We mostly print PP woven bags in gravure printing and thus off the roll. Because of this, we put the short sides on one common side for printing. Graphic designers are not used to seeing this, but it corresponds to the printing reality.
After printing, the short sides are cut off.
To save material and costs.
Imagine if we had already distributed the two short sides to the left and right in the print, the roll would have to be wider by exactly the width of a short side because of this.
That doesn't sound too bad, but we suddenly conjure up unprinted areas on the roll. Because we would have, corresponding to the two short sides, also distributed two dark sides on the roll / printing surface, which simply remain unprinted and have to be thrown away. Typical blend. Every printer tries to avoid this as much as possible.
In order not to have this, we lay the short sides snugly on the front and back on a single side and not on the left and right and thus on two sides. This saves us the superfluous material on both sides.
Quite simply, we don't just have the front. We have a three-dimensional body that we want to build. There is also a reverse side! A promotional bag is also a business card in a broader sense, but unlike the business card, it is a three-dimensional body.
So if we had created 4 pages, we would already distribute the short pages to the left and right during printing.
But since we only need 2 short pages, 2 would then be superfluous. It is precisely these superfluous parts that we avoid in print if we put the short sides all on one side for printing. One short side leaning against the front, one short side leaning against the back. But both filed on one side of the web.
After the cut in the sewing process, each side moves, one to the left, one to the right, each in its own position.
The square/rectangle between the short sides is excess material.
The edging tape runs long along the edges of the short sides and thus also along the corresponding sides of the front and back. This grips 1 cm each on the short sides and in the front and back sides. But only along the short sides. The transverse edges of the front as well as the back have no binding.
The data should be created in such a way that the image motifs are continued - even if the binding conceals this. This is to avoid so-called speed cameras!
Please note the cross seam at the top that holds the edge fold. Seams also appear on the outside. If possible, please display motifs in the seam area that do not represent faces, for example, through which the seam would otherwise run.