Cov menyuam uas muaj qhov kub thiab txias ntawm lub zeb qhib muaj qhov cuam tshuam tseem ceeb ntawm cov roj hmab sib xyaw.
Yog tias cov menyuam cov menyuam kub siab dhau lawm, yuav muaj ntau yam kev sib raug zoo. Ib qho yog ua rau lub hlawv cov roj hmab, uas yog, thaum ntxov vulcanization ntawm roj hmab hauv kev sib xyaw theem. Qhov no yuav ua rau lub fluidity ntawm cov roj hmab phem dua, txuas ntxiv ua xws li extrusion, calender thiab lwm yam kev ua haujlwm me me kom ua. Qhov thib ob yog rau ntau dhau tsoo cov roj hmab molecular, txo cov khoom siv lub cev, xws li lub zog, elasticity, tensile cov khoom, thiab lwm yam. Piv txwv li, thaum ua log tsheb, cov coj tsis kam thiab nkees tsis kam ntawm cov log tsheb yuav raug txo kom tsawg.
Yog tias cov menyuam uas muaj dej kub tsawg dhau, cov yas ntawm cov roj hmab yuav yog neeg pluag. Qhov no ua rau nws nyuaj rau tus neeg sawv cev sib xyaw rau disperse tusyees hauv cov roj hmab, thiab nws yooj yim rau cov neeg sawv cev sib xyaw rau pawg. Ntxiv mus, lub viscosity ntawm cov roj hmab nce ntawm tsawg kub, thiab ntau dua shear zog yog yuav tsum tau thaum sib xyaw, tab sis kuj txuas lub sijhawm sib xyaw thiab txo qis kev ua haujlwm tau zoo. Piv txwv li, hauv kev tsim cov roj hmab ntsaws ruaj ruaj, qhov ntsuas kub yog qis dhau yuav ua rau kev sib khi ua tau zoo ntawm cov ntsaws ruaj ruaj.
