There are many texts, few photos and pictures, many opportunities for text modification, and a small number of prints--prints between hundreds or thousands are suitable for letterpress printing. The number of type printing should not exceed 30,000, and the electronic version of fine pictures should not exceed 70 to 80,000. Printed pictures must use pink paper to get perfect dots. Therefore, you can't use cheap paper to print pictures and hope to achieve exquisite results. When using the letterpress layout form, the joints of the lines are easily separated and out of joint, which is a common disadvantage. In addition, too much pressure during printing or too soft the surface of the pressure cylinder will cause embossed protrusions on the back of the printed sheet of the finished product, which will greatly reduce the quality of the printed product.
The biggest difference between offset printing and letterpress printing is that letterpress printing screen images must be made of paper with a smooth surface. Offset printing does not have this need, as long as the paper quality is not too rough. The printing screen effect is softer than the letterpress, and it is easy to print round dots.
Resin plate or nylon plate is another printing plate that can withstand abrasion better than the above-mentioned several plates. The number of prints can reach one million, which can be said to be the longest life of the printing plate. However, the method of using this type of printing plate is slightly different from the ordinary offset printing method, that is, it does not require a wetting system, so it is named "dry offset printing".
Generally speaking, the more pictures there are in the printed matter, the larger the picture area, and the better it is to use offset printing instead of letterpress printing. As mentioned above, the effect of printing pictures with offset printing is better than that of letterpress printing. Therefore, general color printing and four-color printing use offset printing instead of letterpress printing.
Gravure printing is suitable for printing high-quality and expensive publications. Whether it is four-color or black and white pictures, gravure printing can be highly similar to photographic photos. Because the plate-making fee is expensive and the printing volume must be large, it is the least used of the five printing types in Hong Kong.
Because the screen printing ink is particularly thick, it is most suitable for printing with special effects. The quantity is not large and the ink needs to be thick. It can also be printed on three-dimensional, such as square boxes, boxes, round bottles, cans, etc. In addition to paper, the bottom can also be printed on cloth, plywood, plastic sheet, metal sheet, glass, etc. It is commonly used to print pennants, T-shirts, Watson boxes, soda bottles, circuit boards, etc. The above-mentioned various printing features are not available in other printing methods.
Reflective material printing can be widely used in: luggage, clothing, lighting, accessories, advertising and other fields.