leporello

A leporello is a strip of paper folded back on itself in a zigzag or concertina pattern, so that it opens sequentially without separating into individual pages. Each fold runs perpendicular to the previous one, allowing the entire piece to expand to full length when pulled apart. The name comes from a character in Mozart's opera who keeps a list that unfolds endlessly, and printers adopted it to describe this characteristic accordion-like opening motion.

In production, a leporello starts as a single continuous sheet. Folds are scored (creased with light pressure) rather than fully cut, so the paper remains connected along the spine. The number of folds determines how many panels appear when fully extended; a sheet with four folds creates five panels. Scoring is done on a platen press or dedicated folding equipment, and the fold pattern must be precise to ensure even panels that align properly when opened and closed.

Leporellos appear in several industrial contexts. Tourist brochures, instruction manuals, maps, and product catalogs commonly use this format because the folds allow large content areas to fit in a small mailing or pocket size. The format also prevents loose pages; there is no binding to fail and no separate sheets to lose. Each panel typically carries related information or sequential steps, making the format logical for guides and fold-out references.

Materials and specifications

The paper weight matters considerably. Lightweight stock (80 to 100 gsm) folds easily but may feel fragile; heavier stocks (150 to 200 gsm) resist creasing and are more durable but demand sharper fold equipment and more pressure to crease cleanly. The direction of grain (parallel to the fold or perpendicular to it) affects how easily the paper creases and whether the folds stay flat. Coated stocks print crisply but can crack if the fold depth is not dialed precisely.

Common problems in production include uneven fold spacing, which causes panels to misalign when the piece is opened fully, and incomplete scoring that results in the paper tearing during folding instead of creasing cleanly. If the folds are scored too deeply, the paper loses rigidity and sags. If scored too lightly, it will not crease properly on the final fold. The direction in which the paper is fed through the scoring station must match the fold pattern, and press operators must account for paper spring-back after scoring.

The leporello remains popular because it is economical to produce on existing equipment, requires no additional binding hardware, and creates a branded object that opens with a satisfying motion that customers remember. It sits between a simple folded brochure and a bound booklet in terms of production complexity and perceived value.