Preheating ntawm kub xovxwm

Cua sov cov khoom siv molding ua ntej nias kom tshem tawm cov dej noo thiab lwm yam khoom tsis haum tuaj yeem ua rau tus nqi kho thiab ua kom lub voj voog luv luv; txhim kho qhov uniformity ntawm cov khoom curing, txhim kho lub cev thiab txhua yam khoom ntawm cov khoom, thiab txhim kho fluidity ntawm cov khoom molded.