真空(kong)充(chong)氣(qi)(qi)包(bao)(bao)裝(zhuang)的(de)主要作(zuo)用(yong)除真空(kong)包(bao)(bao)裝(zhuang)所(suo)具備(bei)的(de)除氧保質功能外(wai)，主要還有(you)(you)(you)抗壓(ya)、阻氣(qi)(qi)、保鮮(xian)等作(zuo)用(yong)，能更有(you)(you)(you)效(xiao)地使(shi)食(shi)品長期(qi)保持原有(you)(you)(you)的(de)色、香、味(wei)、形(xing)及營養(yang)價值。另外(wai)，有(you)(you)(you)許多食(shi)品不適(shi)宜(yi)采(cai)用(yong)真空(kong)包(bao)(bao)裝(zhuang)而必須采(cai)用(yong)真空(kong)包(bao)(bao)裝(zhuang)機(ji)真空(kong)充(chong)氣(qi)(qi)包(bao)(bao)裝(zhuang)。如松(song)脆易碎食(shi)品，易結塊食(shi)品，易變形(xing)走油(you)食(shi)品，有(you)(you)(you)尖銳棱角或硬度較高會(hui)刺(ci)破包(bao)(bao)裝(zhuang)袋(dai)的(de)食(shi)品等。食(shi)品經真空(kong)充(chong)氣(qi)(qi)包(bao)(bao)裝(zhuang)后，包(bao)(bao)裝(zhuang)袋(dai)內充(chong)氣(qi)(qi)壓(ya)強大(da)于包(bao)(bao)裝(zhuang)袋(dai)外(wai)大(da)氣(qi)(qi)壓(ya)強，能有(you)(you)(you)效(xiao)地防止食(shi)品受(shou)壓(ya)破碎變形(xing)并不影響包(bao)(bao)裝(zhuang)袋(dai)外(wai)觀及印刷裝(zhuang)潢。