Cov roj teeb tsis muaj kab ncaum, uas kuj zoo li hu ua ob qhov roj teeb, yog qhov chaw tsim tshuaj siv polymer txhim kho tshuaj siv los tshem tsov cov khoom siv volatiles, dej, lossis du dej hauv yam ntxwv. Cov chaw no muaj lub thawj kab ncaum uas muaj ob qhov sib txawv uas muaj qhov tawm sab nraud uas siv lub tshuab tso dej. Lub thawj qhov ua phau polymer ib yam nkaus—ntsuas, nyiag, thiab siv—tom qab ntawd thawj tso cua sov mus rau qhov chaw tso dej uas muaj cua sov tawm. Lub qhov rooj nyiag dua tom qab no yuav tso cua ntau dua rau polymer kom raug tso tseg los ntawm die. Qhov kev kho no tshem tsov kev tso dej ntau rau ntau yam khoom siv xwm fab xwm fab, xwm fab polycarbonate lossis nylon, kom txo dej ntau thiab siv sijhawm. Qhov kho tawm qhov tawm yog qhov tseem ceeb, feem ntau siv cov roj tswj tshuab kho tshuab kom tso cua tawm, thaum kawg tso cua tawm. Cov tshuab tso dej yuav tsum tau xaiv meej meej kom pab tau cov volatiles tshuab tshem tsov, thiab feem ntau yuav tsum tau siv cov tshuab tso dej kom tso cua tawm. Cov kev cai siv yuav tsum tau muab sib piv meej meej, feem ntau yog qhov tshuab tso dej hauv qhov tawm, uas txiav txim siab vim li cas tshem tsov volatiles thiab kev nyiam. Cov kab ncaum muaj cov khoom siv tshwj tsis siv los tso cua tawm tshiab, tso cua tawm los ntawm kev siv blister rings, fluted sections lossis torpedo elements. Cov kev siv tsis tas siv tsuas yog siv los tso dej, tab sis tseem tshem tsov cov solvents hauv polymerization, monomers, plasticizer fumes, thiab cov gas uas tsim tawm hauv kev tsim. Cov roj teeb tshiab siv cov tshuab tshwj tsis uas tuaj yeem pom qhov cua sov, siv dej ntsuab, thiab motor load kom tshem tsov volatiles zoo dua. Txhawm rau muaj kev pab tshaj qhov roj teeb tshaib, cov chaw no yuav tsum tau muaj kev paub meej meej dua, feem ntau yog kev sau npe, kev tshuaj xyuas, thiab kev saib xyuas cov tshuab tso dej. Qhov kev kho no muaj qhov tseem ceeb heev hauv kev siv khoom siv tshiab, kev tshem tsov cov khoom tsis zoo, kev tsim khoom siv tshiab uas xav tau kev tshem tsov volatiles meej meej, thiab kev tso tseg polymer tsis tso dej.