초록 ▼

Side-by-side conjugate filaments made from thermoplastic elastomers and spunbond-type polyolefins exhibit an extremely high propensity to self-crimp. At appropriate polymer ratios and processing conditions (with mechanical or aerodynamical drawing) the crimp develops spontaneously after relaxation o

Side-by-side conjugate filaments made from thermoplastic elastomers and spunbond-type polyolefins exhibit an extremely high propensity to self-crimp. At appropriate polymer ratios and processing conditions (with mechanical or aerodynamical drawing) the crimp develops spontaneously after relaxation of the attenuation force. The amount of crimp and the degree of elastic properties depend on the elastomer content and the processing conditions. The resulting crimp is typically in the range of 25-200 crimps per inch. This combination of exceptionally high crimp and an elastomer component imparts stretch and recovery properties. The filaments can be wrapped around a cylindrical supporting structure to create a continuous, seamless elastic band, useful for body-fit articles.

대표청구항 ▼

[ What is claimed is:] [1.] A method of making a seamless tubular band comprising:extruding first molten polymeric components and second molten polymeric components and forming molten multicomponent filaments wherein the first and second components are substantially consistently positioned in distin

[ What is claimed is:] [1.] A method of making a seamless tubular band comprising:extruding first molten polymeric components and second molten polymeric components and forming molten multicomponent filaments wherein the first and second components are substantially consistently positioned in distinct zones across the cross-section of the molten multicomponent filament, said first component comprising a polyolefin and said second polymeric component comprising a non-urethane elastomeric block copolymer;attenuating the molten multicomponent filaments by applying an attenuating force to the molten multicomponent filaments as they solidify;wrapping said filaments around a support structure to form a seamless tubular band while maintaining the attenuating force; and thenremoving said tubular band from said support structure and releasing said attenuating force wherein solidified multicomponent filaments contract and self-crimp.