|There are many variants of the ZetixTM fabrics - here, a woven sample can be seen unstretched (left image) & stretched (right image).
Notice that as the sample in the above images has been stretched (in the vertical direction), its structure opens up. In the case of filtration fabrics, for instance, this feature can be exploited to
create controllable pore sizes, meaning that specific particle sizes can be effectively targeted. It also means that as the filters get blocked, the desired pore size can be regained simply by stretching the fabric.
In the case of blast-protection fabrics, the pores allow high energy blast waves to vent through the material, significantly reducing the loads imposed on the fixtures.
While this is happening, the spiral windings (which are made of high-strength fibres) catch any ballistic fragments, reducing injuries and thus potentially saving lives.
A further benefit is that because the system is elastic, it returns to its original position once the blast wave has passed, therefore providing continued protection.