JPS57211547A - Seam detector for sheet including metal foil - Google Patents
Seam detector for sheet including metal foilInfo
- Publication number
- JPS57211547A JPS57211547A JP9717781A JP9717781A JPS57211547A JP S57211547 A JPS57211547 A JP S57211547A JP 9717781 A JP9717781 A JP 9717781A JP 9717781 A JP9717781 A JP 9717781A JP S57211547 A JPS57211547 A JP S57211547A
- Authority
- JP
- Japan
- Prior art keywords
- seam
- coils
- metal foil
- sheet
- including metal
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N27/00—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means
- G01N27/72—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables
- G01N27/82—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws
- G01N27/90—Investigating or analysing materials by the use of electric, electrochemical, or magnetic means by investigating magnetic variables for investigating the presence of flaws using eddy currents
- G01N27/9013—Arrangements for scanning
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Measurement Of Length, Angles, Or The Like Using Electric Or Magnetic Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Magnetic Means (AREA)
- Controlling Rewinding, Feeding, Winding, Or Abnormalities Of Webs (AREA)
Abstract
PURPOSE:To make it possible for sure to detect a seam that has been electrically insulated and also to provide improved easiness of operation and simplification of electric circuit by setting up and a specified relation to the width of the seam the distance between a pair of coils that are opposed with a sheet inbetween them and the coil diameter. CONSTITUTION:A seam 3' is detected 9 by the electromagnetic induction method as a sheet 3 including a metal foil which has an electrically insulated seam 3' and the thickness of which is 20mu or less is made to travel. In this case, a pair of coils 2 and 4 that are opposite to each other with the sheet 3 inbetween them are provided and the distance between the coils and their diameters are set at below 2/3 of the seam 3' or over the width of the seam 3'. With this arrangement, the seam 3' is detected for sure by the induction voltage in each of the coils.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9717781A JPS57211547A (en) | 1981-06-23 | 1981-06-23 | Seam detector for sheet including metal foil |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP9717781A JPS57211547A (en) | 1981-06-23 | 1981-06-23 | Seam detector for sheet including metal foil |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS57211547A true JPS57211547A (en) | 1982-12-25 |
Family
ID=14185295
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP9717781A Pending JPS57211547A (en) | 1981-06-23 | 1981-06-23 | Seam detector for sheet including metal foil |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS57211547A (en) |
-
1981
- 1981-06-23 JP JP9717781A patent/JPS57211547A/en active Pending
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