真(zhen)(zhen)空(kong)充(chong)(chong)氣(qi)包裝(zhuang)的主(zhu)要(yao)作用(yong)除真(zhen)(zhen)空(kong)包裝(zhuang)所(suo)具備的除氧保質功(gong)能(neng)外，主(zhu)要(yao)還有(you)(you)抗壓、阻氣(qi)、保鮮(xian)等作用(yong)，能(neng)更(geng)有(you)(you)效地(di)使食(shi)品(pin)長(chang)期(qi)保持(chi)原有(you)(you)的色、香、味、形(xing)(xing)及(ji)(ji)營養價值(zhi)。另外，有(you)(you)許多食(shi)品(pin)不(bu)適宜采用(yong)真(zhen)(zhen)空(kong)包裝(zhuang)而必(bi)須采用(yong)真(zhen)(zhen)空(kong)包裝(zhuang)機真(zhen)(zhen)空(kong)充(chong)(chong)氣(qi)包裝(zhuang)。如松脆(cui)易(yi)碎食(shi)品(pin)，易(yi)結塊食(shi)品(pin)，易(yi)變(bian)(bian)形(xing)(xing)走油食(shi)品(pin)，有(you)(you)尖銳棱角或(huo)硬度較(jiao)高會刺破包裝(zhuang)袋(dai)(dai)的食(shi)品(pin)等。食(shi)品(pin)經真(zhen)(zhen)空(kong)充(chong)(chong)氣(qi)包裝(zhuang)后，包裝(zhuang)袋(dai)(dai)內充(chong)(chong)氣(qi)壓強大于包裝(zhuang)袋(dai)(dai)外大氣(qi)壓強，能(neng)有(you)(you)效地(di)防止食(shi)品(pin)受壓破碎變(bian)(bian)形(xing)(xing)并不(bu)影響(xiang)包裝(zhuang)袋(dai)(dai)外觀及(ji)(ji)印刷裝(zhuang)潢。