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1. WO2007005402 - FIBERIZING SPINNER FOR THE MANUFACTURE OF LOW DIAMETER, HIGH QUALITY FIBERS

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WHAT IS CLAIMED IS:
1. A spinner for use in fiberizing thermoplastic fibers, comprising:
a peripheral sidewall having a height and a plurality of orifices formed in said sidewall wherein, said orifices are formed in a band on an upper portion of said sidewall and define an upper foraminous band and a lower substantially non-foraminous band.
2. The spinner of claim 1 , wherein said substantially non-foraminous band is at least 10% of the height of the sidewall.
3. The spinner of claim 1, wherein said foraminous band is at least 50% of the height of the sidewall.
4. The spinner of claim 1 , wherein said foraminous band is at least 75% of the height of the sidewall.
5. The spinner of claim 1 , wherein said foraminous band is at least 90% of the height of the sidewall.
6. A method of improving the k- value of glasswool comprising the steps of:
determining the column angle of a spinner to minimize the thermal conductivity of fibrous insulation batts produced from a spinner; and
manufacturing .
7. The spinner of claim 6, wherein the column angle is approximately 30°.
8. The spinner of claim 6, wherein the column angle is approximately 22°.
9. The spinner of claim 6, wherein the column angle is approximately 45°.
10. The spinner of claim 6, wherein the column angle is approximately 68°.
11. A spinner for the manufacture of glasswool, comprising:
a rotatable peripheral sidewall; and
a plurality of orifices penetrating said sidewall, said orifices being aligned at a
predetermined column angle;
wherein the column angle is selected based on experimentation to minimize the thermal conductivity of fibrous insulation produced therefrom.
12. The spinner of claim 11 , wherein the column angle improves the k- value of the glasswool by at least about 2 k-points with respect to glasswool of a similar fiber diameter. 13. The spinner of claim 11 , wherein the column angle is approximately 30°.
14. The spinner of claim 11, wherein the column angle is approximately 22°.
15. The spinner of claim 11 , wherein the column angle is approximately 45°.
16. The spinner of claim 11 , wherein the column angle is approximately 68°.

17. The spinner of claim 11 , further comprising:
a nonforminous band positioned at the lower end of said rotatable peripheral sidewall.
18. The spinner of claim 17, wherein said nonformainous band is between about 10% and 50% of the height of the sidewall.
19. The spinner of claim 17, wherein said foraminous band is at least 75% of the height of the sidewall.
20. The spinner of claim 11 , wherein the column angle improves the k- value of the glasswool by at least about 1.5 k-points with respect to glasswool of a similar fiber diameter.