Ptfe yog ib yam ntawm cov fluorine yas, siv rau kev ua thiab rwb thaiv tsev txheej, vim ptfe nyob rau hauv melting point 327 ℃, thiab siab tshaj lub melting point 360 ℃ siv pov tseg thawb extrusion sintering molding txoj kev, txheej txheem yog complex, txheej txheem Kev tswj xyuas zoo muaj ntau yam, thaum tswj tsis tau zoo, tuaj yeem ua rau cov txheej txheem extrusion los yog tshwm sim txhua yam teeb meem zoo;Thaum extrusion thiab sintering tsis ua tiav, nws yuav ua rau cov khoom siv los yog tag nrho cov seem, ptfe tus nqi yog kim, yog li nws tau ua rau cov khib nyiab loj.
Ptfe yog ib yam ntawm cov fluorine yas, siv rau kev ua thiab rwb thaiv tsev txheej, vim ptfe nyob rau hauv melting point 327 ℃, thiab siab tshaj lub melting point 360 ℃ siv pov tseg thawb extrusion sintering molding txoj kev, txheej txheem yog complex, txheej txheem Kev tswj xyuas zoo muaj ntau yam, thaum tswj tsis tau zoo, tuaj yeem ua rau cov txheej txheem extrusion los yog tshwm sim txhua yam teeb meem zoo;Thaum extrusion thiab sintering tsis ua tiav, nws yuav ua rau cov khoom siv los yog tag nrho cov seem, ptfe tus nqi yog kim, yog li nws tau ua rau cov khib nyiab loj.Yog li ntawd, nws yog ib qho tsim nyog los tswj cov txheej txheem extrusion ntawm ptfe kom tsim nyog, ua tiav thiab ua tau zoo, uas yog qhov tsim nyog los xyuas kom meej cov khoom zoo thiab txo cov khoom pov tseg.
Raws li daim ntawv thov thiab kev coj ua ntawm cov khoom siv ptfe hauv cov xov hluav taws xob thiab cov cables thiab cov kev paub dhau los, daim ntawv muab cov ntsiab lus luv luv ntawm cov txheej txheem ptfe rwb thaiv tsev extrusion, vam tias yuav pab cov kws tshaj lij tsim khoom kom raug xaiv thiab tswj hauv ptfe extrusion txheej txheem.
Technology txheej txheem:
1. Sieve F4 hmoov
Ptfe hmoov yog cov hmoov nplej tom qab polymerization, mos, lub zog me me, thaum nyob rau hauv ntim ntim tau yooj yim los ntawm qhov hnyav los yog turbulence vibration hauv kev thauj mus los hauv pawg, sib tov qhov tshwm sim tsis sib xws, yog li ua ntej sib tov yuav tsum tau txais qee qhov tshwj xeeb ntawm lub vijtsam mesh rau sieve. ntawm ptfe hmoov, lim tawm cov pob txha loj dua ua cov hmoov txhuv nplej siab, cov lus qhia tshwj xeeb ntawm lub npov mesh hauv 8 thiab 12 mesh yog pom zoo.Yog hais tias lub agglomeration loj heev, cov hmoov yuav tsum tau muab tso rau hauv ib tug qis kub, tom qab ib tug lub sij hawm ntawm lub sij hawm, yog hais tias lub agglomeration qhia tau hais tias ntawm loosening, ces tshuaj ntsuam.Cov hmoov yuav tsum tau muab khaws cia rau hauv qhov chaw uas tsis muaj qhov kub thiab txias, thiab yuav tsum tau ua tib zoo saib xyuas hauv cov txheej txheem ntawm kev tuav, kom tsis txhob muaj kev sib txuam ntawm ptfe hmoov thiab nws tsis tuaj yeem siv.Tsis tas li ntawd, ib puag ncig kev nyiam huv yuav tsum tau ua kom ntseeg tau thiab impurities lossis hmoov av yuav tsum tsis txhob muab sib xyaw rau hauv ptfe hmoov.Vim muaj zog electrostatic adsorption ntawm ptfe hmoov, nws yog ib qho yooj yim rau adsorb huab cua los yog me me impurities thiab hmoov av nyob ib ncig ntawm, yog li ua kom ib puag ncig huv si tsis muaj hmoov av, lub ntim ntim nto yuav tsum huv si ua ntej qhib lub hau.
2. Toner lossis pulp kho
Thaum rwb thaiv tsev xav tau xim rau kev txheeb xyuas, ib feem ntawm cov toner lossis slurry yuav tsum tau ntxiv rau ptfe hmoov.Toner yog tom qab zoo sib tsoo ntawm kub resistant organic los yog inorganic pigment hmoov, yooj yim rau nqus noo noo, agglomeration, yog li ua ntej yuav tsum tau rhuab kev kho mob, tshem tawm noo noo, thiab tshuaj ntsuam, lim tawm cov loj hais.Feem ntau, 180 thiab 200 mesh screen specifications yog tsim nyog.Yog tias lub vijtsam npo me dua 180 mesh, tom qab ntawd cov xim pigment tom qab lim dej loj dua, uas tsis zoo rau kev ua haujlwm ntawm cov txheej txheem rwb thaiv tsev.Qhov screen mesh yog ntau tshaj 200 mesh.Txawm hais tias lub rwb thaiv tsev kev ua tau zoo ntawm cov txheej rwb thaiv tsev yog lav, nws yog qhov nyuaj rau lim.Xim muab tshuaj txhuam yog sib tov ntawm cov toner thiab oily kua, toner nyob rau hauv oily kua ncua kev kawm ntawv lub xeev, tab sis nyob twj ywm rau ib lub sij hawm ntawm lub sij hawm yuav precipitate, yog li ua ntej siv yuav tsum tau shaken thiab tov, thiaj li hais tias cov precipitate toner hais tusyees raug tshem tawm nyob rau hauv oily kua siv. .
3. Cov khoom xyaw
Batching yog ib qho kev npaj tseem ceeb ua ntej sib tov, raws li qhov sib piv ntawm polytetrafluoroethylene hmoov thiab extrusion pab, los yog xim hmoov los yog xim paste npaj, tom qab sib tov.
Muaj ntau homextruder, xws li yan 20 aviation roj av, toluene, roj av ether, los yog lwm yam volatile solvent roj, organic solvent, thiab lwm yam, txawv extruder volatilization ceev yog txawv, raws li qhov tseeb qhov teeb meem ntawm cov khoom, extrusion ceev los xaiv tus tsim nyog extruder.Tus pab extrusion volatilizes sai heev, txawm hais tias nws tuaj yeem txo lub sijhawm ziab thiab txhim kho qhov nrawm nrawm, nws yuav tsum muaj sijhawm ua haujlwm nruj rau kev npaj ua ntej extrusion, thiab lub sijhawm npaj ua haujlwm yuav tsum tsis txhob ntev dhau, txwv tsis pub tus extrusion pab ntawm qhov khoob yuav yuav tsis muaj txiaj ntsig vim muaj kev kub ntxhov ntau dhau .Extruder qeeb dhau rau evaporate, thiab txawm hais tias tej zaum yuav muaj sij hawm npaj txaus, lub sij hawm ziab yuav tsum tau txuas ntxiv lossis siab dua rau cov cuab yeej muaj peev xwm.Qhov kev faib ua feem ntawm extruder yuav tsum yog 18% thiab 23%, thiab yuav tsum tau kho raws li cov specifications ntawm tus neeg xyuas pib, rwb thaiv tsev txheej thickness,extrusionceev thiab extrusion siab.Feem ntau, cov xov hlau tshwj xeeb yog loj dua, cov rwb thaiv tsev thickness yog thicker, extrusion ceev ceev, compression me me, qhov feem ntawm extruder yuav tsim nyog me me;Ntawm qhov tsis sib xws, cov ntsiab lus ntawm cov hlau yog me dua, cov txheej txheem rwb thaiv tsev yog thinner, extrusion ceev qeeb dua, compression loj dua, qhov kev faib ua feem ntawm extruder tuaj yeem loj dua.
Toners raug nqi tsawg dua thiab tseem siv niaj hnub no.Siv cov xim pleev xim rau xim, PTFE rwb thaiv tsev dispersion nyob rau hauv toner li muab tshuaj txhuam, toner thiab ptfe hmoov yog qhuav mixing, thiab toner additives thiab kuj me ntsis, yooj yim ua rau sib tov pawg, dispersion tsis zoo, tsis yooj yim rau sib tov, yuav ua rau muaj teeb meem loj chromatism. Qhov sib txawv ntawm cov rwb thaiv tsev, yog li nws qhov loj me me npaum li qhov ua tau thaum xaiv cov khoom siv toner, cov toner txawv teb chaws zoo dua.Hauv kev sib xyaw toner, yuav tsum xaiv cov xim hmoov kub siab tshaj 400 ℃, txwv tsis pub tom qab kub kub sintering (sintering kub feem ntau hauv 350, 400 ℃) tej zaum yuav tshwm sim cov khoom fading tshwm sim.Feem ntau, inorganic pigments muaj qhov kub thiab txias tsis kam, thaum cov pigments organic muaj qhov tsis zoo rau qhov kub thiab txias.Yog li ntawd, kev siv cov pigments inorganic li toner yog ntau txhim khu kev qha, tab sis nws ib puag ncig tiv thaiv tsis zoo.Qhov sib piv ntawm toner feem ntau tsis ntau tshaj] %, nyob rau hauv qhov tseeb ntau lawm yuav ua tau raws li hom toner, toner zoo, xim yuav tsum, rwb thaiv tsev txheej thickness, thiab lwm yam.
Txawm hais tias tus nqi ntawm cov xim muab tshuaj yog siab, nws yog qhov tsim nyog rau kev sib xyaw ua ke ntawm kev sib xyaw thiab yog qhov kev xaiv zoo tshaj plaws, uas tuaj yeem ua kom cov khoom zoo, kev ua haujlwm yooj yim, kev ua haujlwm siab thiab tsis muaj pov tseg.Thaum sib tov cov xim muab tshuaj txhuam, cov xim muab tshuaj ntxiv tuaj yeem ntxiv rau kev pabcuam extrusion thiab premixed tusyees.Vim yog qhov loj ntawm extruder, nws yog ntub nrog ptfe hmoov, yog li tsis muaj teeb meem ntawm toner agglomeration, thiab dispersion yog zoo heev, nws yog ib qho yooj yim los sib tov tusyees.Qhov feem ntau ntawm cov xim muab tshuaj yog feem ntau ntawm 0.3% thiab 0.5 ‰, nrog 3 ‰ feem ntau.Tsuas yog ob peb qhov tshwj xeeb xav tau qhov kev faib ua feem ntawm 0.5 ‰.Thaum lub rwb thaiv tsev txheej txheej txheej txheej thickness yog nyias nyias, qhov feem ntawm cov xim muab tshuaj txhuam yuav tsum tsim nyog nce 0.1%, 0.2.
4. Cov sib tov
Kev sib tov yog sib tov polytetrafluoroethylene hmoov nrog extrusion pab, los yog xim hmoov los yog xim muab tshuaj txhuam tusyees, kom ntseeg tau tias lub extrusion rwb thaiv tsev lubrication thiab xim uniformity.Txhawm rau pab txhawb kev sib xyaw ua ke, qhov ntim ntawm lub raj mis dav dav (lub qhov ncauj dav) yog tsim nyog rau 4, 5 litres, qhov chaw thau khoom zoo yog li 800, 1 000 g, qhov ntim ntim rau li 2/3 ntawm lub raj mis sib xyaw. ntim tau zoo, yog li muaj qhov chaw txaus rau kev sib tov.
Lub ntuj xim sib xyaw (tsuas yog siv los extrude lub rwb thaiv tsev ntawm xov tooj cua zaus cable) tsis tas yuav ntxiv toner.Thaum sib tov, muab ptfe hmoov rau hauv lub raj mis sib tov ua ntej.Siv los ua kom tib neeg sim tsis txhob sib cuag nrog sib tov lub raj mis ntawm lub raj mis phab ntsa, nyob rau hauv tus neeg mus nyem kev pab muaj cov ntaub ntawv huv si yuav maj mam sib tov nyob rau hauv ib lub raj mis qhov chaw ntawm lub nto ntawm ptfe hmoov rau lub raj mis phab ntsa, ua rau nws nto chaw tsim ib tug qhov tob ntawm txog 2,3 c ntawm conical qhov, ces tib neeg siv ncaj qha rau hauv ib qho kev faib ua feem nyob rau hauv lub taper qhov;Tom qab ntawd, lub raj mis sib tov yuav tsum tau capped thiab nruj nreem kaw kom tsis txhob extruder los ntawm volatilizing.Ua ntej, lub raj mis sib tov yuav tsum tau shaken thiab tov manually tsis pub tsawg tshaj 5 feeb, thiab tom qab ntawd lub raj mis sib tov yuav tsum muab tso rau ntawm lub tshuab sib tov kom viav vias thiab yob rau ntau tshaj 30 feeb kom txog thaum sib tov sib xyaw.
5. Compact
Cov nyhuv ntawm nias (khoom siv) billet yog nias xoob porous polytetrafluoroethylene hmoov rau hauv cov khoom siv sib xyaw ua ke, tshem tawm cov pores thiab huab cua uas muaj nyob hauv nws rau kev siv extruding.Feem ntau yuav tsum nyob rau hauv ib puag ncig ntawm 20 ℃ saum lub npliag nias, yuav homogenized hmoov maj mam ncuav rau hauv lub siab lub tog raj kheej lub tog raj kheej, tib lub sij hawm yuav tsum xyuas kom meej tias lub plawv pas nrig thiab siab lub tog raj kheej kheej kheej concentric, thiab maj mam co lub siab lub tog raj kheej nyob rau hauv lub cov khoom nto, thiab tom qab ntawd ntxiv lub hau npog rau nws.Lub siab yuav tsum tsim nyog, ntau dhau lossis tsawg dhau yuav cuam tshuam rau qhov zoo ntawm extrusion.Yog tias lub siab ntawm qhov khoob loj dhau lawm, lub extruder yog yooj yim rau overpressed, thiab lub lubrication kev ua tau zoo thaum lub sij hawm extrusion yog txo, lub extrusion siab yog nce, thiab shear kev nyuaj siab ntawm cov khoom yog loj, uas ua rau ntau fibrosis, uas yog. tsis conducive rau lub stability ntawm sab nraud txoj kab uas hla ntawm lub extrusion rwb thaiv tsev, thiab lub shrinkage tus nqi ntawm rwb thaiv tsev sintering yog loj, uas kuj yog ib qho yooj yim ua rau rwb thaiv tsev tawg.
6. Nyem tawm
Kev npaj ua hauj lwm rau ptfe rwb thaiv tsev extrusion feem ntau suav nrog kev xaiv ntawm compression piv, preheating thiab cua sov ntawm extrusion lub tog raj kheej thiab tuag, kev kho ntawm rab koob sib txawv ntawm lub tes tsho tuag thiab tuag tub ntxhais, them dawb, tus neeg xyuas pib soj ntsuam, tus neeg xyuas pib tho, kho cov xov nro, kev sib khi sealing. ntawm lub taub hau tshuab thiab extrusion lub tog raj kheej, thiab lwm yam., uas yuav qhia hauv qab no.
Lub compression piv ntawm ntau hom ptfe hmoov thaum extrusion kuj txawv.Qhov zoo ntawm compression ratio yuav tsum tau txiav txim raws li cov khoom ntawm ptfe hmoov los xyuas kom meej cov txheej txheem kev ua tau zoo thiab zoo thaum extrusion.Extrusion compression ratio yog hais txog qhov sib piv ntawm thaj tsam annular ntawm extrusion tuag thiab thaj tsam annular ntawm qhov khoob.Feem ntau, extruder cylinders tau muab faib ua peb qhov ntau thiab tsawg: me, nruab nrab thiab loj.Txoj kab uas hla ntawm lub tog raj kheej me me yog li 38 hli, lub tog raj kheej nruab nrab yog li 50 hli, thiab lub tog raj kheej loj yog li 65 hli.Nyob rau hauv qhov tseeb ntau lawm, cov lus qhia tshwj xeeb ntawm lub tog raj kheej extruder yuav tsum raug xaiv raws li thaj tsam ntawm cov txheej txheem extruder rwb thaiv tsev.
Txhawm rau kom tswj tau qhov kub thiab txias ntawm qhov khoob thiab pab txhawb lub volatilization ntawm extruder tom qab extrusion, lub tog raj kheej extrusion thiab pwm yuav tsum tau preheated kom zoo.Lub preheating kub ntawm lub extrusion lub tog raj kheej yuav tsum yog 30 los yog 40 ℃, thiab preheating kub ntawm pwm yuav tsum yog 50 los yog 60 ℃.
Lub extrusion yuav tsum tau ua raws li cov specifications ntawm qhov sib txuam pwm thiab raws li qhov chaw ntawm lub rooj sib txoos, thiab cov pwm lub tes tsho bearing kab caj dab cov pej xeem thiab koob raj ntawm qhov deb (kawg) mus rau qhov tsim nyog.Loj dhau los yog me me heev clearance yuav cuam tshuam qhov zoo ntawm extruded rwb thaiv tsev txheej.Yog tias qhov sib txawv me me dhau, qhov nrawm ntawm extrusion ntawm ptfe cov khoom mus rau sab nraud ntawm cov pwm yuav nrawm dua, thiab cov khoom yuav raug txiav ntau dhau, ua rau cov fibrosis ntau dhau, uas ua rau qhov txo qis ntawm lub zog transverse ntawm rwb thaiv tsev txheej, Cov khoom lag luam yog qhov ua rau cov kab nrib pleb ntev los yog cov kab nrib pleb ntawm cov rwb thaiv tsev, thiab cov rwb thaiv tsev thiab cov neeg xyuas pib txheej tsis nruj (muaj "cov ntaub npog") qhov sib txawv loj heev, yuav ua rau cov khoom siv ptfe rau sab nraud ntawm cov pwm extrusion nrawm nrawm. , cov khoom siv siab ntawm tus neeg xyuas pib nce, feem ntau tshwm sim extrusion instability los yog ua rau tus neeg xyuas pib compression dov thiab tsim "pine" teeb meem, thiab tus neeg xyuas pib tsis tuaj yeem dhau los ntawm lub koob ntsaws tshwm sim.
Post lub sij hawm: Jan-01-2018