Vim tias cov yas muaj lub teeb yuag, zoo toughness, yooj yim rau kev tsim.Qhov zoo ntawm cov nqi qis, yog li hauv kev lag luam niaj hnub thiab cov khoom siv niaj hnub, kev siv cov yas ntau dua los ntawm cov iav, tshwj xeeb tshaj yog nyob rau hauv cov cuab yeej kho qhov muag thiab kev lag luam ntim khoom, tab tom txhim kho sai heev.Txawm li cas los xij, vim qhov yuav tsum tau ua kom pom tseeb, siab hnav tsis kam, thiab zoo cuam tshuam toughness, muaj pes tsawg leeg ntawm cov yas, cov txheej txheem txhaj tshuaj molding, khoom siv.Pwm, thiab lwm yam., yuav tsum tau ua ntau yam haujlwm los xyuas kom meej tias cov yas no (tom qab no hu ua cov yas pob tshab) siv los hloov iav, qhov zoo ntawm qhov chaw yog qhov zoo, kom ua tau raws li qhov yuav tsum tau siv.
Cov pob tshab yas uas siv hauv khw yog polymethyl methacrylate (feem ntau hu ua methacrylate lossis organic iav, code PMMA) thiab polycarbonate (code PC).Polyethylene terephthalate (code PET), pob tshab nylon.AS (acrylene-styrene copolymer), polysulfone (code lub npe PSF), thiab lwm yam, uas peb feem ntau raug rau PMMA.Vim tias qhov chaw tsawg ntawm PC thiab PET peb cov yas, cov hauv qab no siv peb cov yas no los ua piv txwv los tham txog cov yam ntxwv ntawm cov yas pob tshab thiab cov txheej txheem txhaj tshuaj molding.
Kev ua tau zoo ntawm pob tshab yas
Cov pob tshab yas yuav tsum muaj cov pob tshab siab ua ntej, ua raws li qee qhov ntawm lub zog thiab hnav tsis kam, tuaj yeem tiv thaiv kev poob siab, qhov chaw tiv thaiv tshav kub yog qhov zoo, tshuaj tiv thaiv zoo heev, thiab dej nqus dej me me.Tsuas yog nyob rau hauv txoj kev no nws tuaj yeem siv los ua kom tau raws li qhov yuav tsum tau ua ntawm pob tshab.Kev hloov mus sij hawm ntev.PC yog qhov kev xaiv zoo tshaj plaws, tab sis feem ntau vim yog tus nqi siab ntawm nws cov khoom siv raw thiab qhov nyuaj ntawm kev txhaj tshuaj molding, nws tseem siv PMMA ua qhov kev xaiv tseem ceeb (rau cov khoom siv feem ntau), thiab PPT yuav tsum tau ncab kom tau txais cov khoom zoo. .Yog li ntawd, nws feem ntau yog siv rau hauv ntim thiab ntim.
Tej teeb meem uas yuav tsum tau pom thaum lub sij hawm txhaj tshuaj ntawm pob tshab yas
Vim yog lub teeb permeability siab ntawm cov yas pob tshab, nws yog ib qho inevitable uas qhov zoo ntawm cov khoom yas yuav tsum nruj, thiab yuav tsum tsis muaj cov cim, stomata, thiab whitening.Fog Halo, dub me ntsis, discoloration, tsis zoo luster thiab lwm yam tsis xws luag, yog li nyob rau hauv lub txhaj tshuaj molding txheej txheem ntawm raw khoom, khoom siv.Pwm, txawm tias tus tsim ntawm cov khoom, yuav tsum tau ceev faj heev thiab muab tso rau pem hauv ntej nruj los yog txawm yuav tsum tau tshwj xeeb.
Thib ob, vim tias cov yas pob tshab muaj lub siab melting point thiab cov dej tsis zoo, txhawm rau kom ntseeg tau tias qhov zoo ntawm cov khoom, nws yog ib qho tsim nyog yuav tsum tau hloov me me hauv cov txheej txheem tsis xws li chim kub, txhaj tshuaj, thiab txhaj tshuaj ceev, yog li. tias cov yas tuaj yeem ntim nrog pwm.Nws tsis tsim kev ntxhov siab sab hauv thiab ua rau cov khoom deformation thiab tawg.
Rau cov khoom siv thiab cov pwm xav tau, cov txheej txheem txhaj tshuaj molding thiab cov khoom siv raw ntawm cov khoom, los tham txog cov teeb meem uas yuav tsum tau sau tseg:
Kev npaj thiab ziab ntawm cov khoom siv raw vim muaj ib qho kab ntawm impurities hauv cov yas yuav cuam tshuam rau qhov pom ntawm cov khoom, thiab yog li khaws cia thiab kev thauj mus los.
Thaum lub sij hawm noj cov txheej txheem, yuav tsum tau them nyiaj mloog mus rau sealing thiab xyuas kom meej tias cov ntaub ntawv raw yog huv si.Tshwj xeeb, cov khoom siv raw muaj cov dej noo, uas ua rau cov khoom siv raw khoom deteriorate tom qab cua sov.Yog li ntawd, nws yuav tsum tau qhuav, thiab thaum molding, qhuav Hopper yuav tsum tau siv.Nws tseem yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias thaum lub sij hawm ziab, cov cua nkag yuav tsum zoo dua yog lim thiab dehumidified kom paub tseeb tias nws yuav tsis ua phem rau cov khoom siv raw.
Ntxuav cov raj, screws thiab accessories
Txhawm rau tiv thaiv kev kis kab mob ntawm cov khoom siv raw thiab muaj cov khoom qub lossis impurities hauv cov ntsia hlau thiab cov khoom siv kev nyuaj siab, cov resin nrog cov thermal stability tsis zoo yog tam sim no.Yog li ntawd, cov ntsia hlau tu cov neeg ua haujlwm yog siv los ntxuav cov khoom ua ntej siv thiab tom qab kaw, kom lawv yuav tsum tsis txhob lo rau impurities., Thaum tsis muaj ntsia hlau tu tus neeg saib xyuas, PE, PS thiab lwm yam resin tuaj yeem siv los ntxuav cov ntsia hlau.
Thaum kaw ib ntus, txhawm rau tiv thaiv cov khoom siv raw los ntawm qhov kub thiab txias rau lub sijhawm ntev thiab ua rau poob, qhov kub ntawm lub tshuab ziab khaub ncaws thiab lub thoob yuav tsum tau txo, xws li qhov kub ntawm lub PC, PMMA thiab lwm cov raj. yuav tsum tau txo qis dua 160 ° C.(Hopper kub yuav tsum qis dua 100 ° C rau PC)
Teeb meem hauv kev tsim tuag (nrog rau cov khoom tsim).
Txhawm rau tiv thaiv cov tsos mob tsis zoo rov qab los, los yog qhov txias tsis sib xws uas ua rau cov yas tsis zoo, ua rau muaj qhov tsis zoo ntawm qhov chaw thiab deterioration.
Feem ntau hauv kev tsim pwm, yuav tsum tau them sai sai rau cov ntsiab lus hauv qab no:
Phab ntsa thickness yuav tsum zoo ib yam li qhov ua tau, demoulding txoj kab nqes yuav tsum loj txaus;
Qhov kev hloov pauv yuav tsum yog maj mam.Txoj kev hloov du kom tiv thaiv cov ces kaum ntse.Ntse ntug tiam, tshwj xeeb tshaj yog cov khoom PC yuav tsum tsis muaj qhov khoob;
Lub rooj vag.Cov channel yuav tsum dav thiab luv li sai tau, thiab lub rooj vag txoj hauj lwm yuav tsum tau teem raws li cov txheej txheem shrinkage condensation.Yog tias tsim nyog, qhov dej txias yuav tsum tau ntxiv;
Qhov saum npoo ntawm cov pwm yuav tsum du thiab tsis tshua muaj roughness (zoo dua tsawg dua 0.8);
Tshem tawm.Lub tank yuav tsum txaus kom tso pa tawm hauv huab cua thiab roj hauv lub sijhawm;
Tsuas yog PET, phab ntsa tuab yuav tsum tsis txhob nyias dhau, feem ntau tsis tsawg dua lmm;
Cov teeb meem rau Kev Ceeb Toom hauv Kev Txhaum Cai (nrog rau cov kev cai rau kev txhaj tshuaj molding tshuab).
Txhawm rau txo qis kev ntxhov siab sab hauv thiab qhov tsis zoo ntawm qhov chaw, kev saib xyuas yuav tsum tau them rau cov hauv qab no hauv cov txheej txheem txhaj tshuaj:
Lub tshuab txhaj tshuaj molding tshuab nrog cov ntsia hlau tshwj xeeb thiab cais qhov ntsuas kub yuav tsum raug xaiv;
Kev txhaj tshuaj kub yuav tsum siab dua nyob rau hauv qhov chaw uas cov yas resin tsis decompose;
Kev txhaj tshuaj siab: Feem ntau siab dua, txhawm rau kov yeej qhov tsis xws ntawm cov yaj viscosity loj, tab sis lub siab siab dhau lawm yuav ua rau muaj kev ntxhov siab sab hauv uas ua rau muaj teeb meem demolding thiab deformation;
Txhaj ceev: Nyob rau hauv cov ntaub ntawv ntawm txaus siab filling hom, feem ntau tsawg, nyiam dua qeeb-ceev-slow multi-theem txhaj tshuaj;
Lub sij hawm tuav lub sij hawm thiab lub sij hawm tsim: Nyob rau hauv cov ntaub ntawv ntawm txaus siab cov khoom filling, tsis muaj kev nyuaj siab los yog npuas generated;Nws yuav tsum yog luv li sai tau kom txo tau lub sij hawm siv ntawm lub fuse;
Screw ceev thiab rov qab siab: nyob rau hauv lub premise ntawm satisfying lub plasticized zoo, nws yuav tsum tau tsawg li sai tau los tiv thaiv tau decompression;
Tuag kub: Qhov txias ntawm cov khoom yog qhov zoo los yog phem, thiab nws muaj kev cuam tshuam zoo rau qhov zoo.Yog li ntawd, qhov kub kub tuag yuav tsum muaj peev xwm tswj tau cov txheej txheem kom raug.Yog tias ua tau, pwm kub yuav tsum siab dua.
Lwm yam
Txhawm rau tiv thaiv qhov tsis zoo ntawm qhov saum npoo zoo, kev siv cov tshuaj demoulding tsawg li sai tau thaum molding;Thaum siv rov qab cov ntaub ntawv yuav tsum tsis txhob ntau tshaj 20.
Rau cov khoom lag luam uas tsis yog PET, kev rov ua dua yuav tsum tau ua kom tshem tawm cov kev ntxhov siab sab hauv, PMMA yuav tsum qhuav ntawm 70-80 ° C rau 4 teev;PC yuav tsum nyob hauv huab cua huv, glycerin.Kua paraffin yog rhuab ntawm 110-135 ° C, nyob ntawm cov khoom, thiab yuav siv sij hawm txog 10 teev.PET yuav tsum dhau los ntawm ob txoj kev ncab kom tau txais kev ua haujlwm zoo.
III.Txhaj molding txheej txheem ntawm pob tshab yas
Txheej txheem cov yam ntxwv ntawm pob tshab yas
Ntxiv nrog rau cov teeb meem saum toj no, cov yas pob tshab kuj muaj qee yam txheej txheem, uas tau piav qhia hauv qab no:
1. PMMA txheej txheem yam ntxwv
PMMA muaj viscosity loj thiab me ntsis dej tsis zoo.Yog li ntawd, nws yuav tsum tau txhaj tshuaj nrog cov khoom siv kub thiab kev txhaj tshuaj siab.Cov nyhuv ntawm kev txhaj tshuaj kub yog ntau dua li qhov kev txhaj tshuaj siab, tab sis qhov kev txhaj tshuaj siab yog nce, uas yog qhov zoo rau kev txhim kho tus nqi shrinkage ntawm cov khoom.
Kev txhaj tshuaj kub ntau yog dav, qhov kub ntawm qhov kub yog 160 ° C, thiab qhov kub decomposition yog 270 ° C.Yog li ntawd, cov khoom siv kub tswj qhov ntau yog dav thiab cov txheej txheem zoo.Yog li ntawd, kev txhim kho liquidity tuaj yeem pib nrog kev txhaj tshuaj kub.Qhov cuam tshuam tsis zoo, hnav tsis kam yog qhov tsis zoo, yooj yim txiav paj, yooj yim rau tawg, yog li yuav tsum nce pwm kub, txhim kho cov txheej txheem condensation, kom kov yeej cov teeb meem no.
2. PC txheej txheem yam ntxwv
Lub PC muaj viscosity loj, siab melting kub, thiab tsis muaj fluidity.Yog li, nws yuav tsum tau molded ntawm qhov kub siab dua (nruab nrab ntawm 270 thiab 320 ° C).Cov khoom siv kub tswj qhov ntau yog qhov nqaim thiab cov txheej txheem tsis zoo li PMMA.Kev txhaj tshuaj siab tsis tshua muaj txiaj ntsig ntawm fluidity, tab sis vim qhov loj viscosity, nws tseem yuav tsum tau txhaj tshuaj.Txhawm rau tiv thaiv kev ntxhov siab sab hauv, lub sijhawm tuav yuav tsum luv li sai tau.
Lub shrinkage tus nqi yog qhov loj thiab qhov loj yog qhov ruaj khov, tab sis qhov kev ntxhov siab sab hauv ntawm cov khoom yog loj thiab nws yooj yim rau tawg.Yog li ntawd, nws raug nquahu kom txhim kho cov dej ntws los ntawm kev nce qhov kub thiab txias ntau dua li qhov siab, thiab txo qhov muaj peev xwm ntawm kev tawg los ntawm kev nce pwm kub, txhim kho pwm qauv thiab tom qab kev kho mob.Thaum qhov kev txhaj tshuaj ceev yog tsawg, cov dips yog nquag ripples thiab lwm yam tsis xws luag.Qhov hluav taws xob qhov ncauj kub yuav tsum tau tswj nyias, qhov pwm kub yuav tsum siab, thiab qhov ntws channel thiab lub qhov rooj tiv thaiv yuav tsum me me.
3. PET txheej txheem cov yam ntxwv
PET molding kub yog siab, thiab cov khoom siv kub tswj qhov ntau yog nqaim (260-300 ° C), tab sis tom qab melting, fluidity yog qhov zoo, yog li cov txheej txheem tsis zoo, thiab cov khoom siv los tiv thaiv feem ntau ntxiv rau lub nozzle. .Mechanical zog thiab kev ua tau zoo tom qab txhaj tshuaj tsis siab, yuav tsum yog los ntawm cov txheej txheem tensile thiab kev hloov kho kom zoo dua qub.
Kev tswj kub tuag yog qhov tseeb, yog los tiv thaiv warping.Yog li ntawd, nws yog pom zoo kom siv kub channel tuag.Qhov kub ntawm cov pwm yuav tsum siab, txwv tsis pub nws yuav ua rau qhov sib txawv gloss thiab qhov nyuaj ntawm demoulding.
Qhov tsis xws luag thiab kev daws teeb meem rau pob tshab yas qhov chaw
Tej zaum muaj qhov tsis xws luag hauv qab no:
Nyiaj kab
Vim muaj kev cuam tshuam ntawm Anisotropy ntawm kev ntxhov siab sab hauv thaum lub sij hawm txhaws thiab condensation, qhov kev ntxhov siab tsim nyob rau hauv txoj kab ntsug ua rau cov resin ntws mus rau hauv kev taw qhia, thaum cov kev taw qhia tsis ntws ua rau qhov sib txawv refractive index thiab ua rau flash silk kab.Thaum nws nthuav dav, Tej zaum yuav ua rau tawg ntawm cov khoom.Ntxiv nrog rau cov txheej txheem txhaj tshuaj thiab pwm xim, cov khoom zoo tshaj plaws rau kev kho mob annealing.Yog tias cov khoom siv PC tuaj yeem ua kom sov siab tshaj 160 ° C rau 3-5 feeb, nws tuaj yeem ua kom txias.
Npuas
Cov roj av thiab lwm yam roj av uas feem ntau nyob rau hauv cov resin tsis tuaj yeem tso tawm, (nyob rau hauv cov txheej txheem ntawm tuag condensation) los yog vim tsis txaus filling, lub condensation nto yog ceev heev thiab condenses los ua ib lub tshuab nqus tsev npuas.
Tsis zoo nto gloss
Qhov laj thawj tseem ceeb yog qhov pwm roughness loj, thiab ntawm qhov tod tes, qhov condensation yog ntxov dhau los ua rau cov resin tsis tuaj yeem luam tawm ntawm cov pwm.Tag nrho cov no ua rau saum npoo ntawm pwm me ntsis tsis sib xws thiab ua rau cov khoom poob luster.
Cov qauv poob siab
Nws yog hais txog cov ripples uas tsim los ntawm lub qhov rooj ncaj qha.Yog vim li cas yog vim lub viscosity ntau dhau ntawm cov yaj, cov khoom siv hauv ntej kawg tau condensed nyob rau hauv kab noj hniav, thiab tom qab ntawd cov khoom tawg los ntawm qhov condensation nto, ua rau saum npoo tshwm.
Dawb huab Halo
Nws feem ntau tshwm sim los ntawm cov plua plav poob rau hauv cov khoom siv raw hauv huab cua lossis cov ntsiab lus ntawm cov khoom siv raw yog loj heev.
Dawb pa luam yeeb dub
Feem ntau yog vim cov yas hauv lub thoob, vim lub hauv paus overheating los ntawm decomposition los yog deterioration ntawm lub chim resin thiab tsim.
Post lub sij hawm: Mar-23-2020