Naike - Fenske Spiral

The Fenske spiral prismatic packing is made of wire and has a shape similar to that of a spring, also known as a triangular spring Packing. Its differences from a spring in that each turn of the winding is not a circle but a triangular, and the triangular between the ring and the ring is offset by a certain angle, so that it is a polygon when viewed from the end face. This spiral packing is more efficient, but has a slightly higher resistance than the annular packing and is widely used in laboratory-scale isotope separation studies.