Polyethylene Terephthalate, feem ntau abbreviated li PET, yog ntau yam thermoplastic polymer uas muaj nyob rau hauv tsev neeg polyester. Nws yog synthesized los ntawm polycondensation cov tshuaj tiv thaiv ntawm terephthalic acid (PTA) thiab ethylene glycol (EG), ua ib tug linear polymer nrog ib tug molecular mis ntawm (C₁₀H₈O₄)ₙ . PET muaj npe nrov rau nws cov khoom sib xyaw tshwj xeeb, suav nrog kev siv tshuab siab, kev ruaj ntseg zoo heev, tshuaj lom neeg tsis kam, tsis muaj dej noo, thiab qhov pom tseeb zoo kawg nkaus thaum ua tiav. Raws li ib nrab - cov khoom siv crystalline, nws cov crystallinity (feem ntau 30%-60%) tuaj yeem hloov kho los ntawm kev kho cua sov, tso cai rau nws hloov mus rau qhov sib txawv ntawm daim ntawv thov scenarios . Tsis tas li ntawd, PET yog cov khoom siv rov ua dua tshiab, coj tus lej cim "1" (♳), uas ua raws li kev xav tau thoob ntiaj teb rau cov khoom siv ruaj khov. Cov txiaj ntsig zoo no ua rau PET yog ib qho ntawm cov khoom siv dav siv hauv ntau lub lag luam thoob ntiaj teb.
Common Applications of PET
PET's versatility enables nws daim ntawv thov nyob rau hauv ntau lub teb, nrog rau cov lag luam loj tshaj plaws nyob rau hauv ntim thiab textile industries. Hauv kev ntim khoom, nws suav txog ntau dua 55% ntawm kev siv PET thoob ntiaj teb, feem ntau yog siv los tsim cov thawv ntim khoom xws li lub raj mis dej haus (suav txog 70% ntawm PET ntim), cov tais zaub mov, thiab ntim tshuaj. Ua tsaug rau nws cov pob tshab siab, siab tsis kam, thiab tsw ntxhiab- cov khoom tsis pub dawb, PET lub raj mis yog qhov zoo tagnrho rau cov dej haus carbonated, dej ntxhia, kua txiv hmab txiv ntoo, thiab tshuaj yej dej haus, nrog rau qee qhov siab -cov qib ntsuas kub (HR-PET) muaj peev xwm tiv taus 85℃kub filling . Nws kuj tseem siv rau hauv cov ntim khoom hloov tau yooj yim, xws li lub tshuab nqus tsev-cov hnab ntim khoom noj thiab txhuas{10}}plated zaj duab xis rau cov ntaub so ntub dej, vim nws txoj kev ua haujlwm zoo.
Hauv kev lag luam textile, PET hu ua polyester fiber, suav txog 60% ntawm ntiaj teb hluavtaws fibers. Nws yog dav siv nyob rau hauv cov khaub ncaws fabrics (feem ntau blended nrog paj rwb), thermal rwb thaiv tsev khaubncaws sab nraud povtseg, sportswear, thiab automotive upholstery, raws li zoo raws li muaj fibers xws li log cords thiab kev ruaj ntseg 气囊布. Tshaj li cov chaw loj no, PET pom cov ntawv thov hauv cov khoom siv hluav taws xob (xws li, cov yeeb yaj kiab capacitor, cov khoom sib txuas), cov khoom siv hauv tsheb (xws li, cov twj tso kua mis, cov ntaub ntawv sab hauv), cov khoom siv kho mob (xws li, cov koob txhaj tshuaj, cov tshuaj phais), thiab cov khoom siv hluav taws xob photovoltaic.
Cov Kev Xav Tau Tseem Ceeb rau Kev Tsim Cov Precision PET Spheres
Manufacturing precision PET spheres yog ib tug complex txheej txheem uas yuav tsum tau nruj me ntsis tswj ntawm raw cov ntaub ntawv, kev tsis ua hauj lwm, thiab post- kev kho mob cov txheej txheem los xyuas kom meej qhov siab qhov tseeb, uniform nto zoo, thiab ruaj khov kev ua tau zoo. Tsis zoo li cov khoom siv PET zoo tib yam, cov khoom siv tshwj xeeb (feem ntau yog siv hauv cov kabmob, cov khoom siv, cov cuab yeej siv tau zoo, thiab cov khoom siv kho mob) xav tau kev tiv thaiv nruj heev, ua rau kev txhaj tshuaj molding thiab sib tsoo ob txheej txheem tseem ceeb uas txiav txim siab qhov kawg.
1. Kev txhaj tshuaj molding yuav tsum muaj rau Precision PET Spheres
Kev txhaj tshuaj molding yog thawj kauj ruam hauv kev tsim cov PET spheres precision, tso lub hauv paus rau lawv cov duab thiab qhov tseeb qhov tseeb. Vim PET lub siab crystallinity, hygroscopicity, thiab rhiab heev rau qhov kub thiab txias, cov kev cai tseem ceeb hauv qab no yuav tsum tau ua tiav:
Kev npaj raw khoom: PET resin yuav tsum tau qhuav kom huv si ua ntej molding, raws li nws hygroscopic xwm (0.2%-0.4% dej nqus) tuaj yeem ua rau hydrolysis, npuas, nyiaj streaks, thiab txo cov neeg kho tshuab lub zog hauv cov khoom kawg. Cov txheej txheem ziab yuav tsum siv lub tshuab ziab khaub ncaws dehumidifying ntawm 160-180℃rau 4-6 teev, kom ntseeg tau tias cov dej noo noo txo qis dua los yog sib npaug li 0.005%. Qhuav resin yuav tsum muab cia rau hauv ib lub hopper kaw; yog tias raug huab cua ntau tshaj 1 teev, nws yuav tsum tau qhuav dua. Tsis tas li ntawd, cov resin's melt flow rate (MFR) yuav tsum tau tswj raws li qhov loj me-feem ntau 1.5-2.5g / 10min rau molding-qib PET-kom ntseeg tau tias cov melting thiab filling.
Cov khoom siv thiab pwm yuav tsum tau ua: Txhaj tshuaj molding tshuab yuav tsum muaj kev txhim kho plasticizing, nruab nrog PET- tshwj xeeb screws lossis hloov dav dav- lub hom phiaj screws nrog compression piv ntawm 2.8-3.5 . Cov pwm rau precision spheres yuav tsum tau tsim nrog luv luv, du runners thiab polished kab noj hniav / rooj vag kom tsis txhob ntws cov cim thiab cov khoom khaws cia. Lub tshuab kub khiav tau pom zoo los txhim kho kev ua haujlwm ntau lawm thiab ua kom zoo ib yam. Cov pwm kub yuav tsum tau tswj ntawm 60-80 degree; Qhov kub qis dhau ua rau tsis txaus crystallization, thaum kub kub ua rau lub voj voog ntau lawm.
Cov txheej txheem txhaj tshuaj: Kev tswj qhov kub thiab txias yog qhov tseem ceeb - qhov ntsuas kub tau teem rau hauv ntu: 240-250℃(feem ntau pub), 260-270℃(compression seem), 270-280℃(homogenization seem), thiab 265-275℃(nozzle kub). Qhov kub sib txawv yuav tsum tsis pub tshaj 3℃los tiv thaiv PET decomposition thiab yellowing. Kev txhaj tshuaj siab feem ntau yog 80-100MPa, nrog kev txhaj tshuaj nrawm (100-150mm / s) kom txo lub sijhawm txias txias thiab tsis txhob muaj qhov tsis xws luag .保压 siab yuav tsum yog 40% -50% ntawm kev txhaj tshuaj, nrog lub sijhawm tuav ntawm 5-8 vib nas this kom tiv thaiv kom tsis txhob shrinkage. Cov ntsia hlau ceev yog tswj ntawm 80-100r / min kom ntseeg tau tias cov yas zoo ib yam.
2. Kev Sib Tsoo Rau Precision PET Spheres
Tom qab txhaj tshuaj molding, qhov khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob khoob. Cov txheej txheem sib tsoo tau muab faib ua ntau theem, nrog kev tswj hwm nruj ntawm txhua qhov ntsuas kom tsis txhob muaj kev puas tsuaj ntawm qhov chaw thiab qhov tsis zoo:
Ua ntej- Sib tsoo (Rough Sib Tsoo): Cov theem no yog lub hom phiaj kom tshem tawm qhov tsis xws luag ntawm qhov chaw (xws li, burrs, ntws cov cim) thiab kho qhov loj qhov sib txawv. Cov khoom sib tsoo siv kab rov tav cov lej tswj cov pob zeb, nrog siab -phosphorus cam khwb cia hlau lossis alloy cam khwb cia hlau sib tsoo discs (lub khob lub kaum sab xis 10℃-}15 degree, zawj qhov tob 1/3 ntawm txoj kab uas hla). Kev sib tsoo nruab nrab siv W10-W14 pob zeb diamond lossis silicon carbide micro- hmoov, tov nrog cov roj uas tsis muaj viscosity lubricating roj thiab cov tshuaj tiv thaiv hnyav heev. Kev sib tsoo siab yog 1.2-1.6MPa, ceev 9-12r / min, thiab lub sij hawm 20-30min, targeting ib roundness tsawg dua los yog sib npaug rau 0.2μm thiab nto roughness (Ra) tsawg dua los yog sib npaug rau 0.08μm.
Kev sib tsoo zoo: Kev sib tsoo zoo ntxiv txhim kho qhov tseeb qhov tseeb thiab qhov smoothness. Kev sib tsoo nruab nrab yog hloov nrog W5-W7 micro-powder, nrog lub siab txo mus rau 0.8-1.2MPa thiab ceev hloov mus rau 7-10r / min. Lub sijhawm sib tsoo yog 15-25min, ua tiav qhov ntev ntawm ± 0.3μm, roundness tsawg dua lossis sib npaug rau 0.1μm, thiab Ra ntawm Tsawg dua lossis sib npaug rau 0.03μm.
Ultra{0}}Precision Sib Tsoo (Polishing): Rau siab -precision spheres (piv txwv li, G5-G10 qib), ultra- precision sib tsoo los yog chemical mechanical polishing (CMP) yuav tsum tau. Kev sib tsoo nruab nrab siv W0.5-W1.0 pob zeb diamond micro{17}} hmoov, nrog lub siab ntawm 0.3-0.5MPa thiab ceev ntawm 3-6r / min . Lub sij hawm sib tsoo yog 8-15min, ua rau lub ntsej muag zoo li iav nrog Ra Tsawg dua lossis sib npaug ntawm 0.005μm, tsis muaj khawb, thiab tsis muaj qhov pits. Tom qab kev sib tsoo, cov spheres tau siv ntau theem tu (ultrasonic tu, tshuaj tsuag yaug, nqus kom qhuav) kom tshem tawm cov khoom seem thiab cov roj stains.
Kev Tswj Xyuas Zoo Thaum Sib Tsoo: Kev sib tsoo kub yuav tsum tau tswj hauv qab 40℃kom tiv thaiv thermal deformation. Kev sib tsoo disc xav tau kev saib xyuas tsis tu ncua kom tswj tau qhov tiaj tus (tsawg dua lossis sib npaug li 0.005mm) thiab cov duab zawj. Kev ntsuas txoj kab nruab nrab hauv online thiab kuaj ntsuas ntsuas tau ua thoob plaws hauv cov txheej txheem los xyuas kom meej qhov sib txawv ntawm qhov sib txawv, qhov sib txawv, thiab qhov roughness raws li cov qauv (GB / T 308, ISO 3290).
3. Cov Txheej Txheem Xim rau Precision PET Spheres
Coloring precision PET spheres yuav tsum sib npaug ntawm cov xim sib xws, kev ruaj ntseg, thiab lub ntsej muag qhov tseeb -cov xim xim yuav tsum tsis txhob cuam tshuam rau PET cov khoom siv kho tshuab lossis ua rau muaj qhov tsis xws luag. Raws li kev teev ntau lawm thiab precision yuav tsum, cov hauv qab no feem ntau siv:
Masterbatch Coloring (Feem ntau pom zoo): Qhov no yog txoj hauv kev tseem ceeb rau kev tsim cov xim zoo nkauj PET spheres. Xim masterbatch yog ib qho sib xyaw ua ke ntawm cov xim, dispersants, thiab PET carrier resin, ua ntej -mixed thiab granulated . Nws yog tov nrog PET resin ntawm qhov sib piv ntawm 1% -5% ua ntej txhaj tshuaj molding . Qhov zoo muaj xws li cov xim tsis sib xws (tsis pom cov xim pom), cov khoom ruaj khov - rau -batch sib xws, tsis muaj plua plav paug, thiab kev sib raug zoo nrog PET (tsis muaj kev cuam tshuam rau lub zog txhua yam). Cov xim masterbatch yuav tsum tau qhuav ua ke nrog PET resin kom tsis txhob muaj dej noo, thiab cov xim siv yuav tsum muaj qhov kub thiab txias (siab tshaj lossis sib npaug li 300 degree) kom tiv taus qhov kub ntawm 260-280℃molding.
Xim Xim Xim Xim: Haum rau me me -batch, tus kheej xim spheres. Cov kua xim pleev xim los yog xim roj yog raug ntxiv rau PET resin siv lub ntsuas ntsuas ua ntej molding. Nws muaj kev cuam tshuam zoo heev, tswj cov xim meej, thiab tsis muaj plua plav paug. Txawm li cas los xij, cov xim ua kua yuav tsum sib haum nrog PET kom tsis txhob cuam tshuam rau cov resin melting kev ua tau zoo, thiab nws yuav tsum tau muab kaw thaum lub sij hawm cia los tiv thaiv volatilization los yog stratification.
Nto Txheej Xim Xim: Siv rau spheres xav tau kev pom kev cuam tshuam (piv txwv li, nws yog xim hlau luster, xim gradient) yam tsis tau hloov cov mis hauv cov khoom siv. Tom qab kev sib tsoo thiab polishing, spheres raug kho corona los txhim kho qhov nro, ces txau, luam tawm, lossis nqus aluminized nrog cov xim txheej. Cov khoom siv txheej yuav tsum tsis yog - tshuaj lom, hnav- tiv taus, thiab muaj adhesion zoo kom tsis txhob tev. Rau spheres siv nyob rau hauv cov zaub mov lossis kev kho mob, cov txheej yuav tsum ua tau raws li FDA 21 CFR lossis GB 4806 cov qauv kev nyab xeeb.
Kev ceev faj rau xim: Tsis txhob siv cov hmoov xim ncaj qha, vim tias lawv muaj kev sib xyaw ua ke, ua rau xim xim thiab qhov chaw tsis xws luag. Cov tshuaj pleev xim yuav tsum tsis txhob muaj cov hlau hnyav (piv txwv li, txhuas, cadmium) lossis cov khoom tsis zoo. Tom qab cov xim, cov txheej txheem sib tsoo yuav tsum tau hloov kho me ntsis kom ntseeg tau tias cov xim txheej tsis hnav, thiab qhov chaw tiav tsis cuam tshuam.
Xaus
PET cov khoom zoo tshaj plaws ua rau nws yog ib qho khoom siv tseem ceeb hauv kev lag luam niaj hnub no, nrog rau kev siv ntim khoom, textiles, electronics, thiab lwm yam. Manufacturing precision PET spheres yuav tsum nruj tswj kev txhaj tshuaj molding (raw khoom kom qhuav, kub, siab) thiab sib tsoo (ntau-theem ua, parameter optimization) kom ntseeg tau siab thiab nto zoo. Rau cov xim precision spheres, masterbatch coloring yog txoj kev txhim khu kev qha tshaj plaws rau kev tsim khoom loj, thaum ua kua xim thiab txheej txheej txheej yog tsim rau tus kheej lossis siab - kev xav kom zoo nkauj. Nrog rau kev nce qib ntawm kev ua cov thev naus laus zis tsis tu ncua, PET precision spheres yuav ua lub luag haujlwm tseem ceeb hauv kev siab - cov cuab yeej ua tau zoo thiab cov chaw tshwj xeeb.
