Most popular non absorbent materials such as ordin

2022-08-02
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With the development of society, people have an increasing demand for fine printing materials. The substrate materials for offset lithography have become more and more diversified from a single paper. Non absorbent materials such as PVC, PE, PP, pet, synthetic paper, gold and silver card are also increasing as substrate. UV offset printing technology, which has developed rapidly in recent years, caters to this demand to a great extent. However, with the increasingly strict requirements for the paper industry, UV offset printing also has certain limitations: the investment in machinery and equipment for UV offset printing is relatively high; High cost of ink and consumables; The requirements for production management, process technology, technicians and related supporting storage and production conditions are relatively high. Based on the principle of oxidation film drying, offset film inks complete the printing of non absorbent substrate materials such as plastic film, gold and silver cardboard on ordinary offset presses, which solves the problem that many printing enterprises without UV offset equipment cannot engage in the printing of substrate materials such as plastic film, gold and silver cardboard, provides great convenience for printing enterprises, and expands the scope of printing business

the characteristics of offset film inks are that the inks are dried by oxidation conjunctiva and do not need UV or IR on non absorbent substrates; The drying and fixing time of post printing surface is faster than that of general offset printing ink, and the printing pieces are not easy to stick; Good adhesion to substrate, bright colors; Compared with UV offset printing ink, the printing ink layer of film ink is relatively thin and fine

attention shall be paid to the following matters during the use of offset film ink: PVC, PE, PP, pet and other plastic films shall be corona treated before printing, meeting the printing requirements; The pH value of fountain solution should be controlled at about 6, not too acid, otherwise it will affect the drying of ink; The amount of alcohol added in the fountain solution can be appropriately increased, which can be controlled at about 15%. During printing production, the water supply of the printing plate should be reduced as much as possible. Excessive water supply of the printing plate will cause excessive ink emulsification, which will lead to slow drying or even non drying of the ink; To use dusting, each stack of printed sheets should not be too high to avoid sticking. The printed pieces should be placed in a relatively wet place? 3.2 the ferrographic analysis method has been significantly reduced below 60% to facilitate ink drying; Clean the ink bucket and roller immediately after printing to prevent the ink from drying and scaling on the roller

in addition to the basic four-color printing ink and the supporting white printing ink, Jinan assaying is a manufacturer focusing on the independent research, development, production and sales of quality testing equipment. There are a variety of spot colors to choose from. It has well realized the printing of non absorbable printing materials such as plastic film and gold and silver card with ordinary offset press. However, film inks also have some shortcomings, mainly as follows: the post printing ink has a long drying time on the non absorbent substrate, and it generally takes 5 to 6 hours or even longer for the ink to be completely dried. Before the ink is dried, the printed products are easy to be scratched and dirty, and it is easy to produce defective products in the production operation. In view of this situation, after painstaking research, people in the printing industry have successfully introduced a water-based varnish film water oil specially used for non absorbent substrate materials such as plastic film, which greatly facilitates the printing production operation and improves the production quality

according to the different coating methods, the film water oil can be divided into two types: the film water oil suitable for the line glazing machine and the film water oil suitable for the independent glazing machine. The water oil of on-line glazing film can be coated after ink printing on the printing machine with on-line glazing unit, and the printing and glazing can be completed at one time. After infrared drying, the film water oil reaches the initial dry state on the surface, and the ink and varnish on the surface of the printed sheet will not stick to the hand. In this way, powder spraying can be avoided to prevent scraping and sticking of the printed piece. Film water oil is different from ordinary paper water oil. It has air permeability after drying, which is conducive to the contact between ink and air, and does not affect the drying principle of film ink oxidation film. Film water oil can effectively improve the adhesion of film ink on the substrate, protect the printing ink layer from scratching and improve the resistance in all aspects. In addition, the film water oil can not only be fully coated on the on-line polishing machine, but also be partially coated with the on-line polishing resin plate, so that the printed matter can achieve a very beautiful effect. For some films with poor abrasion and scratch resistance on the substrate after the printing ink is dried, the independent polishing film water oil can enhance the abrasion and scratch resistance of the ink, achieve the effect of good adhesion, and it is easy to use. The ordinary infrared or hot air drying independent oiler can be used for coating

film ink is used in combination with film water and oil to print non absorbent materials such as plastic film on ordinary offset printing machines. Especially for printing machines with line glazing unit, it is an ideal choice for printing enterprises without UV offset printing equipment, and can also become a backup scheme for printing enterprises with UV printing equipment

reprinted from: Greater China Printing Art

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