1. Kodi pepala la PVC ndi chiyani?
Pepala la PVC ndi chinthu cha polima chopangidwa kuchokera ku vinyl chloride ngati maziko a zinthu zopangira, chokhala ndi zolimbitsa thupi, mafuta odzola, ndi zodzaza. Chimaonetsa ntchito yabwino kwambiri yolimbana ndi ma antioxidants, kukana kwambiri ma acid ndi redox reactions, mphamvu yayikulu, kukhazikika bwino, komanso kusayaka, zomwe zimapangitsa kuti chizitha kupirira kuwonongeka ndi kusintha kwa nyengo. Mitundu yodziwika bwino ya mapepala a PVC ndi mitundu yowonekera, yoyera, yakuda, yamitundu, ndi imvi.
2. Kodi ubwino wa pepala la PVC ndi wotani?
Mapepala a PVC amapereka zabwino zambiri, kuphatikizapo kukana dzimbiri, kusayaka, mphamvu zotetezera kutentha, komanso kukana okosijeni. Kuphatikiza apo, amatha kubwezeretsedwanso ndipo amakhala ndi ndalama zochepa zopangira. Chifukwa cha kusinthasintha kwawo komanso mtengo wake wotsika, akhala akugwira ntchito nthawi zonse pamsika wa mapepala apulasitiki.
3. Kodi mapepala a PVC amagwiritsidwa ntchito pa chiyani?
Mapepala a PVC ndi osinthasintha kwambiri, amapezeka m'mitundu yosiyanasiyana monga mapepala a PVC omveka bwino, mapepala a PVC oundana, mapepala obiriwira a PVC, mapepala a PVC, ndi zina zambiri. Chifukwa cha magwiridwe antchito awo abwino pokonza, mtengo wotsika wopanga, kukana dzimbiri, komanso mphamvu zotetezera kutentha, mapepala a PVC amagwiritsidwa ntchito kwambiri popanga zophimba zomangira za PVC, makadi a PVC, mafilimu olimba a PVC, ndi mapepala olimba a PVC.
4. Kodi kuipa kwa mapepala a PVC ndi kotani?
Pepala la PVC ndi pulasitiki yomwe imagwiritsidwa ntchito kwambiri yopangidwa ndi polyvinyl chloride, pamodzi ndi mapulasitiki ndi ma antioxidants. Sili ndi poizoni palokha, koma zinthu zothandiza zazikulu, monga mapulasitiki ndi ma antioxidants, ndi poizoni. Mapulasitiki omwe amagwiritsidwa ntchito m'mapepala a PVC a tsiku ndi tsiku makamaka ndi dibutyl terephthalate ndi dioctyl phthalate, zonse ziwiri ndi poizoni. Antioxidant lead stearate yomwe imagwiritsidwa ntchito mu PVC nayonso ndi poizoni. Mapepala a PVC okhala ndi mchere wa lead amatha kutulutsa lead akakumana ndi zosungunulira monga ethanol ndi ether. Mapepala a PVC okhala ndi ma antioxidants ochokera ku lead nthawi zina amagwiritsidwa ntchito popaka chakudya, koma akakhudzana ndi zakudya monga ndodo zokazinga, makeke okazinga, nsomba yokazinga, nyama yophikidwa, makeke, ndi zokhwasula-khwasula, mamolekyu a lead amatha kufalikira mu mafuta. Chifukwa chake, matumba apulasitiki a PVC sayenera kugwiritsidwa ntchito posungira chakudya, makamaka zakudya zamafuta. Kuphatikiza apo, kutentha kwambiri pafupifupi 50°C, zinthu zapulasitiki za polyvinyl chloride zimawola pang'onopang'ono, kutulutsa mpweya wa hydrogen chloride, womwe ndi wovulaza thanzi.
5. Kodi Mapepala a PVC Ndi Otetezeka pa Chakudya?
Mapepala a PVC akhoza kukhala otetezeka pa chakudya, koma pokhapokha ngati apangidwa ndi PVC yapamwamba pa chakudya komanso zowonjezera zoyenera. Mapepala a PVC apamwamba pa chakudya sali oopsa, alibe fungo, ndipo ndi oyenera kukhudzana ndi chakudya mwachindunji kapena mwachindunji, kutengera kapangidwe kake ndi kagwiritsidwe ntchito. Mapepala a PVC otetezeka pa chakudya awa amagwiritsidwa ntchito kwambiri m'mabokosi a chakudya, ma blister packs, ma cling film, ma food tray, ndi zophimba zoteteza.
Komabe, si mapepala onse a PVC omwe amaonedwa kuti ndi otetezeka pa chakudya. Mapepala a PVC apamwamba kwambiri akhoza kukhala ndi mapulasitiki kapena zowonjezera zomwe siziloledwa kuti zigwirizane ndi chakudya. Kuti muwonetsetse kuti ndi otetezeka, nthawi zonse onetsetsani kuti pepala la PVC likutsatira malamulo a FDA ndi EU (EC) okhudzana ndi chakudya, ndipo pemphani mapepala a deta ya chitetezo cha zinthu zomwe wopanga amapanga.
6. Kodi Mapepala a PVC Ndi Oletsa Moto?
Inde, mapepala a PVC mwachibadwa amakhala oletsa moto poyerekeza ndi mapulasitiki ena ambiri. Chifukwa cha kuchuluka kwa chlorine, PVC imadzizimitsa yokha pamene gwero la moto wakunja lachotsedwa, zomwe zimachepetsa kwambiri kufalikira kwa moto.
Mapepala a PVC nthawi zambiri amagwiritsidwa ntchito pazinthu zomwe chitetezo cha moto chili chofunikira, monga zipangizo zomangira, mapanelo a makoma, zotetezera magetsi, zizindikiro, ndi zomangira zamafakitale. Nthawi zambiri, mapepala a PVC amatha kukwaniritsa miyezo yapadziko lonse lapansi yoletsa moto monga UL94 V-0/V-1 kapena yofanana, kutengera kapangidwe kake.
Pa mapulojekiti omwe ali ndi miyezo yokhwima yotetezera moto, mapepala a PVC oletsa moto omwe ali ndi magwiridwe antchito abwino amatha kusinthidwa kuti akwaniritse malamulo enaake omangira komanso zofunikira zopewera moto.
