Letter Fold (6 Panels)

Definition: The folds in paper with parallel folds all run in the same direction, parallel to each other. Parallel folds are commonly used for all kinds of brochures (such as tri-fold), stationery inserted into business envelopes, and other materials. The specific direction of each of the parallel folds determines the type of folding pattern such as accordian or gatefold.

Examples: Accordian, Zig Zag, and Gatefold are types of paper folds that are all parallel folds.

Z-Fold (6 Panels)

Definition: In c folds there are 6 panels with two parallel folds in a spiral fold configuration. This is a common type of fold for tri-fold brochures. To allow the panels to nest inside each other properly, the folded in end panel is usually 1/32" to 1/8" narrower than the other panels.

Also Known As: business letter, letter fold, tri-fold, brochure fold, spiral fold

Middle Fold (4 Panels)

Definition: a single fold in the center of the flat size sheet.