In addition to the characteristics of colorless, odorless, strong gloss, fast drying, and chemical resistance, the ideal glazing oil must also have the following properties:
â‘ The film has high transparency and does not change color. In order to obtain satisfactory results for the printed products after glazing, it is required that the dried film layer can not only show the gloss of the original printed graphics and texts, but also form a film layer with high transparency on the surface of the printed product. The film has high transparency and stable performance, and cannot be discolored or yellowed due to sun exposure or long use time.
â‘¡The film has certain toughness and wear resistance. Most glazed prints require a certain toughness of the surface film layer. For example, the protective cover and cover in the book binding require good flexibility of the surface film layer, so that it will not be damaged or cracked due to folding during use. The glaze coating must also have a certain wear resistance to suit the use conditions of the glazed products and the technological requirements of post-process processing. For example, the post-process processing of the covers of various packaging cartons and various books and periodicals is generally completed by machinery, and the product surface is inevitably subject to friction during the entire process. Therefore, the glazing film layer must have wear resistance.
â‘¢ Has a certain degree of flexibility. The bright film formed by any kind of varnish on the surface of the printed matter must maintain good elasticity in order to be compatible with the flexibility of the paper or cardboard, so as not to break, dry or fall off.
â‘£The membrane layer has better environmental resistance. Some of the printed products after glazing are used to make various packaging cartons. In order to play a good role in protecting the packaged products, the glazing film layer must have good environmental resistance. For example, the packaging of food, cigarettes, cosmetics, clothing and other commodities must have moisture and mildew resistance. In addition, the chemical properties of the dried film should be stable, and the performance cannot be changed by contact with chemical substances such as weak acids or alkalis in the environment.
⑤It has a certain adhesion to the surface of the printed matter. Due to the influence of the integrated density value of the surface graphic ink layer on the printed product, the surface adhesion is greatly reduced. In order to prevent the film layer from drying out and cracking in use after drying, the film layer is required to have strong adhesion and various types of ink and ink adjustment. The accessories have a certain adhesion.
â‘¥Good leveling and smooth film surface. There are many kinds of printing materials, and the influence of printed graphics and texts, the surface absorption, smoothness, wettability, etc. are very different. In order to make smooth coatings on different product surfaces can form a smooth film, the leveling of the coating is required. Good performance, smooth film surface after film formation.
⑦ Wide adaptability after printing. After the printed product is polished, it generally needs to undergo post-process processing, such as molding processing, hot stamping anodized aluminum processing, etc. Therefore, it is required that the glaze film layer has a wide adaptability after printing. For example: better heat resistance, after hot stamping of anodized aluminum, there can be no sticking phenomenon; high solvent resistance, after drying, the film layer cannot be blistered, wrinkled and sticky due to the influence of the adhesive in the post-processing phenomenon.
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