Layini z’okusiiga okufulumya zibeera oba zifa ku nnamba emu: amaanyi g’okusekula wakati wa polimeeri esaanuuse ne substrate. Extrusion coating adhesion esalibwawo mu ddirisa lya sekondi ntono wakati wa treater station ne nip, era tewali bungi bwa downstream tuning esobola kutaasa web eyayingira mu die n’amasoboza amakyamu ag’okungulu. Ekitabo kino kikwata ku nteekateeka z’obujjanjabi, enneeyisa ya substrate n’enkyukakyuka za layini ezituusa mu ngeri eyesigika enkolagana ez’amaanyi, eziddibwamu ku kusiiga okufulumya, lamination y’okufulumya ne layini za tandem.
Lwaki Extrusion Coating Adhesion Kizibu ky’amasoboza ag’okungulu
Polyethylene asaanuuse ava mu die ku diguli nga 300 n’atuuka ku nip mu sikonda emu oba bbiri. Mu ddirisa eryo lirina okufukirira ddala substrate n’okukola enkolagana ez’okubiri okubuna ensengekera. Okufukirira kubaawo nga amasoboza ag’okungulu ga substrate gasukka okusika kw’okungulu kw’ekisengejjero, nga ku LDPE kuba nga 31 dynes buli sentimita ate ku copolymers nga EAA eyinza okuba wansi.
Firimu ya polyolefin etalongooseddwa etuula ku dynes 29 ku 31, ku nsalo yennyini. Eno y’ensonga lwaki extrusion coating adhesion eremererwa ku stock etalongooseddwa era y’ensonga lwaki corona treatment ya standard ku buli extrusion coating line. Obujjanjabi busitula kungulu okutuuka ku dayini 38 ku 42 era ekisinga obukulu, buleeta ebibinja ebikola eby’enjuba (polar functional groups) ebikola enkolagana ya kemiko eya nnamaddala n’ekisengejjero, so si kukwatagana kwa van der Waals kwokka.
Ekitegeeza mu nkola kiri nti tosobola kusalawo kwetegefu okusinziira ku ddaala lya dyne lyokka. Surface esoma dynes 40 olw’obucaafu-driven roughness yeeyisa mu ngeri ya njawulo ku eyo esoma dynes 40 olw’okuwunyiriza okwa nnamaddala. Obuggya bukulu: ebifo ebirongooseddwa bikaddiwa, era okunywerera kw’ekizigo ekifulumizibwa (extrusion coating adhesion) kukendeera mu ngeri epimibwa ng’ekituli wakati w’okujjanjaba n’oku nip kisusse sekondi ntono naddala ku nnaku ez’ebbugumu n’obunnyogovu.
Okuteeka Corona Power ku Extrusion Okusiiga Adhesion
Watt density ye nkyukakyuka efuga, eraga nga watts buli square centimeter buli ddakiika ya surface erongooseddwa. Ku kusiiga okufulumya polyolefin ku firimu oba foil, bbandi etandika eya 6 ku 12 W/cm2/min ebikka layini ezisinga obungi ez’okufulumya.
Kibaze butereevu: density ya watt yenkana amaanyi gonna agakozesebwa nga gagabanyizibwamu ekibala ky’obugazi bw’omukutu n’embiro za layini. Layini ey’obugazi bwa mmita 1.6 ng’edduka ku sipiidi ya mmita 200/eddakiika ng’okozesa kW 20 evaamu nga 6.3 W/cm2/min. Sipiidi ekubisaamu emirundi ebiri ku bugazi obutakyukakyuka era olina okukubisaamu emirundi ebiri amaanyi okusobola okukwata omutindo gw’obujjanjabi gwe gumu.
Emitego ebiri gikwata abaddukanya emirimu enfunda eziwera. Ekisooka, okusitula amaanyi okusukka ensonga y’okukendeera kw’okuddizibwa kwokya kungulu, kutondawo ebisasiro eby’obuzito obutono-molekyulu-era mu butuufu kinafuya okunywerera kw’okusiiga kw’okufulumya nga kulekawo oluwuzi lw’ensalo enafu. Ekyokubiri, okudduka amaanyi matono ennyo okusobola okukekkereza amaanyi kivaamu ekifo ekigezesa obulungi amangu ddala naye ne kiremererwa oluvannyuma lw’okukaddiwa.
Tune ng’opima amaanyi g’ebikuta, so si ng’ogoba nnamba ya dayini. Yongera amaanyi mu mitendera 10 ku buli 100 okutuusa ng’amaanyi g’okusekula gatuuse ku plateaus, olwo odde emabega ku setting esinga wansi ekyali egaba margin eyeeyagaza. Eyo y’ensonga yo ey’okufulumya (production set point).
Okukwataganya Obujjanjabi ku Substrate
Buli substrate yeeyisa mu ngeri ya njawulo, era settings ezikola ku emu zijja kulemererwa ku ndala.
LDPE ne firimu ya LLDPE.Omusango gwa classic. Yeetaaga okujjanjabwa mu bujjuvu okutuuka ku dynes 38 ku 42. Laba obujjanjabi bw’omugongo ku firimu eziri wansi wa microns 25, ekivaako okuzibikira ku unwind.
BOPP.Obuziba bwa kirisitaalo obusingako kitegeeza nti obujjanjabi butuula okumpi n’engulu era bukaddiwa mpola. Ebigendererwa bya dynes 38 ku 40 bitera okumala, naye extrusion coating adhesion ekwata ku slip additives ezisenguka ku ngulu ne zitaataaganya okukwatagana.
EKISOLO.Etandika okwetoloola dynes 41 nga tezirongooseddwa era yeetaaga okuyita kw’ekitangaala kwokka okutuuka ku 45 ku 48. Okujjanjaba okusukkiridde-kabi ka ddala wano kubanga kungulu kuyinza okufuuka pawuda.
Ekipande kya aluminiyamu.Conductive, kale discharge yeeyisa mu ngeri ya njawulo era roll covering erina okukwata omugugu gw’ebbugumu ogw’amaanyi. Layer za oxide ku foil zikwatagana mu kemiko n’ebibinja by’enjuba, y’ensonga lwaki okunywerera kw’okusiiga okw’okufulumya ku foyili kutera okuba okulungi ennyo oluvannyuma lw’okujjanjaba okutuufu.
Olupapula n’olubaawo.Ebituli n’obunnyogovu. Target dynes 40 ku 44, kuuma density ya watt nga ya kigero, era fuga obunnyogovu, okuva omukka gw’amazzi mu bbanga bwe gunyigiriza okufuluma.
Substrates ezisiigiddwa n’ebyuma.Bino byetaaga obujjanjabi obugonvu, obufugibwa obulungi- kubanga oluwuzi olukola lugonvu. Okukendeeza ku nkola y’emirimu oba ekyuma ekirongoosa pulasima mu bbanga ekifugibwa-kitera okuba eky’okuddamu ekirungi okusinga okuyita kwa corona enzito.
Enkyukakyuka za Layini Ezikyusa Extrusion Coating Adhesion
Obujjanjabi buba kimu kyokka ekiyingizibwa. Enkyukakyuka za layini eziwerako zikyusa ekivaamu era zirina okuddukanyizibwa wamu.
Ebiseera wakati w’obujjanjabi ne nip.Eno y’enkyukakyuka esinga okunyoomebwa. Ekkubo likuume nga limpi nga bwe kisoboka mu byuma. Buli sikonda ey’okwongerako ey’okubikkulwa efiiriza ebibinja by’enjuba (polar groups) nga bwe biddamu okutunula mu kitundu ekinene.
Ebbugumu ly’omukutu.Obulung’amu bw’obujjanjabi bulongooka ku mutimbagano ogubuguma, era okunyweza kuganyulwa mu substrate eyokya ku nip. Okwawukana ku ekyo, okubuguma okuyitiridde nga tekunnabaawo kugoba ebibinja ebipya ebitondeddwawo.
Ozone n’okugiggyamu.Ozone kiva mu kulongoosa by-ekintu, so si kulongoosa kwennyini, naye era avunda. Okuggyamu okumala kukuuma ebyuma era kukuuma empewo y’ekituli nga tekyukakyuka, ekitebenkeza extrusion coating adhesion run okudduka.
Puleesa ya nip n’okubeera.Puleesa eya waggulu evuga ekisaanuuse mu micro-porosity ey’okungulu era n’erongoosa okusumulula kw’ebyuma. Kino kijjuliza okukwatagana kw’eddagala okuva mu bujjanjabi okusinga okukikyusa.
Die n'empewo gap.Okisayidi y’ekisaanuuse mu bbanga ly’empewo kitondeka ebibinja by’enjuba (polar groups) ku ludda lwa polimeeri. Ekituli ky’empewo ekiwanvu kyongera ku oxidation y’okusaanuuka era kisobola okusasula ekitundu ku nkola ya substrate enafu - naye era kiri mu kabi obutabeera mu ntebenkevu ku mbiriizi n’ensingo-mu.
Chill roll okumaliriza.Matte chill roll ekyusa roughness ku coating surface, ekitakosa maanyi ga bond naye kikosa downstream print ne lamination performance.
| Substrate | Dyne ekigendererwa | Obuzito bwa watt (W/cm2/min) . | Akabi akakulu |
|---|---|---|---|
| Firimu ya LDPE | 38–42 | 6–10 | Obujjanjabi bw’omugongo |
| Firimu ya LLDPE | 38–42 | 8–12 | Okukaddiwa nga tonnaba nip |
| BOPP | 38–40 | 5–8 | Slip additive okusenguka |
| EKISOLO | 45–48 | 3–6 | Okujjanjaba okusukka-, okukola pawuda |
| Ekipande kya aluminiyamu | 42–46 | 6–12 | Roll omugugu gw’ebbugumu |
| Olupapula / olubaawo | 40–44 | 4–8 | Obunnyogovu mu bbanga |
| Firimu eriko ebyuma | 44–50 | 3–5 | Okwonooneka ku layeri y’ekyuma |
Okupima n’okukakasa Extrusion Coating Adhesion
Okwetaaga enkola bbiri ez’okupima: emu ya kungulu, endala ya bond.
Ku ngulu, dyne pens oba test inks ziwa fast go/no-go read. Zikozese wakati n’empenda zombi, amangu ddala ng’omaze okuzijjanjaba ate n’oddamu nga tonnaba kukola nip singa ekkubo liba ddene. Wandiika emiwendo; omuze oguwuguka gukugamba nti electrode oba dielectric yeetaaga okufaayo.
Ku bond, kozesa okugezesebwa kwa T-peel ku sampuli ewonye. Amangu ddala oluvannyuma lw’okusiiga okufulumya, okunyweza kukyakula, kale okugezesebwa okuggyibwa butereevu ku layini kusukkiridde oba okunyooma omuwendo ogusembayo okusinziira ku polimeeri. Enkola eya bulijjo kwe kulongoosa sampuli okumala essaawa 24 nga tebannaba kukeberebwa.
Olondoola amaanyi g’ebikuta okusinziira ku bifo ebiteekeddwawo obujjanjabi mu log ennyangu. Bwe extrusion coating adhesion drifts, log ekubuulira oba obujjanjabi, substrate lot oba line speed kyakyuka, era ekyo kisala ku diagnosis time dramaticly.
Ensobi eza bulijjo Ezoonoona Extrusion Coating Adhesion
- Okujjanjaba ewala ennyo waggulu w’omugga.Ekkubo eddene wakati w’omujjanjabi n’ekifa lireka kungulu okuwummulamu. Tambuza siteegi okumpi oba okulinnyisa density ya watt okuliyirira, naye tomala gakkiriza kufiirwa.
- Okujjanjaba okusukka-.Amaanyi ga cranking "okubeera safe" gakola ensalosalo enafu layer ya oxidised ebisasiro era okukendeeza extrusion coating adhesion. Ebisingawo si bisingako.
- Okugezesa wakati w’omukutu gwokka.Edge adhesion esooka kulemererwa era eraga okwambala kwa electrode oba dielectric.
- Okubuusa amaaso obunnyogovu.Obunnyogovu obw’amaanyi mu kifo kino bunyigiriza okufuluma ne buyingiza amazzi mu bbanga. Ennongoosereza z’ensonga eziteekeddwawo-eza sizoni za bulijjo mu bimera eby’omu bitundu eby’obutiti.
- Okukozesa ekibikka ku muzingo ekikyamu.Omuzingo ogubikkiddwa silikoni- oguddukira ku density ya watt enkulu gukulaakulanya emitendera egy’okutambuza era guwa obujjanjabi obutali bwenkanya, kale okunywerera kw’okusiiga okw’okufulumya kwawukana mu bugazi.
- Obutakebera reference etajjanjabiddwa.Bulijjo kuuma sampuli y’okufuga eya substrate y’emu nga tolina bujjanjabi okukakasa nti omujjanjabi ddala akola omulimu.
Ebibuuzo ebibuuzibwa
Q1: Dyne level ki gye nneetaaga okusobola okunyweza obulungi extrusion coating?
Ku substrates za polyolefin, genderera dynes 38 ku 42 buli centimeter ku point ya nip, so si ku treater exit. Ku PET ne foil, dynes 45 ze zisinga okunyuma. Bulijjo kakasa n’okukebera ebikuta, okuva dyne level bweri proxy, so si kiruubirirwa.
Q2: Nsobola okufuna strong extrusion coating adhesion nga sirina bujjanjabi bwa corona?
Ne substrates zokka ezitwala edda kemiko w’enjuba, gamba ng’empapula ezimu ezisiigiddwa oba firimu ezisooka-primed. Ku polyolefins ezitali za primed, surfaces ezitalongooseddwa teziyinza kufukibwa mu ngeri eyesigika olw’okusaanuuka, era okunywerera kujja kulemererwa wansi w’okunyigirizibwa kwonna okw’ebyuma oba okw’ebbugumu.
Q3: Obujjanjabi buvunda mangu gatya nga tebannaba kusiiga kufulumya?
Okuvunda kisinziira ku bbugumu, obunnyogovu ne substrate. Mu mbeera ennyogovu era enkalu omukutu ogulongooseddwa gusobola okukwata ekitundu ekisinga obunene eky’omutindo gwagwo ogwa dayini okumala ennaku. Ku layini y’okusiiga okufulumya okw’ebbugumu, ennyogovu okufiirwa mu sikonda ntono ez’okutambula kuyinza okuba dynes eziwerako, kale ekkubo erijjanjabiddwa likuume nga limpi.
Q4: Sipiidi ya layini esingako erumya okusiiga kw’okusiiga okufulumya?
Si singa watt density ekuumibwa nga tekyukakyuka. Sipiidi ekendeeza ku budde bw’okubeera mu discharge, kale olina okwongera ku maanyi mu kigerageranyo. Awali ekijjanjabi ku silingi yaakyo ey’amaanyi, sipiidi efuuka ekiziyiza okusiba era olina okukendeeza ku sipiidi oba okukkiriza obujjanjabi obwa wansi.
Q5: Lwaki extrusion coating adhesion yawukana okuva ku roll okudda ku roll?
Ebitera okuvaako bye bino: enkyukakyuka mu kitundu kya substrate, enkyukakyuka mu anti-block oba slip additive loading, drift mu electrode gap, dielectric wear, n’obunnyogovu bw’ekifo. Ebivaamu ebikuta by’ebikondo okusinziira ku nnamba ya substrate lot okwawula ensibuko.
Q6: Ozone ya bulabe eri okukwatagana kw’ekizigo kya extrusion?
Ozone yennyini si ya bulabe eri ekiyungo, naye ozone atafugibwa eraga okuggyamu okutakwatagana, ekikyusa empewo y’ekituli n’olwekyo okufuluma. Ozone omungi era avunda ebitundu by’ebyuma ebiriraanyewo era bikaddiwa ebibikka ku mizingo gya kapiira.
Q7: Nkola ku njuyi zombi eza substrate?
Laba oludda olufuna ekizigo. Okujjanjaba enjuyi zombi oluusi n’oluusi kukozesebwa okufuga curl oba okuteekateeka ffeesi ey’emabega okukola enkola eddako, naye kikubisaamu emirundi ebiri omugugu gw’ebbugumu era kyongera ku bulabe bw’okuzibikira ku unwind.
Mu bufunzi
Extrusion coating adhesion is a process outcome, so si material property, era ensengeka z’obujjanjabi ze lever esinga obunene gy’ofuga. Teeka watt density okuva ku substrate ne line speed, kakasa n’okugezesa okusekula ku conditioned samples, kuuma ekkubo erirongooseddwa nga limpi, era log ebivuddemu olwo drift erabika nga bukyali.
Shenzhen Hefeng Jiada Technology egaba ebyuma ebijjanjaba corona, ebyuma ebirongoosa plasma n’ebyuma ebiyonja omukutu ogukwatagana ebikoleddwa yinginiya okukola layini z’okusiiga okufulumya n’okusiiga lamination. Gabana substrate yo, obugazi bwa layini, sipiidi n’amaanyi g’ekikuta ky’ekigendererwa, era bayinginiya baffe bajja ku sayizi y’ekifo eky’okujjanjaba era bakuwa amagezi ku nteekateeka ezikwata extrusion coating adhesion run after run.