Tomašegović, Tamara (2016) Functional model of photopolymer printing plate production process = Funkcionalni model procesa izrade fotopolimerne tiskovne forme. Dissertation (PhD) thesis. Grafički fakultet. [Mentor: Mahović Poljaček, Sanja].
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Abstract
Analiza utjecaja UVA i UVC post-ekspozicija u procesu izrade fotopolimerne tiskovne forme za fleksotisak u ovom doktorskom radu provedena je pomoću različitih metoda mjerenja i analize. Fotopolimerni uzorci korišteni u ovom istraživanju bili su Computer to Plate (CtP) Laser Ablation Mask Layer (LAMS) tiskovne forme za fleksotisak sa vodenim i solventnim razvijanjem. Analiza njihovih kemijskih, toplinskih, mehaničkih i površinskih svojstava provedena je s ciljem definiranja i kvantificiranja utjecaja procesa post-ekspozicije na tiskovnu formu i otisak dobiven pomoću tiskovnih formi s varijacijama u post-ekspozciji. Kemijske promjene u materijalu uzrokovane UV post-ekspozicijom analizirane su pomoću Fourier transform infracrvene spektroskopije – postupkom prigušene totalne refleksije, energijski razlučujuće/disperzivne rentgenske spektrometrije i metode bubrenja. Toplinska analize (diferencijalna pretražna kalorimetrija i termogravimetrijska analiza) prikazale su utjecaj trajanja UVA i UVC post-ekspozicija na toplinsku stabilnost i razgradnju materijala. Mehanička analiza dala je podatke o promjenama u tvrdoći tiskovne forme tijekom različitih vremena post-ekspozicije. Površinska svojstva fotopolimernog materijala analizirana su pomoću izračuna polarne i disperzne faze slobodne površinske energije te parametra hrapavosti. Dobiveni rezultati su integrirani putem korelacije, kao i robusne metode najmanjih kvadrata i modeliranja neuronskom mrežom kako bi se definirao funkcionalni model procesa izrade tiskovne forme u odnosu na parametre koji utječu na definiciju njenih površinskih svojstava. Otisci dobiveni modificiranim tiskovnim formama pokazali su značajne promjene u debljini nanosa bojila, gustoći zacrnjenja, pokrivenosti površine svjetlih i tamnih tonova te deformaciji tankih linija. Rezultati dobiveni u ovom istraživanju dokazali su da se UVA i UVC post-ekspozicije u procesu izrade tiskovnih formi za fleksotisak mogu koristiti kao jednostavan i brz alat za modifikaciju svojstava njihove površine. Ova modifikacija može se koristiti za prilagodbu površinskih svojstava tiskovne forme specifičnim zahtjevima, odnosno stvaranje “personalizirang” fleksotiskarskog reprodukcijskog sustava za posebne primjene u konvencionalnom i funkcionalnom tisku.
| Item Type: | Dissertation (PhD) thesis |
|---|---|
| Mentor name: | Mahović Poljaček, Sanja |
| Thesis Committee: | Lozo, Branka and Mandić, Lidija and Leskovac, Mirela and Jamnicki, Sonja and Martinez, Sanja |
| Defence date: | 22 March 2016 |
| Abstract in english: | Characterization of the effects of UVA and UVC exposures in the post-treatment process of photopolymer flexographic printing plate production was performed by various measurementand- analysis methods. Samples used in this research were solvent-washable and waterwashable Computer to Plate (CtP), Laser Ablation Mask Layer (LAMS) flexographic printing plates. Analysis of the chemical, thermal, mechanical and surface properties of photopolymer samples was performed in order to define and quantify the influence of the post-treatment process on the properties of printing plates and corresponding prints. Chemical changes in the material were analysed by means of Fourier transform infrared spectroscopy – attenuated total reflectance method, energy dispersive X-ray spectroscopy and swelling experiments. Thermal analysis (differential scanning calorimetry and thermogravimetric analysis) displayed the influence of the duration of post-treatments on the thermal stability and degradation process of the material, as well as the influence on the crosslinking completion. Mechanical analysis provided the information about the changes in hardness of the printing plate due to the posttreatment process. Surface properties of the photopolymer printing plate samples were analysed by calculating the components of surface free energy and roughness parameters. Obtained results were integrated via correlations, as well as least squares fitting and neural network modelling in order to define the functional model of flexographic printing plate production in relation to influencing parameters in the definition of printing plate’s properties in the reproduction process. Prints obtained by UVA and UVC post-treated printing plates displayed significant changes in ink layer thickness and the deformation of fine lines on the prints, as well as the changes in optical density and surface coverage in low and high coverage areas. Results obtained in this research proved that UVA and UVC exposures in the post-treatment process of flexographic printing plate production can be used as a simple and quick tool for modification of the properties of photopolymer material. This modification is useful in adjusting printing plate’s surface and mechanical properties to a specific value, therefore tailoring the flexographic reproduction system for specific applications in conventional and functional printing. |
| Uncontrolled Keywords: | fleksotisak, fotopolimerni materijal, UV post-ekspoziija, umrežavanje, površinska svojstva, funkcionalni tisak |
| Keywords in english: | flexography, photopolymer material, UV post-treatment, crosslinking, surface properties, functional printing |
| Subjects: | TECHNICAL SCIENCES > Graphic Technology |
| Institution: | Grafički fakultet |
| City: | Zagreb |
| Number of Pages: | 232 |
| Callnumber: | 655.2 TOM f |
| Inventory number: | 10140 |
| Depositing User: | Nina Jelača |
| Status: | Unpublished |
| Date Deposited: | 19 Apr 2016 10:30 |
| Last Modified: | 19 Apr 2016 10:30 |
| URI: | http://eprints.grf.unizg.hr/id/eprint/2478 |
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