| 摘要 |
PROBLEM TO BE SOLVED: To produce ultrafine fibers composed of a thermoplastic resin in high energy efficiency and workability. SOLUTION: An ultrafine fiber is produced by a heating and melting step to melt a thermoplastic resin by the irradiation with laser light 7 and an electrostatic spinning step to apply an electric potential to the molten part of the thermoplastic resin and collect the extended fiber with a collector 8. The application of electric potential to the molten part of the thermoplastic resin may be carried out by applying the potential between an electrode 2 for applying electric charge to the thermoplastic resin and the collector 8. As an alternative, a linear resin 1 capable of receiving laser beams 7 from a plurality of radiation directions is inserted into a hole 3 on the electrode part 2 and continuously supplied to the thermal melting part. A laser beam having a beam diameter of 2-50 times the average diameter of the linear resin can be used as the laser light 7. Ultrafine fibers having an average fiber diameter of≤5μm (especially 50-1,000 nm) can be produced by the method. COPYRIGHT: (C)2007,JPO&INPIT
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