真空(kong)(kong)(kong)(kong)充(chong)(chong)氣(qi)(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)的主要(yao)(yao)作用(yong)除真空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)所具備的除氧保(bao)(bao)質功能(neng)外，主要(yao)(yao)還(huan)有(you)(you)(you)(you)抗(kang)壓、阻氣(qi)(qi)(qi)、保(bao)(bao)鮮(xian)等作用(yong)，能(neng)更有(you)(you)(you)(you)效地(di)(di)使食(shi)品(pin)(pin)(pin)長期(qi)保(bao)(bao)持(chi)原有(you)(you)(you)(you)的色、香、味(wei)、形(xing)及營養(yang)價(jia)值(zhi)。另外，有(you)(you)(you)(you)許多(duo)食(shi)品(pin)(pin)(pin)不(bu)適宜采用(yong)真空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)而(er)必須采用(yong)真空(kong)(kong)(kong)(kong)包(bao)(bao)裝(zhuang)(zhuang)機真空(kong)(kong)(kong)(kong)充(chong)(chong)氣(qi)(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)。如松脆易(yi)碎食(shi)品(pin)(pin)(pin)，易(yi)結塊食(shi)品(pin)(pin)(pin)，易(yi)變形(xing)走油食(shi)品(pin)(pin)(pin)，有(you)(you)(you)(you)尖銳(rui)棱角(jiao)或硬度較(jiao)高(gao)會刺破(po)包(bao)(bao)裝(zhuang)(zhuang)袋(dai)的食(shi)品(pin)(pin)(pin)等。食(shi)品(pin)(pin)(pin)經真空(kong)(kong)(kong)(kong)充(chong)(chong)氣(qi)(qi)(qi)包(bao)(bao)裝(zhuang)(zhuang)后，包(bao)(bao)裝(zhuang)(zhuang)袋(dai)內(nei)充(chong)(chong)氣(qi)(qi)(qi)壓強(qiang)大于包(bao)(bao)裝(zhuang)(zhuang)袋(dai)外大氣(qi)(qi)(qi)壓強(qiang)，能(neng)有(you)(you)(you)(you)效地(di)(di)防止食(shi)品(pin)(pin)(pin)受壓破(po)碎變形(xing)并不(bu)影響包(bao)(bao)裝(zhuang)(zhuang)袋(dai)外觀及印刷裝(zhuang)(zhuang)潢。