cloud-runnerMeasurement of MottlingSandra Weixel, BYK-Gardner GmbH7th Eurocar Congress, Barcelona – November 2011
Mottling / Cloudiness of Metallic Coatingsirregular areas of lightness variation                                         ●...
Causes and Cloud typesOrientation cloudsDisorientation influenced by wetting behaviour,rheology additive or application me...
Causes and Cloud typesThickness cloudsThickness variations result in poor hiding Clear Coat Base CoatThickness variations ...
Mottling / Cloudiness of Metallic CoatingsHow is it evaluated today ?      ● There is a high interest in objectively measu...
Perception of MottlingDepending on illumination, viewing angle, distance and sizePage 6, BYK-Gardner GmbH, cloud-runner
Evaluation of MottlingWhich pattern size is perceived as mottle?       ● Experts and non-experts mainly recognize mottle s...
How to measure MottlingScanning the mottle pattern       scanning 10 …100 cmPage 8, BYK-Gardner GmbH, cloud-runner
MeasurementOptical principle                            Illumination     Detection 15°                    15° to perpendic...
MeasurementMinimize the influence of tilting                           Illumination   Detection +15°                   15°...
MeasurementMinimize the influence of tilting                           Illumination   Detection +15°                   15°...
MeasurementCloud rangesThe signal is separated by mathematical filters:Visibility                                         ...
Evaluation of MottlingWhich pattern size is perceived as mottle?          Small Mottles                    Large Mottles  ...
Evaluation of MottlingTexture & Mottling        Small Mottles                     Large Mottles                           ...
Evaluation of MottlingTexture & Mottling                                 Mottling is dominated by the max value of the lar...
Evaluation of MottlingTexture & Mottling - 2 dimensional graph                            12                              ...
Evaluation of MottlingTexture & Mottling - 2 dimensional graph                            12                              ...
Evaluation of MottlingTexture & Mottling                           12                                                     ...
Evaluation of MottlingTexture & Mottling                      12                      11                      10          ...
Evaluation of MottlingColors with Different Texture                      10                           15°                 ...
Mottle-ChartExample: Medium Class Models                           12                           11                        ...
Mottle-ChartExample: Medium Class Models                           12                                                     ...
Mottle-ChartExample: Light metallic - Model 1                           12                                                ...
Mottle-ChartExample: Light metallic - Model 2                           12                                                ...
Evaluation of Mottling: White TricoatProcess Variations      15°   10                             Left Front Door         ...
Irregular mottle distributionMeasurement Hints        ● Recommended sample area ~ 30 x 50 cm        ● 10 scans in 1 - 2 cm...
Example:Striping and Measurement Direction                                          Paint application                     ...
ExampleStriping and Measurement Direction     Silver                                                                      ...
Data Analysis with smart-chart softwareProcess Stability: Group by ColorPage 30, BYK-Gardner GmbH, cloud-runner
Data Analysis with smart-chart softwareProcess Stability: Selected Color shows IndividualsPage 31, BYK-Gardner GmbH, cloud...
Data Analysis with smart-chart softwareProcess Stability: Details shows Harmony     ●         Limit Curve: defined by the ...
New: cloud-runner     Ideal tool for the production line                                          ● Docking station:      ...
Thank you for your attentionVisit us in Hall 6 – Stand G-713
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Sandra Weixel - Cloud-runner Measurement of Mottling

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Cloud-runner Measurement of Mottling

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Sandra Weixel - Cloud-runner Measurement of Mottling

  1. 1. cloud-runnerMeasurement of MottlingSandra Weixel, BYK-Gardner GmbH7th Eurocar Congress, Barcelona – November 2011
  2. 2. Mottling / Cloudiness of Metallic Coatingsirregular areas of lightness variation ● undesirable defect at effect coatings ● especially noticeable on large body panels ● most obvious on light metallic finishesPage 2, BYK-Gardner GmbH, cloud-runner
  3. 3. Causes and Cloud typesOrientation cloudsDisorientation influenced by wetting behaviour,rheology additive or application method Clear Coat Base CoatDisorientation influenced by interaction betweenclearcoat and basecoat: Strike-in effect Clear Coat Base CoatPage 3, BYK-Gardner GmbH, cloud-runner
  4. 4. Causes and Cloud typesThickness cloudsThickness variations result in poor hiding Clear Coat Base CoatThickness variations result in partial hidingat grazing angle Clear Coat Base CoatPage 4, BYK-Gardner GmbH, cloud-runner
  5. 5. Mottling / Cloudiness of Metallic CoatingsHow is it evaluated today ? ● There is a high interest in objectively measuring “mottling”. ● In R&D applications multi-angle spectrophotometers are used to measure lightness variation by “scanning” surface point by point. ● Very time consuming (fingerprint system analysis) ● Some companies have developed cloud reference panels as a ranking tool. ● Most companies perform a visual checkPage 5, BYK-Gardner GmbH, cloud-runner
  6. 6. Perception of MottlingDepending on illumination, viewing angle, distance and sizePage 6, BYK-Gardner GmbH, cloud-runner
  7. 7. Evaluation of MottlingWhich pattern size is perceived as mottle? ● Experts and non-experts mainly recognize mottle sizes between 50 to 100 mm. Extremes ranged from 25 to 200mm. ● Therefore, for visual inspection and measurement a min. sample area of about 300 x 500 mm is recommended. 100mm 200mm 50mm 25mmPage 7, BYK-Gardner GmbH, cloud-runner
  8. 8. How to measure MottlingScanning the mottle pattern scanning 10 …100 cmPage 8, BYK-Gardner GmbH, cloud-runner
  9. 9. MeasurementOptical principle Illumination Detection 15° 15° to perpendicular Specular Reflection Detection 45° Detection 60° Spot size approx. 4x4 mmPage 9, BYK-Gardner GmbH, cloud-runner
  10. 10. MeasurementMinimize the influence of tilting Illumination Detection +15° 15° to perpendicular Specular Reflection Detection -15° Sample surfacePage 10, BYK-Gardner GmbH, cloud-runner
  11. 11. MeasurementMinimize the influence of tilting Illumination Detection +15° 15° to perpendicular Specular Reflection Detection -15° Object Curvature Sample surface radius > 500 mmPage 11, BYK-Gardner GmbH, cloud-runner
  12. 12. MeasurementCloud rangesThe signal is separated by mathematical filters:Visibility Mottle Size min. scanlength Md 6 - 13 mm Me 11 - 24 mm Mf 19 - 42 mm 130 mm Mg 33 - 72 mm 230 mm Mh 57 - 126 mm 420 mm Mi 100 - 200 mm 750 mmPage 12, BYK-Gardner GmbH, cloud-runner
  13. 13. Evaluation of MottlingWhich pattern size is perceived as mottle? Small Mottles Large Mottles 10 9 8 7 6 5 4 3 2 1 0 Md Me Mf Mg Mh 6-13mm 11-24mm 19-42mm 33-72mm 57-126mmPage 13, BYK-Gardner GmbH, cloud-runner
  14. 14. Evaluation of MottlingTexture & Mottling Small Mottles Large Mottles 12 10.0 11 Sample 1 9.0 Probe_1 10 Sample 3 8.0 9 Sample 5 Large Mottles (LM) 15° Probe_3 8 7.0 7 6.0 Probe_5 6 5.0 5 4.0 4 3.0 3 2.0 2 1.0 1 0.0 0 6-13mm M15d 11-24mm M15e 19-42mm M15f 33-72mm M15g 57-126mm M15h 0 1 2 3 4 5 6 7 8 9 10 11 12 M15d M15e M15f M15g M15h Small Mottles (SM) 15° Small Mottles = (Md + 0.5Me) / 1.5Page 14, BYK-Gardner GmbH, cloud-runner
  15. 15. Evaluation of MottlingTexture & Mottling Mottling is dominated by the max value of the large mottles10.0 9.0 8.0 7.0 Large Mottle: avg. max. 6.0 Sample A 3.8 4.6 5.0 Sample B 3.7 3.8 4.0 3.0 2.0 1.0 LM = (0.5Mf + max (Mg,Mh)) /1.5 0.0 6-13mm 11-24mm 19-42mm 33-72mm 57-126mm M15d M15e M15f M15g M15h SM = (Md + 0.5Me) / 1.5Page 15, BYK-Gardner GmbH, cloud-runner
  16. 16. Evaluation of MottlingTexture & Mottling - 2 dimensional graph 12 kaum sichtbare 11 Wolkigkeit 10 Visual Ranking: sichtbare 9 Wolkigkeit Large Mottles (LM) 15° 8 clearly noticeable 7 deutlich sichtbare visible Wolkigkeit 6 5 hardly to recognize 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Small Mottles (SM) 15°Page 16, BYK-Gardner GmbH, cloud-runner
  17. 17. Evaluation of MottlingTexture & Mottling - 2 dimensional graph 12 kaum sichtbare 11 Wolkigkeit 10 Visual Ranking: sichtbare 9 Wolkigkeit Large Mottles (LM) 15° 8 clearly noticeable 7 deutlich sichtbare visible Wolkigkeit 6 5 hardly to recognize 4 3 2 1 0 0 1 2 3 4 5 6 7 8 9 10 11 12 13 Small Mottles (SM) 15°Page 17, BYK-Gardner GmbH, cloud-runner
  18. 18. Evaluation of MottlingTexture & Mottling 12 kaum sichtbare 11 Wolkigkeit 10 Visual Ranking: sichtbare 9 Wolkigkeit M Mottles (LM) 15° 8 clearly noticeable Large– Mottling 15° 7 deutlich sichtbare visible Wolkigkeit 6 5 hardly to recognize 4 3 M = LM * ( 1 - 0.05 * T ) 2 1 T = SM - 6 0 -6 0 -5 1 -4 2 -3 3 -2 4 -1 5 0 6 1 7 2 8 3 9 4 10 5 11 6 12 7 13 T - Texture 15° Small Mottles (SM) 15°Page 19, BYK-Gardner GmbH, cloud-runner
  19. 19. Evaluation of MottlingTexture & Mottling 12 11 10 Visual Ranking: 9 8 clearly noticeable M – Mottling 15° 7 visible 6 5 hardly to recognize 4 3 M = LM * ( 1 - 0.05 * T ) 2 1 T = SM - 6 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 7 T - Texture 15°Page 20, BYK-Gardner GmbH, cloud-runner
  20. 20. Evaluation of MottlingColors with Different Texture 10 15° 15° 10 60° 60° 10 10 9 White Pearl 9 Silver 9 White Pearl White Pearl 9 Silver 8 8 8 8 7 7 7 7 6 6 6 6 5 5 5 5 4 4 4 4 3 3 3 3 2 2 2 2 1 1 1 1 0 0 0 Md Me Mf Mg Mh Mi Md Me Mf Mg Mh Mi Md Me Mf Mg Mh Mi 0 Md Me 0f Mg Mh Mi 20 15° 10 60° 18 Black Pearl 9 Black Pearl 16 8 14 7 12 6 no mottling visible 10 5 8 4 under 60° angle 6 3 4 2 2 1 0 0 Md Me Mf Mg Mh Mi Md Me Mf Mg M6 Mi White Pearl Black Pearl Silver White Pearl Black Pearl Silver 10 10 9 9 8 8 7 7 6 6 Mottling 60° Mottling 15° 5 5 4 4 3 3 2 2 1 1 0 0 -6 -4 -2 0 2 4 6 8 10 12 14 -6 -4 -2 0 2 4 6 8 10 12 14 Texture15° Texture 60°Page 21, BYK-Gardner GmbH, cloud-runner
  21. 21. Mottle-ChartExample: Medium Class Models 12 11 Karossen 10 Body panels 9 Wolken deutlich sichtbar 8 Mw - Mottling 15° M – Mottling 15° 7 6 5 4 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 T - Texture 15° Mc - Mottling CoveragePage 22, BYK-Gardner GmbH, cloud-runner
  22. 22. Mottle-ChartExample: Medium Class Models 12 Karossen 11 10 Body panels Anbauteile 9 Add-on parts Wolken deutlich 8 sichtbar Mw - Mottling 15° M – Mottling 15° 7 6 5 4 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 T - Texture 15° Mc - Mottling CoveragePage 23, BYK-Gardner GmbH, cloud-runner
  23. 23. Mottle-ChartExample: Light metallic - Model 1 12 Karosse 11 10 Body panels Anbauteile 9 Add-on parts Wolken deutlich 8 sichtbar Mw - Mottling 15° M – Mottling 15° 7 6 5 4 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Mc - Mottling Coverage T - Texture 15°Page 24, BYK-Gardner GmbH, cloud-runner
  24. 24. Mottle-ChartExample: Light metallic - Model 2 12 Karosse 11 10 Body panels Anbauteile 9 Add-on parts Wolken deutlich 8 sichtbar Mw - Mottling 15° M – Mottling 15° 7 6 5 4 3 2 1 0 -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 Mc - Mottling Coverage T - Texture 15°Page 25, BYK-Gardner GmbH, cloud-runner
  25. 25. Evaluation of Mottling: White TricoatProcess Variations 15° 10 Left Front Door Plant 1 15° 10 Left Rear Door 9 9 Plant 2 8 8 7 Plant 3 7 6 Plant 4 6 5 5 Plant 5 4 4 3 Plant 6 3 2 2 1 1 0 0 Md Me Mf Mg Mh Mi Md Me Mf Mg Mh Mi 10 60° 10 Left Front Door 60° Left Rear Door 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0 Md Me Mf Mg Mh Mi Md Me Mf Mg Mh MiPage 26, BYK-Gardner GmbH, cloud-runner
  26. 26. Irregular mottle distributionMeasurement Hints ● Recommended sample area ~ 30 x 50 cm ● 10 scans in 1 - 2 cm distance ● min. scanlength: 42 cm for Mh 23 cm for Mg & MPage 27, BYK-Gardner GmbH, cloud-runner
  27. 27. Example:Striping and Measurement Direction Paint application Scan directionPage 28, BYK-Gardner GmbH, cloud-runner
  28. 28. ExampleStriping and Measurement Direction Silver M 15° Left Hood Right Hood Door10 10 15° 9 9 8 8 7 7 6 6 5 5 4 4 3 3 2 2 1 1 0 0 M15d M15e M15f M15g M15h M15i -6 -5 -4 -3 -2 -1 0 1 2 3 4 5 6 6-13mm 11-24mm 19-42mm 33-72mm 57-126mm 100-200mm T - Texture 15° Page 29, BYK-Gardner GmbH, cloud-runner
  29. 29. Data Analysis with smart-chart softwareProcess Stability: Group by ColorPage 30, BYK-Gardner GmbH, cloud-runner
  30. 30. Data Analysis with smart-chart softwareProcess Stability: Selected Color shows IndividualsPage 31, BYK-Gardner GmbH, cloud-runner
  31. 31. Data Analysis with smart-chart softwareProcess Stability: Details shows Harmony ● Limit Curve: defined by the Tolerance settings ● Target Curve: indicates potential direction for improvementPage 32, BYK-Gardner GmbH, cloud-runner
  32. 32. New: cloud-runner Ideal tool for the production line ● Docking station: - Recharging of battery packs - Data transfer to PC ● USB port for data transfer to PC ● Software smart-chart: - Organizer files for sample ID - Data management with DB - Standard QC ReportsPage 35, BYK-Gardner GmbH, cloud-runner
  33. 33. Thank you for your attentionVisit us in Hall 6 – Stand G-713

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