On holidays, people often use greeting cards to express their blessings. Greeting cards are generally made of paper, and the production process seems to be simple, but it is not, because it has a lot of places to pay attention to.
Paper selection
Generally speaking, there are three types of printed greeting cards: white cardboard, double copper cardboard, and special paper.
The greeting card made of white cardboard has a smooth surface and can print relatively delicate patterns. The greeting cards produced are quite straightforward. Among them, the price of yellow core white cardboard is relatively cheap, but it is easy to turn yellow when it is long, and it is generally used as a greeting card with strong seasonality, short cycle and high color requirements.
Both sides of the double copper cardboard are relatively smooth and flat, and all of them can be printed with relatively fine patterns. The greeting cards produced are slightly worse than the cards made by white cardboard. Since both sides are coated and calendered, it is not very suitable for the user to write.
Special papers are used in many greeting cards, and the performance of various special papers is not the same. The special papers of light yellow, white, red and other colors are commonly used in China. The printing performance of special paper is not very good, especially the red special paper, which is basically not printed, but directly processed, such as hot stamping, bumping, or UV printing on screen printing.
In the printing process, when the back of the greeting card made of cardboard is printed, special attention should be paid to it, because the back of the cardboard has strong ink absorption, such as poor ink drying, which tends to cause problems such as stickiness. In order to solve such problems, it is necessary to add a wear-resistant dry aid, or to apply a protective layer on the ink to prevent the card from being dirty, but it should be noted that the protective layer must be separated from the writing area, because once the writing area is printed with a protective layer, the used It will make the writing ink not dry, thus sticking to the greeting card.
The printing of greeting cards is mostly offset, and the ink should be bright and dry. If the surface of the greeting card requires a large amount of ink, the greeting card should be protected, such as dusting. Also note that if the amount of ink is large and the powder particles are large, the powder will make the surface of the greeting card white, rough and uneven, and the hand feel is very poor.
Some cards use special paper. After printing, the ink is difficult to dry. This is because the surface of the paper itself is rough. Some specialty paper manufacturers have reduced the manufacturing cost and did not control the pH of the paper surface, which affects the printing: the surface acidity is acidic. It will cause difficulty in drying the ink, and it will be easy to be sticky when printing; the surface acidity and alkalinity will cause post-processing difficulties, and once it is found, it has often caused a great loss.
In the case of a gold/silver card, it is best to use low-odor or odorless UV printing. If some greeting cards have environmental protection requirements, it is best not to use ink made from ordinary petroleum refining materials, but to use ink made from soybean oil or other vegetable oils.
Post processing
The post-processing technology of the greeting card includes die-cutting, hot-pressing, glazing, embossing, patching, etc., and some will be made into a three-dimensional greeting card. Pay attention to the following points when processing.
Die cutting
Pay attention to the adaptability of the material to post processing. For example, when cutting, pay attention to the direction of the silk of the paper. Some cards use thin and tight paper, so the die-cut blunt line should be perpendicular to the direction of the paper.
Some special papers need UV glazing. It is necessary to test the absorption of UV varnish by paper. If the absorption is too good, even if the varnish is absorbed by the paper twice, then the paper is not suitable for this process. .
Pressure bump
Greeting cards often need to do some complicated bumping process, which is very demanding on paper. If you want to make better results, the surface fiber strength of the paper itself will be high. Paper with better strength is Swedish white cardboard.
Hot stamping
Pay attention to the pH of the paper. If the paper is unqualified, the hot stamping will probably be removed within a few weeks after the hot stamping is completed, and it will become streaked. Also pay attention to the sequence of the various processes, such as paying attention to the UV varnish on the screen printing will not burn. If you have such a requirement, you need to first print on the greeting card and then print the UV varnish.
Glazing
Pay attention to the matching of various processes, such as the water-based glazing on the front of the greeting card and the adhesive tape on the back. It is not possible to use water-based glue or oil-based glue because the water in the water-based glue will penetrate to the front side, causing the water-based glazing to wrinkle and using the oil-based glue. Hot gels will need to be used as yellow and fragile over time.
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