JP2023065021A - Oxygen concentration control method in packaging container and packaging machine - Google Patents

Abstract

To provide an oxygen concentration control method in a packaging container and a packaging machine to which the control method is applied, which can prevent a production of a large quantity of products in which an oxygen concentration remaining in a packaging container is out of specification.SOLUTION: An oxygen concentration control method in a packaging container H of the present invention includes steps of: sequentially measuring an oxygen concentration in the packaging container H produced through a packing process of a packaged object, a gas substitution process, and a seal process, and transmitting an oxygen concentration measurement value sequentially measured in the packaging container H to a control unit 70 (S1); determining by the control unit 70 whether the oxygen concentration measurement values are on a rising trend (S2); and, when the control unit 70 determines that the oxygen concentration measurement values are on a rising trend, reducing a remaining oxygen concentration in the packaging container H (S3 and S4).SELECTED DRAWING: Figure 1

Description

TECHNICAL FIELD The present invention relates to a method for controlling the oxygen concentration in a packaging container by feedback-controlling the oxygen concentration in the packaging container, and a packaging machine to which the control method is applied.

Especially when the items to be packaged are foods, in order to extend the shelf life and expiration date, the remaining air (oxygen concentration is about 20.6%) is removed from the packaging container at the time of packaging, and nitrogen, carbon dioxide, and other impurities are removed. Gas replacement packaging filled with active gas is being carried out. In Patent Document 1, an article to be packaged is put into a packaging container, and an inert gas is filled from a gas nozzle inserted into the packaging container to replace the air in the packaging container with the inert gas. A filling method is disclosed.

In product inspection, the applicant of the present application has proposed a measurement method using a laser oxygen concentration measuring device (Patent Document 2) as a method for measuring the oxygen concentration remaining in a packaging container in which an object to be packaged is packaged.

By the way, in inert gas filling, if the flow rate of the inert gas decreases for some reason, for example, the filling accumulates inside the gas pipe inside the gas nozzle, the residual oxygen concentration in the packaging container increases, and the residual oxygen concentration However, there is a possibility that a large amount of products outside the standard value (for example, the oxygen concentration is about 3%) will be produced and flowed out.

Japanese Patent No. 3742042 Japanese Patent No. 5124719

Therefore, an object of the present invention is to provide a method for controlling the oxygen concentration in a packaging container that can prevent the production of a large amount of products in which the concentration of oxygen remaining in the packaging container is outside the standard value, and packaging that uses the control method. to provide the machine.

To solve the above problems, at least the oxygen concentration in the packaging container of the product produced through the filling process of the object to be packaged, the gas replacement process and the sealing process is sequentially measured, and the oxygen concentration in the packaging container that is sequentially measured communicating the measured concentration to a controller; determining, by the controller, whether the measured oxygen concentration is trending upward; and determining that the measured oxygen concentration is trending upward. and a step of lowering the residual oxygen concentration in the packaging container when determined (Claim 1).

When the control unit determines that the oxygen concentration measurement value is on an upward trend, the step of decreasing the residual oxygen concentration in the packaging container instructs the control unit to increase the flow rate of the replacement gas in the gas replacement step. and increasing the flow rate of the replacement gas by means of a flow rate controller (claim 2). When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the control to lower the position of the gas nozzle in the packaging container in the gas replacement step. and a step of lowering the position of the gas nozzle in the packaging container (Claim 3). When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the step of instructing the control unit to lower the rotation speed of the packaging machine; and a step of decreasing the number of revolutions of the packaging machine and increasing the replacement gas filling time in the packaging container (claim 4). Judgment by the control unit as to whether or not the measured oxygen concentration value is on an upward trend is determined to be on an upward trend when the measured oxygen concentration value reaches a set value that is lower than the shipping standard value. (Claim 5). It is preferable that the control unit determines whether or not the oxygen concentration measured value is on the rise based on a plurality of set oxygen concentration measured values (Claim 6). When the control unit determines that the measured oxygen concentration value is on an upward trend, after the step of decreasing the residual oxygen concentration in the packaging container, the control unit determines whether the measured oxygen concentration value is on an upward trend. The step of determining is performed, and the step of decreasing the residual oxygen concentration in the packaging container is preferably repeated as long as the control unit determines that the measured oxygen concentration is on an upward trend (Claim 7).

Further, what solves the above problems is a filling device for filling a packaging container with an object to be packaged, a gas replacement device for replacing the air in the packaging container with an inert gas, and the packaging container. A packaging machine having a sealing device for sealing, and an oxygen concentration measuring device for sequentially measuring the oxygen concentration in the packaging container of the product produced through the process of filling the product to be packaged, the gas replacement process and the sealing process. The packaging machine comprises a step of transmitting to a control unit the oxygen concentration measurement values in the packaging container sequentially measured by the oxygen concentration measuring device; The oxygen concentration control is performed, comprising a step of determining by a control unit, and a step of decreasing the residual oxygen concentration in the packaging container when the control unit determines that the measured value of oxygen concentration tends to increase. (Claim 8).

When the control unit determines that the oxygen concentration measurement value is on an upward trend, the step of decreasing the residual oxygen concentration in the packaging container instructs the control unit to increase the flow rate of the replacement gas in the gas replacement step. and increasing the flow rate of the replacement gas by means of a flow rate controller (claim 9). When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the control to lower the position of the gas nozzle in the packaging container in the gas replacement step. and a step of lowering the position of the gas nozzle in the packaging container (Claim 10). When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the step of instructing the control unit to lower the rotation speed of the packaging machine; and a step of decreasing the number of revolutions of the packaging machine and increasing the replacement gas filling time in the packaging container (Claim 11). Judgment by the control unit as to whether or not the measured oxygen concentration value is on an upward trend is determined to be on an upward trend when the measured oxygen concentration value reaches a set value that is lower than the shipping standard value. (Claim 12). It is preferable that the control unit determines whether or not the oxygen concentration measured value is on the rise based on a plurality of set oxygen concentration measured values (Claim 13). When the control unit determines that the measured oxygen concentration value is on an upward trend, after the step of decreasing the residual oxygen concentration in the packaging container, the control unit determines whether the measured oxygen concentration value is on an upward trend. The step of determining is performed, and the step of decreasing the residual oxygen concentration in the packaging container is preferably repeated as long as the control unit determines that the measured oxygen concentration is trending upward (Claim 14).

According to the oxygen concentration control method in the packaging container according to claim 1, it is possible to prevent the production of a large amount of products in which the concentration of oxygen remaining in the packaging container is outside the standard value.
According to the method for controlling the oxygen concentration in the packaging container according to claims 2 to 4, the effect of claim 1 can be achieved by a simple method.
According to the method for controlling the oxygen concentration in the packaging container according to claim 5, since the oxygen concentration control in the packaging container is performed before the oxygen concentration measurement value reaches the shipping standard value, the oxygen remaining in the packaging container is reduced. It is possible to further prevent the production of products that are out of specification.
According to the oxygen concentration control method in the packaging container according to claim 6, it is possible to more accurately determine whether or not the oxygen concentration measured value is on an upward trend.
According to the method for controlling the oxygen concentration in the packaging container according to claim 7, as long as the measured value of the oxygen concentration is on an upward trend, the oxygen concentration control is repeatedly performed to ensure normalization of the oxygen concentration in the packaging container. can be done.
According to the packaging machine of claim 8, it is possible to prevent the production of a large amount of products in which the concentration of oxygen remaining in the packaging container is outside the standard value.
According to the packaging machine described in claims 9 to 11, the effect of claim 1 can be realized with a simple configuration.
According to the packaging machine of claim 12, since the oxygen concentration control in the packaging container is performed before the oxygen concentration measurement value reaches the shipping standard value, the oxygen remaining in the packaging container is outside the standard value. production can be further prevented.
According to the packaging machine of claim 13, it is possible to more accurately determine whether or not the oxygen concentration measurement value is on the rise.
According to the packaging machine of claim 14, the oxygen concentration in the packaging container can be reliably normalized by repeating the oxygen concentration control as long as the measured value of oxygen concentration is on an upward trend.

1 is a flow chart for explaining an embodiment of a method for controlling oxygen concentration in a packaging container according to the present invention; FIG. 3 is an explanatory diagram for explaining a step in which a control unit determines whether or not a measured value of oxygen concentration tends to increase in the method for controlling the oxygen concentration in the packaging container shown in FIG. 1; 1 is a schematic plan view of an embodiment of a packaging machine of the present invention; FIG. FIG. 4 is an explanatory diagram for explaining an oxygen concentration measuring device of the packaging machine shown in FIG. 3; FIG. 4 is an explanatory diagram for explaining the operation of the gas replacement device of the packaging machine shown in FIG. 3;

In the present invention, the oxygen concentration in the packaging container H of the product produced through the process of filling the object to be packaged, the gas replacement process and the sealing process is sequentially measured, and the measured oxygen concentration in the packaging container H is measured in sequence. Step S1 for transmitting to the control unit 70; Step S2 for the control unit 70 to determine whether the measured oxygen concentration value is on an upward trend; By having steps S3 and S4 for reducing the residual oxygen concentration in the packaging container H, the packaging container can prevent the production of a large amount of products in which the oxygen concentration remaining in the packaging container H is outside the standard value. A method for controlling the oxygen concentration in H and a packaging machine P to which the control method is applied have been realized.

The method for controlling the oxygen concentration in the packaging container of the present invention is performed using an embodiment of the packaging machine of the present invention (packaging machine to which the method for controlling the oxygen concentration in the packaging container of the present invention) shown in FIGS. 1 to 5 is used. to explain.

The packaging machine P of this embodiment includes a filling device 20 for filling a packaging container H with an object to be packaged, a gas replacement device 50 for replacing the air in the packaging container H with an inert gas, and a packaging container H. a sealing device 60 for sealing H, and an oxygen concentration measuring device G for sequentially measuring the oxygen concentration in the packaging container H of the product produced through the process of filling the material to be packaged, the gas replacement process and the sealing process. The packaging machine P includes a step S1 of transmitting to the control unit 70 the oxygen concentration measurement values in the packaging container H sequentially measured by the oxygen concentration measuring device G; If the control unit 70 determines that the oxygen concentration measurement value is on the rise, the control unit 70 instructs the gas replacement gas device 50 to increase the flow rate of the replacement gas. and a step S4 of increasing the flow rate of the replacement gas by means of a flow rate controller. Each configuration will be described in detail below.

The packaging machine P of this embodiment is a device for opening the bag opening of a packaging container (packaging bag) H, filling and sealing an object to be packaged, and as shown in FIG. A bag feeding step (station 1) in which the packaging container (packaging bag) H is sequentially conveyed (regardless of whether it is intermittent or continuous) to the grip pair g, and the expiration date on the packaging container (packaging bag) H. etc., a print inspection process (station 3) for performing print inspection, a bag opening process (station 4) for opening the upper opening of the packaging container (packaging bag) H, and a filling device A filling step (station 5) for filling the packaging container (packaging bag) H with the object to be packaged by 20, and a gas filling step (station 6, 7), a top seal step (station 8) in which the vicinity of the upper opening of the packaging container (packaging bag) H is horizontally sealed by the sealing device 60, and the top seal is cooled (weighted) by the seal cooling device 80. A seal cooling/oxygen concentration measuring process (station 9) in which the oxygen concentration in the packaging container H is measured by the oxygen concentration measuring device G, and a product discharging process (station 10 ) is repeatedly performed to mass-produce products filled with the items to be packaged.

Although this embodiment is a gas-filled rotary packaging machine P in which a moving body (disk-shaped rotating body) 53 is rotationally driven, the packaging machine of the present invention is not limited to this, and a known linear movement system is used. A packaging machine, a truck-type packaging machine, or the like may be used. A linear movement type packaging machine is, for example, provided with a large number of grip pairs on a moving body that moves horizontally in an annular passage consisting of a linear portion and semicircular portions at both ends thereof so as to be convertible between an upright posture and a horizontal posture, and in the bag feeding process. This is a structure in which a supplied packaging container is supported by each pair of grips, and the packaging container is intermittently stopped in each process such as the opening process, the filling process, and the sealing process of the bag mouth to pack the items to be packaged. It also includes a bag-feeding and packaging machine in which the bag-gripping portion is composed of a pair of grips other than a pair of grips. Furthermore, the contents of each packaging station and the number of stations are not limited to this embodiment, and can be appropriately changed in design according to the packaging container or the items to be packaged.

Furthermore, the packaging machine of the present invention may be a vertical pillow packaging machine or a horizontal pillow packaging machine that forms a bag from a sheet-like film and fills and packages the object to be packaged in the bag, or other bag making and packaging machines. Alternatively, the packaging container oxygen concentration measuring device G may be arranged in the product discharge path of the packaging machine or in the downstream outline of the packaging machine.

Furthermore, the packaging container may be a bottle or resin-molded container as well as a packaging bag as in this embodiment. Alternatively, the oxygen concentration measuring device G for the packaging container may be arranged above the conveyor through which vertically oriented bottles pass and in the vicinity of the product discharge path.

A stand for freely rotatably supporting a vertical intermittent rotation shaft (not shown) is provided on a machine base 51 of the packaging machine P. A disk-shaped rotating body (moving body) 53 attached to the intermittent rotation shaft , 20 grip pairs g for gripping or releasing the packaging container H are provided so as to protrude in the radial direction at equal angular intervals. In the packaging machine P of this embodiment, the packaging oxygen concentration measuring device G is arranged in the seal cooling/oxygen concentration measuring process (station 9).

The oxygen concentration measuring device (O2 laser sensor) G is a packaging container H (not limited to a packaging container filled with food, such as an infusion bag filled with a medical infusion solution, etc.) filled with an object to be packaged and replaced with gas. (including packaging containers filled with other than food).) An oxygen concentration measuring device for packaging containers that measures the oxygen concentration inside, and has a transmitter 30 that emits a laser beam of a specific wavelength as shown in FIG. A laser generator 31 and a laser receiver 33 having a receiver 32 for receiving laser light emitted from a transmitter 30 are provided. A laser type gas densitometer M is arranged at the tip of the laser emitting part 33 while the separation distance between the tip part 31a of the laser emitting part 31 and the tip part of the laser receiving part 33 is kept constant. and the tip of the laser light receiving part 33 are brought into contact with the packaging container H, so that the measured distance of the packaging container H between the laser light emitting part 31 and the laser light receiving part 33 of the packaging container H to be sequentially measured is kept constant. and the concentration of the specific gas in the packaging container H is measured.

The oxygen concentration measuring apparatus of this embodiment measures the oxygen concentration in the sealed packaging container H, which is gas-substituted with an inert gas such as nitrogen or carbon dioxide, by means of a laser type gas concentration meter M. be.

The laser type gas concentration meter M utilizes infrared absorption spectroscopy using a semiconductor laser as the light source. It displays.

Specifically, the laser beam oscillated from the transmitter 30 of the laser generator 31 passes through the tip of the laser generator 31, enters the packaging container H, and is received by the receiver 32 of the laser receiver 33. configured to be The laser light of a specific wavelength oscillated from the oscillator 30 is selected from the wavelength (natural frequency) range of 760 to 770 nm in the case of oxygen gas. Then, when the laser beam of the specific wavelength is absorbed by the oxygen gas remaining in the packaging container H, the laser beam received by the receiver 32 of the laser light receiving unit 33 is absorbed into the package H based on the absorbance of the laser beam. The gas concentration of residual oxygen gas is configured to be measured.

In the oxygen concentration measuring apparatus G for a packaging container of this embodiment, the separation distance between the tip of the laser emitting part 31 and the tip of the laser receiving part 33 is maintained at a constant distance. By bringing the tip end portion and the tip end portion of the laser light receiving portion 33 into contact with the packaging container H, the measurement distance of the packaging container H between the laser emitting portion 31 and the laser light receiving portion 33 is kept constant. It is configured such that it is held and the concentration of the specific gas in the packaging container H is measured.

The tip portion of the laser emitting portion 31 and the tip portion of the laser receiving portion 33 of this embodiment are configured to be able to approach and separate from each other. Specifically, the laser emitting portion 31 of this embodiment is fixed to a cylinder base 34, and a cylinder 35 is arranged below the cylinder base 34. By means of this cylinder 35, the cylinder base 34 and the laser emitting portion 31 is configured to be able to reciprocate left and right in FIG. On the other hand, the laser receiving portion 33 of this embodiment is fixed to a cylinder base 36, and a cylinder 37 is arranged below the cylinder base 36. The cylinder base 36 and the tip portion of the laser receiving portion 33 are supported by the cylinder 37. is configured to reciprocate left and right in FIG.

The distal end portion of the laser emitting portion 31 and the distal end portion of the laser receiving portion 33 of this embodiment are configured so as to be relatively close to each other and separated from each other by the action of the cylinders 35 and 37 as described above. , the distance between the tip of the laser emitting portion 31 and the tip of the laser receiving portion 33 can be maintained at a set constant distance. However, the oxygen concentration measuring device G in the present invention is not limited to this. and the tip of the laser light receiving portion may be maintained at a constant distance.

The tip surfaces of the laser emitting part 31 and the laser receiving part 33 are open, and the inside of the laser path (not shown) between the laser emitting part 31 and the laser receiving part 33 is not shown before the laser irradiation after contacting the packaging container H. It is preferable that a suction mechanism (not shown) is provided so as to create a vacuum atmosphere. Furthermore, a tank (not shown) filled with nitrogen gas is attached to the laser path through a flow control valve (not shown) and a flow meter (not shown), and nitrogen gas is supplied to reduce residual oxygen in the laser path. The ratio may be set to approximately 0% to further improve the measurement accuracy.

The pair of clamping members 38 and 39 are for bringing the tip of the laser emitting portion 31 and the tip of the laser receiving portion 33 into contact with the packaging container H. In this embodiment, as shown in FIG. In addition, they are arranged below the laser emitting portion 31 or the laser receiving portion 33 and on both sides of the packaging container H, respectively. The clamping body 39 is configured to be reciprocable in the horizontal direction in FIG. 4 by a cylinder 40. When the clamping body 39 moves leftward in FIG. The upper portion of the packaging container H expands in the left-right direction along with this action, and the tip of the laser emitting portion 31 and the tip of the laser receiving portion 33 are configured to abut against the packaging container H, respectively. there is

As described above, the packaging container H is clamped by the pair of clamping bodies 38 and 39 while the distance between the tip of the laser emitting portion 31 and the tip of the laser receiving portion 33 is kept constant. As a result, the tip of the laser emitting part 31 and the tip of the laser receiving part 33 come into contact with the packaging container H, respectively, so that the distance between the laser emitting part 31 and the laser receiving part 33 of the packaging container H that is sequentially measured. The measured distance is held constant. As a result, there is no variation in the distance of the object to be measured between the laser emitting section 31 and the laser receiving section 33, and the measurement accuracy can be improved.

The gas replacement device 50 of this embodiment is provided near the station 7, as shown in FIG. 3, and replaces the air in the packaging container H with an inert gas. As shown in FIG. 3 or 5, the inert gas is supplied from the outside through the inert gas input port 54, and is suspended from the grip pair g through the gas nozzle 55 under the control of the flow rate controller 52. It is constructed such that the air in the packaging container H is replaced with inert gas by flowing into the packaging container H which is supported by and sequentially sent.

Next, the characteristic function of the packaging machine P of the present invention (an embodiment of the oxygen concentration control method in the packaging container of the present invention) will be described.
The packaging machine P of the present invention, as shown in FIG. Step S2 in which the control unit 70 determines whether or not there is an upward trend, and when the control unit 70 determines that the oxygen concentration measurement value is in an increasing trend, the control unit 70 causes the gas replacement gas device 50 to increase the flow rate of the replacement gas. and a step S4 of increasing the flow rate of the replacement gas by the flow rate controller 52. The oxygen concentration control is performed.

Specifically, as shown in FIG. 1, when the packaging machine P of this embodiment is started up, the oxygen concentration measuring device G measures the product through the filling process, the gas replacement process, and the sealing process of the product to be packaged. The oxygen concentration in the packaging container H of the product thus produced is sequentially measured, and the oxygen concentration measurement values in the packaging container H are transmitted to and stored in the control unit (PLC in this embodiment) 70 (step S1).

Then, the control unit 70 determines whether or not the oxygen concentration measurement value is on an upward trend based on the oxygen concentration measurement values in the packaging containers H that are sequentially sent (step S2). Specifically, as shown in FIG. 2, the control unit 70 of the packaging machine P of this embodiment sets the oxygen concentration measurement value to a value lower than the shipping standard value (required oxygen concentration, for example, 3%). It is determined that there is an upward trend when the set value (for example, oxygen concentration of 2.7%) is reached. As a result, the oxygen concentration in the packaging container H is controlled before the oxygen concentration measurement value reaches the shipping standard value, thereby further preventing the production of products in which the concentration of oxygen remaining in the packaging container H is outside the standard value. can do.

Further, it is preferable that the determination of whether or not the oxygen concentration measurement value by the control unit 70 is on an upward trend is made based on a plurality of set oxygen concentration measurement values. Specifically, in this embodiment, the control unit 70 determines that there is an upward trend when 10 products rise continuously. As a result, if for some reason the measured oxygen concentration of only one product (single shot) suddenly rises, the oxygen concentration control shown in the flow chart of this figure is not performed, and the measured oxygen concentration rises. It is configured so that it can be determined more accurately whether or not there is a tendency. The number of multiple oxygen concentration measurements can be set as appropriate, and discontinuous multiple times (e.g., multiple skipping times) are not necessarily excluded, but from the viewpoint of accuracy, continuous multiple products is preferably set to

When the controller 70 determines that the measured value of oxygen concentration tends to increase, the controller 70 instructs the gas replacement gas device 50 to increase the flow rate of the replacement gas (step S3). As a result, oxygen concentration control is performed by the flow controller 52 to increase the flow rate of the replacement gas, and a larger amount of the inert gas flows into the packaging container H to lower the oxygen concentration (step S4).

On the other hand, if the control unit 70 does not determine that the oxygen concentration measurement value is on an upward trend, the above-described step S3 and subsequent steps are not performed, and the operation continues.

Further, even after step S4 in which the flow rate of the replacement gas is increased by the flow rate controller 52, the oxygen concentration measurement of the product packaging container H is continued, and the control unit determines whether the oxygen concentration measurement value is on an upward trend. Step S5 determined by 70 is performed. In this step S5, the control unit 70 makes the same determination as in step S2, and as long as it determines that the measured value of oxygen concentration tends to increase, the control unit 70 instructs to increase the flow rate of the replacement gas in the gas replacement process in step S3. Then, the step S4 of increasing the flow rate of the replacement gas by the flow rate controller 52 is repeated. As a result, while the oxygen concentration measurement value is on an upward trend, the oxygen concentration control is repeatedly performed so that the oxygen concentration in the packaging container H is reliably normalized.

As described above, according to the packaging machine P of the present invention, feedback control (residual oxygen concentration control) is performed based on the measured value of oxygen concentration. This prevents products from being produced in large quantities.

In addition, in one embodiment of the feedback control (residual oxygen concentration control) based on the oxygen concentration measurement value in the packaging machine P of the embodiment of the present invention or the method of controlling the oxygen concentration in the packaging container of the present invention, the control unit When 70 judges that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container H, the step of instructing the control unit 70 to increase the flow rate of the replacement gas in the gas replacement process, and the step of the flow rate controller 52 and increasing the flow rate of the replacement gas by, but the invention is not limited to this.

For example, when the control unit 70 determines that the measured value of oxygen concentration tends to increase, the step of lowering the residual oxygen concentration in the packaging container H is performed by the control unit 70 so as to lower the position of the gas nozzle 55 in the packaging container H in the gas replacement step. It may have a step of indicating and a step of lowering the position of the gas nozzle 55 in the packaging container H, and such is also included in the scope of the present invention.

Specifically, the gas nozzle 55 of the gas replacement device 50 is provided in a nozzle elevating section (not shown) so that it can be raised and lowered. is controlled to lower the gas nozzle 55 deeper into the packaging container H. As a result, gas replacement is performed up to the oxygen at the bottom of the packaging container H, thereby acting to lower the residual oxygen concentration.

Further, when the control unit 70 determines that the measured value of the oxygen concentration is on an upward trend, the step of decreasing the residual oxygen concentration in the packaging container H is the number of rotations of the packaging machine P (for example, the number of rotations of the moving body 53 per unit time). (packaging capacity [bpm: number of bags produced per minute]) is instructed by the control unit 70; It may have, and such a thing is also included in the scope of the present invention.

G Oxygen concentration measuring device M Laser type gas concentration meter P Packaging machine H Packaging container g Grip pairs 1 to 10 Each packaging station 20 Filling device 30 Transmitter 31 Laser transmitter 32 Receiver 33 Laser receiver 34 Cylinder base 35 Cylinder 36 Cylinder Base 37 Cylinders 38, 39 Paired clamping body 40 Cylinder 50 Gas replacement device 51 Machine base 52 Flow controller 53 Disk-shaped rotating body (moving body)
54 Inert gas input port 55 Gas nozzle 60 Seal device 70 Control unit 80 Seal cooling device

Claims (14)

Sequentially measuring the oxygen concentration in the packaging container of the product produced through at least the filling process, the gas replacement process, and the sealing process of the item to be packaged, and transmitting the sequentially measured oxygen concentration measurement values in the packaging container to the control unit. a step of determining by the control unit whether or not the measured value of oxygen concentration is on an upward trend; and a step of determining by the control unit whether the measured value of oxygen concentration is on an upward trend; and a step of reducing the residual oxygen concentration. When the control unit determines that the oxygen concentration measurement value is on an upward trend, the step of decreasing the residual oxygen concentration in the packaging container instructs the control unit to increase the flow rate of the replacement gas in the gas replacement step. and increasing the flow rate of the replacement gas by means of a flow rate controller. When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the control to lower the position of the gas nozzle in the packaging container in the gas replacement step. 2. The method for controlling oxygen concentration in a packaging container according to claim 1, further comprising the step of instructing by a part, and the step of lowering the position of the gas nozzle in the packaging container. When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the step of instructing the control unit to lower the rotation speed of the packaging machine; 2. The method for controlling oxygen concentration in a packaging container according to claim 1, further comprising the step of decreasing the number of revolutions of the packaging machine and increasing the replacement gas filling time in said packaging container. Judgment by the control unit as to whether or not the measured oxygen concentration value is on an upward trend is determined to be on an upward trend when the measured oxygen concentration value reaches a set value that is lower than the shipping standard value. The oxygen concentration control method in a packaging container according to any one of claims 1 to 4. 6. The inside of the packaging container according to any one of claims 1 to 5, wherein the determination of whether or not the oxygen concentration measured value is on an upward trend by the control unit is determined based on a plurality of set oxygen concentration measured values. oxygen concentration control method. When the control unit determines that the measured oxygen concentration value is on an upward trend, after the step of decreasing the residual oxygen concentration in the packaging container, the control unit determines whether the measured oxygen concentration value is on an upward trend. 7. Any one of claims 1 to 6, wherein the step of determining is performed and the step of decreasing the residual oxygen concentration in the packaging container is repeated as long as the controller determines that the measured oxygen concentration is trending upward. A method for controlling the oxygen concentration in the described packaging container. A filling device for filling a packaging container with an object to be packaged, a gas replacement device for replacing air in the packaging container with an inert gas, a sealing device for sealing the packaging container, and a packaging object. and an oxygen concentration measuring device for sequentially measuring the oxygen concentration in the packaging container of the product produced through the product filling process, the gas replacement process, and the sealing process, wherein the packaging machine measures the oxygen concentration a step of transmitting the measured values of oxygen concentration in the packaging container sequentially measured by the concentration measuring device to a control unit; a step of determining by the control unit whether or not the measured values of oxygen concentration tend to increase; and a step of reducing the oxygen concentration remaining in the packaging container when the department determines that the measured value of oxygen concentration tends to increase. When the control unit determines that the oxygen concentration measurement value is on an upward trend, the step of decreasing the residual oxygen concentration in the packaging container instructs the control unit to increase the flow rate of the replacement gas in the gas replacement step. 9. The packaging machine of claim 8, comprising the steps of: and increasing the flow rate of the replacement gas by means of a flow controller. When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the control to lower the position of the gas nozzle in the packaging container in the gas replacement step. 9. The packaging machine according to claim 8, comprising the step of directing a part and lowering the position of the gas nozzle within the packaging container. When the control unit determines that the measured value of oxygen concentration is on an upward trend, the step of lowering the residual oxygen concentration in the packaging container includes the step of instructing the control unit to lower the rotation speed of the packaging machine; 9. The packaging machine according to claim 8, further comprising the step of decreasing the number of revolutions of the packaging machine and increasing the replacement gas filling time in the packaging container. Judgment by the control unit as to whether or not the measured oxygen concentration value is on an upward trend is determined to be on an upward trend when the measured oxygen concentration value reaches a set value that is lower than the shipping standard value. 12. A packaging machine according to any one of claims 8 to 11. 13. The packaging machine according to any one of claims 8 to 12, wherein the controller determines whether or not the oxygen concentration measured value is on the rise based on a plurality of set oxygen concentration measured values. When the control unit determines that the measured oxygen concentration value is on an upward trend, after the step of decreasing the residual oxygen concentration in the packaging container, the control unit determines whether the measured oxygen concentration value is on an upward trend. 14. Any one of claims 1 to 13, wherein the step of determining is performed and the step of decreasing the residual oxygen concentration in the packaging container is repeated as long as the controller determines that the measured oxygen concentration is trending upward. The described packaging machine.

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