B 72 / B 76 RIETER UNImix homogeneous mixer – Effective mixing in a minimum of space
he B 72 / B 76 mixing machine guarantees homogeneous, intimate mixing of the bale feed in a minimum of space, even with unfavorable bale lay-down. The unique 3-point mixing process is equally suitable for cotton and man-made fibers. Eight mixing chambers ensure not only effective mixing, but also high production performance. The large storage volume of the UNImix provides the ideal preconditions for a high degree of operating autonomy in the blowroom.
- The production volume of 800 kg/h (B 72) or 1 200 kg/h (B 76) results in an excellent price/performance ratio with comparably low space requirements.
- The large storage capacity ensures regular feeding of the downstream blowroom machines and is the precondition for the production of quality yarn without personnel intervention.
- Settings are entered rapidly, easily and reproducibly on the UNImix by the push of a button.
- Short setup times result in high efficiency.
· The unique 3-point mixing principle with 8 mixing chambers roduces a good, permanently homogeneous fiber mix. This is the precondition for consistently high yarn quality.
- Tuft size can be adjusted at the mixing roller in coordination with raw material and application; optimal opening and homogeneous feed to the subsequent process are thus guaranteed.
- Integrated dust removal separates the dust-laden conveying air from the fiber material. This occurs extremely gently and consequently improves the running behavior of the spinning machine and thus also yarn quality.
- The easy addition of an opening or cleaner module provides flexibility with the capability to respond to changes in market conditions.
- The ability to process cotton, blends and man-made fibers means that there are no limitations when processing different raw materials.
- Bypass facility for the cleaner module (e.g. with man-made fibers) for rapid mix change.
The evenness of the blend must always be assessed in two directions: the longitudinal direction and the transverse direction. Where there is unevenness in the longitudinal direction, yarn portions exhibit different percentage distributions of the individual components (Fig. 32). These can lead to stripiness. Where there is unevenness in the transverse direction, the fibers are poorly distributed in the yarn section (Fig. 33). This irregularity leads to an uneven appearance of the finished product.
The determination of the evenness of a blend, e.g. of synthetic and natural fibers, is costly and not simple. One component is usually dissolved out or colored differently.
Fig. 32 – Unevenness of the blend in the longitudinal direction
Fig. 33 – Unevenness of the blend in the transverse direction
The spinner aims to distribute the different fibers evenly in the yarn. For this purpose, he must firstly produce a good blend at some stage of the process, and secondly be able to maintain the blend up to the stage of binding into the yarn. It is a well-known fact that meeting the first of these requirements is not always easy; sometimes the second is harder still. Fibers of different length, surface structure, crimp, etc., also behave differently during movements as individuals. A “de-blending” effect can very often arise. During rolling of fibers in hoppers (bale openers, hopper feeders), migration of the components occurs where the fibers have different structures (e.g. cotton and man-made fibers). A similar effect is found during drawing in drafting arrangements. Fibers with large differences in length or surface form (smooth/rough, dyed/undyed, etc.) do not exhibit the same cohesive contact with each other.
When a drafting force is applied, they move differently – this leads to clumping of fibers into clusters and finally to de-blending. Pneumatic transport can also cause de-blending.
Blending/MIXING is carried out in three stages
- metering, determination, and precise establishment of the quantities of the individual components;
- mixing, i.e. bringing together the metered quantities;
- intermingling, i.e. distributing the components evenly in the body of fibers.
Each stage is as important as the other. However, difficulties arise primarily in intermingling and in maintaining the blend once it has been achieved. The latter is very difficult with fibers of different surface structure and varying energyabsorbing capacity on stretching, because de-blending tends to occur at various processing stages.
Caused this process using a modern tools, chance to make mistake is low. It can be happened usually caused by wrong calculated the compositions of fiber. So that the mixing fiber will be bad fiber.
- mixing machine guarantees homogens fiber
· in this machines we can use The unique 3-point mixing principle with 8 mixing chambers roduces a good, permanently homogeneous fiber mix. This is the precondition for consistently high yarn quality.
· Calculate the composition fiber with effective, well, and right cause this wii be fiber that we want.