Yongjin kub muag ceev ceev elastic ntaub tiaj tus ua tshuab, tshuab rau weaving tiaj tus elastic band yog ua tib zoo tshawb fawb thiab tsim los ntawm pab pawg R & D, thiab qhov chaw yog meej heev, uas yog los daws cov teeb meem mob ntawm cov neeg siv khoom thiab ua tau raws li qhov xav tau ntawm cov neeg siv khoom. Yog li ntawd, cov ntaub ntawv ntsuas qhia tau hais tias cov khoom ua tau raws li qhov xav tau ntawm kev ua lag luam.
Cov thev naus laus zis tuaj yeem ua kom peb cov txheej txheem tsim khoom raug ua kom yooj yim thiab txhim kho dua tshiab, uas txuag tau ntau lub sijhawm thiab lub zog rau peb. Nws qhov kev pab them nqi ntawm daim ntawv thov tau nthuav dav mus rau thaj chaw (s) ntawm YJ-NF 2/130.