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    4.
    发明专利
    未知

    公开(公告)号：IT979493B

    公开(公告)日：1974-09-30

    申请号：IT2087173

    申请日：1973-02-26

    Applicant: SNIA VISCOSA

    Inventor： SICLARI F ,  MAGNONI F

    IPC: B01D1/22 ,  C08F2/00 ,  C08G63/00 ,  C08G63/78 ,  C08G85/00 ,  F16C33/10 ,  F16N15/00 ,  C08F

    Abstract: 1426129 Polymerization process SNIA VISCOSA SOC NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA SpA 25 Feb 1974 [26 Feb 1973] 8425/74 Heading C3R In a polymerization process wherein the reaction mixture is passed through a series of thin layer evaporators, the lower bearings of the rotors which are inside the evaporators are lubricated with some of the polymer being formed and which has suitable physical properties. The polymer increases in molecular weight as it passes through the series of evaporators and some is withdrawn at the point where the viscosity at the operating temperature is suitable for its use as a lubricant. The polymerization may be an esterification, e.g. the manufacture of polyethylene terephthalate, and the polymer may be used as a lubricant when it has an intrinsic viscosity of 0À15 to 0À30.

    5.
    发明专利
    未知

    公开(公告)号：BE764751A

    公开(公告)日：1971-08-16

    申请号：BE764751

    申请日：1971-03-24

    Applicant: SNIA VISCOSA

    Inventor： SICLARI F ,  MAGNONI F ,  BIANUCCI G

    IPC: B23K26/14 ,  D01G1/02 ,  D01G

    Abstract: 1312188 Stapling fibres SNIA VISCOSA SOC NAZIONALE INDUSTRIA APPLICAZIONI VISCOSA 19 April 1971 [26 March 1970] 25364/71 Heading D1F In a method of continuously cutting a flattened tow of continuous filaments into staple fibres, the tow is fed at constant speed past a station whereat the filaments are thermally sheared by a pulsed laser beam. The latter is focussed to provide a rectangular beam having in the plane of the cutting station a crosssection with a major side greater than the width of the tow and a minor side of a few microns. The time interval between successive pulses of the beam corresponds to the time taken to advance the tow by an amount equal to a predtermined fibre length and the pulse duration is less than one thousandth of a second. The laser has a wavelength corresponding to that of a main absorption band of the material, e.g. nylon or polyester, of the filaments. As shown, a tow 18 is fed between counter-rotating, endless chain tracks 20 and 22, in the form of metal or non-metallic bands, guided by pulleys 24, 26 and 28, 30, at least one of each pair of which is driven. Track 20 is formed with rectangular windows 32 spaced uniformly therealong at intervals equal to the highest common factor of all the lengths of staple fibre into which the filaments may be required to be cut. A laser beam pulse 14, emanating from a generator 10, which may cooperate with interruptor means, e.g. an apertured rotating disc (not shown) and emerging through a window 12, passes through aligned windows 32 to sever the tow. Slit nozzles 36, 38, emit jets of inert gas, such as compressed nitrogen, against the tow above and below the zone where the laser strikes, to ensure immediate dispersal of heat and to prevent oxidation. Excess laser beam energy may be absorbed by track section 22 or this may also comprise windows (not shown) through which the laser passes to a cooled screen.

    6.
    发明专利
    未知

    公开(公告)号：BR7107054D0

    公开(公告)日：1973-03-29

    申请号：BR705471

    申请日：1971-10-21

    Applicant: SNIA VISCOSA

    Inventor： MORANDI B ,  SICLARI F ,  MAGNONI F

    IPC: B01F3/12 ,  C08G63/78

    Abstract: 1374623 Mixing SNIA VISCOSA SOC NAZIONALE INDUSTRIA APPLICAZION I VSCOSA SpA 21 Oct 1971 [12 Oct 1970] 49047/71 Heading B1C Apparatus, e.g. for forming a homogeneous paste from terephthalic acid and ethylene glycol as a stage in polyester production comprises a vessel 10, means 22, 24 for feeding metered quantities of the materials to be mixed into the vessel 10, mechanical mixing means 12, means 26 for continuously removing the paste, and heat removing means for limiting the mixing temperature to not above 50‹C. The mixing means 12 may comprise vertical blades 12' driven by a motor 14, cooling water, e.g. at 15‹C being circulated through a jacket 16 with an inlet 18 and outlet 20. The paste, removed by a valve 26 and pump 28 may be recirculated through conduits 30, 32, 34 provided with sampling means 38, while pumps 42, 44 provided with valves 46, 48 control flow through a duct 50, e.g. to an esterification reactor.

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