真空(kong)包裝的一種變種是(shi)充氣(qi)包裝。充氣(qi)包裝(zhuang)的主要作(zuo)用(yong)(yong)(yong)除真(zhen)空包(bao)(bao)裝(zhuang)(zhuang)所(suo)具備的除氧保質功能外,主要還有(you)抗壓、阻氣、保鮮等作(zuo)用(yong)(yong)(yong),能更有(you)效 地使食(shi)(shi)(shi)品(pin)長期保持原有(you)的色、香、味、形(xing)及營養(yang)價(jia)值。另外,有(you)許多食(shi)(shi)(shi)品(pin)不宜(yi)采用(yong)(yong)(yong)真(zhen)空包(bao)(bao)裝(zhuang)(zhuang),而必須(xu)采用(yong)(yong)(yong)充氣包(bao)(bao)裝(zhuang)(zhuang)。如松脆易碎食(shi)(shi)(shi)品(pin)、易結塊食(shi)(shi)(shi)品(pin)、易變(bian)形(xing)走油食(shi)(shi)(shi)品(pin)、有(you)尖銳棱(leng)角或硬(ying)度較高會刺破包(bao)(bao)裝(zhuang)(zhuang)袋的食(shi)(shi)(shi)品(pin)等。食(shi)(shi)(shi)品(pin)經食品真(zhen)空包裝機(ji)抽氣包裝(zhuang)(zhuang)后,充入(ru)一些氣體,使包裝(zhuang)(zhuang)袋內充氣壓(ya)強(qiang)大(da)(da)于包裝(zhuang)(zhuang)袋外大(da)(da)氣壓(ya)強(qiang),能(neng)有(you)效地防(fang)止食品受壓(ya)破(po)碎變形,并不(bu)影響(xiang)包裝(zhuang)(zhuang)袋外觀(guan)及印刷裝(zhuang)(zhuang)潢。
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