Rieter

Interaction of feed assembly, opening element and grid

Index

Fig. 29 to Fig. 32 demonstrate the influence of adjustments to these elements:

  • Fig. 29, distance between feeding device and beater;
  • Fig. 30, grid gap width;
  • Fig. 31, beater speed 740 rpm (and setting angle of the grid bars);
  • Fig. 32, beater speed 550 rpm.

The figures do not show fiber deterioration, or even damage, that can be caused. Nevertheless, very fine settings and high rotation speeds can produce very negative effects. On the other hand, the number of neps is scarcely affected. The design of the machine and its components exerts the strongest influence on neppiness.

Fig. 29 – Influence of feed pedal distance (Δs; B, mm) on waste elimination (A, %)

Fig. 30 – Dependence of waste elimination: (A, %) on the width of the grid gaps (B) (1 closed, 4 open). a = proportion of good fibers; b = trash content.

Fig. 31 – Dependence of waste elimination: (A, %) on the setting angle of the grid bars relative to the beater (B in degrees). I, fiber content; II, trash content; III, filter drum loss. (Beater rotation speed: 740 rpm.) Fig. 32 – The same function as Fig. 31 but with a beater rotation rate of 550 rpm.