Snia Viscosa Societa Nazionale Industria Applicazioni Viscosa S.p.a.

Societa Nazionale Industria Applicazioni Viscosa S.p.a.

Alessandro Volterra

Ugo Paoletti

A device for the continuous spinning of viscose rayon includes a main or cessing roller and a plurality of secondary or advancing rollers set askew with respect to the processing roller. The processing and advancing rollers are carried bracket-like by a support arm in which they are rotatively supported. The actuating structures are located in the vicinity of the supports of the respective rollers. The support arm is hollow and contains the roller supports and the actuating structures, and is located at the end of the unit at which the yarns leave the same after being processed. A plurality of spinning units are arranged in rows and the rows are born by a frame carrying all the necessary accessory devices. Means are provided for preventing the escape of fumes from the treatment liquors into the surrounding room.

Device for the continuous spinning of viscose rayon

The removal of water from viscose rayon yarns in the continuous spinning of such yarns is improved by subjecting the yarns to the action of an air jet before the thermal drying treatment. The air jet impinges on the yarns adjacent their passage from the last liquid treatment zone to the drying zone and is directed approximately tangentially to the treatment roller, that is to the helicoidal path of the yarn. The removal of the water is completed by thermal drying. Up to 50% of the water content, and several times the dry weight of the yarn, is eliminated by the pneumatic treatment. The air jet is directed on the yarn by means of a slit-shaped nozzle having its larger dimension substantially parallel to the treatment roller. A plurality of yarns can be treated concurrently on the same device having a plurality of guide rollers.

Growing community of inventors

Milan, Italy

Alessandro Volterra