B1 paper is a popular size that falls under the B series paper sizes defined in ISO 216. B1 paper measures 707 x 1000 mm or 27.8 x 39.4 inches. This size is slightly smaller than A0 paper but larger than A1 paper, and is commonly used for printing posters, banners, and other large format prints. The B series paper sizes were created to provide paper sizes that were not covered by the A series, but still maintained the same aspect ratio of 1:root2.
B1 paper is a versatile size that is suitable for a wide range of printing needs. It is often used for printing large posters, wall charts, and artwork, as well as for technical drawings and schematics. The geometric mean between B1 and A1 paper is A0 paper, which makes it easy to enlarge or reduce prints between these sizes without losing aspect ratio.
One advantage of using B1 paper over A1 paper is that B1 paper is slightly wider, making it more suitable for certain types of prints. Additionally, B1 paper is often available in a wider range of weights and finishes than A1 paper, making it more customizable for specific printing needs. B1 paper is also less common than A1 paper, which can make prints on B1 paper stand out and draw more attention.
Overall, B1 paper is a great choice for large format printing needs that require a paper size between A1 and A0. Its versatility, aspect ratio, and availability in a wide range of weights and finishes make it a popular choice among graphic designers, artists, and printers.