FILM DAMAGE DETECTOR AND METHOD OF DETECTING DAMAGE OF FILM

Title:

FILM DAMAGE DETECTOR AND METHOD OF DETECTING DAMAGE OF FILM

Document Type and Number:

Japanese Patent JP2007260497

Kind Code:

A

Abstract:

To provide a film damage detector which enables detecting fine damage flaws of widths of ≤0.2 mm with high precision and a method of detecting damage of a film.

The detecting method comprises adding an iron type coagulant to raw water 10 from a coagulant injection device 8 arranged in the raw water tank 2 so that the concentration of iron ion in the raw water 10 reaches 10-30 mg/L, generating nanobubbles of diameters of 0.01-1 μm in the raw water 10 by using a nanobubble generator 11, introducing the raw water 10 involving the nanobubbles into a membrane module 4 to filter through a filtration membrane 10 so as to remove target matter and detecting leakage of the nanobubbles into the filtrate having passed through the filtration membrane 7 by a nanobubble detector 12.

Inventors:

TSUJIMOTO WATARU
MITANI KAZUYUKI
NIEKAWA HIROSHI
TAMURA TSUGIO

Application Number:

JP2006085898A

Publication Date:

October 11, 2007

Filing Date:

March 27, 2006

Export Citation:

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Assignee:

NIPPON STEEL CORP
SOGO KANKYO KAIHATSU KK

International Classes:

B01D65/10; B01D61/10; B01D61/20; C02F1/44

Attorney, Agent or Firm:

Nobuyuki Hayashi
Yasuhiko

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