Improved Plates for Printing, and the Process of Manufacturing the same.
Year: 1896

page_text: Improved Plates for Printing, and the Process of Manufacturing
the same.
I, ANTOINE CASANOVA, Engineer, of 95 Boulevard Beaumarchais, Paris in the
Republic of France, do hereby declare the nature of this invention to be as
follows:-
Independently of the stone, called "Lithographic stone," lithographers use
Inetallic plates, such as zinc plates, called zincographic plates, which are simply
grained, without any other preparation, and also other plates of the similarly grained
zine, which have been subinitted to a preparation consisting in covering the plates
with a special solution by coating them with a liquid which being afterwards dried,
is thus transformed into a solid.adhesive coating of the same composition as the
above mentioned solution.
Practically, neither the one nor the other of these two plates euables the
lithographer to obtain, with the necessary degree of perfection, certain results which
hitherto have only been obtained by the exclusive use of lithographic stones.
The new plates which form the object of the present application for a patent, on
the contrary, can be used and compete successfully with the lithographic stones, in
all instances where the use of the latter has been hitherto required, and, therefore;
the plates may be substituted for stones.
The plates are made of zincographic plates either grained, or not, covered by
electrolytic means with an adhesive metallic coating, the deposit of which on the
zine is obtained by electrolysis in an alkaline (ammoniacal) bath of sulphate or
nickel, and not by electrolysis in an acid bath such as it is used for the nickelisation
of zinc or of other metals.
By this process in an alkaline bath I obtain plates which can be used for printing,
whilst the plates obtained in an acid bath could not be used for that purpose.
It is this characteristic difference existing between the two baths which constitutes
the novelty of the process by means of which the plates in question are obtained.

page_text: As an instance: The composition of the baths to be used may vary in the following
proportion:
Sulphate of nickel (ammoniacal sulphate preferable)
Liquid ammonia
Water
To which can be added sea water salt
- 8 to 12 parts
4 to 10 parts
100 parts
5 to 10 parts.
On their coming out of the bath the plates are simply carefully rinsed, and then
dried. In that state they are ready to receive the drawings, printings, copies etc. in
black or in colours, which are effected by the usual processes, exactly as when using
lithographic stones.
The plates, in the same manner as stones, afford the possibility of effacing, partly
or totally, the said drawings, printings copies, etc., and also of correcting, modifying
or entirely executing them again.
The durability of the drawings, printings, copies on these plates, is indefinite, the
surfaces on which they are formed being unalterable.
In operating in the same manner as for zinc plates, plates of other metals, such for
instance as copper, brass, iron etc. can be coated with the same metallic coating as
the zinc plates.
Dated this 19th day of November 1896.
BOULT & WADE.
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improved Plates for Printing, and the Process of Manufacturing
the same.
I, ANTOINE CASANOVA, Engineer, of 95 Boulevard Beaumarchais, Paris in 'the
Republic of France, 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 :-
Independently of the stone, called "Lithographic stone," lithographers use
metallic plates, such as zinc plates, called sincographic plates, which are simply
grained, without any other preparation, and also other plates of the similarly grained
zinc, which have been submitted to a preparation consisting in covering the plates
with a special solution by coating them with a liquid which being afterwards dried,
is thus transformed into a solid adhesive coating of the same cottposition as 'the
above mentioned solution.
Practically, neither the one nor the other of these two plates enables the
lithographer to obtain, with the necessary degree of perfection, certain results which
hitherto have only been obtained by the exclusive use of lithographic stones.
The new plates which form the object of the present application for a patent, bn
the contrary, can be used and compete successfully with lithographic stones, in all
instances where the use of the latter has been hitherto required, and, therefore, the
plates may be substituted for stones.
The plates are made of zincographic plates either grained or not, covered by
electrolytic means with an adhesive metallic coating, the deposit bf which on 'the
zinc is obtained by electrolysis in an alkaline (ammoniacal) bath of stilplate'df nickel,
and not by electrolysis in an acid bath such as it is used for the nickelisation of zinc
or of other metals.

page_text: By this process in an alkaline bath I obtain plates which can be used for printing,
whilst the plates obtained in an acil bath coull not be used for that purpose.
It is this characteristic difference existing between the two baths which constitutes
the novelty of the process by means of which the plates in question are
obtained.
As an instance: The composition of the baths to be used may vary in the following
the novelty of the process by means of which the plates in question are
obtained.
As an instance: The composition of the baths to be used may vary in the following
proportion:
Sulphate of nickel (ammoniacal sulphate preferable)
Liquid aminonia
Water
To which can be added sea-water salt-
-
- 8 to 12 parts
-
4 to 10 parts
100 parts
5 to 10 parts.
On their coming out of the bath the plates are simply carefully rinsed, and then
dried. In that state they are ready to receive the drawings, printings, copies etc., in
black or in colours, which are effected by the usual processes, exactly as when using
lithographic stones.
The plates, in the same manner as stones, afford the possibility of effacing, partly
or totally, the said drawings, printings, copies etc., and also of correcting, modifying
or entirely executing them again.
The durability of the drawings, printings, copies on these plates, is indefinite,
the surfaces on which they are formed' being unalterable.
In operating in the same manner as for zinc plates, plates of other metals, such for
instance as copper, brass, iron etc. can be coated with the same metallic coating as
the zinc plates.
Having now particularly described and ascertained the nature of my said
invention and in what manner the same is to be performed, I declare that what I
claim is :-
1. Metallic printing plates provided with a metallic coating, substantially as
described.
2. In the production of printing plates the use of an alkaline bath, such as
described, for producing a metallic deposit upon the plates by electrolysis substantially
as described.
BOULT & WADE,
Agents for the Applicant.