Title:
DEFECT DETECTING METHOD FOR CAN COVER INSIDE COATING FILM AND DEVICE THEREFOR
Document Type and Number:
Japanese Patent JP3122958
Kind Code:
B2
Abstract:
PURPOSE: To measure a defect of a can cover coating film and the defect position speedily and accurately.
CONSTITUTION: When a defect is detected on a coating film surface of a can cover 1 formed by using the coating film surface side as the inside surface, the can cover 1 is held by a contact electrode 13 coming into contact with a can cover outside surface while turning the coating film surface downward, and electrolyte is injected and stuck on the coating film surface from an electrode nozzle 36 keeping a prescribed interval to the coating film surface. Voltage is impressed between the electrode nozzle 36 and the contact electrode, and while rotating the can cover 1 around the central shaft, the electrode nozzle 36 is moved relatively toward the center of the can cover from outside in the radial dirtection of the can cover 1, and a value of an electric current flowing in the electrolyte is detected with every prescribed pitch, and a coating film defect on a can cover inside surface and the position thereof are detected.
Inventors:
Masami Takamatsu
Yasuo Yoneyama
Yasuo Yoneyama
Application Number:
JP25063192A
Publication Date:
January 09, 2001
Filing Date:
August 26, 1992
Export Citation:
Assignee:
Daiwa Seikan Co., Ltd.
International Classes:
G01N27/20; (IPC1-7): G01N27/20
Domestic Patent References:
| JP62242848A | ||||
| JP4952685A | ||||
| JP638653U | ||||
| JP59112152U |
Attorney, Agent or Firm:
Kazuo Furukawa