Inkqubo yokuveliswa kwePhepha le-PET

Imathiriyeli ekrwada ye-PET sheet #pet sheet extrusion

Iphepha le-PET, njengezinye iiplastiki, ukusebenza kunxulumene ngokusondeleyo nobunzima bemolekyuli, kwaye uphawu lwe-viscosity lumisela ubunzima bemolekyuli. Inkulu i-viscosity yangaphakathi, eyona nto ingcono yeempawu zomzimba kunye neekhemikhali. kodwa fluidity amahlwempu, kubangela ubunzima ukubumba. Isezantsi i-viscosity yangaphakathi, imbi kakhulu yeempawu ze-physicochemical kunye namandla empembelelo. Ngoko ke, i-0.8dl/ G-0.9dL / g kufuneka ikhethwe kwi-viscosity yeempawu zefilimu ye-PET ebonakalayo.

Inkqubo yokuvelisa i-PET #extrusora de garrafa pet

Izixhobo eziphambili zemveliso ye-PET yephepha elicacileyo yile: i-crystallization tower, i-drying tower, i-extruder, intloko ye-mold, i-calender emithathu kunye ne-coiler.

Inkqubo yemveliso imi ngolu hlobo lulandelayo: imathiriyeli ekrwada icrystallization → ukomisa → iplastikhi ye-extrusion → i-extrusion molding → i-calendering molding → iimveliso zokujija.

Inyathelo lokuqala yicrystallization. Iziqwenga ze-PET zifudumala kwaye zifakwe kwi-crystallization tower, ukwenzela ukuba iamolekyu zicwangciswe kakuhle, kwaye emva koko i-glass transition ye-slices iphakanyisiwe, ejoliswe ekukhuseleni ukunamathela ngexesha lokumisa kunye nokuvimbela i-hopper. ICrystallization ngokuqhelekileyo linyathelo eliyimfuneko, elithatha imizuzu engama-30 ukuya kwimizuzu engama-90, kwaye ubushushu bungaphantsi kwe-149°C.

Inyathelo lesibini, yomile. Ngenxa yokuthotywa kwe-hydrolytic ye-PET ebangelwa ngamanzi phantsi kweemeko eziphezulu zokushisa, ukunamathela kwayo okubonakalayo kuyancipha, kwaye iimpawu zayo ezibonakalayo, ngokukodwa amandla empembelelo, ziya kuncitshiswa ngokunciphisa ubunzima be-molecular. Ngoko ke, i-PET kufuneka yomiswe ngaphambi kokuba inyibilike kunye ne-extrusion ukunciphisa umthamo womswakama, kwaye umxholo wokufuma kufuneka ube ngaphantsi kwe-0.005%. Ngenxa yepropathi ye-hygroscopic yezinto ze-PET, amanzi anzulu kumphezulu wesilayi aya kwenza iibhondi zeemolekyuli, kwaye amanzi athile aya kubakho nzulu ngaphakathi kwisilayi, okukhokelela kubunzima bokoma, ngoko ke umoya oshushu ngokubanzi awunakusetyenziswa. Iqondo lombethe lomoya oshushu lifunekayo ukuba libe ngaphantsi kwe-40 ° C, kwaye umoya oshushu udluliselwe kwisiphaluka esivaliweyo ukuya kwi-hopper yokumisa ngokuqhubekayo. #pe extruder machine.

Imifanekiso ebonisiweyo ivela kumzi mveliso weJWELL Turkey ngoSeptemba. Emva kokuhanjiswa ukusuka kumzi-mveliso we-Jwell ukuya kwifatory yomxhasi waseTurkey, injineli ye-Jwell yaya kumzi-mveliso ukuze ifake umatshini we-PET we-extrusion wephepha lokupakisha i-thermoforming. #rpet ukuphinda kusetyenziswe iplastiki

Inyathelo lesithathu kukubumba extrusion. I-PET iguqulwa ibe yipolymer enendawo yokunyibilika ebonakalayo emva kwekristali kunye nokomisa, kwaye ubushushu bokubumba bepolymer buphezulu kwaye uluhlu lokulawula ubushushu luncinci. Amasuntswana anganyibilikiyo ahlulwe kwinyibilika esebenzisa isikrufu somqobo esenzelwe ngokukodwa ipolyester, enceda ukugcina inkqubo yokucheba ende kunye nokwandisa imveliso ye-extruder. Intloko ye-flexible die lip kunye ne-flow line stopper rod isetyenzisiweyo, intloko i-conical, i-streamlined flow channel kunye ne-non-scratch die lip ibonisa ukuba iphepha kufuneka libe lihle, i-heater yentloko inomsebenzi wokucoca kunye nokucoca, intloko die umsantsa imilebe kufuneka uqinisekise ukufana okulungileyo, intloko die umsantsa umlebe ukufana ukufana ngqo kuchaphazela ukutenxa ukutyeba ezinqamlezayo sheet kunye flatness le calendering. Iqondo lokushisa elihambelana nommandla wangaphambili, indawo ephakathi kwefuselage, indawo yangasemva yefuselage, umtshini womnatha kunye nentloko ngokulandelanayo 240 ° C-260 ° C, 265 ° C-275 ° C, 260 ° C- 265°C, 260°C-265°C, 255°C-265°C. #umatshini wephepha lesilwanyana

Inyathelo lesine: Pholisa kwaye usete. Emva kokuba ukunyibilika kuphuma entloko ngqo kwi-calender ye-tatu-roll ye-calender kunye nokupholisa, umgama phakathi kwe-calender ye-roll-roll kunye nentloko igcinwe ngokubanzi malunga ne-8cm, kuba ukuba umgama mkhulu kakhulu, iphepha lilula. ukuhexa kunye nemibimbi, okukhokelela ekugqityweni kakubi kwamaphepha. Ukongeza, ngenxa yomgama ogqithisileyo, ukupholisa ukutshatyalaliswa kobushushu kucotha kakhulu kwaye i-crystallization imhlophe, engayilungelelanisa i-calendering. Iyunithi emithathu ye-calendering ye-roller iqulethe i-roller ephezulu, ephakathi kunye nesezantsi ephantsi, umgca we-roller ophakathi ugxininisekile, kunye ne-axis ye-roller ezimbini eziphezulu kunye nezantsi zingashukunyiswa phezulu naphantsi xa ubushushu bomgangatho we-roll bungama-40 ° C. -50 °C ngexesha lokupholisa ikhalenda. Ngokunyuka kunye nokuhla kwi-axis ukulungelelanisa i-gap roll, ubushushu be-roller ezimbini eziphezulu kunye nezantsi zi-30 ° C-60 ° C, 52 ° C-68 ° C, ngokulandelanayo, ii-roller ezintathu kufuneka ziqinisekise ukuba isantya ungqamaniso, isantya kufuneka sibe ngaphezu kwesantya extrusion, injongo kukuphelisa ukwandiswa kwezinto eshiya die kwaye buthathaka uxinzelelo lwangaphakathi sheet, ukuze imibimbi zinyamalale. I-PET iya kuvelisa i-crystallization kwi-100 ° C ukuya kwi-250 ° C, kwaye izinga le-crystallization liyi-140 ° C ukuya kwi-180 ° C xa likhawuleza, ngoko i-crystallization ingagqitywa kwimizuzwana embalwa. I-PET idinga ukudlula ngokukhawuleza kule ndawo yobushushu bekristali kwaye ilawule ngokungqongqo iqondo lobushushu lemiqulu emithathu.

Inyathelo lesihlanu: Tsala kwaye urhole. Iphepha liphuma nge-calender roller kwaye lingena kwisixhobo sokutsala nge-roller yesikhokelo. Isixhobo sokutsala siqulunqwe ngerola yerabha esebenzayo kunye ne-roller ye-rubber esebenzayo, kwaye uxinzelelo lwee-roller ezimbini lukhusela ikakhulu i-sheet ukuba ibe mcaba xa ishidi litsalwa zii-roller ezimbini kwisixhobo sokujija.