In the fields of printing and design, the choice of paper size is crucial as it directly affects the visual effects and practicality of printed materials. Below is a detailed overview of common paper sizes, units of measurement, specifications, and names.

Common Paper Sizes

Zhengdu (Chinese standard) Paper Sizes:

Zhengdu Quankai (full-size): 781×1086 mm, commonly used for large promotional posters.

Zhengdu 2kai: 540×740 mm, suitable for double-sided printed brochures or newspapers.

Zhengdu 3kai: 362×781 mm, suitable for multi-page brochures or book interiors.

Zhengdu 4kai: 370×540 mm (some say 353×500 mm), commonly used for regular books or magazine pages.

Zhengdu 6kai: 362×390 mm, suitable for making business cards or small promotional items.

Zhengdu 8kai: 260×370 mm, portable and easy to print, suitable for small brochures or notebooks.

Dadu (Large format) Paper Sizes:

Dadu Quankai: 844×1162 mm (some say 889×1194 mm), suitable for large printed materials such as promotional posters.

Dadu 2kai: 570×840 mm, suitable for double-sided printed brochures or newspapers.

Dadu 3kai: 387×844 mm, suitable for multi-page books or brochure interiors.

Dadu 4kai: 420×570 mm (some say 420×594 mm), commonly used for books or magazine pages.

Dadu 6kai: 387×422 mm, suitable for making small promotional items or business cards.

Dadu 8kai: 285×420 mm, portable and easy to print, suitable for small brochures or notebooks.

Dadu 16kai: 210×285 mm, widely used in various printed materials.

Dadu 32kai: 203×140 mm, commonly used for small printed items.

Additionally, there are international standard paper sizes such as the A series and B series:

A0: 841×1189 mm, commonly used for large promotional posters or engineering drawings.

A1: 594×841 mm, suitable for large brochures or newspapers.

A2: 420×594 mm, commonly used for books or magazine pages.

A3: 297×420 mm, widely used in various printed materials.

A4: 210×297 mm, the most commonly used standard paper size, suitable for regular books, magazines, and brochures.

A5: 148×210 mm, commonly used for small brochures or notebooks.

The B series paper sizes are similar to the A series but have a different aspect ratio and start with an area of √2 square meters (approximately 1.414 meters by 1 meter). Common B series paper sizes include B0, B1, B2, B3, B4, and B5, each suitable for different printing needs.

Units of Paper Measurement

Gram (g): Refers to the weight of one square meter of paper. The calculation formula is length multiplied by width divided by 2, with the result in grams.

Ream: A unit of quantity for paper. Typically, 500 sheets of paper are called a ream, which is the factory specification for paper.

Ton: Used to calculate paper prices. It converts the same as the usual kilogram unit, with 1 ton equal to 1000 kilograms.

Paper Specifications and Names

Common Paper Specifications:

Zhengdu paper: With dimensions of approximately 109.2 cm long (some say 108.6 cm) and 78.7 cm wide.

Dadu paper: With dimensions of approximately 119.4 cm long (some say 116.2 cm or 123 cm) and 88.9 cm wide.

Self-adhesive paper: With dimensions of 765 cm long and 535 cm wide.

Carbonless paper: Available in Zhengdu and Dadu specifications, but note the distinction between top, middle, and bottom sheets, which have different prices.

Common Names of Paper:

Copy paper: 17g Zhengdu specification, pure white, commonly used for VAT invoices and gift packaging.

Typewriting paper: 28g Zhengdu specification, available in seven colors, commonly used for carbonless copies and forms.

Glossy paper: 35-40g Zhengdu specification, with one glossy side, used for carbonless copies, forms, and notepads, belonging to low-grade printing paper.

Writing paper: 50-100g available in both Dadu and Zhengdu specifications, commonly used for low-grade printed materials.

Offset paper: 60-180g available in both Dadu and Zhengdu specifications, commonly used for mid-grade printed materials.

Carbonless paper: 40-150g available in both Dadu and Zhengdu specifications, with direct copying function, divided into top, middle, and bottom sheets with different prices, commonly used for carbonless copies and forms.

Art paper: Double-sided coated art paper ranges from 80-400g in both Dadu and Zhengdu specifications, used for high-grade printed materials; single-sided coated art paper is used for paper boxes, cartons, and other mid-to-high-grade printing.

Matt coated paper: 105-400g, used for elegant and high-grade color printing.

Grey-bottom whiteboard paper: 200g and above, with a white top and grey bottom, commonly used for packaging.

White cardboard: 200g, double-sided white, commonly used for mid-grade packaging.

Kraft paper: 60-200g, commonly used for packaging, cartons, and document bags.

Specialty paper: Mainly imported, commonly used for covers, decorations, and other high-grade printing.

In summary, paper sizes, units of measurement, specifications, and names play an important role in the fields of printing and design. Understanding these basics helps in better selecting suitable paper to produce high-quality printed materials.