light based measurement for light weight cans · 2017. 11. 8. · future sencon capability feature...
TRANSCRIPT
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Light Based Measurement for Light Weight Cans
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The Future is Lighterweight of a 12 oz. can will reduce to about 9g in 2020!
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Lightweighting means…(also called downgauging)
• Reduced costs
• Reduced energy use and emissions (CO2)
• Lightest metal containers possible while meeting the performance requirements of customers and consumers.
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Lower Weights Need
• Tighter specifications / tolerances
• Improved process capability (Cpk)
• Better measurement (Gauge R&R)
• More attributes controlled
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Gauge Capability • Measured using statistical methods as
Reproducibility and Repeatability and known as Gauge R&R
• “Gauge R&R … measures the amount of variation in the measurement system arising from the measurement device and the people taking the measurement.”
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Any gauging system is subject to variability due to limitations of the gauge (repeatability) and operator influence (reproducibility)
Spre
ad o
f re
sult
s
Arbitrary scale
Gauge Capability
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Gauge capability is expressed as a percentage (%R&R) of the process variation
Arbitrary scale
Spre
ad o
f re
sult
s
UP
PER
LIM
IT
LOW
ER L
IMIT
%R&R
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As process parameters get tighter, keeping the same gauge capability means higher (worse) %R&R
Arbitrary scale
Spre
ad o
f re
sult
s
UP
PER
LIM
IT
LOW
ER L
IMIT
Tighter process control …
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Tighter process parameters demand better gauge capability
Arbitrary scale
Spre
ad o
f re
sult
s
UP
PER
LIM
IT
LOW
ER L
IMIT
… demands better gauging
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Human Error
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Observer Effect
observing a situation or phenomenon necessarily changes that phenomenon.
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Non Contact Inspection Techniques
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General advantages of Non Contact Tech
Less maintenance
Lower lifetime costs
Improved
Gauge
Capability
Reduces drift and
deterioration
No risk of product
distortion
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Proven Reliability
• Optical Ends gauges – June 2001
• over 50 installations over the world
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World leader in coatings measurement
Over 25 years experience
Continual improvement
Capacitive option still
offered
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• 3 year R&D partnership with a leading UK university
• Custom optical metrology technique specially designed for measuring coatings on cans
Optical Gauge
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Infrared interferometry
including black inkalso matte
and practical method for tactile lacquers
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Internal & External Coatings
• Over-varnish on colored inks • Matt• Tactile
More complex
Less complex
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Sencon Shell Gauge
a step-change in performance
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Fast measurement savespress downtime
• High speed laser scanning delivers a step change in measurement speed.
• Measurements taken at 2 points to 64 points
• Example: 16 point results delivered in around a 1/3 of the time of competing systems
Contact measurement
Non-Contact measurement
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Each laser pass = 2 data point sets
2 passes gives 4 radial data sets
24 shell batch in <9 minutes
1 2
Laser scan
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Measurement Station
Thickness
setting piece
Upper
Surface
laser
No time lost for changeover
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Back End Gauge
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The Sencon Solution
The Sencon Solution
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VisualizationsNeck area graph with 150 curves
Dome reform data
3D model generated from
neck measurement data
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Feature Sencon non-contact
Contact gauges
Plug diameter (A) P P
Flange width (B) P P
Open can height (C) P P
Minimum stand diameter (D) P O
Dome depth (E) P P
Reform diameter (G) P P
Reform Height (H) P O
Reform eccentricity & concentricity P O
Seaming Clearance (J) “J dimension” P O
Measures what’s needed
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Future Sencon capability
Feature Sencon non-contact
Contact gauges
Body diameter (F) P O
Flange angle (I) P O
Shoulder height (K) P O
Neck angle (L) P O
Flange radius (M) P O
… using the existing measurement data set
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The right technology for the task
End Progression Gauge micro-focussed laser
illuminated probe
Dome Reform Gauge laser
Back End Gauge micro-focussed laser
illuminated probe
Optical Coatings Gauge infra-red
interferometry
Optical Shell Gauge laser
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Thanks!