• 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:
    The invention relates to a method for regulating the supply of energy to a sealing device for the sealing of thermoplastic material, the electric energy being supplied to the sealing device pressed against the combined thermoplastic material with whose help the said electric energy is converted to thermal energy and that the amount of energy supplied to the sealing device is compensated for heat losses brought about by heat leakage during the sealing operation.
    公开号:SU1713429A3
    申请号:SU864027720
    申请日:1986-06-26
    公开日:1992-02-15
    发明作者:Сундсберг Андерс
    申请人:Аб Тетра Пак (Фирма)；
    IPC主号:
    专利说明:

    inner contours of the forming parts 4. Above this tape from consecutive V-shaped parts there is a second tape, the central part of which covers parts of V-shaped spaces, while the marginal zones of the second tape are formed into strips that are folded down for subsequent welding. The cavities formed in this way are filled with a liquid product, which is fed through the filling pipe 5. After the pouring operation, the first and second tapes should be connected to each other with a sealed weld seam, with the raised side walls of the forming parts 4 serving as npoiecc welding. support The generator 1 has a pair of welded concentrators 6 fed from a power source 7,
    When welding foamed plastic material, which consists of a large number of cells with thin walls, it is necessary to regulate the amount of energy that is supplied to the welding zone. Thin walls can not be subjected to high pressure, just because they are destroyed or deposited. Such subsidence also occurs if they are exposed to excessive heat, since they melt.
    Inadequate energy supply leads to the fact that the density and strength of the weld does not meet the requirements of packaging production.
    The control of the welding process consists in adjusting the pulse duration depending on its power so that the total amount of energy supplied during each pulse is One and Teiv. same This is illustrated in FIG. 2, where the pulse duration is plotted along the axis of the emission curve, and power is plotted along the ordinate axis. Assuming that the power during each individual pulse does not change, the graph of this dependence is a hyperbola 8, and equal in area squares I (ABDC), II and III approximate the amount of energy supplied in each pulse.
    However, there are still heat losses that are proportional to the duration of the welding pulse. This means that the welding energy depends on the duration of the pulse and with long duration pulses it can be reduced to such an extent that the welding result will not meet the requirements.
    This is illustrated by the diagram in FIG. 2, which shows the distribution of power depending on the pulse duration, demonstrating the interrelation
    between power and time to achieve a satisfactory welding result. Heat losses are marked by hatched rectangles 9.
    The energy that is discharged as heat loss through the packaging material during pulse I is represented by an AEFB rectangle. It must be compensated for the shaded area 9 to cover the thermal losses.
    Point F of the CEFD rectangle, which represents the energy supplied from the source to the working organ, lies on curve 10 (indicated by the dotted line). Curve 10 passes through the corresponding angular points of all compensated pulses.
    The adjustment of the energy impulse is carried out by the system, which is shown schematically in FIG. 3. Generator 1 converts electrical energy into mechanical vibrations, which are transmitted by an ultrasonic concentrator 6, calculated and mechanically tuned in a special way, which can be pressed against the surface to be welded and generate internal friction between the objects to be welded, which are heated to such an extent that thermoplastic surfaces facing each other fuse into a sealed and durable seam.
    The power supplied from the current source depends on the power that the ultrasonic hub 6 takes during the welding operation.
    The power through the wires 11 and 12 is supplied to the ultrasonic generator 1. The wire 12 passes through the current transformer 13, through which current is measured in the wire 12. A resistor 14 is located at the terminals of the secondary winding of the current transformer 13. The voltage across this resistor is transformed through the wire 12. Between the power wires 11 and 12, a voltage divider 15 is turned on, which consists of connected high-resistance resistors. The tap point of this voltage divider represents the transformed voltage between wires 11 and 12. The output voltages from the current transformer 13 and voltage divider 15 are connected to the input terminals 16 and 17 of multiplier 18, in which the voltage at points 16 and 17 are multiplied by one another in order to provide a value proportional to the electric power supplied by the current source 7. The magnitude of this power is proportional to the voltage at the output J9 of the multiplier 18. A current flows through the capacitor, the value of which depends on the capacitance of the capacitor and the voltage on its plates. The capacitor is charged until the voltage on its plates is equal to the charge voltage. The capacitor C is charged by an operational amplifier F, which is controlled by the voltage from the multiplier 18. The amplifier F provides the capacitor C with a constant charging current proportional to the potential at point 19, which represents the amount of electrical power supplied from the source 7 gl1tani. Operational amplifier F in conjunction with capacitor C is an integrator, which is provided by a constant charge current, since the amplifier regulates the potential at a point in such a way as if a direct current flows through the capacitor. To limit the charging current, the multiplier 18 c by the amplifier F includes a resistor 20. The voltage drop across the resistor 20 depends on the magnitude of the charging current. Since the charging current is constant, the voltage drop across the resistor 20 caused by the charging voltage will not change.
    A comparator is connected to the point at the output of the amplifier, which compares the two voltages at the input and, with the same value of these voltages, produces an output signal. Comparator K is connected via wire 21 with a variable resistor 22, one end point of which is grounded, and the other is connected to a constant potential point. Variable resistor 22 is a voltage divider that, by adjusting the position of pin 23, provides a change in the comparison potential at point c. When the potential at point b reaches the value of potential at point c, the comparator generates a control signal, which closes contact S and discharges capacitor C. After that, a new packet moves to concentrator 6, and source 7 generates a new pulse.
    The described scheme does not provide any compensation for heat losses.
    it only provides the supply of pulses from the generator with the same energy content, regardless of the magnitude of the power. Compensation of heat losses is provided by an adjustable resistor connected to point d with a constant potential.
    Regulation of the resistance value of the resistor 24 causes the current to
    through p | ezistor 20 and, therefore, the voltage drop across resistor 20 can vary, providing compensation for heat loss for materials with different thermal conductivity.
    Thus, the duration of the welding pulse can be adjusted through the appropriate setting of the potential at point c using a voltage divider, and the compensation of the heat loss is controlled by the variable resistor 21.
    权利要求:
    Claims (1)
    [1]
    Invention Formula
    An ultrasonic welding process control system in a device for sealing foamed materials, comprising a source of electrical energy, a controller for the duration of the welding cycle and a key element characterized in that
    in order to improve the quality of welding, the welding cycle duration regulator contains a multiplier, an integrating circuit, a comparator, a reference voltage source, an adjustable leakage resistor, and
    the integrating circuit is made in the form of series-connected resistor and capacitor, the amplifier and the key element are connected in parallel with the multiplier connected to the power source, the multiplier output is connected to the integrator circuit resistor, the adjustable leakage resistor is connected to the first capacitor plate, the second plate of which is connected to the first the entrance to the com para, the second entrance is. The latter is connected to a source of reference voltage, and the output is connected to a key element and a source of electricity.
    x,
    Pur.i
    . WITH
    s
    类似技术:
    公开号 | 公开日 | 专利标题
    SU1713429A3|1992-02-15|Control system for ultrasonic welding in an apparatus for sealing cellular plastic materials
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    US3406272A|1968-10-15|Welding apparatus
    EP0389625A4|1990-07-16|Process for resistance diffusion junction.
    US4816285A|1989-03-28|Method and apparatus for measuring a quantity of particles deposited on a metal body to be coated with powder
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    US3441708A|1969-04-29|Welding
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    GB1451648A|1976-10-06|
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    SU400937A1|1973-10-01|METHOD FOR DETERMINING THE PULSE PARAMETERS
    JPH1135014A|1999-02-09|Temperature controlling method of packaging material fusing heater, and its device
    同族专利:
    公开号 | 公开日
    EP0206013B1|1991-09-11|
    SE8503214D0|1985-06-28|
    AT67106T|1991-09-15|
    JPH0751317B2|1995-06-05|
    CA1292408C|1991-11-26|
    EP0206013A2|1986-12-30|
    US4818313A|1989-04-04|
    SE451972B|1987-11-09|
    AU593805B2|1990-02-22|
    SE8503214L|1986-12-29|
    JPS623927A|1987-01-09|
    DE3681349D1|1991-10-17|
    AU5932586A|1987-01-08|
    EP0206013A3|1987-09-30|
    引用文献:
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    DE2405943C3|1974-02-08|1978-04-13|Altstaedter Verpackungs Vertriebs Gmbh, 6102 Pfungstadt|Heat sealing device for joining two webs of packaging material|
    GB1570078A|1975-12-18|1980-06-25|Varian Techtron Pty Ltd|Flameless atomization|
    US4199808A|1977-12-27|1980-04-22|Westinghouse Electric Corp.|Inverse timer with non-interacting potentiometer settings|
    US4313778A|1980-09-22|1982-02-02|Branson Ultrasonics Corporation|Ultrasonic seaming apparatus|
    DD154343A1|1980-12-22|1982-03-17|Wolfgang Klimes|PROCESS FOR LIMITING THE WELDING ENGINE TRANSMITTED TO THE WORKPIECE IN ULTRASOUND LUBRICANTS|
    JPS6153944B2|1981-04-30|1986-11-20|Shimada Rika Kogyo Kk|
    JPS5834024U|1981-08-12|1983-03-05|
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    DE3313918A1|1982-04-20|1983-10-27|Basf Ag, 6700 Ludwigshafen|Process for open and closed loop control of the electrical power required during jointing of thermoplastics by means of ultrasound|
    JPS6240888Y2|1982-05-07|1987-10-20|
    US4513342A|1983-01-31|1985-04-23|General Electric Company|Current-squared-time protection system|
    DE3303452C2|1983-02-02|1986-03-13|Herbert Kannegiesser Gmbh + Co, 4973 Vlotho|Heating device for a device for gluing flat pieces of textile|
    US4696708A|1985-11-13|1987-09-29|Amp Incorporated|Ultrasonic welding|US5244528A|1992-01-06|1993-09-14|Eastman Kodak Company|Photographic negative storage apparatus with illuminated vacuum work holder|
    SE9201280L|1992-04-23|1993-10-24|Tetra Laval Holdings & Finance|Apparatus for ultrasonic sealing of thermoplastic materials including a vibration generator of so-called magnetic magnetostrictive powder composite|
    SE501372C2|1993-06-17|1995-01-30|Moelnlycke Ab|Method and apparatus for controlling the power of the unit during ultrasonic welding|
    SE501603C2|1993-08-13|1995-03-27|Bindomatic Ab|Method and circuitry for indicating appropriate binding time when binding folders|
    WO1995021059A1|1994-02-01|1995-08-10|Wyatt, Tracy, A.|Control of plastic laminate curing press|
    EP0839585A3|1996-10-31|2000-12-27|Eastman Kodak Company|Method and apparatus for testing transducer horn assembly debubbling devices|
    DE19749535A1|1997-11-08|1999-05-27|Bosch Gmbh Robert|Circuit for heating a component|
    JP2000306957A|1999-04-21|2000-11-02|Tdk Corp|Ultrasonic bonding and mounting method and ultrasonic bonding apparatus|
    DE10046451A1|2000-09-18|2002-03-28|Spaichingen Gmbh Maschf|Method and device for ultrasonic welding of workpieces|
    SE518499C2|2001-02-02|2002-10-15|Tetra Laval Holdings & Finance|Apparatus for preparing a package or packaging material|
    DE10324094B3|2003-04-30|2004-09-09|Schunk Ultraschalltechnik Gmbh|Ultrasonic welding system for joining electrical conductors together has converter and sonotrode and has control circuit comparing actual curve of pressure plotted against time with ideal curve|
    US7698926B2|2007-04-26|2010-04-20|Honeywell International Inc.|Electrical connection of energy harvesting devices|
    US10384289B2|2012-06-08|2019-08-20|Illinois Tool Works Inc.|Welding wire feeder bus control system and method|
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    US9662735B2|2012-06-08|2017-05-30|Illinois Tool Works Inc.|Welding wire feeder power application system and method|
    US9878393B2|2012-06-08|2018-01-30|Illinois Tool Works Inc.|Welding wire feeder power control system and method|
    US9463523B2|2012-06-08|2016-10-11|Illinois Tool Works Inc.|Controlled waveform welding wire feeder system and method|
    US10406621B2|2012-06-08|2019-09-10|Illinois Tool Works Inc.|Polarity sensing welding wire feeder system and method|
    JP6457287B2|2015-02-04|2019-01-23|ムネカタインダストリアルマシナリー株式会社|Heat welding equipment|
    US10105787B2|2015-06-05|2018-10-23|GM Global Technology Operations LLC|Systems and methods for ultrasonic welding|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    SE8503214A|SE451972B|1985-06-28|1985-06-28|SET AND DEVICE FOR REGULATING ENERGY SUPPLY TO AN ULTRA SOUND SEAL|
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