[Technology] Introduction of offset paper used for printing film

In the world of printing, we often use offset paper for film lamination to enhance the quality and appearance of printed materials. Today, we’ll take a closer look at the characteristics and applications of this material, helping you understand why it's widely used in the industry. Film lamination involves bonding plastic film with paper to create a high-quality hybrid product that adds value and sophistication to the final output. The most commonly used papers for lamination include offset paper, art paper, and white cardboard. Among these, offset paper stands out due to its excellent printability and versatility. Offset paper is specifically designed for use on offset printing presses. It is ideal for printing covers, magazines, advertisements, labels, inserts, maps, posters, packaging, and various types of book and periodical content. Its smooth surface and low stretch make it perfect for multi-color printing, ensuring vibrant and accurate results. There are two main types of offset paper: double-sided and single-sided. Double-sided paper is typically used in weights like 70g/m², 80g/m², 90g/m², 100g/m², and 120g/m², while single-sided paper comes in lighter weights such as 50g/m², 60g/m², 70g/m², and 80g/m². The moisture content usually ranges between 4% and 9%. A standard order consists of 500 sheets of flat paper, with the total weight depending on the size and thickness of the paper. To ensure optimal performance in offset printing, the paper must meet several key criteria: First, it needs to have high strength and good water resistance. Offset printing applies significant tension to the paper, so it must have a strong surface with a tight structure to prevent dusting or fluffing. If the surface isn't strong enough, fibers and fillers can stick to the rubber blanket, leading to poor print quality and sticky blankets. Additionally, the paper should resist water to work well with the wetting system used in offset printing. Second, the paper should have minimal stretch and high stiffness. A high stretch rate can cause dimensional changes after wetting and drying, which may affect color registration and film quality. Since offset ink has high viscosity, if the paper isn’t stiff enough, it might not separate easily from the printing cylinder, causing issues during the process. Third, the paper’s surface should be smooth, and its ink absorption should be moderate. An uneven surface or irregular fiber distribution can lead to weak image transfer and unclear details. If the paper absorbs too much ink, the binder in the ink may penetrate into the paper quickly, leaving pigment particles on the surface. This can result in problems like weak prints, through-printing, and dull gloss. Offset ink relies mainly on oxidation and polymerization to dry, with only a small portion being absorbed by the paper. Finally, the paper should have a clean appearance and a tightly packed texture. It should be free from wrinkles, streaks, spots, holes, sand, or impurities. The surface should be white, uniform, and well-sized and calendered to ensure consistent quality. By understanding these features, you can better choose the right offset paper for your printing projects, ensuring both efficiency and high-quality results.

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