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Патент USA US2405576

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Aug. 13, 1946.~
M. D. HEYMAN
2,405,576
INTEGRATED MICA AND METHOD OF MAKING THE SAME
Filed June 3, 1945
IN VEN TOR.
M0555 0 HHM/w
BY
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ATTORNEY
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2,405,576
Patented Au¢.13,~1946 t
UNITED sTATEs PATENT OFFICE
2,405,578
INTEGRATED MICA AND METHOD 0F
MAKING THE SAME
Moses D. Herman, Cedarhurst, N. Y., assigner,
by mesne assignments. to Integrated Mica Cor
poration, Woodmere, N. Y., a corporation of
New York
Application June 3, 1943, Serial No. 489,478
11 Claims. (Cl. 12S-24)
1
This invention relates to the forming of mica
sheets from either blocks or particles of mica, and
has for its primary object the manufacture of
sheets of mica of indefinite size without the use
of any binder, so that the resultant product is
truly a sheet of pure mica.
In this way, the sheet of mica will have sub
stantially all of the desirable properties of origi
nal mica, which is only found in its natural state
in relatively small crystals.
2
In the drawing:
Fig. 1 is a flow diagram showing the means for
fabricating mica sheets in accordance with the
invention.
Fig. 2 is a plan view of such a sheet.
Fig. 3 is an enlarged cross-sectional view as
taken on the line 3--3 of Fig. 2.
Describing the invention in greater detail, a
quantity of mica blocks of varying size and thick
10 ness, or even mica scrap, is subjected to the `
cleansing action of Water or other fluids. The
cleansing may be accomplished in more than one
and pressure, using a binder such as shellac, copal, ' stage, if desired, to rid the imica. of dirt, stones
or any other impurities. The cleansed mica may
varnish, etc. However, the presence of these
binders deleteriously affects many of the original 16 then be dried in drying ovens to rid the pieces of
all moisture. Having been thus cleansed, the
properties of the mica, such as its resistance to
In order to make larger sheets, mica is usually
split into thin layers and put together under heat
`heat and its electrical properties, such as its
power factor, etc.
mica is preferably fed to a splitting device I0,
which is shown in its present preferred form.
use of a binder, so that a. pure mica, sheet is ob
provided respectively with lower and upper cham
tained..
Through years of research and experiment the
opening I4, formed by at least one in-reaching
This splitter preferably comprises a casing II,
By means of the present process, mica, which
can be mica scrap, is separated into lamina and 20 having a hollowed-out portion which is shaped
like a figure eight. Thus the casing II may be
then replaced in contiguous relation, without the
hers I 2 and I 3 and a communicating restricted
applicant has found that when a piece of mica 25 wall I5 of the casing. This wall should prefer
ably come to a substantially sharp edge so that
is split and then is pressed together again quickly,
when a stream of liquid under high pressure
the splittings wil1 recohere with substantially the
strikes the edge it will be divided, the parts of the
same force as held them together before they`
stream moving in the direction of the arrows. In
were split apart. This was found particularly true
of very thin splittîngs. When a piece of mica is 30 this manner, the stream of liquid wil more or
less follow the contour of the ñgure eight. There
split, there are presented two virgin surfaces.
will then be a crossing of currents at the re
However, if these surfaces should be touched by a
iinger or any other substance, such as a knife, or
stricted opening I4 when the liquid from the right
if they should be exposed to the open air for any
length of time, they can n0 longer be made to
recohere. No amount of cleansing the surfaces
will reestablish the coherlng force. It follows
then that if mica can be split apart without
marríng or contaminating the surfaces in any
hand wall of the upper chamber cuts across the
stream from the lower chamber. The high pres
put together and will form a perfect mica sheet.
though it has been found that distilled water
sure liquid from the stream leaving the high
pressure nozzle I6 will further cause a continu
ous turbulence at this point.
The liquid preferred to be used as the liquid
_shape or form, the thin layers can once more be 40 medium in the splitter is methyl alcohol, al
which has had the air driven therefrom is also
The following sets forth the prime requisites for
quite effective.
making integrated mica:
In actual operation, mica will be dropped' into
First: The surfaces of the mica splittings must
45 the liquid and will rest at the bottom of chamber
be virgin.
I2. The action of jet I6 will be such as to divide
Second: 'I'he splittings must not be permitted
the stream at the edge I5 and this action will
to be contaminated.
carry the mica, around in a counter-clockwise
Third: The mica when split must be very thin,
manner. The natural path of the mica will be
preferably to a thickness of M0000 of an inch or
50 from the bottom of chamber I2 around the right
less.
hand side of said chamber. The mica will then
As`- a result of the research on the primary
have a tendency to follow the left hand side of
facts as herein stated, the applicant has conceived
the upper chamber Il. However, when a piece
a method of fabricating mica as further described
of mica approaches the restricted opening, it will
and as shown in a semi-diagrammatic manner
55 strike the turmoil of cross currents which will
in the accompanying drawing.
2,405,576
twist and twirl the piece of mica around and the
jet I6 will have many opportunities to strike the
edge of the mica, thus splitting it. The mica
will then pass around the contour of wall I5. The
velocity of the mica piece after being struck by
the jet IS will be high, but 'the velocity of the
.liquid in chamber i2 or I3'wili be much lower.
This will again have a further tendency to split
the mica. After passing around the contour of
chamber I3, the mica piece will once mare come
within the path of the',-jet I6 and will again be
twisted and tniried by* the eddy-current set up
5. The method of forming a sheet of mica which
consists in cleansing pieces of mica t0 rid the
same of impurities and foreign particles, freeing
the mica pieces of moisture, splitting said pieces
while they are immersed in a medium which ob
viates contamination of the surfaces of the mica
splittings, and forming a stratified sheet of said
splittings while they remain immersed in said
medium.
`
~
6. The method of forming a sheet of mica
which consists in cleansing pieces of mica to rid
the same of impurities and foreign particles, free
ing the mica pieces of moisture, splitting said
in the restricted opening. Therefore, it will once
more be split and sent int'o chamber I5. This
pieces while they are immersed in a medium
process will continue until the particles of mica. 15 which obviates contamination of the surfaces of
are so thin that they will eventually ñoat up into
the mica splittings, forming a stratified sheet of
the vented outlet |1- and thence to the opening I8.
said splittings while they remain immersed in
A pervious member 20 is provided upon which
said medium, and subjecting said sheet to heat
the thin mica flakes are deposited and they are
and pressure to hasten evaporation of the immers
built thereon into a sheet of desired thickness. 20 ing medium.
When the built-up sheet 2l is removed from imà
7. The method of forming a sheet of mica
mersion in the liquid, a stratified sheet structure
which consists in cleansing pieces of mica to rid
has formed and thus the contiguous surfaces of
the same of impurities and foreign particles, free
lhe flakes or laminae, being uncontaminated, Will
ing the mica pieces of moisture, splitting said
pieces while they are immersed in methyl alcohol,
and forming a stratified sheet of said splittings
while they remain immersed in said methyl a1
cohol.
filtered and distilled can be re-circulated.
8. The method of forming a sheet of mica
The various devices necessary to. carry out the 30 which consists in cleansing pieces of mica to rid
steps of the method may be readily provided by
the same of impurities and foreign particles,
skilled persons and the degree .of iineness of the
freeing the mica, pieces of moisture, splitting said
mica splittings may be achieved in either a single
pieces While they are immersed in methyl alcohol,
stage splitter, as described, or by providing one
forming a stratified sheet of said splittings while
of multiple stages as is evident.
. they remain immersed in said methyl alcohol,
It is further understood that although methyl
and subjecting said sheet to heat and pressure to
alcohol or distilled Water is at present preferred
hasten evaporation of the immersing medium.
as the immersion medium,. other liquids may
9. A fabricated laminated mica sheet compris
prove to be equally effective for the purpose.
ing extremely thin laminae having virgin sur
Having thus described my invention, what I 40 faces, said laminae being arranged in random
claim as new and desire to protect by Letters Pat
fashion whereby their surfaces are in contiguous
ent is:
relation and enabling the natural cohesive forces
1. The method of forming mica sheets which
resident in the laminae to become effective, and
consists in splitting mica into iine splittings in
whereby the laminated sheet differs from a nat
methyl alcohol and depositing said splittings while 45 ural mica sheet in that the laminae are relatively
cohere and form an integrated sheet of mica. It
is desirable that the liquid be expelled from be
tween the laminae and this can be done by ap
plying heat and pressure. The _liquid after being
immersed in said methyl alcohol upon a pervious
surface.
smaller and frequently lie in more than one plane.
10. The method of forming mica sheets which
consists in separating the laminae of a natural
mica sheet into fine splittings in a liquid medium
2. The herein-described method of splitting
’nica which consists in subjecting pieces of mica
to a splitting force while said pieces are im
50 whereby the virginity of the surfaces of said split
mersed in methyl alcohol.
tings is retained to retain the natural cohesive
3. The herein-described method of splitting
forces of the mica splittings, and depositing said
mica which consists in placing pieces of mica in
splittings upon a pervious surface while immersed
a fluid medium within a chamber, and applying
in said liquid medium.
a jet pressure upon said fluid and mica pieces to
1l. The method of fabricating mica sheets
induce a circulation thereof whereby the pressure
which consists in subjecting pieces of mica to a
of the jet is directed upon said mica pieces to
splitting force while said mica pieces are im
cause splitting thereof.
mersed in a liquid medium whereby the virginity
4. The herein-described method of splitting
of the surfaces of the resulting mica splittings is
mica which consists in placing mica pieces in
retained to retain the natural cohesive forces of
60
a chamber containing methyl alcohol, and apply
the mica pieces, and depositing said mica split
ing a jet pressure upon said methyl alcohol and
tings upon a pervicus surface While said splittings
mica pieces to induce a circulation thereof where
remain immersed in said liquid medium.
by the pressure of the jet is directed upon said
MOSES D. HEYMAN.*nica pieces to cause the same to split.
65
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