真空(kong)包(bao)裝的一(yi)種變(bian)種是充氣包(bao)裝。充氣包裝的主(zhu)要作用(yong)(yong)除真空包(bao)(bao)裝(zhuang)所具備的除氧(yang)保質(zhi)功能外(wai),主(zhu)要還有(you)(you)抗壓、阻氣、保鮮等(deng)作用(yong)(yong),能更有(you)(you)效 地使食(shi)(shi)(shi)品(pin)長期保持原有(you)(you)的色、香(xiang)、味、形(xing)及營養價(jia)值。另外(wai),有(you)(you)許多食(shi)(shi)(shi)品(pin)不(bu)宜采(cai)用(yong)(yong)真空包(bao)(bao)裝(zhuang),而必須采(cai)用(yong)(yong)充氣包(bao)(bao)裝(zhuang)。如松脆易(yi)(yi)碎(sui)食(shi)(shi)(shi)品(pin)、易(yi)(yi)結塊食(shi)(shi)(shi)品(pin)、易(yi)(yi)變形(xing)走(zou)油(you)食(shi)(shi)(shi)品(pin)、有(you)(you)尖銳棱角或硬度(du)較高(gao)會刺破包(bao)(bao)裝(zhuang)袋(dai)的食(shi)(shi)(shi)品(pin)等(deng)。食(shi)(shi)(shi)品(pin)經食品真空(kong)包(bao)裝機抽氣(qi)包裝(zhuang)(zhuang)后,充入(ru)一些氣(qi)體(ti),使包裝(zhuang)(zhuang)袋(dai)內充氣(qi)壓強(qiang)大(da)于包裝(zhuang)(zhuang)袋(dai)外大(da)氣(qi)壓強(qiang),能有效地防(fang)止(zhi)食品受(shou)壓破碎變形,并不影響包裝(zhuang)(zhuang)袋(dai)外觀及印刷(shua)裝(zhuang)(zhuang)潢(huang)。
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