Cov kav dej hauv pem teb puas tuaj yeem kub-Melted nrog PPR

Tsis yog, vim tias lawv yog ob hom sib txawv ntawm cov kav dej, uas sib txawv heev ntawm cov khoom siv raw thiab cov txheej txheem ntau lawm. Nyob rau tib lub sijhawm, cov qauv molecular, ntom ntom, siab tsis kam thiab kub tsis kam ntawm cov kav dej kuj sib txawv, yog li lawv tsis tuaj yeem kub-melted. Yog hais tias lawv yog kub-melted ua ke, lub adhesion yuav ploj, thiab lub firmness ntawm cov kav dej yuav tsis tau guaranteed, uas ua rau to thiab lwm yam tshwm sim.