Samfuran ether na cellulose HPMC da HEMC suna da ƙungiyoyin hydrophobic da hydrophilic. Ƙungiyar methoxy ita ce hydrophobic, kuma ƙungiyar hydroxypropoxy ta bambanta bisa ga matsayin maye gurbin. Wasu suna hydrophilic kuma wasu suna hydrophobic. Hydroxyethoxy shine hydrophilic. Abin da ake kira hydrophilicity yana nufin cewa yana da dukiyar kasancewa kusa da ruwa; da hydrophobicity yana nufin cewa yana da dukiya na tunkude ruwa. Tun da samfurin yana da hydrophilic da hydrophobic, samfurin ether cellulose yana da aikin saman, wanda ke haifar da kumfa. Idan ɗaya daga cikin kaddarorin biyu kawai shine hydrophilic ko hydrophobic, ba za a haifar da kumfa ba. Duk da haka, HEC kawai yana da rukunin hydrophilic na ƙungiyar hydroxyethoxy kuma ba shi da ƙungiyar hydrophobic, don haka ba zai haifar da kumfa ba.
Lamarin kumfa kuma yana da alaƙa kai tsaye da ƙimar rushewar samfurin. Idan samfurin ya narke a ƙimar da bai dace ba, kumfa za su yi. Gabaɗaya, ƙananan danko, saurin rushewa. Mafi girma da danko, da sannu a hankali da rushe kudi. Wani dalili shine matsalar granulation, granulation ba daidai ba ne (girman barbashi ba daidai ba ne, akwai manya da ƙananan). Yana sa lokacin rushewa ya zama daban-daban, yana haifar da kumfa mai iska.
Abubuwan da ke tattare da kumfa na iska na iya ƙara yawan yanki na batch scraping, kayan gine-gine kuma an inganta su, slurry yana da sauƙi, kuma raguwa ya fi sauƙi. Rashin hasara shine kasancewar kumfa zai rage yawan samfurin samfurin, rage ƙarfi, kuma yana shafar juriyar yanayin kayan.
Lokacin aikawa: Fabrairu-27-2023