JP3940311B2 - Pinhole inspection method for insulation coating - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a method for inspecting pinholes in an insulating coating obtained by coating a conductive article such as a chemical solution, food, or other metal wire with an electrical insulating film.
[0002]
[Prior art]
Conventionally, in order to inspect pinholes in sealed packages in which chemicals, foods, and other conductive articles are encapsulated with an electrically insulating film, the object is transported on a belt conveyor and generated in the electrically insulating film part. A pinhole inspection apparatus that electrically detects such pinholes is known as disclosed in Japanese Patent Laid-Open Nos. 2001-163312 and 2001-174442. In this case, the presence / absence of the pinhole in the subject is determined so that at least the lower electrode is between the front and rear conveyors (the upper electrode is the front and rear belts) so that the electrode is brought into contact with the subject from the up and down direction of the subject moved by the conveyance. (From the upper part of the conveyor or the front and back of the upper part of the conveyor) Face the specimen path and detect whether there is a current change in the electrode contact part of the specimen due to the difference in potential. I try to detect holes.
[0003]
On the other hand, in the case of an insulated wire processed product (cut-shaped product such as U-shaped insulated wire), the test part is immersed in water, a voltage is applied between the cut end (conduction part) and water, By detecting whether or not a current change has occurred in the contact portion between the insulating film and water, pinholes in the processed insulated wire are detected.
[0004]
[Problems to be solved by the invention]
In any of the above inspection methods, even if the presence or absence of a pinhole in the electrically insulating film on the subject surface can be detected, it is completely unknown at which position the pinhole has occurred.
The present invention has been made paying attention to this point, and pinholes of insulation coverings in which electrically conductive articles such as sealed packages and insulated wire processed products are covered with an electrically insulating film, and their occurrence positions are identified. It aims to provide a method of inspection.
[0005]
[Means for Solving the Problems]
In order to achieve the above object, according to the pinhole inspection method for an insulating coating of the present invention, an insulating coating 3 in which an electrically conductive article 1 is coated with an electrical insulating film 2 is applied to a predetermined electrode plate or the like. with contacting the side surface portion 3 ₁ of the insulating coating 3 on the supporting electrode 4 shape is placed, the more high-voltage power supply 6 which is grounded at one end to support the electrode plate 4 by applying a high voltage electrical insulation film 2 While the article 1 coated with is continuously charged, the brush-like electrode 5 whose one end is grounded is brought into contact with or close to the upper surface of the insulating coating 3 while moving in the horizontal direction so that the brush-like electrode 5 is in contact with or close to it. It is detected whether or not a current change has occurred in the portion, or whether or not a spark has occurred in the portion, and the insulating coating 3 is turned upside down on the support electrode 4 to electrically insulate the coating. The article 1 coated with 2 is continuously charged, The child-like electrode 5 is moved while being in contact with or close to the upper surface of the insulating coating 3 to detect whether or not a current change has occurred in the portion where the brush-like electrode is in contact with or in close proximity, or the portion is sparked. The position of the pinhole is specified by confirming whether or not this occurs and detecting the pinhole in the insulating coating 3 covered with the electrical insulating film 2.
[0006]
In this case, when the insulating coating 3 is placed on the support electrode 4, the article 1 covered with the electrical insulating film 2 of the insulating coating 3 is applied to the support electrode 4 due to the high voltage applied to the support electrode. It is charged by a positive or negative potential of a high voltage (0.6 kv to 30 kv) to generate positive (+) ions or negative (−) ions (see FIG. 1).
[0007]
Next, when the brush-like electrode 5 whose one end is grounded is moved in the horizontal direction while being in contact with or close to the upper surface of the insulating coating 3, a pinhole is formed in the electrical insulating film 2 in which the brush-like electrode 5 is in contact with or in close proximity. When there is, discharge through the pinhole.
If there is no pinhole, the charge in the article 1 is not discharged. Therefore, by detecting this discharge current, it is detected whether or not a current change has occurred in the portion where the brush-like electrode 5 is in contact with or in proximity to the insulating coating 3 covered with the electrical insulating film 2. The position of the pinhole can be specified by detecting the pinhole (see FIG. 1). In addition, when a spark is generated at a portion where the brush-like electrode is in contact with or close to it, the pinhole can be easily detected by sound or light and the position thereof can be specified.
[0008]
In the above description, when the brush-like electrode 5 is close to the upper surface of the insulating coating 3, the position of the pinhole can be detected and the position can be specified. This means that when the insulating coating is a sealed package, the contents 1 It means that inspection is possible even if there is an air layer at the top.
[0009]
The support electrode 4, to be placed on insulating coatings 3, it is preferable to superimpose an electrical insulation plate 4 ₂ to the electrode plate 4 ₁ top.
This is because when the brush-like electrode 5 is moved in the horizontal direction while contacting the upper surface of the insulating coating 3 and inspected, the support electrode 4 connected to the high-voltage power source and the brush-like shape are inspected at the end of the coating. Although failure sensor and the electrode 5 detects the often the result supply 6 and the current change short-circuit condition causes generated, short-circuited by the electrically insulating plate 4 ₂ superimposed formed on the support electrode 4 top even if such Can be prevented and stable inspection can be performed.
Furthermore, in order to prevent a person from touching a high voltage part in the inspection, there is no danger to the person and it is safe.
[0010]
In addition, a normal brush-like electrode can be used as the brush-like electrode 5, but a contact element made of an amorphous alloy having a small thickness and a narrow rectangular cross-section with a narrow gap with a narrow gap therebetween. It is preferable to use one that is arranged and fixed in a brush shape on a holder so that current can be supplied in a single row direction (see FIG. 3).
Thereby, each contact element does not spread laterally, and the conventional brush-like electrode is prevented from being cracked in a V shape at the arc-shaped portion on the surface of the test object.
[0011]
In the present invention, in addition to the flat sealed package, the insulated wire 3 is obtained by bending and bending an insulated wire 3 in which a metal wire 1 is covered with an electrically insulating film 2 into a predetermined shape (FIG. 5). reference) is also a support electrode 4, it is possible to suitably stable inspection with those obtained by superimposing an electrical insulation plate 4 ₂ to the electrode plate 4 ₁ top (see FIG. 4).
[0012]
DETAILED DESCRIPTION OF THE INVENTION
In the present invention, a flat sealed package 3 such as a retort food to be inspected is composed of a composite film of nylon and polypropylene, or polyester and polypropylene, polyester, vinylidene chloride, and polypropylene. As the insulated wire processed material to be inspected, a metal wire 1 having a predetermined cross section, such as a rectangular shape, which is obtained by cutting an insulated wire provided with an electrical insulating film 2 and bending it into a predetermined shape is used.
Moreover, although the AC high voltage power supply 6 is used in this embodiment, the high voltage power supply 6 can also be used as a DC high voltage power supply.
Embodiments of the present invention will be described below with reference to the accompanying drawings.
[0013]
The embodiment shown in FIG. 1 is a configuration diagram of an inspection method showing the principle of the present invention when the insulating coating is a flat sealed package. The supporting electrode 4 to be brought into contact with the side surface portion 3 ₁ of the flat sealed package 3 is a flat plate having a predetermined size, for example, an aluminum plate that supports the entire side surface portion 3 ₁ of the sealed package 3. The lower part of 4 is connected to the high voltage output side terminal of the AC high voltage power supply 6 with one end on the output side grounded through a conducting wire.
[0014]
As the brush-like electrode 5 to be moved in the horizontal direction while being in contact with the upper surface of the flat sealed package 3, a normal brush-like electrode can be used, but in this embodiment, the test of the sealed package is performed. In preparation for the case where the surface has a convex surface such as an arc shape, the conventional brush-like electrode can prevent the contact element made of a thin metal wire having a circular cross section from being broken and fracturing into a V shape. A brush-like electrode 5 shown in FIG.
[0015]
This brush-like electrode 5 is a brush for energization. A contact element 5a made of an amorphous alloy having a rectangular cross section with a small thickness t and a narrow width b is connected in a narrow direction with a small gap g. Although it is used in a row state, a plurality of rows can be used.
[0016]
In the inspection, when the flat sealed package 3 is placed on the support electrode 4, the AC high voltage (for example, AC 5 kv) applied to the support electrode 4 is changed to a positive (+) or a negative (−) high potential. The contents 1 of the sealed package 3 are alternately charged with plus (+) and minus (−) through the electrically insulating film 2.
[0017]
Next, the conductor 8 is connected to the opposite side of the contact element 5a of the brush-like electrode 5 and grounded via a sensor 7 for detecting a current change, and the brush-like electrode 5 is placed on the upper surface of the flat sealed package 3. The contact element 5a is moved in the horizontal direction while contacting or approaching, and it is detected whether or not a current change has occurred in the portion of the brush-like electrode 5 where the contact element 5a is contacting or approaching. As the sensor 7, an arbitrary device such as a detection device including a current detection unit surrounding the conductive wire 8 can be used.
Further, in the inspection, the sealed package 3 is turned upside down and the inspection is performed, so that pinholes can be detected and the positions of the pinholes on both sides of the flat sealed package 3 can be easily specified.
[0018]
In the embodiment shown in FIG. 2, when the brush-like electrode 5 inspects the peripheral edge of the sealed package 3 in the inspection method shown in FIG. 1, if the tip of the connecting element 5 a of the brush-like electrode 5 is accompanied, the peripheral edge This prevents the occurrence of a short circuit accident by coming out of contact with the lower support electrode 4.
In this embodiment, the placement can support electrode 4 sealed package 3, as the electrode plate 4 ₁ to the top surface such as aluminum metal electrode plate 4 ₁ completely covers, for example, electrical insulation of the acrylic plate, etc. formed integrally by superposing the plate 4 _2.
[0019]
The embodiment shown in FIG. 4 is a configuration diagram of the inspection method of the present invention when the insulating coating is the insulated wire workpiece 3.
As the insulated wire processed product, for example, an insulated wire processed product 3 as shown in FIG. 5 is used.
[0020]
The brush-like electrode 5 to be moved in the horizontal direction while being in contact with the upper surface of the insulated wire workpiece 3 uses the same brush-like electrode 5 as in the above embodiment. Of course, the entire width of a normal brush-like electrode may be narrowed.
[0021]
As in the above-described embodiment, the conductor 8 is connected to the opposite side of the brush-like electrode 5 to the contact element 5a and grounded via the sensor 7 for detecting a current change. Next, the contact element 5a of the brush-like electrode 5 is pressed from above so as to straddle the line of the insulated wire processed product 3 as the test object, and is moved along the line in the horizontal direction. Then, the sensor 7 detects whether or not a current change has occurred in the portion of the brush electrode 5 where the contact element 5a is in contact, and the position of the pinhole at the position of the brush electrode 5 when the current change is detected. Can be specified. Next, the same inspection is performed by turning upside down. If there is a pinhole, the position can be specified. The hitting of this test, the tip of the contact element 5a of the brush-shaped electrode 5 is also in contact with the electrode plate 4 upper surface, the electrode plate 4 ₁ exposed to high potential by electrically insulating plate 4 ₂ of the electrode plate 4 top Because the contact is cut off, there is no short circuit accident.
[0022]
As described above, the article 1 covered with the electrical insulating film 2 in the insulating coating 3, that is, the content 1 when the insulating coating 3 is a sealed package, and the coated product when the insulating coating 3 is an insulated wire processed product. When the metal wire 1 is charged and the discharge current is detected and inspected, in the case of a test part, that is, in a sealed package, the electric insulating film 2 that encloses the contents 1, and in the case of an insulated wire processed product, an electric wire Since there is no pinhole in the insulating film 2 on the surface, it is impossible to detect the pinhole position by detecting the discharge current. By detecting the discharge current, the pinhole can be detected without error regardless of the atmosphere at the time of inspection. The position of the pinhole can be specified from the position 5 or by light and sound generated by spark discharge. The width of the brush-like electrode 5, and hence the arrangement width of the contact elements 5a, is not wide and the narrow one is advantageous for pinhole position specification. When the position is specified precisely, it is preferable to tilt the electrode 5 so that a part of the contact element hits it.
[0023]
In the embodiment, an AC high-voltage power supply that is advantageous as the high-voltage power supply 6 is used. However, it is of course possible to use a DC high-voltage power supply. In this case, the grounding of the DC high-voltage power supply is plus (+), minus (− ) Can be used on either side.
In addition to the above-described embodiment, the method for inspecting an insulation coating according to the present invention detects pinholes by similarly using a support electrode having an arc-shaped inner surface part for ampoules of drug drinks. The position can be specified, and various changes can be made without departing from the scope of the present invention.
[0024]
【The invention's effect】
According to the pinhole inspection method of the insulation coating of the present invention , the conventional pinhole inspection method covers electrically conductive articles such as hermetically sealed packages such as chemicals and foods and processed insulated wire products with an electrical insulating film. When inspecting pinholes in the insulation coating, the presence or absence of pinholes in the electrically insulating film on the specimen surface could be detected, but it was completely unknown where the pinholes occurred. In the invention, an electrically conductive article covered with an insulating coating placed on a support electrode plate is charged, and the brush-like electrode is moved in the horizontal direction while being in contact with or in proximity to the coated electrically insulating film surface. At the same time, it is possible to determine the position of the pinhole by detecting whether or not a current change has occurred in a portion where the brush-like electrode is in contact with or in close proximity, and flashing and sound due to the discharge of the spark, Pi By using the discharge current of the charged electric charge of the test object for the detection of the hole, it is not affected by humidity, floating fine dust and other atmosphere at the time of inspection as in the past, and it is possible to perform the process with a very simple means. Occurrence of the operation can be completely prevented to efficiently detect the pinhole of the sealed package or the insulated wire processed product and to inspect the position of the pinhole.
[0025]
According to the present invention , the brush-like electrode is brought into contact with the upper surface of the insulating coating as the test object by forming the electric insulating plate superimposed on the upper surface of the electrode plate connected to the output side of the high voltage power source as the supporting electrode of the insulating coating. When the pinhole is inspected by moving it horizontally, the brush-like electrode does not come into contact with the support electrode at the end of the insulating coating, and a stable inspection is performed. Can do. Furthermore, in order to prevent the person from touching the high voltage part during the inspection, there is no danger to the person and it is safe.
[0026]
According to the present invention , a brush-shaped electrode can be energized in a single row in a narrow direction with a small gap between a contact element made of an amorphous alloy having a small thickness and a narrow rectangular cross section as a brush-like electrode. As a result, the contact elements are not scattered in the lateral direction at the time of inspection, and it is prevented from breaking into a V shape by the subject as in the case of a conventional brush-like electrode. It can be inspected to prevent it from occurring.
[0027]
According to the present invention , in addition to a flat sealed package as an insulating coating, an insulated wire processed product obtained by bending a metal wire covered with an electrical insulating film into a predetermined shape in a flat shape is also suitably inspected. It can be a thing.
[Brief description of the drawings]
FIG. 1 is a configuration diagram of an inspection method showing the principle of the present invention according to claim 1 when the insulating coating is a flat sealed package.
FIG. 2 is a configuration diagram of an inspection method according to claim 2 in which a short circuit of a brush-like electrode when inspecting the peripheral edge of the package when the insulating coating is a flat sealed package is prevented.
FIG. 3 is an explanatory diagram of a brush-like electrode according to claim 3 showing an example of the brush-like electrode.
FIG. 4 is a configuration diagram of the inspection method of the present invention when the insulating coating is an insulated wire processed product.
FIG. 5 is an explanatory diagram showing an example of an insulated wire workpiece.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Electrically conductive article (contents, metal wire), 2 ... Electrical insulating film, 3 ... Insulating coating (flat sealed package, insulated wire processed product), 3 ₁ ... Side surface of insulating coating, DESCRIPTION OF SYMBOLS 4 ... Support electrode, 4 ₁ ... Electrode plate, 4 ₂ ... Electrical insulation board, 5 ... Brush-like electrode, 5a ... Contact element, 5b ... Holder, 6 ... High voltage power supply, 7 ... Sensor.

Claims (4)

The insulating coating 3 obtained by coating an article 1 with an electrically insulating film 2 having conductivity, placed in contact with the side surface portion 3 ₁ of the insulating coating 3 on the supporting electrode 4 having a predetermined shape of the electrode plates and the like At the same time, a high voltage is applied from the high-voltage power source 6 having one end grounded to the support electrode 4 to continuously charge the article 1 covered with the electrically insulating coating 2,
Whether or not the brush-like electrode 5 having one end grounded on the upper surface of the insulating coating 3 is moved in the horizontal direction while contacting or approaching, so that a current change occurs in a portion where the brush-like electrode 5 is in contact or in proximity. And whether or not a spark has occurred in the part,
The insulating coating 3 is turned upside down on the support electrode 4 and continuously charged on the article 1 covered with the electrical insulating film 2, and the brush-like electrode 5 is also moved while being in contact with or close to the upper surface of the insulating coating 3. Then, it is detected whether or not a current change has occurred in a portion where the brush-like electrode is in contact with or in close proximity, or whether or not a spark has occurred in the portion and covered with the electrically insulating film 2 The pinhole position is identified by detecting the pinhole in the insulation coating 3
The support electrode 4 is, can be placed the insulating coatings 3, characterized in that the electrically insulating plate 4 ₂ superimposed formed on the electrode plate 4 ₁ top, pinhole inspection method of the insulating coating. The brush-like electrode 5 is brushed on a holder 5b so that a predetermined-length amorphous alloy contact element 5a having a small thickness and a narrow rectangular cross section can be energized in a single row in a narrow direction with a small gap. Jo to the allowed sequences fixation, pinhole inspection method of the insulating coating of claim 1. The insulating covering according to claim 1 or 2 , wherein the insulating covering 3 is a flat sealed package in which a content 1 having various electrical conductivity, such as chemicals, foods, and the like, is encapsulated with an electrically insulating coating 2. Pinhole inspection method. The insulation coating according to any one of claims 1 to 3, wherein the insulation coating 3 is an insulated wire processed product obtained by bending and bending the insulated wire 3 in which the metal wire 1 is coated with the electrical insulation coating 2 into a predetermined shape. Pinhole inspection method for objects.

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