filmutforming
Filmutforming is the process of producing continuous filaments from polymers or other materials by forcing the material through a fine orifice, typically a spinneret, and then solidifying and orienting the extruded strand to achieve the desired strength and stiffness. The term is used in textile fiber production and in engineering fiber manufacturing, where long, continuous fibers replace short fibers.
- Melt spinning: a polymer melt is extruded through a spinneret into a quenching medium or cool
- Dry spinning: a polymer solution is extruded and the solvent evaporates to form filaments.
- Wet spinning: a polymer solution is extruded into a coagulating bath, where the polymer solidifies into
- Electrospinning: a polymer solution or melt is drawn into ultrafine fibers under a high-voltage electric field,
- Feedstocks include nylon (polyamides), polyester (PET), polypropylene, rayon, acrylics, and other synthetic or regenerated polymers.
- Filament diameters range from micrometers to tens of micrometers.
- Drawing and heat treatment orient polymer chains, increasing tensile strength and modulus while affecting elongation and
- Textiles and apparel, industrial cords, fishing lines, and medical sutures.
- Reinforcement in fiber-reinforced composites.
- Production of specialty filaments for additive manufacturing and other engineering uses.