Xauv LGF PBT Lub Zog Muaj Zog
Nyob rau hauv lub hiav txwv loj ntawm engineering plastics, PBT feem ntau suav hais tias yog "tus qauv tivthaiv" - nws yog ib qho txuas, ib lub tsev relay, thiab qhov "muaj txiaj ntsig zoo tab sis muaj kev cuam tshuam" crystalline polymer. Txawm li cas los xij, thaum peb qhia qhov sib txawv "ntev iav fiber ntau" rau hauv lub ntiaj teb lattice ntawm PBT, qhov kev hloov pauv zoo tshwm sim hauv chemistry thiab physics.
Niaj hnub no, peb yuav tsis tham txog cov qauv kev xeem ASTM dull, tab sis hloov, dhau los ntawm peb qhov kev xav tsis zoo ntawm kev kho pob txha, kev sib tw ib puag ncig, thiab kev kos duab, peb yuav rov qab- tshuaj xyuas qhov tseeb ntawm LGF PBT sib xyaw hauv kev lag luam niaj hnub.
LGF PBT: Txoj Kev Tsim Kho
Txhawm rau kom nkag siab qhov txawv ntawm LGF PBT compound resin, ib qho yuav tsum xub taug qab nws keeb kwm.
Ordinary luv iav fiber (SGF) PBT pellet yog "sib xyaw" ua ke: luv fibers thiab resin raug mob hnyav shearing thiab kneading nyob rau hauv ib tug ntxaib- ntsia hlau extruder, uas ua rau cov fibers zoo li gravel tawg rau ntawm pob zeb, nrog ib tug ntev ntawm 0.2-0.4 hli.
LGF PBT yas granules yog "immersed" nyob rau hauv cov txheej txheem no. Nws yog txheej txheem hu ua Melt Impregnation.
Xav txog qhov txuas txuas ntxiv ntawm cov iav fibers raug rub los ntawm cov molten PBT resin channel zoo li cable. Cov resin yuav tsum tau nkag mus rau txhua tus neeg filament nyob rau lub sijhawm luv luv, siv cov tshuaj capillary. Qhov no tsis yog tsuas yog lub cev encapsulation, tab sis kuj muaj tshuaj sib txuas ntawm lub interface. Tom qab txias thiab granulation, qhov ntev ntawm cov khoom yog tib yam li qhov ntev ntawm cov fibers (feem ntau yog 10-12 hli, nrog rau ntau txog 5-25 hli).
Kev Pom Kev Lag Luam: Qhov kev sib txawv ntawm cov thev naus laus zis no txiav txim siab qhov txiaj ntsig zoo ntawm LGF PBT cov ntaub ntawv. Nws tsis yog kev sib xyaw ua ke ntawm "yas thiab iav fibers"; nws yog pre-ua micro- cov khoom sib xyaw. Yog tias SGF zoo li cov tub rog ib leeg, LGF zoo li lub qhov dej - cov tub rog tau npaj, ib txwm npaj txhij mus rau hauv kev txhaj tshuaj molding.
Microscopic engineering ntawm GF PBT Khoom
Thaum LGF PBT yog txhaj tshuaj- molded, microscopic engineering kiv puag ncig tshwm sim hauv nws cov qauv sab hauv.
Noog Nest Effect
Hauv SGF PBT compound resin, cov fibers raug cais thiab ntab. Thaum nyob hauv LGF PBT, txawm hais tias cov fibers ntev tau tawg rau hauv cov ntsia hlau, qhov zoo tshaj plaws lawv tseem khaws qhov ntev ntawm 2-5 hli. Cov fibers no interlock thiab intertwine nrog ib leeg nyob rau hauv lub pwm kab noj hniav, tsim ib tug peb-dimensional interlocking network zoo li "noog lub zes".Lub network no tso cai rau cov khoom siv nrog tus kheej - txhawb nqa. Thaum qhov kub thiab txias (ze ze rau lub melting point ntawm PBT), lub matrix resin tau softened, tab sis cov fiberglass lub moj khaum no tseem ua rau cov khoom tswj nws cov duab macroscopic. Qhov no yog vim li cas qhov kub distortion kub (HDT) ntawm LGF PBT polymer tuaj yeem ncav cuag lub melting point ntawm resin.
Rub-Txoj Haujlwm thiab Fracture Mechanism
Thaum muaj kev cuam tshuam sab nraud tshwm sim, SGF PBT cov khoom sib xyaw feem ntau nthuav tawm cov pob txha tawg - ib zaug cov ntaub ntawv tawg, nws nkag mus rau hauv matrix sai. Txawm li cas los xij, LGF PBT qhia txog lub zog ua kom tsis muaj zog. Thaum lub sij hawm nthuav dav ntawm qhov tawg, nws ntsib qhov cuam tshuam ntawm cov fibers ntev thiab raug yuam kom tig, bifurcate. Qhov tseem ceeb tshaj, txhawm rau rhuav tshem cov qauv no, nws yog ib qho tsim nyog yuav tsum tau yuam "rub tawm" lub qhov txhab fibers los ntawm matrix. Qhov "fiber rub- tawm haujlwm" no yuav tsum muaj zog ntau dua li tsuas yog rhuav tshem cov fibers.
Daim Ntawv Thov Kev Pom Zoo: Qhov no kuj yog vim li cas LGF PBT yas pellet tuaj yeem hloov cov hlau nyob rau hauv pem hauv ntej module ntawm lub tsheb lossis cov ncej ntawm qhov cuam tshuam bar - nws tsis yog ib qho nyuaj, tab sis kuj muaj hom tsis ua haujlwm, uas tuaj yeem nqus lub zog kinetic thaum sib tsoo es tsis txhob ua rau tawg tawg.
Peb Yuav Tsum Ua Dab Tsi?
Qhov nyuaj tshaj plaws ntawm kev siv LGF PBT compound resin tsis yog cov khoom siv mis, tab sis kev txwv tsis pub siv cov txheej txheem ua. Qhov no yog qhov zoo tshaj plaws paradox ntsib los ntawm kev txhaj tshuaj molding engineers. Peb siv nyiaj ntau ntawm cov fibers ntev, tab sis nws yooj yim heev los hloov lawv mus rau hauv cov fibers luv luv thaum ua.
Txhawm rau kom ua tiav cov txheej txheem plasticization, cov txheej txheem ib txwm nyiam kev sib hloov ceev, siab rov qab siab thiab siab shear quab yuam. Tab sis qhov no yog kev puas tsuaj rau LGF. Lub zog shear yog zoo li ib nkawm txiab, uas yuav tam sim ntawd shred lub fibers. Ua LGF PBT yuav tsum muaj lub suab nrov nrov:
Tsawg rov qab siab:Tsuas yog cov ntsia hlau yuav tsum tau thawb rov qab.
Tsawg rotational ceev:Txo cov neeg kho tshuab shearing.
Deep ntsia hlau groove:Muab qhov chaw rau fiber ntau ntws.
Lub rooj vag dav:Cov koob tshuaj ib txwm siv -point rooj vag raug txwv. Qhib nozzles thiab sab rooj vag yuav tsum tau siv los tso cai rau cov fibers ntws mus rau hauv lub pwm kab noj hniav.
LGF Composite: Kawg Frontiers
Thaum peb tham txog LGF PBT, peb tab tom hais txog qhov "dej tob" ntawm lub teeb hnyav hauv kev lag luam tsheb.
Hauv 1.0 era, lub teeb hnyav tau ua tiav los ntawm kev siv cov yas rau cov khoom siv sab hauv. Nyob rau hauv lub 2.0 era, LGF PBT compound resin yog hloov lub cheeb tsam uas yog Ameslikas nyob los ntawm hlau: lub qhov rooj module systems, sunroof thav ntawv, thiab windshield wiper motor vaj tse.
Hauv cov cheeb tsam no, cov neeg sib tw yog cam khwb cia txhuas -magnesium alloys. Lub zog tseem ceeb ntawm LGF PBT yas granules nyob rau hauv nws tsis kam mus creep.
Cov hlau tsis tshua muaj kev nkag mus. Cov yas zoo tib yam yuav maj mam deform zoo li lub khob noom cookie thaum raug rau lub sijhawm ntev - kev ntxhov siab. Txawm li cas los xij, LGF PBT, ua tsaug rau nws lub hauv paus kev sib koom ua ke, nthuav tawm qhov kev cia siab ntawm qhov muaj zog nyob rau hauv qhov kub thiab txias (xws li 80℃- 120℃) thiab ntev - lub sijhawm thauj khoom. Qhov no txhais tau hais tias thaum cov hlau ntxig (cov txiv ntseej, bushings) tau muab tso rau hauv LGF PBT cov khoom, txawm tias tom qab xyoo ntawm kev co thiab thermal cycling, lawv nyob ruaj khov nyob rau hauv qhov chaw tsis muaj loosening.
LGF PBT yas pellet tsis yog khoom siv thoob ntiaj teb. Nws yog kim dua li PBT zoo tib yam, nyuaj rau txheej txheem, thiab nws qhov chaw tsis zoo li ci.
Txawm li cas los xij, los ntawm kev txi kev ua kom yooj yim thiab zoo nkauj ntawm qhov chaw, nws tau txais txiaj ntsig zoo ntawm cov qauv rigidity, seem stability, thiab qaug zog. Nyob rau hauv cov cheeb tsam uas xav tau lub teeb thiab rwb thaiv tsev ntawm cov yas, tab sis kuj xav tau kev ntseeg siab ntawm cov hlau, LGF PBT tam sim no yog ib qho ntawm ob peb yam khoom siv engineering uas tuaj yeem ua tiav qhov sib txawv.
