Staple Length Comparision
Post on 01-Oct-2015
235 Views
Preview:
DESCRIPTION
Transcript
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
1.UHM,2. UI,3. SF, 4. MAT,5. FI,6. MIC7. STR
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
1.UHM,2. UI,3. SF, 4. MAT,5. FI,6. MIC7. STR
Scatter graphs
Texas cottons 1990 - IV
1.UHM,2. UI,3. SF, 4. MAT,5. FI,6. MIC7. STR
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
top related