In the food and beverage industry, packaging is not just the outer container of a product, but also an indicator of reliability, traceability, and legal compliance. PET bottles are one of the most commonly used packaging types in this sector. Coding applications on this transparent, lightweight, and economical material are critically important for both legal regulations and consumer safety.
Information such as production date, expiration date, lot number, and serial codes must be applied clearly and permanently to the surface of PET bottles using the correct technology. However, factors such as the structure of the PET material, the speed of the production line, the humidity level, and the ink drying time are technical details that must be considered in this process. In this article, Electrojet Technology examines the most accurate methods for PET bottle coding from a technical perspective and offers industry-specific solutions.
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Why is the correct coding technology vitally important on PET bottles?
Coding applications on PET bottles form the basis of processes such as product tracking, quality control, warehouse management, and recalls. According to food safety laws, every product packaging must contain clear, legible, and indelible information. However, this information must be written in a way that is easily readable by consumers and traceable at every stage of the distribution chain.
An incorrectly chosen branding method can lead to the print being erased, illegible, or the bottle being damaged during the production process. This directly jeopardizes brand reputation and legal compliance.
Inkjet Coding on PET Bottles: Where Flexibility and Speed Meet
Inkjet coding systems are one of the most preferred methods in PET bottle production. Electrojet's CIJ (Continuous Inkjet) systems provide clear and uninterrupted printing even on high-speed filling lines. In CIJ systems, ink is sprayed at a high frequency, creating text without touching the PET surface.
This technology allows information such as dates, batch numbers, and QR codes to be printed on the bottom, neck, or cap of bottles without stopping the production line. The ink dries quickly but has high adhesion even on transparent and slippery PET surfaces. Moreover, solvent-based ink options provide durability even in humid environments.
Another advantage of inkjet systems is that they allow for variable data printing. It is possible to print a different code on each bottle. This feature provides a significant advantage, especially in processes such as product safety, traceability, and campaign tracking.
Laser Marking: Not Suitable for All Surfaces
While laser marking systems produce excellent results on surfaces such as metal, glass, or hard plastic, their use on PET bottles is limited. Because PET material is easily deformed by heat, a high-powered laser beam can compromise the structural integrity of the bottle. Furthermore, laser prints generally have low contrast and are difficult to read on transparent surfaces.
Therefore, laser systems are preferred for PET bottle coding only under specific conditions—for example, on labels or opaque bottle surfaces. Filling line temperature, bottle thickness, and marking area directly affect the applicability of laser technology.
At Electrojet, we develop low-power, wavelength-optimized laser systems for these specific applications; however, we generally find inkjet technology to be safer and more efficient for PET surfaces.
Technical Factors to Consider During the Coding Process
The durability and legibility of prints on PET bottles are affected not only by the technology used but also by the conditions of the production environment. Humidity on the bottle, temperature variations before and after filling, ink drying time, and the shape of the bottle directly determine the quality of the print.
Therefore, in addition to the correct coding technology, devices that work in full synchronization with the production line, have an automatic cleaning system, and allow adjustment of ink density and spray frequency should be preferred. Electrojet inkjet systems allow you to manage all these parameters digitally and offer full integration into your production line.
Electrojet Technology: Zero Defects, Maximum Reliability
Coding on PET bottles is key to fulfilling both operational and legal responsibilities. Electrojet Technology, with its specialized inkjet systems developed for food and beverage manufacturers, keeps pace with your production speed, exceeds readability standards, and minimizes your investment costs.
Its integration with automation systems enables data-driven production and guarantees the traceability of every print. All of this is achieved in full compliance with the hygiene and quality requirements of the food industry.
Transparent Material, Clear Coding
Coding on PET bottles requires far more precision and technical expertise than it appears. A system that does not compromise food safety, communicates clearly with the consumer, and can operate seamlessly on production lines is a fundamental need for the industry.
A branding process supported by the right technology not only fulfills a legal requirement; it also makes your brand's professionalism visible. Electrojet makes this process smart for you.
