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The dimensions of the A-series paper are defined by the ISO 216 international paper size standard. This standard was adopted in Europe during the 19th century and is now used globally, except in the United States and Canada. The most commonly used size in English-speaking countries is A4, measuring 210 mm × 297 mm (8.27 inches × 11.7 inches). The largest size in the series, A0, has an area of 1 square meter, with dimensions of 841 mm × 1189 mm. The A-series employs an aspect ratio of 1:√2, ensuring that each size can be halved by folding parallel to its shorter side to produce the next smaller size (e.g., cutting an A4 sheet in half yields two A5 sheets). This feature allows larger sheets, such as A3, to be easily folded into smaller formats like A4 for brochures. All dimensions in the A-series are rounded to the nearest millimeter for standardization.

Offset Printing Principle: ① Utilizing the principle of water and oil not mixing: The image and text areas of the printing plate are oleophilic (attract ink) and hydrophobic (repel water), while the blank areas are hydrophilic (attract water) and ole...

Printing Basic Process: Pre-press: Photography, design or creation, typesetting, film outputting, plate burning, etc. During Printing: Transferring the content on the printing plate to the substrate through printing machinery and specialized inks to ...

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 n...