How to reasonably design the printing layout for special paper? The answer is that the printing layout should be reasonably designed based on the characteristics of gold and silver card paper and laser paper (including laminated paper and transfer paper).
The surface brightness of gold and silver card paper and laser paper is high, and their reflectivity is relatively strong. Therefore, when designing the layout, according to the characteristics of the materials, it is necessary to pay attention to highlighting the unique metallic luster of gold and silver card paper and laser paper that cannot be displayed by spectral colors, and appropriately expose the metallic hue on the surface to express the artistic beauty of the packaging.
When designing gold and silver card paper and laser paper packaging that combines solid ground, lines, text and images, it is necessary to avoid using overly small bold characters and thin negative lines to prevent plate blurring that may affect the printing quality of the product. When printing lines, text or small transparent or bright-colored pages on the surface of gold and silver card paper or laser paper, designs with poor contrast and color saturation should be avoided as much as possible. Text, lines, borders and logos should preferably be overprinted on the background color and designed in a dark color to achieve a striking effect.
Due to the high brightness of the surfaces of gold and silver card paper and laser paper, even slight misregistration can be easily detected by the naked eye. Therefore, it is advisable to avoid precise overprinting of multi-color plates as much as possible. For the layout with precise overprinting, it is advisable to consider expanding the edge of the light-colored overprinted layout by approximately 0.2mm to prevent obvious white exposure due to overprinting errors.
In addition, for embossed gold and silver card paper and laser paper, it is advisable to avoid printing small dots as much as possible to prevent affecting the faithful presentation of the fine layers of the layout and the easy occurrence of plate blurring.
The printing process adopts "deep ink thin printing or double printing"
The surfaces of gold and silver card paper and laser paper are non-absorbent. After the ink is printed on them, it only dries through oxidation and polymerization. This type of dry ink, once the ink layer becomes thick, is not easy to achieve complete drying both inside and outside the ink layer. This not only affects normal overprinting but also easily leads to the occurrence of smudging quality problems. To prevent this problem from occurring, when printing special color inks, it is advisable to appropriately darken the hue of the ink to make the printing ink layer thinner. In this way, it can not only meet the requirements of the original printing hue but also facilitate the rapid completion of overprinting and better prevent the printed matter from getting dirty.
For solid full-page printing on gold and silver card paper and laser paper, the "secondary printing" method can also be adopted. First, thin print the ink once, and then superprint once. This is conducive to the rapid drying of the ink layer and can better prevent the printed matter from getting dirty.
Process technology control for anti-sticking of printed materials
After printing on gold and silver card paper and laser paper, the ink layer is suspended on the surface film and will not dry quickly. If the process is not well controlled, it is easy for the product to get dirty and sticky, which will affect the printing quality of the product.
The key points of anti-sticking control in printing include: using high-quality powder with fine and uniform particles to spray powder on semi-finished printing products for anti-sticking. Avoid using high speed for printing. The machine speed for printing gold and silver card paper and laser paper packaging should be controlled within the range of 3,000 to 5,000 sheets per hour. Semi-finished products printed online by the printing machine should be stacked separately on shelves, and the stacking height of semi-finished products on each layer of shelves should not exceed 5cm. When the ink layer of the printed matter is semi-dry, the paper stack of the printed matter can be loosened and turned over to allow oxygen to enter the paper stack of the printed matter, promoting the oxidation and drying of the ink layer of the printed matter. During the printing process, the relative balance between the ink and the dampening solution should be maintained with the smallest possible amount of dampening solution. Through the control of these technological processes, the staining of printed materials can be effectively prevented.
The correct selection of ink varieties
Gold and silver card paper and laser paper are non-absorbent substrates. The type of printing ink used for them should also match their characteristics to achieve normal printing and printing quality.
Due to the differences in color, fineness, content, dispersion and binder used among various oxidized film-forming drying inks, the hue, concentration, viscosity, vividness, adhesion and drying properties of the inks also vary. Therefore, when printing gold and silver card paper and laser paper packaging, a comprehensive consideration should be given based on the characteristics of the product, the features of the printing machine and the printing environment. Only by choosing the appropriate type of ink for printing can the stability of product printing quality be guaranteed. Therefore, when purchasing printing ink for gold and silver card paper and laser paper, one should choose a manufacturer with a certain production scale. The quality of such inks is relatively stable and reliable. It is best to confirm the use of ink from one manufacturer. Our company has specially developed a special ink for laser paper based on the characteristics of gold and silver card paper and laser paper, which has excellent printing adaptability. It features fast drying, bright colors and good printability.
