Improvements in the Process of Cementing Asbestos.
Year: 1888

page_text: Date of Application, 23rd Oct., 1888
Complete Specification Left, 23rd July, 1889-Accepted, 24th Aug., 1889
PROVISIONAL SPECIFICATION.
Improvements in the Process of Cementing Asbestos.
We JOHN DEWRANCE of 158 Great Dover Street; Lambeth, in the County of
Surrey, Engineer, and BONNEVAL EDWARD CHURCH of 27 Warner Street Now
Kent Road, S.E. Foreman in the employ of Dewrance & Co. do hereby declare the
nature of this invention to be as follows:-
i
Asbestos cemented with india rubber has been used for various purposes and is
made as follows:-
India rubber is dissolved in naphtha or some other suitable solvent & the solution
is mixed with asbestos & sulphur, the solvent is evaporated after the material has
been moulded rolled or pressed into the form required & then vulcanized. To make
the solution mix thoroughly with the asbestos, especially Canadian asbestos, the
solution has to be very thin & the waste of solvent is considerable and forms a large
part of the cost of the material produced.
Our invention consists in mixing India Rubber solution with water, by preference
we shake up or beat up the solution with warm distilled water, so that the solution
is thoroughly impregnated with the water, or in other words, is destended by the
presence of globules of water throughout the solution & in this condition a solution
containing only just enough naphtha to thoroughly dissolve the rubber, can be readily,
mixed with even the most fluffy Canadian asbestos either wet or dry so that a very
large proportion of the solvent hitherto necessary is saved, sulphur or other vulcanizing
material may be mixed in.
After the mixing is completed some of the water can be squeezed out & the
remainder is evaporated after the material is moulded, rolled or pressed into the
form required, or the fibres, may be separated dried and then caulked into the grooves
of cocks in the manner described in a patent granted to one of us, No. 4282 of 1883.
The material may be vulcanized by any of the known vulcanizing processes.
Noted thin ɔɔ… bv of Ontahan 1900
"
COMPLETE SPECIFICATION.
Improvements in the Process of Cementing Asbestos.
We JOHN DEWRANCE of 158 Great Dover Street, Lambeth, in the County of
Surrey, Engineer, and BONNEVAL EDWARD CHURCH of 27 Warner Street New Kent
Road, S.E. Foreman in the employ of Dewrance & Co., 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:-
Asbestos cemented with India-Rubber has been used for various purposes and
has hitherto been prepared as follows:-
India-Rubber dissolved in naptha or some other suitable solvent has been mixed
with Asbestos and Sulphur, the solvent evaporated and the material moulded into the
form required and vulcanized. In this process in order to make the solution mix
thoroughly with the Asbestos, especially Canadian Asbestos the solution has to be
very thin and the waste of solvent is considerable and forms a large part of the cost
of the material produced.
Our invention is in mixing with water India Rubber solution with which the
Asbestos is to be cemented.
By preference we shake up or beat up the India Rubber solution with warm
distilled water so that the solution is thoroughly impregnated with the water. The

page_text: solution in this condition is then thoroughly mixed with the Ashestos by shaking up
kneading, rolling, or pounding them together or by any convenient means, and it is
found that an India Rubber solution impregnated with water as above and containing
only just enough naptha or other solvent to thoroughly dissolve the rubber can he
readily mixed with even the most fluffy Canadian Asbestos either wet or dry. We
have found in practice that instead of shaking or beating up the India Rubber
solution with water before mixing it with the Asbestos, we may soak the asbestos
itself with water and then place it when so soaked in the India-Rubber solution, and
mix the materials together as above described. Sulphur, plumbago, litharge, or
other material may be mixed in during the operation of mixing the Asbestos and
Rubber solution or afterwards.
After the mixing of the Asbestos and the above mentioned impregnated India-
Rubber solution is completed some of the water can be squeezed out and the remaining
water and the solvent are evaporated.
The material may be moulded rolled or pressed into the form required or the fibres
may be separated and caulked into the grooves of cocks in the manner described in
a Patent granted to one of us No. 4282 of 1883.
The material may be vulcanized by any of the known vulcanizing processes.
By our invention the use of a large proportion of India Rubber solvent is dispensed
with at the same time the mass is more evenly and uniformily mixed and can be
moulded with greater ease.
Having now particularly described and ascertained the nature of our inven-
tion and in what manner the same is to be performed, we declare that what we
claim is :-
The improved process of mixing an India Rubber solution with Asbestos by the
use of water substantially as hereinbefore described.
Dated this 93rd day of July 1889
JOHN DEWRANCE.
BONNEVAL E. CHURCH.