First, the impact of the printing process 1. Printing ink layer thickness. The paper used in the box is 250g/m2 imported white cardboard, which has high smoothness, low permeability, and a large area on the blue version. To achieve a uniform and full ink layer, the ink layer should be as thin as possible, and the ink layer should be too thick and dirty. In addition, because the permeability of the paper is small, the ink is liable to accumulate on the paper and the adhesion force is reduced. Accordingly, the wear resistance of the UV ink is reduced accordingly. Therefore, the thickness of the ink layer must be strictly controlled during printing.
2. The nature of the ink itself. It is required to use inks with fine pigment particles and excellent properties. If the pigment particles of the ink are coarse (such as gold ink) or the ink diluted with white ink, the binder material penetrates into the gaps of the paper fibers, and the pigment particles accumulate on the surface of the paper, resulting in powdering, and the rubbing is immediately lost. UV oil.
3. Add a variety of accessories in the ink. Such as adding anti-sticking agent, varnish or other additives, etc., after adding the nature of the ink has changed, thus affecting the printing Lu surface and UV oil adhesion. To add accessories for this purpose, be cautious and add the appropriate amount.
4. Dryness of the ink. If the ink is dried too fast and crystallizes, it will inevitably reduce the adhesion between the printed surface and the UV oil. If the drying is too slow, it will also affect the drying of the UV oil. These will affect the wear resistance of UV oil after drying. In addition, the acidity and alkalinity of paper also affect it. Therefore, the ink should be selected for proper drying time.
The compatibility of some inks and UV oils is not good. After printing, a layer of primer can be applied on the surface of the prints. The base oil should be uniform and the thickness should be moderate.
1. Thickness of UV coating. The photo-initiator is initiated after the coating has been exposed to ultraviolet radiation, generating free radicals or ions that cross-link with the double bonds in the prepolymer or unsaturated monomer to form the monomeric gene. This monomeric gene initiates a chain reaction to form a polymer solid polymer and completes the drying process of the coating coating. The overcoating layer is too thick, and the drying time is relatively long under the irradiation of the same power source. On the one hand, it affects the drying of UV oil, on the other hand, the water content of the paper is relatively reduced, and the paper becomes brittle and easily broken, all affecting the UV oil layer. Abrasion resistance.
2. The proportion of thinner and the power of the light source. The proportion of diluent in the UV oil is generally controlled within 50%. Too much is not conducive to drying, and the power of the light source is also required to be stable.
3.UV oil quality. The lifetime of UV oil is generally 6 months. If the viscosity of expired UV oil or UV oil is too large or too small, it will affect the characteristics of UV coating without discoloration and wear.
In addition, the temperature and humidity of the environment must also be controlled at constant temperature and humidity.
Third, the impact of die-cutting After the UV oil on the paper product should be completely dry before die-cutting. For a paper with a basis weight of 250 g/m2, a steel wire with a cutting line height of 23.80 mm shall be used. The height of the indentation line shall be 23.24 mm, and the thickness of the pad shall be 0.30-0.33 mm. The oversized paper may easily break the indentation line. . The width of the dark line breaks the indentation line.
In practice, we have found that dark inks such as black and dark blue are often not easily rubbed off when exposed to UV oil. Therefore, when designing a box-shaped pattern, UV oils should be avoided when they are dark. Use light colors instead. Or screening. Of course, there are many factors that affect the wear resistance of Paper Products after UV oil, such as the use of different manufacturers of ink, the use of the same printing process, the effect will be different, should be based on the actual situation of flexible control. (Hainan Zhicheng Color Printing Co., Ltd. Huang Haihua) ("Packaging and related industry information")
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Triple C International (ShenZhen) Co.,Ltd. was established in 2018. It`s a professional foreign trade company engaged in import and export trade, and carries out business operations such as international trade, cooperative production and intermediary trade. The company mainly provides high-quality OEM-product and ODM-product services for customs in Japan, Southeast Asia, Europe and Unite States, and has a professional technical team that provides hundreds of OEM-product services for dozens of customers, and has dozens of excellent suppliers. The company mainly provides sewing products, plastic products, paper products, wooden products, household products and other OEM services, including handbags, gift boxes,
Storage Boxes, stationery boxes, kid toys,
Paper Boxes, school supplies, office supplies and other products import and export business.
