Pokhala ndi zakudya zochepa za ziweto zomwe zimalowa pamsika, chakudya cha ziweto nthawi zonse chimakhala chimodzi mwamakampani omwe amapikisana nawo kwambiri.
Njira zodalirika zikufunika kwambiri kuti zitsimikizire ndikukulitsa moyo wa alumali wa chakudya cha ziweto.
Mofanana ndi chakudya cha anthu, chakudya cha ziweto chiyenera kuonetsetsa kuti chikugwirizana ndi moyo ndi thanzi la ziweto.
Chifukwa chake, chakudya cha ziweto chiyenera kukhala ndi zakudya zofunikira komanso kukoma koyambirira mkati mwa kubereka, kukonza komanso moyo wa alumali.
Zosungirako zakhala zikugwiritsidwa ntchito kwa zaka mazana ambiri.
Iwo akhoza kukhala.
Mankhwala oteteza tizilombo toyambitsa matenda omwe amalepheretsa kukula kwa mabakiteriya ndi bowa, kapena ma antioxidants omwe amalepheretsa okosijeni wa zakudya, monga zotengera mpweya. Common anti-
Zosungirako za microbial zimaphatikizapo C-calcium, sodium nitrate, nitrite, ndi sulfuric acid (
Sulfur dioxide, sodium bisultan, potaziyamu bisultan, etc.)
Ndipo disodium.
Antioxidants ndi BHA ndi BHT.
Zosungirako zakudya zimagawidwa kukhala: zosungira zachilengedwe monga mchere, shuga, viniga, madzi, zonunkhira, uchi, mafuta odyera, ndi zina zotero;
Ndipo zotetezera mankhwala monga sodium kapena potaziyamu, sulphate, glutamate, gan grease, etc.
Komabe, zotsatira za mankhwala opangira mankhwala pazakudya za ziweto ndizovuta kwambiri kuposa zoteteza zachilengedwe.
Pankhani ya mtundu ndi kuchuluka kwa chakudya cha ziweto, pali malamulo okhwima kwambiri.
Zikuchulukirachulukira kuti opanga azidalira zoteteza kuti zitsimikizire moyo wa alumali.
Kugwiritsiridwa ntchito kwa zinthu zotchinga kwambiri monga kuyika chakudya cha ziweto kumathandizanso kwambiri kuonetsetsa ndikukulitsa moyo wa alumali wa chakudya cha ziweto.
Ndizodziwika bwino kuti kukula kwa tizilombo toyambitsa matenda kumafuna malo abwino.
Kutentha, mpweya ndi madzi ndi zinthu zitatu zofunika kwambiri.
Oxygen ndi amene amachititsa kuti chakudya chiwole.
Kuchepa kwa okosijeni m'paketi yazakudya, m'pamenenso chakudya chitha kuola.
Ngakhale kuti madzi amapereka malo okhala kwa tizilombo toyambitsa matenda, amathanso kufulumizitsa kuchepetsa mafuta;
Kufupikitsa moyo wa alumali wa chakudya cha ziweto.
Panthawi ya alumali ya chakudya cha ziweto, mpweya ndi nthunzi wamadzi mu phukusi ziyenera kusungidwa zisanachitike.
Permeability ndikutha kuyeza mpweya wololedwa ndi zida zotchinga (
O2, N2, CO2, mpweya wamadzi, etc.)
Lowani m'menemo panthawi yake.
Nthawi zambiri zimadalira mtundu, kupanikizika, kutentha ndi makulidwe azinthu.
Mu labu ya Labthink, tidayesa, kusanthula ndi OPP/PE/CPP, kuchuluka kwa oxygen kutengera komanso kuchuluka kwa nthunzi wamadzi kwa 7 omwe amagwiritsidwa ntchito kwambiri ponyamula chakudya cha ziweto PET, pet CPP, Bopp/CPP, BOPET/PE/VMPET/dlp.
Kuchuluka kwa mpweya wa okosijeni kumatanthauza kuti mpweya wa oxygen umachepetsa;
Kuchuluka kwa mpweya wa madzi kumatanthauza kuti mpweya wamadzi umakhala wochepa.
Mayeso opereka okosijeni amatengera njira yoyesera ya Labthink OX2/230 yotulutsa mpweya, njira yofanana yokakamiza.
Ikani zitsanzo pamalo okhazikika musanayesedwe (23 ± 2 ℃, 50% RH)
Kwa maola 48, mpweya wabwino pamwamba pa chitsanzo.
Mayeso a kuchuluka kwa mpweya wa madzi amagwiritsa ntchito njira yoyesera ya Labthink/030 vapor transmission rate ndi njira yachikhalidwe ya Cup Cup.
Zotsatira zatsatanetsatane za mayeso a OTR ndi WVTR a zinthu zolongedza 7zi ndi motere: zotsatira za mayeso OTR (ml/m2/tsiku)WVTR (g/m2/24h)PET/CPP 0. 895 0.
667 BOPP/CPP 601. 725 3. 061 PET 109. 767 25.
BOPET/PE 85 163. 055 4.
632 OPP/PE/CPP 716. 226 2.
214 BOPET/VMPET/hdpe 0. 149 0. 474 Aluminiyamu-pulasitiki 0. 282 0.
187 Table 1 kuchokera kuwunika kwa zotsatira za mayeso a 7 zipangizo zonyamula katundu, deta yoyesera ya permeability ya Pet chakudya ma CD angapezeke, ndipo tikhoza kupeza kuti zipangizo zosiyanasiyana laminated adzakhala ndi kusiyana kwambiri permeability mpweya.
Kuchokera pa tebulo 1, aluminiyamu-
Mitengo yotengera okosijeni pazinthu zapulasitiki, BOPET/VMPET/dlp, PET/CPP ndizochepa.
Malinga ndi kafukufuku wathu, chakudya cha ziweto chomwe chili mu phukusili nthawi zambiri chimakhala ndi nthawi yayitali.
Filimu yopangidwa ndi laminated imakhala ndi ntchito yabwino poletsa nthunzi yamadzi.
Onani chithunzi chomwe chili pansipa, PET ili ndi kuchuluka kwa mpweya wamadzi, zomwe zikutanthauza kuti chotchinga chake cha nthunzi chamadzi sichigwira ntchito bwino ndipo sichiyenera kulongedza chakudya cha PET chifukwa chimafupikitsa moyo wa alumali wa chakudya cha PET.
Opanga zakudya zoweta atha kugwiritsa ntchito zida zotchinga kwambiri m'malo mowonjezera zoteteza kuti ziwonjezere moyo wa alumali wa chakudya cha ziweto.
Timalimbikitsa pulasitiki laminated, aluminiyamu-
Zida za pulasitiki ndi zitsulo zimayikidwa ngati chakudya cha ziweto chifukwa zonse zimakhala ndi chotchinga chabwino cha mpweya ndi mpweya wa madzi.
Kuwonjezera pa kulingalira za mpweya ndi mpweya permeability katundu wa zinthu, tiyeneranso kudziwa kuti chilengedwe ali ndi chikoka pa zinthu zimenezi.
Monga EVOH ndi PA, amakhudzidwa kwambiri ndi chinyezi.
Kutentha kwa chipinda ndi chinyezi chochepa, zonsezi zimakhala ndi zotsatira zabwino zotsekereza nthunzi yamadzi, pomwe mpweya wawo wamadzi umachepa m'malo achinyezi.
Chifukwa chake, EVOH ndi PA sizoyenera kulongedza ngati pamakhala chinyezi chambiri panthawi yonyamula ndi kukonza chakudya cha ziweto.
