JP2005091338A - Appearance inspection device for bottle including transparent label - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high-speed, high-performance appearance inspection device capable of performing discharging when a defective product is detected. <P>SOLUTION: A container linearly advancing in a production line is rotated once on an inspection stage by lateral grip conveyors, whereby a line sensor arranged on a side can take the image of the whole 360°-surface without missing. Since ultraviolet ray 320 nm and visible light differed in spectral characteristics are used in combination in the line sensor, even a transparent label can be inspected and determined. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to appearance quality inspection of bottles and PET bottles.

  In the food industry where everything is a thing, a complete appearance is required with the view that appearance abnormalities such as label tearing cause doubt in the contents.

  However, currently, imaging and inspection are being performed with several visible light cameras, but since the imaging is from the side of the line, there are problems such as blind spots from the camera before and after the traveling direction, and abnormalities such as tears and dirt cannot be detected. I have it.

  In addition, transparent labels, which have recently been increasing, are unable to recognize the boundary with the bottles of the main body, and are shipped uninspected, and there are problems of returns and complaints from the sellers.

  The problem to be solved is that the entire outer periphery of the bottle and bottle cannot be imaged on the production line.

  The problem to be solved is that the boundary between the transparent label and the bottle of the main body, which has recently been increasing, cannot be recognized, and an abnormality cannot be detected.

  The bottles and the like that are transported on the conveyor flow a liquid called a slider on the conveyor and can freely rotate and move. As shown in FIG. 1, the line sensor picked up from the side surface is caught by the right and left grip conveyors having different speeds and conveyed while being rotated, so that the entire outer circumference can be detected 360 degrees, so that it can be inspected without an unimaged portion. .

  As a result of the experiment, the transparent label material OPS and the container material PET can be separated in the ultraviolet region as shown in the spectrum diagram of FIG. Inspection discrimination can be performed by using the difference in the reflection amount of the single wavelength portion. Of course, the opaque label can be sufficiently determined by the visible light portion.

  In a line that produces 800 to 1000 pieces per minute, if there is a high-speed and high-performance appearance inspection device as described above, the product will be discharged if a defective product is detected. And no complaints, smooth sales, and trust in products.

  As shown in FIG. 3, it is most efficient to install it in front of the production line caser.

  FIG. 1 shows a system for imaging 360 ° of the outer circumference of the bottle and bottle of the present invention. The inspection bottle with label (3) flowing in the traveling direction (6) through the top chain conveyor (1) is sandwiched between the slow-feed grip conveyor (4) and the fast-feed grip conveyor (5) arranged on the left and right, and then rotated once. Then, it is transported while proceeding (7).

FIG. 3 shows the best equipment layout incorporating the present invention.
It is most effective to install the bottle on the production line in front of the caser device (23).

  FIG. 4 illustrates the line of FIG. 1 from the top. An ultraviolet / visible light line sensor camera device {circle around (25)} having 360 bottles with labels under inspection {circle around (10)} rotated 360 is provided. Full-scale imaging and inspection.

  FIG. 5 is an inspection system diagram of the present invention. The image captured in FIG. 4 is processed by a single-wavelength 320 nm line sensor (28) and a visible light line sensor (30) in the optical system. Compared with non-defective products and inspected The defective product is discharged out of the line by the defective product discharge device (26).

  Because it is small, it can be installed on an existing production line and can be used and adopted by most manufacturers. Moreover, the inspection accuracy is not comparable with conventional products.

  Explanatory drawing of rotation and conveyance with a grip conveyor.   Measured amount of spectral reflection of ultraviolet rays between PET and label.   Equipment layout of production line   Inspection equipment layout as seen from above   Inspection department system diagram

Explanation of symbols

▲ 1 ▼ Top chain conveyor ▲ 2 Guide rail ▲ 3 Labeled inspection bottle ▲ 4 ▼ Slow-feed grip conveyor ▲ 5 ▼ Fast-feed grip conveyor ▲ 6 ▼ Travel direction ▲ 7 ▼ Rotate forward ▲ 8 ▼ Progress ▲ 9 ▼ Guide rail ▲ 10 ▼ Bottle with label under inspection ▲ 11 ▼ Spectral characteristics of PET ▲ 12 ▼ Transparent label spectral characteristics ▲ 13 ▼ Colored label spectral characteristics ▲ 14 ▼ UV wavelength 270 nm
▲ 15 ▼ Identification wavelength 320nm
▲ 16 ▼ 370nm
▲ 17 ▼ 420nm
▲ 18 ▼ Reflection amount ↑ Large direction ▲ 19 ▼ Drink filling device ▲ 20 ▼ Cap tightening machine ▲ 21 ▼ Cap inspection device ▲ 22 ▼ Label inspection device with this device ▲ 23 ▼ Caser device for placing beverage in case ▲ 24 ▼ Lighting device ▲ 25 ▼ Ultraviolet / visible light line sensor camera device ▲ 26 ▼ Defective product discharge device ▲ 27 ▼ Lens ▲ 28 ▼ 320nm line sensor ▲ 29 ▼ Ultraviolet reflection visible light transmission mirror ▲ 30 ▼ Visible light line sensor ▲ 31 ▼ Visible Inspection section for light ▲ 32 ▼ Inspection section for transparent label ▲ 33 ▼ Defect determination section

Claims (2)

  A bottle or bottle that flows on the production conveyor is transported by a grip conveyor having a function to advance while rotating, and the line sensor camera arranged on the side surface picks up 360 degrees of the outer periphery of the object, so that an unimaged surface Inspection method that detects tears and dirt on the label without leaving behind.   Recently, in the inspection of transparent labels, which have been increasing on outer peripheral labels such as natural water, conventional visible light cameras cannot be distinguished because they have the same color. Therefore, a label inspection system that has the function of recognizing appearance abnormalities by focusing on the difference in the label material from the bottle and capturing images based on the difference in the amount of reflection of a single wavelength in the ultraviolet region.

Images