鋁箔(bo)(bo)袋(dai)抽(chou)(chou)真(zhen)(zhen)(zhen)空(kong)(kong)。為(wei)使包裝(zhuang)(zhuang)內(nei)(nei)氧降至(zhi)最低，應有(you)較大的真(zhen)(zhen)(zhen)空(kong)(kong)度。一(yi)般要求腔室內(nei)(nei)真(zhen)(zhen)(zhen)空(kong)(kong)度為(wei)10至(zhi)30torr。對于(yu)腔室式機，一(yi)般以0.15至(zhi)0.3MPa為(wei)宜。壓力過小，則因腔室大，充(chong)(chong)(chong)(chong)氣(qi)(qi)慢，充(chong)(chong)(chong)(chong)氣(qi)(qi)量不(bu)足；壓力過大，則包裝(zhuang)(zhuang)袋(dai)可能(neng)脹破。一(yi)般充(chong)(chong)(chong)(chong)氣(qi)(qi)后 包裝(zhuang)(zhuang)袋(dai)內(nei)(nei)壓力以不(bu)大于(yu)0.12MPa為(wei)宜。 充(chong)(chong)(chong)(chong)氣(qi)(qi)時間也依袋(dai)容(rong)積而定(ding)，以袋(dai)飽(bao)滿為(wei)原則。鋁箔(bo)(bo)袋(dai)真(zhen)(zhen)(zhen)空(kong)(kong)包裝(zhuang)(zhuang)機抽(chou)(chou)真(zhen)(zhen)(zhen)空(kong)(kong)后，鋁箔(bo)(bo)袋(dai)包裝(zhuang)(zhuang)內(nei)(nei)難以做到(dao)絕對無氧。經測定(ding)，包裝(zhuang)(zhuang)內(nei)(nei)還有(you)1.6%至(zhi)2.2%的O2。如果包裝(zhuang)(zhuang)內(nei)(nei)還有(you)2%至(zhi)5% O2 ,則霉菌、酵母的繁育(yu)基本同在空(kong)(kong)氣(qi)(qi)中一(yi)樣(yang)。 

抽(chou)真空時間(jian)據產品對真空度要求和包裝容積。經實(shi)驗確定。氣(qi)泡(pao)袋(dai)充氣(qi)。氣(qi)泡(pao)袋(dai)引(yin)入充氣(qi)包裝機的混(hun)合(he)氣(qi)體要有一定的壓力。