I-PVC yokwelapha (I-Polyvinyl chloride) ne-PVDC (Polyvinylidene chloride) zombili izinto ezisetshenziswayo ezivame ukusetshenziswa embonini yezemithi ngezinhloso zokupakisha. Ngenkathi zinokufana okuthile, kunomehluko omkhulu phakathi kwalokhu okubili:

Ukwakheka:

I-PVC yokwelapha: Kuyi-polymer ye-thermoplastic eyakhiwe ngokuyinhloko nge-vinyl chloride monomers. Izithasiselo ezengeziwe zihlanganiswa ukuze kuthuthukiswe izici zayo ezifana nokuguquguquka, ukumelana nomthelela, nokuqina.
I-PVDC: Kuyi-polymer ye-thermoplastic eyakhiwe ngokuyinhloko nge-vinylidene chloride monomers.. I-PVDC iyi-copolymer ye-vinylidene chloride namanye ama-monomers, ngokuvamile iqukethe iphesenti elincane le-vinyl chloride.
I-Barrier Properties:

I-PVC yokwelapha: I-PVC inikeza izakhiwo zokuvimbela ezilinganiselwe ngokumelene nomswakama, umoya-mpilo, namanye amagesi. Inikeza ukuvikeleka okwanele emikhiqizweni eminingi yemithi kodwa ingase ingasebenzi kahle ekwakhiweni okuzwela kakhulu noma okuzwela umswakama..
I-PVDC: I-PVDC yaziwa ngezakhiwo zayo ezinhle kakhulu zokuvimba. Inikeza umgoqo oyingqayizivele ngokumelene nomswakama, umoya-mpilo, ukukhanya, namanye amagesi. Amafilimu noma ama-laminate ahlanganiswe ne-PVDC anikeza isivikelo esingcono kakhulu sokuqinisekisa ukuzinza nokuphila isikhathi eside kwemikhiqizo yemithi..
Ukucaca:

I-PVC yokwelapha: I-PVC ngokuvamile isobala, okuvumela ukuhlolwa okubonakalayo kokuqukethwe ngaphakathi kwephakheji.
I-PVDC: Amafilimu e-PVDC noma ama-coatings asobala kakhulu, ukunikeza ukucaca okuhle kakhulu nokubonakala komkhiqizo opakishiwe.
Ukumelana Kwamakhemikhali:

I-PVC yokwelapha: I-PVC imelana namakhemikhali amaningi avamile futhi inokumelana okuhle nowoyela, amafutha, notshwala. Nokho, ingase ingahambisani nezincibilikisi ezithile noma amakhemikhali anolaka.
I-PVDC: I-PVDC ikhombisa ukumelana namakhemikhali aphezulu futhi ihambisana nohlu olubanzi lwezincibilikisi namakhemikhali uma kuqhathaniswa ne-PVC..
Ukuqina okushisayo:

I-PVC yokwelapha: I-PVC inokuzinza okuhle kwe-thermal futhi ingamelana nezinga lokushisa elibanzi phakathi nokucubungula nokugcinwa.
I-PVDC: I-PVDC inokuqina okuhle kakhulu kwe-thermal, ukuyivumela ukuthi igcine izakhiwo zayo zokuvimba ngisho nangaphansi kwezimo ezishisa kakhulu.
Ukucatshangelwa Kokulawula:

I-PVC yokwelapha: I-PVC yamukelwa kabanzi futhi yamukelwa izicelo zokupakisha zemithi. Nokho, sekuphakanyiswe ukukhathazeka mayelana nokucwiliswa kwamaplasitiki okungenzeka (isib., DEHP) kusuka ku-PVC, ikakhulukazi kwezinye izinhlelo zokusebenza zezokwelapha.
I-PVDC: I-PVDC ngokuvamile ibhekwa njengento ephephile nephumelelayo yokuvimbela ukupakishwa kwemithi. Ivame ukusetshenziswa ezinhlelweni lapho izakhiwo ezithuthukisiwe zokuvimbela zidingeka.
Kubalulekile ukuqaphela ukuthi izakhiwo ezithile kanye nokwakheka kwe-PVC yokwelapha kanye ne-PVDC kungahluka kuye ngomkhiqizi kanye nesicelo esihlosiwe.. Imihlahlandlela yokulawula kanye nezidingo zingase futhi zinqume ukukhethwa kwempahla yokupakishwa kwemithi.