Improvements in the Manufacture of Lithographic Plates.
Year: 1891

page_text: Date of Application, 29th July, 1891
Complete Specification Left, 11th Feb., 1892-Accepted, 12th Mar., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Lithographic Plates.
I, JULIUS WEZEL, of the firm of Wezel and Naumann, Manufacturers, of
Reudnitz-Leipzig, in the Kingdom of Saxony, do hereby declare the nature of
this invention to be as follows:-
This invention relates to a method or manufacture by means of which metal
plates may be provided with a surface layer of material adapted for receiving and
printing impressions in a similar manner to lithographic stone. The object of the
invention is to so improve the method that the resulting surface shall be freed from
the tendency after a short time of use of taking up colour or ink on parts not
covered with any drawing and transferring such colour or ink to the paper
impressed.
The chalky material dissolved as before described in the Specification of Letters
Patent No. 3305 of 1885 in place of being mixed with resin or soft soap is mixed
with aluminium-palmitate and a small quantity of asphalt previously dissolved
together in oil of camphor. Any free acid which may remain in this mixture is
then neutralized with potash and pressed or filtered. The solid residue is then
distributed in a weak solution of soda and blown onto the heated metal plate
by injectors or other convenient apparatus as described in the Specification
aforesaid.
Dated this 29th day of July 1891.
HERBERT & Co.,
Agents for the Applicant.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of Lithographic Plates.
I, JULIUS WEZEL, of the firm of Wezel and Naumann, Manufacturers, of
Reudnitz-Leipzig, 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 a method or manufacture by means of which metal
plates may be provided with a surface layer of material adapted for receiving and
printing impressions in a similar manner to lithographic stone. The object of the
invention is to so improve the method that the resulting surface shall be freed
from the tendency after a short time of use of taking up colour or ink on parts
not covered with any drawing and transferring such colour or ink to the paper
impressed.
The chalky material dissolved as before described in the Specification of Letters
Patent No. 3305 of 1885 in place of being mixed with resin or soft soap is mixed
with aluminium-palmitate and a small quantity of asphalt previously dissolved
together in oil of camphor. Any free acid which may remain in this mixture is
then neutralized with soda or potash and pressed or filtered. The solid residue is
then distributed in a weak solution of soda and blown onto the heated metal plate
by injectors or other convenient apparatus as described in the Specification
aforesaid.

page_text: Chalk
Aluminium-palmitate
Oil of camphor
Asphalt
To neutralize the above, ½ per cent. of the alkali.
12-0
1-2
9.0
0.1
I lay no claim to the use of chalk or of asphalt nor to the method of applying
the aforesaid ingredients but,
Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I 1
claim is :-
In the manufacture of lithographic plates or surfaces the combination or mixture
of chalk and asphalt with aluminium-palmitate, and oil of camphor for the purpose
set forth.
HERBERT & Co.,
18, Buckingham Street, Strand, London, W.C., Agents for the Applicant.