Each binding style has its own distinct hole pattern, which only works with the spines that correspond to that specific binding method. In this post, we’ll take a closer at each of the punch patterns to help you distinguish between each of the styles.
There are two separate punch patterns used for wire binding, 2:1 (two holes per inch) and 3:1 (three holes per inch). The 2:1 pattern uses slightly elongated, rectangular holes, and has a total of 21 holes per 11″ sheet. The 3:1 wire binding pattern uses square holes, and has a total of 32 holes per 11″ sheet. Unless your wire binding machine is dual-function or modular (which would allow you to change out your punching dies), it will only punch one of the two pitches. Being aware of which punch pattern your wire binder is capable of producing will ensure that you purchase the twin-loop binding wires that match.
Coil binding ultilizes only one punch pattern – a 4:1 (four holes per inch) pattern made up of 4mm circular holes. Standard plastic binding coils are available in 12″ lengths with a total of 48 loops, which allows you to create crimped ends when binding your 11″ document. Some coil binding machines also offer oval holes instead of circular holes, which makes the pages of the document turn more easily with less resistance from the coil itself. (Note: The 4:1 pitch pattern is the most common coil binding pattern in the United States and Europe, but other some other countries, including Canada, use a 5:1 pitch when binding with coils).
The comb binding pattern is made up of 19 rectangular holes per 11″ sheet. These rectangles correspond to the 19 prongs present on comb binding spines. Each rectangle measures 8mm x 3mm, which provides extra room to turn the pages when the binding comb is inserted.
VeloBind (also called hot knife binding or strip binding) has an 11-hole punch pattern that consists of 1/8″ circular holes, and is designed to work with 11-pin VeloBind strips. There are also four- and six-pin styles, but those are far less common than the traditional 11-hole pattern. The four-pin VeloBind spines can be used in conjunction with the 11-hole punch pattern or the actual four-pin pattern, but the six-hole hot knife strip only works with a specific binding machine model from GBC (which has been discontinued).