| 摘要 |
PROBLEM TO BE SOLVED: To provide a production apparatus which can efficiently provide an ultrafine fiber nonwoven fabric having an ultrafine fiber diameter of 1 μm or less.SOLUTION: The production apparatus includes: rows of orifices 12 arranged at intervals in a row in a width direction for jetting a molten thermoplastic polymer to form a group of fibers; and a pair of first slit 8a, 8b disposed at both sides of the orifices 12 and for jetting hot air. The jetted hot air is introduced to join together at distal ends of the rows of the orifices 12. A pair of first walls 20a, 20b are disposed parallel at both sides of the hot air to have the joined hot air flow rectilinearly. Second walls 21a, 21b are disposed parallel outside the first walls. A pair of second slits 22a, 22b are formed to jet gas between the first walls and the second walls. Respective gases jetted from a pair of the second slits are introduced so as to jet parallel at both sides of the hot air. |
