Ama-Adhesives for Coating Application
Izingubo zokunamathela eziningi zenziwe ngokwezifiso ukuze kuxazululwe izinselele zohlelo lokusebenza ezingenamkhawulo. Uhlobo lwe-coating kanye nezindlela kukhethwa ngokucophelela, ngokuvamile ngokusebenzisa ukuhlolwa okubanzi kanye namaphutha, ukunikeza imiphumela emihle. Ama-coater anolwazi kufanele abhekane nezinhlobonhlobo zokuhlukahluka kanye nezintandokazi zamakhasimende ngaphambi kokukhetha nokuhlola isisombululo. Izingubo zokunamathela zivamile futhi zisetshenziswa emhlabeni wonke ngobuningi bemisebenzi. I-Vinyl ingambozwa ngezinto ezinamathelayo ezizwela ukucindezela ukuze zisetshenziswe kuzimpawu, imidwebo yodonga, noma ukugoqa kokuhlobisa. Ama-Gaskets kanye nama-“O”-rings anganamatheliswa ukuze anamathiselwe unomphela emikhiqizweni nakwimishini ehlukahlukene. Izembatho ezinamathelayo zisetshenziselwa izindwangu kanye nezinto ezingezona ezilukiweyo ukuze zikwazi ukulanywa kuma-substrates aqinile futhi zinikeze ukuthambile, ukuvikela, ukuqeda ukuvikela impahla ngesikhathi sokuthutha.
eziguquguqukayo
Kunezici eziningi eziya ekukhetheni isixazululo esisebenzayo sokunamathela:
Ama-substrates ngokuvamile ayizinto ezifana nephepha, imbobo yodonga, ipulasitiki kathayela, amafilimu namafoyili. Ngayinye inezici zayo ezihlukile ezifana ne-porosity, amandla aqinile kanye nokumelana namakhemikhali.
I-Release Liners isetshenziswa ukuvikela okunamathelayo ekuthinteni nasekungcoleni ngaphambi kokufaka isicelo. Ama-Liners angenziwa ngezinto ezihlukahlukene futhi asebenze ngokubambisana ne-adhesive coating ukuze ulawule amandla e-peel.
Indawo yokufaka isicelo ingaba udonga lukakhonkolo, iphansi elikhaphethi, umnyango wemoto, iwindi, isikhumba somuntu noma ezinye eziningi. Ukwakheka kwalezi zindawo kufanele kucatshangelwe lapho kukhethwa/kuthuthukiswa ikhemistri efanele.
Izimo zemvelo ezifana namazinga okushisa adlulele, umswakama, ukukhanya kwelanga okuqondile noma okungaqondile, ukuchayeka kumakhemikhali, ukusetshenziswa endlini/ngaphandle, njll. kuzoba nomthelela othile ekubambeleleni nasekuqineni.
Izinyathelo eziluhlaza zinganquma ukukhethwa kwe-emulsion-based (amanzi-based) adhesives phezu kwezinto ezincibilikayo (ezisekelwe kumakhemikhali).
Ezinye izici okufanele zicatshangelwe ukuhambisana phakathi kwe-adhesive coat ne-top-coat esebenzayo, uhlobo lwephrinta/uyinki osetshenziswayo, nezimo zokugcina.
Chemistry
Kunezinketho eziningi zamakhemikhali "ezingekho eshalofini" ezitholakala endaweni yemakethe. Kwesinye isikhathi, lawa makhemikhali angasetshenziswa ngaphandle kokuguqulwa. Ezimweni eziningi, zilungiswa ngezithasiselo ukuze kuthuthukiswe ukusebenza kwazo.
Ama-surfactants anciphisa ukungezwani kwendawo ukuze kuthuthukiswe i-rheology ye-adhesive. Lokhu kwenza i-adhesive igeleze kangcono futhi igqoke ngokulinganayo.
Ama-Defoamers angase afakwe ukuze kuncishiswe noma kuqedwe amandla okuba amabhamuza omoya enzeke ngaphakathi kwentolo.
Amaphunga anganezelwa izinhlelo zokusebenza lapho iphunga le-adhesive lihlolisiswa. Imikhiqizo yezimonyo enamathela esikhumbeni ngezinye izikhathi idinga ingcina “enephunga elimnandi”.
izindlela
Kunezinhlobo eziningi zama-coaters nezindlela zokugqoka. Izidingo eziyisisekelo zifaka phakathi ukukhetha i-coater engakwazi ukuthwala usayizi nesisindo sewebhu (umqulu wezinto ezingavuthiwe). Amajazi asezingeni eliphezulu ngokuvamile anesivinini esiphezulu nezilawuli ezicindezelayo ezidingekayo ukuze kuphathwe ama-substrates ahlukahlukene. Ukulawula ukuqina okunembile kubalulekile lapho usebenzisa okokunamathela ezintweni ezizacile njengamafilimu namafoil. Ukukhetha ama-coater kuncike kokungaphezu nje kokulingana ngokomzimba. Izindlela ezihlukene zokumboza zingasatshalaliswa kuye ngomphumela ohlosiwe:
I-Gravure coating isebenzisa amasilinda aqoshiwe afaka inani elithile lokumboza kuwebhu kuye ngevolumu yawo eqoshiwe kanye nezici zoketshezi olunamathelayo. Amasilinda alinganiswa ngocezu lukadokotela oluvumela umsebenzisi ukuthi asebenzise izisindo ezinembe ezinembayo nezingaguquguquki kuwebhu yonkana. Ama-gravure coaters avame ukusetshenziswa kakhulu ukufaka ama-coatings azacile kuwebhu. Ama-Gravure coaters angasetshenziselwa ukumboza okugcwele kwewebhu noma ukumboza iphethini.
I-Reverse roll coating ihlanganisa i-pickup roll ecwiliswe kancane epanini lokumboza. I-coating fluid isetshenziswa ku-pickup roll, yona, isebenzisa ikhemistri kumqulu wofake izicelo. Umqulu wokufaka isicelo usebenzisa uketshezi olunamathelayo kuwebhu. Isisindo sokumboza silawulwa isivinini somqulu kanye negebe phakathi komqulu wofake isicelo kanye ne-pickup roll. Umqulu wesithathu, umqulu oyisipele, ufaka iwebhu kumqulu wokufaka isicelo futhi ulawula ububanzi bokumboza. Le ndlela yokumboza ivame ukusetshenziselwa ukusebenzisa izisindo zokuhlanganisa ezimaphakathi kuya kwezisindayo kuwebhu.
I-deepmaterial coating isebenzisa induku eqoshiwe noma induku yesilonda ukuze isuse ukunamathela okweqile okusetshenziswe kuwebhu ngomqulu wokufaka isicelo noma ngaphandle ngokuqondile epanini. Uma kuqoshwe izikhala ezinkulu noma ezinxeba endukwini, kuba mkhulu noma kusinda kakhulu isisindo sokumboza esisetshenziswa kuwebhu. Lolu hlobo lokugqoka lunikeza ikhono lokwenza ububanzi obuningi bezinsimbi zokugqoka futhi luguquguquka kakhulu uma kuziwa ezicini zamakhemikhali okugcoba asetshenzisiwe.
I-deepmaterial coating ivame ukusetshenziselwa ukufaka i-coating encane kakhulu kuwebhu. I-metered roll isebenzisa i-coating kuwebhu. Izisindo zejazi ngokuvamile zilawulwa isivinini somqulu. Lolu hlobo lokumboza luvame ukusetshenziswa kakhulu ukwengeza umswakama emuva kuwebhu, ikakhulukazi amaphepha, ukulawula ukugoqa komkhiqizo oqediwe.
Ku-Deepmaterial coating, iwebhu inenani eleqile loketshezi olugcotshwayo olusetshenziswa phezulu. Ummese ubekwe ngqo endaweni yewebhu enegebe elithile elingamamitha asuse uketshezi olunamanzi oluningi. Lesi sikhala silawula isisindo sokumboza. Ngendlela efanayo ebizwa ngokuthi i-Air Knife coating, esikhundleni sensimbi noma i-polymer blade, umfudlana ogxilile womoya ogobile usetshenziswa ukuze kukhawulwe uketshezi oluningi olunamathelayo olusuka kuwebhu. Isisindo sejazi silawulwa ngokulungisa isivinini somoya ogobile kanye nebanga legebe lokungena ukusuka kuwebhu.
Indlela ye-Slot Die coating impompa uketshezi olunamathelayo ngegebe elenziwe ngomshini ngokunembile endaweni edayi futhi iye phezulu kuwebhu. Isisindo sokumboza silawulwa ngokushintsha inani lokugeleza ngedayizi noma ukushuba kwegebe kuday. Le ndlela yokugqoka isetshenziswa lapho ukulawulwa kwesisindo esinembile kanye nokuvumelana kuyadingeka.
Ukucwiliswa emanzini ngezinye izikhathi kubizwa ngokuthi "i-dip coating". Iwebhu iyacwiliswa noma icwiliswe epanini noma endaweni yokugcina amanzi equkethe uketshezi olunamanzi. Iwebhu ibe isidluliswa kumaroli amabili anemitha yokumboza ngokweqile kuwebhu. Isisindo sokugqoka silawulwa igebe phakathi kwama-rolls amabili kanye nesivinini sokujikeleza kwemiqulu. Le ndlela yokumboza ivame ukusetshenziswa lapho kudingeka ukugcwaliswa kwekhemikhali yokuhlanganisa kuwebhu.
I-Curtain coating isebenzisa ikhanda elimbozeke ngokunembile elidala ikhethini lekhemistri enamathelayo ewela kuwebhu ehamba ngokuhambisana noketshezi oluwayo. Lolu hlobo lokumboza lusetshenziswa uma kudingeka izisindo ezinembile zokumboza futhi luwusizo nasekufakeni izendlalelo eziningi ezimanzi zoketshezi olunameka kuwebhu. Lokhu kufezwa ngokusebenzisa izikhala eziningi ekhanda elilodwa elinamathelayo, ngayinye enamanzi ahlukene okunamathela ageleza kuwo.
Ukuqeda
Manje njengoba ikhemistri seyenziwe ubunjiniyela futhi nendlela yokumboza ifakwe, ukomisa ingxenye elandelayo yenqubo. Amajazi amaningi anamahhavini angaphakathi aklanyelwe ukomisa noma ukwelapha okunamathelayo. Izinga lokushisa, isivinini kanye nobude be-ovini konke kubalwa lapho kulungiswa inqubo yokomisa. Ukushisa kwe-infrared kusetshenziswa kumahhavini antantayo ukuze kufakwe ngisho ngaphandle kokuxhumana newebhu. Uhlobo lwelayini, into enamathelayo, umswakama kanye nezinga lokushisa elizungezile konke kunomthelela othile enqubweni yokomisa. Izikhathi zokomisa nesivinini kuvame ukulungiswa phakathi nenqubo yesilingo. Izembatho ezinamathelayo ziqale zisetshenziswe kulayini esikhundleni sokuqondile ku-substrate. Le nqubo ibizwa ngokuthi i-transfer coating. Lapho inqubo yokomisa isiqediwe, i-substrate ibe i-laminated ku-adhesive / liner ukukhiqiza umkhiqizo ophelile.
Inqubo yokuthuthukisa ukunamathela okunamathelayo iqala ngomqondo. Ukusuka lapho, kwenziwa i-design-of-experiments (DoE) njengomhlahlandlela obheke empumelelweni. Ngokuvamile, izilingo eziningi ziyadingeka ukuze kuphelele ikhemistri kanye nokusetshenziswa kwaleyo khemistri. Umphumela uyisixazululo esiklanywe kakhulu esiklanyelwe impumelelo.
I-Deepmaterial ikhiqiza ama-coatings akhethekile azosetshenziswa ezinhlelweni zobuchwepheshe ezithuthukile. Amasistimu ethu afaka isivikelo kumswakama, amakhemikhali, imihuzuko, ukugibela ibhayisikili elishisayo, amazinga okushisa aphakeme, ukushaqeka komshini, njll. Asebenza ngo-100% futhi awaqukethe izincibilikisi noma izinyibilikisi. I-Ultra low viscosity coatings iyatholakala ezikhaleni ezivalekile.
