JPS57211547A - Seam detector for sheet including metal foil - Google Patents

Seam detector for sheet including metal foil

Info

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
Application number
JP9717781A
Other languages
Japanese (ja)
Inventor
Masaji Tatsumi
Tetsuo Tatsuno
Hideki Kobayashi
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Toppan Inc
Original Assignee
Toppan Printing Co Ltd
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by Toppan Printing Co Ltd filed Critical Toppan Printing Co Ltd
Priority to JP9717781A priority Critical patent/JPS57211547A/en
Publication of JPS57211547A publication Critical patent/JPS57211547A/en
Pending legal-status Critical Current

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.
JP9717781A 1981-06-23 1981-06-23 Seam detector for sheet including metal foil Pending JPS57211547A (en)

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)

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