Utjecaj ubrzanog starenja na optičke, mehaničke i površinske karakteristike papira s vlakancima konoplje

master's thesis

• Author: Lahorka Malnar
• Mentor: Vesna Džimbeg Malčić (mentor)
• Committee member: Željka Barbarić - Mikočević (član povjerenstva)
• Committee member: Vesna Džimbeg Malčić (član povjerenstva)
• Committee member: Ivana Plazonić (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2019-1-30, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

Abstract

Industrijski uzgojena konoplja (Cannabis sativa L.) je biljka od koje se dobiva veliki broj korisnih proizvoda, kako u tekstilnoj i prehrambenoj industriji tako i u papirnoj industriji. Kao sirovina za proizvodnju papira konoplja je za eksploataciju spremna u vrlo kratkom vremenskom intervalu uzgoja (nakon 120 dana), za razliku od drveta čiji se period uzgoja do eksploatacije broji u godinama. Papirne tiskovne podloge mijenjaju svoja optička, mehanička i površinska svojstva tijekom starenja. Kako starenje utječe na karakteristike papira ovisi o njegovom sastavu i to prvenstveno o vrsti celuloznih vlakanaca koja su osnovica svakog papira kao tiskovne podloge.

Cilj ovog istraživanja je utvrditi optičke, mehaničke i površinske promjene nakon procesa ubrzanog starenja za tri vrste papira koja sadrže vlakanca konoplje. U tu svrhu, analize su načinjene na dva ručno rađena papira sa 100%-tnim udjelom vlakanaca konoplje od kojih je jedan nebijeljeni, drugi bijeljeni te na jednom industrijski načinjenom papiru s 25%-tnim udjelom vlakanaca konoplje. Sva tri uzorka papira ubrzano su starena standardnim metodama: pod povišenom temperaturom i ksenon lampom. Promjene u optičkoj stabilnosti svih tiskovnih podloga promatrana su prije i nakon tretmana ubrzanih starenja u obliku razlika refleksijskih vrijednosti, Lab vrijednosti i Euklidove razlike boje. Također je utvrđeno kako tretmani ubrzanog starenja djeluju na mehanička i površinska svojstva papira.

Abstract (english)

Industrial cultivated hemp (Cannabis sativa L.) is a plant that can be used to produce large amount of products, both in the textile and food industry as well as in the paper industry. As a raw material for the paper production, hemp have relatively short growing season (120 days), unlike wood whose period of growing up exploitation has in years. Paper printing substrates change their optical, mechanical and surface properties during aging. The effect of aging on the paper characteristics depends on its composition, primarily on the type of cellulose fibers that are the basis of each paper as a printing substrate.

The aim of this study is to determine optical, mechanical and surface changes in three types of paper containing hemp fibers after accelerated aging. For this purpose, the analyzes were made on two hand-made paper with a 100% of hemp fibers, (one unbleached and the other bleached) and one industrial paper with a 25% of hemp fibers. All three paper samples were accelerated by standard methods: increased temperature and xenon lamp. Changes in the optical stability of all paper substrates were observed before and after the treatment of accelerated aging in the form of differences in relative reflection values, Lab values and Euclidean color differences. It has also been found that accelerated aging treatments influence on the mechanical and surface properties of paper.

• Keywords: vlakna konoplje; papir; ubrzano starenje
• Keywords (english): fibers hemp; paper; accelereted aging
• Language: croatian
• URN:NBN: urn:nbn:hr:216:371048
• Study programme: Title: Graphic technology; specializations in: Graphic technology, Design of graphic products; Course: Graphic technology; Study programme type: university; Study level: graduate; Academic / professional title: sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije (sveučilišni/a magistar/magistra inženjer/inženjerka grafičke tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2024-04-18 22:42:15