The new Rieter blowroom

Seen from a business perspective, the blowroom - apart from the loss of raw material that occurs there - is not a relevant factor in the context of the process costs of the spinning mill as a whole. However, its qualitative influence on the end product is considerable. Fiber length, fiber strength and nep count in particular can deteriorate significantly in a second-rate blowroom, and this would also have an adverse impact on yarn properties.
Innovation in the blowroom
In the past 40 years the number of cleaning stages has been drastically reduced from the original 6 to 2. At the same time line production rates in pre-cleaning and fine cleaning operations have doubled and tripled. In the context of these mutually contradictory trends the required production in the fine cleaner now proves to be critical. The solution to this problem is CLEANfeed (Fig. 1), i.e. the fine cleaning stage is now transferred to the C 60 card chute. “Critical” fine cleaning is thus divided among several systems, i.e. reduced to the production
level of the card.
In the case of a coarse yarn for rotor spinning, maximum production is thus currently 220 kg/h. On the other hand, very finecombed yarns for ring spinning are processed at around 40 kg/h. Fine cleaning is thus adapted automatically via card output to the quality requirements of the end product. Two
variables are responsible for gentle treatment of the raw material from the system standpoint. The increased working width and the low output of CLEANfeed in terms of kg/h.
Effect of CLEAN-line on yarn quality
Studies have shown that these two technological variables directly influence fiber quality and ultimately yarn quality. Fig. 2 shows the effect on neps. In a direct comparison between a
conventional blowroom
and CLEAN-line, nep counts improve by some 10 - 30%, depending on the application. Short fiber content is reduced by some 2.5%, as shown in Fig. 3. This is not only a qualitative advantage that is reflected

in imperfections and yarn clearer cuts, it also has an economic impact. The 2.5% reduction in short fiber content also directly affects waste, content (noils) in the combing room.

CLEAN-line - the blowroom system
The quality benefit in the yarn has a technological basis consisting of many detailed features of the CLEAN-line blowroom system (Fig. 4). The elements for success are:
· Microtufts at the very beginning of the process. UNIfloc guarantees gentle opening of the cotton bales with its fine-toothed take­off roller and fine grid. This creates large surfaces, from which trash can then efficiently be removed. The small tufts also provide the basis for homogeneous, intimate blending.

· The gentle yet efficient cleaning of this tuft surface in the unclamped state in UNIclean.
This ensures that large trash particles are removed at this point. We therefore remain true to our 2-stage cleaning philosophy. With only one cleaning stage, coarse trash losses of good fibers can be particles are shattered.
These particles are then very difficult to eliminate in subsequent processes.
· The VARIOset device in UNIclean and CLEANfeed guarantees quality, flexibility and economy at the highest level. Trash removal and adjusted selectively at the push of a button.
· The unique 3-point blending process in UNImix ensures very intensive blowroom blending and thus uniform quality of the yarn. This is more important than ever
nowadays as processes become shorter and doubling numbers are reduced.
· The fine cleaning stage comprimising several
CLEANfeed units.
The raw material is
thus gently cleaned and dedusted.
The CLEAN-line technology package gives the assurance of having done the best job possible for years to come, in terms of both quality and economy.