真空包裝的一種變種是充氣包裝。充(chong)氣(qi)包裝(zhuang)的主(zhu)(zhu)要(yao)作用(yong)(yong)(yong)除真(zhen)(zhen)空包裝(zhuang)(zhuang)所具備的除氧保質功能(neng)外,主(zhu)(zhu)要(yao)還有(you)抗壓、阻氣(qi)、保鮮等作用(yong)(yong)(yong),能(neng)更有(you)效 地(di)使食(shi)品(pin)長期保持(chi)原有(you)的色、香、味、形及營養價(jia)值(zhi)。另(ling)外,有(you)許多食(shi)品(pin)不宜采(cai)用(yong)(yong)(yong)真(zhen)(zhen)空包裝(zhuang)(zhuang),而必須采(cai)用(yong)(yong)(yong)充氣(qi)包裝(zhuang)(zhuang)。如松脆易碎食(shi)品(pin)、易結塊(kuai)食(shi)品(pin)、易變形走油食(shi)品(pin)、有(you)尖銳棱角或硬度(du)較高(gao)會(hui)刺破包裝(zhuang)(zhuang)袋(dai)的食(shi)品(pin)等。食(shi)品(pin)經(jing)食(shi)品真空包裝機抽氣(qi)包(bao)(bao)裝后,充(chong)入一些氣(qi)體,使包(bao)(bao)裝袋(dai)(dai)內充(chong)氣(qi)壓強大于(yu)包(bao)(bao)裝袋(dai)(dai)外大氣(qi)壓強,能有效(xiao)地防止食(shi)品(pin)受壓破碎變形,并不影響包(bao)(bao)裝袋(dai)(dai)外觀(guan)及印(yin)刷裝潢。
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