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Coated paper is a type of high-quality paper created by applying a layer of coating material onto a base paper. Among the various types, pigment-coated paper is the most commonly used and is widely recognized for its excellent printing performance. As China's living standards continue to rise, the demand for coated paper has grown steadily over the years. Understanding and optimizing the printing suitability of coated paper is therefore essential for producing high-quality printed materials.
The main components of coated paper are base paper and coating paint. The base paper is typically made from hardwood and softwood pulp, while the coating paint consists of pigments, adhesives, and some additives in specific proportions. These raw materials—especially pulp, pigments, and adhesives—play a major role in determining the cost of production. In recent years, rising costs of crude oil and paper pulp have put pressure on paper manufacturers, prompting them to explore new materials and processes to reduce expenses.
While these innovations help cut costs, they can also affect the properties of the paper, particularly its printability. If the printing process remains unchanged, it increases the risk of printing defects. This article explores some of the new techniques used in the industry and how they impact the printing behavior of coated paper.
One common approach is to replace part of the pulp with pigments. Since pigments are often cheaper than pulp, increasing their proportion can lower production costs. However, this requires more adhesive to bind the pigment particles together. Starch is often used as an alternative to traditional adhesives. While this reduces costs, it can weaken the surface strength of the paper, leading to issues like paper dusting or peeling during high-speed printing, especially in web offset printing.
Another strategy involves replacing some traditional adhesives with starch-based products. Starch is renewable, affordable, and environmentally friendly, making it an attractive option. However, unmodified starch may not perform well due to its water absorption and coagulation properties. Modified starches like oxidized or esterified starch are often used instead. But increasing the starch content beyond certain limits can reduce the paper’s surface strength and cause problems such as uneven coating, ink mottling, and back dirt.
Some companies are now experimenting with bio-latex as an alternative to traditional petroleum-based latex. Bio-latex is produced using starch and other modified compounds, offering better environmental performance. However, it may reduce the paper’s mechanical strength, leading to issues like tearing, flaking, and poor folding resistance. These changes can be challenging for printers who are not familiar with the new materials.
In conclusion, while new technologies in papermaking help reduce costs, they can negatively impact printability. It's crucial for both papermakers and printers to understand these changes and work together to ensure smooth production. By improving communication and adapting to new materials, the industry can achieve better results and create a more sustainable future.Single Pole Clothes Hanger,Metal Clothing Rail Hanger,Metal Foldable Hanger,Single Pole Clothes Drying Hanger
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