Kuyo yonke inqubo yokukhiqiza yesimanje PCB, uyinki usungomunye wezinto ezisizayo ezibalulekile enqubweni yokukhiqiza ye-PCB yezimboni ze-PCB. Inesikhundla esibaluleke kakhulu ezintweni zenqubo ye-PCB. Impumelelo noma ukwehluleka kokusetshenziswa kwe-inki kuthinta ngqo izidingo zobuchwepheshe eziphelele nezinkomba zekhwalithi zokuthunyelwa kwe-PCB. Ngalesi sizathu, abakhiqizi be-PCB banamathisela ukubaluleka okukhulu ekusebenzeni koyinki. Ngaphezu kwe-viscosity ye-inki eyaziwayo, i-thixotropy njengeyinki ivame ukunganakwa abantu. Kodwa idlala indima ebaluleke kakhulu emphumeleni wokuphrinta kwesikrini.

Ngezansi sihlaziya futhi sihlole umthelela we-thixotropy ohlelweni lwe-PCB ekusebenzeni kweyinki:

I-1. Isikrini

Isikrini sikasilika singenye yezinto ezibalulekile enqubweni yokuphrinta isikrini. Ngaphandle kwesikrini, akukwazi ukubizwa ngokuthi ukuphrinta kwesikrini. Ukuphrinta isikrini kuwumphefumulo wobuchwepheshe bokuphrinta isikrini. Izikrini cishe zonke izindwangu zesilika (impela zikhona nezindwangu ezingezona zikasilika).

Embonini ye-PCB, esetshenziswa kakhulu inethi yohlobo lwe-t. s kanye namanethiwekhi ohlobo lwe-hd ngokuvamile awasetshenziswa ngaphandle kwezidingo ezikhethekile zomuntu ngamunye.

2. Uyinki

Isho into enemibala ye-gelatinous esetshenziselwa amabhodi aphrintiwe. Ivame ukwakhiwa ngama-synthetic resins, ama-solvents aguquguqukayo, amafutha kanye nama-filler, ama-desiccants, ama-pigments kanye nama-diluents. Ngokuvamile okuthiwa uyinki.

Ezintathu. Izakhiwo ezimbalwa ezibalulekile zobuchwepheshe zikayinki we-PCB

Ukuthi izinga likayinki we-PCB lihle kakhulu, empeleni, akunakwenzeka ukuhlukana nenhlanganisela yezingxenye ezinkulu ezingenhla. Izinga elihle kakhulu likayinki liwukubonakaliswa okuphelele kwesayensi, intuthuko kanye nokuvikelwa kwemvelo kwefomula. Kubonakala ku:

(1) I-Viscosity: ifushane nge-viscosity eguqukayo. Ngokuvamile kuvezwa yi-viscosity, okungukuthi, ukucindezelwa kwe-shear kokugeleza koketshezi okuhlukaniswa yi-velocity gradient ekuqondeni kwesendlalelo sokugeleza, iyunithi yamazwe ngamazwe yi-Pa/sec (pa.s) noma i-milliPascal/sec (mpa.s). Ekukhiqizeni kwe-PCB, kubhekiselwa ku-fluidity kayinki okhiqizwa amandla angaphandle.

(2) Ipulasitiki: Ngemva kokuthi uyinki ukhubazeke ngamandla angaphandle, usagcina izakhiwo zawo ngaphambi kokuguqulwa. I-plasticity ye-inki iyasiza ekuthuthukiseni ukunemba kokuphrinta;

(3) Thixotropic: (thixotropic) Uyinki uma ushiywe umile, futhi i-viscosity iyashintsha lapho ithintwa. Kubizwa nangokuthi i-thixotropic kanye ne-sag resistance;

(4) Uketshezi: (ukulinganisa) izinga u-inki osakazeka ngalo nxazonke ngaphansi kwesenzo samandla angaphandle. I-Fluidity iwukuphindaphinda kwe-viscosity, futhi uketshezi luhlobene nepulasitiki kanye ne-thixotropy kayinki. I-plasticity ne-thixotropy inkulu, i-fluidity inkulu; i-fluidity inkulu, ukuphrinta kulula ukwandisa. Nge-fluidity ephansi, ijwayele ukwakheka kwenethiwekhi, okuholela ekwakhekeni kwe-inki, eyaziwa nangokuthi i-reticulation;

(5) I-Viscoelasticity: isho ikhono likayinki eligundwayo futhi eliphukile ngemva kokuthi u-inki esulwe umcibisholo ukuze aphinde abophe ngokushesha. Kudingeka ukuthi isivinini se-inki sokuguquguquka sisheshe futhi uyinki uphinde ubuyele ngokushesha ukuze ube nenzuzo ekuphrinteni;

(6) Ukoma: lapho uyinki ukoma kancane esikrinini, kuba ngcono, futhi ngokushesha kuba ngcono ngemva kokuba uyinki udluliselwe ku-substrate;

(7) Ubuhle: ubukhulu bombala kanye nezinhlayiya eziqinile, uyinki we-PCB ngokuvamile ungaphansi kuka-10μm, futhi usayizi we-fineness kufanele ube ngaphansi kwengxenye eyodwa kwezintathu yokuvuleka kwezikhala;

(8) Ukuqina: Uma uyinki uthathwa ngefosholo uyinki, izinga u-inki ofana nosilika onganqamuki kulo lapho weluliwe libizwa ngokuthi intambo. Umcu we-inki mude, futhi kunemicu eminingi endaweni eyinki nasendaweni yokunyathelisa, okwenza i-substrate nepuleti lokunyathelisa libe ngcolile, noma ngisho lingakwazi ukuphrinta;

(9) Ukukhanyela namandla okufihla kayinki: Koyinki be-PCB, izidingo ezihlukahlukene zibekwa phambili ukuze kukhanye futhi kufihle amandla kayinki ngokuya ngokusetshenziswa nezimfuneko ezihlukahlukene. Ngokuvamile, oyinki besekethe, oyinki abaqhubayo kanye noyinki bezinhlamvu konke kudinga amandla aphezulu okufihla. Ukumelana ne-solder kuyavumelana nezimo.

(10) Ukumelana namakhemikhali kayinki: Uyinki we-PCB unezindinganiso eziqinile ze-asidi, i-alkali, usawoti kanye ne-solvent ngokwezinjongo ezahlukene;

(11) Ukumelana nomzimba kukayinki: Uyinki we-PCB kufanele uhlangabezane nokumelana nokuklwebheka kwangaphandle, ukumelana nokushaqeka okushisayo, ukumelana nekhasi lomshini, futhi kuhlangatshezwane nezidingo ezihlukahlukene eziqinile zokusebenza kukagesi;

(12) Ukuphepha nokuvikelwa kwemvelo kukayinki: Uyinki we-PCB udingeka ukuthi ube nobuthi obuphansi, ungabi nephunga, uphephe futhi ungabi nemvelo.

Ngenhla sifingqe izakhiwo eziyisisekelo zoyinki be-PCB abayishumi nambili. Phakathi kwabo, ekusebenzeni kwangempela kokunyathelisa kwesikrini, inkinga ye-viscosity ihlobene eduze no-opharetha. I-viscosity ibaluleke kakhulu ekusheleleni kwesikrini sikasilika. Ngakho-ke, kumadokhumenti kayinki we-PCB kanye nemibiko ye-qc, i-viscosity imakwe ngokucacile, ikhombisa ngaphansi kwaziphi izimo nokuthi hlobo luni lwethuluzi lokuhlola i-viscosity okufanele lusetshenziswe. Enqubweni yokuphrinta yangempela, uma i-viscosity ye-inki iphezulu kakhulu, kuyoba nzima ukuyiphrinta, futhi imiphetho yehluzo izoba nzima kakhulu. Ukuze kuthuthukiswe umphumela wokuphrinta, kuzongezwa umncane ukuze enze i-viscosity ihlangabezane nezidingo. Kodwa akunzima ukuthola ukuthi ezimweni eziningi, ukuze uthole isixazululo esifanele (isinqumo), kungakhathaliseki ukuthi i-viscosity oyisebenzisayo, kusengenzeka yini ukufeza. Kungani? Ngemva kokucwaninga okujulile, ngathola ukuthi i-viscosity ye-inki iyisici esibalulekile, kodwa hhayi kuphela. Kunesinye isici esibaluleke kakhulu: i-thixotropy. Kuphinde kuthinte ukunemba kokuphrinta.

Ezine. Thixotropy

I-viscosity kanye ne-thixotropy yimibono emibili ehlukene yomzimba. Kungaqondwa ukuthi i-thixotropy iwuphawu lwezinguquko ku-viscosity ye-inki.

Uma uyinki usezingeni lokushisa elithile elingapheli, kucatshangwa ukuthi i-solvent kuyinki ayishintshi ngokushesha, i-viscosity ye-inki ngeke ishintshe ngalesi sikhathi. I-viscosity ayihlangene nesikhathi. I-viscosity ayiyona into eguquguqukayo, kodwa ihlala njalo.

Lapho uyinki ingaphansi kwamandla angaphandle (ukunyakazisa), i-viscosity iyashintsha. Njengoba amandla eqhubeka, i-viscosity izoqhubeka nokuncipha, kodwa ngeke yehle ngokungapheli, futhi ime lapho ifinyelela umkhawulo othile. Lapho amandla angaphandle enyamalala, ngemva kwesikhathi esithile sokuma, uyinki ungabuyela kancane kancane esimweni sokuqala. Sibiza lolu hlobo lwempahla ebonakalayo ebuyiselwayo ukuthi i-viscosity kayinki iyancipha ngokunwetshwa kwesikhathi ngaphansi kwesenzo samandla angaphandle, kodwa ngemva kokunyamalala kwamandla angaphandle, ingabuyela ku-viscosity yasekuqaleni njenge-thixotropy. Thixotropy ukuguquguquka okuhlobene nesikhathi ngaphansi kwesenzo samandla angaphandle.

Ngaphansi kwesenzo samandla angaphandle, isikhathi esifushane samandla, nokuncipha okusobala kwe-viscosity, sibiza le inki ngokuthi i-thixotropy inkulu; ngokuphambene nalokho, uma ukwehla kwe-viscosity kungabonakali, kuthiwa i-thixotropy incane.

5. Indlela yokusabela kanye nokulawulwa kwe-ink thixotropy

Iyini ngempela i-thixotropy? Kungani i-viscosity yeyinki iyancipha ngaphansi kwesenzo samandla angaphandle, kodwa amandla angaphandle ayanyamalala, ngemva kwesikhathi esithile, i-viscosity yasekuqaleni ingabuyiselwa?

Ukuze unqume ukuthi uyinki unezimo ezidingekayo ze-thixotropy, okokuqala yi-resin ene-viscosity, bese igcwaliswa ngesilinganiso esithile sevolumu yokugcwalisa kanye nezinhlayiya ze-pigment. Ngemuva kokuthi i-resin, izigcwalisi, izingulube, izithasiselo, njll zigaywe futhi zicutshungulwe, zixubene kakhulu ngokulinganayo. Bayingxube. Uma kungekho ukushisa kwangaphandle noma amandla okukhanya kwe-ultraviolet, zikhona njengeqembu le-ion elingavamile. Ngaphansi kwezimo ezijwayelekile, zihlelwe ngendlela ehlelekile ngenxa yokukhangana, okubonisa isimo se-viscosity ephezulu, kodwa akukho ukusabela kwamakhemikhali okwenzekayo. Futhi uma ingaphansi kwamandla omshini wangaphandle, ukuhlelwa kokuhleleka kwasekuqaleni kuyaphazamiseka, iketango lokukhangana elihlangene liyanqanyulwa, futhi libe isimo esiphazamisekile, okubonisa ukuthi i-viscosity iba ngaphansi. Lesi yisimo esivame ukuyibona ngoyinki ukusuka kokuwugqinsi kuya omncane. Singasebenzisa lo mdwebo olandelayo ovaliwe wenqubo ehlehliswayo ukuze siveze ngokusobala yonke inqubo ye-thixotropy.

Akunzima ukuthola ukuthi inani lezinto eziqinile kuyinki kanye nokuma nobukhulu bezinsimbi kuzonquma izakhiwo ze-thixotropic zikayinki. Yiqiniso, ayikho i-thixotropy yoketshezi olungokwemvelo oluphansi kakhulu nge-viscosity. Kodwa-ke, ukuze ukwenze ube uyinki we-thixotropic, kungenzeka ngokobuchwepheshe ukwengeza i-ejenti eyisizayo ukuze ushintshe futhi ukwandise i-viscosity ye-inki, okwenza kube thixotropic. Lesi sengezo sibizwa ngokuthi i-ejenti ye-thixotropic. Ngakho-ke, i-thixotropy yeyinki iyalawuleka.

Eziyisithupha. Isicelo esiwusizo se-thixotropy

Ekusetshenzisweni okungokoqobo, akukhona ukuthi i-thixotropy enkulu, engcono, noma encane engcono kakhulu. Kwanele nje. Ngenxa yezakhiwo zayo ze-thixotropic, uyinki ifaneleka kakhulu inqubo yokuphrinta isikrini. Yenza umsebenzi wokuphrinta isikrini ube lula futhi ube mahhala. Ngesikhathi sokunyathelisa kwesikrini se-inki, uyinki enetheni uphushwa yi-squeegee, ukugoqa nokucindezela kwenzeka, futhi i-viscosity ye-inki iba ngaphansi, okuvumela ukungena kwe-inkino. Ngemva kokuthi uyinki ephrintiwe ku-substrate ye-PCB, ngenxa yokuthi i-viscosity ayikwazi ukutholwa ngokushesha, kunesikhala sokulinganisa esifanele ukwenza uyinki ugeleze kancane, futhi lapho ibhalansi ibuyiselwa, imiphetho yesikrini esiphrintiwe ihluzo zizothola ukugculisa. ukucaba.