Roj hmab tau muab faib ua cov roj hmab ntuj thiab hluavtaws roj hmab raws li cov khoom siv raw. Cov hlau los tiv thaiv cov ntaub midsole muab faib ua ib qho thaiv ntawm cov roj hmab nyoos, latex, kua roj hmab thiab hmoov roj hmab raws li daim ntawv. Latex yog ib qho colloidal aqueous dispersion ntawm roj hmab; kua roj hmab yog cov roj hmab oligomer, uas feem ntau yog cov kua nplaum ua ntej ua vulcanized; hmoov roj hmab tau ua tiav rau hauv cov hmoov los pab txhawb kev tsim thiab ua tiav.
Kev tsim kho ntawm ib leeg yog qhov nyuaj heev thiab tuaj yeem suav nrog, hauv kev nkag siab dav, tag nrho cov ntaub ntawv uas ua rau hauv qab, midsole thiab pob taws. Hauv kev nkag siab nqaim, nws tsuas yog hais txog lub outsole. Feem ntau, cov yam ntxwv ntawm cov khoom siv ib leeg yuav tsum hnav-tiv taus, dej-tiv taus, roj-resistant, kub-resistant, siab-resistant, cuam tshuam-resistant, elastic, yooj yim haum, thiab tsis yooj yim rau hloov tom qab molding. Nws absorbs noo noo thiab lwm yam. Nyob rau tib lub sijhawm, nws yuav tsum ua kom haum rau midsole. Thaum taug kev thiab hloov ob txhais taw, muaj cov brakes uas tsis ua rau kev swb thiab yooj yim nres. Muaj ntau ntau yam khoom siv rau lub hauv paus, uas tuaj yeem muab faib ua cov khoom siv hauv ntuj thiab cov khoom siv hluavtaws. Cov ntaub ntawv hauv qab ntuj muaj xws li cov tawv hauv qab ntuj, xyoob, ntoo, thiab lwm yam. Cov khoom siv hluavtaws muaj xws li roj hmab, yas, roj hmab thiab cov ntaub ntawv yas, tawv tawv, thiab cov ntaub ntawv elastic.
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