CN103308548A - Measuring method of thermal shrinkage rate of cigarette packaging film - Google Patents
Measuring method of thermal shrinkage rate of cigarette packaging film Download PDFInfo
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- CN103308548A CN103308548A CN2013102819639A CN201310281963A CN103308548A CN 103308548 A CN103308548 A CN 103308548A CN 2013102819639 A CN2013102819639 A CN 2013102819639A CN 201310281963 A CN201310281963 A CN 201310281963A CN 103308548 A CN103308548 A CN 103308548A
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Abstract
The invention discloses a measuring method of a thermal shrinkage rate of a cigarette packaging film. The measuring method is characterized by comprising the steps that an image acquisition device acquires dimension parameters of the cigarette packaging film before and after certain temperature and time processing in a heating medium; images are preprocessed; boundaries of the cigarette packaging film before and after shrinkage are fitted out by image analysis software; dimension variations of the cigarette packaging film are measured by using image measuring software; and longitudinal, transverse and overall thermal shrinkage rates of the cigarette packaging film are obtained after computation. According to the measuring method, the images before and after the shrinkage of the cigarette packaging film can be extracted and subjected to necessary image preprocessing and image analysis, and the dimension parameters of the cigarette packaging film can be extracted, so that the thermal shrinkage rate of the cigarette packaging film can be accurately measured. According to the measuring method, an influence of manual measuring on a testing result in an existing method can be avoided and a personal error can be eliminated; and the measuring procedure is fully automatic, so that the measuring accuracy and the measuring precision can be improved.
Description
Technical field
The present invention relates to the plastic sheeting technical field of measurement and test, specifically a kind of cigarette packaging film percent thermal shrinkage measuring method based on machine vision technique.
Background technology
Cigarette packaging film claims again " bidirectional stretching polypropylene film ", being called for short the cigarette film, is by multiple polypropylene functional material co-extrusion, drawing and forming, has the high grade of transparency and glossiness, material non-toxic, molecular structure stabilized have the wrappage of certain barriers function to smell and moisture.Cigarette packaging film generally is divided into two kinds of general thin and shrinkable films.Shrinkable film has good high-speed cruising, good optical property and excellent heat sealability, and has higher shrinkage factor to have the good effect of being close to guarantee packing.Percent thermal shrinkage is an important technology index of shrinkable film, refers to film under the uniform temperature condition and the rate of change of time inside dimension, and suitable percent thermal shrinkage can make that packing is compact fits, and can keep the attractive in appearance of the packing of product again when guaranteeing the parcel effect.
The assay method of cigarette packaging film percent thermal shrinkage, mainly contain two kinds, a kind of be with film under the formulation condition heating after, use Steel Ruler to measure respectively the size of vertical and horizontal, relatively obtain percent thermal shrinkage with size before the contraction, another is that film is fixed in the heating medium by certain holding force, calculates percent thermal shrinkage by calculating the variation of shrinking foe and aft force or displacement.All there is certain problem in these two kinds of methods, and the former uses Steel Ruler to measure the vertical and horizontal size in contraction front and back, because film is different in the shrinkage degree of each direction, therefore, the center size can not represent whole size, so has testing differentia.The latter can affect the shrinkage degree of film, and then affect the test result of percent thermal shrinkage because film has been applied external force.
Summary of the invention
Purpose of the present invention just be based on above-mentioned prior art situation and the special a kind of cigarette that proposes with packing the percent thermal shrinkage measuring method, utilize the present invention can shrink by extracting cigarette packaging film the image of front and back, through necessary image pre-service and graphical analysis, extract the dimensional parameters of cigarette packaging film, thereby accurately measure the percent thermal shrinkage of cigarette packaging film.
The objective of the invention is to be achieved through the following technical solutions:
Cigarette packaging film percent thermal shrinkage measuring method of the present invention, it is the dimensional parameters that is captured in the heating medium cigarette packaging film before and after processing through uniform temperature and time by image collecting device, after image carried out pre-service, simulate the cigarette packaging film border of shrinking front and back by image analysis software, the change in size of use image measurement software measurement cigarette packaging film is through obtaining vertical, the horizontal and overall thermal shrinkage factor of cigarette packaging film after calculating.
The concrete steps of measuring method of the present invention are as follows:
1) cigarette packaging film is cut into certain size, long 50mm～300mm, wide 50mm～300mm;
2) packaging film is placed under the pressure sampling device, smooth to guarantee film;
3) gather the cigarette packaging film image by image collecting device, simulate the packaging film border by image analysis software, use image measurement software measurement longitudinal length L
1, lateral length W
1, area S
1
4) packaging film is placed under 120 ℃ temperature, heats 20s～5 min in the heating medium;
5) from heating medium, take out cigarette packaging film, be placed into after the cooling and press under the sampling device, keep smooth;
6) by the packaging film image after the image collecting device collection contraction, simulate the packaging film border by image analysis software, use image measurement software measurement longitudinal length L
2, lateral length W
2, area S
2
7) calculate vertical percent thermal shrinkage T according to formula (1)
1, calculate horizontal percent thermal shrinkage T according to formula (2)
2, calculate overall thermal shrinkage factor T according to formula (3)
3
?…………………………（1）
T
1Vertical percent thermal shrinkage;
L
1Longitudinal length before shrinking;
L
2Longitudinal length after shrinking;
T
2Horizontal percent thermal shrinkage;
W
1Lateral length before shrinking;
W
2Lateral length after shrinking;
T
3The overall thermal shrinkage factor;
S
1Area before shrinking;
S
2Area after shrinking;
Pressure sampling device among the present invention can be the framework that a kind of dark hard material of color homogeneous of groined type forms, its effect is the smooth of film when guaranteeing image acquisition, press the image of sampling device to shield by image processing software, also can when match, directly ignore.
In the present invention, image analysis software comprises and can carry out process of fitting treatment to the out-of-flatness border of the image that obtains, make its software that becomes a straight boundary or image analysis processing module, image analysis software can adopt the image analysis function among Motic2.0 image analysis software, the image analysis software V4.7 of Daheng or the MATLAB 8.0.
In the present invention, image measurement software comprises software or the image measurement module that can carry out size and area measurement to the sample image after processing, and image measurement software can adopt the image measurement function among Motic2.0 image measurement software, the image analysis software V4.7 of Daheng or the MATLAB 8.0.
Heating medium among the present invention comprises the heating mediums such as air dry oven, hot plate, hot liquid that can carry out to sample certain hour heating under design temperature.
Compared with prior art, the percent thermal shrinkage that adopts method of the present invention to measure cigarette packaging film has following advantage:
1) the cigarette packaging film percent thermal shrinkage measuring method that proposes of the present invention can avoid in the existing method manual measurement that personal error is eliminated in the impact of test result.
2) the cigarette packaging film percent thermal shrinkage measuring method of the present invention's proposition can be applicable to existing heat treated instrument, can avoid overlapping investment.
3) the cigarette packaging film percent thermal shrinkage measuring method of the present invention's proposition, test speed is fast, and test data is comprehensive, helps to fully understand the percent thermal shrinkage parameter of cigarette packaging film.
4) the cigarette packaging film percent thermal shrinkage measuring method of the present invention's proposition, the measuring process full automation is processed, and can improve accuracy and the measuring accuracy of measurement.
Description of drawings
Fig. 1 is the testing process schematic diagram of measuring method of the present invention.
Fig. 2 is the instrumentation plan of measuring method of the present invention.
Fig. 3 is pressure sampling device schematic diagram of the present invention.
?
Embodiment
The present invention is described further below in conjunction with embodiment:
Embodiment 1
1, cigarette packaging film is cut into the square of length of side 50mm;
2, packaging film is placed under the pressure sampling device, keeps film smooth;
3, by gathering the cigarette packaging film image through the CCD imaging device of demarcating, use the Motic2.0 image analysis software to simulate the packaging film border, use vertically long 50.1mm of Motic2.0 image measurement software measurement, horizontal long 50.0mm, area 2505mm
2
4, packaging film is placed in the air dry oven heating 5 min under 120 ℃ temperature;
5, from air dry oven, take out cigarette packaging film, be placed into after the cooling and press under the sampling device, keep smooth;
6, by the packaging film image after shrinking through the CCD imaging device collection of demarcating, simulate the packaging film border by the Motic2.0 image analysis software, use vertically long 47.8mm of Motic2.0 image measurement software measurement, horizontal long 47.0mm, area 2247mm
2
7, calculating vertical percent thermal shrinkage according to formula (1) is 4.6%, and calculating horizontal percent thermal shrinkage according to formula (2) is 6.0%, and calculating the overall thermal shrinkage factor according to formula (3) is 10.3%.
Embodiment 2
1, cigarette packaging film is cut into the square of length of side 50mm;
2, packaging film is placed under the pressure sampling device, keeps film smooth;
3, gather the cigarette packaging film image by digital camera, use the shielding of Motic2.0 image analysis software to press the image of sampling device, re-use software and simulate the packaging film border, use vertically long 510 pixels of Motic2.0 image measurement software measurement, laterally long 500 pixels, area 510 pixels * 500 pixels;
4, packaging film is placed in the air dry oven heating 5 min under 120 ℃ temperature;
5, from air dry oven, take out cigarette packaging film, be placed into after the cooling and press under the sampling device, keep smooth;
6, by the packaging film image after the digital camera collection contraction, use the shielding of Motic2.0 image analysis software to press the image of sampling device, re-use software and simulate the packaging film border, use vertically long 478 pixels of Motic2.0 image measurement software measurement, laterally long 470 pixels, area 478 pixels * 470 pixels;
7, calculating vertical percent thermal shrinkage according to formula (1) is 6.3%, and calculating horizontal percent thermal shrinkage according to formula (2) is 6.0%, and calculating the overall thermal shrinkage factor according to formula (3) is 11.9%.
Embodiment 3
1, cigarette packaging film is cut into the square of length of side 50mm;
2, packaging film is placed under the pressure sampling device, keeps film smooth;
3, by gathering the cigarette packaging film image through the CCD imaging device of demarcating, use the image analysis function of MATLAB 8.0 to simulate the packaging film border, the image measurement functional measurement that uses MATLAB 8.0 is long 50.1mm vertically, horizontal long 50.0mm, area 2505mm
2
4, packaging film is placed in 120 ℃ the silicone oil, keeps 20 s;
5, from silicone oil, take out cigarette packaging film, be placed into after the cooling and press under the sampling device, keep smooth;
6, by the packaging film image after shrinking through the CCD imaging device collection of demarcating, image analysis function by MATLAB 8.0 simulates the packaging film border, the image measurement functional measurement that uses MATLAB 8.0 is long 47.8mm vertically, horizontal long 47.0mm, area 2247mm
2
7, calculating vertical percent thermal shrinkage according to formula (1) is 4.6%, and calculating horizontal percent thermal shrinkage according to formula (2) is 6.0%, and calculating the overall thermal shrinkage factor according to formula (3) is 10.3%.
Embodiment 4
1, cigarette packaging film is cut into the rectangle of length of side 50mm * 30mm;
2, packaging film is placed under the pressure sampling device, keeps film smooth;
3, gather the cigarette packaging film image by the CCD imaging device, the use image analysis software V4.7 of Daheng simulates the packaging film border, uses the image analysis software V4.7 of Daheng to measure vertically long 510 pixels, laterally grows 305 pixels, area 510 pixels * 305 pixels;
4, packaging film is placed on 120 ℃ the infrared hot plate, keeps 3 min;
5, take out cigarette packaging film from hot plate, be placed into after the cooling and press under the sampling device, keep smooth;
6, by the packaging film image after the CCD imaging device collection contraction, use the image analysis software V4.7 of Daheng to simulate the packaging film border, use the image analysis software V4.7 of Daheng to measure vertically long 460 pixels, laterally grow 275 pixels, area 460 pixels * 275 pixels;
7, calculating vertical percent thermal shrinkage according to formula (1) is 9.8%, and calculating horizontal percent thermal shrinkage according to formula (2) is 9.8%, and calculating the overall thermal shrinkage factor according to formula (3) is 18.7%.
Only be preferred implementation of the present invention below, should be pointed out that above-mentioned preferred implementation should not be considered as limitation of the present invention, protection scope of the present invention should be as the criterion with the determined scope of claim.For those skilled in the art, without departing from the spirit and scope of the present invention, can also make some improvements and modifications, these improvements and modifications also should be considered as protection scope of the present invention.
Claims (7)
1. cigarette packaging film percent thermal shrinkage measuring method, it is characterized in that: be the dimensional parameters that is captured in the heating medium cigarette packaging film before and after processing through uniform temperature and time by image collecting device, after image carried out pre-service, simulate the cigarette packaging film border of shrinking front and back by image analysis software, the change in size of use image measurement software measurement cigarette packaging film is through obtaining vertical, the horizontal and overall thermal shrinkage factor of cigarette packaging film after calculating.
2. cigarette packaging film percent thermal shrinkage measuring method according to claim 1, it is characterized in that: the concrete steps of described measuring method are as follows:
1) cigarette packaging film is cut into certain size, long 50mm～300mm, wide 50mm～300mm;
2) packaging film is placed under the pressure sampling device, smooth to guarantee film;
3) gather the cigarette packaging film image by image collecting device, simulate the packaging film border by image analysis software, use image measurement software measurement longitudinal length L
1, lateral length W
1, area S
1
4) packaging film is placed under 120 ℃ temperature, heats 20s～5 min in the heating medium;
5) from heating medium, take out cigarette packaging film, be placed into after the cooling and press under the sampling device, keep smooth;
6) by the packaging film image after the image collecting device collection contraction, simulate the packaging film border by image analysis software, use image measurement software measurement longitudinal length L
2, lateral length W
2, area S
2
7) calculate vertical percent thermal shrinkage T according to formula (1)
1, calculate horizontal percent thermal shrinkage T according to formula (2)
2, calculate overall thermal shrinkage factor T according to formula (3)
3:
?…………………………（1）
T
1Vertical percent thermal shrinkage;
L
1Longitudinal length before shrinking;
L
2Longitudinal length after shrinking;
T
2Horizontal percent thermal shrinkage;
W
1Lateral length before shrinking;
W
2Lateral length after shrinking;
T
3The overall thermal shrinkage factor;
S
1Area before shrinking;
S
2Area after shrinking.
3. cigarette packaging film percent thermal shrinkage measuring method according to claim 2 is characterized in that: the framework that the dark hard material of the color homogeneous that described pressure sampling device is a kind of groined type forms.
4. cigarette packaging film percent thermal shrinkage measuring method according to claim 1 and 2, it is characterized in that: said image collector is set to CCD imaging device or digital camera.
5. cigarette packaging film percent thermal shrinkage measuring method according to claim 1 and 2, it is characterized in that: described image analysis software comprises and can carry out process of fitting treatment to the out-of-flatness border of the image that obtains, makes its software that becomes a straight boundary or image analysis processing module.
6. cigarette packaging film percent thermal shrinkage measuring method according to claim 1 and 2 is characterized in that: described image measurement software comprises software or the image measurement module that can carry out size and area measurement to the sample image after processing.
7. cigarette packaging film percent thermal shrinkage measuring method according to claim 1 and 2 is characterized in that: described heating medium comprises the heating mediums such as air dry oven, hot plate, hot liquid that can carry out to sample the certain hour heating under design temperature.
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| CN2013102819639A CN103308548A (en) | 2013-07-06 | 2013-07-06 | Measuring method of thermal shrinkage rate of cigarette packaging film |
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| CN2013102819639A CN103308548A (en) | 2013-07-06 | 2013-07-06 | Measuring method of thermal shrinkage rate of cigarette packaging film |
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Cited By (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237298A (en) * | 2014-09-23 | 2014-12-24 | 海南中航特玻材料有限公司 | Method for testing shrinkage rate of electronic flat glass |
| CN106645270A (en) * | 2016-11-24 | 2017-05-10 | 深圳市星源材质科技股份有限公司 | Thermal contraction testing device of lithium-ion battery separator and application method |
| CN107228876A (en) * | 2017-06-26 | 2017-10-03 | 东旭科技集团有限公司 | A kind of method for evaluating glass substrate thermal contraction |
| CN108918579A (en) * | 2018-05-15 | 2018-11-30 | 中国科学院合肥物质科学研究院 | A kind of method for automatic measurement of film shrink rate |
| CN110568004A (en) * | 2019-10-14 | 2019-12-13 | 上海第二工业大学 | method for testing thermal shrinkage rate of battery diaphragm |
| CN111307853A (en) * | 2019-11-29 | 2020-06-19 | 宝燕工业科技(南通)有限公司 | Device for testing heat shrinkage property of biaxially oriented polypropylene film and use method thereof |
| CN111380901A (en) * | 2018-12-27 | 2020-07-07 | 贵州中烟工业有限责任公司 | Method, device and equipment for testing shrinkage rate of cigarette film and readable storage medium |
| CN112683942A (en) * | 2020-12-25 | 2021-04-20 | 东莞维科电池有限公司 | Diaphragm thermal shrinkage assessment method |
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| JP2004037276A (en) * | 2002-07-04 | 2004-02-05 | Kansai Paint Co Ltd | Method for diagnosing deterioration in coating film |
| CN102346157A (en) * | 2011-06-25 | 2012-02-08 | 潍坊恒联玻璃纸有限公司 | Method for measuring thermal shrinkage performance of glass paper |
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Patent Citations (4)
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| JPH06167468A (en) * | 1992-11-30 | 1994-06-14 | Nippon Steel Corp | Noncontact type measuring method for thermal expansion of refractory material |
| JP2004037276A (en) * | 2002-07-04 | 2004-02-05 | Kansai Paint Co Ltd | Method for diagnosing deterioration in coating film |
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Cited By (10)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104237298A (en) * | 2014-09-23 | 2014-12-24 | 海南中航特玻材料有限公司 | Method for testing shrinkage rate of electronic flat glass |
| CN106645270A (en) * | 2016-11-24 | 2017-05-10 | 深圳市星源材质科技股份有限公司 | Thermal contraction testing device of lithium-ion battery separator and application method |
| CN106645270B (en) * | 2016-11-24 | 2020-11-24 | 深圳市星源材质科技股份有限公司 | Lithium ion battery diaphragm thermal shrinkage testing device and using method |
| CN107228876A (en) * | 2017-06-26 | 2017-10-03 | 东旭科技集团有限公司 | A kind of method for evaluating glass substrate thermal contraction |
| CN108918579A (en) * | 2018-05-15 | 2018-11-30 | 中国科学院合肥物质科学研究院 | A kind of method for automatic measurement of film shrink rate |
| CN111380901A (en) * | 2018-12-27 | 2020-07-07 | 贵州中烟工业有限责任公司 | Method, device and equipment for testing shrinkage rate of cigarette film and readable storage medium |
| CN110568004A (en) * | 2019-10-14 | 2019-12-13 | 上海第二工业大学 | method for testing thermal shrinkage rate of battery diaphragm |
| CN111307853A (en) * | 2019-11-29 | 2020-06-19 | 宝燕工业科技(南通)有限公司 | Device for testing heat shrinkage property of biaxially oriented polypropylene film and use method thereof |
| CN111307853B (en) * | 2019-11-29 | 2022-08-19 | 宝燕工业科技(南通)有限公司 | Biaxial stretching polypropylene film heat shrinkage property testing device and using method thereof |
| CN112683942A (en) * | 2020-12-25 | 2021-04-20 | 东莞维科电池有限公司 | Diaphragm thermal shrinkage assessment method |
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Application publication date: 20130918 |