RADIATION TRANSMISSION INSPECTION METHOD AND DEVICE, AND METHOD FOR MANUFACTURING MICROPOROUS FILM

WIPO Patent Application WO/2020/004435

A1

According to the present invention, when performing an x-ray transmission inspection using as the inspection subject a film reel in which a long film is wound multiple times around the outer circumferential surface of a core, foreign matter can be reliably detected by reducing the influence of a difference in detection sensitivity according to the position of the foreign matter. This radiation transmission inspection method includes: a first foreign matter inspection step for acquiring information about foreign matter by using a first detector to detect radiation which is emitted from a first radiation source to one side end portion A of the film reel and passes through the inside of the reel to be emitted from the other side end portion B; and a second foreign matter detection step for acquiring information about foreign matter by using a second detector to detect radiation which is emitted from a second radiation source to the other side end portion B of the film reel and passes through the inside of the reel to be emitted from the one side end portion A, where the one side end portion A is the side surface on one side of the reel and the other side end portion B is the side surface on the other side of the reel.

WATANABE MITSURU (JP)

PCT/JP2019/025288

January 02, 2020

June 26, 2019

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TORAY INDUSTRIES (JP)

G01N23/16

WO2016203330A1

2016-12-22

JP2018092890A	2018-06-14
JP2010127702A	2010-06-10
JP2004354215A	2004-12-16
JP2015044602A	2015-03-12
JPS6321039A	1988-01-28

See also references of EP 3816616A4

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