CN109799280A - The Pinhole detecting device and method of plastic film - Google Patents
The Pinhole detecting device and method of plastic film Download PDFInfo
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- CN109799280A CN109799280A CN201711128383.0A CN201711128383A CN109799280A CN 109799280 A CN109799280 A CN 109799280A CN 201711128383 A CN201711128383 A CN 201711128383A CN 109799280 A CN109799280 A CN 109799280A
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- detecting electrode
- high voltage
- voltage detecting
- plastic film
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- 239000002985 plastic film Substances 0.000 title claims abstract description 50
- 229920006255 plastic film Polymers 0.000 title claims abstract description 50
- 238000000034 method Methods 0.000 title claims abstract description 16
- 238000001514 detection method Methods 0.000 claims abstract description 23
- 239000000835 fiber Substances 0.000 claims description 8
- 229910052751 metal Inorganic materials 0.000 claims description 8
- 239000002184 metal Substances 0.000 claims description 8
- 238000009659 non-destructive testing Methods 0.000 abstract description 2
- 239000004033 plastic Substances 0.000 description 4
- 229920003023 plastic Polymers 0.000 description 4
- 229910052782 aluminium Inorganic materials 0.000 description 2
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 239000000463 material Substances 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- 239000004411 aluminium Substances 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 230000015556 catabolic process Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 239000003814 drug Substances 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004047 hole gas Substances 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 238000004806 packaging method and process Methods 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
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- Other Investigation Or Analysis Of Materials By Electrical Means (AREA)
- Investigating Or Analyzing Materials By The Use Of Electric Means (AREA)
Abstract
The present invention relates to the Pinhole detecting device of plastic film and methods, and plastic film is passed through between positive and negative detecting electrode.Wherein positive detecting electrode is connected with the anode of high pressure generator, is connected after negative detecting electrode access current detection means with high pressure generator cathode.High pressure generator generates 1KV-40KV high-frequency high-voltage according to the thickness of plastic film, when there are when pin hole for the plastic film between positive and negative electrode, positive and negative detecting electrode punctures atmospherical discharges by pin hole, and current detection means detects the variation of electric current, to detect the presence of needle outlet.This method has the online non-destructive testing of high speed, and precision is high, the features such as influence by film surface pattern.
Description
Technical field
The present invention relates to a kind of Pinhole methods of plastic film, specifically a kind of to pass through setting electrode detection plastics
The method of film pin hole.
Background technique
Shared share is increasing on the market for current plastic packet product, especially composite plastic flexible package,
The fields such as food, medicine, chemical industry are widely used in, wherein again maximum with food packaging proportion.Plastic film is producing
There may be needle pore defects in the process, and this defect will lead to the pollution of packaged product, go bad, and cause food safety hidden
Suffer from.
Currently, the Pinhole method to plastic film mainly uses machine vision detection method, i.e., light source is placed in
Below tested film, film is illuminated, industrial camera is placed in above film and takes pictures, bright according to tested on piece flaw and normal piece
The difference of degree, to detect flaw.
Existing detection method is influenced by factors such as light-source brightness, camera resolution, the plastic film speeds of service,
And it will be unable to detect when Plastic film surface is printed on pattern.
Summary of the invention
Place in response to the deficiencies in the existing technology, the technical problem to be solved by the present invention is to propose that one kind can be to plastics
Film carries out high speed, high-precision and the Pinhole method not influenced by film surface pattern.Sealed package proposed by the present invention
The Pinhole method applicable elements of object are that detected plastic film should have the electric breakdown strength higher than air.
The technical solution adopted by the present invention to solve the technical problems is: the Pinhole detecting device of plastic film, comprising: just
High pressure detecting electrode, negative high voltage detecting electrode, high pressure generator and current detection means；
The positive high voltage detecting electrode, negative high voltage detecting electrode are staggered relatively, and negative high voltage detecting electrode and current detecting fill
Set connection, the anode connection of positive high voltage detecting electrode and high pressure generator；The high pressure generator cathode and current detection means
Connection；Positive high voltage detecting electrode is under, and negative high voltage detecting electrode is upper；Between positive high voltage detecting electrode, negative high voltage detecting electrode
For film to be arranged.
The positive high voltage detecting electrode is cylindrical metal roller.
The negative high voltage detecting electrode is the brush loading electrode equipped with conductive fiber bristle；The bristle of brush loading electrode be set to just
Film contacts on high pressure detecting electrode.
Negative high voltage detecting electrode spacing between metal electrode without bristles, with positive high voltage detecting electrode is 1mm-
2mm。
The Pinhole method of plastic film, comprising the following steps:
Positive high voltage detecting electrode, negative high voltage detecting electrode is staggered relatively, and plastic film is placed in positive high voltage detecting electrode, bears
Between high pressure detecting electrode；Positive high voltage detecting electrode is under, and negative high voltage detecting electrode is upper；
High pressure generator generates high-frequency and high-voltage, is applied to positive high voltage detecting electrode, on negative high voltage detecting electrode；
When curent change is not detected in current detection means, then show that high pressure can not puncture plastic film, positive high voltage detection
Plastic film between electrode, negative high voltage detecting electrode does not have pin hole；When current detection means detects curent change, then show height
Pressure punctures air by pin hole and forms electric discharge, and the plastic film between positive high voltage detecting electrode, negative high voltage detecting electrode has pin hole.
The high-frequency and high-voltage is that frequency is 1KV-40KV voltage between 20KHz~50KHz.
The invention has the following beneficial effects and advantage:
1. the present invention can be realized to the high speed of plastic film lossless Pinhole online.
2. the present invention can detecte out the small pin hole that diameter is less than 0.5um, precision is high.
3. the present invention is not influenced by light, Plastic film surface color pattern.
4. the positive and negative detecting electrode of the present invention is respectively smooth metal and soft conductive fiber, contacted not with plastic film
Scratch can be generated to film.
5. this method has the online non-destructive testing of high speed, precision is high, the features such as influence by film surface pattern.
Detailed description of the invention
Fig. 1 is positive detecting electrode；
Fig. 2 is negative detecting electrode；
Fig. 3 is the structure chart of the Pinhole method of plastic film of the present invention.
Specific embodiment
The present invention will be further described in detail below with reference to the embodiments.
As shown in Figure 1-Figure 3, two high pressure detecting electrodes are staggered relatively, under, negative detecting electrode exists positive detecting electrode
On.Plastic film passes through between positive and negative detecting electrode.Positive detecting electrode is cylindrical metal roller, is placed in below plastic film,
It is in close contact with Plastic film surface, positive detecting electrode is connected by high-voltage line with high pressure generator anode；Negative detecting electrode is
The brush loading electrode being made of conductive fiber is placed in above plastic film, and conductive fiber is contacted with Plastic film surface, bears detection electricity
Pole is connected by high-voltage line with current detection means, and current detection means is connected by high-voltage line with the cathode of high pressure generator.
1. anode uses the metallic roll of stainless steel material, cathode is made of the hairy conductive carbon fibre planted on aluminium block
Brush electrode, positive and negative electrode is staggered relatively.Film is contacted by passing through between two electrodes with positive and negative anodes.
2. positive and negative electrode is all aluminum rectangle metal block, positive and negative electrode is staggered relatively.Film by passing through between two electrodes,
It is not contacted with positive and negative electrode, two electrodes are at a distance of about 1-2 millimeters.
High pressure generator generates the high-frequency and high-voltage of 1KV-40KV according to the thickness for being detected plastic film, is applied to positive and negative inspection
It surveys on electrode, when the plastic film between positive and negative detecting electrode does not have pin hole, high pressure can not puncture plastic film, current detecting dress
Set the variation that can't detect electric current；When the plastic film between positive and negative detecting electrode is there are when pin hole, high pressure is punctured empty by pin hole
Gas forms electric discharge, and current detection means detects the variation of electric current, to detect the presence of needle outlet.
Puncture air when film has hole, between positive and negative electrode and form electric discharge, can generate dash current, current strength can be with
The correlated current sensor of driving current detection device, output signal；When film is non-porous between positive and negative electrode without loop current or
Atomic weak current, current strength can not drive current sensor, non-output signal.
Plastic film with a thickness of 0.05-2 millimeters.
Embodiment 1
As shown in figure 3, positive or negative high voltage detecting electrode U1, U2 is staggered relatively, positive detecting electrode U1 is under, negative detecting electrode
U2 is upper.Plastic film U3 passes through between positive and negative detecting electrode U1, U2.Positive detecting electrode U1 is cylindrical metal roller, is placed in
Below plastic film U3, with plastic film U3 intimate surface contact, positive detecting electrode U1 passes through high-voltage line and high pressure generator U4
Anode is connected；The brush loading electrode that negative detecting electrode U2 is made of conductive fiber U5 is placed in above plastic film U3, conductive fiber
U5 is contacted with the surface plastic film U3, and negative detecting electrode U2 is connected by high-voltage line with current detection means U6, current detecting dress
U6 is set to be connected by high-voltage line with the cathode of high pressure generator U4.
High pressure generator U4 generates the high-frequency and high-voltage of 1KV-40KV, film thickness according to the thickness for being detected plastic film U3
Every increase 0.05mm, voltage increase 1KV, are applied on positive and negative detecting electrode U1, U2, the modeling between positive and negative detecting electrode U1, U2
When material film U3 does not have pin hole, high pressure can not puncture plastic film U3, and current detection means U6 can't detect the variation of electric current；When
For plastic film U3 between positive and negative detecting electrode U1, U2 there are when pin hole, high pressure punctures air by pin hole, forms electric discharge, electric current
Detection device U6 detects the variation of electric current, to detect the presence of needle outlet.
Claims (6)
1. the Pinhole detecting device of plastic film, characterized by comprising: positive high voltage detecting electrode, negative high voltage detecting electrode, height
Press generator and current detection means；
The positive high voltage detecting electrode, negative high voltage detecting electrode are staggered relatively, and negative high voltage detecting electrode and current detection means connect
It connects, the anode of positive high voltage detecting electrode and high pressure generator connects；The high pressure generator cathode is connect with current detection means；
Positive high voltage detecting electrode is under, and negative high voltage detecting electrode is upper；For setting between positive high voltage detecting electrode, negative high voltage detecting electrode
Set film.
2. the Pinhole detecting device of plastic film according to claim 1, it is characterised in that the positive high voltage detecting electrode
For cylindrical metal roller.
3. the Pinhole detecting device of plastic film according to claim 1, it is characterised in that the negative high voltage detecting electrode
For the brush loading electrode equipped with conductive fiber bristle；The bristle of brush loading electrode and the film contacts being set on positive high voltage detecting electrode.
4. the Pinhole detecting device of plastic film according to claim 1, it is characterised in that the negative high voltage detecting electrode
Spacing is 1mm-2mm between metal electrode without bristles, with positive high voltage detecting electrode.
5. the Pinhole method of plastic film, it is characterised in that the following steps are included:
Positive high voltage detecting electrode, negative high voltage detecting electrode is staggered relatively, and plastic film is placed in positive high voltage detecting electrode, negative high voltage
Between detecting electrode；Positive high voltage detecting electrode is under, and negative high voltage detecting electrode is upper；
High pressure generator generates high-frequency and high-voltage, is applied to positive high voltage detecting electrode, on negative high voltage detecting electrode；
When curent change is not detected in current detection means, then show that high pressure can not puncture plastic film, positive high voltage detecting electrode,
Plastic film between negative high voltage detecting electrode does not have pin hole；When current detection means detects curent change, then show that high pressure is logical
Needle passing hole punctures air and forms electric discharge, and the plastic film between positive high voltage detecting electrode, negative high voltage detecting electrode has pin hole.
6. the Pinhole method of plastic film according to claim 5, it is characterised in that the high-frequency and high-voltage is frequency
1KV-40KV voltage between 20KHz~50KHz.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711128383.0A CN109799280A (en) | 2017-11-15 | 2017-11-15 | The Pinhole detecting device and method of plastic film |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201711128383.0A CN109799280A (en) | 2017-11-15 | 2017-11-15 | The Pinhole detecting device and method of plastic film |
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| Publication Number | Publication Date |
|---|---|
| CN109799280A true CN109799280A (en) | 2019-05-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201711128383.0A Pending CN109799280A (en) | 2017-11-15 | 2017-11-15 | The Pinhole detecting device and method of plastic film |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794031A (en) * | 2019-11-13 | 2020-02-14 | 山东天海新材料工程有限公司 | Online leakage point detection device for geomembrane |
| CN114486129A (en) * | 2022-01-18 | 2022-05-13 | 广州博联思医疗技术有限公司 | Method for testing porous plate by high-pressure ionization method |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0480655A (en) * | 1990-07-23 | 1992-03-13 | Nippon Steel Corp | Pinhole detector for insulation film |
| JPH11218523A (en) * | 1998-02-03 | 1999-08-10 | Asahi Chem Ind Co Ltd | Method and apparatus for detection of pinhole of film |
| JP2001188062A (en) * | 1999-12-28 | 2001-07-10 | Asahi Kasei Corp | Method and apparatus for detection of pinhole |
| US20030062919A1 (en) * | 2001-09-28 | 2003-04-03 | Vargas Leroy C. | Method and apparatus for detecting pinhole defects in a dielectric layer |
| JP2003307509A (en) * | 2002-04-15 | 2003-10-31 | Jiyooben Denki Kk | Pinhole inspection method for insulating covering material |
| JP2011064556A (en) * | 2009-09-16 | 2011-03-31 | Mutual Corp | Inspection device of sealed package |
| CN103162921A (en) * | 2011-12-12 | 2013-06-19 | 中国科学院沈阳自动化研究所 | Pinhole detection method for sealed package |
| WO2013168204A1 (en) * | 2012-05-11 | 2013-11-14 | 三菱電線工業株式会社 | Spark tester |
-
2017
- 2017-11-15 CN CN201711128383.0A patent/CN109799280A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0480655A (en) * | 1990-07-23 | 1992-03-13 | Nippon Steel Corp | Pinhole detector for insulation film |
| JPH11218523A (en) * | 1998-02-03 | 1999-08-10 | Asahi Chem Ind Co Ltd | Method and apparatus for detection of pinhole of film |
| JP2001188062A (en) * | 1999-12-28 | 2001-07-10 | Asahi Kasei Corp | Method and apparatus for detection of pinhole |
| US20030062919A1 (en) * | 2001-09-28 | 2003-04-03 | Vargas Leroy C. | Method and apparatus for detecting pinhole defects in a dielectric layer |
| JP2003307509A (en) * | 2002-04-15 | 2003-10-31 | Jiyooben Denki Kk | Pinhole inspection method for insulating covering material |
| JP2011064556A (en) * | 2009-09-16 | 2011-03-31 | Mutual Corp | Inspection device of sealed package |
| CN103162921A (en) * | 2011-12-12 | 2013-06-19 | 中国科学院沈阳自动化研究所 | Pinhole detection method for sealed package |
| WO2013168204A1 (en) * | 2012-05-11 | 2013-11-14 | 三菱電線工業株式会社 | Spark tester |
Non-Patent Citations (2)
| Title |
|---|
| YOON S. SONG, ET AL.: "Evaluation of a Non-destructive High-voltage Technique for the Detection of Pinhole Leaks in Flexible and Semi-rigid Packages for Foods", 《PACKAGING TECHNOLOGY AND SCIENCE》 * |
| 孙宪明 等: "一种新颖的致密膜针孔检测方法", 《膜科学与技术》 * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110794031A (en) * | 2019-11-13 | 2020-02-14 | 山东天海新材料工程有限公司 | Online leakage point detection device for geomembrane |
| CN114486129A (en) * | 2022-01-18 | 2022-05-13 | 广州博联思医疗技术有限公司 | Method for testing porous plate by high-pressure ionization method |
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Application publication date: 20190524 |