Three-break fold

The three-break fold is a term used in print finishing.

When folding raw sheets, the paper fibers of the paper are broken in the running direction, which is why one speaks of breakage. If a folding sheet or a folding scheme is folded three times, it is called a three-fold fold . In this case, a 16-page folded sheet is created . In most cases, each fraction doubles the number of sides.

Types

The best-known type of three-fold fold is the double cross-fold or three-fold.

Cross break

After printing , the raw sheet is folded in a folding machine once in the longitudinal direction and then in the transverse direction. The paper fibers in the sheet are definitely broken once, regardless of the direction in which the paper is running , hence the term breakage. If you then unfold the sheet again, the two folds (breaks) of the folding scheme have the shape of a cross.

This type of folding turns the raw sheet into a folding sheet with 8 pages, a so-called quarter sheet . The eight pages must have been arranged on the printing form beforehand during imposition according to this folding scheme .

Triple fraction

In the case of a three-fold , the sheet is folded once in the longitudinal direction, then in the transverse direction (as with a cross-fold) and then once again in the longitudinal direction, creating a 16-page folded sheet . If you fold the sheet open again, the individual breaks result in the shape of crosses lying next to each other. This is why one speaks of a double cross break. Strictly speaking, however, the number of breaks in a folding scheme says nothing about the number of pages of the folded sheet, since you can also choose other sequences for the individual breaks, e.g. B. Parallel fold. Colloquially, however, the term three-fold stands for the 16-page folded sheet mentioned.