真空包裝的一種(zhong)變種(zhong)是充氣包裝。充氣包裝的主(zhu)要作(zuo)用(yong)(yong)除(chu)真空(kong)(kong)包(bao)(bao)裝所具備的除(chu)氧保(bao)質(zhi)功能外，主(zhu)要還(huan)有(you)抗(kang)壓、阻(zu)氣、保(bao)鮮等作(zuo)用(yong)(yong)，能更(geng)有(you)效 地使食(shi)(shi)品(pin)(pin)長期保(bao)持原有(you)的色、香、味(wei)、形(xing)(xing)及營養價值。另外，有(you)許多食(shi)(shi)品(pin)(pin)不(bu)宜采(cai)用(yong)(yong)真空(kong)(kong)包(bao)(bao)裝，而必(bi)須(xu)采(cai)用(yong)(yong)充(chong)氣包(bao)(bao)裝。如松(song)脆易碎食(shi)(shi)品(pin)(pin)、易結塊(kuai)食(shi)(shi)品(pin)(pin)、易變形(xing)(xing)走油食(shi)(shi)品(pin)(pin)、有(you)尖銳棱角或硬(ying)度較高會刺破包(bao)(bao)裝袋的食(shi)(shi)品(pin)(pin)等。食(shi)(shi)品(pin)(pin)經(jing)食品真(zhen)空包裝機(ji)抽(chou)氣包(bao)裝后，充入一些(xie)氣體，使包(bao)裝袋(dai)內充氣壓(ya)強(qiang)(qiang)大于(yu)包(bao)裝袋(dai)外大氣壓(ya)強(qiang)(qiang)，能有效地防止食(shi)品受壓(ya)破碎(sui)變形，并不影(ying)響包(bao)裝袋(dai)外觀(guan)及印刷裝潢。