Because rotary drum machines are versatile and accommodate a wide range of fabric types and chemical processes, they are used for a variety of wet processes. These machines consist of an outer containment cylinder, and an inner perforated drum or basket that rotates within the outer cylinder. An access door, usually located on the side of the outer cylinder, allows access to the perforated drum. The key advantages of rotary drum machines are that they require relatively little water to operate and have computer controls, add tanks, and extraction capabilities.
Once wet processing is complete, the garments go through an extraction process to remove excess water, which minimizes drying time and energy use. Modern rotary machines have excellent extraction capabilities, but older rotary machines and belly washers require a separate extraction in a machine designed specifically for that purpose.
Once the excess water has been removed, the next step is to tumble dry the garments. The design of modern dryers allows for rapid loading and unloading. In addition to drying, these machines are used to soften and pre-shrink the garments.
Garments may be pressed at various stages of the denim finishing process. For example, jeans are often pressed to provide a smooth surface for the application of whiskers. Creases or pleats may be pressed into a garment for a vintage look, or jeans may be pressed before curing, for a dressier look. Finally, jeans are pressed before shipment to retail.