Rongxin New Material (Jiangsu) Co., Ltd. , https://www.rongxinxcljs.com
Kraft paper Printing can be achieved through various methods such as flexographic, gravure, offset, and screen printing. However, achieving optimal results requires a solid understanding of printing technology fundamentals, including knowledge of inks and the printability of kraft paper. Proper ink selection, precise control of equipment settings, and careful application are essential to ensure the best possible print quality.
For smaller packaging or printing facilities, especially those that are newly established or have limited resources, challenges in maintaining consistent print quality may arise. Here are some key considerations when printing on kraft paper:
Firstly, color reproduction on kraft paper is more challenging compared to SBS (Solid Bleached Sulfate) paper. This is particularly true for regular kraft board, which has a dark brown tone. The inherent color of the paper affects how inks appear, making it harder to achieve vibrant, accurate colors. To overcome this, using bright and eye-catching colors is recommended. Soft or light colors tend to be more difficult to achieve due to issues with ink density, opacity, and resistance to abrasion. In some cases, adding a small amount of white to the ink can help achieve softer tones, especially for pastel shades. UV inks are also becoming popular among manufacturers to enhance color vibrancy and durability.
Ink selection plays a crucial role in the success of kraft paper printing. Unlike SBS or standard printing papers, kraft paper is uncoated, has a looser structure, and higher porosity. This means it absorbs ink more readily, which can lead to dull colors and even ink pulling out fibers from the paper surface. Flexographic printing is generally preferred for kraft paper, while offset printing is not ideal for full-length kraft sheets due to the rough texture and high absorbency. Dust generated during the production process should also be carefully managed to avoid contamination.
Post-printing processes like die-cutting benefit from the strength and predictable fiber properties of kraft paper. It performs well with embossing and cutting, but care must be taken to avoid rebound by using deep indentation lines. Die cutters need to be sharp, and the perforation lines should be narrow to minimize damage. Adhesive choices are also important—high-solid, high-viscosity resins are often used for low-temperature bonding. Traditional hot-melt adhesives work well with coated kraft paper, and due to its lightweight nature, kraft board is compatible with high-speed box-making machines.
Choosing the right paper is essential for meeting modern packaging demands. Kraft paper offers a natural, healthy aesthetic that appeals to consumers looking for eco-friendly or retro-style packaging. Its contrast with white backgrounds can make products stand out more. Additionally, kraft paper provides excellent strength, making it ideal for food packaging where durability is critical. Whether it's a bakery item, a beverage cup, or frozen food container, kraft paper’s structural integrity ensures the package remains intact under various conditions.
This information comes from China Packaging Bags Trading Network.