Improvements in the Manufacture of Perforated Metal Sheets for Sieves, Screens, and the like.
Year: 1891

page_text: Date of Application, 16th Mar., 1891
Complete Specification Left, 14th Dec., 1891-Accepted, 13th Feb., 1892
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of Perforated Metal Sheets for
Sieves, Screens, and the like.
1, KARL KLIC, of Accrington, in the County of Lancaster, Painter, do hereby
declare the nature of this invention to be as follows:-
-
The object of my invention is the deposition of metal upon surfaces portions of
which are so prepared as to resist such deposition in order that articles suitable for
the purposes of sieves, screens and the like woven or perforated metallic articles
may be produced.
In carrying out this invention I take for example a roller flat or other surface
suitable for use as a cathode and, where necessary, coat the same with a covering
of suitable resistant material so thin that whilst it allows the process of deposition
to proceed it yet prevents the deposited metal from coming into actual contact
with or adhering to the cathode.
I thereafter apply to the roller or flat or other surface so prepared with partial
resist, where necessary, an absolute resist, which absolute resist made to adhere
to such portions of the surface, as are intended in the finished article to represent
the apertures or open spaces of woven or perforated materials, and by this means
am enabled to produce in a more economical and satisfactory manner, the articles
above mentioned and others of a like description ordinarily produced by weaving
or perforation.
Lith day of March 1901
H. B. BARLOW,
Agent for Applicant.
COMPLETE SPECIFICATION. .
Improvements in the Manufacture of Perforated Metal Sheets for
Sieves, Screens, and the like.
KARL KLIC of Accrington in the County of Lancaster Painter do hereby
declare the nature of my said 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 my invention is to effect the manufacture or production of sieves
screens and the like by the deposition of metal upon portions of surfaces having
other portions thereof so prepared as to resist such deposition in order to produce
articles such as sieves screens and the like which are usually made of woven or
perforated metal.
In carrying out this invention I take for example a roller or a flat or other
surface suitable for use as a cathode, and where necessary coat the same with a
covering of suitable resistant material so thin that, whilst it allows the process of
deposition to proceed, it prevents deposited metal from coming into actual contact
with, or adhering to, the cathode.
I thereafter apply to the surface so prepared with partial "resist" where
necessary an absolute "resist" which absolute "resist is made to adhere to the
portions of the surface that in the finished article are intended to represent the
apertures or open spaces. By this means I produce in a manner more economical
and satisfactory than hitherto sieves, or screens, or other articles of a like description,
ordinarily produced by weaving, interlacing, or perforating,
A suitable material for the aforesaid partial resist is a weak solution of wax, or

page_text: like substance, in a volatile solvent, which solution apply uniformly over the
surface, or cover the surface with a thin deposit of silver, or other suitable
metal, which may for greater safety be also painted over with the solution of wax
in a volatile solvent. The absolute "resist "is then laid on the surface, but it is
immaterial, or only a matter of convenience whether the absolute "resist" is put
on first, and the partial "resist" afterwards, or rice versa.
In case the perforated metallic articles to be prepared have the perforations
in small and often repeated figures, or designs, such as sieves for instance, the
surface upon which deposition is to be made may be embossed (especially if
it be a roller of copper, brass, or other suitable metal) with a mill, on which these
figures or designs are in relief, or in intaglio. The application of the absolute
"resist
can then be easily performed by covering with it the whole surface, and
subsequently removing it from the projecting parts, if the metal is to be deposited
on these or by covering only the projecting parts with the absolute "resist" by
means of a roller, or other convenient means, and leaving the deeper parts free to
be covered by the partial resist, if the metal is to be deposited in the lower parts
of the surface.
The absolute resist can however be applied to the surface by picoting (stippling
or marking with small dots) stencilling, painting transferring or other suitable
means.
The surface thus prepared is placed in the electro-depositing vat as cathode and
kept there, under the electric current until the deposited copper, or other metal, is
of sufficient thickness, when it is taken out, cleaned and the deposited metal
removed.
7"
I can make sieves, or other perforated metallic articles according to my invention,
using as patterns sieves or articles of woven wire, or perforated, or interlaced,
material, either by taking an impression of such sieve, or article, in a suitable
substance, making the surface conductive, and applying absolute "resist to those
parts which are to appear as perforations in the finished article, and a partial
"resist" to those parts upon which the metal is to be deposited, and placing the
impression thus prepared as cathode in a depositing vat until the deposited metal
is sufficiently thick, when the latter is removed, washed and finished in any desired
way. Or I may secure the wire woven sieve, or other article used as a pattern,
with a resin, varnish, cement, or other suitable material, upon a support, capable of
resisting the liquor of the depositing vat, for instance a metallic roller, or other
surface, or some woven material, or paper, well prepared with a resisting varnish,
so that the wires of the sieve are in relief. After the surface is made conductive,
the whole is placed in the depositing vat as cathode until the metallic deposit
sufficiently thick. The latter is removed from the sieve, or other pattern, and its
support, its surface is prepared with partial resist" and absolute "resist" in the
manner hereinbefore described, and it is used as matrix for electrolytically
depositing metal upon it; I obtain thus a sheet of metal with perforations corre-
sponding to the woven wire sieve or other article, used as a pattern.
The precise method of carrying out my invention may be varied according to
convenience, and to the nature of the article to be made. I have described and
illustrated the best means with which I am acquainted but I do not limit the
application of my invention to these precise means described, as it will be evident
that they may be varied without departing from the nature of my invention.
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
claim is :-
1. The improvements in the manufacture of perforated metal sheets for sieves,
screens, and other perforated articles, by electrical deposition upon surfaces having
those portions on which the metal is to be deposited composed of, or covered by, a
substance which will not prevent the electro-deposition but will allow of the
subsequent removal of the deposited metal, and with the portions which correspond

page_text: to perforations in the finished articles covered with, or composed of, a material
resisting electro deposition substantially as herein before explained.
2. As new articles of manufacture, products such as are produced as hereinbefore
described and claimed.
Dated this with dow of December 1901
J. H. JOHNSON & Co.,
Agents.