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A concertina fold, also known as a zig-zag fold, accordion fold or z-fold, is a continuous parallel folding of brochures and similar printed material in an accordion-like fashion, that is with folds alternatively made to the front and back in zig-zag folds. Because they do not nest (as in Letter Folds) panels can be the same size.
Then, accordion fold the pattern, starting with angle α 2i + 1 and alternating between mountain and valley folds, placing each angular wedge of the paper below the previous folds. At each step until the final fold, an accordion fold of this type will never self-intersect.
The development of orihon began in China but later took on an association with Japanese books, as shown by its current name."The development of alternatives to the roll in China is difficult to date, but it appears that at some time during the Tang period long rolls consisting of sheets of paper pasted together began to be folded alternately one way and the other to produce an effect like a ...
A bi-fold brochure results in four panels (two panels on each side), while a tri-fold results in six panels (three panels on each side). [ 5 ] Other brochure fold arrangements are possible: the accordion or "z-fold" method, the "c-fold" method, etc. Larger sheets, such as those with detailed maps or expansive photo spreads, are folded into four ...
The accordion-fold books were easier to handle than bound scrolls while reading and reciting sutras. The advantage was that it was now possible to flip to a reference without unfolding the entire document. Woodblock prints also made the new format easier by allowing two mirror images to be easily replicated on a single sheet.
For strips too short to apply this method directly, one can first "accordion fold" the strip in its wide direction back and forth using an even number of folds. With two folds, for example, a 1 × 1 {\displaystyle 1\times 1} strip would become a 1 × 1 3 {\displaystyle 1\times {\tfrac {1}{3}}} folded strip whose cross section is in the shape of ...
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A squash fold starts with a flap with at least two layers (for example, one flap of a waterbomb base). Make a radial fold from the closed point down the center of this flap. Open the flap and refold downward to make two adjacent flaps. A rabbit ear fold starts with a reference crease down a diagonal.