| 摘要 |
<p>Glass fiber insulation products, and methods of manufacturing small diameter glass fibers with fewer stress-rising defects are provided. The insulation products of this invention can provide the same thermal resistance or R-valu e with reductions in fiber density of at least about 20% or more while achievi ng acceptable recovery of the nominal thickness following compression. The methods provided by this invention can produce fine diameter glass fibers wi th fewer defects through a combination of lower attenuating gas velocities and the use of spinners having more and smaller holes. A preferred method of the invention uses a device for internal centrifugation of mineral fibers including a centrifuge equipped with a peripheral bland perforated with orifices distributed in a plurality of annular zones (ZA) arranged on top of each other, assuming that the centrifufe is in centrifugation position. In accordance with the invention, the device also includes at least two annualr zones (ZA1, ZA2) whose number or orifices per unit of surface area (NS1, NS2 ) differs by a value greater than or equal to 5%, in particular greater than o r equal to 10%, and even 20%.</p> |
