In order to meet new requirements and new application areas, finer fibres will be produced and processes for the production of filter media will be combined. There is a trend towards the application of finer fibres for filter applications, which will help in the filtration of finer particles. Depending upon the different process combinations, fine particles with a size less than one µm can be filtered out. In order achieve this, filters are formed from very fine fibres. These fine fibres can be produced using different processes. Fibres such as bi-component fibres, which have a higher number of island fibres can be formed. With this island-in-the-sea technology, the segmented pie technology also helps in producing fine fibres and has become more popular in recent years.