Sintering na di krichכl step usay PTFE patikyula dεm de mεlt, fכ fכlכ, εn fכs insay wan kכntinyu film. Bɔt na di stej bak usay i kin izi fɔ lɛ pɔsin lɔs flat. Tɛnshɔn we nɔ ivin, we di tɛmpracha kin chenj kwik kwik wan, ɔ we yu nɔ ebul fɔ kɔntrol yusɛf fayn, dat kin mek yu gɛt wrinkles we yu nɔ go ebul fɔ chenj, wev ed, ɛn wɔp we yu nɔ go ebul fɔ kɔrɛkt afta dat.
Di kor prinsipul fכ mεnten flat na prεsis kכntrכl oba tεnshכn, tεmprachכ, εn rεstrεnt mεtכd dεm – we de mek i ebul fכ kכdכnayt shep fכ di fayv glas sabstεrayt εn mכlt PTFE kכtin.
Dis na di kɔr sɔlvishɔn fɔ mek weft nɔ shrinkage ɛn wavy selvedges. ɔfna . Dɛn fɔ put pin stenta (ɔ klip stenta) insay di sinta
1. Krɔs-sayz shep
Pin plet dɛn kin pier di ed dɛn fɔ di klos. bay we dεn de ajɔst di trak wit fכ di kכnvayכr chen dεm, dεn de aplay mild transvas tεnshכn – כ at minim, dεn de mεnten di כrijinal fabrik wit fכ kכntrכl tεmכl shrinkεj strεs fכ di sabstεrayt כnda ay hεt. If dɛn nɔ gɛt dis tin fɔ stɔp di klos, di klos in waid go smɔl ɛn di ed dɛn kin wev.
2. Kɔntrol fɔ lɔng tɛm
Prɛsis spid difrɛns bitwin frɔnt ɛn riya rɔla dɛn plus klos-lɔp tɛnsiɔn kɔntrol de gi ɔltra-lɔ ɛn stedi lɔnjitudinal tɛnsiɔn:
tεnshכn we pasmak – i de krak di kכt כ trigεr post-kכl shrinkage εn wכp
Insufishin tεnshכn – de mek di lεngthwise wrinkles (di fabrik 'bunches up')
Wan gradient curve we de hεt jεntεl, ful mεlt, εn slo kol de nid fכ εliminet thermal shock εn strεs-induced warpage.
1. Zɔn fɔ ɔt
Tεmprachכ de go כp sכmtεm rawnd di PTFE mεlt pכynt (327°C) fכ bεlεn intanεt εn sכfayz fכbrik tεmprachכ. di lokal ova hεt כ rεpid tεmprachכ surj de mek i nכ ivin shrinkage εn pεrmanεnt kris. Di gol na fɔ alaw di ɔt fɔ go insay wan kayn we tru di tik we di klos tik bifo i bigin fɔ mɛlt ful wan.
2. Sintering we de ol di zon
Kɔnstant tɛmpracha we dɛn kin kip na 380-400°C fɔ inof tɛm fɔ de. Dis:
Ful mɛlt PTFE patikyula dɛn insay wan kɔntinyu film
3. Cooling zone – dɛn kin ɔverluk am bɔku tɛm, yet i rili impɔtant
Dis na di stej usay wɔp kin apin mɔ. Slow kol i nid we yu de kip stent rεstrεnt te tεmprach כ dכn dכn di PTFE kristכlayzeshn pכynt (aprכx. 310°C ).
Kritikal rul: Rapid fכs εya kol de mek mismatch shrinkage bitwin di kכt εn sabstεrayt – we de rεsult in pεrsisεnt wכp כ kכl sεlvεd dεm we dεn nכ kin flat afta dat. Kip di fabrik restrain te di PTFE dɔn ful kristaliz ɛn lɔk insay in las shep.
Sabstret Prɛtritmɛnt ɛn Kɔtin Yunifɔmiti
Flatness we dɛn de sintering dipen pan wetin de apin bifo di fabrik go insay di ɔfna.
1. Pri-shrink di bays fabrik
Bifo PTFE impregnashɔn, fayv glas klos de ɔnda ay-tɛmpracha diwaks ɛn prɛ-shrink fɔ pul wef rɛsɛdyuɛl strɛs. Dis de ridyus sɛkɔndari shrinkage bad bad wan we dɛn de sinta ɛn i de lay di fawndeshɔn fɔ supia flatnɛs.
Aokai PTFE note: If i nɔ shrink bifo tɛm, di fayv glas go tray fɔ kɔntrakt we i de sinta – i go fɛt agens di stenta rɛstrayn ɛn mek di strɛs distribyushɔn nɔ ivin.
2. Yunifɔm kɔtin tik
Di PTFE impregnated layt fɔ ficha kɔnsistɛns tiknɛs akɔdin to di ɔl fabrik. di kכt we nכ ivin de mek difrεn mεlt tεm – tin εria dεm de mεlt fast pas tik εria dεm – we de jεnarεt strεs ripl dεm we sכm kayn כrεnj pil tεkschur εn de pwεl flat.
Ivin sכm sכm tik vεryushכn (0.01mm) kin mek di sכfa difεkt dεm we wi kin si.
Airflow Arenjmɛnt ɛn Prɛsishɔn Gayd Rola dɛn
1. Dizayn fɔ mek ɔt ɛya sirkuleshɔn
Adopt top-and-bottom counter-blow ɔ yunifom sirkulɛt ɔt ɛya insay di ɔfna fɔ avɔyd singl-sayd strɔng ayflɔ fɔ hit di klos dairekt wan – we de mek flutter mak. Stebul ɛya kusɛn sɔpɔt na ɔrizɔntal ɔvin de mek di klos nɔ sag oba lɔng suspɛnd span dɛn.
sכm sכm sכm klos dεm we de kכmכt de mek di tεnshכn nכ ikwal na di tu sayd dεm εn di yunilateral wrinkles
Wan ɔtomatik ed kɔrɛkshɔn sistem fɔ de
We yu de klin ɔltɛm, dat de mek di adhesive nɔ bɔku we de mek di lokaliz tɛnsiɔn chenj
Sɔmari – Di Flatnɛs Fɔmula
Pafɛkt flatnɛs nɔ de apin bay ɛksternal prɛs fɔs. insted, כnda prεsis planar rεstrεshכn fכ di stent mashin, yunifכm tεmprachכ εn tεnshכn mεlt εn intagret PTFE kכt wit fayv glas sabstεrayt insay wan smol kכmכpכsit, wit כl di rεsidyual strεs we fulכp rilis tru sכmtεm kol.
Divεlכpmεnt in eni singl prכsεs link go εvintually manifest as uneven fabric surface.
Prɔses Step
Flatness Rikwaymɛnt
Di Mod fɔ Failure
Sabstrat prɛtritmɛnt
Pre-shrunk, nɔ gɛt strɛs
Sɛkɔndari shrinkage we dɛn de sinta
Di tin we dɛn kin kɔt
Yunifɔm tik
Difrɛns mɛlt → ɔrɛnj pil
Stenter restraint we de mek pɔsin nɔ ebul fɔ du sɔntin
Pin plet dɛn, we dɛn kin kɔntrol wit
Weft shrinkage, wev edj dɛn
Tɛnshɔn kɔntrol
Low, stedi, klos-lɔp
Wrinkles (tu lɔw) ɔ wɔp (tu ay) .
Zon we de mek di ples wam
Smɔl smɔl, balans
Lokal ɔva ɔt → kris dɛn we go de sote go
Di zon we dɛn kin ol
380-400°C, inof fɔ de
Fushɔn we nɔ kɔmplit
Zon we de mek di ples kol
Slow, dɛn kin stɔp am dɔŋ 310°C
Warpage, ed dɛn we dɛn kɔl kɔl
Di we aw di briz de flɔ
Balans, nɔ dairekt impingement
Flutter mak dɛn
Rola dɛn we dɛn kin yuz
Paralel, klin
Yunilatɛral wrinkles
Aokai PTFE de kɔntrol ɔl dɛn paramita ya fɔ deliv PTFE klos wit garanti flatnɛs. Fɔ aplikeshɔn dɛn we nid ɔlta-flat fabrik (ɛgz., PCB laminating, solar laminators), wi de gi tayt flatnɛs spɛsifikɛshɔn ɛn ɔda flatnɛs prɔses.
