staple length comparision

COTTON STRENGTHPREDICTION

J. Militk, D. Kemenkov, G. Krupincov, J. Ripka

The Technical University of Liberec

Liberec, Czech RepublicTHESALONIKI 2004

OUTLINE

Cotton fibers quality characteristics Introduction of geometric characteristics index

of cotton fibers Inter-relations between cotton fiber properties

and bundle strength. Dependencies between cotton strength results

from various devices.

Strength PredictionProblems

Lack of theories or models Measurements of fiber properties (LVI, HVI).

Direct vs. indirect principles (fineness) Measurements of fiber strength (Pressley,

Stelometer, Fibrodyn, Mathis, HVI)Single, bundle, test length, calibration

Mutual interrelations (fineness, length, strength) Variability of fiber properties (small range,

dependence on maturity etc.)

Uster HVI spectrum

Uster AFIS

Cotton fiber geometry

Premium Range 3.7-4.2Base Range 3.5-3.6 or 4.3-4.9Discount Range 3.4 and below or 5.0 and up

Micronaire Reading and Market Value

UHM [mm] UI [%]

MIC [-]

FI [tex]

SF [%]

MAT [-]

Geometric properties index

Korickij higher index higher quality multiplicative factors

LVI measurements mean lengthIG = 0.1*Lm*(1-SF/100)*MAT*(FI)-0.5

HVI measurements

MICSFUIUHMIGa

*10000)100(** =

FIMATSFUIUHMIG

*1000000*)100(** =

3 3.2 3.4 3.6 3.8 4 4.2 4.4 4.6 4.8 50.13

0.14

0.15

0.16

0.17

0.18

0.19

0.2

0.21

0.22regres s ion model

FJ = 0.038*MAT + 0.016Me an re lative e rror: 5.63039

Cotton fiber strength

STR [cN/tex]EL [%] elongation ant break

Time trends in Cotton Quality

Texas cottons 1990 -I

-10 -5 0 5 10 15-20

-15

-10

-5

0

5

10

15

20

1

2

34

5

6

7

8 9

10

11

1213

14

15

1

2

3

4

56

s econd component

f

i

r

s

t

c

o

m

p

o

n

e

n

t

combined graph

15 TEXAS cottons (1990 crop)

1 2 3 4 5 60

10

20

30

40

50

60

c

o

n

t

r

i

b

u

t

i

o

n

[

%

]

component No

Contribution of variables

1.UHM,2. UI,3. SF, 4. MAT,5. FI,6. MIC7. STR

UHM 0.0060 0.0008 UI 1.6499 0.6472 SF 46.575 27.793 MAT 51.751 26.443 FI .0001 0.0000 MIC 0.0172 0.0262

Principal components

Texas cottons 1990 -II


Principal components1 2 3 4 5 6

0

10

20

30

40

50

60

component No

v

a

r

i

a

n

c

e

d

r

o

p

[

%

]

Component s election

% of Variance58.835939.45291.57430.13520.00170.0000

Texas cottons 1990 - III

x

1

x

2

x

3

x

4

x

5

x

6

x

7

x1 x2 x3 x4 x5 x6 x7


Scatter graphs

Texas cottons 1990 - IV


1

2

3

4

5

6

7

S cale Gives Value of abs (R) for Each Variable P air

Correlation Map

1 2 3 4 5 6 7

0.1

0.2

0.3

0.4

0.5

0.6

0.7

0.8

0.9

Pairedcorrelations

Simple predictions

79 79.5 80 80.5 81 81.5 82 82.5 83 83.5 8420

22

24

26

28

30

32regres s ion model

HVIS TR = 0.87*UI - 42Me an re lative e rror: 7.2 %

70 72 74 76 78 80 82 84 8620

22

24

26

28

30

32regres s ion model

HVISTR= 0.26*MAT + 6.9Me an re lative e rror: 7.7 %

20 22 24 26 28 30 3224

25

26

27

28

29

30

31

y meas

y

p

r

e

d

y = 0.35*x + 18HVIS TR = -45 + 0,68*UI + 0,23*MATMe an re lative e rror: 7.08 %

Comparison of US cottons strength

Comparison ofSTELOMETER, HVI andSPINLAB strength for 15TEXAS cottons (1990 crop)

Prediction of strength I

STELOMETER strength prediction

SF,UHM, UI,MIC,FI,MAT

Prediction of strength II

HVI strength prediction

SF,UHM, UI,MIC,FI,MAT

Strength comparison

The main problems in strength comparison based on various devices are:

differences in gauge length (strength is decreasing function of gauge length),

differences in various methods for fibres fineness evaluation, differences in strength measuring principles.

It is therefore no possible to obtain directly comparable results and regression lines are some kind of calibration equation serving for re-computation purposes mainly.

COTTON STRENGTH PREDICTIONOUTLINEStrength Prediction ProblemsUster HVI spectrumUster AFISCotton fiber geometryGeometric properties indexCotton fiber strengthTime trends in Cotton QualityTexas cottons 1990 -ITexas cottons 1990 -IITexas cottons 1990 - IIITexas cottons 1990 - IVSimple predictionsComparison of US cottons strength Prediction of strength IPrediction of strength IIStrength comparison

staple length comparision

Documents