To work in a flexible packaging factory, it's essential to master the printing techniques for six common types of flexible packaging film substrates. Let’s explore them together:
1. BOPP (Biaxially Oriented Polypropylene) is one of the most widely used materials in flexible packaging. Its printing process typically involves gravure printing, using polyamide or chlorinated polypropylene inks. It's important to maintain proper tension and embossing force during printing, and the drying temperature should be kept below 80°C for optimal results.
2. When printing on BOPET (Biaxially Oriented Polyester), special attention must be given to its thinness, which makes it prone to wrinkling. High tension is required during printing, and the ink selection is crucial, as some inks may cause delamination. Static electricity can also be an issue, leading to dust accumulation and scratches. Maintaining a slightly higher humidity in the printing area can help reduce these problems.
3. For BOPA (Biaxially Oriented Polyamide) printing, the material is highly sensitive to moisture and can easily deform. Therefore, the printing environment should not be too humid. The unprinted film should be kept in its original aluminum packaging until ready for use. Before printing, the nylon film should be preheated to around 50–80°C. Adjust the printing tension and pressure accordingly, and choose inks that are compatible with the product structure. For cooking bags, it's necessary to use heat-resistant inks. After printing, the products should be tightly packed and stored in a dry, well-ventilated room for aging and lamination.
4. Printing on K-coated films (KOP, KPA, KPET) requires extra care due to their uneven surface and brittle PVDC layer. The printing tension and embossing pressure should be kept low to avoid damage. These films often have poor ink transferability, making overprinting challenging. When printing shallow screens, a flower-like pattern may appear. Using a harder pressure roller can help improve print quality. Additionally, solvent selection is critical—using the wrong one may dissolve the coating. Residual solvents can cause blocking, so adequate drying and cooling are essential. Matte films can be printed on the glossy side with OPP, but the matte layer is sensitive to high temperatures, so careful control of the drying temperature is needed.
5. Pearlescent films are best printed using transparent surface inks. Heat-shrinkable films require a low drying temperature and special heat-shrinkable inks. If using PVC heat-shrinkable film, it's important to consider the solvent's compatibility with the film material to avoid any adverse effects.
6. Unstretched PP and PE films have very low tension during printing, making overprinting more difficult. When designing samples, it's crucial to account for potential deformation during the printing process.
By understanding these key points, you'll be better equipped to handle various flexible packaging materials and ensure high-quality printing outcomes. Whether you're working with BOPP, BOPET, BOPA, or other specialized films, attention to detail and proper technique are essential for success in the industry.
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