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.

Amabhande e-PTFE conveyor (amabhande e-Teflon) athuthukisa imigqa yokucubungula ukudla ngezinzuzo ezine ezibalulekile: ukusebenza okuphakeme okungeyona induku (kunciphisa imfucuza nokunamathela), ukubekezelela izinga lokushisa elibanzi (-100°C kuya ku-260°C kwenza ukubhaka kube yiqhwa), ukuhlanza kalula kanye nokumelana namagciwane (indawo engeyona i-porous, i-FDA ethobelanayo, ukusetshenziswa kwamandla okuhlala isikhathi eside), kanye nokusebenzisa amandla okuhlala isikhathi eside). Ifanele izinto ezibhakiwe, ukudla okuqandisiwe, ushokoledi, nemikhiqizo enamathelayo.

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.

Ukufana kokunamathela kwendwangu yokushisa ephezulu ye-PTFE kunqunywa izici ezine: ukwakheka kokumboza (usayizi wezinhlayiyana 0.15-0.35 μm, i-viscosity, okuqukethwe okuqinile), inqubo yokugqoka kanye ne-sintering (i-blade enamathela ekhethwayo ukuze ifane), ikhwalithi ye-substrate (iphethini yokuluka, ukwelashwa kwangaphambili), nendawo yokukhiqiza (20-25% R <60%). I-Dip + blade inqubo ehlanganisiwe ilinganisa ukungena nokushelela kwendawo.

Ukwelashwa kwe-PTFE ebusweni bokunamathisela okubophayo kusebenzisa izindlela ezimbili eziyinhloko: ukuncibilika kwezinga lokushisa eliphezulu (ukumelana nesimo sezulu esiphezulu, amandla angu-9.5 MPa ane-ejenti yokuhlanganisa, kodwa kukhulula amagesi anobuthi) kanye ne-sodium-naphthalene etching (5 MPa ukunamathela ngokushesha, iwindi elincane lamahora angu-24-48, imfucuza eyingozi). Khetha ngokusekelwe ekulawuleni imvelo kanye nokusebenza kwesikhathi eside ngokumelene nokusebenza kwesikhathi esifushane.

Ukuhlanzwa nokugcinwa ngendlela efanele kwandisa impilo yendwangu ye-PTFE enezinga eliphezulu lokushisa. Hlanza ngemva kokusetshenziswa nangemuva kokupholisa. Sebenzisa amabhulashi athambile, okokuhlanza okungathathi hlangothi, noma utshwala ukuze uthole amabala. Ungalokothi usebenzise ama-asidi/ama-alkali aqinile, i-bleach, noma ama-metal scrapers. Ukugcoba uwoyela we-silicone njalo kunciphisa ukuguga. Landela le mihlahlandlela ukuze ugweme ukulimala kokumboza.

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.

Ukuhlola ikhwalithi ye-emulsion ye-PTFE ihlanganisa izinkomba eziyisithupha ezibalulekile: okuqukethwe okuqinile (60±2% i-T/FSI 067-2021 ngayinye), i-pH (9.0-11.0), ukusatshalaliswa kosayizi wezinhlayiyana (i-laser diffraction/DLS), i-viscosity (12-30 mPa·s ku-25°C), ukuzinza (i-centrifugal, ukubukeka kweqhwa, ukugqama kwe-thaw). Lo mhlahlandlela uhlanganisa izindlela zokuhlola ezijwayelekile zepharamitha ngayinye.

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. Ngamakhemikhali 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.