sheath-core bi-tivthaiv fiber ntau, yog ib hom tshuaj fiber ntau rau cov ntaub ua tsoos ntaub, dav siv rau cov khaub ncaws hnav.Qhov zoo uas yuav tsum tau ua rau spinneret yuav siab dua qhov uas siv rau cov tsis-woven ntaub.the sheath-core hom spinneret peb tsim tau txais cov tswv yim zoo los ntawm kev ua lag luam, thiab tau muag rau cov teb chaws Esxias sab qab teb sab hnub tuaj.