Imodeli ye-GB 4-tandem (2/6-tandem) yensimbi engagqwali elawulwa izinga lokushisa elawulwa izigubhu ezinezigubhu ezine, ezimbili noma eziyisithupha ezincane zensimbi engagqwali, okuyizo zonke eziwuhlobo olufanayo ukuze ukuhlolwa okune, okubili noma okuyisithupha kungenziwa ngesikhathi, ngaleyo ndlela kuzuzwe umphumela ongcono kakhulu. imishini inemisebenzi yesikhathi yokulawula ingqikithi yesikhathi somjikelezo wokusebenza , ubude besikhathi sokujikeleza ukuya phambili nangemuva.Isivinini sesigubhu singalawulwa ngokusekelwe esimisweni senqubo.Ifasitela lokubuka lenziwe ngengilazi eqinile ecace ngokugcwele ukuze izimo zokusebenza zesikhumba esigubhini zicace ngokubuka nje.Noma isiphi isigubhu singamiswa ngokuthanda kwakhe ngesikhathi sokusebenza kwe-cdlua ingena ohlelweni lwe-cdluater. izigubhu ngesikhathi sezigubhu zisebenza ngokusebenzisa uhlelo lokulayisha.Imishini ifaneleka ngokukhethekile ukuhlolwa kokuqhathanisa kwezikhumba ezihlukahlukene ngenqwaba encane kanye nezinhlobonhlobo zokwenza isikhumba.
Ithuluzi elibalulekile elisetshenziswa kabanzi kuma-tanneries, izigubhu zokhuni ezinezigxobo eziphakanyisiwe ezakhelwe ngaphakathi noma amabhodi esikhumba. Isikhumba singacutshungulwa kanyekanye ngamaqoqo ngaphakathi kwesigubhu. Uma iqhutshwa igiya ukuze ijikeleze, isikhumba esisegqomeni sibhekene nokugoba okuqhubekayo, ukwelula, ukugubha, ukugubha kanye nezinye izenzo zemishini, okusheshisa inqubo yokusabela kwamakhemikhali futhi kuguqule izakhiwo ezibonakalayo zesikhumba. Uhla lokusetshenziswa kwesigubhu luhlanganisa izinqubo eziningi zokucubungula ezimanzi zokushukwa, kanye nokuthamba okomile nokuphaphatheka, njll.
