Ntsia hlau yog qhov tseem ceeb tshaj plaws ntawmextruder, tuaj yeem hais tias yog lub plawv ntawm extruder, nws tuaj yeem cuam tshuam ncaj qha rau daim ntawv thov ntawm extruder thiab ntau lawm efficiency.Kev ua tau zoo ntawm cov ntsia hlau txiav txim siab cov khoom tsim tau, plasticizing zoo, dispersion ntawm muab tub lim, yaj kub thiab lub zog noj ntawm extruder.
Ntsia hlau yog qhov tseem ceeb tshaj plaws ntawm extruder, tuaj yeem hais tias yog lub plawv ntawm extruder, nws tuaj yeem cuam tshuam ncaj qha rau daim ntawv thov ntawm extruder thiab ntau lawm efficiency.Kev ua tau zoo ntawm cov ntsia hlau txiav txim siab cov khoom tsim tau, plasticizing zoo, dispersion ntawm muab tub lim, yaj kub thiab lub zog noj ntawm extruder.Los ntawm cov ntsia hlau tig, lubpolymer yas tuaj yeem extruded, thiab cov yas tuaj yeem txav tau, nias thiab tau txais qee qhov cua sov los ntawm kev sib txhuam hauv lub tog raj kheej.Thaum lub sijhawm txav ntawm lub tog raj kheej, cov yas tuaj yeem sib xyaw thiab plasticized.
- 1.Cov ntsia hlau qauv ntawm polymer plasticizing thiab sib xyaw extruder.
Thaum lub sij hawm ua, thaum cov khoom txav mus rau pem hauv ntej ntawm cov ntsia hlau, nws muaj kev hloov pauv hauv qhov kub, siab, viscosity, thiab lwm yam, uas txawv nyob rau hauv tag nrho ntev ntawm cov ntsia hlau.Muaj peb lub cev lub cev ntawm polymer yas hauv extruder: iav xeev, siab elastic xeev thiab viscous flow xeev.Txhawm rau hloov mus rau cov kev xav tau ntawm cov xeev sib txawv thiab raws li kev hloov pauv ntawm cov khoom siv, cov ntsia hlau tuaj yeem muab faib ua peb ntu: ntu pub, ntu ntu ntu thiab homogenize seem.Kev ua haujlwm ntawm ntu pub mis yog pub cov khoom siv los ntawm lub hopper mus rau ntu compression.Thaum lub sij hawm txav ntawm cov yas, nws feem ntau tseem nyob hauv lub xeev thiab ib nrab melts vim cua sov.Qhov ntev ntawm ntu pub mis nws txawv nrog hom yas.Compression seem (hloov seem) yog lub luag haujlwm ntawm lub cev cov khoom siv siab, kom cov khoom los ntawm cov khoom mus rau hauv molten, zoo tawm ntawm huab cua hauv cov khoom;Txhawm rau hloov mus rau cov yam ntxwv ntawm kev txo qhov ntim thaum thawb cov roj hauv cov khoom rov qab mus rau qhov chaw pub mis, nias cov khoom thiab melting cov khoom, cov ntsia hlau nyob rau hauv seem no yuav tsum tsim cov nyhuv shearing ntau dua thiab compression ntawm cov yas.Lub luag haujlwm ntawm homogenizing seem (metering seem) yog pub cov khoom molten rau lub tshuab taub hau ntawm qhov ntim tas li (ntim) thiab siab kom nws tsim nyob rau hauv lub qhov ncauj pwm.Qhov ntim ntawm kauv zawj hauv seem homogenizing yog tib yam li hauv seem pub.
Txhawm rau kom tsis txhob muaj cov khoom khaws cia hauv qhov kawg ntawm lub taub hau ntawm lub taub hau tuag, ua rau decomposition, ntsia hlau taub hau feem ntau tsim rau hauv lub khob hliav qab lossis lub voj voog;Qee qhov ntsia hlau homogenization yog - qhov saum npoo yog lub cev du tag nrho hu ua torpedo taub hau, tab sis kuj tseem muaj cov grooves engraved los yog milling qauv.Lub taub hau torpedo muaj kev ua haujlwm ntawm nplawm thiab tswj cov khoom siv, tshem tawm qhov tshwm sim ntawm pulsating (pulsating) phenomenon nyob rau hauv qhov ntws, txo cov thickness ntawm cov khoom txheej nrog nce lub siab ntawm cov khoom, txhim kho cov cua sov, thiab ntxiv kev txhim kho cov ntsia hlau plasticizing efficiency. .Raws li cov kev xav tau yaj, yaj ntws hauv cov ntsia hlau homogenization nyob rau hauv plaub daim ntawv, thiab cov ndlwg ntawm molten cov ntaub ntawv nyob rau hauv cov ntsia hlau zawj yog ib tug ua ke ntawm cov plaub ntws: zoo txaus - yas yaj ntws ntawm lub tog raj kheej thiab cov ntsia hlau nyob rau hauv cov kev taw qhia. ntawm cov ntsia hlau zawj mus rau lub taub hau tshuab.Counter-tam sim no ntws kev taw qhia yog rov qab mus rau qhov zoo txaus, uas yog tshwm sim los ntawm lub siab gradient tshwm sim los ntawm qhov tsis kam ntawm lub qhov ntswg, ntxeem tau phaj thiab lim phaj.Qhov ntws ntawm cov yaj nyob rau hauv ib qho kev taw qhia perpendicular mus rau lub xov phab ntsa cuam tshuam rau kev sib tov thiab tshav kub pauv ntawm cov yaj thaum extrusion.Leakage flow - lub backflow tsim los ntawm lub siab gradient ntawm cov ntsia hlau thiab lub tog raj kheej, raws li axial kev taw qhia ntawm cov ntsia hlau.Cov qauv sib txawv muaj qhov cuam tshuam tseem ceeb rau kev sib xyaw ua ke ntawm cov polymers.
Screw txoj kab uas hla thiab kev txiav txim siab ntawm cov qauv qauv, feem ntau raws li cov khoom tsim tawm, specifications, hom kev ua cov ntaub ntawv thiab ntau yam structural ntsia hlau yam ntxwv los txiav txim.Feem ntau, qhov chaw pub mis ntawm cov ntsia hlau muaj qhov sib sib zog nqus zawj thiab qhov zawj qhov tob tsis hloov pauv, ntu ntu ntu (melt seem) ntawm cov ntsia hlau zawj qhov tob raws li cov kev taw qhia ntawm kev tso tawm los ntawm qhov tob mus rau qhov ntiav, metering seem (homogenized seem) ntawm cov ntsia hlau. muaj ib tug ntiav groove thiab qhov groove qhov tob tsis hloov.
- 2.Cov khoom siv ntsia hlau.
Ntsia hlau yog qhov tseem ceeb ntawm extruder, raws li cov khoom siv ntawm cov ntsia hlau yuav tsum muaj qhov kub thiab txias tsis kam, hnav tsis kam, corrosion kuj, siab zog thiab lwm yam ntxwv, tib lub sijhawm yuav tsum muaj kev ua haujlwm zoo, kev kho cua sov seem, me me thermal deformation thiab lwm yam ntxwv.Rau cov khoom siv extruder ntsia hlau, muaj cov kev cai tshwj xeeb raws li hauv qab no:
- (1) High mechanical zog.Yuav kom muaj lub zog txaus, hloov mus rau qhov kub thiab txias, kev kub siab ua haujlwm, txhim kho lub neej kev pab cuam ntawm cov ntsia hlau.
- (2) Kev ua haujlwm zoo machining.Kev ua haujlwm zoo machining thiab kev kho cua sov ua haujlwm.
- (3) Zoo corrosion thiab hnav tsis kam.
- (4) Yooj yim rau kos.
Post lub sij hawm: Jul-15-2019