[Technology] Introduction of offset paper used for printing film

In the world of printing, one commonly used material for film lamination is offset paper. Today, we’ll take a closer look at the properties and applications of this material to help you better understand its role in the printing process. Film lamination involves bonding plastic film with paper to create a high-quality composite product that enhances both the visual appeal and value of the paper. This technique is widely used in various printing applications, such as packaging, brochures, and promotional materials. The types of paper commonly used for lamination include offset paper, art paper, and white cardboard. Offset paper is known for its opacity, low stretch, and smooth surface, making it ideal for high-quality printing. It’s typically used in offset presses for printing covers, magazines, advertisements, labels, maps, posters, and book inserts. Its versatility allows it to handle multi-color printing effectively, delivering vibrant and sharp results. There are two main types of offset paper: double-sided and single-sided. Double-sided offset paper is available in weights like 70g/m², 80g/m², 90g/m², 100g/m², and 120g/m², while single-sided options usually range from 50g/m² to 80g/m². The moisture content of the paper typically falls between 4% and 9%. A standard order consists of 500 sheets of flat paper, with the total weight depending on the paper's size and thickness. To ensure optimal performance in offset printing, the paper must meet several key criteria: 1. **High strength and good water resistance** – Offset printing requires paper that can withstand high tension without tearing or flaking. The surface must be strong enough to prevent dust or fibers from sticking to the rubber blanket, which could cause print defects. Additionally, the paper should resist water to maintain stability during the wetting process. 2. **Low stretch and high stiffness** – Paper with minimal stretch ensures accurate registration during multi-color printing. If the paper stretches too much, it can lead to misalignment and poor film quality. High stiffness also helps the printed sheet separate easily from the rubber cylinder. 3. **Smooth surface and moderate ink absorption** – A smooth surface ensures even ink distribution, resulting in clear and sharp images. However, if the paper absorbs too much ink, it may cause issues like weak prints, through-printing, or a dull finish. Offset ink relies mainly on oxidation and drying rather than absorption, so the paper should not absorb excessive amounts. 4. **Neat appearance and tight texture** – The paper should be free from imperfections like wrinkles, spots, holes, or impurities. A tightly packed structure, along with good sizing and calendering, ensures consistent quality and a clean, uniform look. By understanding these characteristics, you can make more informed choices when selecting offset paper for your printing projects. Whether you're producing marketing materials, packaging, or publications, using the right paper can significantly enhance the final output.

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