JPS59124246A - Method and device for inspecting defective vessel - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (1) Background of the Invention Technical Field The present invention relates to a method and apparatus for inspecting packages for sealing conductive contents such as Ringer's solution, liquids such as infusions, or foods. It is.

The conventional method for inspecting food packaging bodies disclosed in Japanese Patent Publication No. 1983-6998 allows inspection of only one side of the packaging body.
When changing the inspection surface, it is necessary to perform complicated operations such as inverting the package, which complicates the inspection process and the product transportation process, and poses a major obstacle to simplifying the manufacturing process.

In addition, in the configuration disclosed in Japanese Patent Publication No. 55-19490, in which two sides of a container are inspected, capacitors are inserted in series through a resistor, so one capacitor can be inspected by changing the frequency and potential value of the applied power source. There is a necessary force to short-circuit the other to the detection capacitor.This requires complicated and difficult control to make the power supply variable, and it also becomes complicated to deal with fluctuations in stray capacitance.Therefore, the detection accuracy is not reliable. It becomes something that lacks.

(II) Purpose of the Invention The present invention is proposed in view of the disadvantages of the prior art, and its purpose is to be able to inspect defects in an object to be inspected from at least two sides without rotating or reversing the object. The purpose is to propose a defect inspection device.

Another object of the present invention is to propose a failure inspection device that can use a high frequency power source that does not require complicated and difficult control, and that does not reduce detection accuracy due to stray capacitance fluctuations.

The object of the present invention is to provide a method for inspecting a container made of a dielectric material containing conductive contents, which comprises: installing first electrodes for inspection on at least two surfaces of the container; 1
A second electrode is installed in parallel with the container to form a closed circuit through the container, and the electrode and the container are arranged so that the first electrode moves on two surfaces of the container. This is achieved by a method for inspecting containers for defects, which is characterized by moving the container relatively and inspecting two sides of the container without inverting the container.

Another object of the present invention is to provide a defect inspection device for a container made of a dielectric material containing conductive contents, which includes a first electrode installed for inspection on at least two surfaces of the container; a second electrode forming a closed circuit through a container in parallel between the electrodes; and a moving means for relatively moving the electrode and the container so that the first electrode moves on two surfaces of the container. Equipped with
This is achieved by a container defect inspection device characterized by inspecting two sides of the container without inverting the container. This defect inspection device detects a capacitance of such a size that the impedance of the capacitance formed between the second electrode and the container is negligible compared to the impedance of the capacitance formed between the first electrode and the container. The first electrode is configured to follow the shape of the container and be biased by a spring force that causes it to slide against the outer surface of the container. Moreover, specifically, the moving means forms a second electrode, and at least two of the containers are moved without inverting the container while moving in one direction on the second electrode.
The container used here is a flexible container containing a conductive liquid.

([1) Detailed description of the invention Examples of the present invention will be described in detail below.

In FIG. 1 showing the conceptual configuration of an embodiment of the present invention,
Reference numeral 1 designates an electroconductive infusion bag made of a dielectric material such as polypropylene and containing Ringer's solution 2, for example. Reference numeral 3 denotes a conveyance roller section, which includes a plurality of conveyance ports driven by a driving source (not shown) to convey the infusion bag l in the direction of the arrow in the figure, except for insulated rollers 3b and 3C. The roller is a conductive roller. 5 and 6 are approximately 3 to 5 mm across the entire width of the upper and lower surfaces of the infusion bag 1.
A plurality of pin electrodes are in sliding contact with each other at intervals of .

Reference numeral 7 denotes an air cylinder, which urges the arm 8 clockwise or counterclockwise about 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, the air lO in the infusion bag moves to the top or bottom of the infusion bag, as shown.

In the above configuration, the pin electrodes 5.6 facing from the upper and lower surfaces of the infusion bag l are in contact with the dielectric infusion bag l over a small area, so that the capacitance of the formed capacitor is small. 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, the conductive rollers 3a and 3d are used as ground electrodes, and the electrodes 5.
When a high frequency current is applied between the ground electrode and the ground electrode, the impedance formed by the ground electrode becomes negligible. This electrical configuration is shown in FIG. 3 and will be described in detail. In FIG. 3, R1 is the distributed resistance of the liquid between the Ringer's solution 2 through the infusion bag 1 of the electrode 6 and the ground electrode 3d. R2 is the distributed resistance of the liquid through the infusion bag 1 of the electrode 6 and between the gel solution 2 and the ground electrode.

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 Figure 3,
The capacitor C1 is formed by a conductive roller 3a serving as a ground electrode, an infusion bag 1 serving as a dielectric, and 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 C
3 is formed by the electrode 5, the infusion bag 1 which is a dielectric material, and the liquid inside. A capacitor C4 connected in parallel with capacitor C3 is formed by the electrode 6, the bag 1 and the liquid inside. In such a configuration, the value of capacitor C3+04 is very small, so the impedance is high, while the value of capacitor CI+C'l is very large, so the equivalent circuit is as shown in FIG.

Now, if there are no defects such as pinholes or cracks on the inspection surface of the infusion bag l, which is the inspection control.

Since the capacitance of capacitors C3 and C4 is very small, the impedance is high, and high voltage and high frequency power supply, resistors R1 to R4+
Only a dark current flows through the closed circuit formed by capacitors C3 and C4. On the other hand, if there is a defect such as a pinhole, flashing etc. will occur in the defective part of the film, and the impedance of capacitor C3 or C4 will be drastically reduced, and the impedance will be almost equal to the resistance Rr//R2, R3/' Only R4 will be available. As mentioned above, the resistance Rr //' R2, R
3// Since Ra is the resistance of a conductive liquid such as Ringer's solution 2, the resistance value is low. Therefore, when a leak occurs in the capacitor C3 or C4, the high frequency current increases. If this phenomenon is detected by the detector 20, two
It becomes possible to detect surface defects.

Next, air 1O is sealed in the infusion bag 1 together with Ringer's solution. If the air IO is located under the electrode 5 during the test, even if a leak occurs in the capacitor C3+04, the current passing through the capacitor will be blocked by the high impedance of the thick air layer. That is, the closed circuit that should be formed by the power source, resistor, and capacitor is interrupted by the air layer. Therefore, defects such as pinholes on the air layer cannot be detected, leading to incorrect testing. 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 the IsZ diagram is called a second state.

In the first state, due to its inclination, the infusion bag 1 is tilted upward to the left, so the air 1O moves to the upper end of the lower part of the bag, and the middle part of the infusion bag 1 except for the lower part and the right half of the bag at the mouth are conductive. The equivalent circuit shown in FIG. 5 is formed.

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 photointerrupter or microswitch detects that the infusion bag has moved forward at the position indicated by the arrow 11, pressurized air is supplied to the air cylinder 7, Drive the plunger. The conveyor 3 is driven counterclockwise around the fulcrum 9 by the plunger. As a result, the transport section is in the second upward-sloping state, and the air lO 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 L, and the conditions of the equivalent circuit shown in Figure 5 are formed, and defects such as pinholes existing in this area can be correctly detected. Become.

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 m1, and A spring 55 hooked between the bottle 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 inspection object passing under the electrode 5, the electrodes 5□ to 57
moves up and down and slides on the surface of the object to be inspected. Here, the reason why the electrodes 51 to 57 are arranged with 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 spread. It lies in having. Therefore, by arranging the pin electrodes at predetermined intervals, an electric field can be applied throughout the dielectric infusion bag. The electrode 5.6 is an electrode guide 56 fixed to an inspection table (not shown) in FIGS. 6 and 7.
The distance is regulated to a predetermined interval. As shown in the figure, the electrode guide 56 is inserted between the respective pin electrodes 51 to 57 so as to sandwich them therebetween.

In the above explanation, among the high voltage and high frequency waves applied to the detection circuit, the voltage refers to the voltage that does not cause discharge damage to a bag of normal thickness, and the frequency refers to the voltage of the capacitor C3 + C.
4 refers to the frequency that allows a sufficient current to flow through the detection circuit when a leak occurs. Specifically speaking, the thickness of the sheet of an infusion bag is usually about 400mm, but for example, if the thickness is poor and the thickness is 60 Tsu U is 55 at 15kv (7) voltage.
Of the examples, 24 had dielectric breakdown and were detected as defective.

Furthermore, in the above description, a mode has been described in which the 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 also present as a dielectric, the capacitor C5+ C shown by the broken line
6 is formed.

Therefore, the current may be detected by taking these capacitors C5 and C6 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 an inspection device is used in an inspection step 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 the examination table 62. The inspection table 62 is held at two positions, an upward left position and an upward right position, by air cylinders shown in FIGS. 1 and 2, with the fulcrum 64 as the center. From 70-0 to 70-6, reference numeral 66 indicates a state rotated by the rotary lens to the upper left position, and reference numeral 68 indicates a state rotated to the upper right position.
is a rubber roll that drives the net earth which becomes the earth electrode for forming the capacitor CI. 74-1.7
4-2 is an insulating roll. 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 l. Electrode 5 faces from the opposite side so as to almost oppose electrode 6, and 76-0 to 76-7 form a net ground 78 forming capacitor C2.
It is a rubber roll that drives the Net Earth 72.78
is pulley 80. It is rotated by a drive motor (not shown) provided via a clutch 82 and belts 84 and 86 to transport the infusion bag. 88 is the earth electrode 76-〇 and 76-
This is a photocoupler for detecting the transport position of the infusion bag installed between the two.

Next, to explain in detail the operation of the embodiment shown in FIG.
The inspection table 62 is set upward to the left as shown in FIG. Therefore, the conveying surface of the infusion bag l conveyed by the rollers 60 and the surface of the inspection table become a nearly continuous conveying surface, which is convenient for conveying objects with liquid contents such as infusion bags that are easily broken. The infusion bag l transported by the net earth 72 driven by the electrode 5.6 that is in sliding contact with the entire surface of the upper and lower surfaces and the net earth 72 that forms the earth electrode constitutes a closed circuit, preventing cracks, pinholes, etc. ＃When there is a liquid discharge, a flash occurs, and if the infusion bag does not have the normal thickness due to some reason, the damage caused by electrical discharge may occur as shown in Figures 4 and 5. One or both of capacitors C3 and C4 shown in FIG. The current flowing at this time may be detected by the detector 20.

The completion of the inspection of both the top and bottom of the front half of the infusion bag in this way is detected by the photo-in club installed between the rubber rolls 76-0 and 76-1, and is shown in Figures 1 and 2. Air is supplied from a pressure source to the air cylinder shown to drive the plunger.1. Inspection table 62
Move to the upper right corner. A state equivalent to this state is shown in FIG. As can be understood from FIG. 2, the air inside the infusion bag l moves to the vicinity of the mouth of the bag, and the circuit conditions shown in FIG. 5 are satisfied from the middle to the bottom where the test will be performed. 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 test has been completed, the infusion bag rides onto a 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.

The configuration shown in FIG. 8 shows a preferred configuration, but as shown in FIGS. 6 and 7, an electrode 5 is placed in sliding contact with the infusion bag by a spring 55 near the center of rotation of the rotating examination table.
, 6 are preferably gathered together.

(IV) Specific Effects of the Invention As described above, according to the present invention, defects in a container made of a galvanic material containing conductive contents can be inspected with high accuracy without inverting the container. Therefore, even if the inspection device of the present invention is interposed in the product manufacturing process, the manufacturing process will not become complicated.
It is possible to remove to the maximum extent defective products that may have the possibility of invasion of germs or corrosion of the contents, and it is possible to maximize the warranty for the product.

In addition, as in the embodiment, this inspection device is inserted into the inspection process, which is the first step of the product manufacturing process, and the product moving means 1, which can obtain a large surface contact, for example, a net ground, a conductive roller, etc. is connected to the ground electrode. If used as a second electrode, it is also possible to use an existing second electrode.

If the first electrode is an electrode biased by a spring force that slides against the outer surface of the container while following the shape of the container, it becomes possible to flow containers of various sizes and shapes on the same line.

Furthermore, the moving means serves as a second electrode, and at least two surfaces can be inspected while moving in one direction on the electrode, so that the container to be inspected contains a liquid that deforms when a force is applied to a portion thereof. It may also be a flexible container. In other words, various types of containers can be inspected.

[BRIEF DESCRIPTION OF THE DRAWINGS] FIGS. 1 and 2 are diagrams conceptually showing one embodiment of the present invention, and FIGS. 3 and 4 are diagrams showing the electrical structure shown in FIGS. 1 and 2. The equivalent circuit diagram, Figure 5, is the capacitor CI + C, taking into account the characteristics from Figure 4.
Fig. 1 is an electrical equivalent circuit diagram of Fig. 2 with 2 removed, Fig. 6 is a plan view showing the structure of the pin electrode with the electrode section taken out, and Fig. 7 is a side view of Fig. 6. FIG. 8 is a side view showing an inspection device according to an embodiment of the present invention installed in a product manufacturing line. Here, 1... Infusion bag, 2... Ringer's solution, 3
... Conveyance roller, 5.6 ... Pin electrode, 8 ... Arm, 9 ... Fulcrum, 72.78 ... Net anise. Figure 4 Figure 5

Claims (6)

[Claims] (1) A method for inspecting a container made of a dielectric material containing conductive contents, comprising: installing first electrodes for inspection on at least two sides of the container; A second electrode that constitutes a closed circuit between the electrode and the container is installed in parallel with the container, and the electrode and the container are arranged so that the first electrode moves on two surfaces of the container. 1. A method for inspecting containers for defects, characterized in that two sides of the container are inspected without inverting the container by relatively moving the container. (2) A defect inspection device for a general container made of a dielectric material containing conductive contents, wherein a first electrode installed for inspection on at least two sides of the container and the electrode are provided. a second electrode constituting a closed circuit via a container in parallel with the container; and a moving means for relatively moving the electrode and the container so that the first electrode moves between two sides of the refrigerator. What is claimed is: 1. A container defect inspection device, characterized in that it inspects two sides of a container without inverting the container. (3) The capacitance formed between the second electrode and the container is set to a size that is negligible compared to the impedance that is suspected to be formed between the first electrode and the container. The container defect inspection device according to claim 2, characterized in that: (4) A defect in the container according to claim 2, wherein the first electrode is an electrode biased by a spring force that slides into contact with the outer surface of the container while conforming to the shape of the container. Inspection equipment. (5) The moving means forms a second electrode and inspects at least two sides of the container while moving in one direction over the second electrode without inverting the container. A container defect inspection device according to scope 2. (6) The container defect inspection device according to claim 2, wherein the container is a flexible container containing a conductive liquid.