真空(kong)包裝的(de)一種變種是充氣包裝。充(chong)氣包裝(zhuang)的主(zhu)要作用(yong)除真空包裝所具備的除氧保(bao)質功(gong)能外,主(zhu)要還(huan)有(you)(you)抗壓(ya)、阻氣(qi)、保(bao)鮮等(deng)作用(yong),能更有(you)(you)效 地使(shi)食(shi)(shi)(shi)(shi)品(pin)長期保(bao)持原有(you)(you)的色、香(xiang)、味、形(xing)及營養價值。另外,有(you)(you)許(xu)多食(shi)(shi)(shi)(shi)品(pin)不宜采(cai)用(yong)真空包裝,而(er)必須采(cai)用(yong)充氣(qi)包裝。如松脆易碎(sui)食(shi)(shi)(shi)(shi)品(pin)、易結塊食(shi)(shi)(shi)(shi)品(pin)、易變(bian)形(xing)走油食(shi)(shi)(shi)(shi)品(pin)、有(you)(you)尖銳棱角或硬度較(jiao)高會刺破(po)包裝袋(dai)的食(shi)(shi)(shi)(shi)品(pin)等(deng)。食(shi)(shi)(shi)(shi)品(pin)經食品真(zhen)空包裝機抽氣包(bao)裝(zhuang)后,充(chong)入一些氣體,使包(bao)裝(zhuang)袋內充(chong)氣壓(ya)強大于包(bao)裝(zhuang)袋外大氣壓(ya)強,能有(you)效地防止(zhi)食品受壓(ya)破碎變形,并不影(ying)響包(bao)裝(zhuang)袋外觀(guan)及印刷裝(zhuang)潢。
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