Kodi Pepala Lopaka Mafuta la PE Ndi Loopsa? Kusanthula Kwathunthu kwa Miyezo Yovomerezeka ndi Zowona Zasayansi
Pepala lopangidwa ndi PE, yomwe imagwiritsidwa ntchito kwambiri poika chakudya ndi zinthu zina zomwe zimagwiritsidwa ntchito tsiku ndi tsiku, nthawi zonse yakhala ikukopa chidwi cha ogula pankhani ya chitetezo chake, ndipo funso lalikulu likuyang’ana pa “Kodi Pepala Lopaka Mafuta la PE poizoni?”. Kutengera miyezo yapadziko lonse lapansi komanso yapadziko lonse lapansi komanso deta yoyesera akatswiri, yankho lake ndi lomveka bwino: Pepala lopangidwa ndi PE lomwe limakwaniritsa miyezo yovomerezeka silivulaza thupi la munthu ngati likugwiritsidwa ntchito moyenera; zoopsa zachitetezo zitha kukhalapo pokhapokha ngati chinthucho sichikutsatira malamulo kapena chikugwiritsidwa ntchito m’malo osakhazikika.
Kapangidwe ka pepala lopangidwa ndi PE ndikuphimba polyethylene (PE) pansi pa pepalalo kudzera mu njira yosungunuka ndi kutentha. Polyethylene yokha ndi chinthu chosagwira ntchito chomwe chili ndi mankhwala okhazikika, chomwe chadziwika ndi mabungwe ambiri apadziko lonse lapansi ngati chinthu chotetezeka chokhudzana ndi chakudya. Muyezo wa dziko lonse wa GB/T 36392-2018 “Laminated Paper and Board for Food Packaging” wa ku China umafotokoza momveka bwino kuti kusamuka konse kwa PE laminated pepala la chakudyaKukhudzana kuyenera kukhala ≤10 mg/dm², kuchuluka kwa lead yachitsulo cholemera (Pb) kuyenera kukhala ≤3 mg/kg, cadmium (Cd) ≤0.2 mg/kg, ndipo palibe zinthu zoopsa monga zowunikira za fluorescent zomwe ziyenera kupezeka. US FDA imalamulira mosamalitsa zinthu zokutira za PE kuti zigwirizane ndi chakudya kudzera mu 21 CFR 177.1520, zomwe zimafuna kuti zinthu zomwe zimasamuka zikwaniritse zofunikira zachitetezo.
Pali zinthu ziwiri zofunika kwambiri zomwe zimakhudza chitetezo cha pepala lopangidwa ndi PE. Choyamba, kutsatira malamulo a malonda: Pepala lopangidwa ndi PE lopangidwa ndi opanga osavomerezeka lingagwiritse ntchito zinyalala zobwezerezedwanso, zipangizo zopanda PE, kapena kuwonjezera mapulasitiki oletsedwa monga ma phthalates, zomwe zimayambitsa kusamuka kwa zinthu zovulaza. Chachiwiri, zochitika zogwiritsidwa ntchito: Malo osungunuka a PE ndi pafupifupi 120-130℃. Kutentha kwa ntchito kukapitirira 110℃ (monga kutentha mwachindunji mu uvuni wa microwave kapena kukhudzana ndi malawi otseguka), kapena kukakhudzana ndi chakudya chamafuta chotentha kwambiri kwa nthawi yayitali, kungathandize kuti zinthu zovulaza zisamuke mofulumira. Deta yofufuza ikuwonetsa kuti kuwonjezeka kwa mphamvu ya microwave ndi kutentha kumawonjezera kwambiri kuchuluka kwa kusamuka kwa mapulasitiki mu pepala lopangidwa ndi PE, pomwe mphamvu ya microwave imakhala ndi zotsatira zoonekeratu, zomwe zitha kuwonjezera kuchuluka kwa kusamuka ndi 20%.
Kuti muwonetsetse kuti mukugwiritsa ntchito bwino, ogula ndi ogula ayenera kulabadira mfundo zitatu: Choyamba, sankhani zinthu zomwe zili ndi ziphaso zovomerezeka, monga pepala lopangidwa ndi PE lomwe lapambana satifiketi ya FDA ndipo likukwaniritsa miyezo ya GB 4806, ndikuyang’ana malipoti oyesera ndi ziphaso zovomerezeka zomwe wopanga adapereka. Chachiwiri, tsatirani malangizo ogwiritsira ntchito: pewani kutentha chakudya chomwe chapakidwa mu pepala lopangidwa ndi PE mu uvuni wa microwave, ndipo musachigwiritse ntchito kusunga chakudya chotentha kwambiri chopitirira 100℃. Pomaliza, perekani zinthu zomwe zili ndi Virgin Wood Pulp Zipangizo zoyambira ndi njira zoyeretsera madzi, zomwe sizimangokhala ndi chitetezo chabwino komanso zimachepetsa mpweya woipa wa VOC ndipo ndizosamalira chilengedwe.
Monga katswiri wopereka mayankho a zinthu zamapepala, Paperjoy’sZinthu zopangidwa ndi pepala lopangidwa ndi PE zimagwiritsa ntchito zipangizo zopangira chakudya zomwe sizili ndi vuto la chakudya komanso zinthu zopangira matabwa zovomerezeka ndi FSC, zimatsatira njira zopangira zoyera, zimapambana ziphaso zambiri zovomerezeka monga FDA ndi ISO9001, ndipo gulu lililonse la zinthu lili ndi malipoti athunthu oyesa kuti zitsimikizire kuti zimagwiritsidwa ntchito bwino m’mapaketi a chakudya, zinthu zogwiritsidwa ntchito pophika ndi zina.
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