Kuphimba mofanana pa PTFE emulsion impregnation wa fiberglass nsalu ndi njira ya moyo wa mankhwala khalidwe. Zosafanana zokutira zimayambitsa: kulephera kwa ndodo (kumamatira pa malo oonda), kufooka kwamakina (kupsinjika kwamalingaliro, kung'ambika), kusakhazikika kwamagetsi (kuwonongeka kwamagetsi kumatsikira mpaka 1/10), kulowa kwamankhwala (kuwonongeka kwa pinhole), zovuta zamtundu (warpage), ndi zolakwika pakukonza (kuzungulira kwa lamba, kusiyanasiyana kwa makulidwe). Kupaka yunifolomu kumafuna kuwongolera bwino kwa kukhuthala kwa emulsion, kulimba kolimba, kukangana kwa nsalu, mipata yofinya, ndi mbiri yowumitsa zone / sintering.

Nsalu ya PTFE yotentha kwambiri imakhala ndi coefficient of thermal expansion (CTE) ya 30-60 ppm/°C (warp/weft) - yapamwamba kuposa fiberglass yokha koma yotsika kwambiri kuposa PTFE yoyera (100-200 ppm/°C). PTFE imasintha modzidzimutsa (1-2%) pa 19 ° C ndi 30 ° C kusintha kwa gawo. Kupewa kung'ung'udza, kung'ambika, ndi kung'ambika: zilolezo zamapangidwe kuti zikulitseni kwaulere, pewani kupindika ndi kutentha kwa gawo, gwiritsani ntchito ma tensioner pa malamba otumizira, ndipo gwiritsani ntchito anti-buckling overlop design. Kuyendera pafupipafupi kwa kuzizira ndikofunikira.

PTFE zowotchera nsalu zotentha kwambiri za PTFE zimapereka maubwino anayi ofunikira: kusagwira ntchito (palibe mafuta kapena ufa wofunikira, makeke osakhwima amamasulidwa bwino), kutentha kwakukulu (-70 ° C mpaka 260 ° C, otetezeka ku uvuni mpaka mufiriji), kugwiritsiridwanso ntchito (zikwizikwi, zosavuta kuyeretsa), komanso ngakhale kuwongolera kutentha (kuletsa kuyaka, bulauni moyenera). Mogwirizana ndi chakudya cha FDA, amatulutsa zikopa ndi kupitilira mateti a silikoni okhala ndi kutentha kwabwinoko komanso mawonekedwe owoneka bwino.

PTFE mkulu-kutentha nsalu n'kofunika mu zovala interlining makampani. Ntchito zazikulu: malamba osatha osatha amakina ophatikizana mosalekeza (amateteza zomatira zotentha zosungunuka, zomata zopanda makwinya), chivundikiro chosagwira ndodo ndi nsalu zomangira zosindikizira kutentha (amateteza ma platens kuti asaipitsidwe ndi zomatira), malamba otumizira madontho a madontho / zomatira zomatira kuyanika / sintering), ndi zovundikira nsapato zachitsulo zokanikizira zitsanzo. Kukhuthala kumachokera ku 0.13mm (padding yopepuka) mpaka 0.55mm (malamba onyamula katundu wolemera).

Fiberglass nsalu matenthedwe shrinkage ndiye chifukwa chachikulu cha PTFE tepi dimensional kusakhazikika. Pa kutentha kwa PTFE sintering (360-400 ° C), kupsinjika kotsalira koluka kumatulutsidwa. Ngati sichiletsedwa, nsalu imachepa; Ngati atalephereka, kupsinjika kobisika kumatsekeredwa, kumapangitsa kuchepa pang'onopang'ono pakuchiritsa zomatira (150-200 ° C) ndikutentha komaliza. Yankho: gwiritsani ntchito magalasi a fiberglass asanayambe kutentha ndi <0.5% shrinkage pa 400 ° C, kuchotsa kupsinjika kotsalira musanayambe kupaka.

Nsalu yotentha kwambiri ya PTFE (PTFE-yokutidwa ndi fiberglass) imapereka kukana kwamankhwala kwapadera, kupirira ma acid (kuphatikiza aqua regia), alkali amphamvu (kutentha kwachipinda), zosungunulira organic, ndi ma oxidizing agents. Kupatulapo: zitsulo zosungunuka za alkali ndi ma halogen otenthetsera kwambiri amaukira PTFE. Kuwonongeka kwa zokutira kumawonetsa magalasi a fiberglass ku hydrofluoric acid ndi ma alkali otentha kwambiri. Kutentha pamwamba pa 260 ° C kumachepetsa kukana. Pazinthu zambiri zama mankhwala, nsalu ya PTFE imakhalabe yokhazikika komanso yodalirika.

PTFE emulsion impregnation wa fiberglass nsalu amafuna othandizira osiyanasiyana kukwaniritsa ❖ kuyanika yunifolomu, adhesion amphamvu, ndi malo opanda chilema. Zowonjezera zazikulu ndizo: zonyowetsa (kuchepetsa kupsinjika kwa pamwamba, kupititsa patsogolo kulowa), thickeners (kuwongolera kukhuthala ndi kulemera kwa zokutira), zowongolera pH (kukhazikika emulsion pa pH 9-10), ma silane coupling agents (owonjezera kumamatira kugalasi), zida zopangira mafilimu (PFA/FEP ya sintering), zodzaza ntchito (zoletsa kubisala), zoletsa kubisala (kuchedwetsa kuyanika). Kusankhidwa kumatengera gawo lapansi komanso zofunikira pakuchita.

Nsalu yagalasi yowonjezeredwa ya fiberglass (nsalu ya ulusi wochuluka) imasiyana kwambiri ndi nsalu wamba ya fiberglass pamapangidwe a ulusi. Kupyolera mu chithandizo cha jeti ya mpweya wothamanga kwambiri, zitsulo zamagalasi zopitirira zimalekanitsidwa, zopindika, ndi kufinyidwa kukhala ulusi wowala ngati thonje. Izi zimapanga nsalu zokulirapo, zofewa zokhala ndi kutenthetsa kwapamwamba kwambiri (zosanjikiza mpweya), kufananiza bwino, kusefera kwapamwamba, komanso kukana kung'ambika / kusinthasintha - pamtengo wa mphamvu yotsika pang'ono. Amagwiritsidwa ntchito popanga ma gaskets otentha kwambiri, zokutira mapaipi, zikwama zosefera, ndi zisindikizo za uvuni.

Nsalu ya PTFE yotentha kwambiri (PTFE-yokutidwa ndi fiberglass) imakhala yocheperako, koma zinthu zina zimayambitsa dzimbiri nthawi zina. Kuukira kwachindunji kwa PTFE kumachitika ndi zitsulo zosungunuka za alkali (sodium, potaziyamu), ma fluorinating agents amphamvu (F₂, ClF₃) pa kutentha kwambiri, ndi alkalis amphamvu osungunuka pamwamba pa 300 ° C. Kudzimbiri kosalunjika kumachitika pamene hydrofluoric acid (HF), alkali yotentha kwambiri, kapena asidi wotentha wa phosphoric alowa ndi zopindika ndikuukira gawo lapansi la fiberglass. Pakuti kwambiri mankhwala utumiki, ntchito koyera PTFE filimu popanda fiberglass.

Nsalu yotentha kwambiri ya PTFE (PTFE-yokutidwa ndi fiberglass) imakhala ndi kukana kwamphamvu kwa kutentha kwapakati pa -70°C mpaka 260°C. Imatha kulekerera kutentha kwapang'onopang'ono, mwachitsanzo, kuchoka pa -50 ° C mufiriji kupita ku makina osindikizira otentha a 260 ° C. Maphunziro apamwamba amapulumuka ngakhale kuzizira kwadzidzidzi kuchokera ku 260 ° C mpaka 10 ° C madzi. Komabe, kugwedeza zinthu kuchokera kutentha pamwamba pa 300 ° C (pafupi ndi PTFE's 327 ° C melting point) kungayambitse kusweka ndi delamination mwamsanga. Gawo la fiberglass limapereka bata laling'ono; Chophimba cha PTFE ndiye cholepheretsa.