Improvements in the Manufacture of India Rubber Thread.
Year: 1890

page_text: Date of Application, 15th Aug., 1890
Complete Specification Left, 11th May, 1891-Accepted, 20th June, 1891
PROVISIONAL SPECIFICATION.
Improvements in the Manufacture of India Rubber Thread.
We CHARLES MACINTOSH AND COMPANY LIMITED of Cambridge Street
Manchester in the County of Lancaster India Rubber Manufacturers and JOHN
BAGNALL of the same place Manager do hereby declare the nature of this invention
to be as follows:-
India rubber threads as at present made are cut from sheets of rubber manu-
factured by being spread in a plastic state with naptha or by being rolled in a
calender with or without naptha or by a combination of both processes.
These processes are known by manufacturers to be defective inasmuch as the
kneading or softening which the rubber has to undergo, causes a reduction of
strength to the rubber, and because of the difficulty of producing sheets of the exact
thickness or count required.
This invention consists in the manufacture of indiarubber thread from shects cut
from a solid block.
The rubber is taken in its pure and cleaned state and mixed in the usual way
with the proper proportion of sulphur.
It is then made up into rolls of a suitable length and diameter, by passing
it through the rolling machine, for the block press; after which it is placed in the
press, and by means of screw or hydraulic power it is pressed into a solid cylindrical
block (we prefer cylindrical).
This cylindrical block by means of a mandril passed through the centre is then
cut into sheets of the required thickness in a machine such as is usually employed
in cutting fine sheet rubber.
These are then vulcanized, and afterwards wound upon a roller, and cut into
threads in the ordinary manner.
By the use of this process we claim to make a thread entirely without the use of
naphtha, and also the thread is stronger and more durable because the material has
been less worked and kneaded in the process of manufacture; and also we can
produce from the block, by cutting the sheets more exactly, the thickness of sheet
required, than by the rolling or spreading processes at present employed, or by both
combined.
Dated this 14th day of August 1890.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
COMPLETE SPECIFICATION.
Improvements in the Manufacture of India Rubber Thread.
We CHARLES MACINTOSH AND COMPANY LIMITED of Cambridge Street
Manchester in the County of Lancaster India Rubber Manufacturers and JOHN
BAGNALL of the same place Manager 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 :-
India rubber threads as at present made are cut from sheets of rubber manu-
factured by being spread in a plastic state with naphtha or by being rolled in a
calendar with or without naphtha or by a combination of both processes.
These processes are known by manufacturers to be defective inasmuch as the
kneading or softening which the rubber has to undergo, causes a reduction of

page_text: strength to the rubber, and because of the difficulty of producing sheets of the
exact thickness or count required.
This invention consists in the manufacture of india rubber thread from sheets cut
from a solid block.
The rubber is taken in its pure and cleaned state and mixed in the usual way
with the proper proportion of sulphur.
It is then made up into rolls of a suitable length and diameter by passing it
through the rolling machine for the block press after which it is placed in the
press, and by means of screw or hydraulic or other sufficient power it is pressed
into a solid cylindrical block (we prefer cylindrical).
This cylindrical block by means of a mandrel passed through the centre is then
cut into sheets of the required thickness in any suitable machine.
These are then vulcanized, and afterwards wound upon a roller, and cut into
threads in the ordinary manner.
By the use of this process we claim to make a thread entirely without the use of
naphtha, and also the thread is stronger and more durable because the material. has
been less worked and kneaded in the process of manufacture; and also we can
produce from the block by cutting the sheets more exactly the thickness of sheet,
required, than by the rolling or spreading processes at present employed, or by
both combined.
Having now particularly described and ascertained the nature of our said inven-
tion and in what manner the same is to be performed we declare that what we
claim is :-
The manufacture of india rubber thread from sheets cut from solid blocks
substantially as hereinbefore described
th day of May 1891.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.
GEO. DAVIES & SON,
4, St. Ann's Square, Manchester, Agents for the Applicants.