PTFE ndi zinthu zothandiza kwambiri chifukwa ali ndi kuphatikiza wapadera katundu.PTFE ndi mankhwala inert, weatherable, kwambiri kutchinjiriza magetsi, kutentha kukana, otsika coefficient wa mikangano ndi sanali zomatira katundu.Machubu ocheperako amagwiritsidwanso ntchito ngati zovundikira mpukutu komanso kuteteza zida kapena zida zamagetsi.PTFE ingathenso skived kapena extruded mu matepi ndi mafilimu angagwiritsidwe ntchito zidindo ndi gasket zipangizo.polima ndi dzina lodziwika bwino la malonda la polytetrafluoroethylene (PTFE) lopangidwa.
Chitsanzo cha magiredi onse a Polima PTFE (polytetrafluoroethylene) ufa wabwino, akhoza afewetsedwa ndi extruded ndi muyezo phala extrusion techniques.Poyerekeza ndi makalasi ena a PTFE ufa wabwino, polima PTFE ndi utomoni kuti wawonjezera Sungunulani mphamvu ndi otsika shrinkage.Ndi imodzi mwazogwirizana kwambiri komanso zosavuta kuzikonza.Ndizoyenera kwambiri pazogulitsa zokhala ndi ma extrusions apakati-mpaka-mmwamba.
Zopangidwa bwino zopangidwa kuchokera ku polima zowoneka bwino PTFE zimapereka mawonekedwe apamwamba kwambiri a utomoni wa fluoropolymer: kusungidwa kwa katundu pambuyo pa ntchito pa 260 ° C (500 ° F), zinthu zothandiza pa -240 ° C (-400 ° F), kusakhazikika kwamankhwala pafupifupi mankhwala onse a mafakitale ndi zosungunulira, komanso kugundana kochepa ndi malo oletsa ndodo.Ma dielectric ndi apamwamba komanso okhazikika komanso pafupipafupi komanso kutentha.Zogulitsa zimakhala ndi kuuma pang'ono komanso kutalika kwapamwamba kwambiri. Pamoto, zopangidwa ndi polima PTFE zimakana kuyaka ndipo sizimalimbikitsa kufalikira kwamoto.Akayatsidwa ndi lawi lochokera kuzinthu zina, chopereka chawo cha kutentha chimakhala chochepa komanso ndi utsi wochepa kwambiri.
polima PTFE wakonzekera extrusion ndi kusakaniza ndi madzi extrusion aid.Ufa wonyezimira umakanizidwa kukhala cylindrical preform slug ndikuyikidwa mu silinda ya mtundu wa nkhosa.Pansi pa kupsyinjika kwakukulu, kapangidwe kameneka kamakakamizika kupyolera mu kufa komaliza kuti apange mikanda, machubu, kapena zokutira.Zida zosiyana, monga waya wachitsulo kapena ulusi wotentha kwambiri, zimatha kuphimbidwa pozidyetsa kudzera muzitsulo za extruder mbiya.Pambuyo pa extrusion, mankhwalawa ndi otsika kwambiri, koma ogwirizana, opangidwa ndi fiber.polima PTFE 640 zambiri kukonzedwa patsogolo, ndi kutentha, mu olimba utomoni mankhwala, monga tubing.Heat ntchito mu masitepe awiri, amene akhoza kuchitidwa mu mzere ndi extrusion kapena padera.Mafuta ayenera kuchotsedwa poyamba, nthawi zambiri potenthetsa mkati mwa 100-300 ° C (212-572 ° F).A sintering sitepe kutsatira kusungunula namwali utomoni pamwamba pa crystalline kusungunuka malo ake pafupifupi 342°C (648°F) ndi kupanga wopanda kanthu, wopanda nkhawa, ndi mankhwala olimba PTFE utomoni.Pamene ikuchitika mu mzere, masitepe Kutentha kudziwa pazipita mzere liwiro.Reduction chiŵerengero (RR) ndi chiŵerengero cha mtanda gawo preform kuti extrudate;ndi gawo la extrusion lomwe likukhudza kusankha kwa utomoni.
Nthawi yotumiza: May-04-2018