Heat sealing device and control method

Abstract

The present application provides a heat sealing device and a control method, which can perform feedback control on a pulsating heater. The heat sealing device (1) comprises a heating rod including a mounting surface, a flexible sheet member having a sealing surface covering at least a portion of the mounting surface, a pulsating heater arranged between the mounting surface and the sealing surface, and a temperature sensor arranged adjacent to the pulsating heater between the mounting surface and the sealing surface.

Description

Technical Field

[0001] This invention relates to a heat-sealing device and a control method for the heat-sealing device. Background Technology

[0002] Patent Document 1 discloses a heat-sealing device having a sealing rod and a control unit for controlling a heater. In the heat-sealing device described above, the sealing rod has: a rod-shaped body having a sealing surface; a heater disposed inside the body; and a temperature sensor disposed inside the body between the sealing surface and the heater.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2018-103995

[0006] However, in the aforementioned heat-sealing device, when a pulsating heater disposed on the sealing surface is used instead of a built-in heater, the pulsating heater has a fast response time, so the temperature sensor built into the main body sometimes cannot provide feedback control for the pulsating heater. Summary of the Invention

[0007] This disclosure provides a heat sealing device and a control method for the heat sealing device capable of feedback control of a pulsating heater.

[0008] One aspect of the heat-sealing device disclosed herein includes: a heating rod including a mounting surface; a telescopic sheet member having a sealing surface covering at least a portion of the mounting surface in a first direction intersecting the mounting surface; a pulsating heater disposed between the mounting surface and the sealing surface; and a temperature sensor disposed adjacent to the pulsating heater between the mounting surface and the sealing surface.

[0009] One aspect of the control method disclosed herein is a control method for a heat-sealing device comprising: a first sealing member having a sealing surface; a second sealing member capable of heat-sealing packaging material together with the first sealing member; a pulse heater for heating the sealing surface; a temperature sensor for detecting the temperature of the pulse heater; and a control device for controlling the pulse heater in such a way that the temperature detected by the temperature sensor becomes a target temperature. The first sealing member comprises: a heating rod including a mounting surface; and a telescopic sheet member having at least [missing information - likely a slurry or a section] covering the mounting surface in a first direction intersecting the mounting surface. A portion of the sealing surface, the pulsating heater is disposed between the mounting surface and the sealing surface, the temperature sensor is disposed adjacent to the pulsating heater between the mounting surface and the sealing surface, in the control method, the control of the pulsating heater is started synchronously with the start timing of a heat-sealing action that brings the first sealing member and the second sealing member close together to heat-seal the packaging material held by the first sealing member and the second sealing member, and the control of the pulsating heater is stopped synchronously with the end timing of the heat-sealing action that separates the first sealing member and the second sealing member in the state of holding the heat-sealed packaging material.

[0010] The heat sealing device according to the above method can achieve the following: it can provide feedback control for the pulsating heater.

[0011] Based on the control method described above, a control method for a heat-sealing device can be achieved, enabling feedback control of the pulsating heater. Attached Figure Description

[0012] Figure 1 This is a block diagram illustrating a heat-sealing device according to one embodiment of the present disclosure.

[0013] Figure 2 It means Figure 1 A perspective view of the first sealing component of the heat sealing device.

[0014] Figure 3 It is along Figure 2 A cross-sectional view along line III-III.

[0015] Figure 4 It means Figure 2 An exploded perspective view of the temperature sensor of the first sealing component.

[0016] Figure 5 It is used for explanation Figure 1 A flowchart of the heat sealing process of the heat sealing device.

[0017] Figure 6 It means Figure 1 A perspective view of a modified example of a heat-sealing device.

[0018] Figure 7 It is along Figure 6 A sectional view of line XII-XII.

[0019] Figure 8 This is a first graph showing the relationship between the temperature and time of the pulsating heater of the heat-sealing device in Embodiment 1.

[0020] Figure 9 This is the first graph showing the relationship between temperature and time of the pulsating heater in the comparative example's heat-sealing device.

[0021] Figure 10 This is a second graph showing the relationship between the temperature and time of the pulsating heater of the heat-sealing device in Example 1.

[0022] Figure 11 This is the second graph showing the relationship between the temperature and time of the pulsating heater in the comparative example's heat-sealing device.

[0023] Figure 12 This is a graph showing the relationship between the temperature and time of the pulsating heater in the heat-sealing device of Example 2.

[0024] Label Explanation

[0025] 1. Heat sealing device

[0026] 10 First sealing component

[0027] 11 heating rods

[0028] 111 mounting surface

[0029] 112 side view

[0030] 12 parts

[0031] 121 Sealing Surface

[0032] 13. Impulse heater

[0033] 14 temperature sensors

[0034] 141 sensor heads

[0035] 142 Insulating Components

[0036] 15 Joining Components

[0037] 20 Second sealing component

[0038] 30 drive unit

[0039] 40 control devices

[0040] 41 CPU

[0041] 42 Storage Unit

[0042] 43 Ministry of Communications

[0043] 100 Packaging Materials Detailed Implementation

[0044] The following description illustrates an example of this disclosure with reference to the accompanying drawings. Furthermore, the following description is merely illustrative and is not intended to limit the scope of this disclosure, its applications, or its uses. Also, the drawings are schematic, and the proportions of the dimensions may not necessarily correspond to reality.

[0045] like Figure 1 As shown, a heat-sealing device 1 according to one embodiment of this disclosure includes a first sealing member 10, a second sealing member 20, a drive device 30 for driving the second sealing member 20, and a control device 40. The first sealing member 10 has a pulsating heater 13 and a temperature sensor 14. The second sealing member 20 is configured to approach and separate from the first sealing member 10 by means of the drive device 30. The control device 40 performs feedback control on the pulsating heater 13 based on the detection result of the temperature sensor 14, and controls the drive device 30.

[0046] like Figure 2 and Figure 3 As shown, in addition to the pulse heater 13 and the temperature sensor 14, the first sealing component 10 also includes a heating rod 11 and a sheet component 12.

[0047] As an example, the heating rod 11 is a metal rod-shaped component with a mounting surface 111. The pulsating heater 13 and the temperature sensor 14 are mounted on the mounting surface 111 via a connecting member 15. The connecting member 15 is, for example, made of a glass strip that has insulation and heat resistance of 100°C to 300°C or higher.

[0048] The plate component 12 has a first direction intersecting the mounting surface 111 of the heating rod 11 (e.g., Figure 2 and Figure 3 A sealing surface 121 covering at least a portion of the mounting surface 111 in the Z direction. In this embodiment, the sheet member 12 is made of a material (e.g., silicone rubber, fluororubber, and glass fiber) that has elasticity and heat resistance of 100°C to 300°C or more. For example, if it is necessary to function as a buffer to suppress wire breakage of the temperature sensor 14, the sheet member 12 preferably has a thickness of 0.5 mm or more. Figure 3 As shown, the plate component 12 covers the entire mounting surface 111 of the heating rod 11 and a portion of the side surface 112 that intersects with the mounting surface 111.

[0049] A pulse heater 13 is disposed between the mounting surface 111 of the heating rod 11 and the sealing surface 121 of the sheet component 12. In this embodiment, the pulse heater 13 is disposed at the center of the mounting surface 111 to heat the sealing surface 121 of the sheet component 12.

[0050] Temperature sensor 14 is disposed adjacent to pulse heater 13 between the mounting surface 111 of heating rod 11 and the sealing surface 121 of plate component 12. In this embodiment, temperature sensor 14 is composed of a thermocouple or a temperature-sensing resistor, and is disposed at the edge of mounting surface 111 in a state of adjacent contact with pulse heater 13 in the direction along mounting surface 111. Figure 4 As shown, the temperature sensor 14 includes a sensing head 141 (e.g., a thermocouple contact) and an insulating component 142 covering the sensing head 141. The insulating component 142 is made of a material (e.g., polyamide, polyimide, polyamide-imide, and glass fiber) having heat resistance of 100°C to 300°C or higher, and is in the form of a film or sheet. In this embodiment, the sensing head 141 is covered by two insulating components 142 sandwiched between them. When the temperature sensor 14 is made of a thermocouple, it is preferably made of a strip thermocouple, which has higher strength and durability than a wire thermocouple.

[0051] As an example, the second sealing component 20 is a metal rod-shaped component, such as... Figure 3 As shown, it has an opposing surface 21 that faces the sealing surface 121 of the first sealing member 10 in the first direction Z.

[0052] As an example, the drive device 30 is configured to enable the second sealing member 20 to move in such a way that the opposing surface 21 can approach and contact the sealing surface 121 along the first direction Z, and the opposing surface 21 can separate from the sealing surface 121 along the first direction Z.

[0053] As an example, the control device 40 includes a CPU 41 for performing calculations, a storage unit 42, and a communication unit 43 to control the pulsating heater 13 in a manner that makes the temperature of the sealing surface 121 detected by the temperature sensor 14 a target temperature. The storage unit 42, for example, is composed of ROM and RAM, storing the programs and data required for controlling the pulsating heater 13. The communication unit 43, for example, performs information input / output with an external device connected wirelessly or via a wired connection. The external device includes the first sealing member 10 and the drive unit 30.

[0054] In the heat-sealing device 1, when performing the "heat-sealing operation" to heat-seal the packaging material 100, such as Figure 3As shown, packaging material 100 is disposed between the sealing surface 121 of the first sealing member 10 and the opposing surface 21 of the second sealing member 20. When packaging material 100 is disposed between the sealing surface 121 and the opposing surface 21, the second sealing member 20 is brought closer to the first sealing member 10, and the packaging material 100 is held between the sealing surface 121 and the opposing surface 21. With the packaging material 100 held by the sealing surface 121 and the opposing surface 21, the pulse heater 13 is turned on to heat the sealing surface 121, thereby heat-sealing the packaging material 100.

[0055] In this embodiment, the start of the action of the second sealing member 20 approaching the first sealing member 10 is defined as the "start timing of the heat sealing operation," and the start of the action of the second sealing member 20 separating from the first sealing member 10 after a predetermined time has elapsed from the "start timing of the heat sealing operation" is defined as the "end timing of the heat sealing operation." The time elapsed from the start timing of the heat sealing operation is measured, for example, by the control device 40.

[0056] The control device 40 starts controlling the pulse heater 13 synchronously with the start timing of the heat sealing operation, and stops controlling the pulse heater 13 synchronously with the end timing of the heat sealing operation. When the control of the pulse heater 13 is stopped synchronously with the end timing of the heat sealing operation, the pulse heater 13 is kept in the off state until the start timing of the next heat sealing operation.

[0057] During the heat-sealing operation, the control is performed periodically as follows: after the pulsating heater 13 is switched from the off state to the on state, it is switched back from the on state to the off state. For example, if the pulsating heater 13 switches from the on state to the off state in the first cycle, the control device 40 maintains the pulsating heater in the off state until the second cycle after the first cycle.

[0058] Here, refer to Figure 5 An example of heat sealing processing using heat sealing device 1 will be described. The heat sealing process is implemented, for example, by CPU 41 executing a prescribed program.

[0059] like Figure 5 As shown, the control device 40 determines whether the start timing of the heat sealing operation has been reached (step S1). Step S1 is repeated until it is determined that the start timing of the heat sealing operation has been reached.

[0060] When the start timing of the heat sealing operation is determined to have 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 of the sealing surface 121 detected by the temperature sensor 14 at the start timing of the heat sealing operation. Specifically, the control device 40 calculates a correction value by multiplying the difference between the initial temperature and a preset 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 the new target temperature.

[0061] The reference initial temperature is, for example, the temperature of the sealing surface 121 at the start timing of the heat sealing operation, which is measured in advance and stored in the storage unit 42. The constant is, for example, an arbitrary integer preset according to the design of the heat sealing device 1, etc.

[0062] When the target temperature is corrected, the control device 40 performs feedback control on the pulsating heater 13 (e.g., ON-OFF control or PID control) (step S3). In the case of controlling the pulsating heater 13 by PID control, the control device 40 resets the integral value to zero in sync with the start timing of the heat sealing operation.

[0063] When feedback control of the pulsating heater 13 is initiated, the control device 40 determines whether 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 to perform feedback control on the pulsating heater 13.

[0064] If the temperature detected by temperature sensor 14 is determined to have reached the target temperature, control device 40 stops controlling the pulse heater 13 (step S5) and determines whether the heat sealing process is complete (step S6). If the heat sealing process is determined to be complete, control device 40 ends the heat sealing process. If the heat sealing process is determined not to be complete, it returns to step S1, and with the control of the pulse heater 13 stopped, it determines whether the start timing of the heat sealing operation has been reached.

[0065] The heat sealing device 1 can achieve the following effects.

[0066] The heat-sealing device 1 includes a heating rod 11, a telescopic sheet member 12, a pulsating heater 13, and a temperature sensor 14. The heating rod 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 pulsating heater 13 is disposed between the mounting surface 111 and the sealing surface 121. The temperature sensor 14 is disposed adjacent to the pulsating heater 13 between the mounting surface 111 and the sealing surface 121. This structure improves the responsiveness of the temperature sensor 14. As a result, the heat-sealing device 1 can be implemented such that feedback control of the pulsating heater 13 is possible. Furthermore, since the sheet member 12 is telescopic, wire breakage of the temperature sensor 14 can be suppressed.

[0067] The heat-sealing device 1 can arbitrarily employ any one or more of the structures shown below. That is, any one or more of the structures shown below can be arbitrarily deleted if included in the embodiment, and can be arbitrarily added if not included in the embodiment. By employing such a structure, the heat-sealing device 1 capable of feedback control of the pulsating heater 13 can be realized more reliably.

[0068] The pulsating heater 13 is mounted on the mounting surface 111 via a heat-resistant and insulating joint 15.

[0069] The temperature sensor 14 is composed of a thermocouple or a temperature-sensing resistor.

[0070] The sheet component 12 is made of any one of silicone rubber, fluororubber, and glass fiber.

[0071] The temperature sensor 14 includes a sensing head 141 and a film or sheet-like insulating component 142 covering the sensing head 141. The sensing head 141 is insulated from the heating rod 11 by means of the insulating component 142.

[0072] The insulating component 142 is made of any one of polyamide, polyimide, polyamide-imide, and glass fiber.

[0073] The heat sealing device 1 includes a control device 40, which performs feedback control on the pulsating heater 13 based on the detection results of the temperature sensor 14.

[0074] The temperature sensor 14 is composed of a strip thermocouple.

[0075] The control method of the heat sealing device 1 can achieve the following effects.

[0076] The heat-sealing device 1 includes a first sealing member 10, a second sealing member 20, a pulsating 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 heat-seal packaging material 100 together with the first sealing member 10. The pulsating heater 13 heats the sealing surface 121. The temperature sensor 14 detects the temperature of the pulsating heater 13. The temperature sensor 14 controls the pulsating heater 13 in such a way that the temperature detected by the temperature sensor 14 becomes a target temperature. The first sealing member 10 includes: a heating rod 11, which includes a mounting surface 111; and a telescopic sheet member 12, which has a sealing surface 121 covering at least a portion of the mounting surface 111 in a first direction intersecting the mounting surface 111. The pulsating heater is disposed between the mounting surface 111 and the sealing surface 121, and the temperature sensor 14 is disposed adjacent to the pulsating heater 13 between the mounting surface 111 and the sealing surface 121. In this heat-sealing device 1, the control of the pulse heater 13 begins synchronously with the start timing of the heat-sealing operation that brings the first sealing member 10 and the second sealing member 20 together to heat-seal the packaging material 100 held by the first sealing member 10 and the second sealing member 20. The control of the pulse heater 13 stops synchronously with the end timing of the heat-sealing operation that separates the first sealing member 10 and the second sealing member 20 while holding the heat-sealed packaging material 100. This structure improves the responsiveness of the temperature sensor 14 and speeds up its sampling cycle. As a result, a control method for the heat-sealing device 1, which enables feedback control of the pulse heater 13 with a fast response time, is realized.

[0077] The control method for the heat-sealing device 1 can arbitrarily employ any one or more of the structures shown below. That is, any one or more of the structures shown below can be arbitrarily deleted if included in the embodiment, and can be arbitrarily added if not included in the embodiment. By employing such a structure, the control method for the heat-sealing device 1, which enables feedback control of the pulsating heater 13, can be implemented more reliably.

[0078] The pulsating heater 13 is controlled by ON-OFF control or PID control.

[0079] When the pulsating heater 13 is controlled by PID control, the integral value is reset to zero in sync with the start timing of the heat sealing action.

[0080] The target temperature is corrected based on the initial temperature of the sealing surface 121 detected by the temperature sensor 14 at the start of the heat sealing operation.

[0081] The correction value, calculated by multiplying the difference between the initial temperature and the preset reference initial temperature by a constant, is added to the target temperature to correct the target temperature.

[0082] In the heat-sealing operation, when the control of the pulse heater 13 is periodically switched from the off state to the on state and then from the on state to the off state, when the pulse heater 13 switches from the on state to the off state in the first cycle, the pulse heater 13 is kept in the off state until the second cycle after the first cycle.

[0083] The heat sealing device 1 can also be configured as follows.

[0084] The heating rod 11 and the pulse heater 13 can be of any shape and size depending on the design of the heat sealing device 1.

[0085] The plate component 12 only needs to cover at least a portion of the mounting surface 111, and is preferably configured to cover the entire pulsating heater 13.

[0086] The temperature sensor 14 can be configured at any position on the edge of the mounting surface 111.

[0087] The temperature sensor 14 is not limited to being configured in contact with the pulse heater 13, but may also have a gap between it and the pulse heater 13.

[0088] The temperature sensor 14 is not limited to the case where it is disposed adjacent to the pulsating heater 13 at the edge of the mounting surface 111 in the direction along the mounting surface 111. For example, as Figure 6 and Figure 7 As shown, the temperature sensor 14 can also be configured to be sandwiched between the pulsating heater 13 and the plate member 12 in the first direction Z. In other words, the temperature sensor 14 can also be disposed adjacent to the pulsating heater 13 between the pulsating heater 13 and the sealing surface 121 in the first direction Z. As an example, the temperature sensor 14 contacts the surface of the pulsating heater 13 opposite to the surface of the mounting surface 111 in the first direction Z, and the surface of the plate member 12 opposite to the sealing surface 121 in the first direction Z. With this configuration, the responsiveness of the temperature sensor 14 can be further improved.

[0089] The first sealing member 10 may also be configured to be able to approach and separate from the second sealing member 20. In this case, the second sealing member 20 may be configured to be able to approach and separate from the first sealing member 10, or it may be configured not to approach and separate from the first sealing member 10.

[0090] The second sealing component 20 can also be constructed in the same way as the first sealing component 10. That is, the second sealing component 20 can also be constructed from the heating rod 11, the plate component 12, the pulse heater 13, and the temperature sensor 14.

[0091] The first sealing member 10 may also have a cutting edge on the sealing surface 121 capable of cutting the packaging material 100. Similarly, the second sealing member 20 may also have a cutting edge on the opposing surface 21 capable of cutting the packaging material 100.

[0092] The various embodiments of this disclosure have been described in detail above with reference to the accompanying drawings. Finally, various aspects of this disclosure will be described. Furthermore, in the following description, reference numerals will be used as examples.

[0093] The heat-sealing device 1 of the first aspect of this disclosure includes: a heating rod 11, which includes a mounting surface 111; a telescopic sheet member 12 having a sealing surface 121 covering at least a portion of the mounting surface 111 in a first direction intersecting the mounting surface 111; a pulsating heater 13 disposed between the mounting surface 111 and the sealing surface 121; and a temperature sensor 14 disposed adjacent to the pulsating heater 13 between the mounting surface 111 and the sealing surface 121.

[0094] In the second embodiment of the heat-sealing device 1 disclosed herein, the temperature sensor 14 is sandwiched between the pulsating heater 13 and the sheet component 12 in the first direction.

[0095] In the third embodiment of the heat-sealing device 1 disclosed herein, the pulsating heater 13 is mounted to the mounting surface 111 via a joining member having heat resistance and insulation.

[0096] In the fourth embodiment of the heat-sealing device 1 disclosed herein, the temperature sensor 14 is composed of a thermocouple or a temperature-sensing resistor.

[0097] In the fifth embodiment of the heat-sealing device 1 disclosed herein, the sheet component 12 is made of any one of silicone rubber, fluororubber, and glass fiber.

[0098] In the sixth embodiment of the heat sealing device 1 disclosed herein, the temperature sensor 14 includes a sensing head 141 and a membrane or sheet-like insulating component 142 covering the sensing head 141, wherein the sensing head 141 is insulated from the heating rod 11 by means of the insulating component 142.

[0099] In the seventh embodiment of the heat-sealing device 1 disclosed herein, the insulating component 142 is composed of any one of polyamide, polyimide, polyamide-imide, and glass fiber.

[0100] The eighth embodiment of the heat sealing device 1 disclosed herein includes a control device 40 that performs feedback control on the pulsating heater 13 based on the detection result of the temperature sensor 14.

[0101] In the ninth embodiment of the heat-sealing device 1 disclosed herein, the temperature sensor 14 is composed of a strip thermocouple.

[0102] In the control method of the heat-sealing device 1 of the tenth aspect of this disclosure, the heat-sealing device 1 includes: a first sealing member 10 having a sealing surface 121; a second sealing member 20 capable of heat-sealing packaging material together with the first sealing member 10; a pulsating heater 13 for heating the sealing surface 121; a temperature sensor 14 for detecting the temperature of the pulsating heater 13; and a control device 40 for controlling the pulsating heater 13 in such a way that the temperature detected by the temperature sensor 14 becomes a target temperature. The first sealing member 10 includes: a heating rod 11 including a mounting surface 111; and a telescopic sheet member 12 having a portion of the heating rod covering at least a portion of the mounting surface 111 in a first direction intersecting the mounting surface 111. A sealing surface 121, the pulse heater 13 is disposed between the mounting surface 111 and the sealing surface 121, and the temperature sensor 14 is disposed adjacent to the pulse heater 13 between the mounting surface 111 and the sealing surface 121. In the control method of the heat sealing device 1, the control of the pulse heater 13 is started synchronously with the start timing of the heat sealing operation that brings the first sealing member 10 and the second sealing member 20 close together to heat seal the packaging material held by the first sealing member 10 and the second sealing member 20, and the control of the pulse heater 13 is stopped synchronously with the end timing of the heat sealing operation that separates the first sealing member 10 and the second sealing member 20 in the state of holding the heat-sealed packaging material.

[0103] In the control method of the heat-sealing device of the eleventh aspect of this disclosure, the pulsating heater 13 is controlled by ON-OFF control or PID control.

[0104] In the control method of the heat sealing device of the twelfth aspect of this disclosure, when the pulsating heater 13 is controlled by PID control, the integral value is reset to zero synchronously with the start timing of the heat sealing operation.

[0105] In the control method of the heat sealing device of the thirteenth aspect of this disclosure, the target temperature is corrected based on the temperature of the sealing surface 121 detected by the temperature sensor 14 at the start timing of the heat sealing operation, i.e., the initial temperature.

[0106] In the control method of the heat-sealing device of the fourteenth aspect of this disclosure, the target temperature is corrected by adding a correction value calculated by multiplying the difference between the initial temperature and the preset reference initial temperature by a constant to the target temperature.

[0107] In the control method of the heat sealing device of the fifteenth aspect of this disclosure, during the heat sealing operation, when the control of the pulsating heater 13 is periodically switched from the off state to the on state and then from the on state to the off state, when the pulsating heater 13 switches from the on state to the off state in the first cycle, the pulsating heater 13 is maintained in the off state until the transition to the second cycle after the first cycle.

[0108] By appropriately combining any of the above-described embodiments or variations, their respective effects can be achieved. Furthermore, it is possible to combine embodiments with each other, or to combine different embodiments with different examples, and it is also possible to combine features from different embodiments with each other.

[0109] This disclosure has been fully described with reference to the accompanying drawings and preferred embodiments, but various modifications and alterations can be made by those skilled in the art. It should be understood that such modifications and alterations are included therein as long as they do not depart from the scope of this disclosure as defined in the appended claims.

[0110] [Example]

[0111] The following examples are provided for more detailed description, but the invention is not limited to any of the examples.

[0112] [Example 1]

[0113] The heat sealing device 1 is activated, and the temperature of the pulsating heater 13 is measured when the heat sealing action is performed through the feedback control of this disclosure. Figure 8 The figure shows the temperature of the pulsating heater 13 when the heat sealing operation begins upon activation of the heat sealing device 1. Figure 10 The temperature of the pulsating heater 13 is shown in the case where the heat sealing operation is temporarily interrupted and then resumes after the operation of the heat sealing device 1 has been started.

[0114] (Implementation conditions)

[0115] • Use with Figure 2 and Figure 3 The first sealing component 10 is a heat sealing device 1.

[0116] • Set the target temperature to 123 degrees Celsius without performing target temperature correction.

[0117] The temperature sensor uses a thermocouple.

[0118] • The pulsating heater 13 is controlled by ON-OFF control.

[0119] [Comparative Example]

[0120] Start the heat sealing device 1, without feedback control, and measure the temperature of the pulsating heater 13 when the heat sealing action is performed under time control. Figure 9 The figure shows the temperature of the pulsating heater 13 when the heat sealing operation begins upon activation of the heat sealing device 1. Figure 11 The temperature of the pulsating heater 13 is shown in the case where the heat sealing operation is temporarily interrupted and then resumes after the operation of the heat sealing device 1 has been started.

[0121] (Implementation conditions)

[0122] • Use with Figure 2 and Figure 3 The first sealing component 10 is a heat sealing device 1.

[0123] • Set the target temperature to 123 degrees Celsius without performing target temperature correction.

[0124] The temperature sensor uses a thermocouple.

[0125] • The pulse heater 13 is controlled by repeatedly turning it on for 1 second and then turning it off for 19 seconds.

[0126] (result)

[0127] like Figure 8 as well as Figure 9 As shown, in Example 1, compared to the comparative example, the heat sealing operation starts more quickly when the heat sealing device 1 is activated. Figures 8-11 As shown, in Embodiment 1, when the heat sealing device 1 is started and after startup, the peak temperature stabilizes more quickly when the heat sealing operation begins, compared to the comparative example. That is, it can be seen that by using the heat sealing device 1 and the control method of the heat sealing device 1 disclosed herein, the temperature control of the pulse heater 13 with a fast response time can be stably performed.

[0128] [Example 2]

[0129] The temperature of the pulsating heater 13 is measured when a heat-sealing operation is performed under feedback control according to this disclosure after correction to the target temperature. The temperature of the pulsating heater 13 is measured when the heat-sealing operation, which was temporarily interrupted, resumes after the heat-sealing device 1 has been activated. Figure 12 As shown.

[0130] (Implementation conditions)

[0131] • Use with Figure 2 and Figure 3 The first sealing component 10 is a heat sealing device 1.

[0132] • Correct the target temperature based on the correction value determined by the following formula.

[0133] Correction value = -0.1 × (initial temperature - reference initial temperature)

[0134] • Set the baseline initial temperature to 100 degrees Celsius.

[0135] The temperature sensor uses a thermocouple.

[0136] • The pulsating heater 13 is controlled by ON-OFF control.

[0137] (result)

[0138] exist Figure 12 In the diagram, the temperature of the pulsating heater 13 in Example 1 is represented by a dashed line. Figure 12 As shown, in Example 2, the peak temperature after the initial heat sealing action is stable compared to Example 1. That is, it can be seen that by correcting the target temperature, the deviation of the peak temperature can be improved.

[0139] [Industry availability]

[0140] The heat-sealing device and control method disclosed herein can be applied, for example, to equipment for manufacturing bags for packaging food or pharmaceuticals.

Claims

1. A heat-sealing device, comprising: A heating rod, including a mounting surface; A retractable sheet component having a sealing surface that covers at least a portion of the mounting surface in a first direction intersecting the mounting surface; A pulsating heater is disposed between the mounting surface and the sealing surface; as well as A temperature sensor is disposed adjacent to the pulsating heater between the mounting surface and the sealing surface in a direction along the mounting surface.

2. The heat-sealing device according to claim 1, wherein, The sheet component functions as a buffer material to suppress wire breakage in the temperature sensor.

3. The heat-sealing device according to claim 1 or 2, wherein, The pulsating heater is mounted on the mounting surface via a heat-resistant and insulating joint component.

4. The heat-sealing device according to claim 1 or 2, wherein, The temperature sensor is composed of a thermocouple or a temperature-sensing resistor.

5. The heat-sealing device according to claim 1 or 2, wherein, The sheet component is made of either silicone rubber or fluororubber.

6. The heat-sealing device according to claim 1 or 2, wherein, The temperature sensor includes a sensing head and a film or sheet-like insulating component covering the sensing head. The sensing head and the heating rod are insulated from each other by means of the insulating component.

7. The heat-sealing device according to claim 6, wherein, The insulating component is made of any one of polyamide, polyimide, polyamide-imide, and glass fiber.

8. The heat-sealing device according to claim 1 or 2, wherein, The heat-sealing device includes a control device that performs feedback control on the pulsating heater based on the detection results of the temperature sensor.

9. The heat-sealing device according to claim 1 or 2, wherein, The temperature sensor is composed of a strip thermocouple.

10. A control method for a heat-sealing device. The heat sealing device includes: The first sealing component has a sealing surface; The second sealing component is capable of heat-sealing the packaging material together with the first sealing component; A pulse heater that heats the sealing surface; A temperature sensor that detects the temperature of the pulsating heater; as well as A control device that controls the pulsating heater in such a way that the temperature detected by the temperature sensor becomes a target temperature. The first sealing component includes: Heating rod, including mounting surface; and A retractable sheet component having a sealing surface that covers at least a portion of the mounting surface in a first direction intersecting the mounting surface. The pulsating heater is disposed between the mounting surface and the sealing surface. The temperature sensor is disposed adjacent to the pulsating heater between the mounting surface and the sealing surface in the direction along the mounting surface. In the control method, The control of the pulse heater begins synchronously with the start timing of the heat-sealing action that brings the first and second sealing components close together to heat-seal the packaging material held by the first and second sealing components. The control of the pulsating heater is stopped synchronously with the end timing of the heat-sealing operation that separates the first sealing component and the second sealing component while they are in a state of being heat-sealed packaging material.

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

12. The control method according to claim 11, wherein, When the pulsating heater is controlled by PID control, the integral value is reset to zero in sync with the start timing of the heat sealing action.

13. The control method according to any one of claims 10 to 12, wherein, The target temperature is corrected based on the initial temperature of the sealing surface detected by the temperature sensor at the start timing of the heat sealing operation.

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

15. The control method according to any one of claims 10 to 12, wherein, In the heat-sealing operation, when the control periodically switches the pulsating heater from the off state to the on state and then back to the off state, when the pulsating heater switches from the on state to the off state in the first cycle, the pulsating heater is kept in the off state until the transition to the second cycle after the first cycle.

Images