Cov thawv ntim khoom siv ua cov khoom ntim khoom tseem ceeb hauv kev lag luam khoom noj khoom haus; tshwj xeeb tshaj yog nyob rau hauv cov ntsiab lus ntawm kev xa zaub mov, lawv qhov kev tsim qauv tsim, xau- cov khoom pov thawj, thiab thermal kuj cuam tshuam ncaj qha rau kev khaws cia zoo ntawm cov zaub mov thiab tag nrho cov neeg siv kev paub. Raws li kev lag luam embraces ntau dua standardization thiab stricter ib puag ncig cov kev cai, cov kev ua hauj lwm yuav tsum tau rau takeout ntim tau ua kom zoo dua. Cov kev xav tau no tau hloov zuj zus dhau qhov kev ua haujlwm tseem ceeb ntawm tsuas yog tuav cov zaub mov kom suav nrog cov kev xav tau tshwj xeeb-xws li kev tiv thaiv kev xau, thermal rwb thaiv tsev, thiab tiv thaiv thermal shock- yog li tsim cov thawv ntim khoom no yog ib qho tseem ceeb hauv kev hloov kho thev naus laus zis ntawm cov khoom noj khoom haus.
Noj cov thawv ntim khoom thoob plaws txhua qhov raws li qhov piv txwv tseem ceeb, nws txoj haujlwm tseem ceeb yog nyob ntawm ob yam tseem ceeb: "kua- pov thawj kev ncaj ncees" thiab "kev tiv thaiv thermal." Leak-cov ntaub ntawv pov thawj tau ua tiav los ntawm kev sib cuam tshuam nruj ntawm lub thawv lub cev thiab lub hau- feem ntau yog siv snap- xauv lossis nias- haum kaw- uas tiv thaiv cov kua xau thiab tiv thaiv kev tsis sib haum xeeb uas tshwm sim los ntawm cov pob thiab jolts tshwm sim hauv cov txheej txheem tsheb thauj mus los. Thermal resistance, conversely, yog paub los ntawm kev ceev faj xaiv cov khoom thiab optimized manufacturing txheej txheem. Cov thawv ntim khoom loj feem ntau siv cov khoom yas xws li polypropylene (PP) lossis polystyrene (PS); Ntawm cov no, PP sawv tawm raws li qhov kev xaiv zoo tshaj plaws rau cov xwm txheej uas muaj cov khoom noj kub thiab txias, ua tsaug rau nws qhov muaj zog tiv taus rau ob qho tib si kub qis (txog -20 degree) thiab kub siab (txog 120 degree). Piv txwv li, cov thawv ntim cov khoom xyaw tshiab yuav tsum tswj hwm lawv cov qauv kev ncaj ncees nyob rau hauv ib puag ncig cov tub yees, thaum cov khoom siv rau kev xa khoom kub yuav tsum tiv taus siab - qhov kub thiab txias yam tsis muaj deforming-scenarios nyob rau hauv uas lub hauv paus molecular stability ntawm PP cov ntaub ntawv qhia txawv qhov zoo.
