Ithini likabhiya nesiphuzo liwuhlobo lokupakisha ukudla, futhi akumele lwengeze ngokweqile ezindlekweni zokuqukethwe kwalo. Abenzi bamathini bahlale befuna izindlela zokwenza iphasela lishibhe. Uma ithini lenziwe izingcezu ezintathu: umzimba (kusuka eshidini eliyisicaba) kanye neziphetho ezimbili. Manje amathini amaningi kabhiya nesiphuzo asengamathini aneziqephu ezimbili. Umzimba ukhiqizwa ocezwini olulodwa lwensimbi ngenqubo eyaziwa ngokuthi ukudweba noku-ayina odongeni.
Le ndlela yokwakha ivumela ukusetshenziswa kwensimbi ezacile kakhulu futhi ikani linamandla amakhulu kuphela lapho ligcwele isiphuzo se-carbonated futhi livalwe. I-spin-necking yonga insimbi ngokunciphisa ububanzi bentamo. Phakathi kuka-1970 no-1990, iziqukathi zikabhiya neziphuzo zaba lula ngo-25%. E-USA, lapho i-aluminium ishibhile khona, amathini amaningi kabhiya nesiphuzo enziwa ngaleyo nsimbi. EYurophu, i-tinplate ivame ukushibhile, futhi amathini amaningi enziwa ngalokhu. I-tinplate yesimanje yobhiya nesiphuzo inothayela ophansi phezulu, imisebenzi eyinhloko yethayela iyizimonyo kanye nokuthambisa (enqubweni yokudweba). Ngakho-ke i-lacquer enezakhiwo ezinhle kakhulu zokuzivikela iyadingeka, ukuze isetshenziswe ngesisindo esincane sejazi (6-12 µm, kuncike ohlotsheni lwensimbi).
Ukwenza amathini ukonga kuphela uma amathini engenziwa ngokushesha okukhulu. Amathini angaba ngu-800–1000 ngomzuzu azokhiqizwa emugqeni owodwa wokunamathela, onemizimba neziphetho zimbozwe ngokwehlukana. Imizimba yamathini kabhiya namathini esiphuzo i-lacquered ngemva kokwenziwa nokukhishwa amafutha. Ukusetshenziswa okusheshayo kufinyelelwa ngokuqhuma okufushane kwesifutho esingenawo umoya kusuka kumcibisholo obekwe ngokuphambana nendawo emaphakathi nendawo evulekile yekani elivundlile. I-lance ingase imile noma ifakwe ethini bese ikhishwa. I-can ibanjwe ku-chuck futhi ijikelezwe ngokushesha ngesikhathi sokufafaza ukuze kutholwe ukunamathela okufanayo okufana kakhulu ngangokunokwenzeka. I-coating viscosity kufanele ibe phansi kakhulu, futhi i-solids ibe ngu-25-30%. Umumo ulula uma kuqhathaniswa, kodwa ingaphakathi liphulukiswa ngomoya oshisayo odluliselwe, ngamashejuli acishe abe yimizuzu emi-3 ku-200 °C.
Iziphuzo ezithambile ezine-carbonated zine-acidic. Ukumelana nokugqwala kwemikhiqizo enjalo kunikezwa ngezingubo ezifana ne-epoxy-amino resin noma izinhlelo ze-epoxy-phenolic resin. Ubhiya uwukugcwalisa kancane kwekani, kodwa ukunambitheka kwawo kungase konakaliswe kalula ngokucosha insimbi ethini noma ngezinto zokulandela umkhondo ezikhishwe ku-lacquer, kangangokuthi futhi udinga ama-lacquers angaphakathi asezingeni eliphezulu afanayo.
Iningi lalezi zingubo zokumboza ziguqulelwe ngempumelelo emanzini amasistimu ahlakazekile nge-colloidally noma emulsion polymer, ikakhulukazi ku-substrate elula yokuvikela, i-aluminium. Izindwangu ezisekelwe emanzini zinciphise izindleko zizonke futhi zehlisa inani le-solvent okufanele ilahlwe yizimbawula ezingemuva ukuze kugwenywe ukungcola. Amasistimu amaningi aphumelele asekelwe kuma-epoxy-acrylic copolymers ane-amino noma i-phenolic crosslinkers.
Kuyaqhubeka nokuba nesithakazelo sokuhweba ku-electrodeposition yama-lacquers asekelwe emanzini kubhiya namathini esiphuzo. Inqubo enjalo igwema isidingo sokufaka amajazi amabili, futhi ikwazi ukunikeza okunamathelayo okungenasici ukumelana nokuqukethwe kwekani ngezisindo eziphansi zefilimu eyomile. Ezimpahleni zokufutha ezithwala amanzi, kufunwa okuqukethwe kwe-solvent engaphansi kuka-10-15%.
Isikhathi sokuthumela: Dec-09-2022