If you have any needs pls contact me-
Whatsapp number of Ivy: +86 18933516049 (My Wechat +86 18933510459)
Email me: 01@songhongpaper.com
I. Introduction
Different printing methods require paper with specific technical properties. For example, newsprint, used for newspapers and periodicals, and letterpress paper, used for book printing, exhibit excellent ink absorption and minimal show-through. Offset newsprint, designed for multicolor printing, demonstrates high water absorption and dimensional expansion. Gravure printing paper, such as that used for securities, features a fine surface finish, ensuring sharp and realistic printed lines.
Printing paper is specifically engineered for printing applications. Based on usage, it can be categorized into newsprint, book and magazine paper, cover paper, security paper, among others. Alternatively, classification by printing method includes letterpress, gravure, and offset printing papers.
II. Board Categories
1. Fine Corrugated Board (E-flute): Also known as E-type corrugated board, this material is thin yet rigid, commonly used in retail packaging boxes. It may also serve as a protective separator for fragile items such as ampoules.
2. Straw Board (Yellow Cardboard): Characterized by its yellowish hue, straw board is primarily used for packaging footwear, hardware, and low-cost goods. When laminated with decorative label paper, it is suitable for apparel and knitwear packaging. It is manufactured from 100% natural lime-processed rice or wheat straw pulp, often blended with recycled paper.
3. Linerboard: Used as the outer layer of corrugated board, linerboard forms the exterior surface of shipping containers. It must possess high mechanical strength, including resistance to compression, folding, tensile stress, abrasion, and puncture, along with adequate water resistance and resilience. Additionally, it should offer good surface appearance and printability.
4. Self-Adhesive Paper: Typically composed of high-strength white board paper coated with an adhesive layer, this paper is widely used for printing labels and trademarks.
5. Glassine Paper: A smooth, glossy paper with a translucent finish on both sides, often used for packaging and interleaving.
6. Aluminum Foil Laminated Paper: Produced by bonding paper with aluminum foil using adhesives, including vacuum-deposited aluminum-coated variants. Commonly used in cigarette and confectionery packaging.
7. Corrugated Board: Includes honeycomb board. This multi-layer structure is formed by shaping thick paper into fluted patterns and adhering them to linerboard through specialized processes.
III. Paper Types
1. Coated Paper: A coating composed of pigments, binders, and additives is applied to the paper surface using specialized equipment. After drying and calendering, a dense, smooth layer is formed, enhancing surface quality and print performance. Commonly used for cigarette boxes, labels, and folding cartons.
2. Offset Paper: Primarily single-sided offset paper, featuring a white, smooth surface-though with lower whiteness, density, and smoothness than coated paper. Super-calendered offset paper offers improved smoothness and compactness. Often laminated with yellow board to form packaging boxes after printing.
3. Label Paper (Trademark Paper): Features a bright white surface and excellent printability, ideal for producing brand labels and trademarks.
4. Kraft Paper: Includes boxboard, cement sack paper, corrugating medium, and brown cardboard. Made from sulfate pulp of softwood, kraft paper is strong, durable, and has a characteristic brownish surface. Available in single-faced glossy, double-faced glossy, lined, and unlined varieties, with varying quality grades. Widely used for industrial product packaging, file folders, and inner wraps for textiles and consumer goods. Classified into grades U, A, and B.
5. Corrugating Medium: During manufacturing, this paper is shaped into flutes. Once assembled into corrugated board, it provides elasticity, flat crush resistance, and influences vertical compression strength. It must have a uniform thickness and defect-free surface-free from wrinkles, cracks, or holes-to prevent breakage during production and ensure consistent quality.
6. Sack Kraft Paper: Similar to standard kraft paper, typically made from softwood sulfate pulp. In China, blends with bamboo, cotton stalk, and rag pulps are also used. This paper exhibits high mechanical strength and is used for industrial packaging such as cement, pesticide, and fertilizer bags. It requires controlled air permeability and high elongation to withstand filling processes.
7. Cellophane: A transparent inner lining and decorative wrapping material that allows clear visibility of contents. When coated with plastic, it gains moisture-proof, waterproof, airtight, and heat-sealable properties, offering superior product protection. Compared to conventional plastic films, cellophane is non-static, dust-resistant, and has excellent fold retention. Available in clear, colored, and tinted varieties.
8. White-Faced Chipboard (White Card Paper): A stiff, smooth-surfaced board suitable for rigid packaging applications.
9. White Board Paper: Available in single-faced and double-faced variants. Double-faced white board is reserved for premium packaging, while single-faced is commonly used for cosmetics, pharmaceuticals, food, and stationery boxes.
10. Composite Paper: Created by laminating paper or board with materials such as plastic, aluminum foil, or fabric using adhesives. This process enhances physical and barrier properties, including water, moisture, oil, and aroma resistance, as well as gas tightness. Additional functional benefits include heat sealability, opacity, heat resistance, and improved aesthetics. Production methods include wet lamination, dry lamination, hot melt, and extrusion coating.
