鋁箔袋(dai)抽(chou)真(zhen)(zhen)空(kong)(kong)(kong)。為(wei)(wei)使包(bao)裝(zhuang)內氧降至(zhi)最(zui)低，應有較大的(de)真(zhen)(zhen)空(kong)(kong)(kong)度(du)(du)。一(yi)般(ban)(ban)要(yao)求腔室(shi)內真(zhen)(zhen)空(kong)(kong)(kong)度(du)(du)為(wei)(wei)10至(zhi)30torr。對于腔室(shi)式機(ji)，一(yi)般(ban)(ban)以0.15至(zhi)0.3MPa為(wei)(wei)宜。壓力過(guo)小，則因腔室(shi)大，充(chong)(chong)氣慢，充(chong)(chong)氣量不足；壓力過(guo)大，則包(bao)裝(zhuang)袋(dai)可能脹破(po)。一(yi)般(ban)(ban)充(chong)(chong)氣后 包(bao)裝(zhuang)袋(dai)內壓力以不大于0.12MPa為(wei)(wei)宜。 充(chong)(chong)氣時間也依(yi)袋(dai)容(rong)積而定，以袋(dai)飽滿為(wei)(wei)原則。鋁箔袋(dai)真(zhen)(zhen)空(kong)(kong)(kong)包(bao)裝(zhuang)機(ji)抽(chou)真(zhen)(zhen)空(kong)(kong)(kong)后，鋁箔袋(dai)包(bao)裝(zhuang)內難以做到絕對無氧。經測定，包(bao)裝(zhuang)內還有1.6%至(zhi)2.2%的(de)O2。如(ru)果包(bao)裝(zhuang)內還有2%至(zhi)5% O2 ,則霉菌、酵母的(de)繁育基(ji)本同(tong)在空(kong)(kong)(kong)氣中一(yi)樣。 

抽真空時間據產品對真空度要求(qiu)和包(bao)裝容積。經實驗確定(ding)。氣泡袋充氣。氣泡袋引入充氣包(bao)裝機(ji)的混(hun)合氣體要有一(yi)定(ding)的壓力(li)。