capstan 10 the tape 6 passing approximately 90 u00b0 around the capstan during this movement around the capstan 10 the tape 6 converges with a nylon core 11 at a point 12 on a cylindrical surface of the capstan the nylon core passes under very low tension through a ceramic eyelet 13 at the point 12 the tape 6 begins to wrap helically around the nylon core 11 and wrapping is complete at point 14 at an edge of a cylindrical land 28 of the capstan 10 as will be described later the bi component yarn 15 consisting of the tape helically wrapped around the core then follows a vertical downward path through a pigtail 31 which is axially situated above spindle 17 through the traveller 19 which moves on the ring 18 around the spindle 17 and finally is wound on to a package 20 to form package 21 26 is the balloon normally formed and 27 the antiballooning ring the force for wrapping is created by the torque generated in the yarn 15 by rotation of the spindle 17 and the traveller 19 the helix angle of wrapping is given by u03b8 the wrapping capstan 10 is inclined at an angle u03b1 to the horizontal with its top to the right when as shown in fig1 the spindle traveller combination is set for inserting s twist the point 14 where the wrapping is complete is in line with the centre of the pigtail 31 and the axis of the spindle 17 now refer to fig2 a which is a front elevation of the wrapping capstan 10 inclined for the s twist condition referred to in the above paragraph fig2 b is a front elevation of the wrapping capstan 10 but inclined top to the.