1. Liyini ishidi le-PVC?
Ishidi le-PVC liyizinto ze-polymer ezenziwe nge-vinyl chloride njengezinto eziyisisekelo zokusetshenziswa, ezineziqinisi, izinto zokugcoba, kanye nezigcwalisi ezengeziwe. Libonisa umsebenzi omuhle kakhulu we-antioxidant, ukumelana okunamandla kuma-acid kanye nokusabela kwe-redox, amandla aphezulu, ukuzinza okuvelele, kanye nokungashi, okwenza likwazi ukumelana nomonakalo ovela ekushintsheni kwesimo sezulu. Izinhlobo ezivamile zamashidi e-PVC zifaka phakathi izinhlobo ezisobala, ezimhlophe, ezimnyama, ezinemibala, nezimpunga.
2. Yiziphi izinzuzo zeshidi le-PVC?
Amashidi e-PVC anikeza izinzuzo eziningi, okuhlanganisa ukumelana nokugqwala, ukungashi, izakhiwo zokushisa, kanye nokumelana nokugqwala. Ngaphezu kwalokho, angaphinde asetshenziswe futhi abe nezindleko zokukhiqiza eziphansi. Ngenxa yokuguquguquka kwawo kanye nokungabizi kakhulu, ahlale ephethe isikhundla emakethe yamashidi epulasitiki.
3. Asetshenziselwani amashidi e-PVC?
Amashidi e-PVC aguquguquka kakhulu, atholakala ngezinhlobo ezahlukene njengamashidi e-PVC acacile, amashidi e-PVC aqandisiwe, amashidi e-PVC aluhlaza, ama-roll eshidi le-PVC, nokuningi. Ngenxa yokusebenza kwawo okuhle kokucubungula, izindleko zokukhiqiza eziphansi, ukumelana nokugqwala, kanye nezakhiwo zokuvikela, amashidi e-PVC avame ukusetshenziswa ukukhiqiza izembozo zokubopha ze-PVC, amakhadi e-PVC, amafilimu aqinile e-PVC, kanye namashidi e-PVC aqinile.
4. Yiziphi izinkinga ngamashidi e-PVC?
Ishidi le-PVC liyipulasitiki esetshenziswa kakhulu eyenziwe nge-polyvinyl chloride, kanye nama-plasticizer nama-antioxidants. Alinawo ubuthi ngokwalo, kodwa izinto eziyinhloko ezisizayo, njenge-plasticizer nama-antioxidants, zinobuthi. Ama-plasticizer asetshenziswa emashidini e-PVC ansuku zonke afaka phakathi i-dibutyl terephthalate kanye ne-dioctyl phthalate, zombili ezinobuthi. I-antioxidant lead stearate esetshenziswa ku-PVC nayo inobuthi. Amashidi e-PVC aqukethe usawoti we-lead angakhipha i-lead uma ehlangana nezinyibilikisi ezifana ne-ethanol ne-ether. Amashidi e-PVC anama-antioxidants asekelwe ku-lead ngezinye izikhathi asetshenziselwa ukupakisha ukudla, kodwa uma ehlangana nokudla okufana nezinti zenhlama ethosiwe, amakhekhe athosiwe, izinhlanzi ezithosiwe, inyama ephekiwe, ama-pastry, kanye nokudla okulula, ama-molecule e-lead angasakazeka emafutheni. Ngakho-ke, izikhwama zepulasitiki ze-PVC akufanele zisetshenziselwe ukubamba ukudla, ikakhulukazi ukudla okunamafutha. Ngaphezu kwalokho, emazingeni okushisa aphezulu azungeze ama-50°C, imikhiqizo yepulasitiki ye-polyvinyl chloride iyabola kancane kancane, ikhiphe igesi ye-hydrogen chloride, okuyingozi empilweni.
5. Ingabe Amashidi e-PVC Aphephile Ukudla?
Amashidi e-PVC angaphephile ekudleni, kodwa kuphela uma ekhiqizwa nge-PVC yezinga lokudla kanye nezithasiselo ezihambisanayo. Amashidi e-PVC yezinga lokudla awanobuthi, awanaphunga, futhi afaneleka ukuthintana nokudla okungaqondile noma okuqondile, kuye ngokuthi akhiwe kanjani futhi asetshenziswe kanjani. Lawa mashidi e-PVC yezinga lokudla avame ukusetshenziswa ekupakisheni ukudla, kuma-blister packs, kuma-cling films, kuma-food tray, nasezimbozweni zokuvikela.
Kodwa-ke, akuwona wonke amashidi e-PVC abhekwa njengaphephile ekudleni. Amashidi e-PVC esezingeni lezimboni angase abe nama-plasticizer noma izithasiselo ezingavunyelwe ukuthintana nokudla. Ukuqinisekisa ukuphepha, qinisekisa njalo ukuthi ishidi le-PVC liyahambisana nemithethonqubo ye-FDA kanye ne-EU (EC), bese ucela amashidi edatha yokuphepha kwezinto zomenzi.
6. Ingabe amashidi e-PVC ayavimbela ilangabi?
Yebo, amashidi e-PVC ayakwazi ukuvimba ilangabi ngokwemvelo uma kuqhathaniswa namanye amapulasitiki amaningi. Ngenxa yokuqukethwe kwawo okuphezulu kwe-chlorine, i-PVC iyazicima ngokwayo lapho umthombo wangaphandle womlilo ususwa, okunciphisa kakhulu ukusabalala komlilo.
Amashidi e-PVC avame ukusetshenziswa ezindaweni lapho ukuphepha komlilo kubalulekile khona, njengezinto zokwakha, amaphaneli odonga, ukufakelwa kukagesi, izimpawu, kanye nezindawo zokuvala zezimboni. Ezimweni eziningi, amashidi e-PVC angahlangabezana nezindinganiso zomhlaba wonke zokuvimbela ilangabi njenge-UL94 V-0/V-1 noma efanayo, kuye ngokuthi yakhiwe kanjani.
Kumaphrojekthi anezindinganiso zokuphepha komlilo eziqinile, amashidi e-PVC avimbela ilangabi anokusebenza okuthuthukisiwe angenziwa ngezifiso ukuze ahlangabezane namakhodi okwakha athile kanye nezidingo zokumelana nomlilo.
