PRIMARY AIR SYSTEM FOR A MELT BLOWN DIE APPARATUS

摘要

Melt-blown die apparatus are provided for producing a fibrous web from a polymer material. The apparatus includes die means and primary gas means for providing a pressurized gas at an exit end of the die means. The primary gas means includes tubular chamber means 34 for receiving and distributing the pressurized gas along a first dimension of the die. The tubular chamber means includes pressure control diverter means 32 for providing a substantially even gas pressure distribution across the first dimension of the die means. This apparatus can be operated at exit air flow rates of up to about 200 pounds of air per pound of polymer at a polymer flow rate of about 4.0 pounds per linear die inch per minute. Constructions are provided for minimizing bending moments and for providing thermal and structural stability to the apparatus.