真(zhen)空充(chong)(chong)氣包裝(zhuang)的主(zhu)要作用除真(zhen)空包裝(zhuang)所具備的除氧保質功能(neng)(neng)(neng)外(wai)，主(zhu)要還有(you)(you)抗壓、阻氣、保鮮(xian)等作用，能(neng)(neng)(neng)更(geng)有(you)(you)效地使食(shi)(shi)(shi)品長期保持原(yuan)有(you)(you)的色、香、味、形及(ji)營養價(jia)值(zhi)。另外(wai)，有(you)(you)許(xu)多食(shi)(shi)(shi)品不適(shi)宜采(cai)用真(zhen)空包裝(zhuang)而必須采(cai)用真(zhen)空包裝(zhuang)機真(zhen)空充(chong)(chong)氣包裝(zhuang)。如(ru)松脆易(yi)碎食(shi)(shi)(shi)品，易(yi)結(jie)塊食(shi)(shi)(shi)品，易(yi)變(bian)形走油(you)食(shi)(shi)(shi)品，有(you)(you)尖銳棱角或硬度較(jiao)高(gao)會刺(ci)破(po)包裝(zhuang)袋(dai)的食(shi)(shi)(shi)品等。食(shi)(shi)(shi)品經真(zhen)空充(chong)(chong)氣包裝(zhuang)后，包裝(zhuang)袋(dai)內充(chong)(chong)氣壓強大于(yu)包裝(zhuang)袋(dai)外(wai)大氣壓強，能(neng)(neng)(neng)有(you)(you)效地防止食(shi)(shi)(shi)品受壓破(po)碎變(bian)形并(bing)不影(ying)響包裝(zhuang)袋(dai)外(wai)觀及(ji)印刷裝(zhuang)潢。