Process Extension and Characteristic Analysis of Transfer Paper Printing
The rapid drying characteristics of the Transfer Paper bring a lot of landmark changes in the printing industry, both in offset printing, gravure, embossing and silk screen printing and other fields, due to the mature use of UV technology, making multi-process combination of printing and three-dimensional The rapid growth of printing technology and market prospects makes it possible to use a group of machines and equipment to print on a single print using a variety of printing technologies. The goal of maximizing the visual effects of prints and minimizing production costs will be easier to achieve.
Transfer Paper market price is higher than ordinary Transfer Paper, the printing cost is also larger than ordinary printing paper printing, therefore, in the design and production of the early, should do the relevant budget. Secondly, in the development of post-processing technology, should take full account of the specificity of Transfer Paper on the implementation of other technology impact. The market is usually referred to as "over UV", "UV" mainly refers to the colorless transparent Transfer Paper, the use of screen printing. In fact, there are many types of Transfer Paper, there are different colors, which is a high environmental performance of the Transfer Paper, because the Transfer Paper does not contain volatile ingredients, such as solvents or water, it makes the print easy to maintain long And will not change color. After drying the Transfer Paper has a high surface wear resistance, color stability, high quality, fresh color, clear image and so on.
The composition of the Transfer Paper
The coloring composition includes organic pigments, inorganic pigments and filler pigments, which are important for the wettability of the connecting material.
The composition that determines the nature of the Transfer Paper is the binder. It plays the role of the pigment attached to the substrate, the Transfer Paper morphology and physical properties have a great impact. The connecting material consists of a neutral resin, an active oligomer and a diluted monomer.
Photopolymerization initiator and sensitizer, is the photopolymerization of the "initiator." Now the Transfer Paper to free radical polymerization as the mainstream way.
Pigments, linkers, photoinitiators and additives (see Table 1) to form the Transfer Paper.
By heating the solvent or water in the Transfer Paper to evaporate and dry the way. The solvent Transfer Paper is disadvantageous to the environment due to VOC. In order to make the water-based solvent or high-boiling solvent Transfer Paper drying must be equipped with a large oven, the corresponding energy consumption is also great. The ink film after drying in this manner is that the solid component in the Transfer Paper is adhered to the substrate, and the strength of the ink film is the strength of the material itself.
The solvent and the low viscosity component of the Transfer Paper penetrate into the printing material, and the solid content such as the resin and the pigment adheres to the drying surface of the substrate. The Transfer Paper in this way can be used for paper-like porous absorbent materials, but can not be used for non-permeable materials such as plastics. The infiltration drying method is used as a newspaper printing and drying method, drying time is short and no drying equipment is required. When printing is carried out using such Transfer Paper, the Transfer Paper is printed on the substrate and dried.
Oxidative polymerization using a combination of linoleum oil and soybean oil with a double bond, with oxygen in the air to produce oxidative polymerization reaction and drying. As with the infiltration drying method, although the drying does not require equipment and energy consumption, but requires a certain drying time, can not immediately enter the next process. In addition, in order to prevent the back of the sticky dirt and dust, the operation will bring environmental problems.
The Transfer Paper contains the active material and is cured by irradiation with ultraviolet rays or electron beams. Due to solvent and other VOC components, the impact on the environment is small, can also be used for plastic and other organic solvents susceptible to the impact of the printing material. Because it is instantaneous curing, printing can be immediately transferred to the next process. Since it is not cured by UV irradiation, it does not adhere to the printing press.