Rufi yashi harsashi simintin a China simintin kamfanin.
A yayin yin simintin gyare-gyaren harsashi, da farko muna bukatar yin samfuran gwargwadon bukatun kwastomomi da zane, tare da yin la'akari da alawus din 'yan wasa. Kafin yin gyaran simintin gyare-gyare da cibiya, an rufe yashi mai rufi da wani daskararren fim mai kankara a saman barbashin yashin. An kuma kira shi da yashi mai rufi yashi (tsakiya) yashi. Tsarin kere-kere shine hada bishiyar kayan kwalliya da danyen yashi da kuma karfafa shi lokacin da yayi zafi. An haɓaka shi zuwa yashi mai rufi ta amfani da resin thermoplastic phenolic resin tare da wakili mai warkarwa na ɓoye (kamar urotropine) da man shafawa (kamar alli stearate) ta hanyar takamaiman tsari. Lokacin da yashi mai rufi ya yi zafi, fiska mai rufi a saman ƙurar yashi tana narkewa. A karkashin aikin kungiyar methylene wanda Maltropine ya lalata, narkakken zafin da yake saurin canzawa daga sifa mai tsari zuwa tsarin jikin mutum wanda ba zai yiwu ba domin yashi yashi ya zama ya karu kuma ya samu. Baya ga babban bushewar ɗamarar dusar ƙanƙara mai narkewa, akwai kuma yashi mai ruɓaɓɓe da viscous.
Idan aka kwatanta da sauran yashi, tokin yashi yana da halaye masu zuwa
1) Yana da ƙarfin ƙarfin dacewa. Zai iya biyan buƙatun don babban yashi harsashi mai yashi, yashi mai matsakaicin ƙarfi mai zafi, da yashi mara ƙarfi mai ƙarfi mara ƙarfi.
2) Kyakkyawan ruwa, kyakyawan tsarin rairayin yashi da bayyanannen shaci, wanda zai iya samar da mafi hadaddun yashi, kamar su jaket ruwan yadin kamar su silinda kai da jikin injina.
3) Ingancin farfajiyar yashin yana da kyau, karami kuma ba sako-sako ba ne. Ko da an yi amfani da lessasa ko babu rufi, ana iya samun ingancin juzu'in simintin gyaran sama. Girman daidaito na simintin gyare-gyare na iya isa CT7-CT8, kuma ƙarancin yanayin Ra zai iya isa 6.3-12.5μm.
4) Kyakkyawan durkushewa, wanda ke da fa'ida don jefa tsabtatawa da inganta aikin samfuran
5) Gishirin yashi ba shi da sauƙi don ɗaukar danshi, kuma ƙarfin ajiyar lokaci mai sauƙi ba shi da sauƙi don ragewa, wanda ke dacewa da adanawa, safara da amfani
Masana'antu matakai na rufi yashi mold (core) yin domin harsashi gyare-gyaren simintin gyaran kafa:
1. Ainihin tsari na kera mai rufin yashi (asali) shine: juyewa ko busa yashi → ɓawon ruwa charge fitowar yashi den taurare → core (mould) da sauransu.
1) Juya ko busa yashi. Wato, an zubo da yashi mai laushi a jikin kwasfa ko an busa cikin babban akwatin don ƙirƙirar ƙwarjin ko ƙwarjin ɗin.
2) Amincewa. Ana sarrafa kaurin Layer ɗin harsashi ta hanyar daidaita yanayin zafin jiki da riƙe lokaci.
3) Ruwan yashi. Ilt lanƙwasa kayan kwalliyar da babban akwatin don sanya yashi mai ruɓaɓɓe ya faɗi daga farfajiyar harsashi mai zafi, kuma tattara shi don sake amfani dashi. Don sauƙaƙa cire cirewar yashi mara narkewa, idan ya cancanta, za a iya amfani da hanyar inji ta girgiza gaba da gaba.
4) eningarfafawa A cikin yanayin dumama, don yin kaurin ƙwarjin ya zama daidai, sanya shi ya haɗu da saman harsashin mai zafi a cikin wani lokaci don ƙarin tauri.
5) theauki gindi. Auki siffar harsashi mai ƙarfi da ƙwarjin harsashi daga cikin sifa da babban akwatin.
