Ɣe ka ɣi Wozãa PTFE ƒe adhesive tape tsɔ xea nusiwo te ŋu xɔa tsi – abe elektrɔnik-nulénuwo, HVAC flanges, alo atikewo ƒe nugoewo ƒe nutsyɔnu ene – susu si bɔ enye be PTFE ƒe tsivɔvɔ̃ naa kakaɖedzi be tsi ƒe dzoxɔxɔ ƒe mɔxenu deblibo aɖe li. Esia menyea nyateƒe ɣesiaɣi o.
Tsi ƒe dzoxɔxɔ ƒe moleculewo le sue ŋutɔ. Woate ŋu akaka to nusuekpɔmɔ̃ siwo dzi tsi gbogbo aɖewo mate ŋu ato o. Tsi ƒe dzoxɔxɔ ƒe kaka ŋutɔŋutɔ (WVTR) si le PTFE tape me menɔ te ɖe PTFE ƒe atikeŋutinunya dzi boo o eye wònɔ te ɖe nusi wotsɔ blae ƒe wɔwɔme dzi wu – nusiwo gblẽ abe micropores, microcracks, kple fiber encapsulation si mede blibo o ene.
Aokai PTFE ku WVTR me le nusiwo wotsɔ blaa nu ƒe atikewo kple woƒe titrimewo katã me. Nyati sia ɖe alesi PTFE ƒe atikewo ƒe wɔwɔme, nusiwo wotsɔ blae ƒe gbɔdzɔgbɔdzɔ, eƒe titrime ƒe mɔnuwo, kple nusiwo wotsɔ yɔa nu me ƒe tɔtrɔwo ƒoa ƒu tsɔ nyaa mɔxenu ƒe dɔwɔwɔe me.
PTFE Chemical Structure – Viɖe kple Seɖoƒe siaa
1. Viɖewo – Tsi vɔvɔ̃ kple kristalo ƒe nɔnɔme
Ŋutinu
Viɖe si le Tsi ƒe Dzoxɔxɔ ƒe Mɔxenu ŋu
CF kadodowo, anyigbadziŋusẽ si bɔbɔ
Tsi ƒe moleculewo mexɔa nu alo lɔ̃na le PTFE ƒe anyigba dzi kura o – mɔxenu vevitɔ si xea mɔ na tsi ƒe gege ɖe eme
Krystallinity si lolo (>90%) .
Krystal-nutowo me tsi ƒe dzoxɔxɔ mate ŋu age ɖe eme o kloe – molecule ƒe kakamɔ aɖeke meto kristalo me o
Molekyulãwo dome ŋusẽ si gbɔdzɔ le PTFE molecule kɔsɔkɔsɔwo dome
gã Free-volume voids siwo le amorphous domains me wɔa kakamɔwo
PTFE film sesẽ dzadzɛ naa WVTR si le titina ko – si bɔbɔ ɖe anyi sã wu PVDC alo EVOH
PTFE menye mɔxenu si de blibo le dzɔdzɔme nu o
Gɔmesese vevi: PTFE si le eme nye mɔxenu si sɔ, ke menye mɔxenu tɔxɛ o. Tepe ƒe dɔwɔwɔ ŋutɔŋutɔ nɔ te ɖe nusiwo wotsɔ blae ƒe gbɔdzɔgbɔdzɔwo dzi vevie.
Nu Vevi Siwo Le Nutsyɔtsyɔ Ŋu – Micropores, Microcracks, kple Fiber Wicking
Esiae nye nu vevitɔ si kpɔa mɔxenu ƒe dɔwɔwɔ ŋutɔŋutɔ dzi. Wowɔa PTFE ƒe nulénu akpa gãtɔ to PTFE ƒe kaka ƒe tsidede alo nutsyɔtsyɔ me eye wotsɔa sintering kplɔe ɖo, si me vodada siwo le wo me la dona bɔbɔe:
Gblẽƒe Ƒomevi
Mɔ̃ si Wotsɔna Wɔa Nuwoe
Ŋusẽkpɔɖeamedzi ɖe WVTR dzi
Nusuekpɔmɔ̃wo
Atike siwo me dzoxɔxɔ le kple aŋɔ ƒe fusion si mede blibo o gblẽa teƒe siwo do ƒome kple wo nɔewo
Ewɔa mɔ kpuiwo na yaƒoƒo ƒe gege ɖe eme
Nu suesuesuewo ƒe gbagbãƒewo
Dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe masɔmasɔ le fiberglass substrate kple PTFE dome hea gbagbã nyuiwo vɛ le sintering/cooling megbe
Eʋua mɔ siwo dzi woato tẽ to nutsyɔtsyɔ me
Kakawo ƒe ʋukawo ƒe ʋuʋu
Glass-kawo ƒe nutsyɔtsyɔ bliboe nana tsi ƒe dzoxɔxɔ te ŋu ƒoa xlã ka kple aŋɔ ƒe domedome to ʋukawo ƒe dɔwɔwɔ me
Enaa vapor bypass ƒoa xlã nusi wotsɔ blae la
Nyataƒoƒo ŋutɔŋutɔ: WVTR bliboa si le PTFE tape si wowu enu la koŋue kpɔa ŋusẽ ɖe nusiwo gblẽ ƒe kpekpeme dzi , ke menye nɔnɔme ŋutɔŋutɔ si le PTFE aŋɔ gbogbotɔ me o.
Aokai PTFE na PTFE adhesive tapes kple dziɖuɖu ƒe nutsyɔtsyɔ density. Le dɔwɔwɔ siwo bia WVTR si bɔbɔ (<15 g/m²·ŋkeke) gome la, míeɖo aɖaŋu na míaƒe multi-layer coated grade, si zãa impregnation pass etɔ̃ tsɔ tsyɔa pinholes dzi ɖe wo nɔewo yome eye wòɖea microcrack density dzi kpɔtɔna.
Ne wotsɔe de tsii enuenu eye wotsɔe ƒo ƒui la, wɔnɛ be nutsyɔnu siwo kplɔe ɖo la te ŋu tsyɔa do siwo me wotsɔa nu ƒoa nui la dzi eye wòɖea nusiwo le ete ƒe nɔnɔme madeamedziwo ɖa
Kɔkɔe – si wɔa dɔ wu
Lamellar filler ƒe tɔtrɔ
Wotsɔa nusiwo mewɔa dɔ o siwo wotsɔ yɔa nu me (mica powder, glass flakes) tsakana ɖe PTFE ƒe nutsyɔnu me be woazi tsi ƒe moleculewo dzi be woato mɔ siwo le tsatsam (labyrinth effect) .
Kɔkɔ ŋutɔ – etso WVTR dzi vevie
Awu ɖeka si le kpekpem wu
Kakamɔ didi wu gake nusiwo gblẽ le eŋu gakpɔtɔ li
Low – menye eya ɖeɖekoe wokafui o
Kpɔ nyuie le nusiwo wotsɔ yɔa nu ŋu: Ne wotsɔ nusiwo wotsɔ yɔa nu me fũu akpa ana nusiwo wowɔ vɔ ƒe asitɔtrɔ le nɔnɔmewo ŋu kple esiwo meléna ɖe nu ŋu o la nagblẽ. Ehiã be woada asɔ.
Anyigba ƒe Nɔnɔme – Tsivɔvɔ̃ gake Menye Nyametsotso O
Tsi ƒe PTFE ƒe nutsyɔnu si me tsi mele o la ƒe tsi ƒe kadodo ƒe dzogoe lolo (zi geɖe la, 110-120°), si xea mɔ na tsi ƒe film ƒe wɔwɔ atraɖii le eƒe gowo dzi eye wòɖea yaƒoƒo ƒe gege ɖe eme ƒe ʋuʋu ƒe ŋusẽ dzi kpɔtɔna le mɔ si mele tẽ o nu.
Gake: Viɖe sia si le anyigba dzi mate ŋu axe mɔ ɖe mɔxenu gbegblẽ si tso ememe nutsyɔnu ƒe gbegblẽ gbɔ o. Ne ʋuʋudedi suesuesuewo alo ʋuʋudediwo li la, tsi ƒe dzoxɔxɔ agakaka to eme kokoko eɖanye tsi ƒe vɔvɔ̃ le anyigba dzi o.
Kpuie ko la – Mɔxenu ƒe Dɔwɔwɔ Nɔ te ɖe Gblẽƒewo Dzi kpɔkpɔ Dzi
Memanu
Ŋusẽkpɔɖeamedzi ɖe WVTR dzi
Dziɖuɖu Ŋusẽkpɔɖeamedzi
PTFE ƒe kristalo ƒe nɔnɔme si le eme
Gɔmedzedze si le titina
Woɖɔe ɖo – womate ŋu aɖu edzi le nusi wowɔ me o
Micropores tso sintering si mede blibo o me
Kɔkɔ (ewɔa mɔ kpuiwo) .
Optimize sintering profile – fafa blewu, dzoxɔxɔ si kɔkɔ wu
Microcracks tso dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe masɔmasɔ me
Fiber wicking (si wometsɔ nutsyɔnu si mede blibo o) .
Kɔ
Kpɔ egbɔ be yede tsi bliboe – vacuum kpena ɖe avɔ ɣiwo ŋu
Nusi wotsɔ blae ƒe titrime (ɖekaɖeka) .
Bᴐbᴐ
Menye eya ɖeɖeko wɔa dɔ o
Nusiwo wotsɔ blaa nu geɖee
Kɔkɔ (etsyɔa nɔnɔme madeamedziwo dzi) .
Tsɔ impregnation pass 2-4 gblɔ
Lamellar-nu siwo wotsɔ yɔa nu me (mica, glass flakes) .
Kɔkɔ ŋutɔ (labyrinth ƒe ŋusẽkpɔɖeamedzi) .
Tsɔ 10-20 wt% kpe ɖe eŋu, na kaka wòanyo wu
Woyɔ + ƒuƒoƒo geɖe ƒe ƒuƒoƒo
Kɔkɔtɔ kekeake (<10 g/m²·ŋkeke)
Enyo wu na mɔxenu veviwo zazã
Nu mamlɛtɔ si woatsɔ ayi: Ne wotsɔ PTFE adhesive tape de nutrenu si me fafa le ŋutɔ la, nusiwo wotsɔ tsyɔ nu nu dzi ƒe vodada siwo tso dɔwɔwɔ me (micropores, cracks, fiber wicking) gakpɔtɔ nye gbɔdzɔgbɔdzɔ gãtɔ kekeake le eƒe mɔxenu ŋutete ŋu. Wokpɔa nutrenu si ŋu kakaɖedzi le to densification treatment si me multi-layer coating kple filler modification hã le . PTFE composite tape wɔa dɔ abe mɔxenu si dzi woate ŋu aka ɖo si wɔa dɔ geɖe le nɔnɔme sesẽ siwo bia dzoxɔxɔ ƒe tsitretsitsi gã, xɔxlɔ̃ ƒe tsitretsitsi, fafa ƒe liƒo, kple non-stick release performance le ɣeyiɣi ɖeka me – gake menye abe mɔxenu si le eɖokui si ultra-high abe ga foil alo PVDC ene o.
In summary , tsi ƒe dzoxɔxɔ mɔxenu ƒe nɔnɔme si le PTFE adhesive tape me menye to PTFE ƒe tsivɔvɔ̃ ɖeɖeko dzi o. PTFE si le eme nye mɔxenu si sɔ (WVTR 5-10 g/m²·ŋkeke na film si me nu gblẽ le o). Ke hã, tape ŋutɔŋutɔwo kpea fu tso micropores, microcracks (tso dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe masɔmasɔ kple fiberglass gbɔ), kple fiber wicking – si doa WVTR ɖe dzi va ɖoa 50-200 g/m²·ŋkeke.
Be nàkpɔ WVTR si bɔbɔ (<15 g/m²·ŋkeke) la, gblɔ nusi woatsɔ atsyɔ nu geɖe (3+ impregnation passes) kple/alo lamellar filler ƒe tɔtrɔ (10-20 wt% mica alo glass flakes). Labyrinth ƒe ŋusẽkpɔɖeamedzi si tso fillers gbɔ zi tsi ƒe dzoxɔxɔ dzi be wòato mɔ siwo le tsatsam, si ɖea eƒe kaka dzi kpɔtɔna ŋutɔ. Ke hã, filler loading si lolo ate ŋu aɖe asitɔtrɔ le nɔnɔmewo ŋu kple non-stick dɔwɔwɔ dzi akpɔtɔ – dadasɔ hiã.
Èhiã na PTFE ƒe nulénu si me WVTR mesɔ gbɔ ɖo o hena nutrenu si te ŋu sea tsidzadzaa? Aokai PTFE naa klass geɖe siwo wofa kple nusiwo wotsɔ yɔa nu me siwo ŋu wotrɔ asi le kple WVTR dodokpɔ ŋuti nyatakaka siwo woŋlɔ ɖi. Te ɖe mía ŋu kple wò WVTR si nèhiã, dɔwɔwɔ ƒe dzoxɔxɔ, kple asitɔtrɔ le nɔnɔmewo ŋu ƒe hiahiãwo.
Esi míelé asitsatsa ŋuti xexemenunya si nye dɔwɔwɔ nyuie kple fɔmaɖimaɖi me ɖe asi ta la, míetsɔ mía ɖokui na be míana egbɔkpɔnu siwo wowɔ ɖe ɖoɖo nu le teƒe ɖeka kple asisiwo subɔsubɔ si ŋu wobu nyuie.
