為了保持蔬菜水果在儲運、銷售過程中的鮮度,近年來相關企業和科研單位加大研發力度,相繼推出了一批能為水果蔬菜保鮮的"新式武器"。目前市場比較看好的"新式武器"有:
抗菌性薄膜抗菌性薄膜是將具有抗菌性的銀沸石混入薄膜內,銀沸石為具有抗菌性的銀與沸石結晶結構中的鈉離子置換或銀離子與用鋁、矽為原料的合成混合物。主要用PE、PP和PS作為基材。這種薄膜能夠在一定程度上抑製細菌的繁殖,起到保鮮作用。
功gong能neng性xing保bao鮮xian膜mo傳chuan統tong的de薄bo膜mo雖sui然ran能neng起qi到dao包bao裝zhuang的de作zuo用yong,具ju有you一yi定ding的de保bao鮮xian效xiao果guo,但dan已yi明ming顯xian不bu能neng滿man足zu現xian代dai市shi場chang的de保bao鮮xian需xu要yao。因yin此ci,大da量liang的de新xin型xing保bao鮮xian膜mo被bei研yan製zhi出chu來lai。這zhe些xie功gong能neng性xing保bao鮮xian膜mo不bu僅jin具ju有you以yi往wang薄bo膜mo防fang止zhi水shui分fen蒸zheng發fa、簡jian單dan控kong製zhi氣qi體ti的de效xiao應ying,而er且qie進jin一yi步bu提ti高gao了le蔬shu菜cai水shui果guo的de鮮xian度du。它ta們men是shi乙yi烯xi吸xi附fu薄bo膜mo,乙yi烯xi吸xi附fu薄bo膜mo是shi為wei了le除chu去qu有you害hai的de乙yi烯xi氣qi體ti,在zai塑su料liao薄bo膜mo中zhong混hun入ru氣qi體ti吸xi附fu性xing多duo孔kong物wu質zhi,如ru凝ning灰hui石shi、沸石、石英石、矽石、黏土礦物、石shi粉fen等deng微wei粉fen末mo,其qi大da部bu分fen能neng吸xi附fu乙yi烯xi或huo隔ge斷duan遠yuan紅hong外wai線xian輻fu射she。目mu前qian在zai國guo外wai,凝ning灰hui石shi係xi的de薄bo膜mo使shi用yong較jiao多duo,主zhu要yao是shi添tian加jia矽gui酸suan鹽yan類lei陶tao瓷ci,效xiao果guo較jiao好hao。
防露薄膜蔬菜水果用的保鮮膜,一般為氣體透過性高的低密度聚乙烯、聚丙稀、聚苯乙烯、乙烯-cusuanyixigongjuwujijulvyixidengshuzhizhichengdebomo。yongzhexiebomobaozhuangdeshucaishuiguochanshengdeshuizhengqizaibomoneibiaomianyijielu,bujinshiqitoumingxingjiangdi,erqieshuidijuji,shidexijunfanzhikuai,zaochengshucaishuiguofubai。fanglubomozeshishiyongjiemianhuoxingjichulishangshudejuyixi、聚丙烯等材料的內表麵,使其可吸收過剩的水分,能適度維持包裝內濕度,以達到防腐、保鮮的目的。既可作食品添加劑,又可作防露劑的物質是脂肪酸酯。
保鮮托盤保鮮托盤是對連續擠壓的原板(熱可塑性樹脂薄板)加(jia)熱(re)後(hou),通(tong)過(guo)真(zhen)空(kong)成(cheng)型(xing)和(he)衝(chong)壓(ya)成(cheng)型(xing)而(er)得(de)。使(shi)用(yong)托(tuo)盤(pan)除(chu)了(le)能(neng)夠(gou)防(fang)止(zhi)新(xin)鮮(xian)食(shi)品(pin)被(bei)損(sun)壞(huai)外(wai),還(hai)具(ju)有(you)一(yi)定(ding)的(de)隔(ge)熱(re)性(xing)。所(suo)謂(wei)新(xin)型(xing)托(tuo)盤(pan)是(shi)在(zai)原(yuan)板(ban)中(zhong)加(jia)入(ru)功(gong)能(neng)性(xing)薄(bo)膜(mo)或(huo)長(chang)纖(xian)維(wei)無(wu)紡(fang)布(bu)等(deng)重(zhong)疊(die)而(er)成(cheng)的(de)模(mo)壓(ya)品(pin)。這(zhe)種(zhong)托(tuo)盤(pan)在(zai)原(yuan)有(you)功(gong)能(neng)的(de)基(ji)礎(chu)上(shang)增(zeng)加(jia)調(tiao)節(jie)濕(shi)度(du)、控製氣體含量、防止黴菌繁殖等功能,所以能夠保持水果新鮮度,這種托盤能夠減少吸收水分引起的包裝尺寸變化。
功能型保鮮瓦楞紙箱低溫儲藏是目前食品保鮮的有效手段。具有隔熱功能的瓦楞紙箱,就是在傳統箱內、waibaozhuangchenshangfuheshuzhihelvzhengdumo,huozaizhixinzhongjiarufapaoshuzhi。shiqijuyouyouliangdegerexing,fangzhizailiutongtuzhongshucaishuiguozishenwendudeshenggao,dadaobaoxiandemude。juyoukongzhiqitigongnengdewalengzhixiang,zhezhongwalengzhixiangshizaizhixiangneichenhewaichenzhongjiajinbaoxianmohuozaizaozhijieduanhunrunengxifuyixiqitideduokongzhifenmo,shiqijuyouqitizugexing。fangzhishucaishuiguodeshuifenbufenzhengfa,qudekongzhiqitihanliangdexiaoguo,congerbaochishucaishuiguodexiandu。
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