真空(kong)充(chong)氣(qi)包(bao)(bao)裝(zhuang)的主要作用除真空(kong)包(bao)(bao)裝(zhuang)所(suo)具備的除氧保(bao)質功能外(wai)，主要還有(you)(you)(you)(you)抗壓(ya)、阻氣(qi)、保(bao)鮮等作用，能更有(you)(you)(you)(you)效地(di)(di)使食(shi)(shi)(shi)品(pin)(pin)(pin)長(chang)期保(bao)持原有(you)(you)(you)(you)的色、香、味、形及(ji)營(ying)養價(jia)值(zhi)。另(ling)外(wai)，有(you)(you)(you)(you)許多食(shi)(shi)(shi)品(pin)(pin)(pin)不適宜采用真空(kong)包(bao)(bao)裝(zhuang)而必須采用真空(kong)包(bao)(bao)裝(zhuang)機(ji)真空(kong)充(chong)氣(qi)包(bao)(bao)裝(zhuang)。如松脆易碎(sui)食(shi)(shi)(shi)品(pin)(pin)(pin)，易結(jie)塊食(shi)(shi)(shi)品(pin)(pin)(pin)，易變形走油(you)食(shi)(shi)(shi)品(pin)(pin)(pin)，有(you)(you)(you)(you)尖銳棱(leng)角或硬度較高會刺(ci)破包(bao)(bao)裝(zhuang)袋的食(shi)(shi)(shi)品(pin)(pin)(pin)等。食(shi)(shi)(shi)品(pin)(pin)(pin)經(jing)真空(kong)充(chong)氣(qi)包(bao)(bao)裝(zhuang)后，包(bao)(bao)裝(zhuang)袋內充(chong)氣(qi)壓(ya)強(qiang)大于包(bao)(bao)裝(zhuang)袋外(wai)大氣(qi)壓(ya)強(qiang)，能有(you)(you)(you)(you)效地(di)(di)防止食(shi)(shi)(shi)品(pin)(pin)(pin)受壓(ya)破碎(sui)變形并不影響包(bao)(bao)裝(zhuang)袋外(wai)觀及(ji)印刷(shua)裝(zhuang)潢。