires the property of not losing
moisture so that the print does not dry for a long time. The impression is in
this case weak (not full) and the colour is liable to smear.
It is therefore necessary to prevent, if not entirely, as far as possible, the inter-
mixture of the glycerine with the colour and by our invention we add tartaric acid
and sodium chloride (common salt) to the glycerine, an addition which prevents
on the one hand, the intermixture of the glycerine with the colour and on the
other hand the smearing of the latter.
By adding alcohol the moistening material is at the same time isolated from
the layer of colour.
In order to render the moistening material more easily worked and to make it
adhere better to the roller a little drying oil (linseed oil) may be added to it.
It must here be remarked that when such a moistening material is used care
must be taken not to put too much of it on the roller.
Without confining ourselves to the exact proportions we will give a recipe for
the preparation of the material.

page_text: About 50 parts by weight of glycerine of 30 per cent. strength are placed in
a large vessel. About 2 parts by weight of finely powdered tartaric acid and
about 2 parts by weight of sodium chloride are separately dissolved each in
about 18 parts by weight of distilled water.
These two solutions are mixed with about 8 parts by weight of alcohol (90 per
cent. strength) and if necessary with 4 parts by weight of linseed oil; the mixture
is boiled and, while boiling, poured into a fine sieve, best a linen sieve, held over
the glycerine vessel; this sieve retains from 2 to 3 parts of the linseed oil, whereby
the meshes are partially stopped up. The portion of the oil which runs through
is a sufficient addition to the moistening material.
After the strained mixture has become clear it is ready for use; it suffices to
place a few drops on the colour roller (either directly or by means of a feeding
roller) and to spread them by rolling.
For the tartaric acid and common salt can be substituted phosphorie acid or
nitric acid in a corresponding degree of dilution, but in a large number of cases
this would lead to the attack of the printing plate.
Having now particularly described and ascertained the nature of this
invention and in what manner the same is to be performed, we declare that what
we claim is:-
1. A moistening material for lithographic stones or metal plates consisting of
glycerine mixed with tartaric acid, common salt, alcohol, water and if necessary,
a drying oil such as linseed oil.
2. A process for preparing a moistening material such as is referred to in
Claim 1, consisting in mixing solutions of tartaric acid and common salt with
alcohol and linseed oil, boiling the mixture and pouring it, while it is boiling,
into the glycerine through a metal or a linen sieve so that the meshes of the sieve
are stopped up and the larger part of the oil retained, substantially as described.
Dated this 2nd day of December 1898.
ABEL & IMRAY,
Agents for the Applicants.