Raws li cov yas engineering nrog cov kev ua tau zoo tshaj plaws, qhov zoo ntawm cov khoom siv polycarbonate (PC) feem ntau yog nyob ntawm qhov kev xaiv tsim nyog thiab kev tswj xyuas meej ntawm cov txheej txheem molding. PC muaj cov viscosity siab, qhov tseem ceeb hygroscopicity, thiab tus cwj pwm thermal tshwj xeeb, uas hais tias nws cov txheej txheem molding yuav tsum sib npaug ntau yam xws li kub, siab, lub sijhawm, thiab cov khoom siv hauv lub xeev kom tsis txhob muaj qhov tsis xws luag thiab ua tiav cov khoom xav tau thiab cov khoom zoo.
Ua ntej molding, PC raw cov ntaub ntawv yuav tsum tau nruj me ntsis qhuav. Vim hais tias PC molecular chains muaj polar carbonate bonds, lawv yooj yim nqus dej los ntawm ib puag ncig. Thaum rhuab, cov dej noo no tuaj yeem ua rau cov tshuaj tiv thaiv hydrolysis, ua rau txo qis hauv molecular hnyav, nyiaj streaks, lossis embrittlement hauv cov khoom. Yog li ntawd, lub tshuab cua kub los yog lub tshuab dehumidifying feem ntau yog siv los ziab cov khoom ntawm ib ncig ntawm 120℃rau 3-4 teev, txo cov dej noo kom qis dua 0.02%.
Txhaj tshuaj molding yog txoj kev ua ntau tshaj plaws rau PC. Lub hauv paus tseem ceeb ntawm cov txheej txheem no yog nyob rau hauv qhov tsim nyog qhov chaw ntawm lub chim kub, pwm kub, thiab txhaj tshuaj ceev. Lub chim kub feem ntau tswj ntawm 260 thiab 300℃kom paub meej txaus plasticization ntawm yaj yam tsis muaj degradation ntau dhau. Qhov kub ntawm lub nozzle yuav tsum qis dua me ntsis ntawm lub taub hau kom tsis txhob poob dej. Cov pwm kub yog feem ntau tswj ntawm 80 thiab 120 degree. Qhov kub pwm siab dua yuav pab ua kom cov dej ntws zoo sib xws thaum lub sij hawm txhaws, txo cov kev ntxhov siab sab hauv thiab kev ua tsov rog, thiab txhim kho qhov gloss. Kev txhaj tshuaj ceev yuav tsum yog nruab nrab; Kev nrawm nrawm tuaj yeem ua rau dav hlau cov cim lossis npuas, thaum qeeb qeeb yuav ua rau cov cim ntws thiab kev ntxhov siab vim qhov tsis sib xws. Kev tuav tuav theem yuav tsum hloov mus kom du, thiab lub siab thiab lub sij hawm yuav tsum tau sib phim rau cov khoom thickness thiab rooj vag tsim kom txo tau qhov sib txawv shrinkage.
Extrusion molding yog tsim rau zus tau tej cov nplooj ntawv, films, thiab profiles. PC yaj viscosity yog rhiab rau shear tus nqi; qhov sib txawv ntawm cov ntsia hlau extruder tau pom zoo los txhim kho plasticization efficiency thiab txo cov keeb kwm thermal. Lub chim kub yuav tsum tau teem rau theem, maj mam nce los ntawm cov seem pub rau lub taub hau tuag kom tsis txhob muaj overheating thiab degradation. Tus tuag lub taub hau khiav yuav tsum tau ceev kom du thiab symmetrical los tiv thaiv weld kab thiab thickness fluctuations. Tom qab molding, cov khoom yuav tsum undergo annealing, piv txwv li, tuav nws ntawm 100-120℃rau ob peb teev kom tso residual molding kev nyuaj siab thiab txhim kho seem stability.
Tshuab moulding tuaj yeem siv los ua cov thawv hollow, tab sis tshwj xeeb yuav tsum tau them nyiaj rau phab ntsa thickness uniformity thiab yaj lub zog tswj. Lub siab viscosity ntawm PC yuav tsum muaj kev txhawb nqa txaus thaum lub sij hawm preform extrusion thiab tshuab molding los tiv thaiv sagging los yog tawg.
Hauv cov ntsiab lus, kev ua tiav ntawm PC molding txheej txheem yog nyob ntawm kev nkag siab tob ntawm cov khoom siv thiab kev tswj xyuas nruj ntawm cov ntsuas ntawm txhua theem. Synergistic optimization ntawm ziab, kub, siab, thiab tom qab- kev kho mob tsis yog tsuas yog ua kom ntseeg tau qhov tseeb ntawm cov khoom zoo li thiab ua tau raws li cov qauv kev ua tau zoo tab sis kuj tseem txuas ntxiv pwm lub neej thiab txhim kho kev tsim khoom. Qhov no yog qhov tseem ceeb heev rau daim ntawv thov ntawm PC hauv siab -precision thiab siab- teb kev ntseeg siab.