A preview of the hottest in mold label printing pr

2022-10-03
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A glimpse of the printing process of in mold labels

in mold labels generally use plastic film substrate, which is printed in a traditional way. The surface is coated with a layer of UV or EB curing varnish for protection, and the back of the label is coated with solid chemical adhesive. In mold label materials are suitable for a variety of printing processing methods and different inks, including silk printing, UV relief printing, flexographic printing, gravure printing and offset lithography. Before selecting the ink, the adhesion, scratch resistance, chemical resistance and other properties of the ink on the label material in the mold should be tested according to the requirements of the final application. There are two printing and processing methods for in mold labels. 1. Web printing and processing: it is divided into online one-time processing and extension multiple processing. If the labels with bronzing patterns are printed and processed, and the printing machine is equipped with circular pressing, bronzing and die cutting devices, the processed labels can be formed at one time; Separate stamping machine and die-cutting machine, labels need to be processed many times. It is characterized by fast production speed, high efficiency and high roll making cost, which is suitable for mass production. 2. Sheet fed printing processing: usually silk screen printing and flat offset printing. In this way, multiple processes are completed on multiple equipment. The printing process is related to process design. The processing is more flexible, and the plate making cost is lower than that of the drum method, which is suitable for small batch production; The printing effect is good. The effect of silk screen printing and offset printing is better than that of web printing

offset printing process 1. offset printing characteristics a. the printing quality of small dots is superior to other printing methods, B. the line, field printing effect and color saturation are inferior to other printing methods, C. the control difficulty of color difference is greater than other printing methods, D. for short edition business, the production cost of offset printing is lower than other printing methods, e. it has the advantages of flexible production and rich printing levels, and is suitable for small batch, multi variety In mold labels with high printing quality requirements are more suitable for the current situation of label printing market in China. 2. Offset printing process a. the amount of powder spraying is moderate, and the accumulation of prints should not be too high. B. after printing, it should be fully aged to dry the ink. After printing, it needs to be coated with varnish to ensure the quality of prints. C. in printing, due to the poor hygroscopicity of the substrate, the amount of fountain solution should be reduced by 10% - 15% compared with the printing paper products (whichever is not dry). In the first step, try to use 10 years to 2025. Many fountain solutions will lead to pseudo drying and ink emulsification in printing. The pH value of fountain solution is controlled between 6 and 6.5. 3. Offset printing equipment: most domestic printing enterprises use Heidelberg sheet fed offset press series

flexographic printing technology. Flexographic printing is the mainstream packaging and label printing method in Europe and America, but domestic flexographic plate making and knife mold and other related supporting facilities are imperfect, and the market share is small. However, flexographic printing has developed rapidly in recent years and is an important development direction of label printing. 1. Flexographic printing features A. with the CDI plate making technology of computer direct plate making, it can obtain good thermal stability and heat resistance, high point quality and saturated printing color, B. It has the advantages of one-time forming and multi process combination that cannot be compared with other printing methods, C. UV ink printing is applied to make the printing color more gorgeous, dry faster, and have high one-time forming efficiency, which is suitable for medium and large-scale production, D. poor ink adhesion and poor gradual change effect, Generally, Polish after UV printing. 2. Foreign models of flexographic printing equipment are mainly Gerais and mcandi; Domestic models are mainly Shanghai Ziguang

gravure printing process: the number of gravure printing products in North America is absolutely dominant. 1. Gravure printing characteristics a. the printing effect and color saturation in the field should be superior to that of Star High Tech: this model can be used for sliding friction testing machine, rotating friction testing machine, rotating sliding composite friction testing, intermittent contact friction testing, and reciprocating friction testing. In offset printing, the ink is thicker, and the color of the print is transitional and natural, but the text expressiveness is not as good as that of offset printing. B. It is superior to offset printing and embossing in color difference control. C. The paper path is the longest, It is easier to generate static electricity than other printing methods. D. the plate making time is long and the cost is high, which is not suitable for the medium and short version label printing business. E. the ink layer is thick and the scratch resistance is the best, and the printing speed is fast, which is especially suitable for printing large quantities of long version live parts. F. continuous drum printing, with high output and low cost. 2. Domestic manufacturers of gravure printing equipment, such as Shaanxi beiren and Zhongshan Songde

resin relief printing 1. Characteristics of resin embossing fixture printing a. the quality of printing fine points is worse than that of other methods, B. the printing resistance of printing plate is lower than that of gravure and flexo, C. It is easier to control the printing color difference than offset printing, but not as good as gravure and flexo printing, D. the cost and cycle of plate making are lower than that of gravure and flexo printing, e. UV ink printing is applied to make the printing color more beautiful, dry faster and have high one-time forming efficiency, Suitable for medium and large batch production. 2. Embossing equipment: mainly Ko pack and luotie in foreign countries

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