Title:
DETECTION OF POOR ADHESION FOR CORRUGATED BOARD SHEET
Document Type and Number:
Japanese Patent JPH01267404
Kind Code:
A
Abstract:
PURPOSE:To detect poor adhesion between a core paper and a liner in the production process of a corrugated board sheet by a handy method and accurately, by combining corrugation of the core paper thereof and an irradiating slit light. CONSTITUTION:A corrugated board sheet 10 being conveyed with a smooth liner paper 9 adhering continuously to a core paper 8a flute formed in corrugation is irradiated with a parallel slit light 14 from a slit light generator 13 across the entire paper width crossing flutes as arranged in rows askew from the direction vertical to the surface of the paper surface on the side of the corrugated core paper. A wave-shaped bright line 15 is formed at an intersection between the irradiated slit light 14 and said corrugated core paper 8a. When a partially poor adhesion or a totally poor adhesion occurs, the corrugation of the core paper 8a at the portion is deformed, hence presenting the bright line 15 lost in regularity. An image of the bright line is caught by a camera 16 to be processed with an image processor, thereby enabling detection of poor adhesion of the corrugated board sheet.
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Inventors:
TAKENAKA HIROYUKI
Application Number:
JP9619188A
Publication Date:
October 25, 1989
Filing Date:
April 19, 1988
Export Citation:
Assignee:
MITSUBISHI HEAVY IND LTD
International Classes:
G01B11/30; (IPC1-7): G01B11/30
Domestic Patent References:
| JPS62279931A | 1987-12-04 | |||
| JPS57147004A | 1982-09-10 |
Attorney, Agent or Firm:
Takao Karaki
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