采(cai)用真空(kong)(kong)(kong)包(bao)裝機包(bao)裝物品其特點(dian)有(you)(you)以下幾個(ge)方(fang)面:一是(shi)排除了(le)包(bao)裝容(rong)(rong)器(qi)中的(de)部分空(kong)(kong)(kong)氣(氧(yang)氣),能有(you)(you)效地防止食(shi)品腐敗(bai)變質.二(er)是(shi)采(cai)用阻隔性(xing)(氣密性(xing))優良的(de)包(bao)裝材(cai)料及嚴格(ge)的(de)密封技術和要求,能有(you)(you)效防止包(bao)裝內物品的(de)交換,即可(ke)避(bi)免(mian)減重、失味,又可(ke)防止二(er)次污染.三是(shi)真空(kong)(kong)(kong)包(bao)裝容(rong)(rong)器(qi)內部氣體已排除,加(jia)速了(le)熱(re)量的(de)傳導,這即可(ke)提高(gao)殺菌效率,也避(bi)免(mian)了(le)加(jia)熱(re)殺菌時,由于氣體的(de)膨脹而使(shi)包(bao)裝容(rong)(rong)器(qi)破裂.