JP2013154913A - Heating controller for packaging machine - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a heating controller for a packaging machine capable of lessening insufficient welding of a sheet even when ambient temperature or temperature of a heater block is low.SOLUTION: In a packaging machine 10 including heater blocks 12 and 16 incorporating heaters 12a, 16a and 16b and temperature sensors 13 and 17, and a heating controller 1 energizing the respective heaters 12a, 16a and 16b based on detected temperature by the temperature sensors 13 and 17, the heating controller 1 is constituted of a storage part which sets heating data comprising optional set temperature and energizing time of each heater corresponding to the set temperature for each set temperature, and stores a plurality of pieces of the heating data, and a control part which determines the heating data corresponding to the detected temperature, and selects the energizing time from the heating data. Accordingly, even when the temperatures of the heater blocks 12 and 16 are low, the energizing time corresponding to the detected temperature is selected for the respective heaters 12a, 16a and 16b, whereby satisfactory welding of the sheet 81 can be performed.

Description

  The present invention relates to a heating control device of a packaging machine for welding a sheet made of a synthetic resin by heat.

  In describing a conventional heating control apparatus, first, a general packaging machine will be described with reference to FIG. As the packaging machine 10, those shown in Patent Document 1 and Patent Document 2 are publicly known. An original film 80 in which a sheet 81 made of a synthetic resin or the like is wound in a roll shape, and the original film 80 A feed roller 62 that rotatably supports the outer periphery and is connected to a motor 60 that is an example of a rotational drive source, a guide member 42 that changes the posture of the sheet 81 so as to wind both ends of the sheet 81, and the sheet 81 A cylinder former 40 that takes a cylindrical shape, a roller 51 that feeds a cylindrically shaped sheet 81 forward by driving a motor 50 that is an example of a rotational drive source, and a cylinder 14 that is an example of a reciprocating drive source. Connected to the longitudinal seal unit 11 which is connected and welds the overlapping portions of both ends of the sheet 81, and the cylinder 20 which is an example of a reciprocating drive source, and welds the sheet 81. A drive controller (not shown) that is connected to the horizontal seal unit 15 that forms the bottom and the top, and drive sources such as the motors 50 and 60 and the cylinders 14 and 20, and that sends operation commands to the drive sources. And a heating control device 1 (1y) connected to the vertical seal unit 11 and the horizontal seal unit 15 for controlling the welding of the sheet 81.

  The vertical seal unit 11 includes a heater 12a that is heated by energization, a heater block 12 to which the heater 12a is attached, and a temperature sensor 13 that is incorporated in the heater block 12 and can detect the temperature in the vicinity of the heater 12a. The Further, the vertical seal unit 11 is disposed in the vicinity of the tubular former 40, and the operation of the air cylinder 14 can hold down the overlapping portions at both ends of the tubular sheet 81 described above.

  On the other hand, the horizontal seal unit 15 can detect heaters 16a and 16b that are heated by energization, a heater block 16 to which the heaters 16a and 16b are attached, and a temperature in the vicinity of the heater 16a that is incorporated in the heater block 16. And a temperature sensor 17. Further, the horizontal seal unit 15 is arranged at the lower part of the cylinder former 40, and can hold down two places in the vertical direction of the seat 81 by the operation of the air cylinder 20 or the like.

  The drive control device is connected to the motors 50 and 60, the cylinders 14 and 20, and the like, and is configured to be able to control the feeding operation and pressing operation of the sheet 81. Further, since this drive control device is connected to the heating control device 1 (1y), the welding operation of the sheet 81 can be controlled by a series of flows in addition to the above-described feeding operation and pressing operation. The

  As a result, the packaging machine 10 receives a command from the drive control device and sends out the sheet 81 in a fixed amount, operates the vertical seal unit 11 to weld the overlapping portions of both ends of the sheet 81, and the drive control device. The horizontal seal unit 15 is pressed against the sheet 81 and welds two portions in the horizontal direction of the sheet 81. The two places in the lateral direction indicate the upper part of the bag 82 formed by heating the heater 16b and the bottom part formed by heating the heater 16a. Thereafter, a desired part 90 to be packed is loaded from above the cylinder former 40 and reaches the bottom.

  Next, details of the conventional heating control device 1y are described in Patent Document 2 and will be described below. In the conventional heating control apparatus 1y, the heaters 12a, 16a, 16b and the temperature sensors 13, 17 are connected, respectively, and a temperature correction for comparing the temperature detected by the temperature sensors 13, 17 and a preset temperature set in advance. And a phase control circuit for controlling the conduction angle of the AC power supply to the heaters 12a and 16a connected to the power supply voltage correction circuit and the temperature correction circuit. The

  Further, in the heating control to the heaters 12a, 16a and 16b in the conventional heating control apparatus 1y, the temperature sensors 13 and 17 detect the heat storage amounts near the heaters 12a and 16a, that is, the temperatures of the heater blocks 12 and 16, respectively. . Thereafter, power supply voltages supplied to the heaters 12a, 16a, and 16b are set based on the detected temperatures of the heater blocks 12 and 16, respectively. The power supply voltage supplied to each heater is set by the power supply voltage correction circuit, the conduction angle of the AC power supply is controlled by the phase control circuit, and the supplied power supply voltage is limited. In other words, the conventional heating control can be rephrased as power supply voltage control in which the limited power supply voltage is varied and the heaters are energized based on a preset short energization time.

  By the way, if the thickness of the sheet 81 is thin, the power supply voltage is set low to suppress the heating of each heater to prevent the welded portion from being broken, while the sheet 81 is thick. If there is, the power supply voltage is set high to prevent the occurrence of insufficient welding of the welded portion due to insufficient heating of each heater. Further, the amount of heat stored in the heater blocks 12 and 16 is small when the packaging machine 10 has been stopped for a long period of time, but is large when the packaging machine 10 is continuously operated, and the heater blocks 12 and 16 depend on the operating status of the packaging machine 10. The temperature difference is large. As described above, it is necessary to perform heating control of each heater in accordance with the thickness of the sheet 81 to be used or the operating state of the packaging machine 10 and perform satisfactory sheet welding even under various welding conditions.

JP 2003-72711 A Japanese Utility Model Publication No. 62-40888

  However, the conventional heating control device 1y has a problem that it cannot perform welding satisfying all the welding conditions described above. This is because, as described above, the energization time is set to a fixed time, and the range in which the power supply voltage supplied to each heater can be increased or decreased is limited. Specifically, since there is an upper limit or a lower limit that can be set for the power supply voltage, for example, the energization time is set so that good welding can be performed only in the thick welding conditions at the expense of the thin welding conditions of the sheet 81. Based on this, the power supply voltage was set to the upper limit. Further, for example, the power supply voltage is set to the lower limit based on the energization time so that only a high temperature welding condition during continuous operation can be performed at the expense of the low temperature welding conditions of the heater blocks 12 and 16. It was.

  Further, the conventional heating control device 1y changes the power supply voltage corresponding to the temperature of the heater blocks 12 and 16 in accordance with the type of the sheet 81 to be used every time the thickness or material of the sheet 81 is changed. There was a problem that the setting had to be changed and it took time to change the setting.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a heating control apparatus that can reduce the occurrence of defects due to insufficient sheet welding even when the ambient temperature or the amount of heat stored in the heater block is low. In order to achieve this object, the present invention provides a heater that can be heated by energization to weld a sheet, a temperature sensor that can output a voltage corresponding to its own temperature, and a heater that incorporates both the heater and the temperature sensor. In a packaging machine including a block and a heating control device that converts the voltage of the temperature sensor into a temperature and energizes the heater based on the detected temperature, to an arbitrary set temperature and the heater corresponding to the set temperature The heating data in which the energization time is set in advance, a storage unit that sets the heating data for each set temperature and stores a plurality of heating data, and the heating data at the set temperature that matches the detected temperature are determined. And a control unit for selecting the energization time. The heating data is preferably set in advance for each type of the sheet to be used. Further, the set temperature may be set in an arbitrary range.

  The heating control device 1 of the present invention compares the detected temperature of the detected heater blocks 12 and 16 with a preset temperature, selects the energization time corresponding to the preset temperature, and selects the heater 12a and the heater 12a and the heater 12a. A predetermined voltage is supplied to the heaters 16a and 16b over the selected energization time. For this reason, for example, even when the heaters 12a, 16a, 16b are not energized for a long time and the heat storage amount of the heater blocks 12, 16 is low, the energization time corresponding to the heat storage amount is set. Therefore, the temperature of the heater blocks 12 and 16 reaches a predetermined temperature when the sheet 81 is welded. Therefore, the heating control apparatus 1 of the present invention has an advantage that the sheet 81 can be satisfactorily welded even when the temperature of the heater blocks 12 and 16 is low or high due to the influence of the ambient temperature or the like. In addition, since the heating data can be set by adding the material and / or thickness of the sheet 81, if the sheet type to be used when changing the sheet 81 is selected, the corresponding sheet type can be selected. Heating can be controlled using corresponding heating data. For this reason, the heating control apparatus 1 of the present invention only has to select the type of the sheet to be used once when changing the sheet, so that there is an advantage that it does not take time to change the setting of various conditions related to the welding of the sheet as in the prior art. is there. Furthermore, since the heating control apparatus 1 can set the set temperature in an arbitrary range, there is an advantage that the number of the heating data set in advance can be minimized.

It is a block diagram of the heating control apparatus of one Example concerning this invention. It is a schematic explanatory drawing of a general packaging machine.

  An embodiment of the present invention will be described below with reference to FIGS. As shown in FIG. 2, the heating control apparatus 1 of the present invention includes a temperature converter 4 connected to the temperature sensors 13 and 17, a voltage applying unit 5 connected to the heaters 12a, 16a and 16b, and the temperature. The control unit 2 connected to the converter 4 and the voltage applying unit 5, the storage unit 3 connected to the control unit 2 for storing heating data, etc., which are conditions for energizing the heaters 12a, 16a, 16b, It is comprised from the input means 6 which can input the parameter of heating data into the memory | storage part 3. FIG. In addition, since the heating control apparatus 1 of the present invention is used in place of the heating control apparatus 1y of the packaging machine 10 as shown in FIG. 1, detailed description of the packaging machine 10 is omitted here.

  The temperature converter 4 can detect an output voltage of a thermocouple (not shown) incorporated in the temperature sensors 13 and 17 and can convert the output voltage into a temperature. This converted temperature (hereinafter referred to as detected temperature) is not only the temperature of the temperature sensors 13 and 17, but also the temperature of the heater blocks 12 and 16 in the vicinity of the heaters 12a and 16a. The detected temperature is detected immediately before the sheet 81 is welded, and the heating data to be described later is selected based on the detected temperature.

  The voltage applying unit 5 is configured to be able to apply a predetermined voltage to the heaters 12a, 16a, and 16b, respectively, and the heaters 12a, 16a, and 16b are energized for a predetermined time to the voltages applied to the heaters. To heat. In this embodiment, the voltages applied to the heaters 12a, 16a, and 16b are common fixed voltages obtained from a voltage converter (not shown), and this fixed voltage is the vertical seal unit 11. After the horizontal seal unit 15 comes into contact with the sheet, it is applied to each heater 12a, 16a, 16b.

  The heating data includes three parameters including an arbitrarily set temperature, energization time to the heaters 12a, 16a, and 16b at the set temperature of the heater blocks 12 and 16, and the type of the sheet 81 to be used. It is related as one piece of data. The energization time is set based on the temperature of the heater blocks 12 and 16 and the type of the sheet 81 to be used, so that the sheet 81 can be satisfactorily welded under various welding conditions.

  Note that the material and / or thickness of the sheet 81 used for the heating data can be added, so that even when different types of sheets are welded, it is possible to cope with them. Furthermore, since the set temperature of the heating data can be set as a range such as 10.0 degrees or more and 25.0 degrees or less, the number of heating data can be reduced.

  The storage unit 3 is connected to the control unit 2 and an input unit 6 to be described later, and is configured to be capable of storing a plurality of the heating data via the input unit 6. Further, the storage unit 3 is configured to be able to register the type of the sheet 81 being used, and when changing the sheet 81, the operator can select the type of sheet to be used by using the input means 6 described later.

  The control unit 2 is connected to the temperature converter 4, the voltage application unit 5, and the drive control device, and receives the detected temperature from the temperature converter 4 in response to a command from the drive control device. Then, the detected detected temperature is compared with the set temperature of the heating data corresponding to the type of sheet in use. Further, the control unit 2 determines the energization time to the heaters 12a, 16a, and 16b from the heating data selected by the comparison described above, and applies the fixed voltage to each heater over the energization time. Commands to the application section 5.

  The input means 6 is provided with a plurality of switches composed of numeric keys and the like, and these switches can be operated by an operator so that the heating data and the like can be input to the storage unit 3.

  Next, the operation will be described. The packaging machine 10 drives the motors 50 and 60 according to commands from the drive control device to feed the sheet 81 in a fixed amount, and then operates the cylinders 14 and 20. Thereby, the sheet 81 is sandwiched between the heater 12a and the cylinder former 40 of the vertical seal unit 11 at the overlapping portions of both ends, and the sheet 81 of the horizontal seal unit 15 disposed below the vertical seal unit 11 is inserted. It is sandwiched between the heaters 16a and 16b, respectively. Thereafter, the heating control device 1 sends a signal for instructing temperature measurement from the control unit 2 to the temperature converter 4 according to a command from the drive control device, and the temperature converter 4 is connected to the heater blocks 12 and 16. The detected temperatures converted into temperatures are respectively sent to the control unit 2. The control unit 2 compares the heating data corresponding to the detected temperature from the heating data corresponding to the type of the sheet 81 being used, and determines. The energizing time for energizing each heater 12a, 16a, 16b is selected from the heating data selected by this determination, and the voltage applying unit 5 is commanded to supply a fixed voltage over the energizing time. As a result, each heater 12a, 16a, 16b is energized with a fixed voltage for a predetermined time, and each part of the sandwiched sheet 81 is melted and well welded. When all the energization times have elapsed, a signal indicating that welding has been completed is sent from the control unit 2 to the drive control device, and the drive control device returns the cylinders 14, 20 and the like to the vertical seal unit 11. The lateral seal unit 12 is moved away from the sheet 81. In response to this, an operator (not shown) throws the part 90 from above the tubular former 40, and the part 90 is moved to the bottom of the bag 82 by the heater 16a of the lateral seal unit 12 in the next process. It is thrown.

  As described above, the heating control apparatus 1 according to the present invention controls the heating based on the type of the sheet 81 and the energization time of each heater, so that it matches the type of the sheet 81 or the temperature of the heater blocks 12 and 16. The optimal energization time can be set. For this reason, for example, even if the temperature of the heater blocks 12 and 16 is low or high due to the influence of the ambient temperature or the like, there is an advantage that the sheet 81 can be favorably welded. In addition, there is an advantage that fine setting can be made according to the type of the sheet 81 to be used by adding the material or thickness of the sheet 81 to the setting items of the heating data. Further, when the type of the sheet 81 is changed, the setting is changed simply by selecting the type of the sheet 81 to be used. Therefore, there is an advantage that the setting change does not require time compared to the conventional case. . Further, since the heating control device 1 can set the set temperature in an arbitrary range, there is an advantage that the number of the heating data to be set in advance can be minimized.

1 Heating control device (present invention)
1y Heating control device (conventional)
DESCRIPTION OF SYMBOLS 2 Control part 3 Memory | storage part 4 Temperature converter 5 Voltage application part 6 Input means 10 Packaging machine 11 Vertical seal unit 12 Heater block 12a Heater 13 Temperature sensor 15 Horizontal seal unit 16 Heater block 16a Heater 16b Heater 17 Temperature sensor 80 Original film 81 sheets 82 bags 90 parts

Claims (3)

Heater that can be heated by energization to weld the sheet, temperature sensor that can output voltage according to its own temperature, heater block that incorporates both the heater and the temperature sensor, and the voltage of the temperature sensor is converted to temperature In a packaging machine provided with a heating control device for energizing the heater based on the detected temperature,
Heating data in which energization time to the heater corresponding to an arbitrary set temperature and the set temperature is set in advance, a storage unit that sets the heating data for each set temperature and stores a plurality of heating data, and And a control unit that determines the heating data of the set temperature that matches the detected temperature and selects the energization time.   The heating control apparatus according to claim 1, wherein the heating data is preset for each type of the sheet to be used.   The heating control apparatus according to claim 1, wherein the set temperature can be set in an arbitrary range.

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