Qhov duab ntawm qhov rooj tsim los yog qhov ntev tshwm sim ntawm plastic uas muaj duab ntsim thiab zoo ib txhiab uas tsim los los ntawm kev tsim kho. Cov duab no yog ib qho hauv ob qho tshwj tsis pub dhau los yog cov khoom siv ntau tshaj plaws hauv kev lag luam ntawm plastic, pom hauv kev siv tib yam li qhov chaw siv rau kev lag luam lossis qhov chaw siv tseem ceeb rau kev tsim kho. Duab ntawm qhov rooj tsim yog txiav txim los ntawm kev tsim kho ntawm qhov rooj uas cov plastic hlwb yog xam los. Cov duab tuaj yeem yog hlwb, sov lossis muaj ntau qhov khaub, thiab qhov kev tsim kho yog feem ntau txo rau kev siv tshwj tsis pub dhau li kev tsim kho qhov ruaj khov, kev tiv thaiv kub, lossis raws li qhov chaw rau kev nruj siab cov ntu xeeb. Kev xaiv thawj yas yog tseem ceeb thiab xaiv los ntawm cov yas xav tau: PVC rau kev tiv thaiv ua pa, Polycarbonate rau kev tiv thaiv tshuab, Acetal rau kev tiv thaiv kev sib thaub, thiab Polyamide muaj roj (xws li PA66 GF30) rau kev ruaj khov thiab kev tiv thaiv kub zoo tshaj rau kev siv hauv kev tsim kho qhov khaub rau cov kab ntse thiab cov kab ntim. Qhov tseeb ntawm qhov duab tsim yog xaiv los ntawm qhov ntev, qhov saum npoo, qhov sib xws ntawm lub color, thiab cov ntu tshwj tsis pub dhau. Muab qhov tseeb no yog kev daws teeb meem tshaj plaws rau kev tsim kho, xws li su temperature, line speed, thiab cooling rate. Qhov tswj hwm kom tsim cov duab tseem ceeb thiab muaj kev nyuaj siab yog tsim kho qhov tsis pub dhau los yog kev tsim kho cov khoom siv tshiab tsis tas yuav tsum muaj kev lag luam ntxiv.