Testing evenness and detecting imperfections are essential for staple fibre spinning mills. These tests help control the quality of slivers, rovings, and yarns throughout the spinning process. Spectrogram analysis of mass distribution along the sample length provides important information. All this data helps optimize carding, drawing, combing, and spinning steps.

Textechno’s innovative one-slot capacitive sensor allows fast measurement of these parameters in yarns. It supports high testing speeds while capturing detailed quality data.

In combination with the yarn Hairiness module (including total hairiness, yarn diameter, and hair length classification) COVAMAT S and COVATEST+ are perfect instruments for effective quality control and quality assurance. The instruments are designed to perform yarn evenness and hairiness tests according to all accepted standards, e.g. ASTM D1425/D1425M-14, ASTM D5647 and ISO 16549.

As another outstanding feature, the testing of yarns can be carried out simultaneously to the evenness testing of slivers and rovings which are measured in a separate testing zone (COVASLIVE module, left side of the instrument).

The fully automatic model COVAMAT S is equipped with a 24-position package changer. The semi-automatic model COVATEST+ is available as a price-sensitive alternative without package changer and threading arm if no automation is required.