JPS6238227B2 - - Google Patents

Description

Detailed Description of the Invention () BACKGROUND OF THE INVENTION Technical Field The present invention relates to a method and method for inspecting containers for containing conductive contents, such as liquids such as Ringer's solution and infusion preparations, or amorphous contents such as foods. This relates to inspection equipment.

Prior Art When attempting to inspect almost the entire surface of a container by sandwiching it between two electrodes, air moves above the container and becomes an obstacle to the inspection. In order to solve this problem, Japanese Patent Application Laid-Open No. 53-32084 discloses an invention in which a glass ampoule to be inspected is rotated and air is moved to thoroughly inspect the glass ampoule. However, since it relies on two screw rolls rotating in the same direction for air movement, it is suitable for fixed hard containers such as ampoules and bottles. However, in the case of containers made of soft resin that contain easily deformed objects or irregularly shaped liquids and fluids, such as Ringer's solution and infusions, transportation becomes difficult. Furthermore, due to the characteristics of the liquid and fluid stored inside, the container becomes flat,
It is virtually impossible to reverse it. Therefore, defect inspection of flat, amorphous containers containing amorphous contents such as liquids and fluids has been extremely inadequate.

() Object of the Invention The present invention has been proposed in view of the disadvantages of the prior art, and its main purpose is to propose a method and apparatus for inspecting irregularly shaped containers for containing fluid.

Further, the present invention proposes a method and apparatus for inspecting defects in irregularly shaped containers containing fluid that is flattened. SUMMARY OF THE INVENTION An object of the present invention is to provide a method for inspecting a container made of a dielectric material for containing a gas and an amorphous conductive content, the method of inspecting the container for defects by tilting the container. a first content transfer step of moving upwardly to create a portion of the container filled with conductive content;
A first step of forming a closed circuit between test electrodes in a region filled with the conductive content, and testing characteristics of the electrical closed circuit formed between the container and the conductive content.
a second contents moving step of reversing the inclination of the container to move the gas in the opposite direction to create an uninspected portion of the container filled with conductive contents; and a second inspection step of inspecting the electrical closed circuit characteristics formed between the container and the conductive contents at the site newly filled with the conductive contents by the second contents transfer step. This is achieved by a container defect inspection method characterized by the following.

In this inspection, the content movement process is performed by setting the inclination of the conveyance path for conveying the container to a predetermined value. Preferably, after the first inspection process is performed, the inclination of the conveyance path is reversed to move the gas in the opposite direction, and the second inspection process is performed.

Still further, the container is comprised of a flexible dielectric material that deforms into a generally flattened state when placed under the weight of its contents. A further object of the present invention is to provide a container defect inspection device for inspecting defects in a container made of a dielectric material containing gas and amorphous conductive contents, the device comprising a container transport path and , by reversing the inclination of the container on the conveyance path,
a content moving means for moving a portion of the container filled with the conductive content according to the inclination of the container; and two sides of the container filled with the conductive content;
A closed circuit is formed between an inspection electrode that comes into sliding contact with the surface of the container and the inspection electrode in a region filled with the conductive content, and an electrical connection is formed between the container and the conductive content. This is achieved by a container defect inspection device characterized by having means for inspecting circuit characteristics. In this device, the conveyance path is pivoted so as to be rotatable at least by a predetermined angle, and is inclined alternately in two directions about the pivot point.

Preferably in the device the conveying means is configured to have a selective inclination in two directions.

() Specific description of the invention Examples of the present invention will be described in detail below.

In FIG. 1 showing the conceptual structure of an embodiment of the present invention, reference numeral 1 denotes an electroconductive infusion bag made of a dielectric material such as polypropylene and containing, for example, Ringer's solution 2. In FIG. Reference numeral 3 denotes a conveying roller section, of which a plurality of conveying rollers are driven by a drive source (not shown) to convey the infusion bag 1 in the direction of the arrow in the figure, except for the insulated rollers 3b and 3c. It is a conductive roller. 5 and 6 are infusion bag 1
Approximately 3 to 5 mm across the entire width of the top and bottom surfaces
A plurality of pin electrodes are in sliding contact with each other at intervals of .
7 is an air cylinder which urges the arm 8 clockwise or counterclockwise around the fulcrum 9;
The conveyance roller section 3 is held at two stable positions, upward to the left or upward to the right. As a result, air 1 in the infusion bag 1
0 moves to the top or bottom of the infusion bag as shown.

In the above configuration, the capacitance of the capacitor formed is small because the pin electrodes 5 and 6 facing each other from the upper and lower surfaces of the infusion bag 1 are in contact with the dielectric infusion bag 1 over a small area. On the other hand, the contact area of the conductive rollers 3a and 3d with the infusion bag 1 is large, and the capacitance of the formed capacitor becomes large. Due to this difference in capacitance, when the conductive rollers 3a and 3d are used as ground electrodes and a high frequency current is applied between the electrodes 5 and 6 and the ground electrode, the impedance formed by the ground electrodes becomes negligible. This electrical configuration is shown in FIG. 3 and will be described in detail. In Figure 3,
R1 is the distributed resistance of the liquid between the Ringer's solution 2 via the infusion bag 1 of the electrode 6 and the ground electrode 3d.
R2 is the distributed resistance of the liquid between the Ringer's solution 2 and the ground electrode via the infusion bag 1 of the electrode 6. Similarly, R4 is the distributed resistance between the earth electrode 3d and the electrode 5, and R4 is the distributed resistance between the earth electrode 3a and the electrode 5.

The configuration shown in FIG. 2 is electrically shown in the circuit diagram in FIG. 3, and further shown in the equivalent circuit in FIG. 4. In FIG. 3, a capacitor _C1 is formed by a conductive roller 3a serving as a ground electrode, an infusion bag 1 serving as a dielectric, and a conductive Ringer's solution 2 inside. The capacitor _C2 is formed by a conductive roller 3d serving as a ground electrode, an infusion bag 1, and Ringer's solution 2. On the other hand, a small capacitor
_C3 is formed by the electrode 5, the infusion bag 1 which is a dielectric, and the liquid inside. Capacitor C ₃
A capacitor C ₄ connected in parallel with is formed by the electrode 6, the bag 1 and the liquid inside. In this configuration, the values of capacitors C ₃ and C ₄ are very small, so the impedance is high, while the values of capacitors C ₁ and C ₂ are very large, so the equivalent circuit is as shown in Figure 5. .

Now, if there are no defects such as pinholes or cracks on the inspection surface of infusion bag 1, which is the inspection control,
Since the capacitance of capacitors C ₃ and C ₄ is very small,
High impedance, high voltage high frequency power supply, resistance
Only a dark current flows through the closed circuit formed by R ₁ to R ₄ and capacitors C ₃ and C ₄ . On the contrary,
If there is a defect such as a pinhole, flash shorting etc. will occur in the defective part of the film, and the impedance of capacitor C ₃ or C ₄ will decrease drastically, and the impedance will become almost resistance.
Only R ₁ R ₂ and R ₃ R ₄ are available. As described above, the resistances R ₁ R ₂ and R ₃ R ₄ are the resistance of a conductive liquid such as Ringer's solution 2, and therefore have a low resistance value. Therefore,
When a leak occurs in capacitor _C3 or _C4 , high frequency current increases. If this phenomenon is detected by the detector 20, it becomes possible to detect defects on two sides of the infusion bag.

Next, air 10 is sealed in the infusion bag 1 together with Ringer's solution. Air 10 is connected to electrode 5 during inspection.
If a leak were to occur in capacitors C ₃ and C ₄ , the current passing through the capacitors would be blocked by the high impedance of the thick air layer. That is, a closed circuit to be formed by a power source, a resistor, and a capacitor is interrupted by the air layer. Therefore, defects such as pinholes on the air layer cannot be detected, leading to erroneous inspections. Such disadvantages are overcome by the embodiments shown in FIGS. 1 and 2. The left-up state of the transport roller section 3 shown in FIG. 1 is called a first state, and the state of the transport roller section 3 shown in FIG. 2 is called a second state. In the first state, the infusion bag 1 is upward to the left due to its slope, so
The air 10 moves to the upper end of the lower part of the bag, and except for the lower part of the infusion bag 1, the middle part of the bag 1 and the right half of the mouth part are filled with conductive liquid, forming the equivalent circuit shown in FIG. In this state, inspect the right half of the infusion bag. Therefore, if there is a defect such as a pinhole, it can be detected correctly. Next, when the inspection of the right half is completed and the detection means such as a photo interrupter or micro switch detects that the infusion bag has advanced to the position indicated by the arrow 11, the air cylinder 7
supplies pressurized air to drive the plunger. The conveying section 3 is driven counterclockwise around the fulcrum 9 by the plunger. As a result, the conveying section is in the second upward-sloping state, and the air 10 moves to the vicinity of the opening of the infusion bag 1, which has already been tested. Therefore,
There are no air bubbles in the lower left half of the infusion bag 1, and the conditions of the equivalent circuit shown in FIG. 5 are formed, and defects such as pinholes existing in this region can be detected correctly.

6 and 7 are diagrams for explaining the arrangement, shape, and operation of the pin electrodes 5, 6. As shown in FIG. 5, the electrodes 5 are arranged at intervals of 3 to 5 mm, and A spring 55 hooked between the pin 52 and the hook 54 of the electrode base 53 on the electrode base 51 is always biased clockwise with a predetermined spring force in FIG. Therefore, following the distance in the thickness direction of the test object passing under the electrode 5, the electrodes ₅₁ to ₅₇ move up and down and come into sliding contact on the surface of the test object. Here, the reason why the electrodes 5 ₁ to 5 ₇ are arranged at a predetermined distance apart from each other is that the liquid inside the infusion bag can be seen as a surface when viewed from the pin electrode, and the lines of electric force coming out from the pin electrode The reason lies in the fact that it has an expanse. Therefore, by arranging the pin electrodes at predetermined intervals, an electric field can be applied throughout the infusion bag, which is a dielectric material. The electrodes 5 and 6 are electrode guides 56 fixed to an inspection table (not shown) in FIGS. 6 and 7.
The distance is regulated to a predetermined interval. Electrode guide 5
As shown in the figure, the pin electrodes 6 are inserted between the pin electrodes 5 ₁ to 5 ₇ so as to sandwich the pin electrodes 5 1 to 5 7 .

In the above explanation, among the high voltage and high frequency applied to the detection circuit, the voltage refers to the voltage that does not cause discharge breakdown in a bag with a normal thickness, and the frequency refers to the voltage that is detected when capacitors C ₃ and C ₄ leak. This is the frequency at which sufficient current flows through the circuit. Specifically, the thickness of the sheet of the infusion bag is usually
The thickness is about 400μ, but for example, due to poor thickness, the thickness is 60μ.
In the case of μ, 34 out of 55 cases suffered dielectric breakdown at a voltage of 15 kV and were detected as defective.

Furthermore, in the above description, a mode has been described in which a defective test is performed while the electrode is in contact with the infusion bag. However, the present invention is not limited thereto, and the electrodes can be set apart from the bag surface. In this case, since air is further interposed as a dielectric, capacitors C ₅ and C ₆ shown by broken lines are formed. Therefore, the current can be detected by taking these capacitors C ₅ and C ₆ into consideration.

Based on the conceptual understanding of the present invention obtained from the above explanation, a more detailed explanation will be given based on an example in which the inspection device is used in an inspection process during the manufacturing process of an infusion bag. Note that common reference numbers are given to common configurations.

The infusion bag 1 is sent from the left side in FIG. 8 by a roller. This infusion bag 1 is received by an inspection table 62. Inspection table 6
2 is held in two positions, an upward left position and an upward right position, by an air cylinder shown in FIGS. 1 and 2 with the fulcrum 64 as the center. Reference numeral 66 indicates a state in which the rotary solenoid has been rotated to the upper left position, and reference numeral 68 indicates a state in which it has been rotated to an upper right position. 70-0 to 7
Reference numeral 0-6 is a rubber roll that drives a net ground which becomes a ground electrode for forming the capacitor _C1 . 74-1 and 74-2 are insulating rolls.
An electrode 6 fixed on the inspection table faces from between these two insulating rolls so as to come into sliding contact with the lower surface of the infusion bag 1. Electrode 5 faces from the opposite side so as to substantially oppose electrode 6. 76-0 to 7
6-7 is a rubber roll that drives the net ground 78 forming the capacitor _C2 . The net earths 72, 78 are rotated by a drive motor (not shown) provided via a pulley 80, clutch 32, and belts 84, 86 to transport the infusion bag. 88
is a photo coupler installed between ground electrodes 76-0 and 76-1 for detecting the transportation position of the infusion bag.

Next, the operation of the embodiment shown in FIG. 8 will be described in detail. First, the inspection apparatus of the embodiment is initialized, and the inspection table 62 is set in an upward left-hand state as indicated by reference numeral 66. Therefore, the conveying surface of the infusion bag 1 conveyed by the rollers 60 and the surface of the inspection table are substantially continuous, which is convenient for conveying fragile objects such as infusion bags that have liquid contents. The infusion bag 1 is conveyed by a net ground 72 driven by a rotating rubber roll, and a closed circuit is formed by the electrodes 5 and 6 that are in sliding contact over the entire surface of the upper and lower surfaces and the net ground 72 that forms a ground electrode. If there are pinholes, etc., a flashover will occur, and if the infusion bag does not have the normal thickness for some reason, the capacitors C ₃ and C shown in Figures 4 and 5 will be damaged due to discharge destruction. One or both of ₄ causes a leak. The current flowing at this time may be detected by the detector 20.

The completion of the inspection of both the upper and lower front half of the infusion bag means that the rubber roll 76-0,
It is detected by the photo interrupter 88 installed between 76-1, and air from the pressure source is supplied to the air cylinder shown in FIGS. 1 and 2, which drives the plunger and moves the inspection table 62 upward to the right. move it to the state of The state equivalent to this state is the second
It is a diagram. As can be understood from Fig. 2, the air inside the infusion bag 1 moves near the mouth of the bag, and from the middle to the bottom where the test will be performed,
The circuit conditions shown in FIG. 5 are satisfied. Therefore, if there are defects such as pinholes, cracks, or insufficient thickness on both the upper and lower surfaces of the infusion bag 1, it is possible to perform the inspection without being hindered by air. After the inspection has been completed, the infusion bag rides onto the conveyance path by rollers 90 and the like provided continuously on the inspection table, and is further conveyed toward the next work station. A defect signal detected by the inspection device is transmitted as the product is transported, and good products and defective products are separated, and non-defective products are packaged by a packaging machine.

Although the configuration shown in FIG. 8 shows a preferred configuration, electrodes 5 and 6 are placed near the center of rotation of the rotating examination table and slide on the infusion bag by means of a spring 55, as shown in FIGS. It is desirable that the tips of the two come together.

In the above explanation, an embodiment in which the inspection table has a bistable inclination has been shown, but in the present invention, an inclination that realizes the movement of the gas layer can be given to the object to be inspected at the inspection position. If so, various aspects can be adopted.

() Specific Effects of the Invention As described above, according to the present invention, the air layer is moved by alternately changing the inclination within the container that stores the amorphous conductive contents, thereby reducing the high impedance of the air layer. The quality of the container can be inspected without any interference. Further, according to a preferred embodiment of the present invention, although the container is flattened due to the characteristics of the amorphous contents, the air layer is moved by changing the inclination of the conveyance path, so the air layer is reliably moved.
Inspection accuracy improves. Therefore, with the present invention, defects such as pinholes, cracks, and insufficient thickness can be eliminated as much as possible.
It is possible to prevent the product from being sent off the production line, and it is possible to improve confidence in the product.

[Brief explanation of the drawing]

1 and 2 are diagrams conceptually showing one embodiment of the present invention, FIGS. 3 and 4 are electrical equivalent circuit diagrams of the configuration shown in FIGS. 1 and 2, and FIG. is the electrical equivalent circuit diagram of Fig. 1 and Fig. 2, which is shown by removing capacitors C ₁ and C ₂ from Fig. 4 considering the characteristics, and Fig. 6
The figure shows the configuration of the pin electrode, a plan view showing the electrode part taken out, Figure 7 is a side view of Figure 6, and Figure 8 shows the embodiment of the present invention installed in a product manufacturing line. It is a side view showing an inspection device. Here, 1... Infusion bag, 2... Ringer's solution, 3
...Conveyance roller, 5, 6...Pin electrode, 8...Arm,
9...Fully point, 72, 78...Net earth.

Claims (1)

[Scope of Claims] 1. A container defect inspection method for inspecting a container made of a dielectric material containing a gas and an amorphous conductive content, the method comprising: tilting the container to direct the gas upward; a first content moving step of moving the container to create a part filled with the conductive content, and forming a closed circuit between the test electrodes at the part filled with the conductive content; a first inspection step of inspecting the electrical closed circuit characteristics formed between the container and the conductive contents; and a first inspection step of inspecting the electrical closed circuit characteristics formed between the container and the conductive contents, and reversing the inclination of the container to move the gas in the opposite direction to an uninspected portion of the container. a second content transfer step to create a region filled with conductive content at the container and the conductive content at the region newly filled with the conductive content by the second content transfer step; A method for inspecting containers for defects, the method comprising: a second inspection step for inspecting electrical closed circuit characteristics formed between objects. 2. The container according to claim 1, wherein the first and second content transfer steps are carried out by setting the inclination of the conveyance path for conveying the container to a predetermined value. Defect inspection method. 3. After execution of the first inspection process, the inclination of the conveyance path is reversed to move the gas in the opposite direction, and the second inspection process is executed.
Method for inspecting containers for defects as described in section. 4. The method for inspecting containers for defects according to any of the preceding items, wherein the container is made of a flexible dielectric material that deforms into a substantially flat shape when placed on the container due to the weight of the contents. 5. A container defect inspection device for inspecting defects in containers made of dielectric material containing gas and amorphous conductive contents, which device includes a conveyance path for the container and a content moving means that moves a portion of the container filled with the conductive content according to the inclination of the container by reversing the inclination; an inspection electrode that comes into sliding contact with a surface of the container; A container characterized by having means for forming a closed circuit between test electrodes in a region filled with conductive contents and testing the characteristics of the electrical circuit formed between the container and the conductive contents. defect inspection equipment. 6. The container defect inspection device according to claim 5, wherein the conveyance path is rotatably supported by at least a predetermined angle and tilted alternately in two directions about the pivot point.