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nkhani

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 komanso alibe logo ya Chitchaina.Komanso, onetsetsani kuti mwasankha mankhwala olembedwa ndi mawu akuti "chakudya".

Pali mitundu iwiri ikuluikulu ya filimu yodyera: polyethylene (PE) ndi polypropylene (PP).Kusiyanitsa kwamitengo pakati pa zinthu ziwirizi sikwabwino, koma polypropylene (PP) ndikwabwino 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 imakhala ndi mphamvu zosunga chinyezi komanso imakhala ndi nthawi yayitali kwambiri yamitundu itatu ya filimu yotsatsira.Polyvinyl kolorayidi (PVC) cling filimu ndi kusankha kwa anthu ambiri chifukwa cha bwino transparency, 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 zili ndi mchere wamchere wotsogola zimatulutsa lead zikakumana ndi ethanol, etha ndi zosungunulira zina.PVC munali mchere mchere ntchito ma CD chakudya ndi donuts, chofufumitsa chokazinga, nsomba yokazinga, nyama yophika, makeke ndi zokhwasula-khwasula kukumana, zidzachititsa mamolekyu kutsogolera diffuse mu mafuta, kotero inu simungagwiritse ntchito PVC matumba apulasitiki chakudya munali mafuta.Kuphatikiza apo, palibe Kutentha kwa microwave, palibe kugwiritsa ntchito kutentha kwambiri.Chifukwa zinthu zapulasitiki za PVC zimawola 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.

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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.Ma gramu 100 a radish atakulungidwa mu pulasitiki amasungidwa kwa tsiku limodzi, ndipo vitamini C yake inachepetsedwa ndi 3.4 mg, nyemba ya 3.8 mg, ndipo nkhaka imasungidwa kwa usana ndi usiku, ndipo kutaya 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’kati mwake amatha kusanduka nthunzi n’kusungunuka m’chakudyacho, zomwe zingawononge thanzi.Mafilimu ambiri omangirira omwe amagulitsidwa pamsika amapangidwa kuchokera ku vinyl masterbatch yomweyi monga matumba apulasitiki omwe amagwiritsidwa ntchito nthawi zambiri.Zida zina zomangira filimu ndi polyethylene (PE), yomwe ilibe mapulasitiki ndipo imakhala yotetezeka kuti igwiritsidwe 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