CPE frosted zipper bag is highly favored in the packaging field due to its unique texture and good practicality, and the printed pattern can further give it personalization and commercial value. Different printing processes will present different visual effects and quality characteristics on CPE frosted zipper bags. From ink adhesion to pattern durability, each process has its own unique technical path and applicable scenarios.
Gravure printing is one of the commonly used printing processes for CPE frosted zipper bags. The principle of this process is to transfer ink to the surface of the bag through a metal gravure engraved with graphics. Before printing, it is necessary to make a high-precision gravure, whose graphic part is lower than the blank part and can accommodate more ink. During printing, the gravure cylinder rolls in the ink tank to fill the graphic part with ink, and then the ink in the blank part is scraped off by a scraper, and then the ink in the gravure graphic part is transferred to the CPE frosted zipper bag by pressure. The advantages of gravure printing are high printing precision, strong color saturation, rich pattern layers, and even complex gradient colors and fine lines can be clearly presented. Due to the high production cost of gravure, it is suitable for mass production of CPE frosted zipper bags, such as fixed packaging of some branded goods, which can ensure the consistency and high quality of the pattern, and has fast printing speed and high production efficiency.
Flexographic printing is also a widely used process. It uses flexible plates and uses anilox rollers to transfer ink for printing. The graphic part of the flexographic plate is raised. In contrast to the gravure plate, during the printing process, the anilox roller evenly transfers a certain amount of ink to the flexographic plate, and then transfers the ink to the surface of the CPE frosted zipper bag through pressure. The plate material of flexographic printing has good elasticity and strong adaptability to CPE frosted materials. It can complete printing without damaging the surface of the bag. This process has good ink transferability, is suitable for the use of water-based inks, is relatively environmentally friendly, and meets the current demand for green packaging. Moreover, the cost of flexographic printing is relatively low, the plate making cycle is short, and it is more friendly to small and medium-sized batches of CPE frosted zipper bag printing orders. It can flexibly meet the personalized pattern needs of different customers, whether it is a simple text logo or a creative illustration pattern, it can be well presented.
Screen printing also has a place in cpe frosted zipper bag printing. Its principle is to transfer the ink through the mesh of the image part to the cpe frosted zipper bag through the extrusion of the scraper to form the same image as the original. The screen printing screen is composed of a silk screen, a screen frame and a photosensitive adhesive. The image is made on the screen through exposure, development and other steps. The characteristics of this process are a thicker ink layer, a strong three-dimensional sense and covering power, and a significant printing effect for some patterns that need to highlight the texture or have high covering power. For example, when printing patterns with metallic texture or fluorescent effects on cpe frosted zipper bags, screen printing can better achieve it. However, the printing accuracy of screen printing is relatively low, and the printing speed is slow. It is suitable for small-area patterns or personalized customized cpe frosted zipper bag printing, especially some product packaging that pursues unique artistic effects.
Digital printing is a new process that has emerged with the development of science and technology. It does not require plate making, and directly sprays ink from the pattern in the digital file onto the cpe frosted zipper bag through the nozzle. Digital printing is highly flexible and can achieve fast plate change and personalized customization. Even a single CPE frosted zipper bag can be printed, and the pattern design can be easily modified, which can meet the diverse needs of customers in a timely manner. Its printing is rich in color and can achieve a photo-like effect. It performs well for some complex color patterns and gradient effects. However, digital printing still has certain limitations in speed and cost. The ink cost is relatively high and the printing speed is slow. It is not suitable for ultra-large-scale industrial production, but it has unique advantages in the personalized and small-batch CPE frosted zipper bag printing market.
Hot stamping is also an important means to enhance the texture of CPE frosted zipper bags. It transfers the hot stamping foil to the surface of the bag through heating and pressure. Hot stamping foil is available in a variety of colors and materials, such as gold, silver, laser, etc., which can give CPE frosted zipper bags a gorgeous and high-end visual effect. During the hot stamping process, the temperature, pressure and time parameters need to be adjusted according to the characteristics of the CPE frosted material and the hot stamping foil to ensure that the hot stamping foil can be firmly attached to the surface of the bag, and the pattern is clear and the edges are neat. Hot stamping is often used for printing local patterns such as brand logos and decorative lines. It can play a finishing touch and enhance the overall grade of CPE frosted zipper bags, especially for the packaging of high-end products.
UV printing is a process that uses ultraviolet rays to quickly solidify ink. It can enhance the wear resistance and glossiness of patterns in CPE frosted zipper bag printing. UV ink has good fluidity and adhesion before curing. After printing on the surface of the bag, it is instantly cured by ultraviolet rays to form a hard ink film. This process has high color vividness, good gloss, and fast ink curing speed, which can effectively prevent the pattern from being rubbed and falling off, and improve the durability of CPE frosted zipper bags. UV printing can also be combined with local glazing and other processes to perform special treatment on specific areas of the pattern to increase the visual layering and three-dimensional sense. It is often used in some CPE frosted zipper bag printing with high requirements for printing quality.
In actual production, in order to achieve the best printing effect, multiple printing processes are often combined according to the purpose, design requirements and cost budget of CPE frosted zipper bags. For example, we first use gravure printing to complete large-area background color and complex pattern printing, then use screen printing to add local special effect patterns, and finally use hot stamping technology to highlight the brand logo. By complementing the advantages of different processes, we can create a CPE frosted zipper bag packaging that is both beautiful and practical to meet the diverse needs of the market.
