buyer recommendation & supply chain

8/3/2019 Buyer Recommendation & Supply Chain

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Colour and Textile Products

Colour Control in supply Chain

Jay Instruments & Systems Pvt. Ltd.


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Does Buyer recommendationreally work ?

Authored: Manish Kapadia


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Key complex processes in supply chain


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Key multi-variables of Color in supply chainQuality gets defined not by mere model purchase


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Enemies of consistent textile color control

Color measurements are highly sensitive to

Temperature (thermochromism) & Humidity

Instrument Geometry Sensor, Optical design &Electronics Aging of Instrument Environment Dust & Lighting (to some extent) Inter-instrument Agreement

Shade of the measured color

Key multi-variables of Color in supply chainQuality gets defined not by mere model purchase


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Thermochromism


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Colour Control in supply ChainHumidity

The effects of humidity are lessdramatic on non-textile surfaces.

Still, as a wet road appears darker thanwhen dry, so too will physical standardsalter their look if they are not maintainedunder standard conditions.Textiles are usually hygroscopic, &monsoons can be crazy !Material, brought to the lab for analysis,must be conditioned before tests are

performed. The same is true ofmeasuringdevices which should be aged untilthey are stable in the laboratoryenvironment.Except in extreme cases, this simplymeans allowing the items to reach roomtemperature. More care must be taken

in the heat of summer, or the cold ofwinter.


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Standard conditions in textile color control

As digital color measurements (CIELAB) are highly sensitive toTemperature & Humidity, the process has involved standardizingspectrophotometers across the globe using ceramic tiles the moststable reference material available.All dyed colors are measured after conditioning in the VindonUltrasonic "conditioning cabinet," a refrigerator like device thatstandardizes the fabric to

1.65% relative humidity,2.20 Centigrade, with3.30 minutes of exposure to D65 daylight.


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Does this ensure consistent Textile color control

TEXTILE COLOUR MEASUREMENT IS STILL NOTSAFE_GUARDED FOR CONSISTENCY !!!!!

WHY ?TEXTILE COLOUR MEASUREMENT IS STILL NOT SAFE_GUARDEDFOR CONSISTENCY . Due to ..

Due to Inter-instrument (DIS-)Agreement laid down by unit to unitdifferences due to aging:


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Errors in spectro color measurements

. The following is an exhaustive list of the principal errors in any opticaldesign of spectrophotometer :

1. Errors in absolute scales of diffuse reflectance and 0/45 radiance factor.2. Errors due to differing properties of white reference standards.3. Non-linearity of the photodetector.4. Incorrect zero level.5. Wavelength scale error.6. Specular beam exclusion error.7. Specular beam weighting error.8. Errors due to non-uniformity of collection of integrating spheres.9. Polarisation errors in the geometry.10.Differences in methods for calculating color data from spectral data.

11.Errors due to thermochromism in samples.12.Errors due to the dependence of spectral resolution on bandwidth, scan

speed and integration time.13.Geometry difference between illumination and collection optics within

the specified limits.


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What is the Inter-Instrument agreement by definition?

The centre (master) value of inter-instrument agreement isdetermined by measuring a specific quantity of instrumentsof the first production lot.

Actually we cannot just talk of only one centre point. Forgetting more precise information about the agreementbetween multiple instruments, a set of 12 BCRA tiles is usedto establish the inter-instrument agreement.

By using master bodies, which are very close to this centrepoint, BCRA tiles are measured and the average of thismeasurement data is used as centre value for inter-instrument agreement.


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What is the declared Inter-Instrumentagreement?

DATACOLORSF 650 has a declared Inter-instrument Agreement for Reflectance

(CIELAB)0.15 (max)

(McBeth) X-Rite CE7000A has a declared Inter-instrument Agreement for Reflectance(CIELAB)0.15 (max)

Konica Minolta CM3600d similarly has a declaredInter-instrument Agreement for Reflectance(CIELAB)0.15 (max)

KONICA MINOLTA is a truly Global equivalent spectrophotometer


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The delta-E of 0.15 can occur in white tile due to inter-intrumentdifferences.

Now, in a Red shade it can be 0.5 or more !!To add to this, thermo-chromism can add another 1.2 dE.&Humidity, & ..aging, old xenons, dirty sphere !!!.....?*$#@

RESULT: Same physical sample can

stand rejected !!!!!!!!!!!!!

Suppose we use the same models across two laboratories in USA & India :


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Colour Control in supply ChainWhat is the solution ?

-0.020.10.080.05-0.01-0.07Difference of above

-0.94-3.29-3.42-0.11-1.073.59Data color

-0.92-3.39-3.5-0.16-1.063.66Konica MinoltaYellow

-0.010.010-0.01-0.04-0.03Difference of above

-0.13-0.020.12-0.030.230.26Data color

-0.12-0.030.12-0.020.270.29Konica MinoltaMara Green

-0.010.03-0.02-0.0100Difference of above

0.050.1-0.10.03-0.230.25Data color

0.060.07-0.080.04-0.230.25Konica MinoltaSilver

-0.12-0.06-0.05-0.03-0.04-0.09Difference of above

0.110.380.170.360.830.92Data color

0.230.440.220.390.871.01Konica MinoltaDark Maroon

0.05-0.060.06-0.050.030.08Difference of above

-0.16-0.310.27-0.220.150.38Data color

-0.21-0.250.21-0.170.120.3Konica MinoltaNavy Blue

DHDCDbDaDLDEName

Report-Readings at your INEOS ABS Ltd. Nandesari

Vadodara QCLAB: 19th March,2010(Dakshesh Darji & Manish Kapadia, field visit readings)


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-0.07Difference of above

3.59Data color

3.66Konica MinoltaYellow


0.26Data color

0.29Konica MinoltaMaraGreen

0Difference of above

0.25Data color

0.25Konica MinoltaSilver


0.92Data color

1.01Konica MinoltaDarkMaroon

0.08Difference of above

0.38Data color0.3Konica MinoltaNavy Blue

DESPECTROPHOTOMETERName

Though there isvast difference ininstruments, the

delta-E colordifferences alwaysagree for any given

2 instruments


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Colour Control in supply ChainWhat is the solution ?

-0.020.10.080.05-0.01-0.07Difference of above

-0.94-3.29-3.42-0.11-1.073.59Data color

-0.92-3.39-3.5-0.16-1.063.66Konica MinoltaYellow

-0.010.010-0.01-0.04-0.03Difference of above

-0.13-0.020.12-0.030.230.26Data color

-0.12-0.030.12-0.020.270.29Konica MinoltaMara Green

-0.010.03-0.02-0.0100Difference of above

0.050.1-0.10.03-0.230.25Data color

0.060.07-0.080.04-0.230.25Konica MinoltaSilver

-0.12-0.06-0.05-0.03-0.04-0.09Difference of above

0.110.380.170.360.830.92Data color

0.230.440.220.390.871.01Konica MinoltaDark Maroon

0.05-0.060.06-0.050.030.08Difference of above

-0.16-0.310.27-0.220.150.38Data color

-0.21-0.250.21-0.170.120.3Konica MinoltaNavy Blue

DHDCDbDaDLDEName

Report-Readings at your INEOS ABS Ltd. Nandesari QC LAB: 19th March,2010


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DATACOLORSF 660 (McBeth) X-Rite CE7000A Konica Minolta CM3600d

Are internally accredited for ASTM, CIE,AFNOR, DIN, ISO standards.

Konica Minolta has also been accredited forJIS (Japanese IndustryStandards) which arevery stringent.



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So, What is our buyers recommendation, really?

Inherent QUALITY or COST of produce ? Product itself, or costly equipment & process ? Timely delivery or Record of time/resources spent

on production ?

In the internet age, will buyer come again ? And again?& finally,ULTIMATELY, does he really leave a survival profit for

the Producer ?Think about it ..


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Buyer recommendation?Let the buyer recommend us quality & delivery, not

costs.Let the producer plan costs & so profits.

Let us be aware of quality, delivery & costs

Presentation ends .. &Awarness begins.Thanks,Manish Kapadia /Dakshesh Darji

buyer recommendation & supply chain

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