Properties and post press processing characteristi

2022-08-09
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Performance and post press processing characteristics of translucent paper for printing

release date: Source: China paper industry

it is difficult to choose between non coated paper without wood pulp and coated paper with gloss. Not because there is not enough paper to choose from, but because the two kinds of paper are very similar in quality, special paper such as translucent paper is often ignored in this field. Translucent paper is widely used, and has been widely used in certificates, announcements, inserts, business cards, direct mail, invitations, menus, etc

performance of translucent paper

translucent paper is different from ordinary paper, and its printing effect is unique. It can make the printed graphic information clearer, the products more mysterious, and the appearance packaging more attractive. Translucent paper is usually harder and straighter than non coated paper without wood pulp. In the process of papermaking, translucent paper is easy to dry. It contains more fiber and few fillers, so it has good transparency. However, due to its unique way of papermaking and drying, its manufacturers are few, so the price is relatively expensive

printing suitability of translucent paper

for translucent paper, the main printing method is offset printing. The number of printing lines should be controlled within 133 ~ 150dpi, and the maximum should not exceed 200dpi. Like ordinary paper, the printing environment of translucent paper is best controlled at a relative humidity of 50% and a temperature of 24 ℃. If the translucent paper is pre placed in an environment without temperature and humidity control, when it is transported to the printing workshop, it should be placed in a pre adjusted temperature and humidity environment for 24h or longer. The translucent paper should be kept ventilated when it is not loaded. It should be wrapped in plastic bags during transportation and covered when not in use, so as to prevent the paper from being polluted or causing water loss

like plastic film, the drying method of the ink used for translucent paper printing is oxidative conjunctival drying, not osmotic drying, so it is best to choose quick drying ink. But we should avoid using high-temperature drying technology, such as infrared drying, because translucent paper is easier to curl than ordinary paper. Before the official printing, the test ink is usually used for proofing, and the drying time may be increased by one week with general ink. Using the background color removal technology can obtain more orders from enterprises and reduce the drying time

in order to prevent the extension of ink drying time or paper deformation, the ink in oil in water state should be controlled to the minimum as far as possible, or the wetting amount can be reduced by controlling the pH value of the fountain solution at 5 ~ 6, and the amount of ethanol can be increased to 13 ~ 15% to reduce the amount of water on the printing plate, but these methods should be strictly controlled to avoid changing the ink performance

when printing, in order to prevent the back of the translucent paper from rubbing dirty, it can be sprayed with a fineness of 15 ~ 20 μ M powder, after printing, a layer of UV varnish can be printed on it to increase the gloss of the print, but the use of water-based emulsion varnish should be avoided, and the printing can only be done after the ink is dry

when printing with translucent paper, the amount of paper loaded and received should be as small as possible. After printing, the printed matter should be sorted into small paper piles of light vehicles, electric vehicles, and even unmanned vehicles

post press processing of translucent paper

in the specific use process, the technology of translucent paper in folding, crease pressing and punching technology is not very mature. When folding, the translucent paper is easy to produce cracks, and it is difficult to get through when punching. The reason is that its high fiber content makes the paper harder and more brittle. Therefore, before printing, double-sided inspection and proofing should be carried out to avoid waste of paper

when cutting, use a 30 ° blunt knife, because the new knife may immediately crack the paper. When pressing creases and folds, it is required to use a pattern paper type system, because the hard indentation line will make the translucent paper crack when folding. In addition, the folding of sheet fed paper should be carried out along the fiber direction to reduce the possibility of cracks during folding

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