Roj hmab elasticity, tsis muaj cov cuab yeej plasticity tsim nyog ua thiab yog vim li no tsis yooj yim rau ntaub ntawv. Thiaj li yuav zoo qhov plasticity, cia li roj hmab-yas, kom cov khoom xyaw rau qhov nws yuav yooj yim rau hauv roj hmab, disperse thaum dov, txaus siab nyob rau hauv tus txheej txheem yog ib yam zoo kom allergic rau lub fibres npuag thiab liquidity. Degradation roj hmab los ntev saw molecules txoj kev taug txoj cai ntawm plasticity hu ua plasticating. Roj hmab yas nws txoj kev ntawm cov neeg kho tshuab softening thiab thermoplastic chain ob tug. Softening txhua yam tsis dhau kev kub muaj peevxwm mus txog tej yas zeb machinery extrusion thiab txhuam ua luv luv ntev roj hmab molecules tsi zoo los ntawm lub xeev elastic rau hauv ib lub xeev yas. Thermoplastic yog siv ib cov roj hmab nws kub compressed cua kub nyob ib puag ncig thiab cov pa ua txoj saw molecules thuam luv mus nce plasticity.
