Plastic film substrates are currently commonly used for in-mold labels, which are printed in a traditional manner. The surface is coated with a layer of UV or EB cured varnish for protection, and the back of the label is coated with a solid chemical adhesive. In-mold label materials are suitable for a variety of printing processes and different inks, including: screen printing, UV relief printing, flexographic printing, gravure printing, and offset printing. Before selecting the ink, the adhesion, scratch resistance, chemical resistance and other properties of the ink on the in-mold label material should be tested according to the requirements of the final application.
There are two printing processing methods for in-mold labels: web printing and sheet printing.
1. Web printing processing: divided into online once processing and extension multiple processing. These two processing methods are related to the factory's own equipment and label design requirements. If printing a label with a bronzing pattern, and the printing machine has a round pressing and bronzing and die cutting device, the processed label can be formed at one time; if there are only separate bronzing machine and die cutting machine, the label can only be processed multiple times carry out. The characteristics are fast production speed and high efficiency, but due to the high cost of roll making, it is more suitable for mass production.
2. Sheet-fed printing process: usually silk screen and offset offset printing. This method is completed by multiple processes on multiple devices. The printing process is related to the process design. The processing is more flexible and the plate making cost is lower than the reel method. It is suitable for small batch production; the printing effect is good, the screen printing is on-site and the offset printing is layered. Both are better than web printing.
Offset printing process
1. Offset features
A. The printing quality of fine dots is better than other printing methods,
B. The line and solid printing effect and color saturation are inferior to other printing methods,
C. It is more difficult to control the color difference than other printing methods,
D. For short-run 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. It is suitable for in-mold labels with small batches, multiple varieties, and high printing quality requirements. It is more suitable for the current status of China's label printing market.
2. Offset printing process
A. The amount of powder sprayed is moderate, and the accumulation of printed products 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 the printing.
C. In printing, the amount of fountain solution should be reduced by 10% to 15% compared to printed paper products due to poor hygroscopicity of substrate (subject to non-dry plate) Too much fountain solution will cause false drying and ink emulsification during printing. The pH value of fountain solution is controlled between 6 and 6.5.
3. Offset printing equipment: Most domestic printing companies use Heidelberg sheet-fed offset press series Speedmaster CD 74-medium format sheet-fed offset press features:
* Wide range of substrates, from thin paper to cardboard to plastic film,
* Suitable for high-speed long-form jobs, fully automatic feed preparation and easy-to-control paper feeding system,
* The digital CP 2000 printing control system supports the rapid replacement of paper format and stack.
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