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You can look at the appearance to see if the kraft paper has any problems such as hair removal and powder removal. This is also a simple way to test high-quality kraft paper. You can also face the kraft paper to strong light and let the light penetrate the kraft paper. If there are no obvious black dot lines, etc. The problem shows that the weight of the kraft paper is very uniform, and it is generally up to the standard. At the same time, the surface layer can also be observed. The surface roughness of various kraft papers is different. When touching the kraft paper by hand, it should be compared with the sample, and pay attention to check whether the surface layer of the paper has needle-eye patterns and other undesirable phenomena. The quality of the kraft paper product can also be seen.
The heat transfer paper manufacturer of course said that they can also take out a few kraft papers and fold them a few times. If cracks appear after folding, it indicates that the kraft paper does not meet the standard, and vice versa. At the back, sampling can accurately measure the grammage of kraft paper but requires the use of test tools. Generally, the performance test of the heat transfer paper manufacturer can test the performance of the heat transfer paper manufacturer in terms of thickness, tightness, smoothness, and bursting resistance.
In paper production, the color difference of kraft paper has always been a problem.
Different batches of kraft paper have more or less color differences from the same type of kraft paper. Why can't kraft paper manufacturers produce color-stable kraft paper? What is the difficulty in solving the color difference of kraft paper?
Before understanding the color difference of kraft paper, we need to understand the production process of kraft paper: kraft paper is generally made of sulfuric acid needles and leaf wood pulp and made of pulp and fourdrinier paper machine. Generally speaking, there are brown, dark brown, light brown, and other colors. Temperature, humidity, moisture, kraft paper raw material needles, leaf pulp, etc. are all the colors of kraft paper.
One of the main factors affecting color difference is pulp, because large
Most kraft paper is the primary color, not bleached, and it is difficult for primary color wood pulp to achieve the same color, resulting in a color difference between different batches of kraft paper. The solution is to dye or bleach, but kraft paper is usually a primary color, which is a difficulty.
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