真空充(chong)(chong)氣包(bao)(bao)裝(zhuang)(zhuang)的(de)主(zhu)要(yao)作用(yong)除(chu)真空包(bao)(bao)裝(zhuang)(zhuang)所具備的(de)除(chu)氧保質功能外，主(zhu)要(yao)還有(you)抗壓、阻氣、保鮮等(deng)作用(yong)，能更有(you)效地使食(shi)(shi)品長期(qi)保持原有(you)的(de)色、香、味、形(xing)(xing)及營(ying)養價值。另外，有(you)許(xu)多(duo)食(shi)(shi)品不(bu)適宜采用(yong)真空包(bao)(bao)裝(zhuang)(zhuang)而必須(xu)采用(yong)真空包(bao)(bao)裝(zhuang)(zhuang)機真空充(chong)(chong)氣包(bao)(bao)裝(zhuang)(zhuang)。如松脆易(yi)碎(sui)食(shi)(shi)品，易(yi)結塊食(shi)(shi)品，易(yi)變形(xing)(xing)走油(you)食(shi)(shi)品，有(you)尖銳棱角(jiao)或硬(ying)度(du)較(jiao)高會刺破(po)包(bao)(bao)裝(zhuang)(zhuang)袋(dai)的(de)食(shi)(shi)品等(deng)。食(shi)(shi)品經真空充(chong)(chong)氣包(bao)(bao)裝(zhuang)(zhuang)后，包(bao)(bao)裝(zhuang)(zhuang)袋(dai)內(nei)充(chong)(chong)氣壓強大于包(bao)(bao)裝(zhuang)(zhuang)袋(dai)外大氣壓強，能有(you)效地防止食(shi)(shi)品受(shou)壓破(po)碎(sui)變形(xing)(xing)并(bing)不(bu)影響包(bao)(bao)裝(zhuang)(zhuang)袋(dai)外觀及印刷裝(zhuang)(zhuang)潢(huang)。