The origami pleat-fold is a parallel and evenly-spaced valley-fold and mountain-fold in alternate directions.
It is also known as an accordion-fold or stair-step fold.
To make origami pleat-fold, valley-fold in one direction, then leave space. Then again make the mountain-fold parallel to the first, but in the opposite direction. Repeat the steps till required. Mostly, the folds are evenly spaced.
Example of pleat-fold folded diagonally
Example of pleat-fold folded horizontally
When unfolded the folds show evenly spaced valley-fold and mountain-fold.
