montpellier 23 juin - 4 juillet 2008 gourlot j.-p. · kf h g b a i c d e cotton types 0.40 0.60...

International standardizationNormalisation internationale

Montpellier 23 juin - 4 juillet 2008

Gourlot J.-P.

Plan of presentationPlan de présentation

• Introduction• Existing standards• Calibration• Drift and use• Working groups

• Introduction• Standards existants• Etalonnage• Dérive et utilisation• Groupes de travail

Normalization stepsEtape de normalisation

1940-1950International Calibration

Cotton Standards (ICCS) ;Research + Transactions.

1986HVI Calibration Cotton ;

Transactions, USA.1995/1998

- ICCS restricted for research ;

- HVI Calibration Cotton Transactions, world.

Based on so-call ’reference methods’

Time

1923Universal Standards :

Grade, Pulling ;Transactions .

Confidence interval

IM (+/-) 0.1 unitLength (+/-) 0.02 inch

(+/-) 0.51 mmLength uniformity (+/-) 1.5 %Strength (+/-) 1.5 cN/texRd % (+/-) 1 %+b (+/-) 0.5Trash (+/-) 0.1 %

From Sasser, 1992.

Expected precision for the marketPrécision attendue sur le marché

Reference cotton use in the world: 1991Utilisation de cotons de référence : 1991

Who No HVI Consumption

HVICC Ratio ICCS Ratiokg kg/HVI kg kg/HVI

USDA 212 19214 91 3023 14.2

USA except USDA 91 828 9 49 0.5

OutsideUSA 318 192 0.6 1.8 0.004

Total 621

Reference cotton use in the world: 1994Utilisation de cotons de référence : 1994

Who No HVI Consumption

HVICC Ratio ICCS Ratiokg kg/HVI kg kg/HVI

USDA x 14145 ? 6803 ?-21% +125%

USA except USDA x 766 ? 127 ?

- 7% +159%OutsideUSA x 245 ? 42 ?

+27% +2200%Total 883

+42%

ICCS ICCS Mike only HVICC

* Stelometer HVI HVI

* Carded cotton Raw cotton Raw cotton

* 3 types 6 types 2* 2 types

* Measurement ofT1 Mike Length (UHM)E1 UI%

(1 type with SL%) Strength

Existing reference cottons after 1998Cotons de référence existants après 1998

ICCS Mike only standards

6 - International normalisationof the measurements

2.8

3.74.2

4.65.2

5.6

2.5

3.43.7

4.44.8

5.3

Gm Cm Dm Bm Im AmCotton types

1.0

2.0

3.0

4.0

5.0

6.0

7.0Mike

Strength Histogram2356 Cottons from different origins

15 19 23 27 31 35 39 43Strength in g/tex

0

10

20

30

40Percentage %

St Maxi HVICC/St Mini HVICC Tested cottons

Length of ICCS standards

6 - International normalisationof the measurements

0.700.80

1.00 1.05 1.10 1.10 1.10

1.251.35 1.40

0.60 0.60

0.90 0.90 0.881.00 1.00

1.151.25 1.20

K F H G B A I C D ECotton types

0.40

0.60

0.80

1.00

1.20

1.40

1.60Inches

Upper Half Mean Length Histogram2356 Cottons from different origins

20 25 30 35 40Upper Half Mean Length in mm

0

5

10

15

20

25

30

35Percentage %

Length Maxi HVICC/Length Mini HVICC Tested cottons

Existing reference cottons after 1998Cotons de référence existants après 1998

‘HVI’ modules calibration: IMEtalonnage d’une CMI : IM

2.5

3

3.5

4

4.5

5

5.5

2.5 3 3.5 4 4.5 5 5.5

Theorical values

Obs

erve

d va

lues

Theo.Obs.

Calibration = change slopeand offsetbetweenobserved vs theorical values

About reference values establishementA propos de la création de standards

Question : is there any drift in the establishment of Calibration Cotton reference data ?

• A set of calibration cotton = at least 2 cottons• These can also be analyzed as samplesCalibration Samples Issue/DateSet 1 Set 1, 2, 3, … 1Set 2 Set 1, 2, 3, … 2Set 3 Set 1, 2, 3, … 3

About reference values establishementA propos de la création de standards

Question : is there any drift in the establishment of Calibration Cotton reference data ?

• A set of calibration cotton = at least 2 cottons• These can also be analyzed as samplesCalibration Samples Issue/DateSet 1 Set 1, 2, 3, … 1Set 2 Set 1, 2, 3, … 2Set 3 Set 1, 2, 3, … 3

Comparison between results => drift ?

Preliminary experimentExpérience préliminaire

98

100

102

104

106

108

110

112

1981 1983 1985 1987 1989 1991 1993 1995 1997

ICCSHVICC(1)HVICC(2)

Slope 0.11 cN/tex / year



Drift and other troublesDérive et autres problèmes

• Observed Drift

0

20

40

60

80

100

kg

HVICC ICCS

Consumption in 1991

USDA USA (not USDA) Other


• Observed Drift

+ Delay to access to recent generations of referencecottons

=> Differential in reading levels


• Observed Drift





Relations between yarnversus fiberquality

20 25 30 35 40 45 50

HVI strength (cN/tex)

100

300

500

700

900

Breaking force (cN)RS 20 tex r = 0,96OE 20 tex r = 0,96RS 27 tex r = 0,97OE 27 tex r = 0,98RS 37 tex r = 0,97OE 37 tex r = 0,98


• Observed Drift




=> Differential in reading levels=> Lower accuracy in the yarn quality predictionfrom fiber quality measurement


• Observed Drift


=> Differential in reading levels=> Lower accuracy in the yarn quality predictionfrom fiber quality measurement


• Observed Drift

=> Use / consume reference materials !!!!

Working groupsGroupes de travail

• CSITC• International Textile

Manufacturers Federation WG– Spinning Committee– Length– ‘HVI’– Dust and trash– Fineness and maturity– Color– Stickiness

• Normalization

• CSITC• International Textile

Manufacturers Federation WG– Filature– Longueur– ‘HVI’– Poussière et déchets– Finesse et maturité– Couleur– Collage

• Normalisation

montpellier 23 juin - 4 juillet 2008 gourlot j.-p. · kf h g b a i c d e cotton types 0.40 0.60...

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