An Improved Manufacture of Enamelled Cloisonne.
Year: 1898

page_text: COMPLETE SPECIFICATION.
An Improved Manufacture of Enamelled Cloisonne.
I, THEOPHIL PFISTER, of 5, 6 and 7, Lensden Place, Golden Lane, in the
County of London, Manufacturer, 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 enamelled cloisonné, and the chief feature of my said
invention is an improved method of forming the cells between the contours or
divisions of the cloisonné to receive the enamel filling.
According to my invention I take a transparent oi opaque foundation plate
upon which the work 18 to be formed as described in the Specification of my prior
Patent No. 17140 AD) 1898. If the plate is transparent I lay it over the draw-
ing of the design which is to be copied, but if it is opaque I lay the drawing on
the plate and glue it thereto. The drawing may be on paper or other suitable
material. I next form the outlines or contours of the cloisonné by means of
wire strips or other divisions fastened on the foundation plate by a suitable
adhesive material that will dissolve in water, or I use a stamped or moulded
frame for the purpose, and after the adhesive material has set, I apply a layer of
ground glass or particles of glass on the like upon the plate in the interstices
between the wire strips. The thickness of the layer 18 arranged in accordance
with the depth it 18 desired the cells shall have, but it is never so gicat as to cover
the contour strips, on the contrary the latter always project a suitable distance
above the layer of ground glass or particles. I then apply over the work a
backing of fire clay mixed with water to bung it to a suitable pliable consistency,
and allow the whole to stand until the clay is set, whereupon the contour strips
will be found embedded in the clay. The work is next placed in a water bath to
free the contour stups from the foundation plate which is removed, and with it
the superfluous ground glass or glass particles which fall away leaving the strips
embedded in the clay and a number of depressions or cells in the places previously
occupied by the ground glass or glass particles
The contour strips are now, according to one method, painted with enamel
paint, and the cells are then filled with particles of glass of the proper colours
in accordance with the requirements of the design. The work is then placed in
a kiln or in an oven and a flame is caused to play upon its surface to melt the
glass particles which should be very soft so that a high temperature is not required
to fuse them Glass containing a high proportion of lead is very suitable for this
purpose I then place the work in an annealing oven and if necessary fire polish
the surface.
In some instances I do not enamel the contour stripe, and in such instances I
subject the surface of the work to a grinding and polishing operation by hand
or power, after it leaves the annealing oven, in order to restore the brightness
of the said strips I may then gild or bronze the strips in a suitable gilding or
bronzing vat or otherwise coat the surface thereof to protect the same and to im-
prove the appearance of the work. I find it is preferable to gild or bronze the
contour strips after the work has been polished

page_text: In lieu of metal contour strips I sometimes employ strips made of threaded
beads as described in the Specification of my prior Patent No. 17141 A D 1898.
In some instances I attach a metal plate to the clay backing of the cloisonné.
My improved method of forming enamelled cloisonné is very advantageous
inasmuch as the cells can be filled in by inexperienced persons, and highly
artistic effects produced in a cheap and mechanical manner
It is obvious of course that the foundation plate may be flat or curved as may
be desired.
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 18.
1 In the manufacture of cloisonné work, the method, substantially as herein
described, of forming the cells to recoive the enamel filling.
2 In a process of manufacturing enamelled cloisonné, the following series of
steps, viz, securing the coutour strips to a foundation plate, applying a layer
of ground glass on the like in the spaces between the strips, and then a backing
of clay, subsequently removing the foundation plate and the superfluous ground
glass or particles, and filling the cells thus formed with soft glass and fusing
the same, substantially as described
3 in the process claimed in the preceding claiming clause, either protecting
the contour stips by enamel paint before fusing the enamel filling, or subse-
quently grinding and polishing the strips and then coating the same, substantially
as described
4. Enamel cloisonné work produced by any of the methods herein described.
September
GEORGE HARRISON,
35, Therapia Road, Honor Oak, London,
Agent for the Applicant.