OEKO-TEX Article Numbers Covering One Construction and Not Its Sister
An OEKO-TEX certificate scope covers only explicitly listed article descriptions, leaving chemically modified sister constructions uncertified without separate testing.
Product Class II
Harmonic Tension
Yarn stretch characteristics govern the processing stability of filament categories during high speed warping operations. Mechanical stress applied along the creel during package withdrawal demands strict monitoring to prevent permanent deformation in elastomeric filaments. Tension peaks arising from uncoordinated guide eye friction generate spool irregularities that appear later as dyeing streaks in finished piece goods.
High denier variations force operators to adjust the delivery speed until the tension profile matches standard limits.
Elastic Recovery
Filament resilience depends on molecular orientation achieved through controlled drawing stages inside the extrusion plant. Polymer chains return toward their initial state after tension release, provided the deformation remains below the yield point of the raw material. Excessive elongation during sizing breaks individual filaments and produces hairy surfaces on the woven fabric.
Laboratory dynamometers measure elongation properties by stretching standard skeins until rupture occurs.
Creel Alignment
Bobbin placement angles dictate the uniformity of delivery tension across all ends running into the beaming machine. Misaligned guides introduce localized friction points that alter the final package density without warning. Operators check ceramic eyelets daily for grooving caused by abrasive titanium dioxide delustrants present in synthetic yarns.
Proper alignment eliminates erratic tension spikes that cause broken filaments during subsequent processing.
Denier Control
Linear mass density calculations determine the correct spacing of threads across the reed during preliminary warping procedures. Mass variations along the filament length stem from inconsistent metering pump speeds during the polymer melt spinning phase. Gravimetric testing of conditioned skeins reveals whether the yarn batch complies with purchasing specifications.
Heavy sections create excessive torque on the winding package, resulting in unstable bobbins that collapse during transit.