PET blister box has good transparency, glossiness and dimensional stability, which provide a certain basis for printing. However, its surface is smooth and chemically inert, which poses a challenge to the adhesion of ink. Before printing, the surface of PET blister box needs to be pretreated, such as corona treatment, which oxidizes and polarizes the surface molecules through high-voltage discharge, increases the surface energy, and thus improves the wettability and adhesion of the ink.
Selecting the right ink is the key to achieving exquisite printing. Inks specifically for PET materials should be selected. Such inks usually have good adhesion, weather resistance and color vividness. For example, ultraviolet curing (UV) ink is widely used in PET blister box printing. It can cure quickly under ultraviolet light to form a hard, wear-resistant and high-gloss ink film, which not only has exquisite printing effects, but also dries quickly, which can improve production efficiency.
Different printing processes have different printing adaptability to PET blister box. Common printing processes include screen printing, offset printing and digital printing. Screen printing is suitable for printing large areas of color blocks and simple patterns. It can achieve a thicker ink layer thickness, making the color more saturated, but it may be less effective for fine patterns. Offset printing is good at presenting high-precision images and texts with high color reproduction, but it has strict requirements on the drying speed and viscosity control of the ink. Digital printing has the advantages of high flexibility and no need for plate making, which can meet the printing needs of small batches and diversification, but the cost is relatively high.
During the printing process, accurate quality control is essential. Parameters such as ink viscosity, drying time, printing pressure and speed should be strictly controlled. For example, too high ink viscosity may cause uneven printing or drawing, while too low viscosity may affect color saturation and adhesion. Too high printing pressure may cause the pet blister box to deform, while too low printing pressure cannot ensure sufficient ink transfer. By regularly testing and adjusting these parameters, ensure that the printed pattern is clear, the color is uniform, and the edges are sharp.
Post-printing post-processing can further improve the printing effect and product durability. For example, the lamination process can cover a transparent film on the surface of the printed pattern to enhance the wear resistance, water resistance and glossiness, making the pattern more durable and bright. In addition, hot stamping, embossing and other processes can add unique decorative effects to the pet blister box, enhancing the grade and attractiveness of the product.
While pursuing exquisite printing, we should also pay attention to environmental protection and safety. Choose inks and printing processes that meet environmental protection standards to reduce the emission of volatile organic compounds (VOCs) and reduce harm to the environment and operators. For example, water-based ink uses water as a solvent and has the advantage of low VOC emissions, which is increasingly attracting attention and application.
With the continuous advancement of science and technology, pet blister box printing technology is also continuing to innovate. For example, the emergence of nano-printing technology is expected to further reduce costs and energy consumption while improving printing accuracy and color expression. In the future, intelligent printing equipment and digital workflows will make the printing of pet blister boxes more efficient, accurate and personalized, meeting the market's growing demand for exquisite packaging.
