Masamba opangira mankhwala ndi gawo lofunikira m'makampani opanga mankhwala ndipo amachita mbali yofunika kwambiri pakuwonetsetsa kuti chitetezo, champhamvu komanso chamankhwala. Cholinga cha mafilimu a mankhwalawo ndikuteteza mankhwala ku zinthu zachilengedwe, kuipitsidwa, komanso kuwonongeka kwakuthupi, komanso kupereka chidziwitso chofunikira pakugwiritsa ntchito mosamala. PVC (polyvinyl chloride) ndiye zinthu zomwe zimagwiritsidwa ntchito kwambiri muzogulitsa. Ichi ndichifukwa chake pulasitiki ya HSQY imapereka mafilimu ambiri, kuphatikiza kanema wa PVC, PVC / PVDC Filimu, PVC / Pe, PVC / PVDC / PVDC / PE