The zachipatala atatu wosanjikiza chubu mkati timapanga makamaka wapangidwa PEBAX kapena nayiloni zakunja, liniya otsika-kachulukidwe polyethylene pakati wosanjikiza ndi mkulu-kachulukidwe polyethylene wamkati wosanjikiza. Titha kupereka zida zakunja zokhala ndi zinthu zosiyanasiyana, kuphatikiza PEBAX, PA, PET ndi TPU, ndi zida zamkati zomwe zili ndi zinthu zosiyanasiyana, monga polyethylene yapamwamba kwambiri. Zachidziwikire, titha kusinthanso mtundu wa chubu lamkati la magawo atatu malinga ndi zomwe mukufuna.