Itheyiphu ye-PTFE yokushisa okuphezulu esetshenziswa emimeseni evala ukushisa nemicu yokuvala iletha amanani amane abalulekile: ivimbela ukunamathela kwepulasitiki okuncibilikisiwe (iqeda isikhathi sokuphumula), ivikela ukufa kokuvalwa okumba eqolo, yenza kube lula ukushisa/ingcindezi yezivalo ezingaguquki, futhi inciphisa ukungqubuzana kwefilimu. Kunconywa itheyiphu ye-Fiberglass-backed (0.13-0.25 mm) ene-silicone PSA (≥260°C). I-Anti-static black tape yemigqa enesivinini esikhulu.

Isici sokuvimbela umhwamuko wamanzi wetheyiphu yokunamathisela ye-PTFE sinqunywa ngokuyinhloko ngokulimala kokumboza (ama-micropores, ama-microcracks, ama-fiber wicking) kune-PTFE's intrinsic hydrophobicity. Ifilimu ye-PTFE ehlanzekile inikeza i-WVTR emaphakathi kuphela. I-Multi-layer coating kanye ne-lamellar fillers (i-mica, ama-glass flakes) yenza umphumela we-labyrinth, unciphisa kakhulu ukuhanjiswa komphunga. Ukuze uvale uphawu lomswakama ophezulu, cacisa ama-coatings aminyene.

Ukumelana ne-Creep ye-PTFE high-temperature adhesive tape ngaphansi komthwalo ongaguquki wesikhathi eside (ikakhulukazi ku-200-260 ° C) kunqunywa izici ezimbili: i-silicone PSA crosslink density (i-crosslinking ephakeme ivimbela ukugeleza) kanye nohlobo lwe-substrate (i-fiberglass-reinforced PTFE imelana nokukhasa okubandayo; ifilimu ye-PTFE ehlanzekile iyakhasa). Ingcina engaxhunywanga ihluleka ngokushesha ekushiseni okuphezulu. Izendlalelo zokunamathela eziqinile zandisa ingozi yokukhuphuka.

Okwetheyiphu ye-PTFE yokushisa ephezulu esetshenziswa ezinhlelweni zokungqubuzana kokuslayida okulumayo, okujwayelekile okungeyona induku nokumelana nokushisa akwanele. Imibandela yokukhetha engukhiye: Ukulahleka kwe-Taber abrasion (<15 mg/1000 imijikelezo), imbozwe elungisiwe egcwalisiwe ye-PTFE (i-carbon/graphite/MoS₂), idatha yomkhawulo we-PV, amandla e-substrate (≥200 N/cm), nobulukhuni bokuhlangana (Ra 0.2-0.4 μm). Ukuvikelwa okufanelekile konqenqema nokuhlanganiswa okugcwele kubalulekile ukuze kuphile isikhathi eside.

I-PTFE substrate iyamelana ngokwemvelo nesifutho sikasawoti (ukumuncwa kwamanzi <0.01%). Kodwa-ke, ukusebenza kwe-tape jikelele kuncike ohlotsheni lokunamathela: i-silicone PSA imelana nezindawo zasolwandle (ukuhlolwa kwe-500-1000h ye-salt spray,> 80% ukugcinwa kwekhasi); i-acrylic PSA yehluleka. Ukwelashwa kwendawo efanele, ukusetshenziswa okungenabhamuza, nokuvala onqenqemeni nge-silicone sealant kubalulekile ekuthembekeni kwesikhathi eside ezisekelweni nasezikebheni zasogwini.

Itheyiphu ye-fiberglass ye-PTFE idinga izitifiketi ezintathu ezibalulekile zokuphepha: i-UL (ukuphepha kukagesi nelangabi), i-FDA (ukuthobela ukuxhumana nokudla), kanye ne-ISO 9001:2015 (ukuphathwa kwekhwalithi). Amateyipu aqinisekisiwe anikeza ukusebenza okungaguquki, impilo yesevisi ende, nezindleko eziphelele zobunikazi naphezu kwezindleko eziphezulu zangaphambili. Njalo qinisekisa izitifiketi ngokuqondile nezinhlangano ezikhiphayo.

Itheyiphu ye-PTFE yokushisa okuphezulu isetshenziswa kuzo zonke izigaba ezintathu zohlelo lokusebenza lwezokwelapha: ukuvikelwa kwemishini yokuvala inzalo (amathreyi e-autoclave, ukupakishwa kwe-heat-seal), ukwelashwa kwendawo yensimbi (i-low-friction coating, insulation kagesi), kanye namadivayisi afakelwayo (ama-vascular grafts, sutures). I-Biocompatibility iqinisekiswa nge-ISO 10993, futhi i-FDA 21 CFR 177.1550 isungula ukuphepha kwezinto eziyisisekelo.

Itheyiphu yokushisa ephezulu ye-PTFE inokumelana okungekuhle emisebeni ye-ionizing. Ngokuchayeka kwe-gamma engu-1 kGy kuphela, amandla e-tensile ehla aze afike ku-~25% owangempela. Ifaneleka kuphela ezindaweni ezinedosi ephansi (ukuvalwa kokudla/kwezokwelapha <10 kGy). Embonini yenuzi noma imikhumbi-mkhathi, sebenzisa i-polyimide noma i-PEEK esikhundleni salokho.

Kumateyipu e-PTFE aphezulu okushisa ngaphansi kokucwiliswa isikhathi eside, i-PTFE substrate ihlala ingasebenzi ngamakhemikhali, kodwa isendlalelo sokunamathisela iphoyinti elibuthakathaka. Amanzi enza buthaka i-PSA ye-silicone; amanzi anosawoti asheshisa ukugqwala. Kumakhemikhali anolaka, i-fluorosilicone noma i-perfluoropolyether adhesives - noma i-PTFE tape enganamatheli - iyadingeka. Peel ukulahlekelwa amandla kufika ku-40% ngemva kwamahora angu-48 emanzini.

Itheyiphu yezinga lokushisa eliphezulu ye-PTFE esetshenziswa ezinhlelweni zokuxhumana zokudla kufanele ihlale ngaphakathi kwemikhawulo ebekiwe yokushisa: ≤260°C ukuze isetshenziswe ngokuqhubekayo, ≤300°C ngeziqongo ezimfushane (amaminithi), futhi ingalokothi ibe ngaphezu kuka-327°C (ukubola). Imithetho ye-FDA ne-EU ayicacisi umkhawulo wesikhathi ojwayelekile - ubude bokuxhumana obuphephile buncike ezingeni lokushisa futhi kufanele kuqinisekiswe izivivinyo zokufuduka ezilingisa izimo zangempela.