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    Method and device for the production of continuous multifilaments having a high degree of cohesion
    1.
    发明授权
    Method and device for the production of continuous multifilaments having a high degree of cohesion 失效
    用于生产具有高水平联合度的连续多元素的方法和装置

    公开(公告)号：US3614817A

    公开(公告)日：1971-10-26

    申请号：US3614817D

    申请日：1969-07-01

    Applicant: SNIA VISCOSA

    Inventor： NICITA DOMENICO ,  MADERNO CESANO ,  LUZZATTO ETTORE

    IPC: D02J1/00 ,  D02J1/08 ,  D02G1/16

    CPC classification number: D02J1/08

    Abstract: A METHOD AND A DEVICE ARE DISCLOSED FOR IMPROVING THE COHESION BETWEEN INDIVIDUAL MONOFILAMENTS OF A COHERED YARN. THE METHOD CONSISTS IN LIMITING THE FREEDOM OF OSCILLATORY MOVEMENT OF THE INDIVIDUAL FILAMENTS AS EXPOSED TO THE ACTION OF A COHERING GAS JET, AND IS CARRIED OUT BY PROVIDING A GROOVED OR SPLINED CYLINDRICAL SURFACE IN THE AREA WHERE THE GAS JET IS ACTIVE ON THE FILAMENTS. THE DIMENSIONS, AND THE DISTANCES AT WHICH THE CYLINDRICAL SURFACE IS PLACED WITH RESPECT TO THE OTHER COMPONENT PARTS OF THE INSTALLATION ARE CRITICAL.

    8.
    发明专利
    未知

    公开(公告)号：DE1435682A1

    公开(公告)日：1969-03-20

    申请号：DE1435682

    申请日：1964-04-17

    Applicant: SNIA VISCOSA

    Inventor： GIACOBONE PIERO ,  NICITA DOMENICO ,  PARMEGGIANI PAOLO ,  PERAZZONI PIERLUIGI

    IPC: D01D5/08 ,  D01D5/084 ,  D01F6/60

    Abstract: 1,034,401. Melt-spinning. SNIA VISCOSA SOC. NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA S.p.A. April 13, 1964 [April 17, 1963], No. 15110/64. Heading B5B. Filaments of linear synthetic polymers are melt-extruded into a gaseous enclosure containing steam at 30‹-200‹ C., forwarded in such a way that they are in contact with the steam for at least 1 second, e.g. 1 to 6 seconds, then passed through a heated space in which every part of the yarn remains for at least 1 second, e.g. 1 to 6 seconds, and finally stretched. The steam treatment may be carried out in presence of air. the proportions of steam and air being such that the air has a relative moisture of at least 85%. The heated space may be a tubular passageway maintained at 20-95‹ C., and the stretching may be effected in one or more stages to a total draw ratio of 1: 4-5. Specified polymers are polyesters, e.g. polyethylene terephthalate, and nylons, e.g. polycaproamide. In one embodiment (not shown) filaments 18 extruded from spinneret 10 into an enclosure 11 are treated with a mixture of air (from fan 14) and steam (from perforated pipe 13) passing through perforated wall 17. The steam-treated filaments are then passed through tube 19 heated by jacket 20, stretched in two stages by pairs of skew cylinders 21, 22, 23 and wound up at 26. The yarns may have a tenacity of 5-9 g./den.

    9.
    发明专利
    未知

    公开(公告)号：DE1435691A1

    公开(公告)日：1969-03-06

    申请号：DE1435691

    申请日：1964-09-24

    Applicant: SNIA VISCOSA

    Inventor： NICITA DOMENICO ,  PARMEGGIANI PAOLO

    IPC: B29C48/92 ,  D01D1/04 ,  D01D1/09

    Abstract: 1,040,499. Melt spinning apparatus. SVIA VISCOSA SOC. NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA S.p.A. Sept. 24, 1964 [Sept. 30, 1963], No. 38953/64. Heading B5B. A melt-spinning apparatus comprises a melting chamber 10 (Fig. 1, not shown), a heated melting grid 12, a feed screw 13 mounted in a shaft 14, a tube 18 for the introduction of solid particulate polymer and a conical sump 11 provided with an outlet for holding a pool of melt. The shaft is rotatably supported in bearings 20, 21 and 23 and has mounted on it toothed wheels 24 and 24 1 (Figs. 1 and 2, not shown), meshing with racks 25 and 25 1 carried on rods 26 and 26 1 connected to the piston 27 working in a cylinder 28. Compressed air in other fluid is introduced into and discharged from cylinder 28 through valves 29 and 29 1 , the fluid being introduced into the cylinder at a pressure which is in accordance with the pressure it is desired to apply to the mass of particulate polymer 30 above the melting grid 12 of the melter 10. As illustrated in Fig. 1 (not shown), compressed air is introduced into the cylinder 28 through the valve 29, while valve 29 1 is open to the atmosphere. If the pressure exerted on the mass of polymer 30 by the screw 13 has not reached a predetermined value, the piston 27 is urged to the right and the toothed wheels 24, 24 1 are rotated in a counter-clockwise and a clockwise direction by the racks 25, 25 1 . Each of the wheels 24, 24 1 mounted on the shaft 14 with a freewheel device in such a manner that the shaft is always rotated in the same direction (the direction being such that the screw 13 causes the polymer to travel downwards towards the melting grid 12) irrespective of whether the piston 27 travels from left to right or vice versa. During the phase shown in Fig. 1, the wheel 24 1 causes the shaft 14 to rotate in a clockwise direction while the wheel 24 freewheels on the shaft. The torque applied to the shaft 14 is constant after the pressure applied to the mass of polymer 30 has reached the predetermined value and the pressure exerted in the polymer by the screw 13 thereafter remains constant. Instead of the driving means illustrated in Figs. 1 and 2, the shaft may be driven by means of a constant torque engine or electric motor.

    10.
    发明专利
    未知

    公开(公告)号：DE2059199A1

    公开(公告)日：1971-06-09

    申请号：DE2059199

    申请日：1970-12-02

    Applicant: SNIA VISCOSA

    Inventor： PARMEGGIANI PAOLO ,  NICITA DOMENICO ,  D ALO' BRUNO

    IPC: B65H51/16 ,  B65H54/88 ,  B65H51/20

    Abstract: A device for pneumatically sucking and dragging the cut ends of textile filaments and yarns traveling at high speeds includes a passage wherein filaments or yarns travel in front of a suction orifice and a related removal duct to which a subatmospheric pressure is imparted. On the other side of the passage and coaxial with the orifice a nozzle is provided to form a superatmospheric pressure air stream incident to the filaments or yarns in cooperation with the suction orifice.

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