Improvements in the Manufacture of Coloured Relief Impressions on Sheet Metal.
Year: 1886

page_text: Improvements in the Manufacture of Coloured Relief
Impressions on Sheet Metal. :
We, FRIEDMANN PRIESTER Manufacturer and OTTO WEIDEMANN Manager both
of 5 Luckauer Strasse Berlin do hereby declare the nature of this invention to
be as follows:-
In the manufacture of coloured relief impressions on sheet metal the defect is
met with, that in the stamping the layers of color easily spring off, the metal being
thus laid bare especially when the relief surfaces have strong or sudden transitions
and sharp corners. This evil cannot be avoided even when the color layers are
made of elastic bodies, for even in such cases a chemical combination will take
place between the metallic oxide contained in the color and the sheet metal or brass
itself so that a layer of oxide.although ever so thin will form there, which renders
the elasticity of the color layer illusory and moreover produces an alteration in the
color of the color layer, so that for instance zinc white painted on brass assumes a
greenish shade.
In order to avoid these defects and according to our invention we put between
the sheet metal and the color layers a skin like and as, thin as possible elastic and
indifferent insulating layer which forms connection between the sheet metal and
the color layer and prevents the constituent parts of the color layers from coming
in contact with the metal, while on the other hand securing such an elastic con-
nection between metal and color that the color layers do not spring off even with
sudden transitions and pressing.
This insulating layer consists of a thin fluid mixture clear as water and
With this mixture we give the clean surface of the sheet a very thin coating, and
after it is dry the layers of. color are put on while applying an elastic grounding
layer composed about as follows:—
With 200 parts by weight of lead white ground up in double varnish and
100 parts of zinc white we mix 10 parts of Venetian turpentine, 15 of india
Price 71.

page_text: rubber and 10 of elemi rosin, both dissolved in benzine, 30 of benzine, 85 of
turpentine, 5 of virgin wax dissolved in varnish and turpentine and 10 oxide of
manganese.
For better articles we put on this grounding layer a second grounding composed
as follows:-With 400 parts by weight of zinc white ground up with double varnish
we mix six parts by weight of india rubber dissolved in benzine, 5 of Venetian
turpentine, 50 siccative powder ground up in varnish, 30 of virgin wax dissolved
in turpentine, 10 of poppy oil, and benzine and turpentine as required.
If the body or ground of the sheet to be colored is not desired to be white but
colored we may mix the desired color in with the zinc white and lead white as
required and thus produce the desired shade. The pattern is then put on or
printed on the ground layers and the aforesaid ground layers admit of printing
a great number of different colors upon each other similar to the production of
chromo prints on paper as the ground layers have the faculty of so sucking up thẹ
colors, that the colors, printed one upon the other, stick.
Sheets of metal thus treated may be stamped in relief without that the color
layers spring off or alter in any way which is owing mainly to the insulating layer
and the elastic grounding layer.
1
1000

page_text: Improvements in the Manufacture of Coloured Relief
Impressions on Sheet Metal.
We FRIEDMANN PRIESTER, Manufacturer, and OTTO WEIDEMANN, Manager, both
of 5 Luchauer Strasse, Berlin 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:—
In the manufacture of coloured relief impressions on sheet metal the defect is
met with that in the stamping the layers of colour easily spring off, the inetal
being thus laid bare especially when the relief surfaces have strong or sudden
transitions and sharp corners or edges. This evil cannot be avoided even when
the colour layers are made of elastic bodies, for even in such cases a chemical
combination will take place between the metallic oxide contained in the colour and
the sheet metal or brass itself so that a layer of oxide although ever so thin will
form there, which renders the elasticity of the colour layer illusory and moreover
produces an alteration in the colour of the colour layer, so that, for instance, zinc
white painted on brass assumes a greenish shade.
In order to avoid these defects and according to our invention we put between
the sheet metal and the colour layers a skin like, and as thin as possible, elastic
and indifferent insulating layer which forms connection between the sheet metal
and the colour layer and prevents the constituent parts of the colour layers from
coming in contact with the metal, while on the other hand securing such an elastic
connection between metal and colour that the colour layers do not spring off even
with sudden transitions and pressing.
This insulating layer consists of a thin fluid mixture clear as water and
consisting of about

page_text: If the body or ground of the sheet to be coloured is not desired to be white but
coloured we may mix the desired colour in with the zinc white and white lead as
required and thus produce the desired shade. The pattern is then put on or
printed on the ground layers and the aforesaid ground layers admit of printing
a great number of different colours upon each other similar to the production of
chromo prints on paper as the ground layers have the faculty of so sucking up the
colours, that the colours printed one upon the other stick.
Sheets of metal thus treated may be stamped in relief without that the colour
layers spring off or alter in any way which is owing mainly to the insulating layer
and the elastic grounding layer.
Having now particularly described and ascertained the nature of our said
invention and in what manner the same is to be performed we declare that what
we claim is
1. In the production of coloured relief impressions on sheet metal the application
of an elastic and indifferent insulating layer between the surface of the metal and
the elastic ground layer, such insulating layer consisting of a thin fluid mixture of
turpentine, benzine, copal lac and India rubber dissolved in benzine substantially
in the proportions described.
2. In the production of coloured relief impressions on sheet metal the application
of elastic ground layers which form connection with the layers of colour printed
thereon and consist of white lead or zinc white in combination with turpentino
and India rubber dissolved in benzine substantially as described.
3. In the production of coloured relief impressions on sheet metal the application
of an insulating layer and then one or more grounding layers preparatory to the
application of the colour pattern all substantially as described.
Dated this 29th day of September 1886.
FRIEDMANN PRIESTER.
OTTO WEIDEMANN.
By Jensen & Son,
Patent Agents,
77, Chancery Lane, London, W.C.