Double Loop Wire Binding

Double loop wire binding consists of a series of double wire loops from a continuous pre-formed wire, which are inserted into pages that have been punched with square or round holes. The loops of the wire are held opened by a machine to allow the pages to be inserted over the loops. Once the loops are closed, extra pages cannot be added. Double loop wire binding is more expensive than plastic combs or spiral binding, but it is more attractive and long lasting. When books with this type of binding are open, the pages will lie flat and the pages can be folded over completely. Double loop wire works best for books of one-inch thickness or less. Many technical manuals and cookbooks have this type of binding and they are very popular among architects. Double loop wire binding is also known as "Wire-O-Binding", which is a brand name for this type of binding. Listed below are the types of wire available.

• 3:1 Wire - With this wire, the paper is punched 3 holes per inch, which is 32 holes per standard 11" sheet size. It is available in sizes ranging from 3/16" up to 9/16" in diameter. It has the best appearance of all double loop wire.
• 2:1 Wire - Pages are punched with 2 holes per inch or 21 holes per standard 11" sheet size. 2:1 wire is used for binding books that are too large for 3:1 wire and is available in sizes ranging from 5/8" to 1". The wire is more durable and sturdy than 3:1 wire.
• 19 Loop - The pages are punched with 19 rectangular holes per standard 11" sheet size and the wire comes in diameters ranging from 1/4" to 1". The wire is similar in appearance to 2:1 wire.

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