Polymer galaw ai mungkan hta, polypropylene hte polyethylene zawn re ai shingra tara n re ai -polar plastic ntsa ni hta kaja dik htum n-gun rawng ai, dip shapraw lu ai, hka lim lu ai hpe lu la na matu gaw, n-gun n rawng ai mayak mahkak langai mi naw rai nga ai. Ndai arung arai ni gaw, shanhte a chemical hpe ninghkap lu ai atsam hte pat shingdang lu ai atsam ni a majaw manu shadan hkrum ai rai nna, ink, coatings (sh) adhesives ni hte ngang kang ai matut mahkai lam ra ai application ni hta n law htum n lu galaw ai. Ndai performance gap hpe shingdaw na matu, npu hpe galai shai ai hpaji masa ni gaw n mai garan kachyan ai lam ni byin wa sai. Dai ni hta, corona discharge tsi lajang ai lam gaw, n-gun atsam, manu jahpu-htuk manu ai lam, matut manoi bungli galaw lu ai atsam ni a majaw mying gumhkawng ai, npawt nhpang hpaga lam ladat langai hku nna dan dawng nga ai.
Corona ana zinli hpe shapraw kau ai lam a hpaji masa npawt tara ni
Corona tsi lajang ai lam gaw madung hku nna nbung n-gun hta plasma galaw ai lam re. Dai gaw, n-gun kaba ai-electrode hte lamu ga ntsa kaw nga ai roller lapran na plasma n-gun hpe shapraw nna, plastic film (sh) substrate gaw dai gap hku lai wa ai hku nna bungli galaw ai. Dai lang ai high voltage (kHz range hta law malawng) gaw grup yin nbung hpe ionize galaw ya nna, n-gun ja ai amyu bawsang ni law law lawm ai mu lu ai nhtoi (sh) filamentary discharge hpe shabyin ya ai. Ndai "katsi ai plasma" hta, lawt lu ai electron ni, ion ni, n-gun n rawng ai molecule ni, hte ultraviolet (UV) photon ni kayau kaya lawm nna, yawng gaw ahkyak ai n-gun hpe gun hpai nga ai.
Ndai n-gun ja ai plasma gaw polymer ntsa de hkrat wa ai shaloi, ahkyak ai physico-chemical n-gun law law gaw kalang ta byin pru wa ai. Madung ladat gaw, n-gun kaba ai electron ni hte UV nhtoi ni a majaw, npu hpe bawm jahkrat ai lam rai nna, dai gaw polymer n-gang ni hta ngang grin ai carbon-carbon hte carbon-hydrogen n-gun ni hpe daw kau ya ai. Ndai bond scission gaw ntsa kaw grai n-gun ja ai free radicals ni hpe shabyin ya ai. Dai hpang, ndai polymer-n-gun n rawng ai radical ni gaw nbung plasma hta nga ai oxygen hte nitrogen amyu bawsang ni (atomic oxygen, ozone, nitric oxide zawn re ai ni) ni hte lawan ladan htuk manu wa ai. Ndai htingnut ai lam gaw, polar bungli galaw ai hpung ni-grau nna carbonyl (C=O), carboxyl (COOH), hte hydroxyl (OH) hpung ni-ni hpe shawng de n-gun n rawng ai polymer ntsa de prat tup bang shangun ai. Ndai oxygen-lawm ai hpung ni hpe shalawm ai gaw plastic a ntsa na n-gun hpe grai jat shangun nna, hka hpe n ra sharawng ai kaw nna hka hpe ra sharawng ai de galai shai wa shangun ai. Ndai jat wa ai ntsa n-gun gaw, grau kaja ai wettability a matu ahkyak ai lam rai nga ai, dai gaw n-gun ja ai n-gun atsam a matu ra kadawn ai lam rai nga ai, hpa majaw nga yang, dai gaw ink, adhesives, coatings zawn re ai ntsin ni hpe maren mara garan ginhka lu nna, substrate hte grai hku hkau ai matut mahkai lam hpe byin shangun ai majaw re.
Akyu ara ni hte hpaga lam hta jai lang ai lam ni
Corona tsi ladat hpe hpaga lam shagu hta grai law hkra jai lang wa ai gaw hpaji masa hte sut masa akyu ara ni hpe n-gun jaw ai hku kahkyin gumdin ai majaw re ngu tsun ma ai. Shi a shawng lam akyu gaw, galaw shapraw ai lam hpe n jahten kau ai sha, matut manoi, in-line process hku nna hpaw shalawm lu ai atsam rai nga ai, dai gaw film galai shai ai zawn re ai high-volume galaw shapraw ai lam a matu ahkyak nga ai. Shi gaw nbung hpe reactive medium hku jai lang nna nbung n-gun hta bungli galaw ai majaw kaga plasma hpaji masa ni ra ai manu dan ai vacuum system ni hpe n ra sai. Ndai lam gaw, jak rung ni hpe grau asan sha, grau n-gun ja hkra galaw ya nna, gumhpraw bang ai lam hte bungli galaw ai lam hta jai lang ai gumhpraw ni hta grau nna manu dan ai-htuk manu ai lam ni hpe galaw ya ai.
Ndai akyu ni gaw corona tsi ladat hpe polyolefin film ni hpe galai shai na matu go-to ladat byin shangun ai. Ga shadawn kaba langai gaw, malu masha shinggyin ai, shingnip shingna, hte yawng a matu jai lang ai shingnip ni hta shara shagu hta nga ai, biaxial oriented polypropylene (BOPP) film rai nga ai. N gram lajang ai masa hta, BOPP gaw ntsa n-gun n law ai hte hka lim ai lam n kaja ai majaw, laika ka ai (sh) laminating galaw na matu n htap htuk ai. Corona tsi lajang ai lam gaw shi a ntsa hpe kaja wa shamu shamawt shangun nna, -madang tsaw ai graphic printing hpe galaw lu nna, n-gun rawng ai layers ni hte kam mai ai hku matut mahkai lu ai. Ndai hpaji hpe shinggyin la ai hta n-ga, polylactic acid (PLA) zawn re ai n-gun n rawng ai polymer ni hpe mung galai shai na matu jai lang ai. Hpaji sawk sagawn ai lam ni hta, corona tsi lajang ai gaw PLA ntsa hta bungli galaw lu ai oxygen hpung ni hpe bang ya lu ai majaw, n-gun hpe jat ya lu ai sha n-ga, polymer a biodegradation rate hpe mung lawan ladan galaw ya lu ai.
Shadawn sharam ai lam ni hte madi shadaw ai hpaji masa ni
Shi a uphkang ai lam nga tim, corona tsi gaw mungkan ting a matu hparan ladat n re ai sha, laksan shadawn sharam lam ni nga ai. Dai plasma byin pru wa ai gaw, n-gun n law ai-density rai nna, tsi lajang ai a akyu gaw, n-gun n law ai, dai arai a shinggan na molecular layers (nanometers loi mi) de sha shang lu ai. Ndai gaw sumla hkrung ni a matu ram sai raitim, masum-dimensional arai ni, hpun palawng ni, shing nrai, n-gun n rawng ai arung arai ni a matu pat shingdang ai lam byin wa ai. Dai tsi lajang ai a akyu gaw n bung ai shara ni hta n-bung ai rai nna, grai kaji ai electrode gap (1 mm grup yin) ra ai lam gaw, n-gun ja ai (sh) n-gun ja ai substrate ni hpe tsi lajang na matu tatut galaw mai ai shadawn sharam lam rai chye ai. Dai hta n-ga, tsi lajang da ai npu gaw "aging" hpe hkam sha lu ai, dai hta n-gun n law ai-molecular-weight oxidized arung arai ni htawt sit ai majaw (sh) polar group ni hpe bulk polymer de bai gram lajang ai majaw aten ladaw ni na wa ai hte maren, dai akyu gaw yawm mat wa ai.
Corona tsi lajang ai lam n hkum tsup ai application ni a matu, kaga ladat hte madi shadaw ai hpaji masa ni hpe jai lang ai.Wan n-ga tsi lajang aigaw kaga grai ngang grin ai nbung-hpyen ladat langai mi rai nga ai. Dai gaw plastic ntsa hpe gas wan n-gun hte kadun dawk shapraw nna bungli galaw ai, dai gaw corona tsi lajang ai hte bung ai free-radical ladat hku nna ntsa hpe oxidize galaw ya nna, polar hpung ni hpe shalawm ya ai. Wan n-gun hte tsi lajang ai lam gaw loi mi grau sung ai (4-9 nm) hpe hkra machyi shangun nna, grau htum ai arung arai ni, mawdaw daw ni zawn re ai yak hkak ai 3D hkrang ni, shing nrai, blow-molded bottles ni a matu grau ra sharawng ai. Hpaji sawk sagawn ai lam ni hta, corona discharge hpe akyu rawng ai hte madi shadaw ya ai lam hpe mu lu ai, nbung-to-gas ratio hte n-gun rawng ai aten zawn re ai parameters ni gaw, kaja dik htum galaw na matu ahkyak ai. Grau hkrak ai hte rawt jat galu kaba wa ai npu ntsa hpaji a matu,n-gun n law ai plasma tsi lajang aigrau kaja ai uphkang ai lam hpe jaw ya ai. Vacuum chamber kata hta hkrak hkrak lata la ai process gas (ga shadawn, oxygen, argon) hte galaw ai shaloi, grau n-gun ja ai, grau bung ai plasma hpe shabyin ya nna, n-gun kaba ai arung arai ni hpe n jahten kau ai sha, grau dam lada ai ntsa magam bungli amyu myu hpe galaw lu nna, grau sung ai galai shai lam ni hpe galaw lu ai. Manu grau hpu ai hte batch-madung tawn ai raitim, tsi mawan zawn re ai high-tech application ni a matu ra kadawn nga ai.
Ngut nna tsun ai hte htawm hpang hpe myit mada ai lam
Corona discharge tsi lajang ai lam gaw, shaning tsa lam hku nna plastic hte packaging hpaga lam ni a rawt jat galu kaba wa ai lam hpe madi shadaw ya ai ahkyak ai, hpaji masa-madung ai hpaji masa langai mi naw rai nga ai. Shi a plasma physics hpe tatut hta n-gun rawng ai manghkang ni hpe hparan na matu grai tsawm htap ai hku jai lang ai lam gaw, kaja ai engineering a sakse rai nga ai. Polar functional group ni hpe shalawm ai hku nna plastic ni a ntsa na chemistry hpe npawt nhpang hku nna galai shai kau ai hku nna, dai ni na aten na jai lang ai lam ni ra sharawng ai bungli hpe galaw lu shangun ai. Geometries hte arung arai nkau mi hta shadawn sharam ai lam ni hpe hkrum sha nga ai raitim, shi a lit gaw shim lum nga ai, hpa majaw nga yang, shi a n bung ai manu-film tsi lajang ai lam a matu lawan ai ratio a majaw re. Htawm hpang na ntsa lam galai shai ai lam gaw, corona tsi ladat hpe shara htawt sit ai hta n rai, wan n-gun hte low-pressure plasma zawn re ai kaga hpaji masa ni hte hpaji rawng ai hku hpawng de ai hta rai nga ai.