Mabhegi ekofi chikamu chakakosha cheindasitiri yekurongedza, kunyanya kune vanogadzira kofi vanoda kuchengetedza kunaka uye kutsva kwezvigadzirwa zvavo.Sarudzo pakati pechina-side chisimbiso uye sere-side seal chisimbiso bhegi yekofi zvinoenderana nezvinhu zvakasiyana, kusanganisira huwandu hwekofi uye yaunoda kuchengetedza nguva.
Kana zvasvika kune zvigadzirwa zvebhegi rekofi, vagadziri vanowanzo shandisa yakawanda-layer chimiro kuti ive nechokwadi chemhando yepamusoro.Polyester firimu (PET), polyethylene (PE), aluminium foil (AL), uye naironi (NY) zvinowanzoshandiswa mukugadzirwa kwebhegi rekofi.Chinhu chega chega chinobatsira mukukwanisa kwebhegi kuramba hunyoro, oxidation, uye tembiricha yakakwira, kuve nechokwadi chekuti kofi inogara iri nyowani kwenguva yakareba.
Zvina-side zvakavharwa zvikwama zvekofi zvinozivikanwa nokuda kwemaitiro avo akareruka.Aya mabhegi akanakira kurongedza mavhoriyamu madiki ekofi asingade kuchengetwa kwenguva refu.Iwo anowanzo shandiswa kurongedza bhinzi dzekofi, hupfu, uye mamwe marudzi ekofi yepasi.Nekugadzirwa kwavo kwakatwasuka, mabhegi aya ari nyore kuvhara, kuve nechokwadi chekuti kofi inoramba yakachengeteka uye yakachengetedzwa.