Paper and ink performance testing method
We are a big printing company in Shenzhen China . We offer all book publications, hardcover book printing, papercover book printing, hardcover notebook, sprial book printing, saddle stiching book printing, booklet printing,packaging box, calendars, all kinds of PVC, product brochures, notes, Children's book, stickers, all kinds of special paper color printing products, game cardand so on.
For more information please visit
http://www.joyful-printing.com. ENG only
http://www.joyful-printing.net
http://www.joyful-printing.org
email: info@joyful-printing.net
(1) Thickness: In order to maintain the correct printing pressure on the printing machine, a diameter gauge is used. The thickness of the paper should also be measured with a micrometer. Generally, ten sheets are used to measure five points.
(2) Opacity: The opacity visual scale is an effective measurement tool. A set of characters is printed on the background of the gradually darkening dot, and the paper to be tested is placed on it, and the character is not visible at some point on the scale, which indicates the opacity of the paper.
(3) Absorptive: K&N inks are probably the most common and cheapest test methods. The ink is composed of a gray dye and an oil base, which is applied to a paper sample and rubbed off after two minutes. The density of the paper is the absorbency of the paper.
(4) Gloss: measured by the gloss meter in the direction of the paper, and averaged.
(5) Paper efficiency: This test combines the gloss and absorbency of the paper to measure the effect of the substrate on the color of the ink film. Non-absorbent paper with 100% gloss can print the most saturated colors. In contrast, 100% absorbent but matte paper (such as newspapers) will print very poor colors.
(6) Color and lightness: The approximate characteristics of paper color and lightness can be obtained by measuring the density of red, green and blue color filters after being scaled by a reflection densitometer. For ideal paper, the density under each color filter should be the same, and the density value is low, indicating high brightness. The visual comparison of the paper specimens makes more sense for the detection of the color and brightness of the paper.
(7) Uncovering the skin: Denison wax stick peeling test, despite its shortcomings, is still a suitable method for determining the anti-skinning ability of a particular substrate. The end of a certain level of wax rod is melted and pressed against the substrate to be tested, and after 15 minutes, it is quickly pulled up, and the removed fiber or paint is inspected on the end surface.
As with many other raw materials, the relative significance of wax stick testing is greater than predictive. That is to say, if the peeling does not occur, then the paper whose anti-uncrosion strength is higher than 10 will not be peeled off under the same conditions.