真(zhen)空包裝(zhuang)的一種變(bian)種是(shi)充氣包裝(zhuang)。充(chong)氣包裝(zhuang)的(de)(de)主(zhu)要作用(yong)(yong)(yong)除真(zhen)空包(bao)(bao)(bao)裝(zhuang)所(suo)具(ju)備的(de)(de)除氧保(bao)質(zhi)功能(neng)外,主(zhu)要還有(you)(you)抗(kang)壓、阻(zu)氣、保(bao)鮮等(deng)作用(yong)(yong)(yong),能(neng)更有(you)(you)效 地使食(shi)(shi)品(pin)(pin)長期保(bao)持原有(you)(you)的(de)(de)色、香、味、形(xing)及營養(yang)價值(zhi)。另外,有(you)(you)許(xu)多(duo)食(shi)(shi)品(pin)(pin)不宜(yi)采用(yong)(yong)(yong)真(zhen)空包(bao)(bao)(bao)裝(zhuang),而必(bi)須采用(yong)(yong)(yong)充氣包(bao)(bao)(bao)裝(zhuang)。如(ru)松脆(cui)易(yi)碎(sui)食(shi)(shi)品(pin)(pin)、易(yi)結塊食(shi)(shi)品(pin)(pin)、易(yi)變形(xing)走(zou)油(you)食(shi)(shi)品(pin)(pin)、有(you)(you)尖銳棱角或硬度較高會刺破包(bao)(bao)(bao)裝(zhuang)袋的(de)(de)食(shi)(shi)品(pin)(pin)等(deng)。食(shi)(shi)品(pin)(pin)經食(shi)品真空包裝(zhuang)機抽(chou)氣包(bao)裝(zhuang)后,充(chong)入一些氣體(ti),使包(bao)裝(zhuang)袋內充(chong)氣壓強大于(yu)包(bao)裝(zhuang)袋外大氣壓強,能有效(xiao)地防止食品受壓破(po)碎變(bian)形,并不影響包(bao)裝(zhuang)袋外觀(guan)及印刷裝(zhuang)潢。
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