真空(kong)(kong)充(chong)氣(qi)(qi)包(bao)裝(zhuang)的主(zhu)要(yao)作用除真空(kong)(kong)包(bao)裝(zhuang)所具備的除氧保質功能(neng)(neng)外(wai)，主(zhu)要(yao) 還有(you)抗壓、阻氣(qi)(qi)、保鮮等作用，能(neng)(neng)更有(you)效(xiao)地 使食(shi)(shi)品(pin)(pin)(pin)(pin)長期保持原有(you)的色、香、味(wei)、形及(ji)營養價(jia)值。另(ling)外(wai)，有(you)許多食(shi)(shi)品(pin)(pin)(pin)(pin)不適宜采(cai)用真空(kong)(kong)包(bao)裝(zhuang)而必(bi)須采(cai)用真空(kong)(kong)充(chong)氣(qi)(qi)包(bao)裝(zhuang)。如(ru)松脆易(yi)碎食(shi)(shi)品(pin)(pin)(pin)(pin)，易(yi)結塊食(shi)(shi)品(pin)(pin)(pin)(pin)，易(yi)變形走油食(shi)(shi)品(pin)(pin)(pin)(pin)，有(you)尖(jian)銳棱角或硬(ying)度(du)較高會刺破包(bao)裝(zhuang)袋(dai)的食(shi)(shi)品(pin)(pin)(pin)(pin)等。食(shi)(shi)品(pin)(pin)(pin)(pin)經真空(kong)(kong)充(chong)氣(qi)(qi)包(bao)裝(zhuang)后，包(bao)裝(zhuang)袋(dai)內充(chong)氣(qi)(qi)壓強大于包(bao)裝(zhuang)袋(dai)外(wai)大氣(qi)(qi)壓強，能(neng)(neng)有(you)效(xiao)地防止食(shi)(shi)品(pin)(pin)(pin)(pin)受壓破碎變形并(bing)不影(ying)響包(bao)裝(zhuang)袋(dai)外(wai)觀及(ji) 印(yin)刷裝(zhuang)潢。