Over the years, many shapes have been proposed for tower packing, but only a few are widely used. Probably the oldest type of random dumping tower packing is commercial in the form of La Xi ring. It is a simple packing with equal external diameter and height. It is made of ceramics, metals, plastics and carbon. The two modification of this shape is in the Lessing ring and diaphragm ring. These two shapes use internal partitions. These fillers have been installed in both dumping and stacking.
A further modification of the basic cylindrical shape involves the helix installed in the cylinder. The inner part of this ring can contain single, double, or three helices. The spiral ring packing is usually made of ceramic and should be installed only by stacking. The first modern dumping packaging was developed by Baer saddle ring in the late 1930s. This shape has a significantly increased surface area compared to the unit of each packaging volume. Another improved shape is the saddle ring developed in early 50s. This design has two different radii that provide randomness in the greater degree of curvature of the packed bed. In the early 50s, a significant improvement was made in the BASF's rash ring shape. Their development, known as the Ball Ring, includes cylinders of equal length and diameter and punched with ten fingers extending from the cylinder wall to the inside of the packing element. Although the Bauer ring has the same geometric surface area as the Lacy ring, the inner surface of the Bauer ring is closer to the gas and due to the opening of the liquid through the wall. Subsequent Bauer ring modifications, such as Hylan Packing, have further increased the percentage of inner surface area of the packing element so that it can be used for gas and liquid contact. Further modification of the Bauer ring was developed by mass transfer limited. The cascade donation ring is still pierced from the wall into the ring with a finger cylinder; however, the cylinder is only a third of the outer diameter. This shape means that when poured into a packed bed, the position itself is first selected. The new filler element combines the advantages of the shape of the saddle ring to the modern ring packing. This saddle metal tower packing, or IMTP packaging (trademark Norton chemical process products), was developed by Norton in the late 1970s and manufactured exclusively from metals.
The shape of filamentous packaging was developed by Dr. A. J. in 1950s. This Tellerette is only in plastic production. In order to meet the requirements of a very low pressure drop for packaging contamination control applications, a snowflake packaging with moment saddle was developed. Since 1987, this unique shape has provided uniform, interstitial liquid droplets with the largest number of the plastic packaging available. This characteristic makes the surface of the liquid greatly improve the efficiency of its mass transfer. This packaging has been found for use in humidification, dehumidification, absorption, scrubbers and striptease as it is still developing, which is a rough history of random packaging.