Automatic tensile, evenness and count tester.
Tasks of the quality control on yarns
and threads
STATIMAT DS
Tensile test
Yarn evenness and count test
In the production of staple fiber- or filament yarns
as well as in twisting or texturizing operations
quality control serves to secure material properties
which ensure trouble-free downstream processing as
well as flawless final products. On the other hand,
by routine testing of yarns it is possible to
recognize faults in the production process early
enough to analyze the causes of such defects and to
take corrective actions.
The most important properties of yarns are tensile
strength and elongation, mass unevenness, and yarn
count (linear density). Static tensile tests, yarn
evenness tests, as well as various methods of yarn
count testing, e.g. by means of wrap reel and
balance, serve for the assessment of these yarn
properties. The operation of different test
equipment to which the yarn samples are presented
one after another, results in high expenditure of
labor and, especially in case of modern automatic
computer-controlled testing equipment, in
considerable financial investment.
STATIMAT DS
This new model of the well-proven STATIMAT series of
Textechno combines testing of tensile properties
according to the CRE principle, unevenness, and
count of yarn and thread in one tester. The
essential advantage of such a combination of
different test methods lies in the common use of
peripheral components like package changer,
threading mechanism for inserting the yarn sample
into the test sections, yarn feeding device, waste
yarn disposal, instrument housing with protective
front panel, as well as control electronics
including the PC-based Textechno TESTCONTROL system.
The three tests on each package presented by the
package changer are performed in succession.
Optionally it is possible to test unevenness and
yarn count in one test run.
Test methods
Tensile test
The essential features of this STATIMAT DS test
procedure are the high clamping force of the
pneumatic jaws for tensile tests up to 1000 N, the
long path of the draw-off clamp for breaking
extensions up to 1000 %, the quick yarn threading
reducing idle time to only a few seconds, the force
measuring system with a range of 500 N (optional
1500 N), as well as high variability of the test
process and the evaluation of the measured data. In
addition to the static tensile test, for instance
according to ISO 2062 or ASTM D2256, D885,
alternating load tests (hysteresis tests) are
possible according to freely selectable programs, as
well as creep and relaxation tests. A yarn feeding
device enables high-speed take-off of selected yarn
lengths prior to starting the tensile test on a new
package or between individual tensile tests. This
means that tensile tests can be carried out on yarn
lengths both from the package outer and inner
layers.
Beside the standard automatic yarn clamps, various
special clamps for manual introduction of the test
sample are available. These enable tensile- and
elasticity tests on fabrics and cohesion tests on
slivers or rovings.
Yarn evenness test
A new innovative capacitor system
enables capacitive testing of the mass unevenness
according to ISO 16549 within a wide yarn count range by
individual adaptation of the measuring sensor to the
properties of the yarn material. As a new feature in
yarn evenness testing the yarn tension can be monitored
in order to ensure proper testing conditions. Measurable
variables delivered by the system are the coefficient of
variation of the mass distribution along the yarn
length, the spectrogram, and for staple fiber spun yarns
the numbers of neps, thick and thin places.
In case of continuous multifilament yarns,
interlaces (entanglements), too, influence the
uniformity of the yarn. A sophisticated optical
sensor system serves for measuring the number as
well as the regularity of interlaces both in fl at
and textured yarns.
Yarn count test
In this test, e.g. according to ISO 2060 or ASTM
D6587, a pre-selected yarn length, e.g. 100 m, is
delivered by the yarn feeding device into a
collection chamber, and subsequently the weight is
measured. By using the principle of a vacuum
conveyer the yarn is permanently in contact with the
ambient (laboratory) climate. In this way drying of
the yarn as would occur with a compressed-air system
does not happen.
Another advantage is the yarn tension measurement
during the test. If tension limits specified by the
relevant standards are exceeded, a correction is
automatically made based on the same yarns tensile
properties.
Technical data
Tensile test:
- 2 pneumatic yarn clamps, automatic threading
by rotating gripper arm, min. gauge length 80
mm, max. travel of draw-off clamp 1000 mm for
100 mm gauge length, draw-off speed 1...10.000
mm/min;
- Force-measuring device with a measuring
range of 500 N (optional: 1500 N);
- Elongation-measuring device with resolver,
resolution 2 µm.
Yarn evenness test:
- Capacitive measuring system, yarn count
measuring range 5...150 tex, max. test speed 500
m/min with yarn feeding device;
- Optical sensor for interlace tests in
multifilament yarns.
Yarn count test:
- Yarn collection chamber and electronic
balance, weighing range 300 g, resolution 1 mg
(higher resolution on request), yarn length
selectable in the range 1...1000 m, max. test
speed 500 m/min with yarn feeding device.
Package changer:
- Standard version with 20 positions,
expandable to 40 positions, free selection of
package changer positions to be tested in
succession.
Yarn feeding device:
- Nip roller/apron system, max. yarn delivery
speed 500 m/min, resolution of length
measurement 0.3 mm.
Further technical data
Mains supply:
230 V, 50 (60) Hz, current requirement approx. 1
A
Compressed-air supply:
6 bar, 60 l/min (with yarn feeding device/AUTOCOUNT:
150 l/min)
Lacquer finish:
RAL 9006/5002
Dimensions:
Height 1680 mm, width 825 mm, depth 830 mm,
weight approx. 250 kg
The above technical contents can be subject to
changes by Textechno.
|
Measured Solutions, Inc.
