Yaushe Ana amfani da tef ɗin manne mai zafi mai zafi na PTFE a cikin aikace-aikacen da suka haɗa da tashin hankali mai dorewa, matsawa ƙarfi, ko ɗaukar nauyi - kamar riƙe da rufi a wuri a kan bututu mai zafi, ko aiki azaman haɗin ginin ƙarƙashin matsananciyar damuwa - matsala mai ɓoye na iya fitowa: creep.
Creep shine jinkirin, nakasar abu ta dindindin a ƙarƙashin nauyi akai-akai akan lokaci. A cikin zafin jiki, tef ɗin PTFE na iya zama kamar barga. Amma a zafin jiki na 200 ° C ko ma 260 ° C - kewayon aikin sa na yau da kullun - mannen Layer na iya yin laushi kuma yana gudana, kuma PTFE substrate na iya jurewa 'sanyi kwarara' (rara a ƙasa da wurin narkewa).
Aokai PTFE ya gwada halayen rarrafe a cikin dubban sa'o'i. Wannan labarin yana bayanin yadda ake kimanta creep, yadda manne Layer da substrate kowanne ke ba da gudummawa, da kuma waɗanne gine-ginen tef ɗin ke tsayayya da mafi kyawu.
Abin da ke Creep a cikin Tef ɗin PTFE - Girma Biyu
Creep da gaske yana nufin martanin viscoelastic na kayan. Layer na mannewa da maɗaukaki suna aiki ta hanyoyi daban-daban, duk da haka duka biyun suna shafar juriya na lalacewa gaba ɗaya.
Bangaren
Makanikai Mai Tsara
Mabuɗin Abubuwa
Manne Layer (silicone PSA)
Viscous kwarara a ƙarƙashin dorewar damuwa mai ƙarfi
Ƙimar Crosslink, nauyin kwayoyin halitta, ƙarfafa filler, kauri mai rufi
Kalubalen yanayin aiki: Kaset ɗin PTFE sau da yawa suna fuskantar lodi akai-akai a 200-260 ° C, da nisa fiye da iyakokin al'ada na manne-matsi na al'ada. Ana buƙatar ƙarin gwajin zafin jiki.
Abubuwan Lantarki na Adhesive - Silicone PSA
Yawancin kaset ɗin mannewa na PTFE suna ɗaukar mannen matsi na tushen silicone, wanda juriya mai zafi mai zafi ya dogara da abubuwan masu zuwa:
Factor
Tasiri kan Juriya na Creep
Ingantacciyar Hanya
Girman haɗin haɗin gwiwa
Haɗin haɗin kai mafi girma yana da cikakkiyar hanyar sadarwa na roba → ƙananan nakasar dindindin
Ƙaruwa (amma ba haka ba ne cewa an rasa matakin farko)
Yana haɓaka ƙarfin haɗin gwiwa sosai, yana ba da damar sake dawowa na roba (kamar roba) vs. viscous kwarara (kamar cingam)
Ƙara 5-15% mai ƙarfi mai ƙarfi
M shafi kauri
Yakin da ya fi kauri yana ba da damar ƙarin zamewa → mafi girma a ƙarƙashin kaya iri ɗaya
Yi amfani da siriri, sutura iri ɗaya don aikace-aikacen hana ɓarna
Interface manne
Rashin haɗin gwiwa yana haifar da kwasfa mai mannewa daga substrate → zamewar fuska (ba mai girma ba)
Yi amfani da madaidaicin siliki, tabbatar da tsaftataccen wuri
Maɓalli na ɗauka: Ƙarƙashin haɗin gwiwar silicone m yana fama da gazawar gaggawa a yanayin zafi. Babban kaset ɗin anti-creep yana amfani da siliki mai girma-crosslink-yawa tare da ƙarfafa filaye da murfin bakin ciki mai sarrafawa.
Tef mai zafi na Aokai PTFE yana amfani da siliki mai girma-yawan PSA tare da ƙarfafa silica mai ƙura. Gwajin juzu'i mai zaman kanta a 260 ° C (Lokacin 1000g, 12.5 × 25 mm zoba) yana nuna> 150 hours zuwa gazawa - dace da buƙatar aikace-aikacen ɗorewa mai zafi mai zafi.
Abubuwan Kaya - PTFE Mai Rufe Fiberglass vs. Pure PTFE Film
Ana amfani da kaset na yau da kullun guda biyu don kaset na PTFE, tare da aiki mai ban sha'awa daban-daban:
Nau'in Substrate
Juriya mai tsauri
Makanikai
Fim ɗin PTFE mai tsabta
Talakawa - mai saurin kamuwa da sananne kwararar sanyi (creep). Ko da a ƙarƙashin ƙananan kaya masu nisa da ke ƙasa da wurin narkewa (327°C), babban nakasar da ba za ta iya jurewa ba tana faruwa saboda zamewar sarkar kwayoyin halitta.
Ƙarfafa polymer → sarƙoƙi suna zamewa da juna a ƙarƙashin damuwa mai dorewa
Fiberglass masana'anta da aka cika da PTFE (mafi rinjaye don tef mai zafi)
Kyakkyawan - kwarangwal ɗin fiberglass ɗin da aka saka da kyau yana hana PTFE sanyi kwarara
Tsarin da aka haɗa: Filayen gilashi suna ɗaukar kaya, PTFE yana ba da ƙarancin sanda
Don madaidaicin fiberglass-ƙarfafa, juriya mai raɗaɗi yana ƙaddara ta:
Factor
Tasiri
Saƙa yawa da kauri
Yadudduka masu nauyi, masu nauyi → maɗaukakin ƙarfi mai ƙarfi → ƙananan rarrafe
Cikakkun PTFE mai cike da ruɗani gaba ɗaya mai ɗaukar nau'ikan fiberglass ɗin haɗe-haɗe don guje wa zamewar tsagewar tsaka-tsaki. Rashin isassun impregnation → saura PTFE a cikin masana'anta meshes yana rarrafe ƙarƙashin kaya
Substrate kauri & flatness
Maɗaukaki, ɗaki mai ɗaci → high flexural rigidity → ko da rarrabuwar damuwa → yana hana ɓarnar da ba a taɓa gani ba daga tattarawar damuwa.
Maɓalli mai ɗaukar nauyi: Don aikace-aikacen zafin jiki na akai-akai, kar a taɓa amfani da tef ɗin fim ɗin PTEF mai tsabta - zai yi rarrafe ba tare da juyowa ba. Koyaushe zaɓi tef ɗin PTFE mai ƙarfafa fiberglass.
Takaitawa - Yadda ake Tabbatar da Juriya a cikin Tef ɗin PTFE
Factor
Abin da ake nema
Abin da za a Guji
Nau'in m
Silicone PSA mai girma-crosslink-yawa tare da fumed silica filler
Silicone mai haɗin kai, acrylic PSA (mai rarrafe a ƙananan zafin jiki)
M kauri
Bakin ciki, rufin uniform (manufa 0.02-0.05 mm)
Maɗaukaki mai kauri (> 0.08 mm) - yana ba da damar zamewa
Nau'in substrate
Fiberglass-reinforced PTFE
Pure PTFE fim (sanyi creeps)
Substrate ingancin
Saƙa mai girma, mai cike da ciki, cikakken sintered
Saƙar sako-sako da, rashin isashen ciki, wani sashi na sintered
Haɗin kai tsakanin fuska
Magani na farko tsakanin m da substrate
Babu maɗaukaki → bawon mannewa maimakon girma mai rarrafe
Shawarwari mai aiki: Don aikace-aikacen zafin jiki akai-akai (misali, kunsa mai rufin bututu a ƙarƙashin tashin hankali, riƙe abubuwan da aka haɗa akan faranti masu zafi), nemi bayanan juzu'i a takamaiman zafin ku da kaya. Ƙayyade tef ɗin PTFE mai ƙarfafa fiberglass, ba tef ɗin fim ba. Tabbatar cewa mannen siliki ne mai girma-crosslink-density tare da filler.
A taƙaice , juriya mai raɗaɗi na tef ɗin manne mai zafi mai zafi na PTFE a ƙarƙashin ɗaukar nauyi na dindindin na dogon lokaci ya dogara da abubuwa biyu. Layin PSA na silicone dole ne ya kasance yana da babban madaidaicin haɗin gwiwa, masu ƙarfafa filaye (fumed silica), da siriri mai sikari don tsayayya da kwararar danko. Substrate dole ne ya zama fiberglass-reinforced PTFE - fim din PTFE mai tsabta zai sha sanyi mai sanyi a yanayin zafi mai zafi. kwarangwal ɗin fiberglass yana ɗaukar kaya kuma yana kiyaye abin da ke tattare da shi daidai gwargwado.
Lokacin zabar tef ɗin PTFE don aikace-aikacen zafin jiki akai-akai, kar a taɓa daidaitawa don tef ɗin fim ɗin PTFE mai tsabta. Koyaushe nemi bayanan juzu'i a yanayin zafin aikin ku. Kuma ku tuna: alakar da ke tsakanin manne da maɗauran maɗauran maɗauran maɗaukaki ma - musaya da aka yi musu magani suna hana zamewar fuska.
Kuna buƙatar tef ɗin PTFE mai juriya don ɗaukar nauyi akai-akai? Aokai PTFE yana ba da ingantaccen tef ɗin fiberglass tare da silicone mai girma-yawan giciye PSA, ingantacciyar gwajin juzu'i na 260°C. Tuntube mu tare da kaya, zafin jiki, da buƙatun tsawon lokaci.
Idan kuna buƙatar ƙarin ƙayyadaddun bayanai, jagororin aikace-aikacen, da gyare-gyaren gyare-gyare don cikakken samfurin samfurin mu ciki har da PTFE high-zazzabi zane, PTFE m tef, PTFE raga conveyor bel, sumul fuser bel, guda-gefe PTFE masana'anta, high-zazzabi resistant conveyor bel da zafi-resistant fiberglass zane , jin free to tuntube mu:
