• 专利附录
  • 专利说明
  • 权利要求
  • 类似技术
  • 同族专利
  • 引用文献
  • 法律状态
  • 优先权
    • 专利摘要:
    A control device connected to rotational speed measuring means for an extruder screw, to a filling level monitor in a degassing opening of the extruder, to a cut-off in a filling container for the extruder, to vacuum means connected to the degassing opening and to a source of gas under pressure such that upon receipt from the speed measuring means or the filling level monitor by the control device of an indication of probable filling of the degassing opening with melt, the control device closes the cut-off, disconnects the vacuum means from the degassing opening and connects the gas pressure source thereto.
    公开号:SU921457A3
    申请号:SU782693949
    申请日:1978-12-11
    公开日:1982-04-15
    发明作者:Андерс Дитмар
    申请人:Херманн Бершторфф Машиненбау Гмбх (Фирма)；
    IPC主号:
    专利说明:

    I -. ;
    The invention relates to the processing of thermoplastic polymeric materials, in particular to extruders, in which, during the extrusion process, the polymer must be removed from the polymer by volatile substances through the gas outlet.
    Known extruder for plastics processing, comprising a housing, housed therein and equipped with a rotary drive screw, charging crow-)
    ku C.
    The disadvantage of the extruder is the impossibility of removing volatile substances released from the polymer in the process of its processing.
    The closest to the proposed technical entity is an extruder for processing a mass reservoir, comprising a housing placed 20 therein and equipped with a rotational drive, auger, a charging hopper with a melt reservoir installed on it, a vaporizer element with its movement drive and made in 25
    gas outlet connected by pipeline with vacuum system 2.
    A disadvantage of the known extruder is that polymer melt flows from the extruder barrel into the gas outlet when the screw is stopped, which leads to clogging of the vacuum system.
    The purpose of the invention is to increase the productivity of an extruder by eliminating the clogging of the gas outlet and the vacuum system.
    This goal is achieved by the fact that the extruder, comprising a housing,. placed in it and equipped with a rotary drive screw, a feed funnel with a tank for melt mounted on it, a locking element with a drive for moving it, and a gas outlet opening made in the housing, connected by a pipe. water with a vacuum system is equipped with a tachometer measuring the speed of the auger drive connected through a regulator to the actuator of the locking element 39 and a sensor monitoring the filling level of the gas outlet hole connected by means of the regulator to the switching system of the vacuum system and the overpressure safety device of overpressure connected to the gas outlet. In addition, the switching device is made in the form of ball stop valves; the vacuum system is designed as a water ring pump with closed water circulation; the safety pressure device is made in the form of a tank with compressed inert gas, as well as in the form of a low-pressure sump placed in the upper suit of the tank for melt. The drawing shows an extruder, a general view and a scheme for controlling and regulating the level of a polymer melt. The extruder includes a housing 1, a screw 2, a drive 3 of the screw, a feed hopper with a reservoir 5 installed on it for the melt polymer, a locking element 6 with a drive 7 for moving it, and an exhaust hole 8 made in the housing 1, a vent hole 8 through pipe 9 connected to ball shut-off valves 10 and 11, Ball stop valve 10 through pipe 12 is connected to a vacuum pipe 13 connected to a water tank 1 equipped with an outlet nozzle 15. Ball valve 11 is connected to pipe 17, K 17 is connected to a reservoir 19 with compressed inert gas, and a valve 18 is connected to a tank 5 for polymer melt. A sensor 20 for monitoring the filling level is installed in the discharging port 8. The drive 3 of the screw 2 is equipped with a tachometer 21 measuring the speed of the screw drive. The sensor 20 for controlling the filling level of the vent hole 8 and the tachometer 21 are connected to the regulator 22, which, in turn, is connected to the actuator 7 for moving the locking element and to the ball locking valves 10 and 11, the tank 5 is equipped with a pipe 23 for feeding the melt polyethylene high pressure and nozzle 24 for the release of gaseous efielen. The screw 2 of the extruder is equipped with a degassing zone 25. The extruder operates as follows. The high-pressure polyethylene melt through the pipe 23 enters the tank 5 and through the locking element 6 to the feed hopper C, the screw of the extruder 2 supplies the polymer to the degassing zone 25, where the gaseous ethylene is removed from the polymer melt under the vacuum created by the vacuum pump 13. In this case, the stop ball valve 11 is closed, and the stop ball valve 10 is open and ethylene gas through pipes 9 and 12 is sucked out of the extruder by a vacuum pump 13, is fed through a water tank 1 and an outlet 15 to a gas collector (not shown) and can be reintroduced in the polymerization process. If the rotational speed of the screw 2 is reduced, for example, by 50% of the maximum number of revolutions or the level of polymer melt in the gas outlet 8 rises, the gas outlet filling level sensor 20 triggers, then the regulator 22 closes the ball valve 10, closing the vacuum system, and opens the ball stop valve 11, connecting tank 19 with compressed inert gas (nitrogen) through the open valve (valve 18 is closed) and pipelines 9 and 16 to the gas outlet 8, At etm, the inert gas acts on the polymer melt, To increase its level in the gas outlet hole 8, the regulator 22 simultaneously closes, acting on the actuator 7 of the locking element 6, the feed funnel 4, shutting off the polymer melt in the extruder and, thus, preventing the gas outlet hole and the vacuum system from clogging. In an alternative mode of operation, the valve 17 is closed and the valve 18 is open. In this case, the inert gas tank 19 is disconnected from the gas outlet port 8 and the pressure of ethylene gas in the tank 5 for polymer melt is used as the source. Depending on the method of returning ethylene gas during the polymerization process, the excess pressure in tank 5 is 0.020 6 MPa.
    59
    The proposed extruder avoids a significant increase in the level of the polymer melt in the gas outlet,: 3a due to this in the case of forced; stopping or reducing the speed of the screw prevents the polymer from entering the vacuum system and thereby prevents the extruder from stopping and leaving the normal mode of operation.
    权利要求:
    Claims (5)
    [1]
    1. An extruder for plastics processing, comprising a housing placed therein and equipped with a rotational drive auger, a feed hopper with a tank for melt mounted on it, a locking element driven by its movement and a gas outlet opening made in the housing, o characterized by the fact that, in order to increase productivity by eliminating the clogging of the gas outlet and the vacuum system, the Extruder is equipped with a tachometer for measuring the speed of the auger drive connected through a regulator with a locking element drive, and a control sensor 57
    The filling level of the gas outlet hole is connected by means of a regulator to a switching device of the vacuum system and a safety pressure device of pressurized pressure connected to the gas outlet hole.
    [2]
    2. Extruder pop.1, I distinguish u and with the fact that the switching device is made in the form of ball shut-off valves.
    [3]
    3. The extruder according to claim 1, 1, and the fact that the vacuum system is designed as a water ring pump with closed water circulation.
    [4]
    An extruder according to claim 1, wherein the safety device is designed as a reservoir with a compressed inert gas.
    [5]
    5. An extruder according to claim 1, wherein the safety pressure device is in the form of a low-pressure sump placed in the upper part of the melt tank.
    Sources of information taken into account in the examination
    1. Authors certificate of the USSR, cl. B 29 F 3/00, 196.
    2.US Patent W 3579728,
    l + 25-86, publ. 1371 (prototype).
    类似技术:
    公开号 | 公开日 | 专利标题
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    US5340241A|1994-08-23|Device for metering and entraining a product into a gas stream
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    同族专利:
    公开号 | 公开日
    NL7812360A|1979-06-29|
    FR2413200B1|1984-01-13|
    IT1101193B|1985-09-28|
    IT7831089D0|1978-12-21|
    US4197268A|1980-04-08|
    DE2758265A1|1979-06-28|
    DE2758265C2|1982-12-23|
    FR2413200A1|1979-07-27|
    JPS5495663A|1979-07-28|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    US3148231A|1961-03-20|1964-09-08|Eastman Kodak Co|Plastic extrusion, apparatus and control|
    DE1302684B|1961-06-21|1971-04-01|Automatic Process Control Inc|
    US3244688A|1962-04-16|1966-04-05|Phillips Petroleum Co|Process for processing of polymers|
    DE1201041B|1962-07-10|1965-09-16|Kloeckner Humboldt Deutz Ag|Screw extruder for plastic masses, e.g. B. thermoplastics|
    FR1391200A|1963-02-18|1965-03-05|Du Pont|Improvements in methods and apparatus for manufacturing extruded products from polyamide resins and other fusible polymers|
    US3579728A|1965-07-09|1971-05-25|Phillips Petroleum Co|Polymer separation|
    US3524222A|1968-05-13|1970-08-18|Egan Machinery Co|Extruder screw devolatilizing and mixing section|
    JPS4913260A|1972-05-17|1974-02-05|
    JPS5232776B2|1973-10-27|1977-08-24|
    DE2520244C3|1975-05-07|1978-03-16|Werner & Pfleiderer, 7000 Stuttgart|Loading device for a screw extruder|
    DE2543329B2|1975-09-29|1977-11-24|Paul Troester Maschinenfabrik, 3000 Hannover|DEVICE FOR EXTRUDING PLASTICS AND ELASTOMERS|
    JPS55220B2|1976-04-22|1980-01-07|DE2922572C2|1979-06-02|1983-10-20|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover|Degassing device for screw presses processing thermoplastic molding compounds|
    DE3242239A1|1982-11-15|1984-05-17|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover|DEVICE FOR LEVEL MONITORING OF A DEGASSING DOMES CONNECTED TO A VACUUM SOURCE FOR EXTRUDER|
    JPS6231727B2|1982-12-21|1987-07-10|Ube Industries|
    DE3744193C1|1987-12-24|1989-01-26|Berstorff Gmbh Masch Hermann|Process and extruder for degassing thermoplastic plastic melts over a wide range of viscosities|
    JPH01259922A|1988-04-11|1989-10-17|Toshiba Mach Co Ltd|Vent type injection molding machine|
    DE3816981A1|1988-05-18|1989-11-30|N Proizv Ob Plastmassy|Device for automatically controlling the metered polymer feed from a charging apparatus into an extruder|
    DE3900952C1|1989-01-14|1990-03-22|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover, De|
    DE4017724C1|1990-06-01|1991-03-07|Hermann Berstorff Maschinenbau Gmbh, 3000 Hannover, De|
    US5358453A|1993-10-13|1994-10-25|Mitsuboshi Belting Ltd.|Cogged v-belt|
    US5468429A|1994-04-15|1995-11-21|Li; Tzu-Li|Ultrasound-enhanced devolatilization of thermoplastic plastics|
    US6280667B1|1999-04-19|2001-08-28|Andersen Corporation|Process for making thermoplastic-biofiber composite materials and articles including a poly component|
    CN106003461B|2016-06-08|2017-12-05|厦门川汉环保科技有限公司|Waste plastics recycling utilizes band gas shield and modified granulating integrated device|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE2758265A|DE2758265C2|1977-12-27|1977-12-27|Control device for monitoring the fill level of a degassing opening on an extruder for processing high-pressure polyethylene melt|
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