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First, letterpress printing <br> More text, fewer photographs and drawings, there are many opportunities for changing the text, the number of printed products is not large - hundreds or thousands of printed materials are suitable for printing in letterpress. The number of type printing should not exceed 30,000, and the fine picture electric version should not exceed 70,000. Printed paper must use powdered paper to get the perfect dot. So you can't use cheap paper to print your pictures and you want to get beautiful results. With the letterpress version of the letterpress form, the intersections of the lines are easily separated and disconnected, which is a common disadvantage. In addition, when the printing pressure is too high at the time of printing or the surface of the pressure cylinder is too soft, the back of the finished product sheet will have embossed relief, which will greatly reduce the quality of the printed matter.
Second, Offset Printing <br> Offset printing and letterpress printing the biggest difference is that the letterpress screen printing plate must use smooth surface paper, offset printing does not have this need, as long as the paper is not too rough. The screen printing effect is softer than the letterpress, and it is easy to print round dots.
The resin plate or nylon plate is another plate that is more wearable than the above plates. It can print up to one million times, which is the longest life in the plate. However, the method of using this kind of printing plate has been slightly different from the ordinary offset printing method, that is, without a wetting system, it is named "dry offset printing".
Generally speaking, the more pictures in prints, the larger the area of ​​the picture, the more appropriate to use offset printing instead of using letterpress printing. As described above, the effect of printing pictures using offset printing is better than that of typography. In general color printing, four-color printing uses offset printing instead of letterpress printing.
Third, gravure printing <br> gravure printing for printing high quality and valuable publications, whether it is four-color or black and white pictures, gravure printing can be highly similar to photographic photos. As the plate-making fee is expensive and the quantity of printing must be large, Hong Kong is the least used of the five types of printing.
Fourth, screen printing <br> As silk screen printing ink is particularly thick, the most suitable for special effects of the print, the number is small and the ink needs to be particularly strong. It can also be used in the three-dimensional printing such as square boxes, boxes, round bottles, cans and so on. In addition to paper, printing can also be printed, fast, plywood, plastic sheet, metal sheet, glass, etc., is commonly used to print silk flags, T-shirts, tile boxes, soda bottles, circuit boards and so on. The above-mentioned various printing characteristics are all other printing methods cannot.
Fifth, adhesive tape printing (rubber printing)
Adhesive printing is only suitable for printing plastic bags, hand pumping, and size plastic packaging. The input printer for the printed sheets is not a single sheet but a roll, which is cut one by one after printing. The fineness of printed dots and lines is far lower than that of letterpress and offset printing. It can be seen that offset printing cannot be used to print book publications.
Because the five kinds of printing methods are different, they must be matched with the appropriate printing methods according to the needs of the printed matter, so that the printed products can receive the expected results.