真(zhen)空(kong)充(chong)氣包(bao)(bao)裝(zhuang)的(de)主要(yao)(yao)作用(yong)除(chu)真(zhen)空(kong)包(bao)(bao)裝(zhuang)所具備的(de)除(chu)氧保質功能外，主要(yao)(yao)還有(you)抗壓、阻氣、保鮮(xian)等作用(yong)，能更(geng)有(you)效地(di)使食(shi)(shi)(shi)品(pin)(pin)長(chang)期保持(chi)原有(you)的(de)色、香、味(wei)、形(xing)及營(ying)養價值。另外，有(you)許多(duo)食(shi)(shi)(shi)品(pin)(pin)不(bu)適宜采(cai)(cai)用(yong)真(zhen)空(kong)包(bao)(bao)裝(zhuang)而必須采(cai)(cai)用(yong)真(zhen)空(kong)包(bao)(bao)裝(zhuang)機(ji)真(zhen)空(kong)充(chong)氣包(bao)(bao)裝(zhuang)。如松(song)脆易(yi)碎(sui)食(shi)(shi)(shi)品(pin)(pin)，易(yi)結塊食(shi)(shi)(shi)品(pin)(pin)，易(yi)變(bian)形(xing)走油(you)食(shi)(shi)(shi)品(pin)(pin)，有(you)尖銳棱角或硬度較高會(hui)刺破包(bao)(bao)裝(zhuang)袋的(de)食(shi)(shi)(shi)品(pin)(pin)等。食(shi)(shi)(shi)品(pin)(pin)經(jing)真(zhen)空(kong)充(chong)氣包(bao)(bao)裝(zhuang)后，包(bao)(bao)裝(zhuang)袋內充(chong)氣壓強大于包(bao)(bao)裝(zhuang)袋外大氣壓強，能有(you)效地(di)防止食(shi)(shi)(shi)品(pin)(pin)受壓破碎(sui)變(bian)形(xing)并不(bu)影響包(bao)(bao)裝(zhuang)袋外觀及印刷裝(zhuang)潢。