Improvements in Insulating Electrical Conductors.
Year: 1899

page_text: PROVISIONAL SPECIFICATION.
Improvements in Insulating Electrical Conductors.
I, WALTER WILLIAM COLLEY, of 147, Great Saffron Hill, London, E.C., Manu-
facturer of Coil Papers, do hereby declare the nature of this invention.
to 'be as follows:-
This invention relates to treating paper fibre or the like by unreeling same from
a roll or long length and passing it through a bath of solution composed of
creosote or naphthaline, resin, oil of turpentine, and glycerine, all of which are
treated in the following manner, to form one composition, for the purpose of
preparing rolls of paper, fibre or the like, for insulating electrical conductors. I
first take the oil of turpentine and treat it with sulphuric acid until the acid is
entirely absorbed by the turpentine; this treatment will take several days after
which the turpentine is tested with sensitive paper to see if the acid is entirely
absorbed and quite spent. I next treat the creosote or naphthaline with caustic
soda by heating same in a pan by steam, to this I add ordinary resin, when the
resin is dissolved the treated turpentine is added and the whole allowed to cook
When cool the
by the steam until same is ready to receive the glycerine.
solution is in a liquid state and ready to apply to the paper or material.
Where the paper or fibre is only required for insulating conductors that convey
only a moderate current of electricity I may only use a portion of the combination
and dispense with the glycerine and turpentine or glycerine and creosote or naph-
thaline, but when the large quantity of current is required to be used I prefer to
use the whole combination.
In place of treating the turpentine with sulphuric acid I could use it with
the combination untreated but I prefer to use it as described above.
A
1000

page_text: 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 improvements in the manner of treating paper fibre
and the like to enable such paper fibre or other material to be used as an
insulating covering for electrical conductors.
I preferably employ a specially prepared compound to soak the paper or other
material in, but in some cases I may only employ some of the ingredients
mentioned in the special compounds.
I first prepare the special compound in the following manner.
To 5 gallons of turpentine I add one gill of commercial sulphuric acid and
allow the two to stand in a vessel for 24 hours more or less, when the acid
becomes spent, and the turpentine is changed from a white spirit into a deep
coloured oily substance, which contains nothing that is injurious to the fibre of
the material to be used, as hereinafter described, that is to say all the injurious
properties are deposited at the bottom of the vessel. When the treated spirit is
drawn off care must be taken that only the clean spirit is taken from the vessel
for if any of the deposit is allowed to get mixed with the spirit the fibre or
material will in course of time perish and so become useless. To obviate this
difficulty I test the clear spirit with blue sensitive paper when the presence of
acid will cause the paper to turn to a deep brown, but, where there is no acid
.the paper retains its normal colour.
I next treat creosote or naphthaline with an alkali preferably caustic soda by
heating same in a copper or vessel preferably by steam.
The proportions that I find work well are as follows (but I may vary the pro-
portion according to the fibre or material required to be treated).
I take 50lbs. of creosote or naphthaline to 1 gallon of caustic soda or its equi-
valent when these are mixed I add 100lbs. of resin, this compound is gently
heated until the whole is dissolved, the prepared turpentine is now added, about 1
gallon to the above quantity. The above is allowed to cook that is to say, to
gently simmer until the whole of the parts are mixed together to form one body,
when all the good qualities of the compound combine the useless residue being
drawn off in the usual way, after the compound has been allowed to cool.
I next gently heat the compound and add glycerine in about the following
proportions. To 150lbs. of the compound I add the same weight of glycerine,
when this compound is ready for use. I then pass the fibre or material through
same allowing sufficient time for the material to be in the bath to absorb the
compound after which when dry the material is ready for use for covering the
wire.
Having now described the nature of my invention and in what manner the same
is to be performed I declare that what I claim is:-
1. In insulating electrical conductors, treating paper or other suitable material
with a compound composed of resin and glycerine and then insulating electrical
conductors with such prepared material.
2. In insulating electrical conductors, treating paper or other suitable material
with a compound composed of resin creosote or naphthaline then insulating
electrical conductors with such prepared material.
3. In insulating electrical conductors, treating paper or other suitable material
with a compound composed of resin creosote or naphthaline and glycerine and
then insulating the conductors with such prepared material.
4. In insulating electrical conductors, treating paper other suitable material
with a compound composed of resin, turpentine and glycerine and the insulating
electrical conductors.
5. In a compound for treating paper or other suitable material to render the
same suitable for insulating purposes, the employment of glycerine.
G. In insulating electrical conductors, treating paper or suitable material with

page_text: a compound composed of any one of the ingredients before mentioned-other than
glycerine, and insulating electrical conductors with such prepared material.
7. In insulating electrical conductors the special compound prepared as and
from the several ingredients stated for treating paper or other suitable material
to render the same fit for electrical insulation.
Dated this 25th day of duanet 1800
FREDERIC PRINCE,
37, Cursitor Street, Chancery Lane, London, E.C.