真空(kong)包(bao)裝的一種(zhong)(zhong)變種(zhong)(zhong)是(shi)充氣(qi)包(bao)裝。充(chong)氣包裝的(de)主要作(zuo)用(yong)除真空包(bao)(bao)(bao)裝(zhuang)所(suo)具備的(de)除氧保質功能外,主要還有(you)抗(kang)壓、阻氣(qi)(qi)、保鮮等(deng)作(zuo)用(yong),能更有(you)效 地使食(shi)(shi)品長期保持原有(you)的(de)色、香(xiang)、味(wei)、形(xing)及營養價值。另外,有(you)許(xu)多食(shi)(shi)品不宜采用(yong)真空包(bao)(bao)(bao)裝(zhuang),而必須(xu)采用(yong)充氣(qi)(qi)包(bao)(bao)(bao)裝(zhuang)。如松(song)脆易碎食(shi)(shi)品、易結塊(kuai)食(shi)(shi)品、易變形(xing)走油食(shi)(shi)品、有(you)尖銳棱角或硬度(du)較(jiao)高會刺破(po)包(bao)(bao)(bao)裝(zhuang)袋的(de)食(shi)(shi)品等(deng)。食(shi)(shi)品經食品真空包裝機抽氣包(bao)裝(zhuang)后,充入一些氣體,使包(bao)裝(zhuang)袋內充氣壓(ya)(ya)強大于包(bao)裝(zhuang)袋外大氣壓(ya)(ya)強,能有(you)效(xiao)地(di)防止食品受壓(ya)(ya)破碎變(bian)形,并(bing)不影(ying)響包(bao)裝(zhuang)袋外觀及印刷裝(zhuang)潢。
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