JP2005112374A - Heat sealing packer, and heat sealing packaging method - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a heat sealing packer and a heat sealing packaging method, which shorten the electrified time to reduce the time needed for sealing in order to reduce power consumption and prevent a temperature rise in a machine, thereby extending a product life. <P>SOLUTION: The heat sealing packer comprises a temperature sensor 66 for sensing the temperature of a heater, and a controller 81 for controlling the electrification of the heater 32 during sealing work. The controller 81 sets a target temperature of the heater 32 on the basis of an input set time, and calculates an electrifying time of the heater 32 during the sealing work, using a difference between a prework temperature of the heater 32, which is sensed by the temperature sensor 66 before the sealing work, and the target temperature. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a heat-sealed packaging machine and a heat-sealed packaging method for sealing an opening of a packaging bag by heat welding in a state in which an article to be packaged is stored.

  Conventionally, a vacuum packaging machine has been known as one of heat sealed packaging machines that seals the opening of a packaging bag by heat welding in a state in which an object to be packaged such as food is stored in a packaging bag made of resin film or the like. For example, it is disclosed by Unexamined-Japanese-Patent No. 2002-19723 (patent document 1).

The invention described in Patent Document 1 is filled with an inert gas from an opening of a packaging bag set in a chamber, and press-contacts the opening with an upper sealing block and a lower sealing block containing a heater. A mechanism for heat sealing while sealing and a vacuum pump for reducing the pressure in the chamber are provided.
Therefore, this vacuum packaging machine can seal the package bag filled with inert gas after decompressing the entire package bag containing food and the like.

JP 2002-19723 A

  However, in the conventional heat-sealing packaging machine, when the sealing operation is performed continuously and repeatedly, the temperature of each sealing block tends to rise above the temperature suitable for sealing. As a result, even if the opening is melted too much and a hole is made in the packaging bag, or the sealing can be performed, the surface of the sealing portion of the packaging bag may be roughened. To solve this problem, it is conceivable to set the heating temperature, detect the heater temperature with a thermocouple, and control the current, but keep pressing the opening until the set temperature is reached and continue heat welding. Otherwise, the packaging bag cannot be sealed in a good state, and the sealing work time is extended. Therefore, it is difficult to perform an efficient sealing operation. In addition, the heater energization time is increased, the amount of electricity used is increased, the machine temperature of the heat sealing and packaging machine is increased, and the product life is shortened.

  Therefore, the present invention has been made in view of such circumstances, and an object of the present invention is to perform an efficient sealing work by shortening the energization time to the heater to shorten the time required for the sealing work. It is in providing the heat sealing packaging machine which can be, and the heat sealing packaging method.

The present invention has been proposed in order to achieve the above-mentioned object. In the present invention, the opening of the packaging bag set in the packaging area is press-contacted by the upper and lower sealing blocks, and the heater is used. In a heating and sealing packaging machine that includes a sealing mechanism that heats and heat-welds, and seals the opening of the packaging bag in a state in which an object to be packaged is stored,
Temperature detecting means for detecting the temperature of the heater, and control means for controlling energization of the heater at the time of sealing work,
The control means includes a target temperature setting means for setting a target temperature of the heater based on the input set value, a pre-operation temperature of the heater detected by the temperature detection means before the sealing work, and the target achievement An energization time calculation unit that calculates an energization time of a heater in a sealing operation by using a difference with temperature.

According to a second aspect of the present invention, the control means includes a reference post-sealing reached temperature storage means for storing a reference post-sealing reached temperature determined according to a set value,
2. The heat sealing packaging machine according to claim 1, wherein the target temperature setting means calculates a target temperature using the set value and a temperature after reference sealing.

According to a third aspect of the present invention, the reference post-sealing reached temperature storage means stores a plurality of correction post-sealing post-sealing temperatures for one set value,
The control means selects a temperature after correction reference sealing based on the input correction value,
The heating encapsulating machine according to claim 2, wherein the energization time calculating means calculates a target attainment temperature by using the set value and the selected attainment temperature after correction reference sealing. .

In the heat-sealed packaging method for sealing the opening of the packaging bag, the opening of the packaging bag is heat-welded by heating with a heater by pressing the opening of the packaging bag with the upper and lower sealing blocks,
Based on the input set value, set the target temperature of the heater, detect the pre-working temperature of the heater before the sealing work, and use the difference between the pre-working temperature and the target temperature to perform the sealing work. It is a heat-sealing packaging method characterized by calculating the energization time of the heater.

  According to a fifth aspect of the present invention, a target attainment temperature is calculated using the set value and an after-sealing attainable temperature determined according to the set value. This is a sealed packaging method.

  The one set forth in claim 6 sets a plurality of correction post-sealing final temperatures for one set value, selects a post-reference sealing post-sealing temperature based on the input correction value, 6. The heat sealing packaging method according to claim 5, wherein the target temperature is calculated using the set value and the selected post-sealing standard temperature for correction.

The present invention has the following effects.
That is, the target temperature of the heater is set based on the input set value, the pre-working temperature of the heater is detected before the sealing work, and the difference between the pre-working temperature and the target temperature is used for sealing. Since the heater energization time in the stopping operation is calculated, the energization time to the heater can be shortened to shorten the time required for heat welding. Therefore, the sealing work can be efficiently performed when the sealing work is repeatedly performed. Moreover, while reducing the electric usage-amount of a heat sealing packaging machine, the temperature rise of a heat sealing packaging machine can be prevented, and the product lifetime of a heat sealing packaging machine can be extended by extension.

  Further, since the target temperature is calculated using the set value and the reference post-sealing reached temperature determined according to the set value, the same target temperature can be calculated at any time by inputting the same set value. be able to. Therefore, for each sealing condition with different materials and thickness etc. of the packaging bag, it is necessary to check the setting value for obtaining the optimum sealing state in advance and enter this setting value during sealing work. It is easy to reproduce a suitable heater temperature. For this reason, it is possible to easily perform the operation with a good sealed state.

  Further, a plurality of correction post-sealing reached temperatures are set for one set value, and the correction post-sealing reached temperature is selected based on the input correction value, and the set value is selected. Since the target temperature is calculated using the corrected post-sealing target temperature, it is possible to correct the target temperature and adjust the heater temperature during the sealing operation. Therefore, even if there is a variation in the environment of the sealing operation or the thickness of the packaging bag, it can be set so that a good sealing state can be obtained.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. In the following embodiments, as a representative example of the heat-sealing packaging machine, a gas-filling packaging machine that fills an inert gas after directly degassing the inside of the packaging bag and then seals the opening of the bag by heat welding. An example of a so-called impulse sealer type gas filling and packaging machine in which the opening is thermally welded by energizing and heating the heater instantaneously will be described. 1 is a perspective view showing the overall appearance of the gas filling and packaging machine, FIG. 2 is a front view of the gas filling and packaging machine, FIG. 3 is a side view thereof, and FIG. 4 is a schematic diagram of the main part showing the internal structure of the gas filling and packaging machine. FIGS. 5A and 5B are enlarged views of main parts showing an example of a sealing mechanism part and a bag pressing member in a gas filling and packaging machine.

  The gas filling and packaging machine 1 is provided on the upper portion of the housing 2 in a state where the mounting tray 29 is inclined downward toward the rear of the housing 2, and the support shafts 9 arranged on both sides near the rear half of the housing 2. A cover-like arm 3 that can be opened and closed with respect to the center is provided, and a plurality of gas nozzles 5 are provided toward the rear of the housing 2 near the front surface of the housing in the packaging region 4 that is covered and partitioned. A sealing mechanism 6 for sealing the opening of the packaging bag 21 is provided in the vicinity of the tip of the gas nozzle 5, and a vacuum pump 19, a control device 81 (see FIG. 8) and the like are provided in the housing 2, and the arm 3. An operation unit 7 is provided on the front surface of the housing 2 located on the free end side.

  The packaging region 4 is surrounded by a rectangular dish-shaped base plate 8 and an arm 3 that opens and closes so as to cover the upper surface of the base plate 8. The arm 3 is rotatably supported (opened / closed) with respect to the base plate 8 by a support shaft 9 provided at the base end, and is locked in a closed state by a lock mechanism 10 provided on a side surface of the housing 2. It is configured as follows. As shown in FIGS. 2 and 3, the locking mechanism 10 is a hook provided on a pin 11 provided on one side in the tip cover portion of the arm 3 so as to rotate on one side of the base plate 8. 12 is configured to be locked when engaged. The hook 12 is operated by rotating the bent hook base end portion 12a by the solenoid 14 with the rotation shaft 13 as a fulcrum.

  The arm 3 is always urged in the opening direction by a spring 15 attached to the arm base end portion 3a in the vicinity of the support shaft 9, and when the hook 12 of the lock mechanism 10 is released from the pin 11, the arm 3 is automatically It is configured to open to Further, when the arm 3 is closed so as to cover the packaging region 4 from above, the arm base end portion 3 a comes into contact with the limit switch 16 to detect the closed state of the arm 3.

  A gas block 17 is provided near the open side end (front part) of the packaging area 4 so as to stand up from the base plate 8, and the upper end of the gas block 17 faces the inside of the packaging area 4. A plurality of gas nozzles 5 project substantially horizontally. The gas block 17 is hermetically connected to a suction system 20 of a vacuum pump 19 via a decompression drive chamber 18.

  As shown in FIG. 5, when the gas nozzle 5 is inserted into the opening of the packaging bag 21 above and below the gas nozzle 5 to be inserted into the opening of the packaging bag 21 containing the article to be packaged 22, the nozzle is inserted. Bag holding members 23a and 23b are provided to hold the outer surface of the bag portion at the position from above and below, thereby preventing the packaging bag 21 from shifting and ensuring the deaeration operation by the vacuum pump 19. The lower bag holding member 23a is provided on the upper surface of an inverted L-shaped stay 24 arranged so as to stand up directly below the nozzle of the gas block 17 in which the gas nozzle 5 is disposed. Further, the upper bag holding member 23b is provided on the lower surface of the stay 25 that is arranged obliquely so as to protrude from the upper sealing block 31b directly above the nozzle. The stay 25 provided with the upper bag pressing member 23b is fixed to the upper sealing block 31b via a pin 45 or the like, and the upper and lower bag pressing members 23a, 23b are set to substantially the full width of the sealing blocks 31a, 31b. It is provided over. In the present embodiment, gel members 40 are mounted as the upper and lower bag pressing members 23a and 23b.

  Further, the gas nozzle 5 is formed in a shape in which the sandwiched portion 52 by the bag pressing members 23 a and 23 b is flattened up and down, whereby the bag pressing members 23 a and 23 b are in close contact with the outer periphery of the gas nozzle 5 through the packaging bag 21. In addition, the opening of the packaging bag 21 can be prevented from being detached from the gas nozzle 5.

  Further, the gas nozzle 5 is provided so as to be able to swing with the nozzle base 51 as a fulcrum 50 so that the nozzle port 51 rotates up and down, and if the gas nozzle 5 is swung upward, the packaging bag is provided. The packaging bag 21 can be easily set in a state where the gas nozzle 5 is inserted into the opening 21.

  In addition, a branch is provided in the path from the gas nozzle 5 to the vacuum pump 19, and an inert gas (nitrogen or the like) or a filling gas such as oxygen is passed through the gas nozzle 5 into the degassed packaging bag 21. A gas cylinder for injection is hermetically connected. Accordingly, when the gas pump 5 is inserted into the opening of the packaging bag 21 and the vacuum pump 19 is operated with the arm 3 covered and locked, the air in the packaging bag 21 containing the article to be packaged 22 such as food is supplied to the gas nozzle 5. When the deaeration is completed, the gas in the gas cylinder can be filled into the packaging bag 21 through the gas nozzle 5. The operation of deaeration and gas filling will be described later.

  As shown in FIG. 5, the sealing mechanism 6 is provided in the vicinity of the bag pressing members 23a and 23b in the front part of the packaging area 4, and the back side of the packaging area 4 (the rear part, that is, the right side in FIG. 3) An abutting plate 27 and a width regulating plate 28 are provided for preventing the movement of the packaging bag 21 containing the article 22 to be packaged and for regulating and stabilizing the position of the packaging bag 21 sealed by the sealing mechanism 6. The installed tray 29 is provided so as to be inclined downward toward the back side opposite to the gas nozzle 5. When the packaging bag 21 containing the article 22 to be packaged is placed on the placing tray 29, the sealing portion (the band-like portion to be thermally welded) near the opening of the packaging bag 21 is stable at a predetermined position of the sealing mechanism portion 6. Then stop.

Next, the sealing mechanism unit 6 will be described.
As shown in FIG. 4, the sealing mechanism unit 6 stands in the packaging region 4 with the lifting rod 30 a of the lifting mechanism 30 having the lower end connected to the diaphragm 34 of the decompression drive chamber 18 provided at the front end portion of the base plate 8. The lower sealing block 31a is fixed to the upper end of the elevating rod 30a, and the upper sealing block 31b is provided on the top of the cover portion of the arm 3 so as to face the lower sealing block 31a. These sealing blocks 31 a and 31 b are configured as heater blocks that are long in the width direction of the packaging region 4. Further, linear or thin heaters 32 are arranged along the width direction on the pressure contact surfaces of the lower sealing block 31a and the upper sealing block 31b via a plate-like rubber member. The sealing block 31a is raised and pressed to the upper sealing block 31b side.

  In the decompression drive chamber 18, the diaphragm 34 and the lifting rod 30 a are urged downward by the return spring 33. When the inside of the decompression drive chamber 18 is decompressed, the diaphragm 34 rises against the urging force of the return spring 33. As a result, the lower sealing block 31a is raised. Therefore, when the lower sealing block 31a rises, it can be pressed against the upper sealing block 31b with the opening of the packaging bag 21 sandwiched therebetween. When the heater 32 is energized and heated in this state, the packaging sandwiched therebetween The bag 21 can be sealed by heat welding.

  In addition, the gas filling packaging machine 1 in the present embodiment is provided with an atmosphere release valve 55 (see FIG. 8) for introducing the atmosphere into the decompression drive chamber 18, that is, for releasing the atmosphere. Therefore, when the atmosphere release valve 55 is opened, the lower sealing block 31a is lowered by the urging force of the return spring 33 and returns to the original position.

  FIG. 6 is a schematic diagram showing a basic structure of the sealing block in the present embodiment. As shown in the figure, the main body of the lower sealing block 31a and the upper sealing block 31b is composed of an aluminum heater block 61 having a substantially trapezoidal plate shape, and the pressure contact surfaces of these heater blocks 61 and 61 are respectively phenolic. A silicon rubber 63 is attached via a resin plate (baking plate) 62 such as a resin, a heater 32 is stretched on the silicon rubber 63, and the heater 32 is covered with an insulating cloth 65. The heat of the heater 32 is transmitted to the upper and lower films of the packaging bag 21 via the. A temperature sensor 66 (corresponding to the temperature detecting means of the present invention) is disposed at one end of the upper sealing block 31b in contact with the heater 32 so that the temperature of the heater 32 can be detected. Yes.

  7A and 7B show a specific structure of the upper sealing block in the present embodiment, wherein FIG. 7A is an assembly front view, FIG. 7B is an assembly plan view, and FIG. 7C is an assembly perspective view of a sensor fixing bracket. It is. As shown in the figure, the upper sealing block 31b according to the present embodiment has a silicon rubber 63 attached to a pressure contact surface of a heater block 61 as a main body via a bake plate 62, and a belt-like heater between insulating cloths 65 and 65. 32 is stretched. A mounting base 70 having a triangular shape is screwed to one end of the heater block 61. A tension plate 71, a sensor fixing bracket 72, and a metal that are bent at the tip of the mounting base 70 are provided. The plate 73 is screwed in order from the bottom, a lead wire 74 for energizing the heater 32 is screwed on the metal plate 73, and the heater 32 connected to the lead wire 74 is extended along the tension plate 71. By providing, the heater 32 is stretched on the silicon rubber 63 via the insulating cloth 65 with the distal end portion of the stretch plate 71 as a bending fulcrum. The sensor fixing bracket 72 is a bracket for attaching the temperature sensor 66, and a pair of opposing support portions 72a and 72b are formed at the tip thereof, and an insertion hole formed in the support portions 72a and 72b. The temperature sensor 66 is inserted into and supported by 73. In the present embodiment, for example, a thermistor is used as the temperature sensor 66, and the assembly parts such as the sensor fixing bracket 72 in the mounting base 70 are covered with the protective cover 75 to prevent the temperature sensor 66 from being damaged. Yes.

  In the state where the heater 32 is supported by the sensor fixing bracket 72 having such a configuration and attached to the attachment base 70 together with the tension plate 71 and the metal plate 73, the temperature sensor is bent after the heater 32 is bent at the distal end portion of the tension plate 71. 66 will be in close contact with the outside. Therefore, since the temperature sensor 66 can be brought into close contact with the heater 32 without using an adhesive or the like, disassembly and assembly can be performed as necessary. Thus, maintenance work such as replacing the disconnected heater 32 can be easily performed.

  Further, as shown in FIG. 5, non-heated portions (positively heated) positioned on the pressure contact surfaces of the lower sealing block 31 a and the upper sealing block 31 b are located closer to the storage portion than the sealing portion of the packaging bag 21. The press clamping part which presses down the part which is not) is arranged. In the present embodiment, as the pressing nipping portion, on one surface of the pressure contact surfaces facing each other of the lower sealing block 31a and the upper sealing block 31b, the surface is located closer to the storage portion of the packaging bag 21 than the heater 32. A protrusion 36 is provided. The protrusion 36 is configured by a metal wire fixed to the end of the pressure contact surface of the upper sealing block 31b (the end opposite to the gas nozzle) along the longitudinal direction of the block 31b. As described above, the metal wire 36 is configured to hold down the non-heated portion closer to the storage portion than the sealing portion of the packaging bag 21, and raises the lower sealing block 31a to press-contact the upper sealing block 31b. As a result, the rubber member mounted on the pressure contact surface of the lower sealing block 31a is recessed, whereby the non-heated portion of the packaging bag 21 sandwiched therebetween can be clamped with a stronger force than the other pressure contact surfaces. Therefore, due to this strong clamping force, the tensile force resulting from the expansion force due to gas filling acts on the sealing portion of the packaging bag 21 sandwiched between both pressure contact surfaces of the lower sealing block 31a and the upper sealing block 31b. Can be prevented.

Next, the control system of the gas filling packaging machine 1 will be described.
In the control system 80 shown in FIG. 8, a control device 81 (corresponding to the control means, the target temperature setting means, and the energization time calculation means of the present invention) functions as a controller that controls the operation of the gas filling packaging machine 1. ROM 82 (corresponding to the post-sealing reached temperature storage means of the present invention) storing a control routine and the like for this operation, a CPU 83 and the like are provided. The control device 81 connects the heater 32 and the temperature sensor 66 so that the temperature detected by the heater 32 can be input from the temperature sensor 66, and the heater 32 is energized for a later-described energization time (optimal sealing time). And can be energized. In addition, the atmosphere release valve 55 and the solenoid 14 of the lock mechanism 10 are electrically connected to the control device 81.

  Further, the control device 81 electrically connects the operation unit 7 described above and performs a sealing operation from the operation unit 7, specifically, a set time when performing heat welding with the heater 32 (corresponding to a set value of the present invention). It is configured to be able to input. This set time is a value that is input as a measure of the time during which the heater 32 is energized during the sealing operation (that is, the operation of performing sealing every time), specifically, to the heater 32 desired by the operator. Is the upper limit of the energization time. The time during which the heater 32 is actually energized is calculated by the controller 81 based on the set time, the reference temperature reached on the ROM 82, and the numerical value of the detected temperature of the heater 32 obtained from the temperature sensor 66. The process of calculating the energization time for the heater 32 will be described in detail later.

  The ROM 82 stores data of the temperature table shown in FIG. 9 in advance. In this temperature table, the set time that can be input from the operation unit 7 is set in increments of 0.1 [sec] in the range of 0.1 to 4.0 [sec], and reached after the reference seal corresponding to each set time. A temperature [° C.] (corresponding to a temperature reached after the reference sealing of the present invention) is given. The temperature reached after the reference seal is a numerical value used when the energization time to the heater 32 is calculated. The initial state assumed as a default value, that is, the temperature of the heater 32 before energization (the temperature before the reference seal) is 5. FIG. 10 shows how much temperature the heater 32 is made to reach after the elapse of a reference time (1.2 [sec] in the present embodiment) set as a default value from the state of ° C. (see FIG. 10). . The reached temperature after the reference seal is an empirical value calculated based on actual measurement. When the heater 32 is energized until the set time and the sealing operation is performed, a good (good finish) thermal welding state is obtained. Is determined based on the data obtained when That is, the temperature reached after the reference seal is a temperature that is reached when the reference time has elapsed when the heater 32 is energized at the rate of temperature increase when a good heat-welded state is obtained.

  Furthermore, in addition to the above-described temperature after reaching the reference seal, the ROM 82 increased the difference value to 0.5 ° C., 1.0 ° C., 1.5 ° C., etc., after reaching the temperature after the reference seal as shown in FIG. The plus side correction value is stored as the temperature reached after correction reference sealing (corresponding to the temperature reached after correction reference sealing of the present invention). In addition, the ROM 82 stores a minus side correction value obtained by reducing the difference value such as 0.5 ° C., 1.0 ° C., 1.5 ° C., etc., as the post-reference seal reached temperature as the post-reference seal post-arrival temperature. In this manner, the ROM 82 stores a plurality of corrected post-reference seal reached temperatures for one set time input by the operator. The ROM 82 of the present embodiment stores five types of plus-side correction value temperature tables, four types of minus-side correction value temperature tables, and a total of nine types of temperature tables after reaching the reference seal post-correction temperature. However, the present invention is not limited to this. Further, the difference value is not limited to a multiple of 0.5 ° C., and a numerical value may be set as appropriate.

Next, a series of sealing operations by the gas filling packaging machine 1 will be described.
A packaging bag 21 containing an article to be packaged 22 such as food is placed on the placing tray 29. At this time, the packaging bag 21 is swung upward with the fulcrum 50 as an axis. The nozzle port 51 of the gas nozzle 5 is inserted into the opening 21 and the gas nozzle 5 is swung downward again to set the packaging bag 21.

  Next, the setting time [sec] of the sealing operation is input to the control device 81 by the operation unit 7 within a range of 0.1 to 4.0, for example. When the arm 3 is put on and locked by the lock mechanism 10, the limit switch 16 is turned on. Upon receiving a detection signal from the limit switch 16, the control device 81 moves the flow path switching valve (not shown) to the vacuum pump 19 side. Switching, the inside of the packaging bag 21 is deaerated through the gas nozzle 5 (deaeration step). At that time, the bag pressing members 23a and 23b arranged above and below the gas nozzle 5 hold the bag portion at the nozzle insertion position from above and below.

  And the control apparatus 81 switches a flow-path switching valve to the gas cylinder side, and is filled with inert gas, oxygen, etc. in the packaging bag 21 from the gas nozzle 5 (gas filling process). Also in this case, as described above, the bag pressing members 23a and 23b disposed above and below the gas nozzle 5 sandwich the bag portion at the nozzle insertion position from above and below, and the upper and lower bag pressing members 23a and 23b are packaged. It tightly adheres to the periphery of the gas nozzle 5 via the bag 21 and prevents the opening of the packaging bag 21 from being detached from the gas nozzle 5 due to the gas filling pressure.

  When the gas filling process is completed, the control device 81 detects the temperature of the heater 32 before entering the sealing operation by the temperature sensor 66. If the temperature of the heater 32 is detected, the gas filling packaging machine 1 starts a sealing operation for sealing the opening of the packaging bag 21. Specifically, with the bag pressing members 23a and 23b sandwiching the bag portion at the nozzle insertion position, the control device 81 switches the deaeration valve (not shown) to depressurize the decompression drive chamber 18 and seal the lower part. While the block 31a is raised and the sealing portion of the packaging bag 21 is sandwiched between the block 31a and the upper sealing block 31b, the protruding portion 36 presses and holds the non-heated portion of the packaging bag 21 with a strong pressure.

In this state, the process proceeds to the heat welding step, and the control device 81 calculates the energization time to the heater 32 and energizes the heater 32 over this energization time. Here, the calculation process of the energization time to the heater 32 will be specifically described. When the set time is input from the operation unit 7, the control device 81 arrives after the reference seal corresponding to the set time from the temperature table of the ROM 82. The temperature is selected (read), the reference post-sealing reached temperature [° C.] and the set time [sec] are substituted into the following equation 1, and the target value of the temperature reached by the heater 32 after the set time, that is, the target reached temperature [° C.] is determined (see FIG. 10).
Target temperature = [(target temperature after reference seal−temperature before reference seal) × set time / reference time] + temperature before reference seal ... Equation 1

Further, the control device 81 detects the temperature of the heater 32 before energization by the temperature sensor 66 and sets it as a measured pre-sealing temperature [° C.] (corresponding to the pre-working temperature of the present invention). By substituting the temperature into the following equation 2, the energization time (optimum sealing time) [sec] for actually energizing the heater 32 is determined.
Energizing time = (target reached temperature-measured temperature before seal) x set time / (target reached temperature-reference seal before temperature) ... Formula 2

  In addition, from the above formula 2, when the measured pre-sealing temperature is equal to the reference pre-sealing temperature (5 ° C. in the present embodiment), the energization time is equal to the set time. Further, when the measured pre-sealing temperature is higher than the reference pre-sealing temperature, the energization time is shorter than the set time. In this embodiment, since the reference pre-seal temperature is set to 5 ° C., in a state where the measured pre-seal temperature is 5 ° C. or more, for example, in an indoor sealing operation air-conditioned to about 20 ° C., energization is performed. Time is shorter than the set time. That is, the control device 81 does not energize the heater 32 for longer than the set time.

  As described above, since the energization time is calculated using the difference between the target temperature and the measured pre-sealing temperature, it is possible to improve the sealing reliability by optimizing the sealing temperature. The time required for heat welding can be shortened by shortening the energization time. Therefore, the sealing operation can be performed efficiently. In addition, the amount of electricity used in the gas filling and packaging machine can be reduced, and the temperature rise of the heater transformer and the like (not shown) of the gas filling and packaging machine can be prevented, thereby extending the product life of the gas filling and packaging machine. Can do.

  When the heater 32 is energized and generates heat after the energization time is calculated in this way, the sealing portion of the packaging bag 21 sandwiched between the lower sealing block 31a and the upper sealing block 31b by this heat. Is thermally welded. At this time, since the non-heated portion is sandwiched between the protrusions 36, the packaging bag 21 is not affected by the tensile force due to the expansion force due to gas filling.

  When the time for energizing the heater 32 elapses and the heat welding process ends, the control device 81 cuts off the power to the heater 32 and performs the cooling process for a predetermined time. Thereafter, since the control device 81 opens the atmosphere release valve 55, the pressure in the decompression drive chamber 18 returns to the atmospheric pressure, and the lower sealing block 31a is lowered by the urging of the return spring 33 to complete the sealing operation. And when sealing of the packaging bag 21 is complete | finished, since the control apparatus 81 excites the solenoid 14 of the lock mechanism 10, the hook 12 will rotate and it will remove | deviate from the pin 11, and will cancel | release a lock | rock. Therefore, the packaging bag 21 can be taken out after raising the arm 3.

  In the past, if it was attempted to shorten the time of the sealing work for each time, the time required for the cooling process tended to be shortened (see the dotted line graph in FIG. 12). Therefore, the packaging bag is taken out in a state (point D) in which the temperature of the heater 32 and the heat-welded portion is higher than the temperature at which the material of the packaging bag is sufficiently solidified, and the opening that should have been sealed is sufficiently solidified. There was a risk of opening it. However, the gas-filled packaging machine 1 of the present embodiment can reduce the time required for the sealing operation by controlling the energization time to the heater 32, and further reduce the time required for the heat welding process. Therefore, the cooling process can be performed so that the heat-welded portion is sufficiently solidified by spending the time shortened in the heat-welding process in the time of the cooling process. Therefore, the packaging bag can be sufficiently sealed while shortening the time for the sealing operation.

  Furthermore, when sealing the packaging bag repeatedly and repeatedly, the packaging bag is newly set according to the procedure described above, and the deaeration process, gas filling process, thermal welding process, and cooling process are repeated, and the sealing operation is performed each time. Do. Note that the control device 81 maintains the input set time value even after the sealing work is completed, and updates the set time when it is re-input from the operation unit 7. Therefore, in the case where the thickness, material, etc. of the packaging bag 21 are not different from the previous time, the control device 81 can calculate the same target temperature as the previous time by Equation 1 without re-inputting the set time.

  Further, in the above equation 2, the actual measured pre-sealing temperature input from the temperature sensor 66 is used as a factor for calculating the energization time. Therefore, in consideration of the residual temperature after the previous heat welding process, the subsequent (second) and subsequent times are used. The energization time can be further shortened.

  More specifically, as shown in FIG. 12, the control device 81 has a temperature (target target temperature) at which the sealing state of the heater 32 is easily finished well from the work start temperature (for example, room temperature) S in the first (previous) heat welding process. It takes t1 time to increase the temperature to point A) and complete the heat welding process. And in the initial state of the next heat welding process after the last heat welding process, the heater 32 and the heater block 61 are heated to some extent even after the sealed portion welded in the cooling process B is solidified. . That is, the heater 32 has a temperature at point C higher than the point S. By substituting the temperature at this point C into Equation 2 as the actual measured pre-sealing temperature, the controller 81 calculates the energization time and energizes the heater 32, so that the heater 32 rises in temperature from point C and is sealed again. It is only necessary to energize for a time t2 shorter than t1 up to the point A 'where the state is easy to finish.

  Furthermore, since the control device 81 stores the reference post-sealing reached temperature for each set time in the ROM 82, the same target reached temperature can be calculated at any time by inputting the same set time from the operation unit 7. Therefore, for example, for each sealing condition with different material and thickness of the packaging bag, the set time for obtaining the optimum sealing state is checked in advance, and before the sealing operation, If the set time is input according to the conditions, the packaging bag can be sealed with good finish at any time.

  In addition, if a correction value is input from the operation unit 7 before the sealing operation, the control device 81 sets which correction temperature table is selected from the plurality of correction temperature tables. Further, by inputting the set time, the control device 81 selects a correction post-sealing final temperature corresponding to the set time from a pre-selected correction temperature table, and calculates the post-correction reference seal post-temperature. Substituting into 1, the target temperature reached is calculated. There is a difference between the calculated target arrival temperature and the target arrival temperature obtained from the reference post-sealing arrival temperature of the standard temperature table shown in FIG. 9, and the arrival temperature of the heater 32 in the heat welding process can be adjusted. it can. Therefore, the gas-filled packaging machine 1 can be adjusted so that a good sealed state can be obtained by inputting the correction value in advance even if there is a variation in the environment of the sealing work or the thickness of the packaging bag. .

  The timing for detecting the temperature of the heater 32 as the pre-measurement seal temperature is not limited to the above-described embodiment, and may be the same as, for example, the sealing blocks 31a and 31b sandwiching the sealing portion of the packaging bag 21. The sealing blocks 31a and 31b may be immediately after the sealing portion of the packaging bag 21 is sandwiched. However, as in the above embodiment, if the temperature of the heater 32 is detected immediately before the sealing portion of the packaging bag 21 is sandwiched, in other words, immediately before the sealing operation is started, the heater is used before the previous sealing operation. It is preferable because the temperature of the heater 32 can be detected in a state where the heat accumulated in the 32 is not released to the packaging bag 21. That is, detection is performed in a state where the temperature of the heater 32 is high, the temperature difference between the target reached temperature and the pre-measurement seal temperature can be reduced, the energization time can be shortened, and the time required for heat welding can be shortened.

  Moreover, in the said embodiment, although the control apparatus 81 detected the actually measured temperature before sealing for every sealing operation | work, it is not restricted to this. For example, the control device 81 stores the temperature before the actual seal several times in the past, and if the variation in the temperature before the actual seal is within an allowable range, the temperature before the sealing operation of the heater 32 is almost stable. The temperature before measurement may be detected by the temperature sensor 66 at a rate of once for a plurality of sealing operations.

In the above embodiment, the gas nozzle 5 not only performs gas filling but also functions as one element (intake port) of the deaeration means, but the gas filling packaging machine used in the present invention is not limited to this. Alternatively, a separate deaeration nozzle may be provided to separate the functions of the gas filling means and the deaeration means. Moreover, the heater 32 should just be distribute | arranged to either one of the upper and lower sealing blocks 31a and 31b, if it is comprised with sufficient heat transfer. And the gas with which it fills from the gas nozzle 5 is not restricted to inert gas, such as nitrogen gas, or oxygen, You may select suitably as needed.
Further, in the above embodiment, the packaging area is open to the atmosphere, but the packaging area is set in the chamber so that it can be vacuum-packed, that is, provided with a sealing mechanism portion that is thermally welded and sealed. You may apply to the heat sealing packaging machine which served as the vacuum packaging machine.

It is a perspective view which shows the whole external appearance of a gas filling packaging machine. It is a front view of a gas filling packaging machine. It is a side view of a gas filling packaging machine. It is a schematic diagram of the principal part which shows the internal structure of a gas filling packaging machine. It is a principal part enlarged view which shows an example of the sealing mechanism part and bag pressing member in a gas filling packaging machine. It is a schematic diagram which shows the basic structure of a sealing block. The concrete structure of an upper sealing block is shown, (a) is the assembly front view, (b) is the assembly top view, (c) is the assembly perspective view of a sensor fixing metal fitting. It is the schematic which shows the control system of a gas filling packaging machine. It is the temperature table which showed the relationship between setting time and the temperature reached after a reference seal. It is explanatory drawing which showed the relationship between reference | standard time and the arrival time after reference | standard sealing, and the relationship between setting time and target arrival temperature. It is a correction temperature table showing the relationship between the set time and the temperature reached after the correction reference seal. It is a relationship diagram of energization time and heater temperature.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Gas filling packaging machine 2 Housing | casing 2a Right side panel 2b Left side panel 3 Arm 3a Arm base end part 4 Packaging area 5 Gas nozzle 6 Sealing mechanism part 7 Operation part 8 Base plate 9 Spindle 10 Lock mechanism 11 Pin 12 Hook 12a Hook Base end portion 13 Rotating shaft 14 Solenoid 15 Spring 16 Limit switch 17 Gas block 18 Decompression drive chamber 19 Vacuum pump 20 Suction system 21 Packaging bag 22 Packaged items 23a and 23b Bag pressing members 24 and 25 Stay 27 Butting plate 28 Width Restriction plate 29 Placement tray 30 Lifting mechanism 30a Lifting rod 31a Lower sealing block 31b Upper sealing block 32 Heater 33 Return spring 34 Diaphragm 36 Press clamping part (protrusion part, metal wire)
40 Gel member 41, 42 Fixing tool 43 Bracket 44 Pin hole 45 Pin 50 Support point 51 Nozzle port 55 Air release valve 61 Heater block 62 Resin plate 63 Silicon rubber 65 Insulation cloth 66 Temperature sensor (temperature detection means)
70 Mounting base 71 Extension plate 72 Sensor fixing bracket 72a, 72b Support portion 73 Metal plate 74 Lead wire 75 Protective cover 80 Control system 81 Control device 82 ROM
83 CPU

Claims (6)

It has a sealing mechanism that presses the opening of the packaging bag set in the packaging area with the upper and lower sealing blocks, heats it with a heater, and heat welds it. In the heat sealing packaging machine to seal,
Temperature detecting means for detecting the temperature of the heater, and control means for controlling energization of the heater at the time of sealing work,
The control means includes a target temperature setting means for setting a target temperature of the heater based on the input set value, a pre-operation temperature of the heater detected by the temperature detection means before the sealing work, and the target achievement A heating and sealing packaging machine comprising: an energization time calculating means for calculating an energization time of a heater in a sealing operation using a difference with temperature. The control means includes a reference post-sealing reached temperature storage means for storing a reference post-sealing reached temperature determined according to a set value,
2. The heat sealing packaging machine according to claim 1, wherein the target temperature setting means calculates the target temperature using the set value and the temperature after reference sealing. The reference post-arrival temperature storage means stores a plurality of correction post-sealing final temperatures for one set value,
The control means selects a temperature after correction reference sealing based on the input correction value,
The heating encapsulating machine according to claim 2, wherein the energization time calculating means calculates a target attainment temperature using the set value and the selected attainment temperature after correction for reference sealing. In the heat sealing packaging method in which the opening of the packaging bag is pressed with the upper and lower sealing blocks and heated with a heater and thermally welded, and the opening of the packaging bag is sealed,
Based on the input set value, set the target temperature of the heater, detect the pre-working temperature of the heater before the sealing work, and use the difference between the pre-working temperature and the target temperature to perform the sealing work. A heat sealing and packaging method, characterized in that the energization time of the heater is calculated.   5. The heat sealing packaging method according to claim 4, wherein a target attainment temperature is calculated using the set value and an after-sealing attainment temperature determined in accordance with the set value. A plurality of correction post-sealing final temperatures are set for one set value, a correction post-sealing final temperature is selected based on the input correction value, and the set value and the selected correction temperature are selected. 6. The heat sealing packaging method according to claim 5, wherein the target reaching temperature is calculated using the reference post-sealing reached temperature.

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