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Development trend of spunbond technology-composite products and bicomponent fibers
The bicomponent spunbond technology has made great progress. It is a nonwoven fabric production technology that combines the fiber-forming technology of composite spinning with the web-forming and cloth-forming technology of spunbond. The biggest advantage is that different materials can be used to produce products with different properties through different compound forms. After the heat treatment of the PE / PET skin-core composite product Elves of Japan Uniqa Corporation, the polyethylene on the surface melts into a binder and a coating, and the polyester of the core layer is not affected in any way. Freudenberg uses two different PA / PET composite fibers, Evolon, to process into ultra-fine composite spunbond nonwoven fabrics , with good product quality, good appearance quality, and stable dimensions. Neumag uses the technology of American company Ason to process PP / PE skin-core two-component composite spunbond nonwoven fabrics . The product has a soft hand feel and good performance. One of the new developments in spunbond production methods is the use of bicomponent spinning, with sheath-core fibers being the most common. The outer layer of the sheath-core filaments spun is a low-melting polymer. Typical sheath-core products are mainly PE / PP, PP / PET, PE / PET, CoPET / PET, etc. The split fiber is split type with a fiber fineness of 0.1d. Using bicomponent fiber, the production speed is increased, the cost can be reduced, and the product strength is high. Bicomponent filaments are composed of two different polymers, and the most commonly used structural forms are sheath-core, side-by-side, and peel-off. The sheath-core bicomponent fiber generally refers to a single core, which can be divided into a concentric core type and an eccentric core type. The side-by-side type is formed by using two polymers with different thermal shrinkage properties after heat treatment. Peeling bicomponent fiber is a common method for producing ultra-fine fibers. It uses two non-adhesive polymers to spin into a single fiber in a certain combination. The components in the cross section are distributed in different shapes, and then the physical or chemical stripping method is used to separate the combinations of the fibers from each other. Reifenhauser in Germany, Akzo in the Netherlands, Nordson in the United States (has been merged by Neumag Newmag), Ason in the United States (has been merged by Neumag Newmag), Hill in the United States ( Hills) provides bicomponent spunbond technology.