Lub hnab tuj yog ib hom ntim uas feem ntau siv hauv kev lag luam tsheb thauj mus los, thiab nws kuj yog qhov kev xaiv ntawm lub hnab ntim rau ntau yam khoom. Cov txheej txheem tsim khoom ntawm lub hnab ntim khoom yog cumbersome heev, thiab nws tuaj yeem siv tau zoo dua los xyuas kom meej tias cov khoom siv sab hauv thiab sab nraud yog raws li tus qauv. Txawm li cas los xij, kuj tseem muaj qhov xwm txheej ntawm qhov chaw ntawm lub hnab ntim khoom tsis sib xws, thiab yog vim li cas rau qhov tsis sib xws ntawm lub hnab ntim khoom yog tsim.
Qhov tsis sib xws ntawm lub hnab loj yog feem ntau tshwm sim los ntawm qhov tsis sib xws ntawm cov xov paj warp thiab weft yarns. Qhov tsis sib xws ntawm warp thiab weft yarns yuav ua rau qhov tsis sib xws ntawm lub hnab woven. Muaj ntau cov kauj ruam nyob rau hauv warp tension adjustment. Lub warp creel yog qhov chaw yug ntawm qhov tsis sib haum xeeb warp nro. Yog hais tias lub tiaj tus hlau yog qhov txhab ntawm lub ncej, qhov kev sib hloov torque yuav tsis sib npaug, ua rau tsis sib xws.