Rieter

Terms

Index

The fiber bundle passes through the drafting system, the yarn guide eyelet, the  balloon checking ring and the  ring traveler on the way from the roving bobbin to the  cop. These devices are arranged at different angles and distances relative to each other, which results in different angles of deflection and paths. Dimensions and guide angles, known collectively as spinning geometry, have a significant influence on the spinning process and final yarn quality, and especially on:

  • tension conditions,
  • ends down frequencies,
  • irregularity,
  • fiber integration,
  • yarn hairiness,
  • incidence of fly,
  • etc.

Spinning geometry is therefore a very important optimization criterion for machinery manufacturers. However, it has to be borne in mind here that changing a spinning geometry parameter inevitably entails a change in all other geometry parameters.
Only the three most important factors from among the numerous spinning geometry parameters are dealt with in this volume, for reasons of space (Fig. 82). Other relationships are described in  Technology of Short-staple spinning. These parameters are:

  • spinning triangle (W/WS)
  • spinning length (L1/L2)
  • spinning angle (γ)

Captions for Fig. 82:

D
Drafting system
C
Cylinder support
E
Spinning path
F
Yarn guide eyelet
B
Balloon checking ring
R
Ring rail
S
Spindle
α
Angle of drafting system relative to horizontal
β
Angle of drafting system relative to spinning path axis
γ
Angle of the thread on the spinning path relative to the vertical
δ
Angle of the leg of the thread balloon relative to the spindle axis
lB
Balloon height (variable)
IG
Distance between drafting system and thread guide eyelet (variable)
IF
Distance between thread guide eyelet and top of spindle or tube (variable)
IS
Spindle height
IK
Tube height
H
Traverse height of the ring rail (winding height)
R
Distance between ring and balloon checking ring (variable)
dH
Outside diameter of the tube at the to
V
Overhang of the top front roller relative to the bottom roller

Fig. 82 – Spinning geometry angles and dimensions