Ifilimu yokwelula, eyaziwa nangokuthi ifilimu yokwelula kanye nefilimu yokunciphisa ukushisa, yaqala ukukhiqizwa eShayina kusetshenziswa i-PVC njengezinto eziyisisekelo kanye ne-DOA njenge-plasticizer kanye nomphumela wokunamathela wefilimu yokwelula ye-PVC. Ngenxa yezinkinga zemvelo, izindleko eziphezulu (uma kuqhathaniswa ne-PE, indawo encane yokupakisha ngeyunithi ngayinye) kanye nokunganwebeki kahle, ifilimu yokwelula ye-PE yaqedwa ngesigaba lapho ukukhiqizwa kwasekhaya kuqala ngo-1994-1995. Izinto eziyisisekelo ikakhulukazi yi-LLDPE, kufaka phakathi i-C4, C6, C8 kanye ne-metallocene PE (MPE).
Izici
Ikhiqizwa ngokusebenzisa i-LLDPE resin kanye ne-tackifier ekhethekile yezithasiselo ezifakiwe, futhi ingakhiqiza ifilimu yokugoqa esebenza ngemisebenzi eminingi yesandla, umshini wohlobo lokumelana, umshini wohlobo lwe-pre-stretch, i-anti-UV, i-anti-static kanye ne-anti-rust. Inezinzuzo ezilandelayo:
1. Ukusebenzisa imishini yokuxhumanisa enezingqimba ezimbili, ifilimu yokugoqa ecindezelwe ingakhulisa izici zayo yonke i-polymer ngayinye, ukucaca kwayo, amandla okunamathela, kanye nokumelana nokubhoboka, ifinyelele esimweni esifanele endaweni yokuncibilika.
2. Inezakhiwo ezinhle zokuthambekela, ukucaca okuhle, kanye nobukhulu obufanayo.
3. Inobude obude, ukuqina okuhle, ukumelana okuhle nokudabuka okuvundlile, kanye nomlenze wokuzinamathelisa omuhle kakhulu.
4. Kuyinto engasetshenziswa kabusha enobungani nemvelo, ayinambitheki, ayinabo ubuthi, ingafakwa ngqo ekudleni.
5. ingakhiqiza imikhiqizo yokunamathisela enohlangothi olulodwa, inciphise umsindo okhishwa ngesikhathi senqubo yokugoqa nokwelula, inciphise uthuli nesihlabathi enqubweni yokuthutha nokugcina.
Isicelo
1. Ukupakisha okuvaliwe
Lolu hlobo lokupakisha lufana nokupakisha ifilimu encane, lapho ifilimu isongwa khona iphalethi ukuze igoqwe yonke, bese kuthi izibambo ezimbili zokushisa zishise ifilimu kuzo zombili izinhlangothi ndawonye. Lolu uhlobo lokuqala lwefilimu yokugoqa esetshenziswayo futhi luholele ekwakhiweni kwezinhlobo eziningi zokupakisha.
2. Ukupakisha okugcwele ububanzi
Lolu hlobo lokupakisha ludinga ukuthi ifilimu ibe banzi ngokwanele ukumboza iphalethi, enesimo esijwayelekile, ngakho-ke ifanele ukusetshenziswa ngefilimu enobukhulu obungu-17 kuya ku-35μm.
3. Ukupakisha ngesandla
Lolu hlobo lokupakisha luyindlela elula kakhulu yokupakisha ifilimu yokusonga, ifilimu efakwe eshalofini noma ebanjwa ngesandla, ngokujikeleza kwephalethi noma ifilimu ezungeze iphalethi. Isetshenziswa kakhulu ekupakisheni kabusha amaphalethi asongiwe ngemva kokuphuka, kanye nokupakisha okuvamile kwephalethi. Lolu hlobo lokupakisha luhamba kancane futhi ubukhulu befilimu obufanele bungu-15 kuya ku-20 μm.
