Fabrics and meets therefrom.
Year: 1887

page_text: Date of Application, 8th Sept., 1887
Complete Specification Left, 7th July, 1888
Complete Specification Accepted, 10th Aug., 1888
Fabrics and meets therefrom.
I, CHARLES JACKSON, of 105 Wollaton Street, Nottingham, Engineer, do hereby
declare the nature of this invention to be as follows:-
--
This invention has for its object improvements in treating asbestos to obtain filter
mats and other fabrics and sheets therefrom.
I first prepare the asbestos in a fine fibrous condition and I blow this fibre into a
chamber together with a spray of varnish or suitable cementing material so that as
nearly as may be every fibre of the asbestos may be thinly coated with the cement. In
this state I allow the fibre to settle lightly down upon a travelling apron which slowly
conveys it away. When the varnish or cement is partly dry the material is lightly
pressed together and it is then placed in a stove and the varnish or cement is hardened.
The fabric will now be in the state of a very porous mat suitable to form a very open
filter bed. The fabric can be rendered closer to almost any desired extent by exposing
it to further heat and pressure..
If a non porous sheet be required I still in the first place prepare a porous mat as
above described and I afterwards close the fabric together by exposure to heavy
pressure between heated rollers or otherwise. In some cases having obtained the
porous mat I again apply varnish or cementing material to it. In consequence of the
open nature of the fabric this will be readily dried uniformly and sufficiently throughout
the thickness of the mat. The fabric is finished by stoving and pressing more or less
according to the density required.
Although I prefer the method above stated for uniformly applying the varnish or
cementing material to the fibre other means may be resorted to consistent with
retaining the fibre in the requisite open condition whilst it is exposed to the heat of
the stove.
1000

page_text: Improvements in Treating Asbestos to Obtain Filter Mats and other
Fabrics and Sheets therefrom.
I, CHARLES JACKSON of 105 Wollaton Street, Nottingham, Engineer, 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 has for its object improvements in treating asbestos to obtain filter
mats and other fabrics and sheets therefrom.
I first prepare the asbestos in a fine fibrous condition and I blow this fibre into a
chamber together with a spray of varnish or suitable cementing material so that as
nearly as may be every fibre of the asbestos may be thinly coated with the cement.
In this state I allow the fibre to settle lightly down upon a travelling apron which
slowly conveys it away. When the varnish or cement is partly dry the material is
lightly pressed together and it is then placed in a stove and the varnish or cement is
hardened. The fabric will now be in the state of a very porous mat suitable to form a
very open filter bed. The fabric can be rendered closer to almost any desired extent
by exposing it to further heat and pressure.
If a non-porous sheet be required I still in the first place prepare a porous mat as
above described and I afterwards close the fabric together by exposure to heavy
pressure between heated rollers or otherwise. In some cases having obtained the
porous mat I again apply varnish or cementing material to it. In consequence of the
open nature of the fabric this will be readily dried uniformly and sufficiently throughout
the thickness of the mat. The fabric is finished by stoving and pressing more or less
according to the density required.
Although I prefer the method above stated for uniformly applying the varnish or
cementing material to the fibre other means may be resorted to consistent with
retaining the fibre in the requisite open condition whilst it is exposed to the heat of
the stove.
In order that my said invention may be fully understood and readily carried into
effect I will proceed to describe more in detail the manner in which I prefer to operate.
I cause the asbestos fibre to be carried upon an endless apron to a spiked roller
revolving at a high velocity. The roller projects the fibre into a chamber into which
also at the same time a fine spray of the cementing material is projected. This is
done by a spray apparatus of well known form worked by a blast of air. The fibre
settles down on to a travelling apron at the bottom of the chamber. The apron moves
slowly forward at a speed which can be adjusted according to the thickness of the
sheet required. It passes beneath a roller or other presser by which the material is
lightly compacted together and the sheet is then removed to a drying room either at
the natural temperature or slightly warmed. Here it remains until the cement is to

page_text: some extent hardened and then the sheet is passed into a stove. The stove should be
heated to about 300 degrees Fahrenheit and the fabric remains in the stove for
some hours.
I can use various varnishes as the cementing material, Copal varnish for example is
suitable or where flexibility in the mat or sheet is of importance boiled linseed oil may
advantageously be employed. I use no more of the cementing material than is
necessary to hold the fibre together.
When I desire to produce a hard non-porous article I take the porous mat as it
comes from the drying room and pass it between heated rollers and after rolling it to
a sufficient extent I put it into the stove. Where further consolidation is required I
press the material between plates or in dies and I expose it whilst retained under
pressure to the heat of the stove. I keep it in the stove sufficiently long to prevent
the material expanding again when the pressure is relieved.
Sometimes when a dense material is required I take the porous mat after driving or
stoving, saturate it with cement and then dry it in the drying room.
When the cement is dry but still tacky I compress the material and whilst it is
compressed heat it in the stove until it is set.
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 is :-
1. The manufacture from asbestos of filter mats and like porous fabrics by coating
asbestos fibre with varnish or cement whilst the same is in an open uncompacted state,
then accumulating the coated fibre into a sheot, lightly pressing the material together
and hardening it in a stove substantially as described.
2. The manufacture from asbestos of filter mats and like porous fabrics by bringing
asbestos fibre whilst in an open uncompacted state into contact with a spray of varnish
or cement, then accumulating the fibre into a sheet, lightly pressing the material
together and hardening it in a stove substantially as described.
3. The manufacture from asbestos of non porous fabrics from porous fabric prepared
as herein described by submitting the same to pressure and heat substantially as
described.
D
A