Improvements in Plastic Compositions and Method of Moulding same.
Year: 1890

page_text: Date of Application, 27th June, 1890
Complete Specification Loft, 26th Mar, 1901 Accepted, 2nd May,
4004
PROVISIONAL SPECIFICATION.
Improvements in Plastic Compositions and Method of Moulding
same.
I AVON GRAY Featherstone Road Kings Heath in the County of Worcester
do hereby declare the nature of this invention to be as follows :-
:-
The object of this invention is to harden or solidify paper, wool or cotton either
separately or together.
For this purpose I mix the paper, cotton or wool or the mixture of same with
a binding material of a glutinous or resinous nature such as shellac in solution or
otherwise or stoving varnish and after partially evaporating the binding material
by exposure to the air or a slow heat, to press or mould into shape required and
continue to destroy the binding material by air or by greater pressure in heated
moulds or presses or by a process of stoving until the material is quite solid.
I also mix a certain amount of metal with the paper, wool or cotton for some
purposes.
Dated this 26th day of Lun 1800
COMPLETE SPECIFICATION.
Improvements in Plastic Compositions and Method of Moulding
same.
I AVON GRAY Featherstone Road Kings Heath County of Worcestershire Com-
mission Agent 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 :-
The object of this invention is to harden or solidify paper, wool, or cotton either
together or separately.
In order that my invention may be fully understood and readily carried into
effect I hereby describe the method in which I prefer to work. I commence either
with the paper torn up very fine, and the cotton or wool in its raw state; or with
the paper in sheets and the cotton or wool woven into a fabric according to the
article to be made. For small articles I prefer the former, and for large ones
or sheets of the composition where great mechanical strength is required, the
latter.
I then saturate the paper, wool or cotton in a binding material such as shellac in
solution or a stoving varnish and mould into the shape required. I then place in a
room through which a current of air passes or a slow heat in order to dry the
composition leaving it about a fortnight to dry. I then place it in a metal mould
of the shape required and subject it to a heavy pressure. After pressing in this
state I again saturate the article with the binding material and leave another
fortnight or thereabouts to dry.
When thoroughly dry I again place in the metal mould and subject it to a much
heavier pressure of several tons to the square inch. I next place the article in an
oven heated to about 250 deg. Fahrenheit for about 10 hours I then return it to the
moulds heated this time to 250 or 300 degrees and give it the same heavy pressure
in order to completely destroy the binding material.
After hot pressing I again place in the oven for about 10 hours.
After leaving the oven the article may be smoothed and polished ready
for usc.

page_text: Having now particularly described and ascertained the nature of my said inven-
tion, and in what manner the same is to be performed I declare that what I
claim is
(1) The manufacture of articles of paper cotton or wool together or separately
hardened by mixing with a binding material and subjected to heavy pressure &
heat.
(2) The manufacture of sheets of the composition by mixing paper, cotton or
wool together or separately with a binding material.
(3) The combination of paper cotton and wool and a binding material of shellac
in solution or stoving varnish subjected to heat and heavy pressure making a hard
solid material of great strength and durability.
Dated this 24th day of March 1891.
AVON GRAY.