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Title:
MELT-BLOWN NONWOVEN FABRIC, USE OF SAME, AND METHOD FOR PRODUCING SAME
Document Type and Number:
WIPO Patent Application WO/2019/059360
Kind Code:
A1
Abstract:
Provided are: a melt-blown nonwoven fabric which is lightweight and thick, while having excellent uniformity and recyclability, and which is suitable for use as a sound-absorbing material; a method for producing this melt-blown nonwoven fabric; and a sound-absorbing material which is configured using this melt-blown nonwoven fabric and exhibits good sound absorption performance in a medium frequency range of from 500 Hz to 2,000 Hz or in a high frequency range of 2,000 Hz or higher. A melt-blown nonwoven fabric which is produced from a propylene resin starting material, and which is characterized in that: the melt-blown nonwoven fabric is formed from propylene resin fibers that have an average fiber diameter of from 0.7 μm to 4.0 μm and an accumulated frequency of fibers having a fiber diameter of more than 2.0 μm of 5% or more; and the melt-blown nonwoven fabric has a ventilation volume of from 1 cc/cm2·sec to 15 cc/cm2·sec and a water retention rate of 200% or less as determined in accordance with JIS L 1913 (2010). A sound-absorbing material according to the present invention comprises this melt-blown nonwoven fabric. This melt-blown nonwoven fabric is produced by setting the distance between a molten propylene resin ejected from a spinning nozzle of a melt blowing apparatus and the surface of a screen carrier, on which the molten propylene resin is accumulated, to 45 cm or more.

Inventors:
MIYATA TOMOHIRO (JP)
WATANABE MASAYUKI (JP)
KOSUGE KAZUHIKO (JP)
Application Number:
PCT/JP2018/035123
Publication Date:
March 28, 2019
Filing Date:
September 21, 2018
Export Citation:
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Assignee:
O WELL CORP (JP)
International Classes:
D04H3/16; D04H3/007
Domestic Patent References:
WO2017110057A12017-06-29
Foreign References:
JP2017515010A2017-06-08
JP2000148157A2000-05-26
JP2013147771A2013-08-01
JP2014059537A2014-04-03
JP2017066575A2017-04-06
Attorney, Agent or Firm:
NAKAYAMA, Mitsuko (JP)
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