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AssigneeSocieta Nazionale Industria Applicazioni Viscosa S.p.A.
InventorsUgo Paoletti, Alessandro Volterra
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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.
In a process for the continuous spinning of viscose rayon yarns, wherein each of a plurality of yarns is caused to travel as coils in a substantially helicoidal path, partly over a treatment roller and a respective advancing roller, while being subjected to a plurality of liquid treatment operations followed by a drying treatment, the improvement of eliminating a portion of the liquid carried by said yarns from said liquid treatment operation before passage to said drying treatment, said improvement comprising:
In an apparatus for the continuous spinning of viscose rayon yarns, said apparatus being of the type including a treatment roller divided into plural treatment zones, including at least one liquid treatment zone and a final drying zone, and a plurality of advancing rollers spaced from and positioned askew with respect to said treatment roller, each of a plurality of yarns being caused to travel as coils in a substantially helicoidal path over said treatment roller and over a respective said advancing roller, whereby said yarns are subjected to a liquid treatment operation in said liquid treatment zone followed by a drying treatment in said drying zone, the improvement of means for eliminating a portion of the liquid carried by said yarns from said liquid treatment zone before passage to said drying zone, said eliminating means comprising:
Dependencies are inferred from the claim text.