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Watching this makes you knowledgeable. It turns out that there are so many intricacies to gravure ink!
Plastic gravure ink is a type of volatile solvent-based ink, typically composed of pigments, binder resins, main resins, additives, fillers, and volatile solvents. During the gravure printing process, there are many aspects to pay attention to regarding gravure ink. I've learned a lot! It turns out there are so many details to consider!
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Characteristics that gravure ink must possess
In the gravure printing process, the gravure cylinder rotates while being coated with ink on its surface. At the same time, the doctor blade scrapes off the ink from the non-image areas of the cylinder, leaving only the ink on the image areas. The ink from the image areas is then transferred to the substrate film through pressure. From this printing process, gravure ink must have the following characteristics:
1. The working ink is a thin fluid with good fluidity, making it easy to fill the mesh holes on the gravure cylinder.
2. The ink has good doctor blade adaptability, meaning it is easy for the doctor blade to scrape off the ink from the non-image areas on the surface.
3. The ink has sufficient cohesion to prevent centrifugal force imbalance during the rapid rotation of the gravure cylinder.
4. The working ink has good transfer, overprinting capability, and good viscoelasticity, meaning the ink in the mesh holes on the gravure cylinder easily transfers to the substrate film and to the previously printed ink without the image, text, or line dots spreading or enlarging.
5. After the working ink is transferred to the substrate film, it has good fluidity to ensure a smooth ink film is formed.
6. The working ink dries quickly through solvent evaporation, with a drying speed that matches the printing speed.
7. The working ink has a certain degree of re-dissolvability to ensure that the untransferred ink in the mesh holes can re-dissolve into the working ink system.
The performance of gravure ink must first meet the needs of the above gravure process. Additionally, the ink film transferred to the film must adapt to the effects and stimuli of subsequent processes and various usage conditions during the use of the printed product.
Untreated ink (original ink) cannot directly meet the above requirements. It must be adjusted to working ink (working ink) based on the ink's properties and actual process needs before use. Although the properties of the original ink limit and determine the adjustment space for the working ink, this adjustment is still very important.
The quality indicators and performance requirements for plastic gravure ink are clearly specified in relevant standards such as QB/T 2024—2012. However, the standards only provide basic requirements, and compliance with national standards does not fully indicate that the ink has good printing suitability.
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