Title:
【発明の名称】製造中の連続紙の縁裂け目を検知する装置
Document Type and Number:
Japanese Patent JPS63502613
Kind Code:
A
Abstract:
PCT No. PCT/FR86/00442 Sec. 371 Date Jun. 30, 1987 Sec. 102(e) Date Jun. 30, 1987 PCT Filed Dec. 23, 1986 PCT Pub. No. WO87/04248 PCT Pub. Date Jul. 16, 1987.Device for detecting insipient cracks or tears on the edges (4) of a moving sheet (5), of the type comprising: a light source (6), and a receiving cell for picking up the light transmitted by the source (6) through the sheet (5) moving between the source (6) and the cell, characterized in that: on the one hand, the light source (6) is a laser source; and on the other hand, the receiving cell (17) is an optoelectronic cell placed in such a way that the solid angle under which the serviceable surface of said cell (17) or of its image by an optical system, can be seen from the sheet, is less than 0.01 steradian.
Inventors:
Mackerel, jack
Bourdin, Serge
Bourdin, Serge
Application Number:
JP50040686A
Publication Date:
September 29, 1988
Filing Date:
December 23, 1986
Export Citation:
Assignee:
Center Technic Industries Industrial Paper Carton Esserlos
International Classes:
D21F7/04; G01N21/89; G01N21/892; (IPC1-7): D21F7/04; G01N21/89
Attorney, Agent or Firm:
Masatake Shiga