Covatest

Evenness and Imperfection Testing

Testing of evenness and imperfections is essential
for staple fibre spinning mills, since the
perceptions of such tests are used to control the
quality of the slivers, rovings, and yarns during
the complete spinning process. A spectrogram
of the mass distribution over the sample length
gives valuable information to assess the status
of the spinning-, carding-, drawing-, and combing
process, and to verify the proper function of the
production machines. Finally, the yarn hairiness
is an important parameter, e.g. to assess the
processability or the final fabric appearance.

COVATEST with Hairiness Module

Textechno’s COVATEST is a perfect testing instrument
to measure all above-mentioned parameters.
Based on the well-proved capacitive measuring
principle the mass irregularity along the sample is
analyzed, including a mass spectrogram. The
COVATEST can be equipped with an optional
Hairiness Module, which utilizes a modern optical
sensor with LASER illumination.
The tester can be used for both short- and longstaple
spun yarn and for worsted spinning yarns. For
testing the evenness of tops an additional external
sensor is available.The operation software runs under current Windows
versions like WINDOWS® XP or WINDOWS® 7.
The operation itself is extremely easy and selfexplanatory.
All data are stored in a database for
repeated evaluation and printing.
The