In the production of staple fibre- 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 labour and, especially in case of modern automatic computer-controlled testing equipment, in considerable financial investment.

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.

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 forcemeasuring 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.

In case of continuous multifi lament yarns, interlaces (entanglements), too, infl uence 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.

In this test, e.g. according to ISO 2060 or ASTM D6587, a preselected 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 specifi ed by the relevant standards are exceeded, a correction is automatically made based on the same yarns tensile properties.

Mains supply:

230 V, 50 (60) Hz, current requirement approx. 1 A

Compressed-air supply:

min. 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.