Yarn evenness (mass deviation)
Yarn evenness explained The yarn evenness of a multifilament yarn can be measured with our Zellweger Üster tester 4 system. Typically, 1000 metres of yarn is used to determine mass deviations along the yarn and is graphically represented in a mass diagram. By using a fourier transformation on the mass diagram periodicities can be observed, […]
Twist counter
Twist counter explained Twists are applied in multifilament yarns to add strength to the yarn, There is an optimum in the amount of twists per meter. This optimum is dependant on the polymer type and the diameter of the yarn. The amount of twists (in S and Z direction) can be determined in a single […]
Shrink force, (R)HASF
Shrink force, (R)HASF explained The shrink force of yarns can be measured according to ASTM D 5591-02. Within this test methode the force needed for a specific yarn shrinkage is measured over time. All measurements are standard done at 4 specimen (n=4) and average values are reported.
Hot water shrinkage (HWS)
Hot water shrinkage (HWS) explained The hot water shrinkage test can be done at 90°C and 100 °C of yarns according to BISFA 2004 Ch 11 or ASTM D 4974-022. A normal procedure for PET yarns is 30 minutes at 90°C or 100°C. Usually, the average of four measurement samples are reported. Of course measurements can […]
Hot air shrinkage (HAS)
Hot air shrinkage (HAS) and Cords explained The hot air shrinkage (shrinkage under a defined yarn tension and temperature) can be measured of yarns and cords according to BISFA 2004 Ch 11 or ASTM D 4974-022. A normal procedure for PET yarns is 2 minutes at 177 °C with a yarn tension of xxx mN/tex. […]
Linear density
Linear density explained We can measure the linear density (expressed in the unit dtex) from yarn and cord sample ranging from 10 cm to several 100 meters with predefined yarn tensions. All measurements are standard done at 3 specimen (n=3) and average values are reported. Measurements according to BISFA ch 6 are possible.
Shrinkage hot air (SHA), free shrinkage
Shrinkage hot air, free shrinkage explained The free shrinkage (without any yarn tension) can be measured of yarns and cords according to BISFA 2004 Ch 10.4 or ASTM D 2259-02. A normal procedure for PET yarns is 15 minutes at 190 °C. All measurements are standard done at 3 specimen (n=3) and average values are […]
Filament Count and cross section analyses
Filament Count and cross section analyses explained The amount of filaments in a multifilament yarn can be counted by means of light microscope imaging. Next to the amount of filaments the cross-sections shape of filaments can be visualized and cross section diameter distributions can be determined.
Mechanical properties of polymer yarns and filaments
Mechanical properties of polymer yarns and filaments explained With the Instron 5564 tensile tester we’re able to test the mechanical properties of yarns and cords according to ASTM D-885 and BISFA 2004 ch 7 or on customer defined specifications. All measurements are standard done at 5 specimen (n=5) and average values are reported. Next to […]
