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Measuring method of thermal shrinkage rate of cigarette packaging film

A technology of thermal shrinkage rate and measurement method, applied in the direction of material thermal expansion coefficient, etc., can solve the problems that the center size cannot represent the overall size, affect the thermal shrinkage rate test results, and affect the film shrinkage degree, etc., to achieve fast testing speed and improve accuracy. performance and measurement accuracy, the effect of eliminating human error

Inactive Publication Date: 2013-09-18
CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Both methods have certain problems. The former uses a steel ruler to measure the vertical and horizontal dimensions before and after shrinkage. Since the shrinkage of the film is different in each direction, the central dimension cannot represent the overall size, so there are test differences.
The latter will affect the degree of shrinkage of the film due to the external force applied to the film, thereby affecting the test results of thermal shrinkage rate

Method used

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  • Measuring method of thermal shrinkage rate of cigarette packaging film
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  • Measuring method of thermal shrinkage rate of cigarette packaging film

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] 1. Cut the cigarette packaging film into a square with a side length of 50mm;

[0044] 2. Put the packaging film under the sample pressing device to keep the film flat;

[0045] 3. Collect the cigarette packaging film image through the calibrated CCD imaging device, use the Motic2.0 image analysis software to fit the packaging film boundary, and use the Motic2.0 image measurement software to measure the vertical length of 50.1mm, the horizontal length of 50.0mm, and the area of ​​2505mm 2 ;

[0046] 4. Place the packaging film in a blast drying oven and heat it at 120°C for 5 minutes;

[0047] 5. Take out the packaging film for cigarettes from the blast drying oven, place it under the sample pressing device after cooling, and keep it flat;

[0048] 6. Use the calibrated CCD imaging device to collect the image of the shrinking packaging film, use the Motic2.0 image analysis software to fit the packaging film boundary, and use the Motic2.0 image measurement software to ...

Embodiment 2

[0051] 1. Cut the cigarette packaging film into a square with a side length of 50 mm;

[0052] 2. Put the packaging film under the sample pressing device to keep the film flat;

[0053] 3. Collect the image of cigarette packaging film with a digital camera, use Motic2.0 image analysis software to shield the image of the sample pressing device, and then use the software to fit the boundary of the packaging film, and use Motic2.0 image measurement software to measure the vertical length of 510 pixels and the horizontal length 500 pixels long, 510 pixels x 500 pixels in area;

[0054] 4. Place the packaging film in a blast drying oven and heat it at 120°C for 5 minutes;

[0055] 5. Take out the packaging film for cigarettes from the blast drying oven, place it under the sample pressing device after cooling, and keep it flat;

[0056]6. Use a digital camera to collect the image of the shrinked packaging film, use Motic2.0 image analysis software to shield the image of the sample...

Embodiment 3

[0059] 1. Cut the cigarette packaging film into a square with a side length of 50 mm;

[0060] 2. Put the packaging film under the sample pressing device to keep the film flat;

[0061] 3. Collect the image of cigarette packaging film through the calibrated CCD imaging device, use the image analysis function of MATLAB 8.0 to fit the boundary of the packaging film, and use the image measurement function of MATLAB 8.0 to measure the vertical length of 50.1mm, the horizontal length of 50.0mm, and the area of ​​2505mm 2 ;

[0062] 4. Place the packaging film in silicone oil at 120°C for 20 s;

[0063] 5. Take out the packaging film for cigarettes from the silicone oil, place it under the sample pressing device after cooling, and keep it flat;

[0064] 6. Use the calibrated CCD imaging device to collect the image of the shrinking packaging film, use the image analysis function of MATLAB 8.0 to fit the boundary of the packaging film, and use the image measurement function of MATLA...

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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 [0001] The invention relates to the technical field of plastic film testing, in particular to a method for measuring the heat shrinkage rate of packaging films for cigarettes based on machine vision technology. Background technique [0002] Cigarette packaging film, also known as "biaxially oriented polypropylene film", referred to as cigarette film, is co-extruded and stretched from a variety of polypropylene functional materials. It has high transparency and gloss, and the material is non-toxic and has a stable molecular structure. A packaging material that has a certain barrier function to odor and moisture. Cigarette packaging film is generally divided into two types: ordinary film and shrinkable film. Shrinkable film has good high-speed running performance, good optical performance and excellent heat sealing performance, and has a high shrinkage rate to ensure that the packaging has a good adhesion effect. Heat shrinkage rate is an important technical ...

Claims

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Application Information

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IPC IPC(8): G01N25/16
Inventor 董浩周明珠刘锋王锦平周德成荆熠李晓辉邢军
Owner CHINA NAT TOBACCO QUALITY SUPERVISION & TEST CENT
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