I-PTFE iyinto ewusizo kakhulu ngoba inenhlanganisela eyingqayizivele yezakhiwo.I-PTFE ayisebenzi ngamakhemikhali, iyakwazi ukumelana nesimo sezulu, ifaka ugesi omuhle kakhulu, ukumelana nokushisa okuphezulu, i-coefficient ephansi yokungqubuzana kanye nezakhiwo ezinganamatheli.Amashubhu ashwabeneyo nawo asetshenziswa njengezembozo zamaroll nokuvikela izingxenye noma izingxenye zikagesi.I-PTFE ingaphinda idlulwe noma ikhishwe kumateyipu namafilimu angasetshenziselwa izigxivizo nezinto ze-gasket.i-polymer igama lokuhweba elijwayelekile le-polytetrafluoroethylene (PTFE) elenziwe.
Okujwayelekile kwawo wonke amamaki e-Polymer PTFE (i-polytetrafluoroethylene) izimpushana ezinhle, zingagcotshwa futhi zikhishwe ngamasu okunamathisela okunamathisela okujwayelekile.Uma kuqhathaniswa namanye amamaki e-PTFE impushana, i-polymer PTFE iyinhlaka eye yandisa amandla ancibilikayo kanye nokuncipha okuncipha.Ingenye yama-resins angaguquki futhi kulula ukuwacubungula.Ifaneleka kakhulu kumikhiqizo ene-medium-to-high reductionratio extrusions.
Imikhiqizo ecutshungulwe kahle eyenziwe nge-polymer ecocekile ye-PTFE inikeza izici eziphakeme ezijwayelekile zezinhlaka ze-fluoropolymer: ukugcinwa kwezakhiwo ngemva kwesevisi ku-260°C (500°F), izakhiwo eziwusizo kokuthi -240°C (–400°F), ukungabi namandla kwamakhemikhali cishe wonke amakhemikhali ezimboni nezincibilikisi, nokungqubuzana okuphansi kanye nezindawo zokulwa nezinti.Izakhiwo ze-Dielectric zivelele futhi zizinzile ngokuvama kanye nezinga lokushisa.Imikhiqizo inokuqina okumaphakathi kanye nobude obuphakeme bokugcina.Esimeni somlilo, imikhiqizo ye-polymer PTFE imelana nokuvutha futhi ayikhuthazi ukusabalala kwelangabi.Lapho bevutha amalangabi avela kweminye imithombo, umnikelo wabo wokushisa mncane futhi unomusi omncane kakhulu.
I-polymer PTFE ilungiselelwe i-extrusion ngokuxuba nosizo lwe-extrusion oluwuketshezi.Impushana emanzi icindezelwa ku-cylindrical preform slug futhi ibekwe kusilinda se-extruder yohlobo lwenqama.Ngaphansi kwengcindezi ephezulu, ukwakheka kuphoqeleka ngokusebenzisa idayi yokuqeda ukuze kukhiqizwe ubuhlalu, ishubhu, noma okokunamathela.Izinto ezingafani, ezifana nocingo lwensimbi noma imicu yezinga eliphezulu lokushisa, zingagqunywa ngokuziphakela nge-axis yomphongolo we-extruder.Ngemuva kwe-extrusion, umkhiqizo uyisakhiwo esiphansi, kodwa esihlangene, esine-fibrous.i-polymer PTFE 640 ivame ukucutshungulwa ngokuqhubekayo, ngokushisa, ibe umkhiqizo we-resin eqinile, njenge-tubing.Heat isetshenziswa ngezinyathelo ezimbili, ezingenziwa emgqeni ne-extrusion noma ngokuhlukana.Okokugcoba kufanele kukhishwe kuqala, ngokuvamile ngokushisisa ngaphakathi kwebanga elingu-100–300°C (212–572°F).Isinyathelo esishisayo silandela ukuncibilikisa inhlaka emsulwa ngaphezu kwendawo yayo encibilikayo ecishe ibe ngu-342°C (648°F) futhi kukhiqizwe into engenamsebenzi, engenastress, futhi umkhiqizo oqinile we-PTFE resin.Uma kwenziwa emgqeni, izinyathelo zokushisa zinquma isivinini esiphezulu somugqa.Isilinganiso sokunciphisa (RR) isilinganiso sesigaba esiphambanayo se-preform kuleyo ye-extrudate;iyipharamitha ye-extrusion ethinta ukukhethwa kwebanga le-resin.
Isikhathi sokuthumela: May-04-2018