Ukufunda Ukuthi Yini Ukuphuthela Ubukhulu Bekhwalithi Nokuhambisana Kwakho Kukusebenzisa Kabusha

Ukuvuselela Kwizinca Zomsebenzi Wokuvusa Iplastiki Ngokuvuselela

Ukuvuselela isixhobo sokwenza izimpahla zokuthinteka ngokushesha kuyimfanele ukuthi kwenziwe ukuthi izihlangothi zokuvuswa ngokwesikhathi sokuvuswa zibe yisibonelo esifanayo, esihle, futhi sisebenza kahle emva kwalokho. Izinca ezintathu zokulawula zilandela ngqo ishaping yezinhlobo, ubukhulu bezinhlobo, nokusebenza kahle emva kwalokho.

Ukulawula ukugxila: Ukuphakama kwesikhathi sokugxila, isivinini sesikrabi, nokulandela ukuphakama kwesikhathi sokugxila

Ukuphatha kwezinyathelo zokubeka isikhathi sokubeka kwesibhakabhaka esihle kusinda ukuthi isibhakabhaka sifanele ngokuphelele futhi kusinda ukuthi isibhakabhaka sifanele ngokuphelele. Kuma-polymers asebenzisa i-olefin, isibhakabhaka esisodwa esiphakanyayo kwi-210–230 °C sisebenza ukuhlinzeka kokukhanya kwezinyathelo; ukuchitha kwe-±5 °C kungakhetha ukuguqula kwe-viscosity yomshini ngokuphakeme kwe-12 % (I-Society Yokusebenza Kwemithambo, 2022). Isivinini sescrew kufanele sifanane nesikhathi sokuhlala kwesibhakabhaka — ukongeza kusuka ku-200 ku-300 rpm kusukela kuyenza ukuphakama kwesibhakabhaka ngokuphakeme kwe-15–20 °C, okungakhetha ukuthi imithambo eyisikhali yasemva kwezinyathelo zokugcina (I-Engineering Yemithambo, 2023). Ukushisa kakhulu kususa umkhondo wemolekyuli, okususa ukuthi isibhakabhaka siphakame ngokuphakeme kwe-8 % (I-Journal Yokusebenza Kwemithambo Echanekileyo, 2021). Ukuthi iphresha yomshini ibe yisibhakabhaka esihle kuyisibhakabhaka esihle: ukuchitha okungaphezulu kwe-±3 bar kuhambisana nokuphakama kwesibhakabhaka ngokuphakeme kwe-4 % kwezindlela zokubeka izinkulungwane nezindlela zokubeka izinkulungwane ezingavamileyo kwe-Melt Flow Index (MFI) ngokuphakeme kwezindlela zokubeka (I-Advances in Polymer Technology, 2022). Ukuphatha phakathi kwesikhathi sokubeka ngokuphakeme kwe-pressure ngokuphakeme kwe-melt pumps kususa ukuthi iphresha iyaphakama futhi iyathumela isibhakabhaka esihle kwise-die.

Ukupholisa nokusika ngokunemba: Ukufana kokucima, ukuthuthwa kwe-strand, nokuvumelanisa umshini wokusika

Ukuvala ukucisha okufanayo ku-crystallinity futhi kuvimbela ukuguqulwa kwe-pellet. Ezimisweni zokugeza ngamanzi, ukwehla kwamazinga okushisa angama-5 °C kuphela kulo lonke ibhavu kudala ukungafani kwe-amorphous-crystalline, okuholela kumlingani wokushintshashintsha kwe-6% kuya ku-8% kusayizi we-granule (Ukuhlolwa kwePolymer, 2020). Ukuze kuhlanganiswe izinhlayiya, kubalulekile ukuba zikhishwe kahle: ama-roller ageleza noma adlidlize abangela ukuba izinhlayiya zinyakaze, okubangela ukusikeka okubukhali. Ukusika ubuso obudayiwe kudinga ukuvumelanisa okuqinile phakathi kokujikeleza kwesikhunta nokugeleza kokuncibilika. Ukulibaziseka okungu-2% kwejubane lokusika uma kuqhathaniswa nomthamo kukhulisa ukuguquguquka kobude be-pellet kube ngu-± 0.5 mm futhi kungakhuphula ukukhiqizwa kwezinhlayiya (izinhlayiya < 2 mm) (International Polymer Processing, 2022). I-pelletizer eqondiswe kahle igcina i-pellete geometry ngaphakathi kwe-0.3 mm tolerance futhi igcina izinhlawulo ngaphansi kuka-0.5%.

Ukuphatha isibonelo sika-blade nokufaka kwe-geometry: Imiphumela kufomu yamagranules, ukudala kwe-fines, nokugcina kwe-size distribution

Isimo sika-blade sifaka ngqo ubukhulu bekupellet. Amasiphe angafanele aqhubeka ngokuthwabha kune-ukusila, okwenza ukuthwabha kwe-fines kungaphezulu kuka-30 % (Recycling Technology, 2023). Ukubuyisela noma ukuzilima kabusha ama-blade ngasinye emasikhathi e-200–300 okusebenza kuhlinzekile ukuthi kupellet kungahlinze kanye nokuchithwa. I-geometry ibalulekile futhi: i-die-face cutter enemithambo ya-30° iyaphroducisa amafines angaphezulu kuka-20 % kulokho okwenza i-90° blade engafanele ngokuthwabha kwe-micro-fractures ngokusebenzisa ukusila okulungile (Polymer Engineering & Science, 2022). Isikhombiso phakathi kwe-rotor-ne-stator kufanele kubekwe phakathi kwe-0.05 ne-0.10 mm; uma kubizwa ngaphezulu kwe-0.15 mm kuyenza ukuthi kupellet okhulu kakhulu (> 4 mm) kungaphezulu kuka-15 %. Ukubheka ngokuphathelene ngezikhathi zonke ukulungiswa kwe-blade nokugcina isikhombiso kuyindlela eyinkulu yokuhlinzeka kwe-size distribution engaphezulu kanye nokunciphisa ukuthwabha kwescreen-pack yezindawo ezizungezini.

Ukuvikela Ubukhulu Bekufakwa Kwe-Feedstock Nokuphatha Kokuthwabha Kwesithakazelo Kwe-Granulation

Ukukhula kwezinkqubo zokuvuselela izinkolo zisithembekile kubukhulu nokuphelele kwezinkqubo ezihlanganisiweyo. Izinto ezingavunyelwanga — kusukela kumakhiyoni okuhlanganisiweyo kuze kumaphakathi amanzi — zihlaziyisa ukuphelele kwezinkqubo zokufaka, zihlaziyisa ukuphatha kwemikhombi yezinkqubo nezinkqubo zokuvulwa, futhi zihlenza izinkolo ezingavumelekile. Izindlela zokuzungezela zokuvuselela izinkolo zilandeline kulezi zinkqubo zokuvuselela.

Ukuchaza kwezinkolo ngokusebenzisa i-NIR futhi ukuthi ukuhlola izinto ezinamagugu phambi kokuvuselela izinkolo

I-near-infrared (NIR) spectroscopy ikhomba izinhlobo zamapholymer ngezimpawu zazo eziyingqayizivele, okuvumela ukuphuma okusheshayo kwama-flakes angcoliswe ngokuhlangana ngaphambi kokuba angene ku-extruder. Ngisho nokungcola okuncane kwe-PVC okungama-50 ppm kungabangela amaphutha abonakalayo kanye nezakhiwo ezincishisiwe zemishini ku-PET esetshenziswe kabusha (Plastics Recyclers Europe, 2021). Ama-NIR ahlukanisa izinto zanamuhla athola ubumsulwa obungaphezu kuka-99% lapho kusetshenziswa amathani angaphezu kwama-2 ngehora. Uma zihlanganiswa nezihlukanisi kazibuthe nezindawo zokuthola izinsimbi ezihamba nge-eddy-current, lezi zinhlelo zisusa izinsimbi ezinsimbi nezingezona ezensimbi ezazingase zonakalise isikulufa noma zenze izindawo ezishisayo. Ukuhlanganisa lezi zindlela zobuchwepheshe ngqo phezulu kuqinisekisa ukuthi izinto ezihlangabezana nezidingo eziqondile ze-polymer nokuhlanzeka kuphela ezingena enqubweni yokuxosha ukugcina i-screw ne-barrel geometry, ukunciphisa ukugqoka kwe-die-face cutter, nokugcina ukusatshalaliswa kwesayizi wezinhlayiya.

Ukushisa nokuguquguquka kwesithasiselo: Umthelela ekuvumelaneni kokuncibilika kanye nobuqotho be-granule

Imiphumela yokusebenzisa izinto ezihlukene kwenziwa ngokuphathelene nesikhathi sokusebenza. Uma i-PET flake ene-content yamandla ayisikhathi esingaphansi kwe-0.05 % ingena ku-extruder, ukususa kwamandla kuyabeka isibonelo sokugcina amandla okuphatha, okuvamisa ukuthi i-intrinsic viscosity iyakwanele ku-15 % (izindaba zokusebenza, 2020). Lokhu kubeka umsebenzi wokuphatha okungafanelekile, kubeka izitha zokubuka kwezindawo zokuphatha, futhi kubeka izigqoko ezingaphansi kwe-density yekhanda nezinkinga zokuphatha kokuphatha. Ngokufanayo, izinguquko kwezinkambo zokuhlanganisa — njengokwakhiwa kwezinkambo zokuphatha noma kwezinkambo zokuhlanganisa — ziyagcina i-MFI futhi ziyagcina ukuphatha kwe-crystallization, okunika izigqoko ezingafanelekile kwezinhlobo nezinsiza. Izinhleli zokuzama amandla kwezinye nezinhleli zokuhlanganisa amandla zokuphatha ziyagcina izinguquko zokuphatha kwezinye, ziyagcina ukuphatha kwe-melt viscosity nezinhlobo zokuphatha kwe-strand. Ukuphatha kwezi zinto zonke ziyagcina ukuthi izigqoko zonke ziyagcina izinhlobo zokuphatha nezinhlobo zokuphatha.

Ukuvavanya Ukuthi Izigqoko Ziyisifundo Ngokuphatha Kwe-Rheological Nezinhlobo Zokuphatha

Ukulingana kwe-melt flow index (MFI) kunye ne-rheometry njengezindlela zokubonisa ukulingana kwezibhalo zemigqambo

Ukuzimela kwe-melt flow index (MFI) kusinika umbala wokuzimela okusheshayo nokuphathwa ngokulinganisayo we-viscosity yomelt yamapolymeri okubuyiselwa, okuyisiphelo sezindlela zokugqibela. Umbala wesikhathi esifanayo we-MFI phakathi kwamabatchi akhombisa ukuthi ubungakanani besilinganiso se-molecular weight uyasebenza ngokuphelele futhi kukhona ukungahloniphi kakhulu ekusukweni kwesikhathi sokugqibela — lokhu kuyisibonelo esihlukene sokuthi amagranule ayisibatchi esifanayo. Isibonelo, i-polypropylene reclaim ishowa ukuguqula kwe-MFI ngokwesikhathi esifanayo noma ngokwesikhathi esihlukileyo, uma kubonakala ukuthi kunezinto ezingavumelekileyo ezisendaweni yokufaka noma ukuthi umkhondo wokusebenzisa izintemperatura zihlukile, okuyisithembiso sokuthi ukusebenzisa amagranule kusenziwa ngokuphathwa ngokulinganisayo. I-rheometry iyagcina i-MFI ngokuthola ubungakanani besikhathi sokuzimela okuhlanganisa isikhathi sokuzimela noma ukuthi umelt uyakhanya — izinto ezinjalo ziyathinta indlela okuyizimela ngayo amagranule futhi zilula kumaphrojekthi we-injection molding noma we-film extrusion. I-fingerprint yorheological engaphezulu — okuyisibonelo sokuthi izinkambo zokuzimela ziyahlukana ngokuphelele phakathi kwamabatchi — ikhombisa ukuthi ubungakanani be-amagranule buyisibonelo sokuthi bayisibatchi esifanayo, nakuba i-MFI kuphela ibonakala njengokuthi ibe yisibonelo sokuthi ibe yisibatchi esifanayo. Lokhu kuyisibonelo sokuthi kusenziwa ngokuphathwa ngokulinganisayo kuyasindisa izinkinga zokuthi kuzosha kakhulu noma kuzofakwa ngokuhlukile amaphrojekthi.

Ukuhambisana kwezinkundla zokuphakama nokukhala kwezinkundla: Ukubonisa ukuthi izinkundla zokusebenza zihambisana nendlela yokugcina kwesikhumba

Ukuzimela kwezinkundla ezisakhiwe ngokusebenzisa isikhumba esisakhiwe ngokusebenzisa isikhumba sokuvuselela sibonisa ukuthi indlela yokugcina kwesikhumba sibonisa ukuthi isikhumba sisebenza njani ekugcineni. Ukuhambisana kwezinkundla zokuphakama nokukhala kwezinkundla kuyisilinganiso esikhulu sokufaka imithombo, ukuphatha kwesikhumba, nokuhambisana kwesikhumba sokufaka — konke oku kuyaphinda phakathi kokunqula kwezikhumba. Ngokuphathwa kwezinye izinhlangano, ukuba kukhona ukongeza kwe-5% kwezinhlobo zezinhlobo zokugcina kusikhumba sokugcina kubangela ukuphela kwe-12% kwezinkundla zokuphakama nokuphela kwe-20% kwezinkundla zokukhala, okubonisa ukuthi kudingeka ukuba isikhumba sibe nenkulu yekhanda nekhanda elinganayo. Ukujabula lezi zinkundla ngasinye isikhumba sibonisa ukuthi isikhumba sokuvuselela sifika eminimumi yezinkundla zokuphakama nezinkundla zokukhala okufanele kumasevisi okwamanje njengokukhishwa kwamapipi noma amapharti we-automotive. Ukuthi izinkundla zokuphakama-nezinkundla zokukhala ziyakhuluma ngokuphelele ngasinye isikhumba sibonisa ukuthi isikhumba sokugcina sifika ematerial engekho ngokuphathwa kwezinkundla zokuphakama.

Imibuzo Evame Ukubuzwa

Kungani ukubeka isimo sesihamo esikhulu kubukhweleka kwesithuthu?

Ukubeka isimo sesihamo sibuyisela ukubukhweleka konke futhi sikhuluma ukugcina kwezinhlobo zesihamo, okungakwazi ukuthintela ubukhweleka besithuthu nokubukhweleka kwebhokisi.

Kungani ubukhweleka kwezinhlobo zokufaka kubangela ubukhweleka kwezinhlobo?

Ubukhweleka obunzima bukhuthaza ukubukhweleka kwezinhlobo, okusula ubukhweleka futhi bakhuthaza izinkinga njengezinkinga zokubuka kwezinkinga nezinkinga zokuphila kwezinhlobo.

Kungani ukusebenzisa i-NIR spectroscopy kubukhweleka?

I-NIR spectroscopy ibonisa izinhlobo zezinhlobo ukuze kususwe izinhlobo ezihlukene, ukuvinza ubukhweleka kwezinhlobo futhi ukubuyisela ubukhweleka kwezinhlobo.

Kungani ukuzinikela izinyawo kubukhweleka kubalulekile?

Ukuzinikela izinyawo eziyisifuba zisula ukwenza izinyawo ezinkulu, zibuyisela ukwenza izinyawo ezizodwa, futhi zisula ukwenza izinyawo ezinkulu noma ezilungile.

Kungani ukuzinikela i-MFI kubonisa ubukhweleka kwezinhlobo?

Ukuzinikela i-MFI kubonisa ubukhweleka besithuthu futhi kubonisa ubukhweleka kwezinhlobo, kusiza ukubonisa ukubaluleka nokubaluleka kwezinhlobo zokusebenza.