Agriculture Reference
In-Depth Information
Table 10.2.
Qualitative evaluation of testing methods for measuring physical and mechanical fibre properties.
Fibre
property
Equipment
(method)
Equipment
cost
a
Measurement
cost
a
Usual
method?
a
Suitable
for
b
Remarks
Strength and
Young's
modulus
Tensile tester
(single-element
test)
-
++
NF
Stelometer
(collective test)
No extension/
force diagram
No Young's
modulus
+
++
+
Co, Wo, B
Diastron,
Textechno
Favimat (single-
element test)
-
-
F
HVI (collective
test)
Developed for
Co, not
adequate
for B
-
++
+
Co
Fineness
Scanner/
FIBRESHAPE
(single-element
test)
Quick analysis,
not yet
widespread
++
+
-
NF
Laboratory
balance
(collective test)
High time
demand
++
-
++
NF
OFDA/Laserscan
(single-element
test)
Quick
analysis, well
reproducible.
Problems with
thick fibres/
bundles
-
+
Wo (B)
Airflow
Indirect
measurement
(results not
fully
comparable)
+
++
+
NF
Length
ALMETER
(collective test)
Maximum length:
250 mm
-
++
-
Co, Wo, (B)
Tweezers, scale
(single-element
test)
Extremely high
time demand
++
-
+
NF
Imaging system,
software
(single-element
test)
High time
demand, not
yet fully
automatic
-
-
NF
Notes
:
a
Evaluation scheme (-, -,
, +, ++);
b
abbreviations: Co = cotton fi bres; B = bast fi bre bundles;
Wo = wool fi bres; NF = all kinds of natural fi bres.
Fibreshape
has been developed for the quality
control of fibre particle mixtures and the nee-
dle density of felts. It determines width distri-
bution and the orientation of fibres (Müssig
and Schmid, 2004).
Measurement of the width distribution of
the fibres and fibre bundles is done by preparing
the elements between two glass slides for col-
our positives (Company Gepe, Zug, Switzerland,
type 69 01) after 24 h conditioning at 20°C
