真空(kong)包裝的一種變種是充氣包裝。充(chong)氣包(bao)裝的主要(yao)作用(yong)除真(zhen)空包裝所具備(bei)的除氧保(bao)質功能(neng)外,主要(yao)還有(you)抗(kang)壓、阻氣(qi)、保(bao)鮮等作用(yong),能(neng)更有(you)效 地使食(shi)(shi)(shi)品長期保(bao)持原有(you)的色、香、味、形(xing)及營(ying)養價值(zhi)。另外,有(you)許(xu)多食(shi)(shi)(shi)品不宜采(cai)用(yong)真(zhen)空包裝,而必(bi)須采(cai)用(yong)充(chong)氣(qi)包裝。如松脆易(yi)碎食(shi)(shi)(shi)品、易(yi)結塊食(shi)(shi)(shi)品、易(yi)變形(xing)走油(you)食(shi)(shi)(shi)品、有(you)尖(jian)銳棱角或硬(ying)度較高(gao)會刺(ci)破包裝袋(dai)的食(shi)(shi)(shi)品等。食(shi)(shi)(shi)品經(jing)食品真空(kong)包裝機抽氣包(bao)裝(zhuang)后,充(chong)入(ru)一些氣體,使包(bao)裝(zhuang)袋內充(chong)氣壓(ya)強大(da)于包(bao)裝(zhuang)袋外(wai)大(da)氣壓(ya)強,能有效地(di)防(fang)止食(shi)品受壓(ya)破碎變形(xing),并不影響包(bao)裝(zhuang)袋外(wai)觀及印刷裝(zhuang)潢。
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