Yarn twisting process and tensioner

The invention discloses a yarn twisting process and a tensioner, and relates to the technical field of textile production, and the twisting process comprises the following steps: paying off a twisted yarn; paying off untwisted threads; the untwisted threads are combined with the twisted threads after being tensioned; the tensioner comprises a barrel, a plurality of pressure balls and a plurality of matching pieces. A cavity is formed in the cylinder body, and a wire inlet and a wire outlet are formed in the two ends of the cylinder body respectively; the matching piece is located in the cavity, and a threading hole and a movable groove are formed in the matching piece; the threading hole is communicated with the movable groove; the pressure balls are located in the movable grooves, and the pressure balls tightly press the non-twisted rollers penetrating through the corresponding threading holes to be twisted and arranged. And twisting by a twisting machine. The physical and mechanical properties of the yarn c