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An Automatic Measurement Method of Film Thermal Shrinkage

A thermal shrinkage, automatic measurement technology, applied in the direction of measuring device, material thermal expansion coefficient, instrument, etc., can solve the problems of high labor intensity, large human interference, inaccurate measurement, etc., to reduce human measurement errors and overcome large human interference. , the effect of improving the measurement accuracy

Active Publication Date: 2021-03-02
HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The manual measurement method has the following main problems: (1) The operator uses a steel ruler to measure the length of the film, which has a lot of human interference and low measurement accuracy; (2) The measurement process is complicated to operate, and the thermal shrinkage rate of the film cannot be automatically calculated and recorded, which is inefficient and labor intensive
For example, in the patent CN 103308548 A "A Method for Measuring Thermal Shrinkage of Cigarette Packaging Film", the film is cut into long and thin strips, and then the thermal shrinkage of the film is measured by tension and length change, but this measurement method only It is suitable for measuring slender strip films, which has great limitations and cannot accurately reflect the longitudinal and transverse heat shrinkage of sheet films. match
In the patent CN 205593949U "A device for measuring the thermal shrinkage rate of a thin film using optical image technology", a method for measuring the thermal shrinkage rate of a film based on optical image technology is introduced, but the film will be wrinkled and twisted during the heating process, and the patent does not Membrane clamping or fixation methods without consideration of membrane wrinkling and twisting
In addition, the thin film image recognition method described in this patent cannot effectively identify the film boundary in a poor light environment. Line parallelism will directly cause inaccurate measurement

Method used

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  • An Automatic Measurement Method of Film Thermal Shrinkage
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Examples

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Effect test

Embodiment example 1

[0046] The appearance of the fixed platform of the film is dyed black or dark to increase the contrast between the boundary of the film and the fixed platform, so as to identify the boundary of the film more clearly and provide a guarantee for the accuracy of the measurement, such as figure 2 shown.

Embodiment example 2

[0048] The image of the thin film sample acquired by the industrial camera is processed as follows: figure 2 As shown, first divide it into 20 parts (the middle is equally divided), then measure the length value of each dividing line (the value is shown in Table 1 below), and then remove its outliers (such as removing the smallest 5 values ​​and the largest 5 values), and finally calculate the average value of the remaining data (shown in Table 2) after being eliminated, and obtain the final measured value (L2 vertical=90.16 and L2 horizontal=94.53), and use the film heat shrinkage calculation formula T=( L1-L2) / L1×100% to calculate the thermal shrinkage rate of the film (assuming L1 vertical=100 and L1 horizontal=100), T vertical=(100-90.16) / 100×100%=9.84%; T horizontal=(100 -94.53) / 100×100%=5.47%. This multi-group measurement can effectively eliminate outliers, avoid measurement errors, improve measurement accuracy, and can simultaneously measure the longitudinal and trans...

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Abstract

The invention relates to an automatic measuring method of film hot-shrinkage rate. The automatic measuring method of film hot-shrinkage rate comprises following steps: a thin film sample is fixed using a thin film fixing clamping device based on negative pressure absorption, an industrial camera is used for obtaining thin film sample images under light source system illumination ; an image processing analyzing system is adopted for pre-treatment of the thin film sample images to remove interference and noise in the thin film images; an image analysis system is used for identifying thin film sample image boundaries, measuring boundary length, and performing data optimization; the steps 1 to 3 are adopted for measuring of the thin film sample boundary length before baking and after baking. According to the automatic measuring method, negative absorption principles are adopted to solve thin film rapid fixing difficulty, computer vision technology is adopted to realize automatic measuringof thin film heating before and after length, calculate thin film hot-shrinkage rate rapidly and accurately, industrial standards are achieved, and measuring is accurate and reliable.

Description

technical field [0001] The invention relates to the technical field of film physical performance detection, and aims at a film measurement method proposed for the thermal shrinkage characteristics of the film, in particular to an automatic measurement method for the thermal shrinkage rate of the film. Background technique [0002] Film refers to a plastic material formed by a variety of polymer materials through co-extrusion, stretching and other processes. It has the advantages of high transparency and gloss, non-toxic materials, stable molecular structure, etc., and has the ability to isolate odor and moisture. Function. In view of this, films have been widely used in food packaging, cigarette packaging and other industries. Film thermal shrinkage refers to the rate of change of film size under certain temperature conditions and within a certain period of time. It is an important technical indicator of film characteristics. The thermal shrinkage characteristics of the fi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01N25/16G01B11/02
CPCG01B11/02G01N25/16
Inventor 刘勇张龙花昌义李志刚王澍吴晓松贾琳卢春
Owner HEFEI INSTITUTES OF PHYSICAL SCIENCE - CHINESE ACAD OF SCI
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