Momwe mungasankhire ndikugula
Pogula filimu yopangira chakudya kapena pulasitiki, onetsetsani kuti muyang'ane dzina linalake kapena kapangidwe ka mankhwala, ndipo samalani ngati mankhwalawa ali ndi dzina lachingelezi lokha ndipo alibe chizindikiro cha Chitchaina.Komanso, onetsetsani kuti mwasankha mankhwala olembedwa ndi mawu akuti "chakudya".
Pali mitundu iwiri ikuluikulu ya filimu yodyera: polyethylene (PE) ndi polypropylene (PP).Kusiyana kwamitengo pakati pa zinthu ziwirizi sikwabwino, koma polypropylene (PP) ndiyabwino kuletsa kulowa kwamafuta.
Pogula filimu yodyera, choyamba tikulimbikitsidwa kugula filimu yodzikongoletsera yokhayokha yopangidwa ndi polyethylene (PE), makamaka pankhani yosunga nyama, zipatso, ndi zina zotero, chifukwa PE ndi yotetezeka kwambiri pa chitetezo.Kwa nthawi yayitali ya alumali, polyvinyl chloride (PVDC) imalimbikitsidwa chifukwa ili ndi mphamvu zosungira chinyezi komanso imakhala ndi nthawi yayitali kwambiri yamitundu itatu ya filimu yotsatirira.Polyvinyl kolorayidi (PVC) cling film ndiyenso kusankha kwa anthu ambiri chifukwa cha bwino poyera, mamasukidwe akayendedwe, elasticity ndi mtengo wotsika mtengo, koma tisaiwale kuti sangathe ntchito kusunga mafuta chakudya chifukwa ndi utomoni wopangidwa polyvinyl kolorayidi. utomoni, plasticizer ndi antioxidant, amene palokha si poizoni.Komabe, mapulasitiki ndi ma antioxidants omwe amawonjezeredwa ndi poizoni.Mapulasitiki omwe amagwiritsidwa ntchito mu pulasitiki ya PVC kuti agwiritsidwe ntchito tsiku ndi tsiku makamaka ndi dibutyl terephthalate ndi dioctyl phthalate, zomwe ndi mankhwala oopsa.Izi zimawononga kwambiri dongosolo la endocrine laumunthu ndipo zimatha kusokoneza kagayidwe ka mahomoni m'thupi.Lead stearate, polyvinyl chloride antioxidant, ndi poizoni.Zogulitsa za PVC zomwe zimakhala ndi mchere wamchere wotsogola zimatulutsa lead zikakumana ndi ethanol, etha ndi zosungunulira zina.PVC yokhala ndi mchere wamchere womwe umagwiritsidwa ntchito ngati zopangira chakudya ndi ma donuts, mikate yokazinga, nsomba yokazinga, zinthu zophika nyama, makeke ndi zokhwasula-khwasula zimakumana, zipangitsa kuti mamolekyu atsogolere kufalikira mumafuta, kotero simungagwiritse ntchito matumba apulasitiki a PVC pazakudya zomwe zili ndi mafuta.Kuphatikiza apo, palibe kutentha kwa microwave, palibe kugwiritsa ntchito kutentha kwambiri.Chifukwa mapulasitiki a PVC amawola pang'onopang'ono mpweya wa hydrogen chloride pakatentha kwambiri, monga pafupifupi 50 ℃, ndipo mpweyawu ndi wovulaza thupi la munthu, chifukwa chake zinthu za PVC siziyenera kugwiritsidwa ntchito ngati zopangira chakudya.
Kuchuluka kwa ntchito
Mayesero amasonyeza kuti magalamu 100 a leek atakulungidwa mu pulasitiki, maola 24 pambuyo pake vitamini C ali ndi 1.33 mg kuposa pamene sanakulungidwe, ndi 1.92 mg wochuluka wa kugwiriridwa ndi masamba a letesi.Komabe, zotsatira zoyesera za masamba ena zinali zosiyana kwambiri.100 magalamu a radish atakulungidwa mu zokutira pulasitiki amasungidwa kwa tsiku, ndipo vitamini C yake idachepetsedwa ndi 3.4 mg, ufa wa nyemba ndi 3.8 mg, ndipo nkhaka idasungidwa usana ndi usiku, ndipo kutayika kwa vitamini C kunali kofanana ndi 5 maapulo.
Zakudya zophika, chakudya chotentha, chakudya chokhala ndi mafuta, makamaka nyama, ndibwino kuti musagwiritse ntchito posungira pulasitiki.Akatswiri amanena kuti zakudya zimenezi zikakumana ndi filimu ya chakudya, makemikolo amene ali m’zinthuzo amatha kutuluka nthunzi n’kusungunuka m’chakudyacho, zomwe zingawononge thanzi.Mafilimu ambiri omangirira omwe amagulitsidwa pamsika amapangidwa kuchokera ku vinyl masterbatch yomweyo monga matumba apulasitiki omwe amagwiritsidwa ntchito nthawi zambiri.Zida zina zomangira filimu ndi polyethylene (PE), zomwe zilibe mapulasitiki ndipo ndizotetezeka kuti zigwiritsidwe ntchito;zina ndi polyvinyl chloride (PVC), yomwe nthawi zambiri imaphatikizapo zokhazikika, mafuta odzola, mapurosesa othandizira ndi zipangizo zina zomwe zingakhale zovulaza anthu.Choncho, muyenera kusamala posankha.
Nthawi yotumiza: Mar-16-2022