In our daily work, we often use copy paper or printing paper. There are various **copy paper specifications** that we come across. The most familiar one is the A4 **copy paper specification**, which is widely used for documents and electronic files. However, beyond A4, there are several other common **copy paper specifications** that we may encounter in everyday life.
So, what exactly defines a **copy paper specification**? Simply put, it refers to the size of the paper—its length and width. In casual conversation, people might say "what size paper" to refer to the **paper specification**. Based on different formats, paper sizes are mainly divided into three series: A, B, and C. Most **copy paper specifications** fall under the A and B series, while the C series is less commonly used. In China, there's also a K series, which is unique to the local market.
The A and B series follow a specific ratio, where each subsequent size is half of the previous one. For example, A3 is twice the size of A4, and similarly, B3 is twice the size of B4. The K series works differently, with 1K being equal to two 2K sheets.
Now, let’s look at some of the **common copy paper specifications**. The standard unit for measuring paper size is millimeters (mm). The A series starts with A0, which measures 841mm in width and 1189mm in length. Commonly used sizes include A4 (210mm x 297mm), A3 (297mm x 420mm), A5 (148mm x 210mm), and A6 (105mm x 148mm).
The B series has slightly larger dimensions. The base size is 1000mm x 1414mm. Popular sizes in this series include B4 (250mm x 353mm), B5 (176mm x 250mm), and B6 (125mm x 176mm).
Different **copy paper specifications** are suited for different purposes. When choosing copy paper, it's not just about the size—it's also important to consider factors like thickness, weight, and brightness. These elements can affect print quality and machine performance. Low-quality paper may cause issues such as smudging, jamming, or excessive dust, leading to more maintenance and cleaning. Therefore, selecting the right **copy paper specification** along with the appropriate quality is essential for efficient and high-quality copying.
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