真空充氣(qi)包裝的主要(yao)作用(yong)除真空包裝所具備的除氧保質(zhi)功(gong)能外(wai),主要(yao)還有抗壓、阻氣、保鮮等(deng)作用(yong)(yong),能更有(you)(you)效(xiao)地使食(shi)(shi)(shi)(shi)品(pin)(pin)長期保(bao)持原(yuan)有(you)(you)的色、香、味、形及(ji)(ji)營養價值(zhi)。另(ling)外(wai)(wai),有(you)(you)許多食(shi)(shi)(shi)(shi)品(pin)(pin)不適宜(yi)采用(yong)(yong)真(zhen)(zhen)空(kong)(kong)(kong)包(bao)(bao)裝(zhuang)而必須采用(yong)(yong)真(zhen)(zhen)空(kong)(kong)(kong)充氣(qi)(qi)包(bao)(bao)裝(zhuang)。如松脆易(yi)碎食(shi)(shi)(shi)(shi)品(pin)(pin),易(yi)結塊食(shi)(shi)(shi)(shi)品(pin)(pin),易(yi)變(bian)形走(zou)油食(shi)(shi)(shi)(shi)品(pin)(pin),有(you)(you)尖銳棱角或硬度較高會刺(ci)破包(bao)(bao)裝(zhuang)袋(dai)的食(shi)(shi)(shi)(shi)品(pin)(pin)等(deng)。食(shi)(shi)(shi)(shi)品(pin)(pin)經真(zhen)(zhen)空(kong)(kong)(kong)充氣(qi)(qi)包(bao)(bao)裝(zhuang)后(hou),包(bao)(bao)裝(zhuang)袋(dai)內充氣(qi)(qi)壓(ya)強大于包(bao)(bao)裝(zhuang)袋(dai)外(wai)(wai)大氣(qi)(qi)壓(ya)強,能有(you)(you)效(xiao)地防(fang)止(zhi)食(shi)(shi)(shi)(shi)品(pin)(pin)受壓(ya)破碎變(bian)形并不影響包(bao)(bao)裝(zhuang)袋(dai)外(wai)(wai)觀及(ji)(ji) 印(yin)刷裝(zhuang)潢。真(zhen)(zhen)空(kong)(kong)(kong)充氣(qi)(qi)包(bao)(bao)裝(zhuang)在真(zhen)(zhen)空(kong)(kong)(kong)后(hou)再充入(ru)氮氣(qi)(qi)、二(er)氧化(hua)碳、氧氣(qi)(qi)單一氣體或二 三種(zhong)氣(qi)(qi)(qi)體(ti)的混合氣(qi)(qi)(qi)體(ti)。其(qi)(qi)氮氣(qi)(qi)(qi)是惰性氣(qi)(qi)(qi)體(ti),起充填(tian)作用,使袋(dai)內保(bao)持正壓 ,以(yi)防止袋(dai)外空氣(qi)(qi)(qi)進入袋(dai)內,對(dui)食品(pin)起到一個保(bao)護作用。其(qi)(qi)二氧化碳能夠溶于(yu)各類脂肪(fang)或水,引成酸性較(jiao)弱(ruo)的碳酸,有抑(yi)制霉菌、腐(fu)敗細菌等微生物的活性。其(qi)(qi)氧氣(qi)(qi)(qi)具有抑(yi)制厭氧菌的生長繁殖,保(bao)持水果、蔬菜的新鮮及色彩,高(gao)濃(nong)度氧氣(qi)(qi)(qi)可(ke)使新鮮肉(rou)類保(bao)持其(qi)(qi)鮮紅色。
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