Perforated sheets

This perforation is of rare application. Therefore the drillers have few standard equipment of this type

This arrangement (also called quincunx) is the most common because it combines a high rigidity of the plate with a fair ratio of full vacuum. It is therefore considered normal and, unless specified otherwise, the perforation is performed like this

The holes are arranged in parallel rows. This arrangement is required for exhibitor panels, shop fittings and, sometimes, as ornamental perforation (radio facades and the like), it is nevertheless widespread