Isiphelo esisikiweyo isakhiwo sobuso be-PTFE iteyiphu yobushushu obuphezulu buchaphazela ngokuthe ngqo ukuncamathela okuncamathelayo kunye nokuphakanyiswa komphetho ngexesha lesicelo. Ukucandwa okulambathayo (iincakuba ezibuthuntu, i-engile engafanelekanga) kudala imicu yeglu, ibhitya umaleko wokuncamathelisa, kwaye iveze iifiberglass burrs - ezikhokelela ekujuxuzeni, ekudibaneni okubuthathaka, kunye nokuphakamisa phantsi kobushushu okanye ukuxinana. Ubuso besiphelo esingaqhelekanga (i-wavy, i-protruding) ibangela ukusabalalisa koxinzelelo olungalinganiyo, ukuqhuba i-adhesive creep ngexesha lokugcina. Ubuso besiphelo obufanelekileyo bugudileyo, bugungxulwe, kwaye akukho monakalo-usebenza njengetywina elivala i-adhesive kwaye iqinisekisa ukubopha okugcweleyo.

Ngexesha PTFE tape ukutyabeka, izinga volatilization ukunyibilika of abicah ngoxinzelelo-sensitive adhesive yinkqubo ebalulekileyo parameter. Ukukhawuleza kakhulu → ukusulwa komphezulu, ukungaphakami kakuhle, imingxunya (isinyibilikisi esivalekileyo), kunye nemingxuma (ukujiya okanye ungcoliseko). Ukucotha kakhulu → ukujiya, imiphetho eshinyeneyo, kunye nokumanzisa kwi-PTFE yamandla asezantsi. Esona sicwangciso sifanelekileyo: ukucotha kokuqala ukuguquguquka komgangatho kunye nokuphunyuka kweqamza, emva koko ukoma okukhawulezileyo ukuze kubunjwe. Sebenzisa izinyibilikisi ezixubeneyo (i-toluene/ixylene + ukomisa ngokukhawuleza) kunye nobushushu be-oven yegradient (ephantsi →phakathi → phezulu).

Iteyiphu yobushushu obuphezulu be-PTFE inokumelana nokutshiza kwetyuwa ebalaseleyo, kodwa iindawo ezibuthathaka ngumaleko wokuncamathelisa kunye nemiphetho ye-fiberglass substrate. Iindlela zokuvavanya: Uvavanyo lwe-1000h olungathathi hlangothi lwetyuwa yokutshiza (NSS), ukulinganisa ukugcinwa kwamandla e-peel (≥80% efunekayo), iziphene ezibonakalayo (ukuphakamisa, ukugqabhuka), kunye ne-metal substrate corrosion. Kwiindawo zaselwandle kunye netyuwa ephezulu-yenkungu: sebenzisa i-silicone ye-PSA (hayi i-acrylic), i-substrate ye-PTFE efakwe ngokupheleleyo, itywina imiphetho nge-sealant ekwazi ukumelana nemozulu, kwaye usebenzise i-primer kwiindawo zentsimbi.

I-PTFE i-tape yobushushu obuphezulu ilahlekelwa ukubambelela emva kokusetyenziswa ngokuphindaphindiweyo ngenxa yokungcoliswa komhlaba (uthuli, ioli ye-silicone), ukungaphumeleli kwe-adhesive cohesive (intsalela), okanye i-substrate bonding ebuthathaka. Izisombululo: i-silicone ye-high-crosslink ye-PSA (ukufuduka okuphantsi, ukulinganisa ukulinganisa / ukubamba amandla), unyango lwe-primer kwi-substrate ye-PTFE, i-dense fiberglass backing, kunye nokuphathwa ngokufanelekileyo (indawo ecocekileyo, i-peel epholileyo, i-angle ye-180 °). Uvavanyo lobungakanani luqinisekisa ukuphuculwa.

I-PTFE i-tape ephezulu yokushisa egcinwe phantsi kweemeko ezichaziweyo (10-25 ° C, 40-70% RH, kude ne-UV / uxinzelelo olunzima) inobomi beshelufu obuqhelekileyo beenyanga ezi-3-6 (amabakala e-premium ukuya kwiinyanga ezili-12). Imigangatho ephambili yokuthotywa: amandla e-peel akufanele awele ngaphantsi kwe-70% yexabiso lokuqala; akukho ntsalela yokubambelela emva kokususwa kobushushu obuphezulu; akukho carbonization okanye ukuqhekeka kwiqondo lobushushu rated. Iitshekhi ezikhawulezayo: imvakalelo yokukhulula ngesandla, uvavanyo lwentsalela ye-260 ° C, kunye novavanyo lokuncipha kwe-lamination.

I-PTFE tape eqengqelekayo inokuphuhlisa i-interlayer adhesion (i-blocking) kunye nokudluliselwa kwe-adhesive ngexesha lokugcinwa kwexesha elide. Iimbangela: ifilimu ye-PTFE imemori elastiki kunye ne-silicone ye-PSA ikhwela phantsi koxinzelelo / ubushushu. Uthintelo: ukuxinezeleka kokuqina okujikajikayo (okuqinileyo ngaphandle, ukukhululeka kwangaphakathi) ngexesha lokwenziwa kwemveliso, kunye nokukhululwa kwetyabeka kwicala elingancamathiseliyo. Gcina kwi -15 ° C ukuya ku-40 ° C, 30-70% RH, ngokuthe tye kwii-racks, ujikeleze i-rolls ngekota. Kumabanga ancamathelayo ashinyeneyo, yongeza iphepha lokukhulula phakathi kweeleya.

Iiteyiphu ze-PTFE zobushushu obuphezulu obugcinwe kwifom yomqulu zinokubandezeleka ngenxa ye-interlayer adhesion (ukuthintela) kunye nokudluliselwa kwe-adhesive ukuya kwicala elinganamatheli. Iingcambu ezibangela: ifilimu ye-PTFE imemori elastiki kunye ne-silicone ye-PSA ikhwela phantsi koxinzelelo kunye nobushushu. Isisombululo: I-gradient winding tension - iqinile kumaleya angaphandle, ikhululekile kumaleko angaphakathi - usebenzisa ulawulo lokuxinezeleka oluvaliweyo. Gcwalisa isambatho sokukhululwa, ukugcinwa okufanelekileyo (15-40 ° C, 30-70% RH), ukubekwa okuthe tye, kunye nokujikeleza kwekota.

Iteyiphu yobushushu obuphezulu be-PTFE esetyenziswa kuqhagamshelwano lokutya kufuneka ihloniphe imida yobushushu obungqongqo: ≤260°C ukusetyenziswa rhoqo (akukho mda wexesha), 260-300 °C ukuya kuthi ga kwimizuzu engama-30 kuphela, kwaye> 300 °C akuvumelekanga. Iteyiphu yeyokufowunelwa ngokungathanga ngqo kuphela (i-tray liners, i-heat sealer covers), hayi ukusonga ukutya ngokuthe ngqo. Ungaze usebenze ngaphandle komthwalo wokutya (ukufudumeza okomileyo). Faka enye indawo ukuba inamadyungudyungu, ityheli, okanye igugile.

I-Silicone i-adhesives-sensitive adhesives (PSA) ye-PTFE iiteyiphu zobushushu obuphezulu ziyahluka ngokubanzi ekusebenzeni kokuguga okuphezulu. I-Methylphenyl silicone PSA igcina> i-85% yamandla e-peel emva kwe-250 ° C / iintsuku ze-7, ngelixa uhlobo oluqhelekileyo lwe-methyl luhla kwi-50-70%. Iinkqubo ezongezelelweyo-ezinyangwayo (i-hydrosilylation) zinika uzinzo olungcono kakhulu kune-peroxide-nyango. Ngenkonzo eqhubekayo ye-200 ° C+, khetha amabanga aphezulu-phenyl anyangayo.

Iiteyiphu ze-PTFE zokubambelela ngoxinzelelo lwe-thermal-sensitive adhesive (PSA) kufuneka ziqhube ubushushu ngelixa zihlala zincangathi. Ukongeza izihluzi ziphucula ukuhanjiswa kwe-thermal kodwa kulimaza ukunamathela. Ibhalansi efanelekileyo isebenzisa i-spherical coarse particles (njenge-conductive skeleton) edityaniswe ngamasuntswana amahle (ukugcwalisa i-voids), ukugcina ukulayishwa okupheleleyo kwe-filler nje ngaphezu kwe-percolation threshold. Gwema iiflakes kunye nemicu; babulala intambo.