Kukho iintlobo ezininzi zeplastiki ezinoluhlu olubanzi lokusetyenziswa. Okwangoku, iindidi eziphambili ziyi-polyvinyl chloride, i-polystyrene kunye ne-polyester (PET). Iphepha le-PET lisebenza kakuhle kwaye liyahlangabezana neemfuno zesalathiso sococeko kazwelonke kwiimveliso ezibunjiweyo kunye neemfuno zokhuseleko lokusingqongileyo. Bakwitheyibhile yokhuseleko lokusingqongileyo. Okwangoku, ukupakishwa kufuneka kuhlangabezene nokhuseleko lokusingqongileyo kunye neemfuno zokuphinda zisetyenziswe, ke ngoko imfuno yamaphepha e-PET iya inyuka ngokunyuka. Eli nqaku lixubusha ngokukodwa inkqubo yokuvelisa kunye neengxaki eziqhelekileyo ze-PET sheets.
Itekhnoloji yokuvelisa i-PET sheet:
(1) Iphepha lePET
Njengezinye iiplastiki, iipropathi ze-PET sheet zihlobene ngokusondeleyo nobunzima bemolekyuli. Ubunzima bemolekyuli bumiselwa yi-intrinsic viscosity. Okukhona iphezulu i-intrinsic viscosity, kokukhona iphucuka imbonakalo yomzimba kunye neekhemikhali, kodwa ulwelo olulambathayo kunye nobunzima bokwenza. Okuya kusezantsi i-viscosity ye-intrinsic, imbi kakhulu iipropathi zomzimba kunye neekhemikhali kunye namandla empembelelo. Ngoko ke, i-intrinsic viscosity ye-PET sheet kufuneka ibe yi-0.8dl/g-0.9dl/g.
(2) Ukuhamba kwenkqubo yokuvelisa
Eyonaizixhobo zokuvelisa i-PET sheetsibandakanya iinqaba zecrystallization, iinqaba zokumisa, ii-extruders, iintloko zokufa, ii-calenders ezintathu-roll kunye neekhoyili. Inkqubo yemveliso yile: izinto eziluhlaza crystallization-drying-extrusion plasticization-extrusion molding-calendaring and shapeing-winding products.
1. ICrystallization. Izilayi ze-PET zifudumala kwaye zifakwe kwi-crystallization tower ukulungelelanisa iamolekyu, kwaye emva koko zandise ukushisa kweglasi yokutshintsha kweengcezu ukukhusela ukunamathela kunye nokuvala i-hopper ngexesha lokumisa. ICrystallization ihlala ilinyathelo elibalulekileyo. ICrystallization ithatha imizuzu engama-30-90 kwaye ubushushu bungaphantsi kwe-149°C.
2.Yomisa. Kwiqondo lokushisa eliphezulu, amanzi aya kuhlamba i-hydrolyze kunye nokunciphisa i-PET, okubangelwa ukunciphisa ukunamathela kwayo, kunye neempawu zayo ezibonakalayo, ngokukodwa amandla empembelelo, ziya kuncipha njengoko ubunzima be-molecular buyancipha. Ngoko ke, ngaphambi kokunyibilika kunye nokukhupha, i-PET kufuneka yomiswe ukunciphisa umthamo womswakama, omele ube ngaphantsi kwe-0.005%. Isixhobo sokumisa amanzi sisetyenziselwa ukomisa. Ngenxa ye-hygroscopicity yezinto ze-PET, xa amanzi engena nzulu kwi-surface yesilayi, iibhondi ze-molecular ziyakwenziwa, kwaye enye inxalenye yamanzi iya kungena nzulu kwiqhekeza, yenza ukomisa kube nzima. Ngoko ke, umoya oshushu oqhelekileyo awunakusetyenziswa. Ubushushu bomoya obushushu bufuneka ukuba bube ngaphantsi kwe -40C, kwaye umoya oshushu ungena kwi-hopper yokumisa ngesekethe evaliweyo ukwenzela ukomiswa okuqhubekayo.
3. Cwina. Emva kwecrystallization kunye nokomisa, i-PET iguqulwa ibe yipolymer enendawo ecacileyo yokunyibilika. Ubushushu bokubumba i-polymer buphezulu kwaye uluhlu lolawulo lobushushu luncinci. I-polyester-specific barrier screw isetyenziselwa ukwahlula amaqhekeza anganyibilikiyo kwi-melt, enceda ukugcina inkqubo yokucheba ixesha elide kunye nokwandisa imveliso ye-extruder. I-Adpts i-flexible lip die with streamlined throttle rod. Intloko yokungunda icolile. Iimbaleki ezilungelelanisiweyo kunye nemilebe yokufa engenamkrwelo ibonisa ukuba ukugqiba kufuneka kube kuhle. Isifudumezi sokungunda sinemisebenzi yokuhambisa amanzi kunye nokucoca.
4.Ukupholisa kunye nokubumba. Emva kokuba i-melt iphuma entloko, ingena ngokuthe ngqo kwi-calender ye-three-roll ye-calendering kunye nokupholisa. Umgama phakathi kwekhalenda ye-roller ezintathu kunye nentloko yomatshini ugcinwa ngokubanzi malunga ne-8cm, kuba ukuba umgama mkhulu kakhulu, ibhodi iya kuba lula kwaye ishwabene, ibangele ukugqiba kakubi. Ukongeza, ngenxa yomgama omde, ukutshatyalaliswa kobushushu kunye nokupholisa kucotha, kwaye i-crystal ijika ibe mhlophe, engayilungele ukuqengqeleka. Iyunithi ye-calendering ye-three-roller iqulethe i-roller ephezulu, ephakathi kunye nesezantsi. I-shaft ye-roller ephakathi ilungisiwe. Ngexesha lokupholisa kunye nenkqubo yokulinganisa, ubushushu bomphezulu we-roller yi-40 ° c-50c. I-shaft ye-roller ephezulu kunye nesezantsi inokunyuka kwaye ihle.
Ixesha lokuposa: Sep-28-2023
