I-PET (i-Polyethylene terephthalate)
Ukomisa kanye Nokucwebezelisa ngaphambi kokucubungula ukubumba komjovo
Kumele yomiswe ngaphambi kokubunjwa. I-PET izwela kakhulu ku-hydrolysis. Umshini wokomisa umoya ojwayelekile ungu-120-165 C (248-329 F) amahora ama-4. Umswakama kufanele ube ngaphansi kuka-0.02%.
Yamukela uhlelo lwe-ODEMADE IRD, isikhathi sokumisa sidinga imizuzu eyi-15 kuphela. Yonga izindleko zamandla cishe ngo-45-50%. Umswakamo ungaba ngu-50-70ppm. (Izinga lokushisa lokumisa, isikhathi sokumisa singashintshwa yisidingo samakhasimende ezintweni ezomile, lonke uhlelo lulawulwa yi-Siemens PLC). Futhi kuwukucubungula nge-Drying & Crystallizing ngesikhathi.
Izinga lokushisa elincibilikayo
265-280 C (509-536 F) kumabanga angagcwalisiwe
275-290 C (527-554 F) yebanga lokuqinisa ingilazi
Izinga lokushisa lesikhunta
80-120 C (176-248 F); Ibanga elincanyelwayo: 100-110 C (212-230 F)
Ingcindezi yomjovo wezinto ezibonakalayo
30-130 MPa
Isivinini sokujova
Isivinini esikhulu ngaphandle kokubangela i-embrittlement
Umshini wokubumba umjovo:
Ukubumba komjovo kusetshenziswa ikakhulukazi ukuthuthukisa ukubunjwa kwe-PET. Imvamisa, i-PET ingakhiwa kuphela umshini wokubumba umjovo wesikulufa.
Kungcono ukukhetha isikulufu esiguquguqukayo esinendandatho ehlehlayo phezulu, enobunzima obukhulu bobuso nokumelana nokugqoka, futhi ukubukeka kwe-aspect ratio akuyona i-L / D = (15 ~ 20): isilinganiso esingu-1 sokucindezela esingu-3:1.
Izinto ezine-L/D enkulu kakhulu zihlala emgqonyeni isikhathi eside, futhi ukushisa ngokweqile kungabangela ukuwohloka kuphinde kuthinte ukusebenza komkhiqizo. Isilinganiso sokucindezela sincane kakhulu ukukhiqiza ukushisa okuncane, kulula ukwenza ipulasitiki, futhi sisebenza kabi. Ngakolunye uhlangothi, ukuphuka kwemicu yengilazi kuyoba ngaphezulu futhi izakhiwo zemishini yezintambo zizoncishiswa. Lapho i-PET ye-glass fiber eqinisiwe iqiniswa, udonga lwangaphakathi lomgqomo lugugile kakhulu, futhi umgqomo wenziwe ngempahla ephikisana nokugqoka noma ehlanganiswe nempahla eqinile yokugqoka.
Njengoba umlomo wombhobho umfushane, udonga lwangaphakathi ludinga ukushaywa phansi futhi indawo yokuvula kufanele ibe nkulu ngangokunokwenzeka. Umbhobho wohlobo lwe-hydraulic brake valve muhle. Imibhobho kufanele ibe nezindlela zokulawula izinga lokushisa ukuze kuqinisekiswe ukuthi imibhobho ayiqini futhi ivimbe. Kodwa-ke, izinga lokushisa le-nozzle akufanele libe phezulu kakhulu, ngaphandle kwalokho lizobangela i-runny. Impahla ye-PP enengcindezi ephansi kufanele isetshenziswe futhi umgqomo uhlanzwe ngaphambi kokuqala ukwakha.
Izimo eziyinhloko zokubumba umjovo we-PET
1, izinga lokushisa lomgqomo.Ibanga lokushisa elibunjwayo le-PET lincane, futhi izinga lokushisa lizothinta ngqo ukusebenza komkhiqizo. Uma izinga lokushisa liphansi kakhulu, akukuhle ukwenza ipulasitiki izingxenye zepulasitiki, izibonda, nokuntuleka kwezinto ezingalungile; ngokuphambene nalokho, uma izinga lokushisa liphezulu kakhulu, lizobangela ukuqhuma, ama-nozzles azogeleza, umbala uzoba mnyama, amandla omshini azokwehla, ngisho nokuwohloka kuzokwenzeka. Ngokuvamile, izinga lokushisa lomgqomo lilawulwa ku-240 kuya ku-280 ° C, futhi izinga lokushisa le-PET le-glass fiber liqiniswe ku-250 kuya ku-290 ° C. Izinga lokushisa le-nozzle akufanele lidlule i-300 ° C, futhi izinga lokushisa le-nozzle ngokuvamile liphansi. kunezinga lokushisa lomgqomo.
2, izinga lokushisa lesikhunta.Ukushisa kwesikhunta kuthinta ngokuqondile izinga lokupholisa kanye ne-crystallinity yokuncibilika, i-crystallinity ihlukile, futhi izakhiwo zezingxenye zepulasitiki nazo zihlukile. Ngokuvamile, izinga lokushisa lesikhunta lilawulwa ku-100 kuya ku-140 °C. Amanani amancane ayanconywa lapho wenza izingxenye zepulasitiki ezinezindonga ezincane. Lapho wenza izingxenye zepulasitiki ezinodonga oluqinile, kunconywa ukuthi ube nenani elikhulu.
3. Ukucindezela komjovo.I-PET melt iwuketshezi futhi kulula ukwakha. Ngokuvamile, ukucindezela okuphakathi kuyasetshenziswa, ingcindezi i-80 kuya ku-140 MPa, kanti i-PET ye-glass fiber-reinforced ine-injection ye-90 kuya ku-150 MPa. Ingcindezi yomjovo kufanele inqunywe ngokubheka i-viscosity ye-PET, uhlobo nenani lokugcwalisa, indawo nosayizi wesango, ukwakheka nosayizi wengxenye yepulasitiki, izinga lokushisa lesikhunta, kanye nohlobo lomshini wokubumba umjovo. .
Wazi kangakanani ngokucutshungulwa kwamapulasitiki e-PET?
1, ukucutshungulwa kwepulasitiki
Njengoba ama-macromolecule e-PET aqukethe isisekelo se-lipid futhi ane-hydrophilicity ethile, izinhlayiya zizwela emanzini emazingeni okushisa aphezulu. Lapho umswakama ungaphezu komkhawulo, isisindo samangqamuzana e-PET siyancipha, futhi umkhiqizo uba nombala futhi uba brittle. Kulokhu, impahla kumele yomiswe ngaphambi kokucubungula. Izinga lokushisa omisiwe 150 4 amahora, ngokuvamile 170 3 kuya 4 amahora. Indlela yejethi yomoya isetshenziselwa ukuhlola ukuthi impahla yomile ngokuphelele yini.
2. Ukukhethwa komshini wokubumba umjovo
I-PET inendawo emfushane yokuncibilika kanye nephuzu eliphakeme lokuncibilika, ngakho-ke kuyadingeka ukukhetha uhlelo lomjovo olunebanga elikhulu lokulawula izinga lokushisa kanye nokuzifudumeza okuncane ngesikhathi se-plasticization, futhi isisindo sangempela somkhiqizo asikwazi ukuba ngaphansi kuka-2/3 we isisindo sawo. Inani lomjovo womshini. Ngokusekelwe kulezi zidingo, eminyakeni yamuva nje, iRamada isungule uchungechunge lwezinhlelo ezikhethekile ze-PET ze-plasticizing ezincane neziphakathi. Amandla okubamba akhethiwe makhulu kuno-6300t/m2.
3. Isikhunta kanye nomklamo wesango
Ama-PET preforms ngokuvamile akhiwa yisikhunta esigijima esishisayo. Isivikelo sokushisa phakathi kwesikhunta kanye nomshini wokubumba umjovo kungcono ukuthi sifakwe ubukhulu obuyi-12 mm, futhi isihlangu sokushisa singakwazi ukumelana nokucindezela okukhulu. Imbobo yokukhipha umoya kufanele ibe yanele ukugwema ukushisisa ngokweqile kwendawo noma ukushibilika, kodwa ukujula kwembobo ye-exhaust ngokuvamile akudluli u-0.03 mm, ngaphandle kwalokho ukukhanya kulula.
4. Izinga lokushisa elincibilikayo
Ukulinganisa kungenziwa ngendlela yendiza yomoya. Ku-270-295 ° C, izinga lokuthuthukiswa kwe-GF-PET lingasethwa ku-290-315 ° C.
5. Isivinini sokujova
Ijubane lomjovo jikelele liyashesha kakhulu, okuvimbela ukuphulukiswa komjovo kusenesikhathi. Kodwa ngokushesha okukhulu, izinga eliphezulu lokugunda lenza izinto zibe brittle. I-popup ngokuvamile izoqedwa kumasekhondi angu-4.
6, ingcindezi emuva
Okuphansi kungcono, ukuze ungagqoki. Ngokuvamile akukho ngaphezu kwe-100bar.
Isikhathi sokuthumela: Feb-24-2022