Back to results
US 3,946,548 AGranted
Bulky multifilament yarn and process for manufacturing the same
AssigneeTeijin Limited
InventorsHajime Hino, Yoshiyuki Sasaki, Yukimasa Fujisawa
Life of this patent
Estimating the term…
Loading patent…
Loading patent…
AssigneeTeijin Limited
InventorsHajime Hino, Yoshiyuki Sasaki, Yukimasa Fujisawa
Estimating the term…
A multifilament yarn of improved bulkiness is provided. The yarn is composed of two portions, i.e., a relatively dense portion and a blooming, relatively sparse portion, alternately occurring along the length of the yarn. The relatively dense portion is in a partially twisted state and individual filaments in this portion are irregularly entangled and cohere to a greater extent than in the relatively sparse portion. The relatively dense portion has protruding filament ends on the yarn surface in a larger number than the relative sparse portion. The yarn is prepared by first passing a multifilament yarn through a high velocity fluid jet nozzle and then subjecting it to a combination of the steps of false twisting and frictional contact.
A process for manufacturing a bulky, crimped thermoplastic polymer multifilament yarn, which comprises feeding a continuous multifilament yarn having a twist less than approximately 800 turns per meter to a high velocity fluid jet where a multitude of loops and arches are formed on the yarn surface and individual filaments are irregularly entangled with each other, and the subjecting the multifilament yarn to a combination of the steps of false twisting such that the whole multifilament yarn is false twisted, and of passing the multifilament yarn over a friction member thereby cutting at least some of the looped and arched filaments on the yarn surface to form filament ends.
Dependencies are inferred from the claim text.