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Microfilament manufacturing method and manufacturing apparatus therefor

Foreign code F110005744
File No. P07-001US
Posted date Sep 13, 2011
Country United States of America
Application number 52269808
Gazette No. 20100148406
Gazette No. 8057730
Date of filing Jan 9, 2008
Gazette Date Jun 17, 2010
Gazette Date Nov 15, 2011
International application number JP2008050103
International publication number WO2008084797
Date of international filing Jan 9, 2008
Date of international publication Jul 17, 2008
Priority data
  • P2007-000964 (Jan 9, 2007) JP
  • P2007-227981 (Sep 3, 2007) JP
  • 2008WO-JP50103 (Jan 9, 2008) WO
Title Microfilament manufacturing method and manufacturing apparatus therefor
Abstract (US8057730)
The objective of the present invention is to enable a microfilament that is a nanofilament to be manufactured continuously and consistently from all thermoplastic polymers without requiring a specialized high precision•high performance apparatus and also to present the nanofilament manufactured as described.
The present invention comprises a microfilament in a nanofilament region and the manufacturing means thereof wherein a original filament transferred using a filament transfer means is supplied to an orifice under pressure P1 and is heated and drawn using an infrared light beam directly under the orifice under pressure P2 (P1>P2).
Scope of claims [claim1]
1. A method for manufacturing a microfilament, comprising the steps of supplying an original filament to an orifice under P1 pressure using a filament transfer means, then heating the filament under P2 pressure (P1>P2) using an infrared light beam and drawing the filament, wherein drawing tension is generated by a gas flow derived from a pressure difference between P1 and P2, wherein the center of said infrared light beam is radiated on the original filament within 30 mm of the exit of the orifice, and wherein the pressure difference between P1 and P2 before and after said orifice is P1 >= 2P2.
[claim2]
2. A method for manufacturing a microfilament according to claim 1, wherein the draw ratio in said drawing step is at least 10,000, and the filament diameter after the drawing is less than 1 mu m.
[claim3]
3. A method for manufacturing a microfilament according to claim 1, wherein said pressure P2 is lower than 101.3 kPa.
[claim4]
4. A method for manufacturing a microfilament according to claim 1, wherein the air speed inside said orifice is at least 342 m/sec.
[claim5]
5. A method for manufacturing a microfilament according to claim 1, wherein said infrared light beam is used to heat the center of said original filament within a 4 mm range up and down along the filament axis.
[claim6]
6. A method for manufacturing a microfilament according to claim 1, wherein when the internal diameter D of the exit section and the diameter d of said original filament satisfies the relationship 1.2d<D<10d.
[claim7]
7. A method for manufacturing a non-woven fabric comprising the microfilament according to claim 1, obtained by accumulating said drawn filament on a moving conveyer.
[claim8]
8. A method for manufacturing a laminated material and a cloth-like material of the microfilament according to claim 1, obtained by accumulating said drawn filament on said cloth-like material in motion.
[claim9]
9. A method for manufacturing a microfilament according to claim 1, wherein said drawn filament is continuously wound.
[claim10]
10. A manufacturing apparatus for a microfilament comprising; an original filament supply chamber under pressure P1 containing a means to transfer the original filament,
an orifice positioned in said original filament supply chamber through which said original filament passes,
a drawing chamber, connected to said original filament supply chamber through said orifice, within which said original filament that passed through said orifice is heated using an infrared light beam and drawn, and wherein the drawing chamber under pressure P2 wherein the pressure difference between P1 and P2 is P1 >= 2P2 and drawing tension is generated by a gas flow derived from the pressure difference,
and an infrared ray irradiation device that radiates said infrared light beam so that the center of the light beam focuses on said original filament within 30 mm of the exit of said orifice.
[claim11]
11. A manufacturing apparatus for a microfilament according to claim 10, wherein the pressure difference is set so that the air speed inside said orifice is at least 342 m/sec.
[claim12]
12. A manufacturing apparatus for a microfilament according to claim 10, wherein said original filament supply chamber is under atmospheric pressure and said drawing chamber is under reduced pressure.
[claim13]
13. A manufacturing apparatus for a microfilament according to claim 10, wherein the apparatus is constructed so that the light beam radiated from said infrared light beam irradiation device focuses on the center of said original filament within 4 mm range up and down along the filament axis direction.
[claim14]
14. A manufacturing apparatus for a microfilament according to claim 10, wherein said infrared light beam is a laser beam and said infrared ray irradiation device is a laser emitter.
[claim15]
15. A manufacturing apparatus for a microfilament according to claim 10, wherein said infrared ray irradiation device contains a mirror that reflects the same light beam and irradiates said original filament from multiple locations on said original filament.
[claim16]
16. A manufacturing apparatus for a microfilament according to claim 10, wherein said infrared ray irradiation device contains multiple light sources that irradiate said original filament from multiple locations.
[claim17]
17. A manufacturing apparatus for a microfilament according to claim 10, wherein the internal diameter D of said orifice exit, said original filament diameter is d and D and d satisfy the relationship 1.2d<D<10d.
[claim18]
18. A manufacturing apparatus for non-woven fabrics comprising the microfilament according to claim 10, wherein said apparatus is constructed so that a moving conveyer is installed in said drawing chamber and said drawn filament is allowed to accumulate on said conveyer.
[claim19]
19. A manufacturing apparatus for a microfilament according to claim 10, wherein said drawing chamber is equipped with a filament winding device.
  • Inventor, and Inventor/Applicant
  • SUZUKI AKIHIRO
  • UNIVERSITY OF YAMANASHI
IPC(International Patent Classification)
U.S. Cl./(Sub)
  • D02J001/22
  • D04H003/00
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