False Twist Texturing Machine, False Twist Texturing Principle

False twist texturing machine for the texturing of synthetic threads in one handling position at a time, in which a heating device and a false twist unit are disposed within a false twist zone. In an after-treatment zone are disposed a second heating device and a counter-twist apparatus. 

False Twist Texturing Principle

False-twisting is one popular texturizing process. In this technique, twist is inserted into a heated multifilament yarn running at high speed. The yarn is cooled in a highly twisted state, so that the twist geometry is set, and then the yarn is untwisted. Untwisting leaves filaments that are still highly convoluted, allowing the production of a textured yarn of much greater volume than the yarn would be in an untextured state.

False-twist texture is usually combined with drawing. Partially oriented (POY) nylon and polyester, which have been spun at extremely high rates and are already partially crystalline, are both drawn and textured in this way.

Think about holding a rubber band between two clamps and twist this band by turning it in the center. You will observe real twist on the left as well as on the right hand side. But each side is twisted into the opposite direction. One side is S-, the other side is Z-twisted. The number of twists on the right side equals the number of twists on the left side. As you release the twisting point, all the twist will disappear. You actually had created, what we call a 'false twist'. All modern texturing machines operate according to the false twist principle.