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Coding solution for Flexible Packaging
- May 30, 2018 -

Flexible packaging is the most important category in the packaging industry. The output value of flexible packaging products exceeds half of the packaging industry.

All kinds of paper, plastic, paper, plastic, plastic, aluminum and other flexible packaging are widely used for packaging snack foods, dry goods, baked goods, candy, chocolate, sliced frozen fresh foods, frozen foods, coffee, tea, powdered foods, bags Loading medicines, hardware parts and other commodities.

In order to ensure the safety of foods and medicines, real-time information such as production dates and product lot numbers is printed on the flexible packaging of foods and medicines, and has become an important part of the production process of foods and pharmaceuticals. Real-time information enables manufacturers to track products when needed and provide protection when recalling products on a large scale. It can be said that coding technology has become an important part of modern quality systems.

The traditional flexible packaging coding technology relies on letterpress printing to create images using characters on the letter holder. The image is mechanically embossed or rolled onto the film surface.

Common letterpress printing techniques include hot stamping, wet ink, and one-touch Ink Roll Coding Machine.

In recent years, the continuous inkjet printing system (CIJ) has also been applied to flexible packaging. Inkjet printers print ink through the print head to print a variety of data on low-level packaging and paper boxes, including simple date codes, logos, bar codes, and serial numbers.

Traditional letterpress printing techniques and continuous inkjet printing systems have their own advantages, but they also have many deficiencies, such as the traditional Hot Stamp ribbon Coder and Ink Roller coder can not print in real time, need to manually update the date and batch number, the traceability is limited; when printing, there is no standard LOGO, bar code, or rotary image printing method, and each printed character needs character fonts.In production, Hot Stamp ribbon Coder require “preheating time” before they are manipulated, and “cooling time” is required to change information. This will increase production time, and once the font size is not properly aligned, it will cause packaging film worn out. In addition, font wear or loss can make the print result unreadable, while the length of the Hot Stamp ribbon is also relatively short, the uniform length of the domestic ribbon is only 100 meters; the ink of the Ink Roller coder needs time to dry or may become dirty and stains require special cleaning fluids to be cleaned, and most ink roller need to be warmed up (up to 30 minutes after heating the ink roller) and need to be cooled before changing the code content.

Continuous inkjet printers have the advantages of wide application range and simple operation. However, fonts, character options, logos or bar code functions are limited, printing quality is general, the printing direction must be consistent with the moving direction of the substrate, and the print heads need to be cleaned periodically and the filters need to be replaced regularly, cleaning of floors stained with ink, machines, conveyor belts, etc., and the special inks and solvents used in them often contain harmful substances, and may require ventilation and other devices.

The latest laser and digital thermal transfer coders can greatly improve the problems of traditional coders, especially digital thermal transfer coders, which can improve the traceability while improving the code quality, equipment reliability and flexibility, suitable for a variety of flexible packaging materials.