To meet the increasing demand on recycled cotton yarns, Luannan Deshun Spinning Mill expanded the existing mill set-up of about 5-6 tons/day. For this reason, Luannan Deshun Spinning Mill, Tangshan City/China, was looking for an efficient rotor spinning machine that could handle the challenges of recycled raw materials.
The processing of recycled cotton tends to cause higher numbers of ends down. The unstable quality resulting from the material and the opening can cause problems in the downstream processes. The challenge is to get the maximum yield from the given material with the optimum settings and technology. Spinning mills using recycled cotton as a raw material need to find the balance between high production, good yarn quality, high raw material yield and low operating costs.
Based on the raw material data and the existing fiber preparation the semi-automated rotor spinning machine R 37 manufactured by Rieter Machine Works Ltd., Winterthur/Switzerland, is a good solution. The spinning box of this machine offers decisive advantages in processing recycled cotton thanks to a higher level of trash extraction. Short fibers are guided well in the feeding and opening areas and most trash, neps and yarn ends which are not fully opened are removed. More good fibers are kept in the spinning process than with other machines. This guarantees better evenness and IPI values which results in lower ends down rates and in economic production. The low energy consumption of the R 37 further reduces operating costs.
The machine produces Ne 10 recycled soft knitting yarn with a delivery speed of 142 m/min. Its overall efficiency is as high as 98-99% with fewer ends down and stable yarn quality. Deshun reports that the R 37 is more energy efficient and easier to operate compared to its former machines. There is no need to use tools when maintaining the spinning box. The rotor bearings can be lubricated without disassembly.