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Патент USA US3031727

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May 1, 1962
M. LEVECQUE ETAL
3,031,717
CENTRIF‘UGAL FIBER FORMING APPARATUS
Filed March 3, I958
INVENTORS
MARCEL
BY
LEVECQUE
PAUL PIOT
$46
ATTORNEY
tates Patent
"i
IC€
1
3,031,717
Marcel Levecque, Saint-Gratien, and Paul Piot, Deuil,
CENTRIFUGAL FIBER FGRMING APPARATUS
France, assignors to Compagnie de Saint-Gobain, a cor
poration of France
Filed Mar. 3, 1958, Ser. No. 718,654
Claims priority, application France Mar. 8, 1957
9 Ciaims. (Cl. 18--2.6)
3,031,717
Patented May 1, 1962
2
refractory material, preferably a refractory alloy, of good
mechanical characteristics, and an internal part 4 of a
wear-resistant material such as platinum or platinum-alloy.
The diameter of the openings 5 of part 4 is inferior to that
5 of the openings 6 of part 3 and it must be noted that the
rate of projection of glass is determined by the size of
openings 5.
The openings 6 may be cylindrical, as shown in FIG. 2,
or tapering as shown in FIG. 3.
The present invention relates to the manufacture of 10 The distributing device 2 may be similarly constructed
?bres from thermoplastic materials in the viscous state
and comprises an external part 7 ensuring good mechan
and particularly of glass ?bres.
ical behaviour and an internal wear-resistant part 8. The
In this manufacture, it is known to use a hollow body
openings 9 and 10 provided in the internal part 8 and
into which the molten material is fed and the periphery
in the external part 7 respectively may be arranged as de
of which is provided with ori?ces distributed in one or 15 scribed above for the openings 5 and 6 of the peripheral
several rows. This hollow body being rotated at big.
band.
speed around its own axis, the material is projected by
It must be understood that the present invention is not
centrifugal force out of the ori?ces of the peripheral band
limited to the embodiment above described and illustrated
in the form of streamlets which then undergo a drawing
which has been selected only by way of example.
20
effect which transforms them into ?bres.
What is claimed is:
vIt is also known to provide within, and co-axial with,
1. Apparatus for producing ?bers from molten thermo
the rotating body, a device shaped like a tank or trough of
plastic viscous material including a centrifuging body hav
perforated side-walls into which the material is fed and
ing a peripheral wall provided with a plurality of projec
serving to project said material onto the inside face of
tion ori?ces, said peripheral wall being formed of two ele
25
the peripheral band of the rotating body, and to dis
ments in contact with each other, the external element
tribute it evenly over the whole height of said band.
being made of a refractory alloy, ensuring good mechan
According to the present invention, the peripheral band
ical performance, and the internal element offering the
and/ or the side wall of the distributing device is made of
maximum resistance to wear in presence of the molten
two elements in contact with each other, the outside ele
thermoplastic
material, and with the ori?ces in the in
ment being made of a refractory material, and more par 30 ternal element having a smaller diameter than those in the
ticularly of a refractory alloy, ensuring good mechanical
external element so that the diameter of the ori?ces lo
performance, and the internal element offering the max
cated in said elements remain practically unchanged over
imum resistance to wear and permitting substantially con
long periods of use.
stant feed conditions whatever may be the extent of wear
2. An apparatus of the type set forth in claim 1 where
of the external element.
in the thickness of the external element is greater than
In the present invention, the quantity of material pro
the thickness of the internal element.
jected through the openings of the peripheral band and/or
3. An apparatus of the type set forth in claim l where
of the distributing device is kept substantially constant dur
in the ori?ces in the internal element have a cylindrical
ing the life of said band or of said distributing device, the
shape while the ori?ces of the external element have a
diameter of the openings which governs the feed condi
frusto conical shape.
tions remaining constant and equal to the diameter suit
4. An apparatus of the type set forth in claim 1 where
able for giving themost favourable feed conditions.
in the external and internal elements are directly ?tted one
In this connection it must be noted that the applicants
over the other.
have observed that, for an opening of 0.8 mm., a wear of
5. An apparatus of the type set forth in claim 1 where
the order of 0.1 mm. may bring about a feed increase of
45 in the external and internal elements are bonded one on
more than 50%.
the other.
According to an embodiment of the present invention,
6. An apparatus of the type set forth in claim 1 where
the external parts of the peripheral band and/ or of the wall
in the external and internal elements are bonded one on
of the distributing device are made of a refractory al’oy
whilst the internal parts are coated with a metal or alloy
chemically resistant to glass at working temperature, such
as platinum, platium-rhodium, tungsten, molybdenum or
the other with a suitable material interposed between said
elements.
7. An apparatus as set forth in claim 1 acting as a dis
tributing organ in conjunction with a surrounding hollow
centrifuge provided with a plurality of rows of ori?ces in
The external and the internal part can be directly ?tted
the lateral wall thereof, said organ being located inside
one over the other, or ?tted with interposition of a suitable
55 said last-mentioned centrifuge and spaced from said last
intermediary material.
mentioned wall.
If desired, the openings of the internal parts may be of
8. An apparatus according to claim 1 wherein the ex
a diameter less than that of the openings of the external
ternal element is a refractory alloy and the internal ele
parts. Thus, the external parts of refractory alloy of the
ment is a metal of the group consisting of platinum, plat
peripheral band can have openings of about 1 mm. diam
inum-rhodium, tungsten, molybdenum, and platinum
eter and the internal parts of glass-resistant alloy can have
nickel.
openings of about 0.5 to 0.6 mm. diameter. The internal
9. Apparatus for producing ?bers from a supply body
parts may be thinner than the external parts.
of molten glass including an outer centrifuging body hav
In the annexed drawings showing, by way of example, a
ing a peripheral wall provided with a plurality of outlet
preferred embodiment of the invention:
FIG. 1 is a cross-section through the rotating body and 65 ori?ces, said peripheral wall being formed of a refractory
its associated distributing device.
alloy resistant to heat, warpage and chemical attack, an
FIG. 2 is a section showing cylindrical ori?ces, and
internal element a?ixed to the inside surface of the periph
FIG. 3 is a similar section showing tapering ori?ces.
eral wall of the centrifuging body and provided with a
Referring now to FIG. 1, 1 is the rotating body and 2 70 series of ori?ces of smaller diameter than said ori?ces in
platinum-nickel.
its associated distributing device. The peripheral band
of the rotating body is made up of an external part 3 of
said peripheral wall of the centrifuging body and in axial
alignment therewith, said internal element offering max
3,031,717
4
3
imum resistance to heat, chemical attack and wear in the
presence of the molten glass, the refractory alloy consti
tuting the peripheral wall of the centrifuging body next
to the ori?ces of the internal element and therebetween
serving to support and maintain the metal of the internal
element against displacement and warpage in the presence
of high temperature and the revolution of the peripheral
wall of the outer centrifuging body and the internal ele
ment at high speeds.
References Cited in the ?le of this patent
UNITED STATES PATENTS
1,592,140
2,031,083
Horton et al. ________ __ July 13, 1926
Weller _______________ __ Feb. 18, 1936
2,133,236
Slayter et al ___________ __ Oct. 11, 1938
5
2,190,296
2,609,566
2,624,912
2,777,254
Slayter et a1. _________ __ Sept. 9, 1952
Heymes et a1‘; ________ __ Jan. 13, 1953
2,949,631
Kleist et a1 ____________ __ Aug. 23, 1960
205,437
Australia _____________ __ Dec. 27, 1956
France ______________ __ Oct. 11, 1956
Richardson ___________ __ Feb. 13, 1940
Siefert et al ___________ __ Jan. 15, 1957
FOREIGN PATENTS
1,124,487
OTHER REFERENCES
“Glass Fibersf’lby De Dani, in Chemistry and Industry,
pages 482-489, at pages 482 and 483, April 30, 1955 issue.
Published by the Society of vChemical Industry, London,
15 England.
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