Automatic tensile tests on yarns with high linear density and breaking strength demand special requirements regarding clamps, measuring system, sample waste disposal, and mechanical stability of the testing equipment. This particularly applies to technical yarns comprising high-tenacity polymers such as Aramid or UHMWPE. Here force-measurement limits of 1000 N and mechanical stress limitations for such test equipment are
insufficient in most cases. In addition, the clamps of the automatic tensile testing equipment are often inadequate for withstanding breaking forces of this
magnitude.

Moreover, for untwisted technical fi lament yarns, there is a demand to insert a certain amount of twist into the yarn prior to the tensile test. Compared with tests carried out on untwisted yarns, this method has the following advantages:

• Better definition of the test and lower deviations for breaking-force, elongation at break and work to rupture: During the testing of an untwisted multi-filament yarn, usually filament breaks occur one after another, whereas a twisted multi-filament yarn will break suddenly.
• Close-to-practice tests: For most technical yarn applications, the yarn is twisted before being processed and subjected to use in its application.
• Standardized test method: Various standards recommend or require tensile tests on technical yarns to be carried out after twist insertion. ASTM D 885, Note 9, ASTM D 2256, BISFA standards for Polyester- and Polyamide filament yarns, ISO 2062.
• Possibility for twist optimisation: Material properties which can be measured with the equipment can be examined regarding the influence of twist. Such as tenacity and elongation, work to rupture, modulus, and reference values for force and elongation . This enables determination of the optimum twist level for respective applications.

Textechno also offers a range of other STATIMAT devices. STATIMAT DS, STATIMAT ME+ and STATIMAT MEL+.