Claims
- 1. A method for centrifugally producing glass fibers from a glass composition as follows:
- ______________________________________SiO.sub.2 61 to 72%Al.sub.2 O.sub.3 2 to 8%Fe.sub.2 O.sub.3 0.2 to 1%CaO 4.7 to 7.5%MgO 0 to 5%Na.sub.2 O + K.sub.2 O 14 to 18%B.sub.2 O.sub.3 0 to 6%F 0 to 1.5%BaO 0 to 2.5%ZrO.sub.2 0 to 2.5%Misc .ltoreq.1%______________________________________
- said method comprising the steps of introducing the glass in molten attenuable condition into a spinner for delivery to the interior surface of the peripheral wall thereof, said peripheral wall having a multiplicity of orifices therein, rotating said spinner to effect the centrifugal delivery of the glass through the spinner orifices in a multiplicity of streams, and attenuating said glass streams into fibers by means of an internal combustion burner providing a generally downwardly directed annular gaseous blast adjacent the exterior of said peripheral wall, said gaseous blast having an elevated temperature contributing to the maintenance of the glass streams in attenuable condition for a time sufficient to effect attenuation thereof, and wherein centrifugal acceleration at the spinner wall, the diameter of the spinner, the peripheral velocity of the spinner and the burner pressure fall within the following ranges:
- ______________________________________centrifugal acceleration 4000 m/sec.sup.2 to 20,000 m/sec.sup.2______________________________________Spinner diameter 550 mm to 1500 mmperipheral velocity 50 m/s to 130 m/sburner pressure 100 mm to 900 mm (water column).______________________________________
- 2. The method as claimed in claim 1 wherein the diameter of the spinner, the peripheral velocity of the spinner and the burner pressure fall within the following ranges:
- ______________________________________spinner diameter 550 mm to 1500 mmperipheral velocity 55 m/s to 90 m/sburner pressure 200 mm to 600 mm (water column).______________________________________
- 3. The method as claimed in claim 1 wherein the diameter of the spinner, the peripheral velocity of the spinner and the burner pressure fall within the following ranges:
- ______________________________________spinner diameter 600 mm to 1000 mmperipheral velocity 55 m/s to 90 m/sburner pressure 300 mm to 500 mm (water column).______________________________________
- 4. A method for centrifugally producing glass fiber insulating blanket from a glass composition as follows:
- ______________________________________SiO.sub.2 61 to 72%Al.sub.2 O.sub.3 2 to 8%Fe.sub.2 O.sub.3 0.2 to 1%CaO 4.7 to 7.5%MgO 0 to 5%Na.sub.2 O + K.sub.2 O 14 to 18%B.sub.2 O.sub.3 0 to 6%F 0 to 1.5%BaO 0 to 2.5%ZrO.sub.2 0 to 2.5%Misc .ltoreq.1%______________________________________
- said method comprising the steps of introducing the glass in molten attenuable condition into a spinner for delivery to the interior surface of the peripheral wall thereof, said peripheral wall having a multiplicity of orifices therein, rotating said spinner to effect the centrifugal passage of the glass through the spinner orifices in a multiplicity of streams, and attenuating said glass streams into fibers by means of an internal combustion burner providing a generally downwardly directed annular gaseous blast adjacent the exterior of said peripheral wall, said gaseous blast having an elevated temperature contributing to the maintenance of the glass streams in molten condition for a time sufficient to effect attenuation thereof, wherein the spinner diameter, the centrifugal acceleration at the spinner peripheral wall, the peripheral velocity of the spinner and the burner pressure fall within the following ranges:
- ______________________________________spinner diameter 550 mm to 1500 mmcentrifugal acceleration 4000 m/sec.sup.2 to 20000 m/sec.sup.2peripheral velocity 50 m/s to 130 m/sburner pressure 100 mm to 900 mmm (water column)______________________________________
- thereby producing fibrous insulation blanket having the following characteristics:
- ______________________________________fineness 2(5 g) to 5(5 g) micronaireconductivity 30 .times. 10.sup.-3 to 55 .times. 10.sup.-3 (W/m .degree.K.)density 8 to 75 (Kg/m.sup.3).______________________________________
Priority Claims (3)
Number |
Date |
Country |
Kind |
83400698 |
Apr 1983 |
EPX |
|
83400699 |
Apr 1983 |
EPX |
|
83 11631 |
Jul 1983 |
FRX |
|
CROSS REFERENCE TO RELATED APPLICATION
The present application is a continuation of our prior application Ser. No. 539,728, filed Oct. 6, 1983, now abandoned which is a continuation-in-part of our prior applications Ser. No. 409,336, filed Aug. 18, 1982 now U.S. Pat. No. 4,451,276 granted May 29, 1984 and Ser. No. 461,834, filed Jan. 28, 1983 abandoned.
US Referenced Citations (3)
Continuations (1)
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Number |
Date |
Country |
Parent |
539728 |
Oct 1983 |
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Continuation in Parts (2)
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Number |
Date |
Country |
Parent |
409336 |
Aug 1982 |
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Parent |
461834 |
Jan 1983 |
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