PRIMARY AIR SYSTEM FOR MELT SPRAY DIE DEVICE

摘要

PURPOSE: To provide a melt blown die apparatus for producing a fibrous web from a polymer material. CONSTITUTION: This apparatus includes a die and a primary gas assembly for providing a pressurized gas at the exit end of the die. The primary gas assembly includes a tubular chamber for receiving and distributing the pressurized gas along the first dimension of the die. The tubular chamber includes a pressure control diverter for providing a substantially even gas pressure distribution across the first dimension of the die. The apparatus can be operated at exit air flow rates of up to about 86 kg (200 pounds) of air per pound of polymer at a polymer flow rate of about 1.82 kg (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.