The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Dec. 10, 2019
Filed:
Aug. 21, 2015
Toray Industries, Inc., Tokyo, JP;
Daiki Shimada, Otsu, JP;
Youhei Nakano, Otsu, JP;
Yoshikazu Yakake, Kyoto, JP;
Takuji Kobayashi, Otsu, JP;
Toray Industries, Inc., Tokyo, JP;
Abstract
A melt-blown nonwoven fabric includes a fiber containing a thermoplastic resin, wherein apparent density is 0.1 to 0.4 g/cmand KES surface roughness of at least one surface of the fabric sheet is up to 1.2 μm; and a method of producing the fabric includes conveying a web of the nonwoven fabric by sandwiching the web between two belt conveyers each including a belt having a smooth surface, providing a heat treatment zone where a surface of one or both of the belt conveyers has been heated to a temperature not lower than cold crystallization temperature of the thermoplastic resin and not higher than the temperature −3° C. lower than melting temperature of the thermoplastic resin in at least a part of a course between the belts, and heating the nonwoven fabric web in the heat treatment zone by contacting both surfaces of the nonwoven fabric web with the belt.