Ptfe ndi imodzi mwa mitundu ya pulasitiki fluorine, ntchito processing ndi kutchinjiriza wosanjikiza, chifukwa cha ptfe mu kusungunuka mfundo 327 ℃, ndi apamwamba kuposa kusungunuka mfundo 360 ℃ ntchito disposable Kankhani extrusion sintering akamaumba njira, ndondomeko ndi zovuta kwambiri, ndondomeko. kulamulira khalidwe kumaphatikizapo zinthu zambiri, kamodzi kulamulira si zabwino, akhoza kupanga ndondomeko extrusion kapena kuoneka mitundu yonse ya vuto khalidwe;Pamene extrusion ndi sintering si bwino, izo zidzachititsa zinthu mbali kapena zidutswa zonse, ptfe mtengo ndi okwera mtengo, kotero izo zachititsa zinyalala lalikulu.
Ptfe ndi imodzi mwa mitundu ya pulasitiki fluorine, ntchito processing ndi kutchinjiriza wosanjikiza, chifukwa cha ptfe mu kusungunuka mfundo 327 ℃, ndi apamwamba kuposa kusungunuka mfundo 360 ℃ ntchito disposable Kankhani extrusion sintering akamaumba njira, ndondomeko ndi zovuta kwambiri, ndondomeko. kulamulira khalidwe kumaphatikizapo zinthu zambiri, kamodzi kulamulira si zabwino, akhoza kupanga ndondomeko extrusion kapena kuoneka mitundu yonse ya vuto khalidwe;Pamene extrusion ndi sintering si bwino, izo zidzachititsa zinthu mbali kapena zidutswa zonse, ptfe mtengo ndi okwera mtengo, kotero izo zachititsa zinyalala lalikulu.Choncho, m'pofunika kulamulira ndondomeko extrusion wa ptfe momveka, comprehensively ndi mogwira mtima, amene ali zofunika chikhalidwe kuonetsetsa mankhwala khalidwe ndi kuchepetsa zinyalala.
Kutengera ntchito ndi processing mchitidwe wa zinthu ptfe mu mawaya magetsi ndi zingwe ndi zinachitikira zothandiza, pepala akupereka mwachidule ndondomeko ptfe kutchinjiriza extrusion, kuyembekezera kuthandiza amisiri kupanga kupanga kusankha zolondola ndi kulamulira mu ndondomeko ptfe extrusion.
Njira yaukadaulo:
1. Sieve F4 ufa
Ptfe ufa ndi particles ufa pambuyo polymerization, zofewa, mphamvu ndi laling'ono kwambiri, pamene ma CD chidebe kusungidwa mosavuta ndi kulemera kapena chipwirikiti kugwedera podutsa mu tsango, moti zinkamveka m'njira zosiyanasiyana, kotero pamaso kusanganikirana ayenera kutengera specifications mauna chophimba kuti sieve. wa ptfe ufa, sefa zinthu zazikulu zophikira zowuma za mfundo, zomwe zimawonekera pazenera la 8 ndi 12 mesh ndizofunikira.Ngati agglomeration ndi yaikulu, ufa ayenera kuikidwa m`munsi kutentha, patapita nthawi, ngati agglomeration limasonyeza tithe kumvetsa tithe kumvetsa kumasulira, ndiye kuwunika.Ufa uyenera kusungidwa pamalo otsika kutentha, ndipo uyenera kugwiridwa mofatsa mukamayendetsa, kuti tipewe kuphatikizika kwakukulu kwa ptfe ufa ndipo sungagwiritsidwe ntchito.Kuonjezera apo, ukhondo wa chilengedwe uyenera kutsimikiziridwa ndipo zonyansa kapena fumbi siziyenera kusakanikirana ndi ufa wa ptfe.Chifukwa champhamvu electrostatic adsorption wa ptfe ufa, n'zosavuta adsorb mpweya kapena zosafunika yaing'ono ndi fumbi mozungulira, kotero kuti chilengedwe ukhondo popanda fumbi, ma CD chidebe pamwamba ayenera kukhala woyera pamaso kutsegula chivundikirocho.
2. Tona kapena zamkati mankhwala
Pamene kutchinjiriza kumafuna utoto kuti uzindikirike, gawo lina la tona kapena slurry liyenera kuwonjezeredwa ku ptfe ufa.Tona ndi pambuyo chabwino akupera kutentha kugonjetsedwa organic kapena inorganic pigment ufa, zosavuta kuyamwa chinyezi, agglomeration, kotero pasadakhale ayenera usavutike mtima mankhwala, kuchotsa chinyezi, ndi chophimba, zosefera kunja ikuluikulu particles.Nthawi zambiri, mawonekedwe a 180 ndi 200 mesh screen ndi oyenera.Ngati chinsalu chotchinga ndi chaching'ono kuposa ma mesh 180, ndiye kuti tinthu tating'ono ta pigment tikasefa timakhala tokulirapo, zomwe sizigwirizana ndi magwiridwe antchito a insulation.Ma mesh a skrini ndi opitilira mauna 200.Ngakhale kuti insulation layer imatsimikizika, ndizovuta kusefa.Phala lamtundu ndi chisakanizo cha tona ndi mafuta amadzimadzi, tona mumkhalidwe woyimitsidwa wamafuta, koma osasunthika kwa nthawi yayitali, kotero musanagwiritse ntchito uyenera kugwedezeka ndikusakanikirana, kuti tinthu tating'onoting'ono tona tiyimitsidwe mofanana mumadzi amafuta kuti agwiritsidwe ntchito. .
3. Zosakaniza
Batching ndi yofunika kukonzekera pamaso kusakaniza, malinga ndi chiŵerengero cha polytetrafluoroethylene ufa ndi thandizo extrusion, kapena mtundu ufa kapena mtundu phala okonzeka, pambuyo osakaniza.
Pali mitundu yambiri yaextruder, monga yan 20 ndege mafuta, toluene, mafuta efa, kapena kosakhazikika zosungunulira mafuta, zosungunulira organic, etc., osiyana extruder volatilization liwiro ndi osiyana, malinga ndi mmene zida, extrusion liwiro kusankha extruder yoyenera.Wothandizira extrusion volatilizes mofulumira kwambiri, ngakhale akhoza kufupikitsa nthawi kuyanika ndi kusintha liwiro extrusion, pamafunika okhwima ntchito nthawi yokonzekera pamaso extrusion, ndi kukonzekera ntchito nthawi sayenera kukhala yaitali kwambiri, apo ayi extrusion wothandizira wa opanda kanthu adzakhala. kukhala osagwira ntchito chifukwa cha kuphulika kwakukulu .Extruder imachedwa kwambiri kuti isasunthike, ndipo ngakhale pangakhale nthawi yokwanira yokonzekera, nthawi yowumitsa iyenera kuwonjezereka kapena zofunikira zapamwamba pa mphamvu ya zida zimafunika.Gawo la extruder liyenera kukhala 18% ndi 23%, ndipo liyenera kusinthidwa malinga ndi zomwe kondakitala amafunikira, makulidwe a wosanjikiza,extrusionliwiro ndi kuthamanga kwa extrusion.Nthawi zambiri, mafotokozedwe a waya ndi okulirapo, makulidwe a kutchinjiriza ndi okhuthala, kuthamanga kwa extrusion kumathamanga, kukanikizana kumakhala kocheperako, gawo la extruder likhoza kukhala laling'ono moyenera;M'malo mwake, mafotokozedwe a waya ndi ang'onoang'ono, makulidwe a kutchinjiriza ndi ocheperako, kuthamanga kwa extrusion kumakhala pang'onopang'ono, kukanikiza kumakhala kokulirapo, gawo la extruder likhoza kukhala lalikulu moyenerera.
Ma toner ndi otsika mtengo ndipo amagwiritsidwabe ntchito masiku ano.Kugwiritsa ntchito inki kuti utoto, PTFE kutchinjiriza kupezeka mu tona monga phala, tona ndi ptfe ufa ndi youma kusanganikirana, ndi tona zina ndi pang'ono, zosavuta kuyambitsa kusakaniza masango, kubalalitsidwa ndi osauka, si kophweka kusakaniza, zidzachititsa kwambiri kukhalapo chromatism. mbali yosiyana ya kutchinjiriza, kotero kukula kwake kochepa momwe kungathekere posankha zofunikira za tona, mtundu wa tona wotumizidwa kunja ndi wabwinoko.Mu kusanganikirana tona, ayenera kusankha pigment ufa kutentha kulolerana pamwamba 400 ℃, apo ayi pambuyo mkulu kutentha sintering (sintering kutentha zambiri zofunika 350, 400 ℃) zikhoza kuoneka mankhwala kuzimiririka chodabwitsa.Nthawi zambiri, ma inorganic pigment amatha kukana kutentha kwambiri, pomwe ma organic pigment amakhala ndi kukana kutentha kwambiri.Chifukwa chake, kugwiritsa ntchito inorganic pigments ngati tona ndikodalirika, koma chitetezo chake cha chilengedwe ndichosauka.Chiyerekezo chofananira cha tona nthawi zambiri sichiposa] %, pakupangira kwenikweni kumatha kukhala molingana ndi mtundu wa tona, mtundu wa tona, zofunikira zamtundu, makulidwe osanjikiza, etc.
Ngakhale mtengo wa phala lamtundu ndi wokwera kwambiri, umakhala wothandiza kuti ukhale wosakanikirana ndipo ndi chisankho choyenera, chomwe chingatsimikizire bwino khalidwe la mankhwala, ntchito yosavuta, yogwira ntchito kwambiri komanso yowonongeka pang'ono.Mukasakaniza phala lamtundu, phala lamtundu likhoza kuwonjezeredwa ku chithandizo cha extrusion ndi premixed mofanana.Chifukwa cha kuchuluka kwakukulu kwa extruder, kumakhala konyowa kusakaniza ndi ufa wa ptfe, kotero palibe vuto la toner agglomeration, ndipo kubalalitsidwa ndikwabwino kwambiri, ndikosavuta kusakaniza mofanana.Gawo la phala lamtundu nthawi zambiri limakhala pakati pa 0.3% ndi 0.5 ‰, ndi 3 ‰ kukhala ambiri.Ochepa okha milandu yapadera amafuna gawo la 0,5 ‰.Pamene kutchinjiriza wosanjikiza m'mphepete makulidwe wosanjikiza ndi woonda, chiwerengero cha mtundu phala ayenera moyenerera chinawonjezeka ndi 0,1%, 0,2.
4. Kusakaniza
Kusakaniza ndi kusakaniza polytetrafluoroethylene ufa ndi thandizo extrusion, kapena mtundu ufa kapena mtundu phala wogawana, kuonetsetsa kuti extrusion kutchinjiriza kondomu ndi mtundu kufanana.Kuti muthandizire kusanganikirana kwa yunifolomu, kuchuluka kwa botolo losanganikirana (botolo lapakamwa lalikulu) ndiloyenera 4, 5 malita, kutsitsa kwabwino kumakhala pafupifupi 800, 1000 g, voliyumu yotsitsa imakhala pafupifupi 2/3 ya botolo losakaniza. voliyumu ndi yabwino, kotero pali malo okwanira osakaniza.
Kusakaniza kwamtundu wachilengedwe (makamaka komwe kumagwiritsidwa ntchito kutulutsa chingwe cha ma radio frequency) sikufunikira kuwonjezera tona.Mukasakaniza, ikani ufa wa ptfe mu botolo losakaniza.Amagwiritsidwa ntchito kuti anthu ayesetse kuti asagwirizane ndi kusakaniza botolo la khoma la botolo, mwa munthu kufinya chithandizo chomwe chilipo chida choyera chidzakhala kusakaniza bwino mu botolo pamwamba pa ptfe ufa ku khoma la botolo, kupanga pamwamba pake kuti apange kuya pafupifupi 2, 3 c wa dzenje conical, ndiye anthu mwachindunji ntchito mu gawo lina mu dzenje taper;Pambuyo pake, botolo losakaniza liyenera kutsekedwa ndi kutsekedwa mwamphamvu kuti chiwombankhanga chisawonongeke.Choyamba, botolo losakaniza lidzagwedezeka ndikusakaniza pamanja kwa mphindi zosachepera 5, kenako botolo losakaniza lidzayikidwa pamakina osakaniza kuti ligwedezeke ndikugudubuza kwa mphindi 30 mpaka kusakaniza kukhale kofanana.
5. Chokwanira
Zotsatira za kukanikiza (zinthu) billet ndi kukanikiza lotayirira porous polytetrafluoroethylene ufa mu ndi yaying'ono zinthu billet, kuchotsa pores ndi mpweya zili mmenemo kuti extruding ntchito.Nthawi zambiri ayenera kukhala mu chilengedwe cha 20 ℃ pamwamba akusoweka kukanikiza, adzakhala homogenized ufa pang`onopang`ono kutsanulira mu kuthamanga yamphamvu yamphamvu, pa nthawi yomweyo ayenera kuonetsetsa kuti mtima ndodo ndi kuthamanga yamphamvu yamphamvu concentric, ndi modekha kugwedeza yamphamvu kuthamanga mu zinthu pamwamba, ndiyeno kuwonjezera mavuto chivundikirocho pa izo.Kupanikizika kuyenera kukhala koyenera, mochuluka kapena pang'ono kwambiri kudzakhudza khalidwe la extrusion.Ngati kupanikizika kwa chopanda kanthu kuli kwakukulu kwambiri, extruder ndi yosavuta kupanikizika, ndipo ntchito ya mafuta pa nthawi ya extrusion imachepetsedwa, kupanikizika kwa extrusion kumawonjezeka, ndipo kumeta ubweya wa zinthu kumakhala kwakukulu, zomwe zimayambitsa fibrosis yambiri, osathandiza kukhazikika kwa m'mimba mwake kunja kwa kutchinjiriza kwa extrusion, ndipo kuchuluka kwa shrinkage ya insulation sintering ndikokulirapo, komwe kumakhala kosavuta kuyambitsa kuphulika.
6. Finyani
Ntchito yokonzekera ptfe kutchinjiriza extrusion makamaka zikuphatikizapo kusankha psinjika chiŵerengero, preheating ndi Kutentha kwa extrusion yamphamvu ndi kufa, kusintha kwa kusiyana singano pakati malaya kufa ndi pachimake kufa, kulipiritsa akusowekapo, kondakitala anayendera, kuboola kondakitala, kusintha kukangana ulusi, osakaniza kusindikiza mutu wa makina ndi silinda ya extrusion, etc., yomwe idzayambitsidwe ndi zotsatirazi.
The psinjika chiŵerengero cha mitundu yosiyanasiyana ya ptfe ufa pa extrusion ndi osiyana.yoyenera psinjika chiŵerengero ayenera kutsimikiziridwa malinga ndi katundu ptfe ufa kuonetsetsa ndondomeko ntchito ndi khalidwe pa extrusion.Extrusion compression ratio imatanthauza chiŵerengero chapakati pa gawo la annular la kufa kwa extrusion ndi gawo la annular la chopanda kanthu.Nthawi zambiri, masilindala a extruder amagawidwa m'magulu atatu: ang'onoang'ono, apakati ndi akulu.M'mimba mwake ya silinda yaying'ono ndi pafupifupi 38 mm, silinda yapakatikati ndi pafupifupi 50 mm, ndipo silinda yayikulu imakhala pafupifupi 65 mm. Pakupanga kwenikweni, zofunikira za silinda ya extruder ziyenera kusankhidwa molingana ndi gawo la gawo la gawo la kusungunula kwa extruder.
Kuti mukhalebe kutentha kosasunthika kwa zopanda kanthu ndikuthandizira kuphulika kwa extruder pambuyo pa extrusion, cylinder extrusion ndi nkhungu ziyenera kutenthedwa bwino.Kutentha kwa preheating kwa silinda ya extrusion kuyenera kukhala 30 kapena 40 ℃, ndipo kutentha kwa nkhungu kuyenera kukhala 50 kapena 60 ℃.
The extrusion ayenera kukhala molingana ndi mfundo za lolingana nkhungu yofananira ndi malinga ndi malo a msonkhano, ndi nkhungu manja onyamula mzere khosi chiwerengero cha anthu ndi singano chubu pakati pa mtunda (kusiyana) kwa malo oyenera.Chilolezo chachikulu kwambiri kapena chaching'ono kwambiri chidzakhudza mtundu wa wosanjikiza wotsekera.Ngati kusiyana kuli kochepa kwambiri, kuthamanga kwa kutuluka kwa zinthu za ptfe kupita kunja kwa nkhungu kumathamanga, ndipo zinthuzo zidzadulidwa mopitirira muyeso, zomwe zimapangitsa kuti fibrosis iwonongeke, zomwe zimapangitsa kuchepa kwa mphamvu yopingasa ya wosanjikiza wa insulation. mankhwala sachedwa longitudinal akulimbana kapena ming'alu yamkati ya kutchinjiriza, ndi kutchinjiriza ndi kondakitala ❖ kuyanika si zolimba (pali "lotayirira chivundikiro"). Kusiyana ndi lalikulu kwambiri, adzapanga ptfe zinthu kunja kwa nkhungu extrusion liwiro kuchepetsa , zinthu kuthamanga kondakitala ukuwonjezeka, nthawi zambiri zimachitika extrusion Kusakhazikika kapena chifukwa kondakitala psinjika anagubuduza ndi kutulutsa "pine" vuto, ndi kondakitala sangathe kudutsa chodabwitsa singano pulagi.
Nthawi yotumiza: Jan-01-2018