JP2023131841A - Thickness measurement device for serial packaging bag - Google Patents

Abstract

To provide a thickness measurement device for a serial packaging bag which is advantageous in accurately measuring a thickness of a bag body of the serial packaging bag.SOLUTION: An optical detection unit 34 detects a tip of a serial packaging bag 10 and a perforation 16 in a conveyance direction and determines a timing of a detection operation of each bag body 12 by a thickness detection unit 32 based on this detection result, the length of a bag body 12 along the conveyance direction, and a conveyance speed. The thickness detection unit 32 can detect a thickness at a longitudinal center of each bag body 12 even if a phenomenon occurs that the serial packaging bag 10 bends at a seal part 14, so that it is advantageous in accurately measuring the thickness of the bag body 12 of the serial packaging bag 10.SELECTED DRAWING: Figure 2

Description

The present invention relates to an apparatus for measuring the thickness of continuous packaging bags.

A continuous packaging bag is constructed by connecting a plurality of bags each containing a product through a seal.
Continuous packaging bags are manufactured by storing the product in a bag body using a bag-forming-filling-sealing machine, and then transported from the bag-forming-filling-sealing machine to a discharge conveyor via a discharge chute, and then transported to a first transport conveyor. The weight of each bag is measured by a weight checker while being transported on the first transport conveyor, and then the thickness of each bag is measured by being transported from the first transport conveyor to a second transport conveyor equipped with a thickness measuring device. is measured.
In this case, on each conveyor, the continuous packaging bag is conveyed in the length direction in which a plurality of bags are connected.
Patent Document 1 discloses a method for detecting the leading edge of a multi-pack bag in the conveying direction on a second conveyor, and setting a measurement timing for measuring the thickness of the bag based on the conveying speed and the length of each bag. Techniques for determining this have been proposed.

JP 2021-123398 Publication

By the way, the multi-pack bags are discharged by their own weight from the discharge chute extending in the vertical direction toward the discharge conveyor extending in the substantially horizontal direction. A phenomenon called jamming, where the sheet bends at the boundary, is likely to occur.
Further, in order to accurately measure the weight using the weight checker, the conveyance speed of the first conveyor is often lower than the conveyance speed of the discharge conveyor. Therefore, even if the conveyance speed suddenly decreases when the multi-pack bag moves from the discharge conveyor to the first transport conveyor, the same phenomenon as described above in which the multi-pack bag bends at the sealing part is likely to occur.
When such bending occurs, the positional relationship of each bag body with respect to the tip of the multi-pack bag in the transport direction is not constant and varies, compared to a case where no bending occurs.
Therefore, as in the prior art described above, the leading edge of the multi-pack bag in the transport direction is detected, and the measurement timing for measuring the thickness of the bag is determined based on the transport speed and the length of each bag. However, the measurement timing for each bag may not be optimal, and the thickness may be measured at a location away from the center of the bag, resulting in a decrease in thickness measurement accuracy.
The present invention has been devised in view of the above circumstances. SUMMARY OF THE INVENTION An object of the present invention is to provide a multi-pack bag thickness measuring device that is advantageous in accurately measuring the thickness of a multi-pack bag body.

In order to achieve the above-mentioned object, one embodiment of the present invention provides a device for measuring the thickness of a multi-pack bag, which is configured by connecting a plurality of bags housing products through a seal portion having perforations. a conveyance unit that conveys the continuous packaging bag in a direction in which the plurality of bag bodies are connected at a preset conveyance speed; and the plurality of bag bodies of the continuous packaging bag that are conveyed through the conveyance unit. a thickness detecting section that detects the thickness of the continuous packaging bag, and a thickness detection section that is provided upstream of the thickness detection section in the conveyance direction of the continuous packaging bag, and irradiates the continuous packaging bag with detection light and a light detection unit that detects the intensity of the detection light that is transmitted or reflected; and a photodetector that detects the tip of the multi-pack bag and the perforation in the transport direction based on the intensity of the detection light; The present invention is characterized by comprising a control section that determines the timing of the detection operation of each bag body by the thickness detection section based on the result, the length of the bag body along the conveyance direction, and the conveyance speed.
Further, in an embodiment of the present invention, the thickness detection section includes a movable body formed to be able to move up and down in the thickness direction of the bag body and press the upper surface of the bag body, and a movable body that moves up and down the movable body. an electric motor; and the electric motor is controlled based on the timing determined by the control unit, and the electric motor is controlled by the movable body based on the torque load of the electric motor when the movable body is pressed against the upper surface of the bag body. The present invention is characterized in that it includes a motor control section that controls the pressing force on the bag, and a thickness calculation section that calculates the thickness of the bag based on the amount of rotation of the electric motor.
Further, in an embodiment of the present invention, the photodetecting section is a transmission type photoelectric sensor including a light emitting section that irradiates the detection light and a light receiving section that detects the detection light that has passed through the continuous packaging bag. It is characterized by being configured.
Further, an embodiment of the present invention is characterized in that the multi-package bag is formed of an opaque packaging film.
Moreover, one embodiment of the present invention is characterized in that the product is a snack food.

According to an embodiment of the present invention, the optical detection unit detects the leading edge and perforation of the multi-pack bag in the transport direction, and also compares the detection result with the length of the bag in the transport direction and the transport speed. The timing of the detection operation of each bag body by the thickness detection section is determined based on this.
Therefore, even if the multi-pack bag bends at the sealing part, the thickness detection unit can detect the thickness at the longitudinal center of each bag. This is advantageous in accurately measuring thickness.
In addition, the pressing force of the moving object on the bag is controlled based on the torque load of the electric motor when the moving object is pressed against the top surface of the bag, and the thickness of the bag is controlled based on the amount of rotation of the electric motor. By calculating this, the measurement conditions for the bag thickness can be maintained constant by appropriately setting the pressing force applied to the bag body from the moving object, making it possible to accurately measure the thickness of the bag body of multi-pack bags. It is advantageous to do so.
Furthermore, if the photodetection section is configured with a transmission type photoelectric sensor that includes a light emitting section that irradiates detection light and a light reception section that detects the detection light that has passed through the multi-pack bag, the configuration of the thickness detection device can be simplified. This will be advantageous in terms of planning.
Furthermore, if the multi-pack bag is made of an opaque packaging film, it is advantageous for the photodetector to more reliably detect the end of the multi-pack bag in the transport direction and the perforation.
In addition, if the product is a snack food, it is possible to determine whether or not the amount of air contained in the bag is appropriate by detecting the thickness of the bag containing the snack food. This is advantageous in ensuring that the multi-pack bag is accommodated in the cardboard box while preventing damage to the multi-pack bag.

FIG. 3 is an explanatory diagram showing a process in which a continuous bag discharged from the bag making, filling and packaging machine is conveyed to the thickness measuring device of the present embodiment. (A) is a side view showing the configuration of a continuous bag thickness measuring device according to an embodiment, and (B) is a plan view of (A). FIG. 2 is a block diagram showing the configuration of a thickness detection section.

Embodiments of the present invention will be described below with reference to the drawings.
First, the continuous packaging bag 10 will be explained with reference to FIGS. 2(A) and 2(B).
The continuous packaging bag 10 is constructed by connecting a plurality of bags 12 containing products through a seal portion 14.
In this embodiment, the multi-pack bag 10 is formed of an opaque packaging film, and an aluminum vapor-deposited film with light-shielding properties is used as the packaging film to prevent products such as snacks from oxidizing. .
The continuous packaging bag 10 has a length in the direction in which the plurality of bags 12 are connected, and the bag bodies 12 and the seal portion 14 have a length along the length direction of the continuous packaging bag 10. Seal portions 14 are located at both ends of 12 in the length direction.
A perforation 16 is provided in the longitudinally intermediate portion of the seal portion 14 to allow the bag 12 to be broken.
The dimensions of adjacent perforations 16 in the length direction of the continuous packaging bag 10, in other words, the length of each bag body 12 are the same.
In this embodiment, the continuous packaging bag 10 is configured by four bag bodies 12 connected via three seal parts 14, and the seal parts 14 are located at both ends of the continuous packaging bag 10 in the length direction. ing.
A header part 18 in which a hole 18A for hanging the multi-pack bag 10 at a store etc. is formed is provided in the seal part 14 at one end in the length direction of the multi-pack bag 10. 10 is called a continuous bag with a header.
Therefore, the header part 18 is located at one end in the length direction of the multi-pack bag 10, and the seal part 14 is located at the other end in the length direction.
It should be noted that the present invention is of course applicable to multi-pack bags that are not provided with the header section 18.
The product accommodated in the bag body 12 is, for example, a snack food such as potato chips, but the type of product is not limited. In addition, air is accommodated in the bag body 12 together with the product by a bag making, filling and packaging machine 20, which will be described later, so that the bag body 12 is inflated to some extent. This is to protect the product by ensuring the thickness of the bag body 12 with air to reduce impact during transportation.

As shown in FIG. 1, the continuous packaging bag 10 is manufactured by storing the product together with air in each bag body 12 by a bag-forming-fill-sealing machine 20, and then transported from a discharge chute 22 extending in a substantially vertical direction. Due to its own weight, the multi-pack bag 10 is discharged onto a discharge conveyor 24 which extends with a gentle slope and increases in height as it reaches the downstream side.
In addition, in the figure, the reference numeral 20A indicates a horizontal seal portion of the bag making, filling and packaging machine 20, and the seal portion 14 of the multi-pack bag 10 is formed by the horizontal seal portion 20A.
Further, in the continuous packaging bag 10, the header part 18 at one end in the length direction of the continuous packaging bag 10 is located at the upstream end in the conveyance direction, and the other longitudinal end of the continuous packaging bag 10 is located at the downstream end in the conveyance direction. is discharged onto the discharge conveyor 24 such that the seal portion 14 is located.
A first conveyor 26A constituting the weight checker 26 is arranged downstream of the discharge conveyor 24 in the conveyance direction, and while one continuous bag 10 is conveyed on the first conveyor 26A, one The weight of one continuous bag 10 is measured.
It is determined whether the weight of the multi-pack bag 10 measured by the weight checker 26 is within a predetermined passing range. If the weight of the multi-pack bag 10 is not within the pass range, it is considered a defective product, and the product is sent to a defect elimination section to be described later. excluded by 50.

As shown in FIG. 1, the multi-pack bag 10 is discharged downward by its own weight from the discharge chute 22 extending in a substantially vertical direction, and the multi-pack bag 10 is jammed and bent at the seal portion 14 on the discharge conveyor 24. A phenomenon known as this is likely to occur.
In addition, in order to ensure the accuracy of weight measurement by the weight checker 26, the conveyance speed of the first conveyor 26A is set to be lower than the conveyance speed of the discharge conveyor 24. If the conveyance speed suddenly decreases when the bag is moved from the bag to the first conveyor 26A, the same phenomenon as described above is likely to occur, in which the multi-pack bag 10 bends at the seal portion 14.
In addition, in the figure, the straight line α indicates the position of the seal portion 14 in the thickness direction when the continuous packaging bag 10 is not bent.

As shown in FIGS. 2A and 2B, the multi-pack bag thickness measuring device 28 of this embodiment includes a second conveyor 30 (transport section), a thickness detection section 32, and a photodetector. It is configured to include a section 34 and a control section 36.
The second conveyor 30 conveys the multiple bags 10 conveyed from the first conveyor 26A at a preset conveyance speed in the direction in which the plurality of bags 12 are connected.
In this embodiment, a gap S is formed between the downstream end of the first transport conveyor 26A and the upstream end of the second transport conveyor 30.
In addition, in the figure, the reference numeral 52 indicates the third conveyor of the defect eliminating section 50 connected to the downstream side of the second conveyor 30 in the conveying direction.

The thickness detection unit 32 detects the thickness of each of the plurality of bags 12 of the multi-pack bag 10 being conveyed on the second conveyor 30.
As shown in FIG. 3, the thickness detection section 32 includes a moving body 38, an electric motor 40, a motor control section 42, and a thickness calculation section 44.
As shown in FIG. 2(A), the moving body 38 has a pressing surface 3802 having a length along the conveyance direction of the second conveyor 30 and a width in a direction perpendicular to the length.
The movable body 38 is configured to move up and down in the thickness direction of the bag 12 and to press the top surface of the bag 12 using a pressing surface 3802.
The movable body 38 has, for example, a large number of free rollers (not shown) provided on the pressing surface 3802 so as to be rotatable along the conveying direction of the multi-pack bag 10, and the upper surface of the bag body 12 of the multi-pack bag 10 being transported. Even if pressed by the pressing surface 3802, the free roller rotates following the multi-pack bag 10, so that the conveyance of the multi-pack bag 10 is not hindered.
Furthermore, as will be described later, when the longitudinal center of the pressing surface 3802 of the movable body 38 presses the longitudinal center of the upper surface of the bag 12 in the conveyance direction, the thickness of the bag 12 is at its maximum. It is designed to ensure accurate measurements.

The electric motor 40 moves the movable body 38 up and down via a power transmission mechanism (not shown), and is composed of, for example, a servo motor capable of servo control.
The motor control section 42 controls the rotation of the electric motor 40 based on timing determined by a control section 36, which will be described later.
Further, the motor control unit 42 controls the pressing force of the movable body 38 on the bag body 12 based on the torque load of the electric motor 40 when the movable body 38 is pressed against the upper surface of the bag body 12.
The pressing force is controlled to a predetermined constant value, thereby maintaining the measurement conditions for the thickness of the bag 12 constant.

The thickness calculation unit 44 calculates the thickness of the bag 12 based on the amount of rotation of the electric motor 40.
For example, the thickness calculation unit 44 counts drive pulses corresponding to the amount of rotation of the electric motor 40 supplied from the motor control unit 42, and adjusts the speed of the second conveyor 30 of the movable body 38 based on the count result of the drive pulses. The height position from the top surface, that is, the thickness of the bag body 12 is calculated.
Note that it is determined whether the calculated thickness of the bag 12 is within a predetermined acceptable range, and if the thickness of the bag 12 is not within the acceptable range, the multi-pack bag 10 is determined to be a defective product, and the defective product is excluded. section 50.

As shown in FIG. 2(A), the light detection unit 34 is provided upstream of the thickness detection unit 32 in the conveyance direction of the multi-pack bag 10, and irradiates the multi-pack bag 10 with detection light L. This is to detect the intensity of the detection light L that is transmitted or reflected through the continuous packaging bag 10.
In the present embodiment, the photodetection section 34 is a transmission type photoelectric sensor including a light emitting section 46 and a light receiving section 48 arranged to sandwich the gap S between the first conveyor 26A and the second conveyor 30 from above and below. It consists of
The light emitting section 46 is for emitting detection light L toward the multi-pack bag 10, and the light receiving section 48 is for detecting the detection light L that has passed through the multi-pack bag 10.
Note that the shape and number of detection lights L emitted from the light emitting part 46 are not limited, but in order to reliably detect the perforation 16, for example, a plurality of detection lights L are emitted along the length direction of the perforation 16. It is preferable that detection light (light beam) L is irradiated.
Therefore, various conventionally known transmission type photoelectric sensors such as an area sensor having a plurality of optical axes can be used as the photodetector 34.
The detection light L passes through the perforations 16 in the multi-pack bag 10, while the detection light L does not pass through the parts of the multi-pack bag 10 other than the perforations 16 because they are formed of an opaque packaging film. .
Therefore, the intensity of the detection light L detected by the light detection unit 34 has a maximum value when the continuous packaging bag 10 is not present, and has a minimum value at a portion of the continuous packaging bag 10 other than the perforation 16. It becomes an intermediate value in some parts.
Therefore, the intensity of the detection light L changes from the maximum value to the minimum value at the leading end of the multi-pack bag 10 in the conveying direction, and also changes from the minimum value to the intermediate value and from the intermediate value to the minimum value before and after the perforation 16. Since the intensity of the detection light L changes, it becomes possible to detect the leading end of the multi-pack bag 10 in the transport direction and the perforation 16 based on the intensity of the detection light L.
Note that even if the multi-pack bag 10 is made of a transparent packaging film, the amount of transmitted detection light L is lower in the packaging film than in the case where there is no packaging film, so the same method as above is applied. The perforations 16 can be detected in principle.

The control unit 36 detects the tip of the multi-pack bag 10 and the perforation 16 in the transport direction based on the intensity of the detection light L, and uses this detection result, the length A of the bag body 12, and the second The timing of the detection operation of each bag 12 by the thickness detection section 32 is determined based on the conveyance speed V of the conveyor 30.
More specifically, the detection result, the length A (cm) of the bag body 12, the conveyance speed V (cm/sec) of the second conveyor 30, and the detection light along the conveyance direction of the second conveyor 30 The timing of the detection operation of each bag 12 by the thickness detection section 32 is determined based on L and the distance B (cm) from the center of the pressing surface 3802 of the moving body 38 in the longitudinal direction.
That is, assuming that the timing at which the detection operation is performed is T seconds based on the time when the leading edge or perforation 16 of the multi-pack bag 10 is detected, the timing T is calculated using the following equation (1).
T=((A/2)+B)/V (seconds)...(1)
That is, the control unit 36 instructs the motor control unit 42 of the thickness detection unit 32 regarding the timing of the detection operation of the bag 12.
As a result, the motor control unit 42 can move between an upper standby position where the pressing surface 3802 of the moving body 38 is spaced upward from the multi-pack bag 10 and a lower position where the pressing surface 3802 of the moving body 38 presses the bag 12 with a predetermined pressing force. The thickness of each bag 12 is calculated by the thickness calculating section 44 for each bag 12 by raising and lowering the bag 12 between the pressing position and the pressing position.
By setting the timing of the detection operation of each bag 12 to the timing at which the center of the pressing surface 3802 of the movable body 38 presses the center of the length of each bag 12 in the transport direction by the second transport conveyor 30. , the thickness of the bag body 12 is designed to be measured with the highest accuracy.

Next, the effects of this embodiment will be explained.
According to the present embodiment, the optical detection unit 34 detects the tip of the multi-pack bag 10 and the perforation 16 in the transport direction, and also uses this detection result to determine the length of the bag 12 in the transport direction and the transport speed. The timing of the detection operation of each bag 12 by the thickness detecting section 32 is determined based on the above.
Therefore, even if the continuous packaging bag 10 bends at the seal portion 14, the thickness of each bag body 12 at the center in the length direction can be detected by the thickness detection unit 32. This is advantageous in accurately measuring the thickness of the 10 bags 12.

Further, in the present embodiment, the thickness detection unit 32 calculates the pressing force applied to the bag body 12 by the movable body 38 based on the torque load of the electric motor 40 when the movable body 38 is pressed against the top surface of the bag body 12. At the same time, the thickness of the bag body 12 is calculated based on the amount of rotation of the electric motor 40.
Therefore, by appropriately setting the pressing force applied from the movable body 38 to the bag body 12, the measurement conditions for the thickness of the bag body 12 can be maintained constant, so that the thickness of the bag body 12 of the multi-pack bag 10 can be accurately determined. This is advantageous for measurement.

Furthermore, in the present embodiment, the light detection section 34 is constituted by a transmission type photoelectric sensor that includes a light emitting section 46 that irradiates the detection light L and a light receiving section 48 that detects the detection light L that has passed through the multi-pack bag 10. This is advantageous in simplifying the configuration of the thickness detection device.
Note that the light detection section 34 may be constituted by a reflective photoelectric sensor including a light emitting section 46 that emits the detection light L and a light receiving section 48 that detects the detection light L reflected from the multi-pack bag 10.
In this case, the detection light L is reflected at a constant rate in the portions of the multi-pack bag 10 other than the perforations 16, while a portion of the detection light L is transmitted through the perforations 16 at the perforations 16. Therefore, the intensity of the reflected detection light L decreases.
Therefore, the intensity of the detection light L detected by the light detection unit 34 has a minimum value when the continuous packaging bag 10 is not present, has a maximum value at a portion of the continuous packaging bag 10 other than the perforation 16, and has a maximum value at a portion of the continuous packaging bag 10 other than the perforation 16. It becomes an intermediate value in some parts.
Therefore, the intensity of the detection light L changes from the minimum value to the maximum value at the leading end of the multi-pack bag 10 in the conveying direction, and also changes from the maximum value to the intermediate value and from the intermediate value to the maximum value before and after the perforation 16. Based on the intensity of the detection light L, it is possible to detect the perforation 16 at the leading end of the continuous packaging bag 10 in the transport direction.
However, when a reflective photoelectric sensor is used as the light detection unit 34, the intensity of the detection light L reflected by the continuous packaging bag 10 is easily influenced by the surface condition of the continuous packaging bag 10. It is conceivable that the process for determining the intensity of the detection light L reflected by the perforation 16 and the intensity of the detection light L reflected by the perforation 16 becomes somewhat complicated.
Therefore, if a transmission type photoelectric sensor is used as the photodetector 34 as in this embodiment, the photodetector 34 can detect the tip of the multi-pack bag 10 and the perforation 16 in the transport direction with a simple configuration. It is more advantageous to do so.

In addition, in this embodiment, since the multi-pack bag 10 is made of an opaque packaging film, the light detecting section 34 is When a transmission type sensor is used, while the detection light L passes through the perforation 16, the detection light L is not transmitted through the parts of the continuous packaging bag 10 other than the perforation 16, so that the light detection unit 34 detects the continuous packaging in the transport direction. This is advantageous in that the tip of the packaging bag 10 and the perforation 16 can be detected more reliably.

Furthermore, in this embodiment, since the product is a snack food, each bag body 12 accommodates the snack food together with an appropriate amount of air.
This is because if the amount of air accommodated in the bag body 12 is too small, the snack food will be easily broken due to vibrations and shocks during transportation, and if the amount of air accommodated in the bag body 12 is too large, it will cause problems. This is because when storing the packaging bag 10 in a cardboard box, there is a disadvantage that the multiple packaging bag 10 cannot be completely accommodated in the cardboard box, so it is necessary to store an appropriate amount of air in the bag body 12.
In this embodiment, by detecting the thickness of the bag 12 containing such snack food, it is possible to determine whether the amount of air stored in the bag 12 is appropriate. This is advantageous in ensuring that the continuous packaging bag 10 is housed in the cardboard box while preventing damage to the snack food.

In the present embodiment, a case has been described in which the thickness detection unit 32 measures the thickness of the bag 12 based on the amount of movement of the moving body 38; Alternatively, for example, a non-contact type (photoelectric type) thickness sensor may be used to measure the thickness of the bag body 12. In that case, the function of calculating the thickness of the bag body 12 based on the amount of rotation of the electric motor 40 becomes unnecessary.
Similar to the present embodiment, this configuration is also advantageous in accurately measuring the thickness of the bag body 12 of the multi-pack bag 10.

10 Continuous packaging bag 12 Bag body 14 Sealing part 16 Perforation 18 Header part 18A Hole 20 Bag making, filling and packaging machine 20A Horizontal sealing part 22 Discharge chute 24 Discharge conveyor 26 Weight checker 26A First conveyor 28 Thickness measurement of continuous packaging bag Device 30 Second conveyor (transport section)
32 Thickness detecting section 34 Photo detecting section 36 Control section 38 Moving body 3802 Pressing surface 40 Electric motor 42 Motor control section 44 Thickness calculating section 46 Light emitting section 48 Light receiving section 50 Third conveyor L Detection light S Gap

Claims (5)

A device for measuring the thickness of a continuous bag, which is configured by connecting a plurality of bags containing products through a seal portion having perforations, the device comprising:
a conveyance unit that conveys the continuous packaging bag in a direction in which the plurality of bags are connected at a preset conveyance speed;
a thickness detection unit that detects the thickness of each of the plurality of bag bodies of the continuous packaging bag that is transported through the transport unit;
It is provided on the upstream side of the thickness detection unit in the transport direction of the multi-pack bag, and irradiates the multi-pack bag with detection light and detects the intensity of the detection light that is transmitted through or reflected from the multi-pack bag. a light detection section;
Based on the intensity of the detection light, the leading end of the multi-pack bag and the perforation in the transport direction are detected, and this detection result is combined with the length of the bag along the transport direction and the transport speed. a control unit that determines the timing of the detection operation of each bag body by the thickness detection unit based on;
A device for measuring the thickness of continuous packaging bags. The thickness detection section is
a movable body configured to move up and down in the thickness direction of the bag and press the top surface of the bag;
an electric motor that raises and lowers the moving body;
The electric motor is controlled based on the timing determined by the control unit, and the movable body is applied to the bag body based on the torque load of the electric motor when the movable body is pressed against the top surface of the bag body. a motor control unit that controls the pressing force;
a thickness calculation unit that calculates the thickness of the bag based on the amount of rotation of the electric motor;
The device for measuring the thickness of a multi-pack bag according to claim 1, comprising the following. The light detection unit is configured with a transmission type photoelectric sensor including a light emitting unit that irradiates the detection light and a light receiving unit that detects the detection light that has passed through the multi-pack bag.
The device for measuring the thickness of continuous packaging bags according to claim 1 or 2. The continuous packaging bag is made of an opaque packaging film.
4. The device for measuring the thickness of continuous packaging bags according to claim 3. the product is a snack food;
The device for measuring the thickness of continuous packaging bags according to any one of claims 1 to 4.

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