真(zhen)空(kong)充(chong)(chong)氣包(bao)裝(zhuang)(zhuang)的(de)主要作用(yong)除真(zhen)空(kong)包(bao)裝(zhuang)(zhuang)所(suo)具備的(de)除氧(yang)保質功能外(wai)，主要還有(you)(you)抗壓、阻(zu)氣、保鮮等(deng)作用(yong)，能更有(you)(you)效地(di)使食(shi)(shi)(shi)品長期保持原有(you)(you)的(de)色、香、味、形及營養價值。另外(wai)，有(you)(you)許多(duo)食(shi)(shi)(shi)品不適宜采用(yong)真(zhen)空(kong)包(bao)裝(zhuang)(zhuang)而必須采用(yong)真(zhen)空(kong)包(bao)裝(zhuang)(zhuang)機(ji)真(zhen)空(kong)充(chong)(chong)氣包(bao)裝(zhuang)(zhuang)。如松(song)脆易(yi)碎食(shi)(shi)(shi)品，易(yi)結(jie)塊食(shi)(shi)(shi)品，易(yi)變形走油(you)食(shi)(shi)(shi)品，有(you)(you)尖銳棱角或(huo)硬度較高會刺(ci)破包(bao)裝(zhuang)(zhuang)袋的(de)食(shi)(shi)(shi)品等(deng)。食(shi)(shi)(shi)品經(jing)真(zhen)空(kong)充(chong)(chong)氣包(bao)裝(zhuang)(zhuang)后，包(bao)裝(zhuang)(zhuang)袋內充(chong)(chong)氣壓強大于包(bao)裝(zhuang)(zhuang)袋外(wai)大氣壓強，能有(you)(you)效地(di)防(fang)止食(shi)(shi)(shi)品受壓破碎變形并(bing)不影響(xiang)包(bao)裝(zhuang)(zhuang)袋外(wai)觀(guan)及印刷裝(zhuang)(zhuang)潢(huang)。