Most common folding types
Let's see roll folds. Suppose we have the inner side of the folding brochure in sight.
The 4 panels on the right fold rolling inwards. The 2 leftmost panels (front and back cover) are the same size, and the 3 panels to the right are each of them 2 mm narrower than the preceding one, being all of them a few mm narrower than the front and back covers.
Now let's focus on concertina folds. In this type of folding, panels are accordion-like folded. All panels are the same width. So in a finished-size, 10x21 cm 5-panel brochure, open size is 50x21 cm, each panel measuring 10 cm.
In addition to these main types of folding (roll fold and concertina fold), we can also offer another type, which we will call roll fold + bifold: Let's see the folded brochure's inner side. We fold the 3 rightmost panels as in a trifold. Then, we do not roll this "momentary" trifold inwards, as we would do in a conventional 5-panel roll fold, but rather fold it outwards. Finally, we fold the 2 panels on the left as a bifold.