Nonwoven fabrics have a long history. Even nature has examples of nonwoven fabrics: silk cocoons and spider webs, for example. Sumerians have been described as creating felt using wool as early as 4000 BC. The modern nonwovens industry, however, arose in the 1920s and 1930s. In 1938, artificial leather was created and sold for the first time. 1942 saw the introduction of the term “nonwoven fabric” and its wide use across the industry. By 1947, disposable diapers had been produced using nonwoven technology.