(1) Various types of printed articles
Ordinary printing usually stops flat printing on paper. Packing materials include not only paper and cardboard, but also corrugated paper, plastic, metal, glass, ceramics and various composite materials. Packaging containers are becoming more and more diversified in appearance, including flat, curved and irregular surface. Therefore, there are thousands of printed materials and forms of packaging and printing products.
(2) Diversification of printing methods
In addition to conventional offset printing, gravure printing, flexographic printing and screen printing, special printing technologies such as plane printing, laser holographic printing, liquid crystal printing and combination printing are often used in packaging printing in order to increase some special decoration or functional effects.
(3) Sensitive consumption patterns
According to the requirements of the products, the consumption mode of packaging printing presents distinct characteristics, such as many kinds, specifications and quality levels, and the number of printing varies from tens to millions.
(4) Pre-press and post-press processing is complicated.
Packaging, printing and printing materials are diversified. Paper packaging and printing often require polishing, film planting, die-cutting and other processing. In plastic packaging and printing, in order to increase the adhesion of ink on the plastic surface and eliminate static electricity, it is usually necessary to stop the pre-printing treatment of plastics by corona before printing. In metal packaging and printing, coatings and white ink are needed before printing and after printing. Stamping into cans and other operations.
(5) Packaging and printing products need to meet packaging suitability
In order to satisfy a series of requirements in the packaging process of filling contents and the packaging application process, packaging and printing products must have some characteristics, such as packaging filling resistance, friction resistance, content physical properties, water resistance, light resistance, odorless and attractive.
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