Lub lim chamber ntawm PP phaj thiab thav duab lim xovxwm muaj PP lim daim hlau thiab PP lim thav duab txheej txheem, ua raws li daim ntawv ntawm lub kaum sab xis noj.Lub phaj thiab thav duab lim xovxwm tsuas yog tso tawm los ntawm kev rub lub phaj.PP phaj thiab thav duab lim xovxwm yog siv rau cov ntaub ntawv uas muaj viscosity siab, thiab cov ntaub lim dej feem ntau ntxuav los yog hloov.PP phaj thiab thav duab lim xovxwm tuaj yeem siv nrog cov ntawv lim kom pom tseeb dua.