Thawj taw tes: txawv cov ntsiab lus kub. Isopentane muaj qhov kub ntawm 28 degree, thaum cyclopentane muaj qhov kub ntawm 49 degree. Piv rau CFC-11 (qhov kub ntawm qhov kub ntawm 23.8 degree), isopentane yog qhov ze tshaj plaws. Thaum siv los ua tus neeg sawv cev tshuab, isopentane kom meej meej haum dua li cyclopentane. Nyob rau hauv cov txheej txheem foaming ntawm nruj polyurethane ua npuas ncauj, lub tshav kub tso tawm los ntawm cov tshuaj tiv thaiv ntawm polyether polyol thiab isocyanate yog siv los ua cua sov tus neeg sawv cev tshuab.
Lub tshuab tshuab vaporizes raws li cua sov, ua ib tug foaming nyhuv. Ib feem ntawm nws khiav tawm, thiab ib feem tseem nyob hauv cov hlwb ua npuas ncauj. Sib piv isopentane thiab cyclopentane, thaum siv isopentane, polyether polyol thiab isocyanate cov tshuaj tiv thaiv tawm cov cua sov, thiab thaum kub siab tshaj 28 degree, isopentane vaporizes thiab pib cov txheej txheem foaming. Txawm li cas los xij, cyclopentane yuav tsum muaj qhov ntsuas kub kom ncav cuag 50℃ua ntej nws vaporizes thiab pib foaming. Yog li ntawd, cov kab ntau lawm hauv tub yees siv cyclopentane ua tus neeg sawv cev tshuab yuav tsum preheating pwm mus rau qhov kub thiab txias, thiab qhov kub ntawm ambient kub hauv lub rooj cob qhia foaming kuj yog vim li no.
Preheating cov pwm thiab tswj qhov kub thiab txias hauv qhov chaw ua haujlwm foaming yuav tsum muaj qhov cua sov, uas ua rau qee cov nqi tsim khoom. Kev siv cyclo / isopentane ua tus neeg sawv cev tshuab yuav tsum qis dua qhov kub thiab txias pwm piv rau kev siv cyclopentane. Cov txheej txheem foaming yuav tsum muaj tsawg dua preheating ntawm pwm thiab txo qhov kub thiab txias, uas tuaj yeem txuag hluav taws xob thiab txo cov nqi.
