A cikin bugu na marufi, launin bangon baya galibi ana buga shi da farko don haɓaka babban ingancin kayan ado da kuma biyan ƙarin ƙimar samfurin. A cikin aikace-aikacen aiki, an gano cewa wannan jerin bugu yana da haɗari ga crystallization tawada. Menene dalilin hakan?
1, Domin cimma wani haske da haske bango, da tawada Layer yawanci buga lokacin farin ciki ko reprinted sau ɗaya ko tare da ƙara bugu matsa lamba, da kuma karin busassun man da aka kara a lokacin bugu. Ko da yake Layer ɗin tawada ya rufe gaba ɗaya mai ɗaukar bugawa, saurin bushewa yana haifar da ɗigon fim ɗin tawada mai santsi sosai a saman tawada bayan samuwar fim, yana da wahala a wuce shi da kyau, kamar gilashi. Wannan yana sa tawada da aka buga ba daidai ba ko gaba ɗaya ba zai yiwu a buga shi ba. Tawadan mai da aka buga akan murfin (tari) yana gabatar da ƙirar bugu mai kama da rauni akan launin tushe, kuma haɗin tawada ba shi da kyau, wasu ma ana iya goge su. Masana'antar bugawa tana nufin ta a matsayin crystallization na fim tawada, vitrification, ko madubi.
Domin inganta tsabtar hoto da gefuna na rubutu, yawancin masana'antun sun ƙara man siliki zuwa tsarin tawada a cikin 'yan shekarun nan. Koyaya, yawan man siliki yakan haifar da raguwar fim ɗin tawada a tsaye.
A halin yanzu akwai ra'ayoyi daban-daban daban-daban akan dalilan da ke haifar da crystallization na fina-finai tawada. Bisa ga ka'idar crystallization, crystallization shine tsarin samar da lu'ulu'u daga ruwa (ruwa ko narke) ko yanayin gas. Wani abu wanda solubility ya ragu sosai tare da rage yawan zafin jiki, kuma wanda maganinsa zai iya kaiwa jikewa da crystallize ta hanyar sanyaya; Wani abu wanda raunin sa ya ragu kaɗan tare da raguwar zafin jiki, yana yin crystalliizes lokacin da wasu kaushi ya ƙafe sannan ya huce. Wasu mutane sun yi imani da cewa crystallization na marufi bugu hotuna da kuma rubutu (tawada film Layer) ake kira recrystallization ... The bugu tawada film tsarin da aka kafa ta ƙarfi evaporation (evaporation) sa'an nan sanyaya, kuma aka sani da recrystallization.
2, Wasu mutane yi imani da cewa crystallization (crystallization) na marufi bugu tawada ne yafi lalacewa ta hanyar crystallization na pigments a cikin tawada tsarin.
Mun san cewa lokacin da lu'ulu'u masu launi suna anisotropic, yanayin su na crystalline allura ne ko sanda kamar. Lokacin ƙirƙirar fim ɗin tawada, ana sauƙaƙe jagorar tsayin daka tare da madaidaiciyar hanyar guduro (kayan haɗi) a cikin tsarin, yana haifar da raguwa mai mahimmanci; Duk da haka, babu wani tsari na jagora a lokacin crystallization, yana haifar da ƙananan raguwa. Inorganic pigments a cikin marufi bugu tawada tsarin yawanci suna da lu'ulu'u mai siffar zobe, kamar cadmium tushen marufi bugu tawada, wanda kuma yana da kananan shrinkage (crystallization).
The barbashi size kuma rinjayar gyare-gyare shrinkage kudi da gyare-gyare shrinkage rabo. Lokacin da barbashi na pigment suna da girma ko ƙanana zuwa wani matsayi, ƙimar raguwar gyare-gyare da raguwa shine mafi ƙanƙanta. A gefe guda, resins tare da manyan lu'ulu'u da sifofi masu siffar zobe suna nuna ƙananan gyare-gyaren gyare-gyare, yayin da resins tare da manyan lu'ulu'u da sifofi marasa siffar zobe suna nuna babban shrinkage na gyare-gyare.
A takaice dai, ko da subtractive hadawa na launi pigments ko ƙari hadawa na launi haske, daidai amfani da pigments ba kawai alaka da sinadaran tsarin, amma kuma sun fi mayar dogara a kan jikinsu Properties, kamar crystal barbashi size rarraba. abubuwan da ke haifar da kumburi, ƙwararrun mafita, da sauran abubuwan da ke tasiri; Ya kamata kuma mu yi kyakkyawan kimanta fa'ida da rashin amfani na duka inorganic pigments da na halitta, ta yadda za su kasance tare, kuma na karshen yana rike da matsayi na farko.
Lokacin zabar marufi bugu tawada (pigment), shi ma wajibi ne a yi la'akari da ikon canza launi (mafiner da watsawa, da mafi girma da canza launi ikon, amma akwai iyaka darajar fiye da abin da canza launi ikon zai rage) Rufe ikon (da absorbance halaye). na pigment kanta, da bambanci a refractive index tsakanin pigment da guduro daure da ake bukata don canza launi, girman da pigment barbashi, da crystal nau'i na pigment, da kwayoyin tsarin kwatance na pigment ne mafi girma fiye da na simmetrical. low crystal form).
Ƙarfin rufewa na nau'in crystalline ya fi girma fiye da siffar sanda, kuma ikon rufewa na pigments tare da babban crystallinity ya fi girma fiye da na pigments tare da ƙananan crystallinity. Saboda haka, mafi girman ikon rufewa na marufi bugu tawada tawada fim, mafi kusantar shi ne a samu gilashin gazawar. Ƙunƙarar zafi, juriya na ƙaura, juriya na yanayi, juriya na solubility, da hulɗa tare da polymers (resins a cikin tsarin tawada mai) ko ƙari ba za a iya yin la'akari da shi ba.
3. Wasu masu aiki sunyi imanin cewa zaɓi mara kyau na iya haifar da gazawar crystallization. Domin tushen tawada yana bushewa da ƙarfi (cikakke), yana haifar da raguwar kuzarin da ba shi da ƙarfi. A halin yanzu, idan lokacin adanawa bayan buga launi ɗaya ya yi tsayi sosai, zafin bitar ya yi yawa, ko kuma akwai buƙatun bugu na tawada da yawa, musamman ma'adinan cobalt, idan aka yi amfani da hanyoyin bushewa da sauri da tsauri, kamar bushewa, lamarin crystallization. zai faru.
Lokacin aikawa: Nuwamba-22-2023
