真空(kong)(kong)充(chong)氣(qi)(qi)包裝(zhuang)(zhuang)(zhuang)的(de)主要(yao)作用(yong)除真空(kong)(kong)包裝(zhuang)(zhuang)(zhuang)所具備的(de)除氧保(bao)(bao)質功能(neng)(neng)外(wai)(wai)，主要(yao) 還有(you)(you)(you)抗壓、阻氣(qi)(qi)、保(bao)(bao)鮮等作用(yong)，能(neng)(neng)更有(you)(you)(you)效地(di) 使食(shi)(shi)(shi)品(pin)長期保(bao)(bao)持(chi)原有(you)(you)(you)的(de)色、香、味、形(xing)及營養價值。另外(wai)(wai)，有(you)(you)(you)許多食(shi)(shi)(shi)品(pin)不(bu)適宜采用(yong)真空(kong)(kong)包裝(zhuang)(zhuang)(zhuang)而必須采用(yong)真空(kong)(kong)充(chong)氣(qi)(qi)包裝(zhuang)(zhuang)(zhuang)。如松脆易碎食(shi)(shi)(shi)品(pin)，易結(jie)塊食(shi)(shi)(shi)品(pin)，易變形(xing)走油食(shi)(shi)(shi)品(pin)，有(you)(you)(you)尖銳棱角或硬度較高會刺破(po)包裝(zhuang)(zhuang)(zhuang)袋(dai)的(de)食(shi)(shi)(shi)品(pin)等。食(shi)(shi)(shi)品(pin)經真空(kong)(kong)充(chong)氣(qi)(qi)包裝(zhuang)(zhuang)(zhuang)后(hou)，包裝(zhuang)(zhuang)(zhuang)袋(dai)內(nei)充(chong)氣(qi)(qi)壓強(qiang)(qiang)大于包裝(zhuang)(zhuang)(zhuang)袋(dai)外(wai)(wai)大氣(qi)(qi)壓強(qiang)(qiang)，能(neng)(neng)有(you)(you)(you)效地(di)防止食(shi)(shi)(shi)品(pin)受壓破(po)碎變形(xing)并不(bu)影響包裝(zhuang)(zhuang)(zhuang)袋(dai)外(wai)(wai)觀及 印(yin)刷裝(zhuang)(zhuang)(zhuang)潢。