PTFE ntama a ɛyɛ hyew kɛse (PTFE-coated fiberglass) yɛ premium filter media ma tebea horow a emu yɛ den: flue gas mfutuma a woyi (cement, nwura a wɔhyew, fango boilers kosi 260°C), corrosive nsu filtration (acids, alkalis, ngo), aduan / nnuru sterile filtration, ne HEPA cleanroom filters. Fafa a ɛnyɛ nea ɛbata ho no mma mfutuma ntumi nkɔ mu na ɛma ɛyɛ mmerɛw sɛ wobɛhohoro ho. Membrane-laminated grades nya mframa bɔne a ɛba fam koraa.

PTFE ntama a ɛyɛ hyew kɛse kura anyinam ahoɔden a ɛkyɛn so fi -180°C kosi 260°C: volume resistivity >1013 Ω·cm wɔ 200°C, dielectric daa pintinn wɔ 2.0-2.1. Sɛ ɛboro 260°C a, PTFE yɛ mmerɛw, ɛporɔw boro 327°C, na ɛhwere insulation daa. Wɔ 0°C ase no, insulation no tu mpɔn nanso nea wɔde kata so no bɛyɛ brittle. Tra 260°C mu na ama woatumi ayɛ adwuma a wotumi de ho to so.

PTFE ntama a ɛyɛ hyew kɛse (PTFE-coated fiberglass) ye ma aduan conveyor belts esiane ne 260°C ɔhyew a ɛko tia, -70°C awɔw a ɛyɛ mmerɛw, ɛnyɛ nea ɛbata soro, ne FDA mmara so. Nneɛma atitiriw a wɔde di dwuma: fononoo a wɔde yɛ paanoo (bisket, paanoo, pizza), nneɛma a wɔde fa nnuan a wɔayam, nhama a ɛma ahwiesa yɛ nwini, akwan a wɔde yɛ nwini, ɔhyew a wɔde siw ano, ne roller wrapping. Ɛtew bere a wɔsɛe no ne bere a wɔde siesie nneɛma so.

Calendering – ntama a wɔde PTFE akata so a wɔde mia ahwehwɛ rollers a ɛyɛ hyew ntam wɔ 360-380°C – sesa ɔfasu no nsɛso kɛse, nea ɛma wogyae, sɛnea ɛmma nsu ntumi nkɔ mu, ne mfiridwuma mu adwumayɛ. Ɛtew roughness so fi Ra 0.5-1.0 μm kosi <0.05 μm, ɛto pinholes, ɛma sɛnea ɛko tia ɔsɛe no tu mpɔn, nanso ɛtew tetew ahoɔden ne sɛnea ɛyɛ mmerɛw so. Ɛho hia ma release liners ne anyinam ahoɔden insulation.

Nneɛma anan na ɛkyerɛ PTFE ntama a ɛyɛ hyew a ɛkorɔn a wɔde kata so pɛpɛɛpɛ: nea wɔde kata so (particle size 0.15-0.35 μm, viscosity, solid content), coating & sintering process (blade coating a wɔpɛ ma biakoyɛ), substrate su (weave pattern, pre-treatment), ne production environment (20-25°C, <60% RH). Dip + blade a wɔaka abom nhyehyɛe no kari pɛ wɔ penetration ne surface smoothness.

PTFE ntama a ɛyɛ hyew kɛse ne silicone ntama nyinaa de fiberglass ntama di dwuma sɛ nnyinaso nanso ɛsono wɔ nneɛma a wɔde kata so (PTFE resin vs silicone rɔba). PTFE di mu wɔ nea ɛnyɛ nea ɛbata, nea ɛko tia ɔsɛe, ne nnuru a ɛko tia kodu 260°C mu. Silicone ntama ma wotumi yɛ nsakrae a ɛkorɔn, ɛma anyinam ahoɔden siw ano, na ogya ntumi nhyew (ɛkɔ soro kodu 230°C). Gyina nea ɛho hia wo so paw.

PTFE ntama a ɛyɛ hyew kɛse ma nnuru a ɛyɛ soronko a ɛko tia, na egyina acid a ano yɛ den, alkalis, organic solvents, ne mframa a ɛporɔw ano. Saa asɛm yi ka nneɛma a ɛko tia, anohyeto ahorow (alkali dade a ayow, nneɛma a ano yɛ den a ɛma fluorin), ne nneɛma atitiriw te sɛ ɔhyew, sɛnea ɛdɔɔso, ne mfiri mu nhyɛso ho asɛm kɔ akyiri.

Ɛnyɛ ntama a wɔde fiberglass ayɛ nkutoo na wɔde PTFE nsu gu mu. Saa asɛm yi de substrates foforɔ 7 ba – aramid, carbon fiber, PBI, porous metal, graphite, asbestos (wɔayi afiri hɔ nkakrankakra), ne ceramic fillers – a wɔn dwumadie no su, mfasoɔ, anohyetoɔ, ne dwumadie titire.

Saa asɛm yi kyerɛkyerɛ nea enti a fiberglass ntama a alkali nnim ne ade a wɔpɛ sɛ wɔde yɛ PTFE ntama a ɛyɛ hyew kɛse no mu. Ɛkata nnuru bonding via silane coupling agents ne honam fam nneɛma atitiriw te sɛ ɔhyew a ɛyɛ den, dimensional stability, ne corrosion resistance – hwɛ hu sɛ ɛyɛ adwuma a ɛtra hɔ kyɛ wɔ mmeae a ɛyɛ den.