JPH0563375B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION Object of the Invention (Field of Industrial Application) The present invention relates to a method and apparatus for detecting the quality of a seal in a relatively flexible sealed package such as a powder bag. .

Synthetic resin, metal foil, and a film laminated with these are made into a rectangle, folded in half, sealed on two sides, and sealed on the remaining side after filling with contents, or using the above-mentioned film. Sealed packaging products, in which a tray is formed, the contents are filled, and the upper part is sealed with various films, are easy to package and can be processed in large quantities at low cost, so they are widely used in packaging various foods, medicines, etc. There is.

However, on the other hand, these types of sealed packages are prone to incomplete sealing due to pinholes in the seal area, contents getting caught in the seal surface, etc.
A considerable number of seal failures occurred due to excessive heating near the inner edge of the seal.

The above-mentioned poor sealing of a packaged product causes the contents to leak out due to spoilage or slight impact, and has become a major problem when the packaged product is put on the market.

The present invention provides a method and a device that can accurately and efficiently detect packaged products that have leaked contents due to seal failure and are in an unsuitable state for sale on the market, as described above. shall be.

(Prior art) Until now, no detection device with satisfactory accuracy has been developed for detecting the sealing condition of this type of packaged product, and it is necessary to manually hold the packaged product left for a certain period of time after sealing. At present, methods are being implemented, such as visual detection or visual detection. These manual methods have major problems in terms of detection accuracy and labor saving, such as the detection criteria differing depending on individual differences among workers.

(Problems to be Solved by the Invention) The present invention aims to solve the problems of the conventional methods as described above. It is an object of the present invention to provide a method and device that can be detected simply and in a relatively short time. Moreover, the present invention
Especially when producing hermetically sealed products at an industrial level,
Another object of the present invention is to provide a seal quality detection method and detection device suitable for use in production processes.

Structure of the Invention (Means for Solving the Problem) In order to achieve the above-mentioned object, the present inventors have conducted various studies on methods and devices for detecting the quality of the seal in this type of sealed package. As a result, we came to the following findings.

That is, the present inventors have discovered that various methods can be used for packaging products that are made of a flexible material and are filled with a fluid substance such as liquid, paste, or gas and sealed. Focusing on the phenomenon that when an external force is applied, the physical factors such as internal pressure and shape of a packaged product exhibit a specific displacement in response to that external force, we investigated the correlation between this physical displacement and the seal condition of the packaged product. . As a result, the displacement of the internal pressure of the packaged product in response to external force is different from that for a well-sealed product.
It was found that there was a clear difference between a case where the seal was defective and the contents leaked, and therefore the degree of the above internal pressure displacement was measured, and the measured values in this case were compared and analyzed. Depending on the quality of the sealing condition of the packaged product (inappropriateness as a product)
We have discovered that it is possible to detect this with great accuracy and with a relatively simple method. At the same time, displacement of the internal pressure of a packaged product occurs instantaneously or in a relatively short period of time when an external force is applied, so by measuring this displacement, the quality of the sealing condition of the packaged product can be determined instantly or relatively quickly. We found that it can be detected in time.

The present invention has been made based on the above findings, and the gist thereof is to apply an external force to a sealed package made of a flexible material containing fluid contents, and to reduce the internal pressure of the package due to this, or A method for detecting the sealing condition of a sealed packaged product, characterized in that the quality of the sealing condition of the packaged product is detected by detecting internal pressure and thickness displacement.

The present invention will be described in detail below.

First, the hermetically sealed package as used in the present invention is made of synthetic resin, metal foil, films such as laminated packaging materials, and various flexible materials, and contains liquid, paste, gas, powder, and solid materials inside. Filled with fluid contents, such as those containing substances,
It means a packaged product that is sealed by thermal adhesion or the like.

In the present invention, the quality of the sealing condition of the packaged product is detected by applying a constant external force to the above-mentioned sealed package and detecting the internal pressure of the packaged product due to this, or the displacement of the internal pressure and thickness. do.

The external force here refers to a force that is applied from outside the packaged product and changes the internal pressure or shape of the packaged product, such as a force that presses, pulls, or vibrates the packaged product. . When an external force as described above is applied to a packaged product, the package deforms against the change brought about by the external force, and a specific repulsive force is generated in the packaged product.

In the present invention, the state of deformation of the packaged product and the specific repulsive force as described above are captured as physical displacement of the packaged product, and by detecting this, the quality of the sealing state of the packaged product is detected.

In other words, when a certain external force is applied to a packaged product, a certain displacement occurs in physical factors such as internal pressure and shape of the packaged product, but in this case, if the packaged product is well sealed, The degree of displacement of the internal pressure described above is clearly different when the seal is defective. This is because if the sealing condition is good, there is no leakage of the contents, and the volume of the contents within the package remains unchanged, and as a result, the displacement of the internal pressure against external force remains almost constant. On the other hand, if the sealing condition is poor, the displacement of the internal pressure due to leakage will be different from that in the case where the sealing is good, and will fluctuate.

Therefore, by detecting the degree of displacement of the internal pressure of the sealed package due to external force, and comparing and analyzing the measured values in each case, it is possible to extremely accurately detect whether the seal condition of the package is good or bad. I can do it. Further, according to the detection method of the present invention, the degree of displacement of the internal pressure of the packaged product in response to a certain external force is quantified,
By comparing and analyzing this, we can reliably detect a seal failure even when the amount of leakage is small, almost eliminate detection malfunctions, and reduce the time required for detection. It can also have the remarkable effect of being short-lived.

Hereinafter, the present invention will be described in more detail based on the drawings.

FIG. 1 shows a case in which the quality of the sealing condition of a packaged product is detected by detecting the repulsive force and thickness displacement of the packaged product when the packaged product is pressed.

According to the figure, package 1 has a good seal, and package 1' has a poor seal. The above packages 1 and 1' have the same shape and size, are filled with the same contents in the same amount, are sealed under the same conditions, and are placed on the floor stand 20.
Furthermore, the plunger 3 can press the entire upper part of the packaged products 1 and 1'.

Here, when a predetermined pressure 2 is applied from above by the plunger 3 to the well-sealed package 1, the plunger 3 receives the pressure 2 due to the pressure of the contents 4 inside the package 1. A certain repulsive force 5 acts against it. In this case, the package 1 is well sealed and there is no pressure drop in the contents 4 due to leakage, so the repulsive force 5 is relatively strong. At the same time, the packaged product 1 is pushed by the plunger 3 in response to the above-mentioned pressure 2, deforms into a specific shape, and has a constant thickness 6.

On the other hand, when the same pressing force 2 as in the above case is applied from above by the plunger 3 to the packaged product 1' which has a poor sealing condition, a repulsive force 5' acts on the plunger 3 and the packaged product 1' is deformed to have a thickness of 6'. However, in this case, because there is a pressure drop in the contents 4 due to leakage due to a seal failure, the repulsive force 5' is weaker than the repulsive force 5 in the above case, even though the pressing force 2 is equal. Therefore, the thickness 6' is the thickness 6
becomes smaller than Moreover, in this case, even if the leakage from the package 1' is small, there is a clear difference between the repulsion forces 5 and 5' and the thicknesses 6 and 6'.

Therefore, when detecting the quality of the sealing condition of a packaged product, first, the repulsion force 5 is calculated when a certain pressure 2 is applied by the plunger 3 to each of the packaged products 1 with good seals. and thickness 6. Furthermore, for a plurality of packages 2 with defective seals, the repulsive force 5' and thickness 6' of each case are measured in the same manner. Here, the repulsive force 5,
5' and thicknesses 6 and 6' are measured, for example, by using a pressure sensor 7 or a distance sensor (not shown) installed on the plunger 3.

Next, from the measured values obtained as above,
Find target values for each of the repulsion force and thickness that can clearly determine whether the sealing condition of the packaged product is good or bad.

From now on, in order to detect whether the sealing condition of the packaged product is good or bad, the packaged product is pressed by the plunger 3 under exactly the same conditions as in the above case, and the repulsive force and thickness of the packaged product in that case are measured. This is done by measuring, comparing each measured value with the target value mentioned above, and analyzing it. The comparison and analysis of the above-mentioned measured values can also be performed, for example, using an adjustment device, etc., which will be described later.

In the above case, it is also possible to perform detection by measuring and comparing only either the repulsive force or the thickness of the packaged product due to pressure. However, when detection is performed based on both the repulsive force and thickness of the packaged product due to pressure, more accurate detection can be achieved by measuring and comparing both measured values together.

Further, according to the above method, the packaged product is placed on the floor stand 20.
The quality of the seal can be detected by simply placing it horizontally on the top and pressing it with the plunger 3. Also, there is no need to apply a particularly large external force during detection, making detection easy and preventing the contents from entering. It has a great effect in preventing damage.

Next, Fig. 2 shows how to detect the quality of the sealing condition of a packaged product by detecting the repulsive force and physical displacement of the shape of the packaged product when the packaged product is partially pressed. Indicate the case.

According to the figure, the packages 1 and 1' are the same as those in FIG. 1 above and are each placed on a floor stand 20. Further, the plunger 9 can partially press the upper portions of the packages 1 and 1'.

Here, when a predetermined pressure 10 is applied from above by the plunger 9 to the upper center of the well-sealed packaged product 1, the contents 4 in the packaged product 1 are It moves to the part 11 at the top of the item 1 that cannot be held down by the plunger 9. As the contents 4 move as described above, a certain repulsive force 12 is applied to the portion 11 of the packaged product 1 that cannot be pressed by the plunger 9 against the pressure 10.
acts, and at the same time the packaged product 1 is deformed, creating a certain height difference 14 between the portion 13 pressed by the plunger 9 and the portion 11 not pressed. In the packaged product 1, the sealing condition is good, there is no leakage, and the volume of the contents does not change, so the repulsive force 12 resisting the pressing force 10 and the height difference 14 are approximately constant values.

On the other hand, when a package 1' with a poor seal is pressed in the same way as in the case described above, a repulsive force 12' acts in this case as well, resulting in a height difference 14'. However, in this case, there is a pressure drop in the contents 4 due to leakage due to a poor seal, and the repulsive force 12' is weaker than the repulsive force 12 when the seal is good, and the height difference is 1.
4' is smaller than the height difference 14.

Therefore, when detecting the quality of the seal in a packaged product, as in the case of FIG. The repulsive forces 12, 12' and the height differences 14, 14' are measured when a constant pressure 10 is applied by the plunger 9 to each of the specimens. When measuring the repulsive force 12, 12' and the height difference 14, 14', for example, a pressure sensor 15 that can come into contact with the part 11 that cannot be pressed by the plunger 9,
This can be done by using a distance sensor (not shown) and a distance sensor (not shown) installed on the plunger 9, etc.

From the measured values obtained as described above, target values for each of the repulsion force and height difference are determined, which can clearly determine whether the sealing condition of the packaged product is good or bad.

Thereafter, to detect the sealed state of a packaged product, the packaged product is pressed by the plunger 9 under exactly the same conditions as in the above case, and the repulsion force and height difference of the packaged product are measured in that case. This is carried out by comparing and analyzing the measured value with the above-mentioned target value, and if necessary, the above-mentioned operation can also be carried out, for example, by means of an adjustment device, which will be described later.

According to this method, the pressure on the packaged product is localized, so significant physical changes (repulsive force, height difference, ) occurs. Therefore, by detecting this physical displacement, the sealed state of the packaged product can be detected more accurately and easily, and furthermore, a clear physical change appears in a short time when the plunger 9 comes into contact with it. , by detecting this, detection can be performed in a short time. In addition, the above physical displacement clearly appears even when the pressure is small, so it is recommended to perform detection with a small pressure to minimize damage to the packaged product and contents and to perform detection efficiently. can.

Next, Figure 3 shows a case where the quality of the sealing condition of a packaged product is detected by applying vibration to the packaged product and measuring the resonant frequency, vibration level, etc. of the packaged product. show.

According to the figure, the packages 1 and 1' are the same as those in FIG. 1 above and are each placed on a floor stand 20. The vibrating plate 16 comes into contact with the packaged products 1 and 1' and can apply constant vibration to them.

Here, the vibrating plate 16 is brought into contact with the top of each of the well-sealed packaged product 1 and the poorly sealed packaged product 1', thereby causing the packaged products 1 and 1'
When a constant periodic force is applied to the packages 1 and 1', the packages 1 and 1' vibrate. In the above case, the pressure and amount of the contents differ between the packages 1 and 1' depending on whether there is leakage, and the way vibrations are transmitted differs, so the resonant frequency and vibration level also differ.

Therefore, when detecting the quality of the seal in a packaged product, for a plurality of packaged products 1 with a good seal and packaged product 1' with a bad seal,
The resonance frequency and vibration level are measured when a constant vibration is applied by each vibrating plate 16. The above measurement can be performed using, for example, a vibration sensor 18 installed on the vibration plate 16.

From the measured values obtained as described above, target values for each of the resonance frequency and vibration level are determined, which can clearly determine whether the sealing condition of the packaged product is good or bad.

Thereafter, to detect the seal condition of a packaged product, a vibrating plate is brought into contact with the packaged product under exactly the same conditions as in the above case, and vibration is applied to the packaged product, and the resonant frequency and vibration level of the packaged product in that case are detected. measure,
This is carried out by comparing and analyzing each measured value with the above-mentioned target value, and if necessary, the above-mentioned operation can also be carried out, for example, by means of an adjustment device, which will be described later.

Next, FIG. 4 shows a case where the quality of the sealing condition of the packaged product is detected by detecting the displacement of the shape and size of the packaged product when the packaged product is pressed.

According to the figure, the packages 1 and 1' are the same as those in FIG. 1 above and are each placed on a floor stand 20. The pressing device 19 includes a plurality of pressing portions 22 that can partially press the upper portions of the above-mentioned packages 1 and 1' over substantially the entire surface thereof. A distance sensor 21 is installed in each of the pressing parts 22 to measure the distance between this part and the floor stand 20.

Here, the pressing part 22 of the pressing device 4 is brought into contact with the top of each of the well-sealed packaged product 1 and the poorly sealed packaged product 1', and when pressure is applied, the packaged products 1 and 1' is deformed and the pressing device 19
The respective pressing portions 22 and the floor stand 20 have intervals a to e and a' to e'.

In the above case, the distances a to e and a' to
e' differs depending on whether or not the contents leak, and a specific calculation formula is used based on each of the distances a to e and a' to e' between each of the pressing parts 22 and the floor table 20. The cross-sectional area values S and S' or the volume values (not shown) for the packages 1 and 1' determined by the equation are also clearly different.

Therefore, when detecting the quality of the seal state of a packaged product, for a plurality of packaged products 1 with good sealing state and packaged product 1' with poor sealing state,
Press with the pressing part 22 of the pressing device 19 under exactly the same conditions as in the above case, measure the distances a to e and a' to e' between the pressing part 22 and the floor stand 20 in each case, and if necessary, , calculate the cross-sectional area value and volume value for each packaged item from them. The cross-sectional area value as above,
When determining the volume value, it can also be performed using mechanical calculation means or electrical calculation means (both not shown) that work in conjunction with the distance sensor 21 installed on the pressing part 22 of the pressing device 19.

Next, from the measured values obtained as above,
Target values are set for the distance between each of the pressing parts 22 of the pressing device 19 and the floor stand 20, as well as the cross-sectional area value and volume value determined from these, so that the quality of the sealing state of the packaged product can be clearly determined. demand.

Thereafter, in order to detect whether the sealing condition of the packaged product is good or bad, the packaged product is pressed with the pressing part 22 of the pressing device 19 under exactly the same conditions as in the above case, and the pressing device This is done by determining the distance between each of the pressing parts 22 and the floor stand 20, and if necessary, the cross-sectional area value and volume value from these, and comparing and analyzing each value with the target value above. .

According to the above method, it is possible to detect the sealing state of the packaged product while it has an uneven shape, there is no need to apply strong pressure to the packaged product, and even when the contents contain solids, etc. These are rarely destroyed by pressure during detection.

Next, the detection method of the present invention will be explained based on the case where the following detection device is used.

FIG. 5 shows an example of a detection device used in the present invention. This detection device includes a pressure plate 23 for pressing the packaged product 30, a diaphragm 24 for detecting the repulsive force 28 of the packaged product 30 against the pressure, a displacement transmission lever 25, a pressure sensor 26, and a display meter 27. Nari, packaged product 3
It is provided so that it can be moved up and down so that it comes into contact with zero or moves away from it.

When using this device to detect the quality of the seal in the packaged product 30, first
0 to a transfer device 34 such as a belt conveyor, etc.
, the device is supplied to a detection position where it can abut the packaged product 30 . In this case, the packaged product 30 is placed on the transfer device 34 in a horizontal state with one of the side plates facing down, and is sent to the detection position.

When the packaged product 30 is supplied to the detection position, the pressure plate 23 descends and comes into contact with a portion surrounding the approximate center of the upper side plate of the packaged product 30, and presses this portion from above. The packaged product 30 is deformed by the pressure, and the approximately central portion of the upper side plate whose periphery is pressed by the pressure plate 23 swells, and a repulsive force 28 acts on this portion. Here, the pressure plate 23 is usually made of a hard material such as metal or plastic. Further, the diaphragm 24 is made of a flexible material such as flexible plastic or rubber, and the diaphragm 24 is made of flexible material such as flexible plastic or rubber.
The detection device is stretched so as to come into contact with approximately the center of the upper side plate of the packaged product 30 when the detection device is lowered. Therefore, as described above, the approximately central portion of the upper side plate of the packaged product 30 is raised, and a repulsive force 28 is applied to this portion.
When this occurs, the diaphragm 24 that comes into contact with this portion is pushed up accordingly. The pressure pushing up the diaphragm 24 (the repulsive force 28 of the packaged product 30) is transmitted to the pressure sensor 26 via a displacement transmission lever 25 provided between the diaphragm 24 and the pressure sensor 26 described below, and is detected there. Ru. The detection value detected by the pressure sensor 26 is transmitted as a signal to the display meter 27 via a suitable transmission device (not shown), if necessary, and is thereby displayed. As the pressure sensor 26,
It has the function of detecting pressure and transmitting it as a signal.
For example, a differential transformer, a load cell, etc. can be used.

In the above case, if the sealing condition of the packaged product 30 is good, the repulsive force 28 becomes a relatively large value and is displayed on the display meter 27, while if the sealing condition is poor, the repulsive force 28 indicates that the sealing condition is good. In this case, the variable value is displayed on the display meter 27. Therefore, when actually detecting the quality of the sealing condition of the packaged product 30, the value with a display meter that can determine the quality of the sealing condition is determined experimentally in advance, and then the value of each packaged product is measured. This is done by comparing the detected value at 30 with this value. In addition, when sorting the packages 30 into those with good seals and those with bad seals based on the value displayed on the display meter 27, it can be done manually, for example, or by using this device and a transmission device as described later. , adjustment device and exclusion device (all not shown)
It is also possible to perform this by connecting the above and operating them as a series of control systems.

In addition, after this detection device detects whether the sealing condition of a certain packaged product 30 is good or bad as described above, it ascends and leaves this packaged product 30, and then another packaged product 30 is moved to the detection position. Once it is fed, it comes into contact with it again to detect the sealing state.

According to this detection device, the repulsive force 28 caused by the pressing of the packaged product 30 is clearly digitized and displayed on the display meter 27. Therefore, each packaged item 3
By determining whether the detected value for 0 corresponds to a good sealing condition or a bad sealing condition,
The quality of the seal can be detected extremely accurately and easily.

Next, FIG. 8 shows a detection device using a roller in place of the plunger 23 and diaphragm 28 in the above-described detection device.

In this device, the pressing rollers 43 and 44 are provided so as to be rotatable along the transport direction of the packaged product 30 in a state where they can move upward when a certain pressure is applied from below. At the same time, the pressing rollers 43 and 44 are installed so that their lower peripheral edges are slightly lower than the upper end of the upper side plate of the packaged product 30. The detection roller 45 is provided so that its lower peripheral edge contacts the upper side plate of the packaged product 30 during detection.
The detection roller 45 is also equipped with a pressure sensor 38 that can come into contact with the packaged product 30 and detect the repulsive force 38 thereof.

When using this device to detect the sealing state of the packaged product 30, the packaged product 30 sent by the transfer device 30 first contacts the pressing roller 43, then the detection roller 45, and is further sent. The packaged product 30 also comes into contact with the pressing roller 44, and the packaged product 30 comes into contact with all the rollers. In this state,
The front and rear portions of the upper side plate of the packaged product 30 in the transport direction are pressed by pressing rollers 43 and 44 with a constant pressure. In this case, the approximately central portion of the packaged product 30 swells due to the pressure, and a repulsive force 28 acts on the lever portion. This repulsive force 28 (for example, the repulsive force when the center part of the upper side plate of the packaged product 30 comes into contact with the pressure sensor 38) is
Pressure sensor 3 provided on detection roller 45
8 and displayed on the display meter 27.
The quality of the sealing condition of the packaged product 30 is determined based on the display of this display meter, for example, according to the fifth
It is detected in the same way as in the figure.

Next, the detection method of the present invention will be explained based on the case where another detection device is used.

FIG. 6 shows another example of the detection device used in the present invention. This detection device substantially detects the packaged product 30
A detection member 29 (however, in this case, the detection member 29 also has the function of applying an external force to the packaged product 30), a transmission device 31, and an adjustment device 32 are used to detect whether the seal condition is good or bad. a removal device 33 for removing a packaged product 30,
and a transfer device 34 for sending the packaged product 30 to the detection member 29 described above.

When using this device to detect the quality of the seal in the packaged product 30, first
0 is supplied to the detection position of the detection member 29 at a constant speed by a transfer device 34 such as a belt conveyor. In this case, the packaged product 30 is placed on the transfer device 34 in a horizontal state with one side plate facing down,
sent to the detection position.

The detection member 29 includes an air chamber 35, a pressure plate 36, a diaphragm 37, and a pressure sensor 38, as shown in FIG.
It is installed so that it can be raised and lowered freely. Here, the air chamber 35 becomes the main body of the detection member 29. The pressure plate 36 is connected to the air chamber 3 described above.
5 and comes into contact with the upper side plate of the packaged product 30 to partially press it. Also, diaphragm 3
7 is made of a flexible and highly airtight material such as plastic or rubber, and is stretched over the pressure plates 36 so as to cover the spaces between them. Therefore, in this detection member 29, the air chamber 35, pressure plate 36, and diaphragm 37 form a sealed portion 39 having a certain space. Pressure sensor 38
is provided in the air chamber 35 and has a function of detecting the pressure of the sealed portion 39 and transmitting the detected pressure as a signal. For example, a micro-pressure switch, a piezoelectric element, etc. can be used.

The detection member 29 having the above structure is configured to detect the packaged product 3.
For example, it is provided to move up and down at constant time intervals in accordance with the transfer speed of the transfer device so as to ensure contact with the transfer device. Further, as shown in FIG. 7, one or more of the above-mentioned detection members 29 are embedded in the periphery of a roller 40 fixed to a rotating shaft 41 perpendicular to the transport direction of the packaged product 30, and this roller 40 is transported. By rotating the detection member 29 in accordance with the transfer direction and transfer speed of the device 34, the detection member 29 detects the packaged product 30.
It can also come into contact with.

When the packaged product 30 is supplied to the detection position of the detection member 29, the detection member 29 descends, and the pressure plate 36 provided thereon comes into contact with the upper side plate of the packaged product 30, partially separating the packaged product 30. to press the target. In this case, the packaged product 30 is pressed and deformed by the pressure plate 36, and a repulsive force 42 acts on the approximately central portion of the upper side plate that is not pressed, and this portion bulges to form the flexible diaphragm 3.
Push up 7. When the diaphragm 37 is pushed up as described above, the volume of the sealed portion 39 formed by the diaphragm 37, the air chamber 35, and the pressure plate 36 is reduced, and the pressure in this portion is increased. In this case, if the packaged product 30 is in a good sealed state, the pressure increase in the sealed portion 39 will be large. On the other hand, if the package 30 is poorly sealed, the pressure increase in the sealed portion 39 will be smaller and more variable due to leakage of the contents than if the package 30 were well sealed.

The degree of pressure increase in the sealed portion 39 as described above is detected by a pressure sensor 38 provided in the air chamber 35, and the detected value is transmitted as a signal from there to a transmission device 31 to be described later.
In this case, since the degree of pressure increase in the sealed portion 39 differs depending on the quality of the sealing condition of the packaged product 30 as described above, the signal sent from the pressure sensor 38 depends on the sealing condition of the packaged product 30. It will obviously differ depending on whether it is good or bad.

The signal sent from the pressure sensor 38 of the detection member 29 to the transmission device 31 is converted into another signal suitable for transmission, which is easy to analyze and compare in the adjustment device 31 described here below. As the transmission device 31, a converter using a semiconductor is usually used.

Next, the signal converted by the transmission device 31 is analyzed and compared in the adjustment device 32, and an operation signal is sent from there to the exclusion device 33 described below.

In this case, the adjustment device 32 includes the transmission device 31
A target value that can clearly determine whether the signal transmitted from the package 30 is in a good sealing state or in a bad seal state is stored, and the target value is transmitted from the transmission device 31. The received signal is compared with this target value to determine whether the sealing condition of the packaged product 30 is good or bad, and an operation signal is sent to the removal device 33 only if the sealing is defective. Adjustment device 32
Generally, an electronic regulator or the like is used.

Finally, the removal device 33 is activated by the above-mentioned operation signal, and removes the packaged product 33 with a poor sealing condition.
are removed from the production line. In this case, an appropriate control system must be established between the detection member 29 and the removal device 33 so that the packaged product 30 detected as defective is reliably removed from the line. Note that as the removal device 33, for example, an air rejector, a mechanically operated lever, or the like can be used.

According to this device, the repulsive force 41 caused by pressing the packaged product 30 is converted into an electrical signal, and
The quality of the 0 seal state is determined by electrically comparing and analyzing this signal. As a result, even if the content leaks from the packaged product 30 in an extremely small amount, the slight difference in the electrical signals in that case can be detected and reliably detected as a seal failure.
Furthermore, the packaged product 30 detected as having a defective seal as described above is transferred to the detection member 29 and the discharge device 3.
It is automatically removed from the production line by the control system set up between 3 and 3. Therefore, the effects of using this device in the production process for industrially producing this type of packaged product are extremely large.

The above is merely a description of embodiments of the present invention, and it goes without saying that various modifications and applications can be easily made without departing from the gist of the present invention.

(Effects of the Invention) As described above, according to the detection method and device of the present invention, it is possible to determine whether the sealing condition of a sealed package is good or not.
It can be detected accurately, easily, and in a relatively short time. Therefore, this detection method and device are extremely effective, especially when used in the production process of producing sealed packaged products at an industrial level.

[Brief explanation of the drawing]

1 to 4 are for explaining the case where the detection method of the present invention is implemented, and FIGS. 5 to 8 show examples of the detection apparatus of the present invention. 1, 1', 30...Packaged product, 2,10...Press,
3, 9...Plunger, 4...Contents, 5,
5', 12, 12', 28, 42... Repulsive force, 6,
6'... Thickness, 7, 15, 26, 38... Pressure sensor, 14, 14'... Height difference, 16... Vibration plate, 19... Pressing means, 20... Floor stand, 2
1... Distance sensor, 22... Pressing part, 23...
Pressure plate, 24...Diaphragm,
25... Displacement transmission lever, 27... Display meter, 29... Detection member, 31... Transmission device, 32
...adjustment device, 33...exclusion device, 34...transfer device, 35...air chamber, 36...pressure plate, 39...sealing portion, 40...
Roller, 41...Rotating shaft, 43, 44...Press roller, 45...Detection roller.

Claims (1)

[Claims] 1. By applying an external force to a sealed package made of a flexible material containing fluid contents and detecting the internal pressure of the package, or the displacement of the internal pressure and thickness due to this. A method for detecting a sealing condition of a sealed packaged product, the method comprising detecting whether the sealing condition of the packaged product is good or bad. 2. The method of claim 1, wherein an external force is applied partially to the package. 3 (a) A device for applying external force to a sealed package made of flexible material containing fluid contents; (b) Detecting the internal pressure of the package due to external force, or the displacement of internal pressure and thickness; a detection member for extracting the necessary signal; (c) a transmission device for converting the signal obtained by the detection member into another signal suitable for transmission;
(d) A regulating device for comparing the signal from the transmission device with a target value and issuing an operating signal; (e) A device for receiving the operating signal from the regulating device and rejecting some of the packaged items. , (f) A device for detecting the sealing state of a sealed package, comprising: a device for transferring the package to the detection member.