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To fully grasp the techniques associated with coated paper, it is essential to first understand its characteristics and applications.
Characteristics of Coated Paper:
Coated paper is distinguished by its exceptionally smooth and flat surface, high smoothness, and excellent gloss. The coating used in its production typically has a whiteness exceeding 90%, with extremely fine particles. After being calendered using a supercalender, the smoothness of coated paper generally ranges from 600 to 1000 seconds. Additionally, the coating is evenly distributed across the paper's surface, resulting in an aesthetically pleasing white color. Key requirements for coated paper include a thin and uniform coating, absence of bubbles, and appropriate adhesive content to prevent powder or fiber shedding during the printing process. Furthermore, the para-xylene absorption of coated paper should be appropriately controlled.
Applications of Coated Paper:
Coated paper is one of the primary types of paper utilized in Shenzhen printing factories. Its scientific name is "coated printing paper," and it is widely employed in various real-life scenarios. Examples include wall calendars, posters sold in bookstores, book covers, illustrations, art books, picture albums, and product manuals for electronic appliances. It is also extensively used in packaging, paper handbags, labels, trademarks, and more. Common coated paper specifications range from 70 grams per square meter to 350 grams per square meter.
Classification of Coated Paper:
Coated paper can be categorized into single-sided coated paper, double-sided coated paper, matte coated paper, and fabric-textured coated paper. Based on quality, it is divided into three grades: A, B, and C. The main raw materials include coated base paper and coating. Requirements for copperplate base paper involve uniform thickness, low elasticity, high strength, and good water resistance. The paper surface must be free from defects such as spots, wrinkles, or holes. The coating consists of high-quality white pigments (e.g., kaolin, barium sulfate), adhesives (e.g., polyvinyl alcohol, casein), and auxiliary additives.
Composition of Coated Paper:
Coated paper is available in both flat and roll forms. Copperplate base paper is manufactured using bleached chemical wood pulp or a mixture of bleached chemical grass pulp on a paper machine. By adding white pigments (e.g., kaolin, talcum powder, calcium carbonate, titanium dioxide), adhesives (e.g., polyvinyl alcohol, casein, modified starch, synthetic latex), and auxiliary materials (e.g., gloss agents, hardeners, plasticizers, dispersants, wetting agents, whitening agents, fluorescent brighteners, color conditioners), the paper undergoes uniform coating processing on a coating machine, followed by drying and supercalendering. This results in a uniform and compact structure with high whiteness (>85%), smooth surface, high gloss, and a firm, consistent coating.
