Патент USA US3031727код для вставки
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.