Coating uniformity bere a PTFE emulsion impregnation fiberglass ntama ne nkwa kwan a product su. Nneɛma a wɔde kata so a ɛnyɛ pɛpɛɛpɛ de ba: nea entumi nkɔ so (ɛbata mmeae a ɛyɛ tratraa), mfiri mu mmerɛwyɛ (adwennwen a ɛwɔ mu, ɛtetew), anyinam ahoɔden a entumi nnyina (breakdown voltage so tew kodu 1/10), nnuru a ɛkɔ mu (pinhole corrosion), dimensional issues (warpage), ne dwumadie mu sintɔ (belt wandering, thickness variation). Uniform coating hwehwɛ sɛ wɔhwɛ emulsion viscosity, solid content, ntama tension, squeeze gaps, ne multi-zone drying / sintering profiles so pɛpɛɛpɛ.

PTFE ntama a ɛyɛ hyew kɛse no wɔ coefficient of thermal expansion (CTE) a ɛyɛ 30-60 ppm/°C (warp/weft) – ɛkorɔn sen fiberglass nkutoo nanso ɛba fam koraa sen PTFE kronkron (100-200 ppm/°C). PTFE nya nsakraeɛ a ɛba mpofirim wɔ ne dodoɔ mu (1-2%) wɔ 19°C ne 30°C phase nsakraeɛ mu. Sɛnea ɛbɛyɛ a wobɛkwati buckling, tearing, ne delamination: design clearances ma free expansion, kwati tensioning denam phase transition temperatures so, fa automatic tensioners di dwuma wɔ conveyor belts so, na fa anti-buckling overlap design di dwuma. Ɛho hia sɛ wɔhwehwɛ mu daa sɛ awɔw a ɛsen fa mu anaa.

PTFE ntama a wɔde to paanoo a ɛyɛ hyew kɛse no de mfaso atitiriw anan ma: adwumayɛ a ɛnyɛ nea ɛbata ho (ɛho nhia ngo anaa esiam, paanoo a ɛyɛ mmerɛw no gyae ma ɛho tew), ɔhyew a ɛtrɛw (-70°C kosi 260°C, ahobammɔ wom ma fononoo mu kɔ frigye mu), wotumi san de di dwuma bio (kyinhyia mpempem pii, ɛnyɛ den sɛ wobɛhohoro), ne ɔhyew a ɛkɔ mpo (ɛsiw ɔhyew ano, browning a ɛkari pɛ). Aduan-grade FDA compliant, wɔtra hɔ kyɛ sen parchment krataa na wɔyɛ adwuma sen silicone mats a ɔhyew a ɛkɔ so yiye na ɛyɛ fɛ wɔ soro texture.

PTFE ntama a ɛyɛ hyew kɛse ho hia wɔ ntade a wɔde hyɛ ntam adwuma mu. Nneɛma atitiriw a wɔde di dwuma: conveyor belts a enni awiei a wɔde kɔ so fusing mfiri (siw ɔhyew a ɛyɛ hyew adhesive a ɛbata ho, wrinkle-free conveying), non-stick cover ne padding ntama ma flat heat press (ɛbɔ platens ho ban fi adhesive efĩ ho), conveyor belts ma dot paste/powder coating lines (ɛkura adhesive dots a enni dɛm bere a ɛyow/sintering), ne dade mpaboa kataso a wɔde yɛ nhwɛsode a wɔde mia. Ne kɛse fi 0.13mm (hare padding) kosi 0.55mm (adwuma a emu yɛ duru conveyor belts).

Fiberglass ntama thermal shrinkage ne ade titiriw a ɛde PTFE tape dimensional instability ba. Wɔ PTFE sintering hyew (360-400°C) mu no, wogyae nwene nhyɛso a aka no. Sɛ wɔanhyɛ no so a, ntama no twetwe; sɛ wɔhyɛ so a, wɔde nhyɛso a ahintaw no to mu, na ɛma akyiri yi ɛtwetwe bere a wɔde ntama resa (150-200°C) ne ɔhyew a wɔde di dwuma awiei no. Ano aduru: fa fiberglass a wɔadi kan ayɛ no hyew a ɛyɛ <0.5% a ɛtwetwe wɔ 400°C di dwuma, na yi nhyɛso a aka no fi hɔ ansa na wode akata so.

PTFE ntama a ɛyɛ hyew kɛse (PTFE-coated fiberglass) ma nnuru a ɛyɛ soronko a ɛko tia, na egyina acid a wɔahyɛ no den (a aqua regia ka ho), alkalis a ano yɛ den (wɔ dan mu hyew mu), organic solvents, ne oxidizing agents ano. Nea ɛka ho: alkali dade a wɔabɔ ne halogen nnuru a ɛyɛ hyew kɛse tow hyɛ PTFE so. Nneɛma a wɔde kata so a ɛsɛe no ma fiberglass nya hydrofluoric acid ne alkali a ɛyɛ hyew a ɛyɛ hyew. Ɔhyew a ɛboro 260°C ma ahoɔden a ɛko tia no so tew. Wɔ nnuru a atwa yɛn ho ahyia dodow no ara fam no, PTFE ntama da so ara yɛ nea ɛyɛ den yiye na wotumi de ho to so.

PTFE emulsion impregnation of fiberglass ntama hwehwɛ aboafo ahorow na ama wɔanya biako coating, adhesion a emu yɛ den, ne sintɔ-free surfaces. Nneɛma atitiriw a wɔde ka ho ne: nneɛma a ɛma nsuo (ɛtew ɔfasuo so nhyɛsoɔ so, ɛma nsuo a ɛkɔ mu no tu mpɔn), nneɛma a ɛma ɛyɛ den (ɛhwɛ viscosity ne coating weight so), pH regulators (ɛma emulsion no gyina wɔ pH 9-10), silane coupling agents (ɛma ahwehwɛ a ɛbata ho no yɛ kɛseɛ), film-forming aids (PFA/FEP for sintering), functional fillers (wear resistance, conductivity), defoamers (siw ano pinholes), ne humectants (a ɛyow brɛoo). Paw gyina substrate ne adwumayɛ ahwehwɛde so.

Fiberglass ntama a wɔatrɛw mu (ntama a wɔde asaawa ayɛ a ɛdɔɔso) yɛ soronko koraa wɔ ntama a wɔde fiberglass ayɛ a wɔtaa de di dwuma ho wɔ asaawa nhyehyɛe mu. Ɛdenam mframa a ano yɛ den a wɔde yɛ adwuma so no, wɔtetew ahwehwɛ nhama a ɛkɔ so no mu, twitwiw, na wɔde hyɛ asaawa a ɛyɛ kɛse te sɛ kotoku mu. Eyi ma ntama a ɛyɛ den, ɛyɛ mmerɛw a ɛwɔ ɔhyew a ɛkorɔn (mframa a wɔakyekyere), ɛyɛ nea ɛne ne ho hyia yiye, filtration efficiency a ɛkorɔn, ne tear/flex resistance a ɛkɔ anim – a ɛho ka yɛ tensile ahoɔden a ɛba fam kakra. Wɔde yɛ gasket a ɛyɛ hyew kɛse, paipu wraps, filter bags, ne oven seals.

Ɛkame ayɛ sɛ PTFE ntama a ɛyɛ hyew kɛse (PTFE-coated fiberglass) yɛ nea nnuru ntumi nyɛ adwuma, nanso nneɛma bi ma nsɛe wɔ tebea pɔtee bi mu. PTFE ntua tẽẽ ba wɔ alkali dade a wɔanwene (sodium, potassium), nneɛma a ɛyɛ den a ɛma fluorinating (F2, ClF3) wɔ ɔhyew a ɛkorɔn mu, ne alkali a ano yɛ den a wɔanwene a ɛboro 300°C so. Nsɛe a ɛnteɛ ba bere a hydrofluoric acid (HF), alkalis a ɛyɛ hyew a wɔahyɛ no den, anaa phosphoric acid a ɛyɛ hyew hyɛn nneɛma a wɔde kata so no mu sintɔ ahorow mu na ɛtow hyɛ fiberglass substrate no so no. Sɛ wopɛ nnuru a ɛtra so a, fa PTFE sini a ɛho tew a fiberglass nni mu di dwuma.

PTFE ntama a ɛyɛ hyew kɛse (PTFE-coated fiberglass) wɔ ɔhyew a ɛko tia a ɛkyɛn so wɔ ne dwumadi a ɛyɛ -70°C kosi 260°C mu. Etumi gyina ɔhyew kyinhyia a ɛkɔ ntɛmntɛm ano, s.e., sɛ efi -50°C frigye mu kɔ 260°C afiri a ɛyɛ hyew mu. Premium grades mpo tra ase sɛ onwini mpofirim fi 260°C kɔ 10°C nsu mu. Nanso, sɛ wobɔ ade no ahodwiriw fi ɔhyew a ɛboro 300°C (a ɛbɛn PTFE 327°C melting point) a, ɛbɛma mpaapaemu ne delamination ntɛm ara. Fiberglass substrate no ma dimensional gyina pintinn; PTFE a wɔde kata so no ne ade a ɛto ano hye.