Heat sealing apparatus and control method.

Abstract

To provide a heat seal device capable of feedback controlling an impulse heater.SOLUTION: A heat seal device 1 includes: a heat bar including a mounting surface; a stretchable sheet member having a seal surface covering at least a part of the mounting surface; an impulse heater placed between the mounting surface and the seal surface; and a temperature sensor arranged adjacently to the impulse heater between the mounting surface and seal surface.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present invention relates to a heat sealing device and a method for controlling a heat sealing device. [Background technology]

[0002] Patent Document 1 discloses a heat sealing device that includes a seal bar and a controller that controls a heater. In the heat sealing device, the seal bar has a rod-shaped main body with a sealing surface, a heater provided inside the main body, and a temperature sensor provided inside the main body between the seal surface and the heater. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2018-103995 Summary of the Invention [Problem to be solved by the invention]

[0004] However, in the heat sealing device, when an impulse heater placed on the sealing surface is used instead of a built-in heater, the response time of the impulse heater is fast, so the temperature sensor built into the main body may not be able to feedback control the impulse heater.

[0005] The present disclosure provides a heat sealing device capable of feedback-controlling an impulse heater and a method for controlling a heat sealing device. [Means for solving the problem]

[0006] A heat sealing device according to one aspect of the present disclosure comprises: a heat bar including a mounting surface; a stretchable sheet member having a sealing surface that covers at least a portion of the mounting surface in a first direction intersecting the mounting surface; an impulse heater disposed between the mounting surface and the sealing surface; a temperature sensor disposed adjacent to the impulse heater between the mounting surface and the sealing surface; Equipped with.

[0007] A control method according to one aspect of the present disclosure includes: a first seal member having a sealing surface; a second sealing member capable of sandwiching and heat-sealing the packaging material together with the first sealing member; an impulse heater for heating the sealing surface; a temperature sensor for detecting the temperature of the impulse heater; a control device that controls the impulse heater so that the temperature detected by the temperature sensor becomes a target temperature; Equipped with The first seal member is a heat bar including a mounting surface; a stretchable sheet member having the sealing surface covering at least a portion of the mounting surface in a first direction intersecting the mounting surface; and the impulse heater is disposed between the mounting surface and the sealing surface; 1. A method of controlling a heat sealing device, wherein the temperature sensor is disposed adjacent to the impulse heater between the mounting surface and the sealing surface, comprising: start control of the impulse heater in synchronization with a start timing of a heat sealing operation in which the first seal member and the second seal member are brought close to each other to heat-seal the packaging material held by the first seal member and the second seal member; Control of the impulse heater is stopped in synchronization with the end timing of the heat sealing operation in which the first seal member and the second seal member, which are holding the heat-sealed packaging material, are separated. [Effects of the Invention]

[0008] According to the heat sealing device of the above aspect, it is possible to realize a heat sealing device capable of feedback-controlling the impulse heater.

[0009] According to the control method of the above aspect, it is possible to realize a control method for a heat sealing device that is capable of feedback-controlling an impulse heater. [Brief explanation of the drawings]

[0010] [Figure 1] FIG. 1 is a block diagram illustrating a heat sealing device according to one embodiment of the present disclosure. [Figure 2] FIG. 2 is a perspective view showing a first sealing member of the heat-sealing device of FIG. 1. [Figure 3] FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. [Figure 4] 3 is an exploded perspective view showing a temperature sensor of the first seal member of FIG. 2. FIG. [Figure 5] 3 is a flowchart for explaining the heat sealing process of the heat sealing device of FIG. 1. [Figure 6] FIG. 2 is a perspective view showing a modified example of the heat sealing device of FIG. [Figure 7] 12 is a cross-sectional view taken along line XII-XII in FIG. 6. [Figure 8] 1 is a first graph showing the relationship between the temperature of the impulse heater of the heat sealing device of Example 1 and time. [Figure 9] 10 is a first graph showing the relationship between the temperature of the impulse heater and time in the heat sealing device of the comparative example. [Figure 10] 10 is a second graph showing the relationship between the temperature of the impulse heater of the heat sealing device of Example 1 and time. [Figure 11] 10 is a second graph showing the relationship between the temperature of the impulse heater and time in the heat sealing device of the comparative example. [Figure 12] 10 is a graph showing the relationship between the temperature of the impulse heater of the heat sealing device of Example 2 and time. DETAILED DESCRIPTION OF THE INVENTION

[0011] An example of the present disclosure will be described below with reference to the accompanying drawings. Note that the following description is merely illustrative in nature and is not intended to limit the present disclosure, its applications, or its uses. Furthermore, the drawings are schematic, and the ratios of the dimensions and the like do not necessarily correspond to reality.

[0012] 1, a heat sealing device 1 according to an embodiment of the present disclosure includes a first seal member 10, a second seal member 20, a drive device 30 that drives the second seal member 20, and a control device 40. The first seal member 10 has an impulse heater 13 and a temperature sensor 14. The second seal member 20 is configured to be movable toward and away from the first seal member 10 by the drive device 30. The control device 40 feedback-controls the impulse heater 13 based on the detection result of the temperature sensor 14, and also controls the drive device 30.

[0013] As shown in FIGS. 2 and 3, the first seal member 10 has a heat bar 11 and a sheet member 12 in addition to an impulse heater 13 and a temperature sensor 14.

[0014] The heat bar 11 is, for example, a metal rod-shaped member having a mounting surface 111. An impulse heater 13 and a temperature sensor 14 are attached to the mounting surface 111 via a joining member 15. The joining member 15 is made of, for example, a glass tape that is insulating and has heat resistance of 100 to 300 degrees Celsius or higher.

[0015] The sheet member 12 has a sealing surface 121 that covers at least a portion of the mounting surface 111 of the heat bar 11 in a first direction (e.g., the Z direction in FIGS. 2 and 3) that intersects with the mounting surface 111. In this embodiment, the sheet member 12 is made of a material (e.g., silicone rubber, fluororubber, and glass fiber) that is stretchable and has heat resistance of 100 to 300 degrees Celsius or higher. For example, if the sheet member 12 needs to function as a buffer material to prevent disconnection of the temperature sensor 14, the sheet member 12 preferably has a thickness of 0.5 mm or more. As shown in FIG. 3, the sheet member 12 covers the entire mounting surface 111 of the heat bar 11 and a portion of the side surface 112 that intersects with the mounting surface 111.

[0016] The impulse heater 13 is disposed between the mounting surface 111 of the heat bar 11 and the sealing surface 121 of the sheet member 12. In this embodiment, the impulse heater 13 is disposed in the center of the mounting surface 111 and heats the sealing surface 121 of the sheet member 12.

[0017] The temperature sensor 14 is disposed adjacent to the impulse heater 13 between the mounting surface 111 of the heat bar 11 and the sealing surface 121 of the sheet member 12. In this embodiment, the temperature sensor 14 is configured as a thermocouple or a resistance thermometer and is disposed adjacent to and in contact with the impulse heater 13 at the edge of the mounting surface 111 in a direction along the mounting surface 111. As shown in FIG. 4, the temperature sensor 14 includes a sensor head 141 (e.g., a thermocouple junction) and an insulating member 142 that covers the sensor head 141. The insulating member 142 is formed of a material (e.g., polyamide, polyimide, polyamideimide, and glass fiber) that has a heat resistance of 100 to 300 degrees Celsius or higher and has a film or sheet shape. In this embodiment, the sensor head 141 is sandwiched and covered between two insulating members 142. If the temperature sensor 14 is configured as a thermocouple, it is preferably configured as a strip-shaped thermocouple, which has higher strength and durability than a wire-shaped thermocouple.

[0018] The second seal member 20 is, for example, a rod-shaped metal member, and has an opposing surface 21 that faces the seal surface 121 of the first seal member 10 in the first direction Z, as shown in FIG.

[0019] As an example, the drive device 30 is configured to be able to move the second seal member 20 so that the opposing surface 21 can approach and contact the seal surface 121 along the first direction Z and so that the opposing surface 21 can move away from the seal surface 121 along the first direction Z.

[0020] The control device 40, for example, has a CPU 41 that performs calculations, a storage unit 42, and a communication unit 43, and controls the impulse heater 13 so that the temperature of the sealing surface 121 detected by the temperature sensor 14 reaches a target temperature. The storage unit 42 is composed of, for example, ROM and RAM, and stores programs and data necessary for controlling the impulse heater 13. The communication unit 43 inputs and outputs information to and from an external device connected wirelessly or via a wire, for example. The external device includes the first seal member 10 and the drive device 30.

[0021] When the heat sealing device 1 performs the "heat sealing operation" of heat-sealing the packaging material 100, the packaging material 100 is placed between the sealing surface 121 of the first sealing member 10 and the opposing surface 21 of the second sealing member 20, as shown in Figure 3. Once the packaging material 100 is placed between the sealing surface 121 and the opposing surface 21, the second sealing member 20 is moved toward the first sealing member 10, sandwiching and holding the packaging material 100 between the sealing surface 121 and the opposing surface 21. With the packaging material 100 held between the sealing surface 121 and the opposing surface 21, the impulse heater 13 is turned on to heat the sealing surface 121, thereby heat-sealing the packaging material 100.

[0022] In this embodiment, the time when the second seal member 20 starts to approach the first seal member 10 is defined as the "start timing of the thermal sealing operation," and the time when the second seal member 20 starts to move away from the first seal member 10 after a predetermined time has elapsed since the "start timing of the thermal sealing operation" is defined as the "end timing of the thermal sealing operation." The time elapsed from the start timing of the thermal sealing operation is measured, for example, by the control device 40.

[0023] The control device 40 starts controlling the impulse heater 13 in synchronization with the start timing of the heat sealing operation, and stops controlling the impulse heater 13 in synchronization with the end timing of the heat sealing operation. When the control of the impulse heater 13 is stopped in synchronization with the end timing of the heat sealing operation, the impulse heater 13 is kept in the off state until the start timing of the next heat sealing operation.

[0024] In the heat sealing operation, the impulse heater 13 is periodically switched from an off state to an on state, and then from the on state to an off state. For example, when the impulse heater 13 is switched from the on state to the off state in the first cycle, the control device 40 keeps the impulse heater in the off state until the transition to the second cycle immediately after the first cycle.

[0025] An example of heat sealing processing using the heat sealing device 1 will now be described with reference to Fig. 5. The heat sealing processing is realized, for example, by the CPU 41 executing a predetermined program.

[0026] 5, the control device 40 determines whether or not the timing to start the heat sealing operation has arrived (step S1). Step S1 is repeated until it is determined that the timing to start the heat sealing operation has arrived.

[0027] When it is determined that the timing for starting the heat sealing operation has been reached, the control device 40 corrects the target temperature (step S2). The control device 40 corrects the target temperature based on the initial temperature, which is the temperature of the sealing surface 121 detected by the temperature sensor 14 at the timing for starting the heat sealing operation. Specifically, the control device 40 calculates a correction value by multiplying the difference between the initial temperature and a predetermined reference initial temperature by a constant, and adds the calculated correction value to the target temperature. The control device 40 sets the "target temperature + correction value" as a new target temperature.

[0028] The reference initial temperature is, for example, the temperature of the sealing surface 121 measured in advance at the start timing of the heat sealing operation and stored in the storage unit 42. The constant is, for example, an arbitrary integer that is set in advance depending on the design of the heat sealing device 1, etc.

[0029] After the target temperature correction, the control device 40 performs feedback control (for example, ON-OFF control or PID control) of the impulse heater 13 (step S3). When the impulse heater 13 is controlled by PID control, the control device 40 resets the integral value to zero in synchronization with the start timing of the heat sealing operation.

[0030] When the feedback control of the impulse heater 13 is started, the control device 40 determines whether or not the temperature detected by the temperature sensor 14 has reached the target temperature (step S4). If it is determined that the temperature detected by the temperature sensor 14 has not reached the target temperature, the process returns to step S3, and the impulse heater 13 is feedback-controlled.

[0031] If it is determined that the temperature detected by the temperature sensor 14 has reached the target temperature, the control device 40 stops control of the impulse heater 13 (step S5) and determines whether or not the heat sealing process is to end (step S6). If it is determined that the heat sealing process is to end, the control device 40 ends the heat sealing process. If it is determined that the heat sealing process is not to end, the process returns to step S1, and with the control of the impulse heater 13 stopped, it is determined whether or not the start timing for the heat sealing operation has arrived.

[0032] The heat sealing device 1 can provide the following effects.

[0033] The heat sealing device 1 includes a heat bar 11, a stretchable sheet member 12, an impulse heater 13, and a temperature sensor 14. The heat bar 11 includes a mounting surface 111. The sheet member 12 has a sealing surface 121 that covers at least a portion of the mounting surface 111 in a first direction intersecting the mounting surface 111. The impulse heater 13 is disposed between the mounting surface 111 and the sealing surface 121. The temperature sensor 14 is disposed adjacent to the impulse heater 13 between the mounting surface 111 and the sealing surface 121. This configuration improves the responsiveness of the temperature sensor 14. As a result, a heat sealing device 1 capable of feedback-controlling the impulse heater 13 can be realized. Furthermore, because the sheet member 12 is stretchable, disconnection of the temperature sensor 14 can be suppressed.

[0034] The heat-sealing device 1 can optionally employ one or more of the following configurations. That is, if one or more of the following configurations are included in the above-described embodiment, they can be optionally deleted, and if they are not included in the above-described embodiment, they can be optionally added. By employing such a configuration, it is possible to more reliably realize a heat-sealing device 1 capable of feedback-controlling the impulse heater 13.

[0035] The impulse heater 13 is attached to the attachment surface 111 via a joining member 15 having heat resistance and insulating properties.

[0036] The temperature sensor 14 is composed of a thermocouple or a resistance temperature detector.

[0037] The sheet member 12 is made of any one of silicone rubber, fluororubber, and glass fiber.

[0038] The temperature sensor 14 includes a sensor head 141 and a film- or sheet-like insulating member 142 that covers the sensor head 141. The insulating member 142 insulates the sensor head 141 from the heat bar 11.

[0039] The insulating member 142 is made of any one of polyamide, polyimide, polyamideimide, and glass fiber.

[0040] The heat sealing device (1) is provided with a control device (40) that feedback controls the impulse heater (13) based on the detection result of the temperature sensor (14).

[0041] The temperature sensor 14 is composed of a strip-shaped thermocouple.

[0042] The control method of the heat sealing device 1 can achieve the following effects.

[0043] The heat sealing device 1 includes a first sealing member 10, a second sealing member 20, an impulse heater 13, a temperature sensor 14, and a control device 40. The first sealing member 10 has a sealing surface 121. The second sealing member 20 is configured to sandwich and heat-seal a packaging material 100 together with the first sealing member 10. The impulse heater 13 heats the sealing surface 121. The temperature sensor 14 detects the temperature of the impulse heater 13. The temperature sensor 14 controls the impulse heater 13 so that the temperature detected by the temperature sensor 14 becomes a target temperature. The first sealing member 10 includes a heat bar 11 including a mounting surface 111 and a stretchable sheet member 12 having a sealing surface 121 that covers at least a portion of the mounting surface 111 in a first direction intersecting the mounting surface 111. The impulse heater is disposed between the mounting surface 111 and the sealing surface 121, and the temperature sensor 14 is disposed adjacent to the impulse heater 13 between the mounting surface 111 and the sealing surface 121. In the heat sealing device 1 configured as described above, control of the impulse heater 13 is started in synchronization with the start of the heat sealing operation, which brings the first seal member 10 and the second seal member 20 closer together and heat-seals the packaging material 100 held by the first seal member 10 and the second seal member 20. Control of the impulse heater 13 is stopped in synchronization with the end of the heat sealing operation, which separates the first seal member 10 and the second seal member 20 while holding the heat-sealed packaging material 100. This configuration can improve the responsiveness of the temperature sensor 14 and shorten the sampling period of the temperature sensor 14. As a result, a control method for the heat sealing device 1 can be realized that enables feedback control of the impulse heater 13, which has a fast response time.

[0044] The control method for the heat-sealing device 1 can optionally employ one or more of the following configurations. That is, if one or more of the following configurations are included in the above-described embodiment, they can be optionally deleted, and if they are not included in the above-described embodiment, they can be optionally added. By employing such a configuration, it is possible to more reliably realize a control method for the heat-sealing device 1 that is capable of feedback-controlling the impulse heater 13.

[0045] The impulse heater 13 is controlled by ON-OFF control or PID control.

[0046] When the impulse heater 13 is controlled by PID control, the integral value is reset to zero in synchronization with the start timing of the heat sealing operation.

[0047] The target temperature is corrected based on the initial temperature, which is the temperature of the sealing surface 121 detected by the temperature sensor 14 at the start timing of the heat sealing operation.

[0048] The target temperature is corrected by adding a correction value calculated by multiplying the difference between the initial temperature and a predetermined reference initial temperature by a constant to the target temperature.

[0049] In the heat sealing operation, when the control of transitioning the impulse heater 13 from the off state to the on state and then from the on state to the off state is performed periodically, when the impulse heater 13 is switched from the on state to the off state in the first cycle, the impulse heater 13 is maintained in the off state until the transition to the second cycle immediately following the first cycle.

[0050] The heat sealing device 1 can also be configured as follows.

[0051] The heat bar 11 and the impulse heater 13 can be of any shape and size depending on the design of the heat sealing device 1, etc.

[0052] The sheet member 12 is only required to cover at least a part of the mounting surface 111, and is preferably configured to cover the entire impulse heater 13.

[0053] The temperature sensor 14 can be positioned anywhere on the edge of the mounting surface 111 .

[0054] The temperature sensor 14 is not limited to being disposed in contact with the impulse heater 13, and may be disposed with a gap between it and the impulse heater 13.

[0055] The temperature sensor 14 is not limited to being disposed adjacent to the impulse heater 13 at the edge of the mounting surface 111 in the direction along the mounting surface 111. For example, the temperature sensor 14 may be disposed so as to be sandwiched between the impulse heater 13 and the sheet member 12 in the first direction Z, as shown in FIGS. 6 and 7 . In other words, the temperature sensor 14 may be disposed adjacent to the impulse heater 13 in the first direction Z between the impulse heater 13 and the sealing surface 121. As an example, the temperature sensor 14 is in contact with the surface of the impulse heater 13 opposite in the first direction Z to the surface facing the mounting surface 111, and the surface of the sheet member 12 opposite in the first direction Z to the sealing surface 121. This configuration further improves the responsiveness of the temperature sensor 14.

[0056] The first seal member 10 can also be configured to be able to approach and separate from the second seal member 20. In this case, the second seal member 20 may be configured to be able to approach and separate from the first seal member 10, or may be configured to be unable to approach and separate from the first seal member 10.

[0057] The second seal member 20 may be configured in the same manner as the first seal member 10. That is, the second seal member 20 may be configured by a heat bar 11, a sheet member 12, an impulse heater 13, and a temperature sensor 14.

[0058] The first seal member 10 may have a cutting blade on the sealing surface 121 that can cut the packaging material 100. Similarly, the second seal member 20 may have a cutting blade on the opposing surface 21 that can cut the packaging material 100.

[0059] Various embodiments of the present disclosure have been described in detail above with reference to the drawings. Finally, various aspects of the present disclosure will be described. Note that in the following description, reference numerals will also be used as examples.

[0060] The heat sealing device 1 of the first aspect of the present disclosure includes: a heat bar 11 including a mounting surface 111; a stretchable sheet member (12) having a sealing surface (121) that covers at least a portion of the mounting surface (111) in a first direction intersecting the mounting surface (111); an impulse heater 13 disposed between the mounting surface 111 and the sealing surface 121; a temperature sensor 14 disposed adjacent to the impulse heater 13 between the mounting surface 111 and the sealing surface 121; Equipped with.

[0061] The heat sealing device 1 according to the second aspect of the present disclosure includes: The temperature sensor 14 is sandwiched between the impulse heater 13 and the sheet member 12 in the first direction.

[0062] The heat sealing device 1 of the third aspect of the present disclosure is The impulse heater 13 is attached to the attachment surface 111 via a joining member having heat resistance and insulating properties.

[0063] The heat sealing device 1 according to the fourth aspect of the present disclosure includes: The temperature sensor 14 is composed of a thermocouple or a resistance temperature detector.

[0064] The heat sealing device 1 of the fifth aspect of the present disclosure is The sheet member 12 is made of any one of silicone rubber, fluororubber, and glass fiber.

[0065] The heat sealing device 1 according to the sixth aspect of the present disclosure is the temperature sensor 14 includes a sensor head 141 and a film-like or sheet-like insulating member 142 that covers the sensor head 141; The insulating member 142 insulates the sensor head 141 from the heat bar 11 .

[0066] The heat sealing device 1 according to the seventh aspect of the present disclosure is The insulating member 142 is made of any one of polyamide, polyimide, polyamideimide, and glass fiber.

[0067] The heat sealing device 1 according to the eighth aspect of the present disclosure is The apparatus includes a control device 40 that feedback controls the impulse heater 13 based on the detection result of the temperature sensor 14 .

[0068] The heat sealing device 1 of the ninth aspect of the present disclosure is The temperature sensor 14 is composed of a strip-shaped thermocouple.

[0069] A method for controlling a heat sealing device according to a tenth aspect of the present disclosure includes: a first seal member 10 having a seal surface 121; a second seal member 20 that can sandwich and heat seal a packaging material together with the first seal member 10; an impulse heater 13 for heating the sealing surface 121; a temperature sensor 14 for detecting the temperature of the impulse heater 13; a control device (40) for controlling the impulse heater (13) so that the temperature detected by the temperature sensor (14) becomes a target temperature; Equipped with The first seal member 10 is a heat bar 11 including a mounting surface 111; an elastic sheet member (12) having the sealing surface (121) covering at least a part of the mounting surface (111) in a first direction intersecting the mounting surface (111); and the impulse heater 13 is disposed between the mounting surface 111 and the sealing surface 121; A method for controlling a heat sealing device (1), wherein the temperature sensor (14) is disposed adjacent to the impulse heater (13) between the mounting surface (111) and the sealing surface (121), comprising: control of the impulse heater 13 is started in synchronization with the start timing of a heat sealing operation in which the first seal member 10 and the second seal member 20 are brought close to each other and the packaging material held by the first seal member 10 and the second seal member 20 is heat-sealed; Control of the impulse heater 13 is stopped in synchronization with the end timing of the heat sealing operation in which the first seal member 10 and the second seal member 20 holding the heat-sealed packaging material are separated.

[0070] A method for controlling a heat sealing device according to an eleventh aspect of the present disclosure includes: The impulse heater 13 is controlled by ON-OFF control or PID control.

[0071] A method for controlling a heat sealing device according to a twelfth aspect of the present disclosure includes: When the impulse heater 13 is controlled by PID control, the integral value is reset to zero in synchronization with the start timing of the heat sealing operation.

[0072] A method for controlling a heat sealing device according to a thirteenth aspect of the present disclosure includes: The target temperature is corrected based on the initial temperature, which is the temperature of the sealing surface 121 detected by the temperature sensor 14 at the start timing of the heat sealing operation.

[0073] A method for controlling a heat sealing device according to a fourteenth aspect of the present disclosure includes: The target temperature is corrected by adding a correction value calculated by multiplying the difference between the initial temperature and a predetermined reference initial temperature by a constant to the target temperature.

[0074] A method for controlling a heat sealing device according to a fifteenth aspect of the present disclosure includes: In the heat sealing operation, when the control of the impulse heater 13 is periodically performed to transition from an off state to an on state and then from an on state to an off state, When the impulse heater 13 is switched from an on state to an off state in the first period, the impulse heater 13 is maintained in the off state until the second period immediately follows the first period.

[0075] Any of the various embodiments or modifications described above can be combined appropriately to achieve the effects of each. In addition, combinations of embodiments, combinations of examples, or combinations of embodiments and examples are possible, and combinations of features from different embodiments or examples are also possible.

[0076] Although the present disclosure has been fully described in connection with the preferred embodiments with reference to the accompanying drawings, various changes and modifications will be apparent to those skilled in the art, and such changes and modifications are to be understood as being included within the scope of the present disclosure as defined by the appended claims unless they depart therefrom. [Example]

[0077] The present disclosure will be explained in more detail below by showing examples, but the present disclosure is not limited to these examples in any way.

[0078] [Example 1] The temperature of the impulse heater 13 was measured when the heat sealing device 1 was started and the heat sealing operation was performed using the feedback control of the present disclosure. Figure 8 shows the temperature of the impulse heater 13 when the heat sealing operation was started upon startup of the heat sealing device 1, and Figure 10 shows the temperature of the impulse heater 13 when the heat sealing operation, which had been temporarily suspended after startup of the heat sealing device 1, was resumed.

[0079] (Conditions) A heat sealing device 1 equipped with the first sealing member 10 shown in FIGS. 2 and 3 was used. The target temperature was set to 123 degrees Celsius and no target temperature correction was performed. A thermocouple was used as the temperature sensor. The impulse heater 13 was controlled by ON-OFF control.

[0080] [Comparative Example] The temperature of the impulse heater 13 was measured when the heat sealing device 1 was started and the heat sealing operation was performed by time control without feedback control. Figure 9 shows the temperature of the impulse heater 13 when the heat sealing operation was started when the heat sealing device 1 was started, and Figure 11 shows the temperature of the impulse heater 13 when the heat sealing operation, which had been temporarily suspended after the heat sealing device 1 was started, was resumed.

[0081] (Conditions) A heat sealing device 1 equipped with the first sealing member 10 shown in FIGS. 2 and 3 was used. The target temperature was set to 123 degrees Celsius and no target temperature correction was performed. A thermocouple was used as the temperature sensor. The impulse heater 13 was controlled by time control, which repeatedly turned the impulse heater 13 on for 1 second and then off for 19 seconds.

[0082] (result) 8 and 9, in Example 1, the heat sealing operation started earlier than in the comparative example when the heat sealing device 1 was started. As shown in Figures 8 to 11, in Example 1, when the heat sealing operation started at and after the start of the heat sealing device 1, the peak temperature stabilized earlier than in the comparative example. In other words, it was found that by using the heat sealing device 1 and the control method for the heat sealing device 1 of the present disclosure, the temperature control of the impulse heater 13, which has a fast response time, can be performed stably.

[0083] [Example 2] The temperature of the impulse heater 13 was measured when the target temperature was corrected and the heat sealing operation was performed using the feedback control of the present disclosure. Figure 12 shows the temperature of the impulse heater 13 when the heat sealing operation, which was temporarily suspended after the heat sealing device 1 was started, was resumed.

[0084] (Conditions) A heat sealing device 1 equipped with the first sealing member 10 shown in FIGS. 2 and 3 was used. The target temperature was corrected based on the correction value determined based on the following formula: Correction value = -0.1 x (initial temperature - reference initial temperature) The reference initial temperature was set to 100 degrees Celsius. A thermocouple was used as the temperature sensor. The impulse heater 13 was controlled by ON-OFF control.

[0085] (result) In Fig. 12, the temperature of the impulse heater 13 in Example 1 is shown by a dotted line. As shown in Fig. 12, the peak temperature immediately after the start of the heat sealing operation in Example 2 was more stable than in Example 1. In other words, it was found that the variation in peak temperature could be improved by correcting the target temperature. [Industrial Applicability]

[0086] The heat sealing device and control method of the present disclosure can be applied to, for example, machines that manufacture bags for packaging food or medicine. [Explanation of symbols]

[0087] 1. Heat sealing device 10 First seal member 11 Heat Bar 111 Mounting surface 112 Side 12 Sheet material 121 sealing surface 13 Impulse heater 14 Temperature Sensor 141 Sensor head 142 Insulating materials 15 Joint materials 20 second seal member 30 Drive unit 40 Control device 41 CPU 42 Storage section 43 Communications Department 100 Packaging material

Claims

1. a heat bar including a mounting surface; a stretchable sheet member having a sealing surface that covers at least a portion of the mounting surface in a first direction intersecting the mounting surface; an impulse heater disposed between the mounting surface and the sealing surface; a temperature sensor disposed adjacent to the impulse heater in a direction along the mounting surface between the mounting surface and the sealing surface; A heat sealing device comprising:

2. The heat sealing device according to claim 1 , wherein the temperature sensor is sandwiched between the impulse heater and the sheet member in the first direction.

3. 3. The heat sealing device according to claim 1, wherein the impulse heater is attached to the attachment surface via a joining member having heat resistance and insulating properties.

4. 4. The heat-sealing device according to claim 1, wherein the temperature sensor is a thermocouple or a resistance temperature detector.

5. 5. The heat-sealing device according to claim 1, wherein the sheet member is made of any one of silicone rubber, fluororubber, and glass fiber.

6. the temperature sensor includes a sensor head and a film-like or sheet-like insulating member that covers the sensor head, 6. The heat-sealing device according to claim 1, wherein the insulating member insulates the sensor head from the heat bar.

7. 7. The heat sealing device according to claim 6, wherein the insulating member is made of any one of polyamide, polyimide, polyamideimide, and glass fiber.

8. 8. The heat sealing device according to claim 1, further comprising a control device that feedback-controls the impulse heater based on the detection result of the temperature sensor.

9. 9. The heat sealing device according to claim 1, wherein the temperature sensor is a strip-shaped thermocouple.

10. a first seal member having a sealing surface; a second sealing member capable of sandwiching and heat-sealing a packaging material together with the first sealing member; an impulse heater for heating the sealing surface; a temperature sensor for detecting the temperature of the impulse heater; a control device that controls the impulse heater so that the temperature detected by the temperature sensor becomes a target temperature; Equipped with The first seal member is a heat bar including a mounting surface; a stretchable sheet member having the sealing surface covering at least a portion of the mounting surface in a first direction intersecting the mounting surface; and the impulse heater is disposed between the mounting surface and the sealing surface; A method for controlling a heat sealing device, wherein the temperature sensor is disposed adjacent to the impulse heater in a direction along the mounting surface between the mounting surface and the sealing surface, comprising: start control of the impulse heater in synchronization with a start timing of a heat sealing operation in which the first seal member and the second seal member are brought close to each other to heat-seal the packaging material held by the first seal member and the second seal member; a control method for stopping control of the impulse heater in synchronization with the end timing of the heat sealing operation in which the first sealing member and the second sealing member are separated while holding the heat-sealed packaging material.

11. The control method according to claim 10, wherein the impulse heater is controlled by ON-OFF control or PID control.

12. The control method according to claim 11, wherein, when the impulse heater is controlled by PID control, the integral value is reset to zero in synchronization with the start timing of the heat sealing operation.

13. 13. The control method according to claim 10, wherein the target temperature is corrected based on an initial temperature, which is the temperature of the sealing surface detected by the temperature sensor at a timing when the heat-sealing operation is started.

14. 14. The control method according to claim 13, wherein the target temperature is corrected by adding a correction value calculated by multiplying a difference between the initial temperature and a predetermined reference initial temperature by a constant to the target temperature.

15. In the heat sealing operation, when the control of transitioning the impulse heater from an off state to an on state and then from an on state to an off state is periodically performed, 15. The control method according to claim 10, wherein when the impulse heater is switched from an on state to an off state in a first period, the impulse heater is maintained in the off state until a transition to a second period immediately following the first period occurs.

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