Empilweni yethu, izinkomishi zephepha ezilahlwayo zibalulekile. Kungakhathaliseki ukuthi ukwamukela izihlobo, abangani namakhasimende, noma njengendlela yokukhangisa, le nkomishi yephepha kumele isetshenziswe. Njengamanje, izinkomishi zephepha ezilahlwayo emakethe zivame ukusetshenziswa izinkomishi zephepha ezigcotshwe nge-PE kanye nezinkomishi zephepha ezigcotshwe nge-PLA. Yikuphi kulezi zinto ezimbili okungcono futhi okunobungani nemvelo?
Izinkomishi zephepha zendabuko ngokuvamile zisebenzisa ungqimba lwe-PE coating ebusweni bephepha eliyisisekelo ukuze zithole ukusebenza okuhle okungangeni manzi futhi okumelana namafutha. Izinkomishi zephepha ezimbozwe nge-PE aziboli, aziphindiselelwa, futhi kunzima ukuziphinda zisetshenziswe. Izinkomishi zephepha zendabuko ezimbozwe nge-PE kunzima ukuziphinda zisetshenziswe ngoba kunzima ukuhlukanisa ifilimu ye-polyethylene ebusweni bendebe yephepha nendebe yephepha.
Izinto ze-PLA uhlobo olusha lwezinto ezibolayo. Ziyinto ekhishwe kusitashi sommbila. Ngemva kokusetshenziswa, zingabola yizinto ezincane zemvelo ngaphansi kwezimo ezithile, futhi ukubola kungagcina kwakheke i-carbon dioxide namanzi.
Izinkomishi ezimbozwe nge-PLA zivame ukunconywa njengendlela "enobungani nemvelo" esikhundleni sezinkomishi zephepha ezimbozwe nge-PE, iqiniso liwukuthi i-PLA empeleni iyipulasitiki futhi inezinkinga ezifanayo nezinkomishi zephepha ezimbozwe nge-PE. Ukubola kwe-PLA kudinga ukuhlangabezana nezimo ezimbili: umswakama ongu-50%-60% kanye nokushisa okungu-50-70 degrees Celsius. Ngaphansi kwalezi zimo, kungenzeka ukuthi ama-microorganisms abole kancane kancane i-PLA ngemva kwezinyanga ezimbalwa noma ngaphezulu. Kodwa-ke, kunzima ngendawo yemvelo ukufinyelela izinga lokushisa elidingekayo ukuze yonakale. Uma imikhiqizo ye-PLA ilahlwa ngokuthanda kwayo, ayikwazi ukubola ngempela. Ukuze yonakale i-PLA, kumele icutshungulwe ezimbonini ezindaweni ezikhethekile zokwenza umquba. Eqinisweni, amazwe ambalwa analezi zindawo zezimboni.
Ngaphezu kwalokho, izifundo zikhombisile ukuthi izinga lokuwohloka kwe-PLA cishe alifani nelepulasitiki evamile emanzini ahlanzekile nasemanzini olwandle. I-European Plastics Association iphinde yathi amapulasitiki abolayo awakwazi ukubhekwa njengonobungani nemvelo kunepulasitiki yendabuko engonakalisi. Uma izimo zokuwohloka zingahlangatshezwa, empeleni akukho mehluko phakathi “kwamapulasitiki abolayo” namapulasitiki avamile.
Nakuba izinkomishi zephepha ezimbozwe yi-PLA zingabola, izindleko zezinto ze-PLA ziphakeme ngokuphindwe kabili kuya kathathu kuneze-PE, futhi izindleko zezinto zokusetshenziswa eziphezulu ziholela emananini aphezulu. Ngakho-ke, izinkomishi zephepha ezilahlwayo ezivamile emakethe izinkomishi zephepha ezimbozwe yi-PE.
Isikhathi sokuthunyelwe: Disemba 27-2022
