Rieter

General considerations regarding opening and cleaning

Index

The  degree of cleaning cannot be better than the  degree of opening. Accordingly, the following should be noted:

  • Dirt can be removed practically only from surfaces.
  • New surfaces must therefore be created continuously.
  • The form of the opening machine must therefore be adapted to the degree of opening already achieved.
  • The Type and degree of openingopening devices should become continually finer, i.e. within the blowroom line, a specific machine is required at each position.
  • The degree of cleaning is linearly dependent upon the degree of opening.
  • Newly exposed surfaces should as far as possible be cleaned immediately.
  • This means that each opening step should be followed immediately by a cleaning step without intervening transport, during which the surfaces would be covered up again and would require re-exposure.
  • Ideally the opening and cleaning machines should form a unit.
  • A high degree of opening in the blowroom facilitates cleaning in the carding room.
  • A high degree of opening out in the blowroom reduces shortening of staple at the cards.
  • Opening and cleaning of cotton on only one (universal) opening machine is very difficult owing to the requirement for continual improvement of the degree of opening.
  • On the other hand, each machine in the line represents often considerable stress on the fibers.
  • Aside from economy, therefore, quality considerations indicate the smallest possible number of machine passages in the blowroom.
  • Feeding of flocks in a clamped condition gives an intensive but usually not very gentle opening action.
  • Feeding in a loose condition gives gentle, but not very intensive opening.
  • Opened flocks should approach as closely as possible a spherical shape. Long narrow flocks lead to entanglements during rolling movements and pneumatic transport. Finally, they form neps.
  • Narrow setting of the feed device relative to the roller increases the degree of opening, but also the stress on the material.