Method for evaluating fold-crack resistance of coated paperboard

A coated cardboard, anti-folding technology, applied in the direction of using a stable bending force to test the strength of materials, measuring devices, and material analysis through optical means, can solve the problems of inability to achieve quantitative evaluation and large human errors

Inactive Publication Date: 2017-05-03
CHINA NAT PULP & PAPER RES INST CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The phenomenon of folding cracking is complicated. To solve the problem of folding cracking is facing a fundamental problem, that is, how to qualitatively evaluate t

Method used

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  • Method for evaluating fold-crack resistance of coated paperboard
  • Method for evaluating fold-crack resistance of coated paperboard

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Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0019] Select base paper weight 250g / m 2 , the coating weight is 45g / m 2 coated whiteboard. Folding along the transverse direction of the cardboard, the cardboard coating is first stretched and then compressed. The tension in the plane of the cardboard is 0.75kg during folding. Scan the crease of the folded coated white cardboard, the scanning resolution is 4800dip, and the scanned image is an 8-bit grayscale image, see the attached figure 1 . Using the ImageJ image processing software, the 8-bit grayscale image was binarized, and the background and edges were removed. The processed binary image is shown in the appendix. figure 2 . Use the Analyze Particles command of ImageJ image processing software to attach figure 2 The image of the image is analyzed, and the analysis result of Summarize gives the proportion of the coating crack area (Area Fraction), which is 5.4%.

Embodiment approach 2

[0021] Select base paper weight 200g / m 2 , coating amount is 25g / m 2 coated white cardboard. Folding along the transverse direction of the cardboard, the cardboard coating is first stretched and then compressed. The tension in the plane of the cardboard is 0.75kg during folding. Scan the crease of the folded coated white cardboard with a scanning resolution of 4800dip, and the scanned image is an 8-bit grayscale image. Using ImageJ image processing software, the 8-bit grayscale image was binarized and the background and edges were removed. The image was analyzed using the Analyze Particles command of the ImageJ image processing software, and the analysis result of Summarize gave the ratio of the coating crack area (Area Fraction), which was 2.9%.

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Abstract

The invention discloses a method for evaluating the fold-crack resistance of a coated paperboard. The method is characterized in that a horizontal fold-resistant instrument is used for folding the paperboard; since coated paperboards with poor fold-crack resistance present cracks with areas of different sizes at folds after folding, a scanner is used for scanning the folded paperboard on the basis of color contrast between a coating and fiber; image processing software Image J is employed for processing of an obtained image; the processed image is analyzed so as to obtain the proportion of the fold-crack area of the paperboard; and the fold-crack resistance of the paperboard is evaluated on the basis of the proportion, wherein the greater the proportion of the area is, the severer cracking damage is and the poorer the fold-crack resistance of the coated paperboard is.

Description

technical field [0001] The present invention relates to an evaluation method. Specifically, it is a test method for evaluating the folding cracking resistance of coated paperboard. Background technique [0002] Coated paperboard is an important form of paper packaging. In recent years, with the development of economy, coated paperboard packaging not only pays attention to the packaging itself, but also pays attention to the printing decoration effect. Good printing effect can not only improve the grade of items, but also enhance customers' desire to buy. [0003] Coated paperboard is die-cut and crimped to form sheets in various carton formats. The carton is formed by folding at the crimp line before filling with items. At the opening of the carton, in order to facilitate the loading of items, it needs to be folded front and back at a large angle. During the above-mentioned folding process, the cardboard needs to undergo a relatively large deformation. At this time, the ...

Claims

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Application Information

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IPC IPC(8): G01N3/20G01N21/84
Inventor 王比松李洪才刘金刚
Owner CHINA NAT PULP & PAPER RES INST CO LTD
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