• 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 detecting the temperature of a sealing tool of a sealing station of a packaging machine and to a measuring device (15) for performing the method, wherein at least one measuring element (16) comprising a temperature sensor (17) in the measuring device (15 ) is integrated and releasably connected to a controller.
    公开号:CH703394B1
    申请号:CH01129/11
    申请日:2011-07-06
    公开日:2016-11-15
    发明作者:Steinbauer Jürgen；Wachter Veronika；Rothermel Klaus
    申请人:Multivac Sepp Haggenmüller Gmbh & Co Kg；
    IPC主号:
    专利说明:

    The invention relates to a measuring device and a method for detecting the surface temperature of SiegeIwerkzeugen.
    Plastic packaging containers, for example plastic bags, are filled with products and placed in a chamber machine for closing. In this case, the bag is in a closed chamber which is evacuated while the opening area of the bag is in a sealing tool. The sealing tool consists of two strips, one of which strip can be heated in order to transfer the heat necessary for the fusion of the bag opening. The pressure with which the bag is compressed between the strips also plays a major role. In simple applications, it is only necessary to safely close the bag. This also applies to multi-part packaging, which can be produced on thermoforming packaging machines and peel sealers.
    When using the above-mentioned packaging machines in the field of medical technology, the requirements are many times higher. Temperature sensors are integrated in the sealing tools, and these transmit the temperature value measured in the sealing tool to a machine controller of the packaging machine. The control regulates the heating of the sealing tool based on the temperature values. The values measured by the temperature sensors are usually not identical to the temperature at the surface of the sealing tool which comes into contact with the sealing medium for sealing. Therefore, before the start of production, the correction value usually has to be determined as the difference between the temperature values of the temperature sensor in the sealing tool and a measurement on the surface.
    In medical applications, it may also be necessary to periodically check or re-evaluate the correction value to maintain consistent production conditions. This can only be achieved with consistent measurement methods.
    Thermal imaging cameras and temperature measuring devices are used to compare the surface temperatures of the sealing tool with the values measured in the sealing tool. These measurements are not feasible under operating conditions (i.e., during the sealing process itself) because there is no accessibility because the sealing tools in thermoforming packaging machines and tray sealing machines are in operation in closed work stations. In chamber machines, the sealing bar is inaccessible by closing the lid.
    Another problem is measuring errors. When measuring manually with a temperature sensor of a meter it comes to irregularities, since the measuring position is not always the same at the heated sealing temperature sealing tool and the temperature sensor not with constant pressure and with constant contact surface at the Sealing tool surface is created.
    Equally problematic is the fact that with a temperature sensor at different measuring points, a time difference occurs and thus lead temporal temperature fluctuations to different readings.
    The measured results are entered manually in lists and enclosed as test records, possibly electronically stored as documents.
    The object of the present invention is to provide a method and a measuring device are available in which the disadvantages described above can be eliminated.
    This object is achieved by a measuring device according to claim 1 and a method for detecting the surface temperature of sealing tools according to claim 4. Advantageous developments of the invention are specified in the dependent claims.
    The invention provides that a measuring device for detecting the surface temperature of a sealing tool a sealing station of a packaging machine, preferably a chamber machine, a thermoforming packaging machine or Schalenverschliessmaschine is introduced into the sealing station, e.g. after the production mode of the packaging machine has stopped or has not been continued. For this purpose, the sealing station or the chamber lid is opened and the measuring device is introduced into the sealing station. The sealing station with the internal measuring device is closed. The sealing tool is pressed against the measuring device and the detection of the surface temperature of the sealing tool at a predetermined time, preferably after reaching the set temperature of the sealing tool performed. For this purpose, at least one measuring element is integrated in the measuring device, which comprises a temperature sensor and a holder and is detachably connected to a controller for detecting, evaluating, storing and / or displaying the measured temperature values.
    The lifting movement for pressing the sealing tool to the measuring device can be performed by diaphragm, pneumatic cylinder or by means of an electric motor drive, preferably with a servo motor. Other similar acting systems such as prestressed springs are conceivable.
    Once the sealing bar has reached a predetermined temperature value, the measurement is performed. In this case, all temperature sensors preferably measure the temperature on the surface of the sealing tool simultaneously at the respective measuring points. The determined temperature values of the sensors can be sent directly to the controller or, alternatively, sent to a datalogger and stored there, the datalogger then providing the measured values for the controller at a later time.
    After completion of the measurement, the sealing station or the chamber lid is opened again and the measuring device taken out, and the production operation of the packaging machine can be added or continued.
    This method allows a very simple way a repeatable measurement method with a very small amount of time.
    According to the inventive method, the measuring device is connected to a controller, preferably the machine control of the packaging machine. This can be done by a plug connection inside the sealing station or by a wireless data line. Thus, the controller can specify the sequence and thus the specification for the temperature for the sealing tool and times for the temperature measurement and the measurement process run automatically. The measured values can be displayed on a display device of the controller, preferably directly in comparison with the set values for the sealing tool and / or the temperature sensor present in the sealing tool.
    For the welding of two plastic films by temperature and pressure of the sealing tool, the surface temperature at the location of the sealing tool is critical, at which the sealing tool is in contact with the plastic films. Thus, the surface temperature is measured there.
    Advantageously, the controller can determine a correction factor from the measured values of the temperature sensors of the measuring device and the sealing tool and the default values for the temperature of the sealing tool to the temperature value of the sealing tool displayed on the controller, obtained by the temperature sensors permanently installed in the sealing tool to adjust the temperature value determined by the measurement with the measuring device according to the invention. In this way, the temperature sensors permanently installed in the sealing tool are calibrated by the more accurate measurement with the measuring device according to the invention. For simple controls, it is conceivable that the machine operator determines the correction factor from the displayed values and inputs it to the controller.
    An advantageous embodiment of the method according to the invention also provides for detecting the measured values from at least two temperature sensors and for forming the correction value as the mean value of the measured values. When using several uniformly distributed temperature sensors, an average value of the measurement results can be formed in order to better detect possible temperature fluctuations within the sealing tool and thus to improve the quality of the temperature control.
    A measuring device for carrying out the inventive method for detecting the surface temperature of sealing tools of packaging machines comprises at least one measuring element, which is integrated in the measuring device, wherein the measuring element comprises a temperature sensor and a holder. The holder is advantageously made of heat-conducting material, preferably made of aluminum. As soon as the measuring element comes into contact with the sealing tool, the heat is transferred to the holder, which assumes the same temperature as the sealing tool very quickly. The holder is preferably in contact with the sealing tool with a large part of its surface in order to make the temperature transition as efficient as possible and thus in a timely manner. The temperature sensor integrated in the holder measures the temperature of the holder and makes this measured value available to an evaluation unit. The measuring device is advantageously designed as a Teflon plate, in which at least one measuring element and a temperature sensor is integrated, since Teflon has a high temperature resistance and measurement errors are avoided by an undesirable heat transfer from the measuring element to the Teflon plate.
    The inventive measuring device is releasably connectable to a controller, which is preferably part of the machine control of the packaging machine. The controller is used to acquire, evaluate, store and / or display the measured temperature values. The plug-in connection between the measuring device and the controller ensures a quick and easy change of the measuring device. Energy and data lines can be realized via the connection.
    In order to obtain comparable measurement results, it is particularly advantageous if the measuring device has at least one positioning element, which defines a defined position of the measuring device relative to the sealing tool. This can be carried out, for example, via stops, incorporated grooves in the Teflon plate or positioning bolts, which are matched with respect to the position with the sealing tool or the corresponding counter-tool, which is located on the opposite side of the packaging medium.
    In the following, an advantageous embodiment of the invention is illustrated in more detail with reference to a drawing.<Tb> FIG. 1 <SEP> shows a schematic view of a chamber machine,<Tb> FIG. 2 <SEP> shows a schematic view of a chamber machine with open chamber lid in section with packaging,<Tb> FIG. 3 <SEP> shows a schematic view of a chamber machine with a closed chamber cover in section with a measuring device according to the invention,<Tb> FIG. 4 <SEP> is a schematic view of a chamber chamber closed chamber chamber machine during measurement,<Tb> FIG. FIG. 5 shows an enlarged view of the measuring device according to the invention in section. Identical components are given the same reference numerals throughout the figures.
    Fig. 1 shows a chamber machine 1, as known from the prior art. There is a lower chamber part 2 and a chamber lid 3 and an existing inside the chamber 4 back pressure bar 5 can be seen. The chamber lid 3 is in the open position, so that an operator can insert one or more filled with product 7 bag 8 (see Fig. 2) in the chamber interior 4 that the bag neck 9 rests on or on the counter-pressure strip 5, since the Back pressure bar 5 defines the position of the seal, as shown in Fig. 2.
    The seal is made by a sealing bar 10 which is adjustably mounted on the chamber lid 3, which is controlled by a controller 11 heated by heating elements, not shown, and is regulated to a predetermined temperature by the operator. A temperature sensor 12 integrated in the sealing bar 10 is connected to the controller 11 via a data line 13 and supports the regulation of the temperature of the sealing bar 10. The sealing takes place by closing the chamber lid 3 and creating a negative pressure in the chamber interior 4 around the chamber lid 3 to keep closed at the bottom of the chamber 2. After reaching a set vacuum, the sealing bar 10 presses by means of an adjusting device 14 the bag neck 9 of the bag 8 on the counter-pressure strip 5. The sealing takes place by heat and pressure, so that the two sides of the bag neck 9 merge together.
    Fig. 3 shows the used instead of the bag 7 measuring device 15. In order to achieve a defined position of the measuring device 15 to the sealing bar 10, the measuring device 15 is placed on the back pressure bar 5. By a groove or cut-out, which is designed according to the dimensions of the counter-pressure strip 5, the measuring device 15 is centered and executed this situation with respect to the sealing rail repeatable.
    In the measuring device 15, a measuring element 16 with a temperature sensor 17 is integrated. The temperature sensor 17 is connected via a connection 18, e.g. a signal, power and / or data line, via a connector 19 to the controller 11 detachably connected.
    In Fig. 4, the chamber lid 3 is closed and according to the inventive method, the operating state is initiated. In this case, the chamber interior 4 is evacuated by means of a vacuum pump, not shown. The negative pressure in the chamber interior 4 pulls the chamber lid 3 against the machine base 2.
    Once the set evacuation of the chamber interior 4 is reached, the sealing bar 10 is pressed by means of the adjusting device 14, as shown in Fig. 4, on the back pressure bar 5 with a force F. The sealed to a predetermined temperature seal bar 10 then transfers the heat energy to the measuring element 16. Already after a short time the measuring element 16 reaches the same temperature as the sealing bar 10. This only leads to a negligible decrease in temperature in the sealing bar 10, since these in proportion to the measuring element 16 has a much higher heat capacity. The measured value detection begins, and the measurement result of the temperature sensor 17 is sent via the data line 18 to the controller 11. In an advantageous variant, a plurality of temperature sensors are distributed on the measuring device at equal intervals in order to form an average value in the control based on the individual results of the temperature sensors.
    Fig. 5 shows the inventive measuring device 15 with the measuring element 16, which has a holder 19 made of heat-conducting material and for receiving a temperature sensor 17. As a positioning a groove 20 on the opposite side of the measuring element 16 in the measuring device 15 is present. The positioning element 20 is designed according to the counter-pressure strip 5 and may be limited according to the length of the counter-pressure strip 5 or set by further stop elements or positioning pins, not shown, the desired position.
    Embodiments of thermoforming packaging machines and tray sealing machines are also conceivable. The sealing tools are designed here in the form of heated surrounding frames, in contrast to the line-shaped sealing rails in chamber and chamber belt machines. The sealing tools are preferably permanently heated and are pressed at the time of sealing against the packaging media and a sealing tool lower part in the form of a chamber for a predetermined duration. Likewise, it is also conceivable that sealing tool and counter-pressure bar are exchanged in their position and thus the counter-pressure bar is used as a moving component.
    In addition to the temperature sensors, sensors for detecting the sealing pressure can be integrated into the measuring device. The measured values of the pressure sensors can also be used for the validation of the sealing pressure, since this may be necessary above all in the medical field, since the sealing process is determined by the parameters pressure, temperature and time. Sealing pressure and sealing temperature can be measured in particular at the same time.
    权利要求:
    Claims (6)
    [1]
    1. Measuring device (15) for detecting the surface temperature of a sealing tool (10) of a sealing station of a packaging machine (1), wherein at least one measuring element (16) in the measuring device (15) is integrated and wherein the measuring element (16) has a temperature sensor (17) characterized in that the measuring element (16) comprises a holder (19) and with a controller (11) for detecting, evaluating, storing and / or displaying the measured temperature values, which is in particular part of a machine control of the packaging machine (1), is detachably connectable.
    [2]
    2. Measuring device (15) according to claim 1, characterized in that the holder (19) is made of a thermally conductive material, preferably made of aluminum.
    [3]
    3. Measuring device (15) according to any one of claims 1 or 2, characterized in that the measuring device (15) has at least one positioning element (20) which is designed such that when pressing the sealing tool (10) to the measuring device (15) define a predefined position of the measuring device (15) relative to the sealing tool.
    [4]
    4. A method for detecting the surface temperature of a sealing tool (10) of a sealing station of a packaging machine (1) using the measuring device (15) according to one of the preceding claims and preferably for matching a displayed temperature value to the temperature value determined by the measurement, comprising the following steps:Opening the sealing station,Inserting the measuring device (15) into the sealing station for detecting the surface temperature of the sealing tool (10),Closing the sealing station,Pressing the sealing tool (10) to the measuring device (15),Detecting the surface temperature of the sealing tool (10),Opening the sealing station,Remove the measuring device (15) from the sealing station.
    [5]
    5. The method according to claim 4, characterized in that a correction factor in a controller (11) for detecting, evaluating, storing and / or displaying the measured temperature values, which is detachably connected to the measuring device, entered or automatically in the controller (11). is determined to equalize a temperature value displayed by means of the controller (11) to the temperature value determined by the measurement.
    [6]
    6. The method according to claim 5, characterized in that the correction factor is formed as the mean value of measured values of at least two temperature sensors (17).
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    同族专利:
    公开号 | 公开日
    DE102010026618B4|2012-05-24|
    CH703394A2|2012-01-13|
    DE102010026618A1|2012-01-12|
    引用文献:
    公开号 | 申请日 | 公开日 | 申请人 | 专利标题
    DE1917194B2|1969-04-03|1972-07-13|Hueck& Cie, 8481 Pirkmuhle|DEVICE FOR MAINTAINING THE TEMPERATURE OF ELECTRICALLY HEATED SEALING TOOLS|
    US3925139A|1974-01-10|1975-12-09|Package Machinery Co|Seal monitoring apparatus|
    US4856260A|1988-10-17|1989-08-15|Baxter International Inc.|Apparatus for sealing a web of film in a packaging|DE102012017827B4|2012-09-10|2021-07-15|Multivac Sepp Haggenmüller Se & Co. Kg|Method for operating a chamber machine|
    CN103879601B|2014-03-13|2015-10-07|江苏腾通包装机械有限公司|Vacuum chamber wrapping machine online quality control device|
    CN103879600B|2014-03-13|2015-10-07|江苏腾通包装机械有限公司|Packaging bag enclosing quality detection device|
    DE102014006566B4|2014-05-07|2021-06-17|Rische + Herfurth GmbH|Calibration set for a welding device, in particular a film welding and / or heat sealing device, and calibration method for a welding device|
    DE202015002572U1|2015-04-10|2016-05-11|Multivac Sepp Haggenmüller Gmbh & Co. Kg|Vacuum chamber machine|
    法律状态:
    优先权:
    申请号 | 申请日 | 专利标题
    DE102010026618A|DE102010026618B4|2010-07-09|2010-07-09|Method for detecting the temperature of sealing tools|
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