Izzivi pri tisku ovojnin na flekso tiskarskem stroju

Farčnik, Nina (author), Muck, Deja (mentor)

Številna podjetja se vsakodnevno spopadajo s konkurenco na trgu, zato skušajo embalažo narediti privlačnejšo za kupce. Ker je v želji po dobičku potrebno uspešno krmariti med stroški in kakovostjo, je izbira ustrezne tiskarske tehnike odločilnega pomena za čim višjo dodano vrednost. Tehnika fleksotiska je na trgu konkurenčna predvsem zaradi možnosti tiska na fleksibilno embalažo. Kot eden od pogosto uporabljenih tiskovnih materialov je folija (ovojnina, ovoj za salame) iz različnih polimernih materialov. Podjetja zaradi nižjih stroškov izdelave in normativov spreminjajo izbiro materiala. Zaradi tega lahko pride do opaznih razlik v končnem videzu. V diplomskem delu nas je zanimalo, kako različen tiskovni material vpliva na končno tiskovno kakovost ter ali lahko uporabimo že izdelane tiskovne forme na različnih materialih in s tem prihranimo čas za izdelavo novih form ter se izognemo stroškom, ki bi pri tem nastali. V diplomskem delu smo izmerili barvne razlike izbrane šestbarvne grafike na originalnem in dveh testnih materialih ovojnin. Izmerili smo osnovne in optične lastnosti nepotiskanega materiala in izvedli meritve procesnih barv (CMYK) na potiskanem materialu, ki smo ga odtisnili s testnim oziroma kontrolnim klinom. Dobljene rezultate smo med seboj primerjali in jih opisali v preglednicah. Izvedli smo meritve za dve neprocesni barvi Pantone 116 C in Pantone 7599 C. Na koncu smo izvedli še hitre teste in podali ugotovitve. Pri meritvah barvnih razlik smo ugotovili, da se vzorci med seboj niso bistveno razlikovali. Pri vizualni primerjavi je prišlo do odstopanj pri vzorcu 2 Kalle NaloGrip 55 mat. Barve so bile na pogled blede, lisaste in neprivlačne, zato sklepamo, da material ni primeren za tisk na ovojnino. Poleg tega je dosegel tudi najslabše rezultate pri hitrih testih, zato ga vsekakor ne bi priporočali naročniku. Vzorec 1 Kalle NaloBar 55 sijaj je pri hitrih testih dosegel boljše rezultate od originalnega Podanfol materiala, zato menimo, da je primeren za tisk reprodukcije šestbarvne grafike. Ugotovili smo, da za tisk na testni vzorčni material lahko uporabimo že izdelano tiskovno formo, s tem pa prihranimo čas, ki bi ga potrebovali za izdelavo novih tiskovnih form, in stroške, ki bi pri implementaciji rešitev nastali.

• Language: Slovenian
• Keywords: fleksotisk, ovojnina, tiskovna forma, rastrski oziroma aniloks valj, barvne spremembe
• Work type: Bachelor thesis/paper
• Organization: NTF - Faculty of Natural Sciences and Engineering
• Year: 2021
• PID: 20.500.12556/RUL-129688
• Publication date in RUL: 07.09.2021

Secondary language

• Language: English
• Title: Challenges in printing sausage casing on a flexo printing machine

Abstract

Many companies face competition in the market on a daily basis, so they try to make packaging as attractive as possible to customers. Since in the desire for profit it is necessary to navigate between cost and quality, the choice of the appropriate printing technique is crucial for the highest possible added value. The flexographic printing technique is competitive on the market mainly due to printing on flexible packaging. Foil packaging (salami wrap) made of various polymeric materials, is also used as one of the most frequently used printing materials. Companies are changing the choice of material due to lower manufacturing costs and norms. This can lead to noticeable differences in the final look. In this thesis work we were interested in how different printing material affects the final print quality and if we can use already made printing forms on different materials and save on the time of production of new forms and the costs that arise. In this thesis work, we measured the color differences of the selected six-color graphics on the original and two test packaging materials. We measured the basic and optical properties of the unprinted material and performed measurements of process colors (CMYK) on the printed material, which was preprinted with a tight or control wedge. The obtained results were compared with each other and described in the tables. We made measurements for the two non-process inks Pantone 116 C and Pantone 7599 C. In the end, we did various tests and made findings. When measuring color differences, we found that the patterns did not differ significantly from each other. In the visual comparison, there were deviations in sample 2 Kalle NaloGrip 55 mat. The colors look pale, mottled and unattractive and the material is unsuitable for printing on sausage casing. It also has the worst results in rapid tests and would not be recommended to the client. Sample 1 Kalle NaloBar 55 gloss has better results in quick tests than the original Podanfol material and would be recommended for printing reproductions of six-color graphics. We found that we can use an already made printing form for printing on test sample material. This saved us time and costs in the production of new printing forms.

• Keywords: flexographic printing, packaging, photopolymer plates, raster or anilox roller, color changes