trilobal

Trilobal refers to a filament cross-section in synthetic fibers characterized by three lobes arranged around a central axis. The shape, resembling a three-leaf clover when cut perpendicular to the filament, is produced by spinnerets with three-lobed orifices during melt spinning or solution spinning.

Common polymers used for trilobal fibers include nylon (polyamide), polyester, and acrylic, which are formed into filaments or staple fibers. The trilobal geometry increases surface area compared with round cross-sections, enabling enhanced moisture wicking, dye uptake, and tactile softness. It also alters optical properties, often producing varied luster depending on orientation and finish.

Applications for trilobal fibers span apparel, carpeting, upholstery, activewear, and nonwoven products such as wipes, filters, and absorbent cores. They are chosen for expectations of improved dyeability, bulk, texture, and moisture management, as well as for distinctive visual or tactile effects.

Advantages of trilobal fibers include higher surface area leading to improved wicking, dye uptake, and softness, along with the potential for increased bulk and a particular sheen. Limitations can include higher production costs, more complex spinnerets and processing requirements, and variability in luster or texture with fiber orientation and finishing.

Variants and related cross-sections: trilobal is one example among non-round fiber geometries; multilobal designs with four or more lobes are also used in certain fibers to tailor performance and aesthetics for specific end uses.