Primary air system for a melt blown die apparatus
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United States of America Patent
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-
Jan 14, 1992
Grant Date -
N/A
app pub date -
Aug 29, 1990
filing date -
Aug 29, 1990
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
Melt blown die apparatus are provided for producing a fibrous web from a polymer material. The 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. 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.
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