Bushing for use in extruding fibers

Abstract

Abstract A BUSHING FOR USE IN EXTRUDING FIBERS UNDER PRESSURE FROM HIGH TEMPERATURE MELTABLE MATERIAL, SUCH AS MOLTEN GLASS. THE BLUSHING INCLUDES A PLURALITY OF TINY AND CLOSELY SPACED ORIFICES THROUGH WHICH THE MATERIAL IS EXTRUDED. THERE ARE DESCRIBED HEREIN VARIOUS GEOMETRICAL CONFIGURATIONS FOR BUSHINGS WHICH PERMIT THE USE OF A THIN WALL AT THE ORIFICE AREA WHICH CAN BE SUBJECTED TO HIGH INTERNAL PRESSURE WITH RELATIVELY LOW STRESS ON THE WALL. THE WALL OF THE BUSHING AT THE ORIFICE AREA PREFERABLY HAS A THICKNESS LESS THAN SEVERAL TIMES THE DIAMETER OF AN ORIFICE. ONE CONFIGURATION IS IN THE FORM OF A FOLDED OR PLEATED RIBBON OF THIN METAL, THE RIBBON PROVIDING ONE OR MORE APEXES EACH HAVING ONE OR MORE ORIFICES THROUGH WHICH THE MATERIAL IS EXTRUDED. ANOTHER CONFIGURATION PROVIDES A CIRCULAR WALL IN THE FORM OF A SECTION OF A TOROID AT THE ORIFICE AREA, AND ANOTHER PROVIDES PLURAL DIMPLE-LIKE ORIFICE AREAS SUBSTANTIALLY IN THE FORM OF SECTIONS OF SPHERES. FOR GLASS FIBER EXTRUSION, THE BUSHING TYPICALLY IS MADE FROM A THIN SHEET OF HIGH TEMPERATURE RESISTANT MATERIAL, SUCH AS PLATINUM, PLATINUM ALLOYS, OR OTHER SUITABLE METALS OR ALLOYS. D R A W I N G

Inventors

• 👤 Edward T Strickland
• 👤 Homer C Amos

Bibliographic Details