PTFE avɔ si ƒe dzoxɔxɔ lolo la mekpɔa dzoxɔxɔ ƒe kekeɖenudɔ (CTE) ƒe xexlẽdzesi si woɖo ɖi o. To vovo na ga alo plastik sesẽ la, eƒe kekeɖenudɔwɔwɔ kpɔa ŋusẽ ɖe fiberglass gɔmeɖoanyi avɔ, PTFE agba me nyawo, avɔlɔlɔ̃ ƒe wɔwɔme, kple dɔwɔwɔ ƒe dzoxɔxɔ ƒe didime dzi ɖekae.
Zi geɖe la, kuxi sesẽ sia hea kuxi siwo womele mɔ kpɔm na o vɛ: mɔ̃ siwo wotsɔ blaa nu, gasket siwo vuvu, ƒuƒoƒo siwo me woɖe lãgbalẽ le, alo nusiwo woɖena ɖe go siwo wotro. Dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ gɔmesese kple ɖoɖowɔwɔ le vevie ŋutɔ be woate ŋu awɔ dɔ ɣeyiɣi didi si ŋu kakaɖedzi le.
Aokai PTFE ku dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe nuwɔna me le dɔwɔwɔ geɖe me. Mɔfiame sia ɖe CTE ƒe asixɔxɔ siwo bɔ me eye wòna egbɔkpɔnu ade siwo ŋudɔ woate ŋu awɔ be woaƒo asa na kpododonu siwo do ƒome kple kekeɖenudɔ.
PTFE dzadzɛ ƒe dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ ƒe xexlẽdzesi si le fli me lolo: anɔ abe 10×10−5/°C (100–200 ppm/°C) le xɔme ƒe dzoxɔxɔ me, kple tɔtrɔ siwo menye fli me tɔ o ne dzoxɔxɔ le tɔtrɔm.
De dzesi vevi aɖe: PTFE toa kristalo ƒe akpa ƒe tɔtrɔwo me le abe 19°C kple 30°C ene , si hea gbeɖiɖi ƒe tɔtrɔ kpata si nye 1%–2% vɛ . Nɔnɔme sia bia be woalé ŋku ɖe eŋu etɔxɛe le dɔwɔwɔ siwo sɔ pɛpɛpɛ me. PTFE film dzadzɛ si didi meta 1 ate ŋu adzi sentimeta 1-2 ne eto xɔme ƒe dzoxɔxɔ me ko.
2. PTFE avɔ si ƒe dzoxɔxɔ lolo (fiberglass substrate) – CTE ƒe hatsotso si bɔ
Fiberglass ŋutɔ ƒe CTE si bɔbɔ ŋutɔ si ade. 5×10−6/°C (5 ppm/°C) , si subɔna abe ɖoɖo sesẽ aɖe ene be wòaxe mɔ ɖe PTFE ƒe kekeɖenudɔ nu eye wòaɖe avɔ si wowɔ vɔ ƒe dzoxɔxɔ ƒe kekeɖenudɔwɔwɔ le yameʋu me dzi akpɔtɔ ŋutɔ. Gake xɔtunu si wolɔ̃ la gakpɔtɔ nana kekena ɖe enu wu avɔ dzro si wotsɔ fiberglass wɔe.
Mɔfiame
CTE si wozãna ɖaa
Asixᴐxᴐ
Warp (le didime nu) .
3×10−2 – 5×10−5/°C ƒe didime
30–50 ppm/°C ƒe dzoxɔxɔ
Weft (si le atitsoga gome) .
4×10−5 – 6×10−5/°C
40–60 ppm/°C ƒe dzoxɔxɔ
Kekeɖenudɔwɔwɔ le titrime ƒe mɔ dzi ɖe dzesi wu le PTFE resin ƒe agbɔsɔsɔ si lolo wu ta. Le mɔ̃ɖaŋununya ta la, zi geɖe la, yameʋu me didime ƒe tɔtrɔwo koe wotsɔ ɖoa nɔƒe gbãtɔ.
Design Structural Clearances na Dzoxɔxɔ ƒe didime
1. Faa kekeɖenudɔwɔwɔ ƒe goawo
Ne wozãe abe gasket, dzoxɔxɔnutsitike, alo nusiwo woate ŋu aƒu gbe ene la, ƒo asa na eƒe axa eneawo katã léle ɖe te bliboe. Dzra nugbɔ ɖeka alo eve ya teti ɖo be wòaɖe mɔ na dzoxɔxɔ ƒe keke kple eƒe ʋuʋu si ŋu seɖoƒe meli na o.
2. Do siwo didi be woatsɔ aɖoe
Ne ehiã be nàbla gavi la, keke dowo ɖe enu alo nàxɔ do didi siwo me do le. Mègabla gaviawo sesĩe keŋkeŋ o; tsɔ gaskets kpe ɖe eŋu be nàdzra sliding allowance suesuesuewo ɖo. Esia wɔnɛ be nusi wotsɔ wɔe la kekena heɖea nutete manɔmee le bolt ƒe teƒewo.
3. Mlɔƒe si woma ɖe akpa vovovowo me
Ne èdi be yeaɖo avɔa ɖe teƒe gã aɖe la, mã avɔa ɖe akpa vovovowo me eye nàkeke avɔa ɖe enu wòanye milimeta 3–5 le kakɛawo dome, vevietɔ le didime gome. Esia xea mɔ na buckling be wòagakeke ɖe enu le span didiwo me o.
Ƒo asa na dzoxɔxɔ ƒe tsatsam kabakaba le Phase Transition Vevietɔ Dzoxɔxɔwo Me
PTFE kpea fu le gbeɖiɖi ƒe tɔtrɔ gã aɖe me le xɔme ƒe dzoxɔxɔ gbɔ – vevietɔ le 19°C kple 30°C ƒe akpa ƒe tɔtrɔ teƒewo. Ne dɔwɔnuwo trɔna enuenu le nufamɔ̃ kple yame ƒe dzoxɔxɔ dome la, mègate PTFE avɔa sesĩe akpa o.
Ne wodae ɖe dzoxɔxɔ sue aɖe me gake wowɔ dɔ le dzoxɔxɔ gã me la, avɔa adidi (le kpɔɖeŋu me, avɔ si didi meta 1 la keke milimeta geɖe ne wodo dzoe tso 25°C va ɖo 200°C).
De tensioning assemblies kple automatic compensation (spring-loaded alo counterweight systems) tsɔ wu be woaxe mɔ na wo sesĩe.
Se vevi: Mègate PTFE avɔa sesĩe gbeɖe le xɔme ƒe dzoxɔxɔ nu eye emegbe nàdo dzoe o – kekeɖenudɔa ana ƒutsotsoewo nado. Mègaƒoe sesĩe gbeɖe le dzoxɔxɔ gã me eye emegbe nàna wòafa o – eƒe ɖeɖe avuvu alo ate ɖe nusi wotsɔ wɔe dzi wòagbɔ eme.
Anti-Buckling Design na Overlaps kple Ƒuƒoƒowo
Overlap along the expansion direction , eye nàkpɔ egbɔ be nusiwo ƒo xlã wo ƒe kekeme wu didime si wogblɔ ɖi si sɔ gbɔ wu.
For sewn seams , gblẽ mɔɖeɖe si me mekɔ o ɖe ka siwo wotsɔ blaa nu dzi. Ne wotsɔ nusi léna ɖe nu ŋu si ƒe dzoxɔxɔ lolo blae la, tia aŋe si te ŋu trɔna be wòaxe mɔ na vuvu si kekeɖenudɔwɔwɔ ƒe xexlẽdzesi siwo mesɔ o hena vɛ o.
For multi-layer stacking , ƒo asa na anyigba bliboa ƒe kadodo. Do spot bonding alo partition fixing kple press strips be woaɖe mɔ na interlayer sliding – aɖe blistering kple delamination ɖa.
Tension Control na Dɔwɔwɔ ƒe Nɔnɔmewo
1. Conveyor belt ƒe dɔwɔwɔwo
De nusiwo wotsɔna tea avɔa ƒe kpekpeme si tsia tre ɖe wo nɔewo ŋu alo esiwo me spring-loaded automatic tensioners le be woaxɔ avɔa ƒe ɖiɖiɖeme le dzoxɔxɔ gã me eye wòaɖiɖi le dzoxɔxɔ si bɔbɔ me. Mègabla alidziblanua sesĩe akpa gbeɖe le dzoxɔxɔ gã me o – esia ana agba nagbɔ eme le vuvɔ ƒe ʋuʋu me. Ele be woaɖo alidziblanu ƒe tete ɖe dzoxɔxɔ si bɔbɔ wu si wokpɔ mɔ na le dɔwɔwɔ me.
2. Ðe asi le liners kple isolation sheets ŋu
Mlɔ anyi gbadzaa eye màte ɖe eŋu do ŋgɔ o. Tsɔ agbalẽtamɔ̃ siwo ƒe kpekpeme le wo ɖokui si alo esiwo le gbadzaa blae nyuie le mɔ ɖeka dzi be nàxe mɔ ɖe ʋuʋudedi siwo nɔa anyi ɖaa si dzoxɔxɔ ƒe kekeɖenudɔ hena vɛ nu.
Ðe Dzoxɔxɔ ƒe Tɔtɔ Sesẽwo Dzi Ðeɖe Akpɔtɔ
Kekeɖenudɔ si mesɔ o dzɔna ne wotsɔ avɔa ƒe akpa ɖeka de dzo gã aɖe me esime evelia gakpɔtɔ le fafam, si wɔnɛ be wòtrɔna.
Tia avɔ si wotsɔa fiberglass wɔe si le kpekpem wu, si ƒe kpekpeme lolo wu be wòaɖe aʋawɔwɔ dzi akpɔtɔ
Do ŋgɔ na megbedede ƒe aɖakaʋu le akpa si dzoxɔxɔ le sue ne ehiã (do ŋgɔ ƒo avɔa ale be wòadze gbadzaa le dɔwɔwɔ ƒe dzoxɔxɔ nu)
Dzadzraɖo Kple Beléle Na Wo Ɣesiaɣi
Le dzoxɔxɔ ƒe tsatsam ɣeyiɣi didi megbe la, PTFE akpɔ vuvɔ ƒe sisi ƒe tɔtrɔ , si ana didime ƒe didime si nɔa anyi ɖaa alo teƒeteƒewo ƒe gbɔdzɔgbɔdzɔ.
Lé ŋku ɖe teteɖeanyi ƒe sesẽme ŋu edziedzi eye nàgbugbɔ atrɔ asi le wo ŋu – ate ŋu ahiã be woagbugbɔ abla alidziblanuawo le dzoxɔxɔ ƒe tsatsam ʋee gbãtɔawo megbe.
Dzra bulges kple delamination ɖo enumake be nàƒo asa na nuteɖeamedzi ƒe susu tsɔtsɔ ɖe nu ŋu kple vuvu.
Nuŋlɔɖi kekeɖenudɔwɔwɔ – ne alidziblanu aɖe kekena ɣesiaɣi wu asitɔtrɔ ƒe didime la, ate ŋu ahiã be woaɖɔlii alo woatsɔ CTE-si sɔ kple wo nɔewo ƒe gɔmeɖoanyi bubu.
Aokai PTFE kafukafu: Le dɔwɔwɔ siwo me dzoxɔxɔ ƒe tsatsam si gbɔ eme le (le kpɔɖeŋu me, oven conveyors cycling tso ambient yi 250°C zi geɖe gbesiagbe), míeɖo aɖaŋu na avɔ si me fiberglass sɔ gbɔ ɖo (CTE si bɔbɔ ɖe anyi) kple automatic tension monitoring.
Kpuie ko la – Dzoxɔxɔ ƒe Kekeɖenudɔwɔwɔ ƒe Aɖaŋuɖoɖo ƒe Dzesidegbalẽ
Kuxi
Nusi Gbɔ Wòtso
Ŋuɖoɖo
Buckling (ƒutsotsoewo) .
Avɔ kekeɖenudɔ si me teƒe aɖeke mele be woatsi o
Free edges, kekeɖenudɔwɔwɔ, segmented laying
Vuvu le nusiwo wotsɔ blaa nu ŋu
Kekeɖenudɔwɔwɔ ƒe nuteɖeamedzi si ŋu woxe mɔ ɖo
Do siwo me do le, ke menye gavi siwo wobla sesĩe o
Delamination/ʋuʋudedi
Kekeɖenudɔwɔwɔ si mesɔ o le ƒuƒoƒoawo dome
Spot bonding, ƒo asa na anyigba bliboa ƒe adhesion
Conveyor belt slack / sesẽ
Didime ƒe tɔtrɔ si nɔa te ɖe dzoxɔxɔ dzi
tensioner si wowɔna le eɖokui si (spring/counterweight) .
Warping tso gradient gbɔ
Kekeɖenudɔ si mesɔ o le avɔ dzi
Kplamatsedonu si nɔa anyi ɣeaɖewoɣi, si woɖo do ŋgɔ be wòatrɔ megbe
Vuvɔ ƒe sisi didi
Ɣeyiɣi didi ƒe ʋuʋu le masɔmasɔ te
Dzodzro edziedzi kple egbugbɔgaɖɔɖo
Aokai PTFE naa PTFE avɔ si ƒe dzoxɔxɔ lolo si ŋu CTE ƒe asixɔxɔ siwo woŋlɔ ɖi eye ate ŋu akafu dzesi tɔxɛwo na wò dɔwɔwɔ ƒe dzoxɔxɔ ƒe didime. Te ɖe mía ŋu hena mɔ̃ɖaŋununya ŋuti nyatakaka gbalẽviwo kple dɔbiagbalẽviwo ƒe ɖoɖowɔwɔ ƒe kpekpeɖeŋu.
