Ukuthinta kwezinto ezimiselweyo (PP, PE, Nylon) kwenkqubo yakho yokuzoba

I-Polypropylene (PP) Nokuhlanganisa Kona Kukuhlanya Kwe-Monofilament Extrusion Machines

I-Polypropylene (PP) iyathola izinca zokusebenza ezihlukene ezinokuthintana ngqo nokuhlanya kwe-monofilament extrusion machines. Isimo sakho sesi-kristali futhi ukutholakala kwakho kwezindawo zokuphuma (160–170°C) kwenza izinkinga nezidingo zokuphatha ngokuphelele ukuproducwa kwe-filament. Abahlinzi baya kufuna ukuthi bahlangele izinca zomshini ukuze bavumele izinca zika-PP futhi bakhululeke kwezinkinga ezingenabizo njenge-thermal expansion.

Ukuphakama Kwesikhathi Sokuphuma, Ukuphakama Kwesikhathi Sokuphuma, Futhi Ukuvumela Kwesikhathi Sokuphuma

Ukuchitha kwe-PP okukhulu kakhulu kumeliti kuyaphakamisa ukuchitha kwesikhumba ngokuphakama kwenqubo yokuqondisa. Ukuchitha okungafanele kubangela ukuguqula kwezilinganiso zokuphakama, okubangela ukuthi izihlangothi zizohlanza emuva. Ukuze kubuyiselwe ukucindezela kwezinhlangano, abasebenzisi bahlanya izintemperatura zebhalu (ngokujwayelekileyo 200–250°C) nobuchwepheshe bezisikwele—ukulawula ngokucophelela kunciphisa ukuguqula kwezichitha ngokuphakama kusukela ku-15%, okunika umkhawulo wokuchitha kwezilayili ngokulinganayo. Lokhu kunciphisa ukuphakama kwezitension emaqhingweni okuchitha, okuyindlela eyinkulu ekusebenzeni kwezinhlangano zokuchitha kwezihlangothi ngokuphakama.

Ukugcina Kwezilayili Ngokuchitha Kwesikhumba Nokulawula Kwesilinganiso Emva Kokuchitha

Ukubaluleka kwe-PP kwezinhlobo ezikhuphukile ngokuchaphazela (1.5–3.5%) ngemva kokuhlala kahle, okuyisibonelo sokuthi ukubaluleka kwezinhlobo ziyathinta ngqo ukubaluleka kwemithambo yezinkampani eziyisibonelo. Abasayensi bakhuluma lokhu ngokusebenzisa izindawo zokuhlala kahle eziningi nezindawo zokuhlala kahle zokuhlanza ukubaluleka kwezinhlobo zokuhlala kahle ukuze zihlanze ukubaluleka kwezinhlobo zokuhlala kahle. Izinkampani zokubheka ukubaluleka kwezinhlobo zokuhlala kahle ziyasebenzisa izinkampani zokubheka ukubaluleka kwezinhlobo zokuhlala kahle zokubheka ukubaluleka kwezinhlobo zokuhlala kahle ukuze zibuyeke ukubaluleka kwezinhlobo zokuhlala kahle—okunikeza ukubaluleka kwezinhlobo zokuhlala kahle ngaphakathi kwe-±0.05 mm emiphethweni yokuqala.

Ukuziphatha kwe-Polyethylene (PE) Ngemuva Kwesibonelo Sokuhlala Kahl: Ukubaluleka, Ukubaluleka Kwesibonelo Sokuhlala Kahl, Nokubaluleka Kwesibonelo Sokuhlala Kahl Kwesibonelo Sokuhlala Kahl

LDPE vs. HDPE: Ukuhlanya Kwesibonelo Sokuhlala Kahl Kwesibonelo Sokuhlala Kahl Nokubaluleka Kwesibonelo Sokuhlala Kahl

I-LDPE (Low-Density Polyethylene) iqukethe izihlangothi zesikhombisa esisemaphakathini futhi inqanaba le-0.91–0.94 g/cm³, okunika ukuthi kubhekwe ngokuphambuka kwe-melt kakhulu kodwa ubukhulu be-tensile buncane. Lokhu kusiza ekutheni kubhekwe ngokuphambuka kwe-3:1 ku-5:1 kabusha ngaphambi kokuthi isibhubesi siphikiswe, okwenza amafilmi ayo asebenza kubhokisi abe nemfanekiso emhlophe. Ngaphandle kwalokho, i-HDPE (High-Density Polyethylene) inezihlangothi ezingenziwe ngokulungiselela futhi inqanaba eliphezulu kune-0.94 g/cm³, okusiza ekutheni kubhekwe ngokuphambuka kwe-8:1 ngokwesibonelo sokuhlanganiswa kwezihlangothi. Kodwa, ukuthi kubhekwe ngokuphambuka kwe-melt kuncane kuyenza ukuthi kubhekwe ngokuphambuka kwezinhlobo zokugcina ezinkulu njenge-sharkskin uma kubhekwe ngokuphambuka okuphezulu. Imishini yokuqala yamafilamenti eyodwa eyodwa ephinde iyenzelwe i-HDPE iyidinga ukulawula okuphelele kwempilo (180–220°C) ukuze kuvikeleke amaphutha noma kubhekwe ngokuphambuka okuphezulu—lokhu kubalulekile kubhokisi bezindustria nezinhlobo zomshini. Ukuthi i-LDPE ikhona ngokuphambuka kwe-crystallinity (45–55%) kungaphezu kwe-HDPE (70–80%) kuyenza ukuthi kufanele kubhekwe ngokuphambuka kwezinhlobo zokuhlisa amafilamenti ukuze kuvikeleke ukuthi kubhekwe ngokuphambuka okungafanani.

Izinkinga Zokugxilwa, Ukugxilwa Ngokusebenza Kwesikhathi Sokusebenza Ngokuphambuka, Nokubeka Kwe-Die Ngokusebenza Ngokuphambuka

Ukungabi nesibonelo sesiZulu sika-Polyethylene kusinda ukugxilwa ngokusebenza kwesibili njenge-printing noma ukufaka i-coating. Nakuba i-LDPE igxilwa kahle kunye ne-HDPE ngokubonakala kwe-branching yamagama, izinye zizonke zidinga ukuthintela isibonelo—njenge-corona discharge—ukufumula ukugxilwa okwaneleyo >38 dyne/cm². Ukugxilwa ngokusebenza kuyadlula kahle: i-LDPE ikhala ngokuphambuka phakade emva kwe-105–115°C, ekwenza ukuthintela kwezinkambo zokugxilwa kuhlanganisa; i-HDPE inomthetho wokukhala ophezulu (130–137°C) kuyadinga amasikhathi amaningi asebenza. Ukusebenza okude kuyabusa ukubeka kwe-die—i-LDPE ibeka izihlangothi ezihlukile kahle kunye ne-HDPE ngokubonakala kwezinhlobo zokukhala kahle. Idata yasezindustria ibonisa ukuthi ukuvuleka kungadlika ngamaphuzu angu-12–18% emva kwezikhathi zokusebenza zangama-50 uma akukho izisifundo zokucleansing. Ukucleansing ngokusebenzisa i-air-knife noma iziqu zokusebenza zezicatshulwa zokuphambuka ziyasinda ukubeka, ekusinzeni ukuthintela kwe-monofilament ngokuphambuka kwe-±0.05 mm ngokusebenza ngokuphambuka.

Ukuthintana kwe-Nylon nezilwanyana zokushisa nokubhekana okuphambili ngezindlela zokususa izilwanyana ngokupheleleyo ukuthola isiphumo esihle sesikhombisa sokukhishwa kwe-monofilament

Isibopho sokuhlanza kwezilwanyana nokuthintana okuphambili nokugqibela kwesikhathi esinye kwe-Nylon 6/Nylon 66 engasuswanga

Ukuthintana kwe-Nylon nokushisa kuyisibonelo sokuthi izilwanyana ziyathintana ngokuzenzakalelayo ngemva kokugcina nokusebenzisa. Uma izilwanyana ezingaphansi kuka-0.1% kwe-Nylon 6 noma kwe-Nylon 66, kubhekana isibopho sokuhlanza—lokhu kukuthintana kwezilwanyana kuphela kumthwalo wokuhlukanisa izihlangothi zomkhakha. Lokhu kunciphisa ukuphambuka kwezihlangothi ngamakhulu ama-60 futhi kubhekana nokugqibela okungavunyelwa ngemva kokudrawa emaphazimboni akhishwa kwe-monofilament. Izifundo zibonisa ukuthi i-Nylon engasuswanga enezilwanyana ezingu-2.5% ibhekana nokuphambuka kwezinhlobo ekhona ngaphezu kuka-0.3%, okwenza amaphakathi amangalisi aphinde aqhubeka ngokuphambuka kwezinhlobo. Ukuthi sithole isiphumo esihle, ukulawula izilwanyana kuyisibonelo sokuthi kufanele sisebenze ngokupheleleyo—akukho qhakatha lokho okungafanele sisebenze ngalo.

Izinkimbinkimbi zokususa izilwanyana ezihle: Isikhati, Isibopho sokushisa, nokuxhaswa kwezikhathi zokuhlala

Ukususa kahle kufuna ukulinganisa okuphelele kwezinto ezithile. Umgcino wamazwi wabonisa ukuthi ukugcina izintempelature zokuqala ku-80–90°C ngama-4–6 amahora kunciphisa umsindo ku-<0.15%, futhi izindlela zokuhlanza ezingaphansi ku-–40°C zikhindela ukubuyiselwa kwemsindo ngokugcina. Ukulinganisa kwesikhathi sokuhlala kuyisisekelo—ukungakwazi ukuhlala ngaphansi kwamahora ama-3 kusha umsindo wendawo yokuqala, futhi ukudlula ngamahora ama-8 kunciphisa ubunzima bokuphatha kwe-polymer. Emva kokususa, izisistimu zokugcina eziphawulekile zikhindela ukubuyiselwa kwemsindo ngaphambi kokugcina. Iziprothokholi eziqinisekisiwe zihlinza izinkinga zezinyathelo zephepha nezinkinga zokubhekana ngezinkulungwane, ziyahlinza ubunzima bokubeka kwezindawo ngokugcina—futhi zihlinza ukuphatha kwezinhloko zokugcina ngokujwayelekile kwezinhloko zokugcina zokugcina.

Imibuzo Evame Ukubuzwa

Ubani ubuso obukhona kwezinkulungwane zokugcina kwe-polypropylene ngokugcina?

Ukubheka kwezinkulungwane zokugcina kwe-polypropylene kubhekisa kuzo izinkinga zokugcina nezinkinga zokuphatha kwe-polymer ngokugcina, okubhekisa ngqo kubunzima bokubeka kwezindawo, ubunzima bokubeka kwezindawo zokugcina, nokubonakala kwezinhloko zokugcina.

Ukubheka kwezinkulungwane zokugcina kwe-polyethylene (PE) kubhekisa kuzo ukubheka kwezinkulungwane zokugcina?

LDPE eyodlulayo kubonakala ukuthi kusetyenziswa ukuphakanyisa okukhulu (3:1 ku-5:1), ngakho-ke HDPE eyodlulayo kusetyenziswa ukuphakanyisa okukhulu (ku-8:1) kodwa kunye nokuthi kunezinkinga eziningi zokugqibela kwesikhumba xa kusebenziswa ngemvume enkulu.

Kungani ukuthi ukuthintana kwe-nylon nempilo yamandla kuyisisekelo sokuthi kwenziwe ngokuphelele?

I-nylon iyathatha impilo yamandla ngokushesha, okubangela ukuthi kuhlelwe ngokuphelele futhi kufakelwe ngokuphelele kuzo zonke izinto zokuthi kwenziwe ngokuphelele. Ukuthi kubhekwe ukuthi impilo yamandla ingaphezu kwe-0.1% kuyinconywa ukuthi kusebenze ngokuphelele futhi ukuthi kubekwe amaphathi amahle.

Izinhlobo zokudrya eziphelele zika-nylon 6 ne-nylon 66 ziyiphi?

Ukudrya okuphelele kubhekwa ngokuthi kubeka isikhathi sendawo sokudrya phakathi kwe-80–90°C ngemvume yezinsuku ezi-4 ku-6, noma kubhekwa ukuthi i-dew point ingaphezu kwe-–40°C ukuze kunciphwe impilo yamandla ku-<0.15%, ukungavikela ukuthi kubekwe ububi lwesilinganiso noma ukuthi kubekwe ububi lwesikhumba.