Wɔ wiase a wɔde polymer yɛ adwuma mu no, sɛ wobenya adhesion a eye sen biara, a wotumi tintim, ne nsu a ɛyɛ nwini wɔ plastic a ɛnyɛ -polar plastic a efi awosu mu te sɛ polypropylene ne polyethylene so no da so ara yɛ asɛnnennen a ɛkɔ so daa. Saa nneɛma yi a wɔbu no sɛ ɛsom bo esiane nnuru a ɛko tia ne akwanside tumi nti no ntaa nyɛ adwuma yiye wɔ nneɛma a ɛhwehwɛ sɛ wɔde ink, nneɛma a wɔde kata so, anaa nneɛma a wɔde nkata so bɛkyekyere denneennen no mu. Nea ɛbɛyɛ na wɔatumi asiw adwumayɛ mu nsonsonoe yi ano no, mfiridwuma a wɔde sesa nneɛma a ɛwɔ soro no abɛyɛ nea ɛho hia. Eyinom mu no, corona discharge ayaresa da nsow sɛ mfiridwuma mu adeyɛ a ɛyɛ tweatibo, a agye din wɔ sɛnea ɛyɛ adwuma yiye, ɛho ka-etu mpɔn, ne tumi a ɛkɔ so yɛ adwuma no ho.
Nyansahu mu Nnyinasosɛm a Ɛfa Corona a Wɔtow Gu Ho
Corona ayaresa yɛ plasma adeyɛ titiriw wɔ wim nhyɛso mu. Ɛyɛ adwuma denam plasma a ɛma nsuo a ɛkɔ electrode a ɛwɔ ahoɔden a ɛkorɔn ne roller a ɛwɔ fam ntam, a plastic film anaa substrate no fa kwan no mu. Voltage a ɛkorɔn a wɔde di dwuma (mpɛn pii no ɛwɔ kHz kwan so) no ma mframa a atwa ho ahyia no yɛ ion, na ɛma hann a wotumi hu anaasɛ nhama a ɛyɛ hyew a ahoɔden wom pii ba. Saa "plasma a ɛyɛ nwini" yi yɛ ɛlɛtrɔnik a wɔde wɔn ho, ions, molecule ahorow a ɛtumi gyina hɔ pintinn, ne ultraviolet (UV) photons a wɔadi afra, a ne nyinaa kura ahoɔden a ɛho hia.
Sɛ saa plasma a ahoɔden wom yi to polymer no ani a, ɛkame ayɛ sɛ physico-nnuru mu nneyɛe atitiriw pii ba bere koro mu. Adwinnade titiriw ne sɛ wɔde ɛlɛtrɔnik ahoɔden -ahoɔden kɛse ne UV mframa a ɛpaapae carbon-carbon ne carbon-hydrogen nkitahodi a ɛyɛ den a ɛwɔ polymer nkɔnsɔnkɔnsɔn no mu no tow hyɛ asase ani. Saa bond scission yi ma free radicals a ɛyɛ adwuma kɛse wɔ soro. Akyiri yi, saa polymer-free radicals yi ne oxygen ne nitrogen ahorow (te sɛ atom oxygen, ozone, ne nitric oxide) a ɛwɔ mframa plasma mu no yɛ adwuma ntɛmntɛm. Saa adeyɛ yi ma wɔde polar dwumadi akuw-a ɛda nsow kɛse ne carbonyl (C=O), carboxyl (COOH), ne hydroxyl (OH) akuw-ka polymer ani a kan no na ɛnyɛ adwuma no ho daa. Saa akuw a oxygen-wɔ mu yi a wɔde ba no ma ahoɔden a ɛwɔ plastic no ani no kɔ soro kɛse, na ɛdan no fi nea ɛnyɛ nsu mu kɔ nea ɛpɛ nsu mu. Saa ahoɔden a ɛkɔ soro yi ne ade titiriw a ɛma nsu a ɛyɛ nwini tu mpɔn, a ɛyɛ ade titiriw a ɛsɛ sɛ wodi kan bata ho denneennen efisɛ ɛma nsu te sɛ ink, nneɛma a wɔde nkata so, ne nneɛma a wɔde kata so trɛw pɛpɛɛpɛ na ɛne nea ɛwɔ ase no di nkitaho kɛse.
Mfaso ne Mfiridwuma mu Nneɛma a Wɔde Di Dwuma
Wɔkyerɛ sɛ corona ayaresa a wɔagye atom kɛse wɔ nnwuma ahorow mu no fi mfiridwuma ne sikasɛm mu mfaso horow a ɛka bom a ɛyɛ nwonwa. Ne mfasoɔ titire ne sɛ ɛtumi ka bom sɛ ɛkɔ so, in{1}}line process a ɛnhaw production flow, a ɛho hia ma high-volume manufacturing te sɛ film converting. Ɛyɛ adwuma wɔ wim nhyɛso mu de mframa di dwuma sɛ ade a ɛma ɛyɛ adwuma, na ɛmma enhia sɛ wɔyɛ vacuum nhyehyɛe a ne bo yɛ den a plasma mfiridwuma afoforo hwehwɛ. Wei ma nnwinnade no yɛ mmerɛw, ɛyɛ den, na ɛho ka{5}}tu mpɔn kɛse wɔ sika kɛse a wɔde bɛto mu ne adwumayɛ ho ka nyinaa mu.
Saa mfasoɔ yi ma corona ayaresa yɛ ɔkwan a wɔfa so sesa polyolefin films. Nhwɛsoɔ titire ne biaxially oriented polypropylene (BOPP) film, adeɛ a ɛwɔ baabiara wɔ aduane a wɔde kyekyere nneɛma, adhesive tapes, ne general-purpose packaging mu. Wɔ ne tebea a wɔansiesie no mu no, BOPP nni ahoɔden a ɛba fam wɔ soro na ɛnyɛ nea ɛyɛ nwini yiye, na ɛma ɛnyɛ nea ɛfata sɛ wɔde tintim anaasɛ wɔde yɛ laminating. Corona ayaresa ma n’anim yɛ adwuma yiye, na ɛma wotumi tintim mfonini a ɛkorɔn-na wotumi de ho to so sɛ ɛne ntama a wɔde nkata so bom. Wɔ nneɛma a wɔde kyekyere nneɛma akyi no, wɔde mfiridwuma no nso di dwuma de sesa polymers a ɛtumi sɛe te sɛ polylactic acid (PLA). Nhwehwɛmu ada no adi sɛ corona ayaresa betumi de oxygen akuw a ɛyɛ adwuma aba PLA ani, a ɛnyɛ sɛ ɛma adhesion tu mpɔn nko na mmom ebetumi ama polymer no biodegradation rate nso ayɛ ntɛmntɛm.
Anohyeto ne Mfiridwuma a Ɛboa
Ɛmfa ho sɛ ɛwɔ tumi no, corona ayaresa nyɛ amansan nyinaa ano aduru na ɛwɔ anohyeto pɔtee bi. Plasma a wɔyɛ no sua-density na ayaresa no nkɛntɛnso taa yɛ nea emu nnɔ, ɛhyɛn ade no molecule layers a ɛwɔ akyi paa (nanometers kakraa bi) nkutoo mu. Eyi dɔɔso ma sini nanso ɛbɛyɛ anohyeto ma nneɛma a ɛwɔ afã abiɛsa-, ntama, anaa nneɛma a nhama a ayɛ mmerɛw. Ayaresa nkɛntɛnso no betumi ayɛ nea ɛnyɛ-yɛ pɛ wɔ mmeae a ɛnyɛ pɛpɛɛpɛ, na ahwehwɛde a ɛfa electrode gaps nketewa paa (bɛyɛ mm 1) betumi ayɛ anohyeto a mfaso wɔ so a wɔde sa substrates a ɛyɛ den anaasɛ ɛyɛ textured. Bio nso, ɔfasu a wɔayɛ ho adwuma no betumi anya "onyin," baabi a nkɛntɛnso no so tew bere kɔ so esiane nneɛma a wɔde oxidized a emu duru sua-molecular-mu duru tu anaasɛ polar akuw a wɔsan de kɔ polymer kɛse no mu nti.
Wɔ dwumadie a corona ayaresa ntumi nyɛ adwuma wɔ hɔ no, wɔde mfiridwuma foforɔ ne nea ɛka ho di dwuma.Ogya a wɔde sa yareyɛ wim-nhyɛso kwan foforo a wɔde asi hɔ kɛse. Ɛyɛ adwuma denam plastic no ani a ɛde ma gas ogyaframa bere tiaa bi so, na ɛma ɔfasu no yɛ oxidize denam free-radical afiri a ɛte sɛ corona ayaresa so, na ɛde polar akuw ba. Ogya a wɔde sa yare no nya bun a ɛboro so kakra (4-9 nm) so nkɛntɛnso na wɔtaa pɛ ma nneɛma a ɛyɛ den, 3D nsusuwii a ɛyɛ den te sɛ kar afã horow, anaa nkotoku a wɔde bɔ-nwene. Nhwehwɛmu ada no adi sɛ ɛyɛ mfasoɔ na ɛboa corona discharge, a parameters te sɛ air-to-gas ratio ne exposure time ho hia ma optimization. Sɛ wopɛ sɛ wunya asase ani mfiridwuma a ɛyɛ pɛpɛɛpɛ na ɛkɔ akyiri sen biara a, .low-nhyɛso plasma ayaresade tumi a ɛkorɔn ma. Sɛ wɔde di dwuma wɔ vacuum chamber a ɛwɔ process gas a wɔapaw no pɛpɛɛpɛ (sɛ nhwɛso no, oxygen, argon) mu a, ɛma plasma a ɛyɛ den, ɛyɛ pɛ a ebetumi ayɛ ɔfasu no so dwumadi ahorow pii ne nsakrae a emu dɔ a ɛnsɛe ade kɛse no. Bere a ne bo yɛ den na ɛyɛ batch-oriented no, ɛho hia ma high{5}}tech applications te sɛ aduruyɛ mfiri.
Awiei ne Daakye Ho Nsusuwii
Corona a wɔtow gu ho ayaresa da so ara yɛ mfiridwuma a ɛho hia, a nyansahu-de di dwuma a ɛhyɛɛ plastic ne nneɛma a wɔde kyekyere nneɛma mu nnwuma no nkɔso ase mfe du du pii. Sɛnea wɔde plasma abɔde mu nneɛma ho nimdeɛ di dwuma fɛfɛɛfɛ de siesie ɔhaw ahorow a mfaso wɔ so a ɛfa adhesion ho no yɛ mfiridwuma a etu mpɔn ho adanse. Ɛdenam nsakrae titiriw a ɛsakra plastic ahorow no ani so nnuru denam polar dwumadi akuw a wɔde ba so no, ɛma wotumi yɛ adwuma a nnɛyi nneɛma a wɔde di dwuma hwehwɛ no. Bere a ɛhyia anohyeto ahorow wɔ geometries ne nneɛma bi ho no, ne dwumadi no yɛ nea ahobammɔ wom esiane ne ka-ahoɔhare nsusuwii a ɛso bi nni wɔ sini ayaresa ho nti. Daakye a ɛbɛba wɔ asase ani nsakraeɛ ho no nnyina corona ayaresa a wɔbɛtu akɔ baabi foforɔ no so, na mmom ne nyansa a wɔde bɛka mfiridwuma foforɔ te sɛ ogyaframa ne plasma a nhyɛsoɔ sua-nhyɛ mu.