真空(kong)包裝的一種變種是充氣包裝。充(chong)氣包裝(zhuang)的主要(yao)作用(yong)除真空包(bao)裝(zhuang)所具(ju)備的除氧保(bao)(bao)質功能(neng)外,主要(yao)還有(you)抗壓、阻氣、保(bao)(bao)鮮等(deng)作用(yong),能(neng)更有(you)效 地使食(shi)(shi)(shi)品(pin)(pin)長期保(bao)(bao)持原有(you)的色、香、味、形及營養價值。另外,有(you)許多食(shi)(shi)(shi)品(pin)(pin)不宜采用(yong)真空包(bao)裝(zhuang),而必須采用(yong)充氣包(bao)裝(zhuang)。如松(song)脆(cui)易(yi)碎食(shi)(shi)(shi)品(pin)(pin)、易(yi)結塊食(shi)(shi)(shi)品(pin)(pin)、易(yi)變形走油食(shi)(shi)(shi)品(pin)(pin)、有(you)尖銳棱角(jiao)或(huo)硬度較高會刺破包(bao)裝(zhuang)袋的食(shi)(shi)(shi)品(pin)(pin)等(deng)。食(shi)(shi)(shi)品(pin)(pin)經食品真空(kong)包裝機抽(chou)氣包(bao)(bao)(bao)裝后,充入一些氣體,使包(bao)(bao)(bao)裝袋(dai)(dai)內充氣壓強大(da)于包(bao)(bao)(bao)裝袋(dai)(dai)外大(da)氣壓強,能有效地防止(zhi)食(shi)品受壓破碎變(bian)形(xing),并不影響包(bao)(bao)(bao)裝袋(dai)(dai)外觀(guan)及印刷裝潢(huang)。
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