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Glass inspection 1 JLI vision a/s Inspection systems Novel illumination methods.

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Presentation on theme: "Glass inspection 1 JLI vision a/s Inspection systems Novel illumination methods."— Presentation transcript:

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

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

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

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

5 Glass inspection 5 Glass systems Container Tableware Tube Tube ends Chips & cracks Preforms

6 Glass inspection 6 Measurements Dimensions Wall thickness Lengths Shapes

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

8 Glass inspection 8 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 Key challenges

9 Glass inspection 9 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. Programming

10 Glass inspection 10 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 Statistics

11 Glass inspection 11 Tableware inspection

12 Glass inspection 12 Lump edge - good

13 Glass inspection 13 Good edge

14 Glass inspection 14 Rim inspection DEMA

15 Glass inspection 15 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. Dynamic Light Box

16 Glass inspection 16 Checks

17 Glass inspection 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 Glass inspection 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 Glass inspection 19 NIR Tableware inspection

20 Glass inspection 20 NIR images 1991

21 Glass inspection 21 NIR and backlighting

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

23 Glass inspection 23 Line scan NIR CCD matrix camera backlighting NIR is reflected from neighbouringBackground lighting generates containers, generating false signalsno false reflections Light box Hot conveyor

24 Glass inspection 24 Signal 400 C 600 CTemp. 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. NIR signal response

25 Glass inspection 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 Glass inspection 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 inspection 27 Glass distribution by backlighting

28 Glass inspection 28 Special features

29 Glass inspection 29 Bird swing classification

30 Glass inspection 30

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

32 Glass inspection 32 Pharmaceutical glass

33 Glass inspection 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 Glass inspection 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 Glass inspection 35 SK 3000

36 Glass inspection 36 SK 3010 specifications Tube diameter: mm. Max wall thickness: 15% of tube diameter. Line speed: Metres / sec. Smallest detectable stone/knot: 0.05 mm. Shortest detectable airline length: 2 mm. Smallest airline width detected: 0.02 mm. Durable sodium street lighting with a service life of more than 5 years. Internet connection for remote servicing

37 Glass inspection 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 Glass inspection 38 Defect detection

39 Glass inspection 39 End formed tubes

40 Glass inspection 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

41 Glass inspection 41


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