Abstract: An improved sheet folding method comprises forming an upper folding template and a lower folding template having plate elements corresponding to predetermined fold configurations desired to be formed, the plate elements being interconnected along respective joining lines between adjacent plates by thin, flexible joining parts which allow the plate elements to be folded together along the joining lines, placing a sheet to be folded between the upper and lower folding templates, then folding the stacked sheet and templates together according to the order of the fold configurations desired, whereby the desired fold lines are formed in the sheet corresponding to the joining lines between the plate elements in the order of the fold configurations.

Abstract: An improved sheet folding method comprises forming an upper folding template and a lower folding template having plate elements corresponding to predetermined fold configurations desired to be formed, the plate elements being interconnected along respective joining lines between adjacent plates by thin, flexible joining parts which allow the plate elements to be folded together along the joining lines, placing a sheet to be folded between the upper and lower folding templates, then folding the stacked sheet and templates together according to the order of the fold configurations desired, whereby the desired fold lines are formed in the sheet corresponding to the joining lines betwen the plate elements in the order of the fold configurations.

Abstract: In conjunction with folding a sheet with center cross folds offset from the diagonals of the sheet, upper and lower lateral folds, a central vertical reverse fold, a pair of vertical side folds defining an inner pleat and a pair of outer pleats, and at the ends of each outer pleat an outer lateral reverse fold and a vertical fold, an improved sheet folding method uses a pair of tuck folds to fold the outer ends under the outer pleats. The tuck folds allow the sheet to return automatically to its folded state which is smaller than a conventional folded sheet.