Sebaka se qhibilihang sa kristale sa PTFE ke 327℃, empa resin e tlameha ho ba ka holimo ho 380℃ hore e be boemong ba ho qhibiliha.Ho feta moo, PTFE e na le khanyetso e matla haholo ea solvent.Ka hona, e ke ke ea sebelisa ts'ebetso ea ho qhibiliha kapa ea ho qhibiliha.Ka kakaretso, tlhahiso ea lihlahisoa tsa eona e ka etsoa feela joaloka ts'ebetso ea tšepe le ea ceramic.Phofo e qala ho kopanngoa, ebe e silafatsoa le ho etsoa ka mechine, kapa e thehoa ka extrusion, Isobaric forming, coating forming, and calendering forming.
Sebaka se qhibilihang sa kristale sa PTFE ke 327℃, empa resin e tlameha ho ba ka holimo ho 380℃ hore e be boemong ba ho qhibiliha.Ho feta moo, PTFE e na le khanyetso e matla haholo ea solvent.Ka hona, e ke ke ea sebelisa ts'ebetso ea ho qhibiliha kapa ea ho qhibiliha.Ka kakaretso, tlhahiso ea lihlahisoa tsa eona e ka etsoa feela joaloka ts'ebetso ea tšepe le ea ceramic.Phofo e qala ho kopanngoa, ebe e silafatsoa le ho etsoa ka mechine, kapa e thehoa ka extrusion, Isobaric forming, coating forming, and calendering forming.
Compression Molding
Compress molding ke eona e kholo ka ho fetisisaPTFE molding processingmokhoa o sebelisoang hajoale bakeng sa PTFE.Mokhoa oa ho bōpa ke mokhoa oo lisebelisoa tse itseng tsa ho bōpa (phofo, li-pellets, lisebelisoa tsa fibrous, joalo-joalo) li kenngoa ka har'a hlobo ea tšepe 'me li bōptjoa ka mocheso o itseng le khatello.Polymer e sebetsitsoeng ka ho bopeha ha compression ha e felle feela ka boima ba eona ba molek'hule, mme hoo e ka bang lipolasetiki tsohle li ka sebetsoa ka ho bopa ha compression.Litšobotsi tse ka sehloohong tsa ho bopa ha compression ke: theko e tlaase, lisebelisoa tse bonolo, lichelete tse tlaase, 'me ha li felle ka boima ba limolek'hule tsa polasetiki e entsoeng;mefokolo ke katleho e tlase ea tlhahiso, matla a phahameng a basebetsi, le boleng bo sa tsitsang ba sehlahisoa.Boima ba molek'hule ea PTFE bo phahame haholo 'me metsi a fokola haholo.Ha mekhoa e meng ea ts'ebetso e sa phethahala, linaha lefats'eng ka bophara li sebelisa compression molding ho sebetsana le lihlahisoa tsa PTFE.
Mokhoa o ikhethileng oa ho bopa ha compression o arotsoe ka ① mokhoa oa khatiso-sinter-press;② mokhoa oa sinter-press;③ mokhoa oa ho futhumatsa ka potlako;④ tobetsa 'me u sinter ka nako e le' ngoe.
Hydroforming
Mokhoa oa hydraulic o boetse o bitsoa mokhoa oa ho lekana le mokhoa o lekanang oa khatello, e leng ho eketsa PTFE resin ka ho lekana pakeng tsa mokotla oa rabara le lebota la hlobo, ebe o kenya mokelikeli (metsi a sebelisoang hangata) ka mokotleng oa rabara, le mokotla oa rabara o hlahisang. khatello e atoloha leboteng hlobo le compacts Resin fetoha mokhoa oa preforms.Mokhoa ona o ka sebelisoa ho etsa li-sleeve tse kholoanyane, litanka tsa polokelo tse tlase, likhetla tsa hemispherical, litšiea tsa tora, li-slabs tse kholo, joalo-joalo, 'me e ka sebelisoa ho etsa li-tee, litsoele, lisebelisoa tsa profil, joalo-joalo tse nang le sebopeho se kopaneng sa PTFE.Lihlahisoa tse nang le libopeho tse rarahaneng.Monyetla o ka sehloohong oa hydroforming ke sebopeho se bonolo sa lisebelisoa le hlobo.Pompo e tloaelehileng ea metsi e nkela mochine oa khatiso oa lithane tse phahameng.Sehlahisoa se hatelloa ka mokhoa o ts'oanang, se na le sekhahla se tsitsitseng, se ka etsa likarolo tse kholo, se na le libopeho tse rarahaneng, le mekhoa e bonolo ea lesela.
Ho theha ho sututsa
Ho sututsa ho boetse ho bitsoapeista extrusionho bopa.The 20-30 mesh sieved disspersing resin e kopantsoe le li-additives (toluene, petroleum ether, solvent oli, joalo-joalo, karolo ea boima ba resin ke 1/5) ho etsa pente.E petelitsoe esale pele ka har'a sekoti se pota-potiloeng se teteaneng, ebe u se kenya ka har'a lisebelisoa tsa khatiso, 'me u sebelise plunger ho e etsa tlas'a mocheso.Ka mor'a ho omisa, e chesoa ka mocheso oa 360 ~ 380C, 'me ka mor'a ho pholile, ho fumanoa tube e thata, molamu le lihlahisoa tse ling.Lihlahisoa tsa ho sututsa li lekanyelitsoe ho lithupa tse bophara ba 16mm kapa ka tlase le liphaephe tse nang le botenya ba 3mm kapa ka tlase.
Ho bopa ha spiral extrusion
The screw extruder ea PTFE phofo e fapane le extruder e sebelisetsoang thermoplastics tse ling.Sebopeho sa extrusion sa Zengtong thermoplastics ke ho ntšetsa pele lisebelisoa ka ho potoloha ha screw, ha o ntse o bapala karolo ea khatello, ho kuta le ho kopanya., Thepa e boetse e qhibilihisoa ke mocheso o hlahisoang ke matla a maholo le ho futhumatsa ka ntle ho thepa.The screw of the PTFE screw extruder e phetha karolo feela ea ho tsamaisa le ho sutumetsa, e le hore thepa e fetele hloohong ea "screw extruder" e nang le likhoele tse peli, sekontiri se lekanang le botebo bo lekanang, ebe e kena ka sekoting sa sintering, Cooling. le ho bopa ka khatello e fanoang ke sesebelisoa sa backpressure ho fihlela sepheo se tsoelang pele.Ha o sebetsana le PTFE ka screw extruder e le 'ngoe, hangata ho kopana le mathata a maholo.Hobane coefficient ea likhohlano tsa PTFE phofo e tlaase haholo, e baka ho thella nakong ea mokhoa oa ho fepa, e leng ho fokotsang haholo matla a ho fetisa a screw.Ho phaella moo, ka lebaka la khohlano le ho hlahisa mocheso, phofo e ka 'na ea khomarela screw kapa barrel, ho etsa hore ho fepa ho be thata le ho se tsitse.
Lilemong tsa morao tjena, li-screws tse peli li 'nile tsa sebelisoa ha ho etsoa thepa ea mofuta ona o khethehileng.Mokhoa oa eona oa ho fepa o fapane le oa li-extruder tsa single-screw.E na le phello e ntle ea ho fetisa 'me e ka hlōla ho thella ha phofo ea UHMWPE ka har'a screw.Ntlafatsa haholo matla a ho fepa ka screw.Har'a bona, counter-rotating twin-screw extruder e na le liphello tse molemo tsa ho kopanya le homogenization ho feta li-fahla-screw extruder tse tšoanang tse potolohang, empa ka lebaka la matla a eona a maholo a karohano, phello ea ho kuta ka lekhalo la screw e kholoanyane, e etsa hore thepa e futhumale. le extrude.Boima ba limolek'hule tsa thepa e hlahisoang bo ka fokotsoa ka hoo e ka bang 40%.Haeba lebala le etsoa le leholo mme li-screws li sa kopane, thepa e tla khomarela tšepe e chesang haholo.Leha ho le joalo, ts'ebeliso ea li-extruder tsa twin-screw tse potolohang ha li na mathata a kaholimo.Phello ea ho kuta ea thepa ea extruder e batla e le nyenyane, 'me mocheso o hlokahalang bakeng sa polasetiki o tsoa mohloling oa ho futhumatsa ka ntle, kahoo o ka laoloa ka nepo e le hore ho senyeha ho feteletseng ha thepa nakong ea ts'ebetso ea extrusion ho ka fokotsoa, ka nako e ts'oanang ho boloka Phallo ea lisebelisoa hloohong ea mochine e tloaelehile ebile e tsitsitse, 'me moralo oa boholo ba karolo ea hlooho ea mochine o lokela ho ikamahanya le molumo oa thepa e fetisitsoeng ke screw.Lebelo la ho potoloha ha screw le lona le ka se be lebelo, hangata ho pota 10 revolutions ka motsotso.E le ho qoba boitsebiso boo ka tšohanyetso bo khomarelang holim'a tšepe, mocheso oa extrusion o tlameha ho laoloa ka thata.
Plunger extrusion molding
Plunger extrusion molding processing plastics ke mokhoa oa khale oa ho sebetsa ka polasetiki.Ho tloha ha ho hlaha lisebelisoa tsa polasetiki, batho ba se ba qalile ho sebelisa mokhoa ona ho sebetsana le polasetiki.Ho sebetsana le PTFE ka plunger extruder, resin e ngata e hatelloa ka har'a hlobo, plunger e khutlisetsoa morao, 'me e hatelloa hore e be preform.Ka tsela ena, li-preforms tse ngata li thehoa ka lefung.Ka lebaka la likhohlano pakeng tsa resin ea PTFE le khohlano lipakeng tsa PTFE resin le lerako la die, khanyetso e hlahisoa.Ka nako e ts'oanang, katoloso ea molumo oa preform ha sintered ka lefu e boetse e hlahisa khanyetso, e le hore e be preform ea karolo e le 'ngoe.Ho sintering le ho pholisa tlas'a khatello ho etsa ntho e tsoelang pele.Melemo ea mokhoa ona ke: ha ho na ho kuta nakong ea ho bōptjoa, boima ba molek'hule bo fokotsehile, boleng ba sehlahisoa bo botle, 'me ha bo felle ka boima ba molek'hule,' me bo ka sebetsana le li-diameter tse kholo ka bophara bo boholo ba 500mm le botenya ba lebota ba 3mm feela.Pipe.Leha ho le joalo, ka lebaka la sebaka se senyenyane sa ho kopana pakeng tsa thepa e tala le karolo ea ho futhumatsa nakong ea ho romela, ho sebetsa hantle ha mocheso ho tlaase, e leng ho fokotsa lebelo la extrusion ea eona.
Nako ea poso: Jun-14-2020