Sea-island fiber, also known as super conjugate fiber, matrix fibril type fiber, is a core component composed of a polymer material (also known as “island” phase) dispersed in another in a longitudinally continuous form It is formed in the sea component (also called “sea” phase) composed of polymer materials.

The cross-section of the fiber is island state, so it is called sea-island fiber.

After treated with organic solutions, the sea component will be dissolved, and the short-fiber ultrafine fiber of the island component can be obtained.