Variable twist level yarn using fluid twisting

A system comprising:

• a supply of yarn strands;
• at least one fluid jet device adapted to impose a twisting torque on individual yarn strands;
• a rotatable feed roll adapted to feed the yarn strands at a predetermined speed of travel between the supply of yarn strands, the at least one fluid jet device and a package of the finished twisted yarn product;
• and
• a control device that selectively rotates the rotatable feed roll at selected speeds and operates the at least one fluid jet device in accordance with desired control parameters such as pressure and flow rate for a selected first time period to provide at least one of a first twist level and a first twist direction of the yarn strands for a first length of the finished twisted yarn product, and that selectively rotates the rotatable feed roll at selected speeds and operates the at least one fluid jet device in accordance with desired control parameters such as pressure and flow rate for a selected second time period to provide at least one of a second twist level and a second twist direction of the yarn strands for a second length of the finished twisted yarn product.

A device for twisting at least two yarn strands together into a finished twisted yarn having a twist level varied along its length in accordance with a pattern, comprising:

• at least one fluid jet device having fluid jets positioned in relationship to individual strands of yarn and adapted to impose selected twisted torques on the strands of yarn, the fluid jet device further comprising a controllable fluid blast adapted to reverse the twist imposed on the strands of yarn by the fluid jets in selected zones along the length of entwined strands of yarn;
• a rotatable feed roll adapted to feed yarn strands at a predetermined speed of travel between a supply of yarn strands, the at least one fluid jet device and a package of the finished twisted yarn product;
• a drive means for selectively rotating the rotatable feed roll at selected speeds for a selected time period;
• a control means for selectively moving the controllable fluid blast at selected speeds relative to the speed of travel of the yarn strands;
• and
• a programmable controller for selectively varying the speeds and time periods in accordance with the pattern.