Waati PTFE nɔrɔlen bɛ kɛ ka fɛnw datugu minnu bɛ se ka ji sɔrɔ – i n’a fɔ ɛntɛrinɛti dakunw, HVAC flansɛw, walima kemikɛli minɛnw datugulanw – hakilina min bɛ kɛ tuma caman na, o ye ko PTFE ka jibɔbaliya bɛ jisuma balilan dafalen garanti. O tɛ tiɲɛ ye tuma bɛɛ.
Ji lafiɲɛbɔlanw ye fɛn misɛnninw ye. U bɛ se ka jɛnsɛn ni mikroskɔpi siraw ye, ji caman tɛ se ka minnu kɛ. PTFE kase ji labɔli hakɛ yɛrɛ (WVTR) bɛ bɔ PTFE ka kemikaliya la kosɛbɛ, wa a bɛ bɔ kosɛbɛ finimugu jɔcogo la – nafamafɛnw i n’a fɔ mikroporow, mikrokariw, ani fiyɛri dafalen tɛ.
Aokai PTFE ye WVTR sɛgɛsɛgɛ finimuguw dilanni ni u janya bɛɛ la. Nin barokun in b’a ɲɛfɔ cogo min na PTFE ka kemikaliya jɔcogo, a dacogo nɔgɔlenw, a bonya fɛɛrɛw, ani a falenfɛnw caman cili bɛ fara ɲɔgɔn kan walasa ka lafiɲɛbɔ barika baarakɛcogo dɔn.
PTFE Chimique Structure – Nafa ni Danyɔrɔ fila bɛɛ
1. Nafa minnu bɛ a la – Jiko ni kirisitalini
Suguya
Nafa min bɛ ji labɔli barika la
CF bonds, surface fanga dɔgɔyalen
Ji molekilɛriw man teli ka minɛ walima ka wuli PTFE sanfɛ – o ye barika fɔlɔ ye min bɛ ji doncogo bali
Kristalini ka bon (>90%) .
Kristali yɔrɔw bɛ ɲini ka se ka don ji la – molekiyɔmu jɛnsɛnni sira tɛ kristalɛw fɛ
2. Danyɔrɔw – Domaines amorphes ani fanga barikamaw intermolecules
Fanga barikama min bɛ molekiyɔmuw ni ɲɔgɔn cɛ PTFE molekiyɔmu cakɛdaw ni ɲɔgɔn cɛ
substantiels Volume libre-voids minnu bɛ domaines amorphes kɔnɔ, olu bɛ diffusion siraw da
PTFE filimu jɛlen saniyalen bɛ WVTR hakɛ cɛmancɛ dɔrɔn de di – a ka dɔgɔ kosɛbɛ ni PVDC walima EVOH ye
PTFE tɛ barikalan dafalen ye a yɛrɛ la
Hakilila jɔnjɔnw : PTFE kɔnɔna na, o ye balilan ye min bɛ dantɛmɛ, a tɛ danfara ye. Kaseti baarakɛcogo ɲuman bɛ bɔ kosɛbɛ finimugu dafalenw na.
Coating Defects Critiques – Micropores, Microcracks, ani Fibre Wicking
O de ye fɛnba ye min bɛ barika kɛcogo waleyali ɲɛminɛ. PTFE nɔrɔlan fanba bɛ dilan ni PTFE jɛnsɛnni impregnation walima coating ye o kɔfɛ sintering ye, o waati la, nafamafɛnw bɛ sɔrɔ nɔgɔya la:
Nafa suguya
Formation Mechanism (Sɔrɔcogo) min bɛ Kɛ
A bɛ nɔ bila WVTR la
Micropores (mikoroporow) (micropores).
Solvants volatilisés ani resin fusion dafalen tɛ yɔrɔ lakolonw to minnu bɛ ɲɔgɔn kan
A bɛ sira surunw Dabɔ walasa ka lafiɲɛbɔ don
Microcracks (mikɔrɔ-fiɲɛw).
Sumaya bonya bɛnbaliya fibreglasi substrat ni PTFE cɛ, o bɛ kari finmanw daminɛ sintering/cooling kɔfɛ
A bɛ sira tilennenw da wuli ni finimugu ye
Fibrew ka capillaire wicking
Glasi fiyɛw sirili dafalen tɛ, o b’a to jisuma bɛ se ka wuli fiɲɛ ni resin cɛtigɛyɔrɔ la ka tɛmɛ kapilɛri wale fɛ
A bɛ se ka kɛ sababu ye ka vapor bypass kɛ finimugu lamini na
Kuncɛli waleyali: PTFE kaseti banbali ka WVTR bɛɛ lajɛlen bɛ ɲɛminɛ kosɛbɛ defect density , a tɛ ɲɛminɛ ni bulk PTFE resin kɔnɔna nafa ye.
Aokai PTFE bɛ PTFE nɔrɔlenw dilan ni finimugu density kɔrɔsilen ye. Ni baara minnu bɛ WVTR dɔgɔya ɲini (<15 g/m²·don), an bɛ an ka fɛn caman fɔ minnu bɛ datugu, o min bɛ baara kɛ ni impregnation pass saba ye walasa ka pinɛw datugu ka tugu ɲɔgɔn na ani ka microcrack density dɔgɔya.
Coating Thickness and Labyrinth Effect – Fɛɛrɛ minnu bɛ kɛ ka WVTR dɔgɔya
Ni dɔ farala finimugu janya kan, o bɛ lafiɲɛbɔ sira janya nka a tɛ dan ka jɔli nafamafɛnw datugu minnu bɛ yen dɔrɔn. Fɛɛrɛ minnu bɛ se ka kɛ ka ɲɛ, olu bɛ sɔrɔ jukɔrɔ:
Fɛɛrɛ
Fɛɛrɛ min bɛ Kɛ
Nafa sɔrɔli
A bɛ kɛ ni fɛn caman ye
Ni aw bɛ segin-ka-bɔ ni u sɔgɔli ye, o bɛ kɛ sababu ye ka finimugu minnu bɛ tugu o kɔ, olu bɛ se ka pinɛw datugu ani ka finimugu jukɔrɔla nafamayɔrɔw bali
Filɛri minnu tɛ se ka wuli (mika mugu, gilasi sɔgɔlenw) bɛ ɲagami PTFE dacogo la walasa ka ji molekilɛriw wajibiya u ka siraw tigɛli kɛ (labyrinth effect) .
A ka bon kosɛbɛ – a bɛ WVTR tigɛ kosɛbɛ
Coat kelen min ka bon
Yaala sira jan ka jan nka nafamafɛnw bɛ to
Dɔgɔya – a tɛ ladilikan di a kelen na
Aw ye aw janto fasafɛnw na: Ni aw ye fasa doni kojugu, o bɛna kɛ sababu ye ka fɛn dilannenw ka sɛgɛsɛgɛli ni u tɛ nɔrɔ cogo tiɲɛ. Balance (balance) de wajibiyalen don.
Surface Condition – Ji tɛ a la nka a tɛ ko latigɛ
PTFE dacogo min tɛ ji ye, ji bɛ ɲɔgɔn sɔrɔ yɔrɔ min na, o ka bon (a ka c’a la, o ye 110-120° ye), o bɛ ji filimu bɔli bali a sanfɛla la ani ka lafiɲɛbɔ fanga dɔgɔya cogo la min tɛ ɲɛsin a ma.
Nka: O nafa min bɛ sanfɛla la, o tɛ se ka kunbɛn min bɛ sɔrɔ kɔnɔna dacogo tiɲɛni fɛ. barika jugu Ni mikroporow walima faraw bɛ yen, jikuruw bɛna jɛnsɛn hali bi ka tɛmɛ a kan hali ni dugukolo sanfɛla jibɔcogo mana kɛ cogo o cogo.
Kuma surun – Barika baarakɛcogo bɛ bɔ nafamafɛnw kɔlɔsili la
Fɛn
Kɔnɔnafili min bɛ WVTR kan
Kɔrɔsili kɛcogo ɲuman
PTFE kristali kɔnɔna na
Basi hakɛ cɛmancɛ
Fixed – a tɛ se ka kɔlɔsi fɛn dilannen na
Micropores minnu bɛ bɔ sintering dafalen na
Sanfɛ (a bɛ sira surunw da) .
Aw bɛ sintering profile ɲɛ – nɛnɛ bɛ kɛ dɔɔni dɔɔni, funteni ka bon
Microcracks minnu bɛ bɔ thermal expansion mismatch la
A ka bon kosɛbɛ
A bɛ kɛ ni fɛn caman ye, a bɛ kɛ FEP cɛmancɛ la, a bɛ nɛnɛ dɔɔni dɔɔni
Fibre wicking (encapsulation dafalen tɛ) .
Jamanjan
Aw bɛ aw jija ka a falen dafalen na – aw bɛ dɛmɛ don finimugu gɛlɛnw na ni vacuum ye
Coating thickness (layer kelen) .
Fɛ́gɛn
A tɛ nɔ bɔ a kelen na
A bɛ kɛ ni fɛn caman ye
Kɔrɔta (a bɛ fiɲɛw datugu) .
Aw bɛ impregnation tɛmɛsira 2-4 ɲɛfɔ
Lamellar fillers (mika, gilasi sɔgɔlenw) .
A ka bon kosɛbɛ (effet labyrinthe) .
Aw bɛ 10-20 wt% fara a kan, ka jɛnsɛnni kɛcogo ɲuman kɛ
Falen + caman-caman faralen ɲɔgɔn kan
A ka ca (<10 g/m²·don) .
A ka fisa ni barikalan kɔrɔlenw ye
Fɛn laban min bɛ ta: Ni PTFE nɔrɔlan kɛra ka da tugu ni nɛnɛba ye, baarakɛcogo min bɛ sɔrɔ a dacogo la (micropores, cracks, fibre wicking) bɛ to a barika seko barikantanyaba ye. Sigili dannamɔgɔ bɛ kɛ densification furakɛli fɛ min kɔnɔ multi-layer coating ani filler modification . PTFE kasɛti jɛlen bɛ baara kɛ i n’a fɔ barikalan min bɛ se ka da a kan, min bɛ se ka baara caman kɛ cogo gɛlɛnw na, min bɛ funteni kɛlɛli caman wajibiya, ka sɔgɔsɔgɔ, nɛnɛ sabatili, ani bɔli baarakɛcogo min tɛ nɔrɔ ye, o bɛ kɛ waati kelen na – nka a tɛ kɛ i n’a fɔ barikalan min bɛ se ka da a kan, min ka bon kosɛbɛ i n’a fɔ nɛgɛso walima PVDC.
Kuma surun na , PTFE nɔrɔlen ka jisuma barikalan jogo tɛ dɔn PTFE ka jibɔbaliya dɔrɔn fɛ. PTFE kɔnɔna na ye barika hakɛ danmadɔ ye (WVTR 5-10 g/m²·don filimu min tɛ fiɲɛ sɔrɔ). Nka, kaseti waleyali bɛ tɔɔrɔ ni mikroporow ye, mikrokariw (ka bɔ funteni bonya ni fibreglasi bɛnbaliya la), ani fibre wicking – ka WVTR kɔrɔta ka se 50-200 g/m²·don ma.
Walasa ka WVTR dɔgɔyalen sɔrɔ (<15 g/m²·don), aw bɛ finimugu caman (3+ impregnation passes) ani/walima lamellar filler modification (10-20 wt% mica walima glass flakes) ɲɛfɔ. Labirinti nɔ min bɛ bɔ fasaw la, o bɛ jikuruw wajibiya ka siraw tigɛ minnu bɛ wuli, o bɛ dɔ bɔ kosɛbɛ a jiginni na. Nka, fasa doni caman bɛ se ka dɔ bɔ fɛnw sɛgɛsɛgɛli la ani baarakɛcogo la min tɛ nɔrɔ – balansi de ka kan.
Aw mago bɛ WVTR dɔgɔman PTFE nɔrɔlen na walasa ka a datugu ni ji ye wa? Aokai PTFE bɛ kalasi caman di minnu datugulen don ani minnu falen don fɛn caman na ni WVTR sɛgɛsɛgɛli kunnafoniw sɛbɛnnenw ye. Aw ye anw sɔrɔ ni aw ka WVTR wajibiyalenw ye, baarakɛcogo funteni, ani fɛn caman sɛgɛsɛgɛli magow.
Ni aw mago bɛ fɛɛrɛko paramɛtiriw ɲɛfɔlenw na, baarakɛcogo ɲɛminɛni, ani furaw la minnu bɛ kɛ ka kɛɲɛ ni an ka fɛn dilannenw ye minnu bɛ kɛ ka kɛɲɛ ni mɔgɔw sago ye i n’a fɔ PTFE fini min bɛ funteni caman bɔ, PTFE kasɛti nɔrɔlen min bɛ funteni caman na, PTFE mesh conveyor belt, seamless fuser belt, single-sided PTFE fabric, high-temperature resistant conveyor belt and heatproof fiberglass cloth , aw bɛ se ka anw sɔrɔ:
Ka jago hakilila sabati, n’o ye baarakɛcogo ɲuman ni tilennenya ye, an b’an yɛrɛ di ka fɛɛrɛw di minnu bɛ kɛ ka kɛɲɛ ni mɔgɔw sago ye, minnu bɛ kɛ yɔrɔ kelen na, ani ka kiliyanw dɛmɛ ni hakili ye.
