PTFE yog cov khoom siv tau zoo heev vim nws muaj cov khoom sib xyaw tshwj xeeb.PTFE yog chemically inert, weatherable, zoo heev hluav taws xob rwb thaiv tsev, kub tsis kam, tsis tshua muaj coefficient ntawm kev sib txhuam thiab tsis-nplaum zog.Shrinkable tubing kuj yog siv los ua yob npog thiab tiv thaiv cov khoom siv hluav taws xob lossis cov khoom siv.PTFE kuj tseem tuaj yeem skived los yog extruded rau hauv daim kab xev thiab cov yeeb yaj kiab uas tuaj yeem siv rau cov ntsaws ruaj ruaj thiab cov ntaub ntawv gasket.polymer yog lub npe lag luam paub txog polytetrafluoroethylene (PTFE) ua.
Ib yam ntawm txhua qib ntawm Polymer PTFE (polytetrafluoroethylene) hmoov zoo, nws tuaj yeem lubricated thiab extruded los ntawm cov txheej txheem muab tshuaj txhuam extrusion.Piv nrog rau lwm qib ntawm PTFE hmoov zoo, polymer PTFE yog ib qho resin uas muaj zog yaj thiab tsawg shrinkage.Nws yog ib qho zoo sib xws thiab yooj yim-rau-txheej resins.Nws yog qhov tsim nyog tshaj plaws rau cov khoom lag luam nrog nruab nrab-rau-siab reductionratio extrusion.
Cov khoom lag luam ua tau zoo ua los ntawm cov khoom zoo zoo polymer PTFE muab cov khoom zoo tshaj plaws ntawm cov fluoropolymer resins: tuav cov khoom tom qab kev pab cuam ntawm 260 ° C (500 ° F), cov khoom muaj txiaj ntsig ntawm -240 ° C (-400 ° F), tshuaj inertness rau ze li ntawm tag nrho cov kev lag luam tshuaj thiab cov kuab tshuaj, thiab tsis tshua muaj kev sib txhuam thiab antistick nto.Dielectric zog yog zoo heev thiab ruaj khov nrog zaus thiab kub.Cov khoom muaj nruab nrab nruj thiab siab kawg elongation.Nyob rau hauv ib tug nplaim taws teeb meem, cov khoom ntawm polymer PTFE tiv ignition thiab tsis lawv tus kheej txhawb cov nplaim taws.Thaum ignited los ntawm nplaim taws los ntawm lwm qhov chaw, lawv cov kev pab ntawm tshav kub yog me me thiab muaj pa taws heev.
polymer PTFE yog npaj rau extrusion los ntawm kev sib tov nrog cov kua extrusion pab.Cov hmoov ntub dej yog compressed rau hauv cylindrical preform slug thiab muab tso rau hauv lub tog raj kheej ntawm ram-hom extruder.Nyob rau hauv lub siab siab, cov muaj pes tsawg leeg yog yuam los ntawm ib tug tiav tuag los tsim beading, tubing, los yog coatings.Cov ntaub ntawv sib txawv, xws li cov hlau xaim lossis cov fiber ntau kub, tuaj yeem coated los ntawm kev pub lawv los ntawm axis ntawm extruder chim.Tom qab extrusion, cov khoom yog qhov tsawg-density, tab sis coherent, fibrous qauv.polymer PTFE 640 feem ntau yog ua tiav ntxiv, nrog cua sov, mus rau hauv cov khoom siv cob, xws li tubing.Heat yog thov nyob rau hauv ob kauj ruam, uas tej zaum yuav ua nyob rau hauv-line nrog extrusion los yog nyias.Lub lubricant yuav tsum tau muab tshem tawm ua ntej, feem ntau yog cua sov li ntawm 100-300 ° C (212-572 ° F).Cov kauj ruam sintering ua raws li kom yaj tus nkauj xwb cob saum nws cov crystalline melting point ntawm kwv yees li 342 ° C (648 ° F) thiab tsim ib qho tsis muaj dab tsi, tsis muaj kev ntxhov siab, thiab cov khoom ntawm PTFE resin.Thaum ua tiav hauv-kab, cov kauj ruam cua sov txiav txim siab qhov siab tshaj plaws kab ceev.Txo qhov sib piv (RR) yog qhov piv ntawm ntu ntu ntawm preform rau ntawm extrudate;nws yog ib qho extrusion parameter cuam tshuam rau kev xaiv ntawm qib resin.
Post lub sij hawm: May-04-2018