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Inspection systems Novel illumination methods

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Presentation on theme: "Inspection systems Novel illumination methods"— Presentation transcript:

1 Inspection systems Novel illumination methods
JLI vision a/s Inspection systems Novel illumination methods

2 JLI vision a/s Founded in 1985 1.000 + systems in operation
High end advanced turnkey systems System integrators No other business than vision systems

3 JLI vision a/s Main business areas: Medical device inspection Glass
Steel Special applications

4 Glass systems Falls into two main categories:
Precise dimensional measurements Self calibrating dimensions down to mm Inspection systems Fault detection Statistical production control Validated systems up to FDA standard

5 Glass systems Container Tableware Tube Tube ends Chips & cracks

6 Measurements Dimensions Wall thickness Lengths Shapes

7 Defect detection Cracks Chips Mould rings Birdswings Inclusions
Blisters Airlines Cord

8 Key challenges Scene – how to get images with high contrasts
Illumination – how to enhance the defects you want to find, or obtain sharp images for reliable measurements

9 Programming If you get a good image the programming is easy
If you have been working with inspection for more than 30 years you will have a solid base of programmes for all applications.

10 Statistics Vision systems are optical measurement devices
Statistical data is collected and displayed – trend graphs and measurements Image storage of faults Internet connection for remote data processing and presentation

11 Tableware inspection

12 Lump edge - good

13 Good edge

14 Rim inspection DEMA

15 Dynamic Light Box Three different illumination patterns are necessary to find all defects The dynamic light box is programmed by the vision system Up to 25 patterns and analysis can be performed pr. second.

16 Checks

17 Dynamic Light Box Flexible and remote controlled structured lighting
Excellent for fine tuning inspection Fine tuning can be done remotely When new models are introduced the engineers can help the operators adjusting the system

18 NIR or backlighting Examples of where Near Infra Red can be used
Drawbacks and inherent problems NIR images are blurred and noisy NIR technology is not cheap

19 NIR Tableware inspection

20 NIR images 1991

21 NIR and backlighting

22 Line scan CCD matrix camera
Light box Hot conveyor Linescan generates the image Matrix camera takes a snapshot by moving the object past the camera

23 Line scan NIR CCD matrix camera backlighting
Light box Hot conveyor NIR is reflected from neighbouring Background lighting generates containers, generating false signals no false reflections

24 Signal NIR signal response 400 C C Temp. X Mass Radiation related to temperature times mass on a middleweight container. Low temperature and thin wall gives a very small signal. High temperature and thick wall drives the CCD chip into saturation. It is difficult to obtain a good dynamic range.

25 Problems with light weight containers
NIR relies on radiation from the container The radiation is a function of wall thickness and temperature Temperature depends on cooling in the cavities and transport time on the hot conveyor The NIR signal from lightweight containers is poor.

26 Backlighting Using backlighting, the glass distribution can be assessed with a resolution better than 0.1 mm on green and amber glass And it works equally well on hot and cold containers – this makes testing easy

27 Glass distribution by backlighting

28 Special features

29 Bird swing classification


31 Two blisters The tolerances are set to: 1 mm2 for the largest defect.
5 mm2 for the sum of defects. 5 for numbers of defects. Gedevelop AB Florettgatan 27 SE Helsingborg Sweden Phone: Fax:

32 Pharmaceutical glass

33 Pharmaceutical glass Glass is used extensively for medicine
FDA has recently focused on the quality of the glass tubing used for pharmaceutical products To make fault free glass containers you need high quality tubing No airlines and no stone and knots

34 PDA Technical Report 43 Parenteral Drug Association
Identification and Classification of Nonconformities in Molded and Tubular Glass Containers for Pharmaceutical Manufacturing The purpose of this technical report is to provide consistent, standardized quality criteria that can be used by pharmaceutical companies for the visual inspection of incoming glass containers.

35 SK 3000

36 SK 3010 specifications Tube diameter: 1.0 - 50 mm.
Max wall thickness: % of tube diameter. Line speed: Metres / sec. Smallest detectable stone/knot: mm. Shortest detectable airline length: mm. Smallest airline width detected: mm. Durable sodium street lighting with a service life of more than 5 years. Internet connection for remote servicing

37 Defect / reject relations
4 airlines max 25 mm in length within one length is acceptable AND 2 airlines max 50 mm in length within one length is acceptable AND 1 airline max 100 mm in length within one length is acceptable. Stone & knot inspection is set in a similar way. An example: 4 stones/knots above 0.1 mm in diameter is acceptable AND 1 stone/knot above 0.3 mm in diameter is acceptable AND 0 stones/knots above 1 mm in diameter is acceptable

38 Defect detection

39 End formed tubes

40 Summery JLI makes the high end vision systems
The tailor made systems that needs engineering and adaptations The “impossible” jobs All systems are delivered with a functional guarantee and a “no cure no pay” clause


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