Composition and classification of sea island fibers

    Sea island fiber refers to the dispersion of one polymer into another polymer, with the dispersed phase in an" island "state in the fiber cross-section, while the parent body is equivalent to" sea ", and its" island "and" sea "components are continuous, dense, and uniformly distributed in the axial direction of the fiber.". In the production process, it has the size of a conventional fiber, but by dissolving the "sea" component with a solvent, a cluster shaped superfine fiber bundle can be obtained.

Composition of sea island fibers

    Sea island type fiber is a composite fiber obtained by combining or co blending two thermodynamically incompatible polymers in a certain proportion. One component is a dispersed phase (island component), and the other is a continuous phase (sea component). The two component polymers of sea and island form a large number of island sea structures, which are then uniformly collected. Therefore, the formation of numerous fine island sea structures and their uniform collection are the key to the design of spinning components. The island component is contained in the sea component in the form of extremely fine fibers, with a cross-section distributed in an island shape, and its long axis parallel to the composite fiber.

    Dissolve the marine phase of the island fibers, leaving a bundle of ultrafine fibers with a fineness of 0.01 to 0.2 deniers. If the island phase is removed, it can be made into porous hollow fibers with a honeycomb structure.

Classification of sea island fibers

    There are two types of sea island fibers: filament and staple. Filament is a regular continuous distribution of fibrils in the matrix, mainly produced by direct spinning and composite spinning methods. After cutting the filament, various lengths of staple fibers can also be produced; Short fibers are fibrils distributed discontinuously in the matrix, but their main axes coincide with the fiber axes.

    According to the different distribution rules of islands, they can be divided into fixed islands and indefinite islands. The distribution of fixed island type fiber islands is uniform and fixed, and composite spinning is generally used; In the latter case, the islands are not fixed and uneven, with significant differences in thickness.