Proizvodnja i svojstva bezdrvnih papira

undergraduate thesis

• Author: Lea Pavlic
• Mentor: Maja Strižić Jakovljević (mentor)
• Committee member: Branka Lozo (predsjednik povjerenstva)
• Committee member: Maja Strižić Jakovljević (član povjerenstva)
• Committee member: Sonja Jamnicki Hanzer (član povjerenstva)
• Granter: University of Zagreb; Faculty of Graphic Arts; Zagreb
• Defense date and country: 2023-09-18, Croatia
• Scientific / art field, discipline and subdiscipline: TECHNICAL SCIENCES; Graphic Technology

Abstract

Bezdrvni papiri jedni su od najkvalitetnijih papira. Bezdrvni papiri dijele se na
bezdrvne premazane papire i bezdrvne nepremazane papire. Bezdrvni papiri ne nose takav
naziv jer ne sadrže drvo, već im je određenim postupcima uklonjen lignin. Lignin je glavni
sastojak drva te ga on čini čvrstim i krutim te drvo zbog njega ne trune tako lako. Jače grane
mogu držati veće plodove bez pucanja. Održava biljke uspravnim u nepovoljnim uvjetima.
Lignin također pomaže zaštititi drvo od štetnika i drugih oštećenja Međutim lignin loše utječe
na svojstva papira. Papir požuti s vremenom jer dolazi do oksidacije odnosno jer se molekule
lignina počinju mijenjati i postaju nestabline. Također čini papir manje čvrstim. Iz tog razloga
lignin se mora ukloniti iz drvne kaše. Dva najpoznatija procesa izdvajanja lignina iz drvne
mase su sulfatni proces koji je lužnati postupak i sulfitni proces koji je kiseli postupak.
Spomenuti procesi proizvodnje papira će se opisati, usporediti, te će se izdvojiti osnovne
karakteristike svakog procesa pojedinačno.

Abstract (english)

Wood-free papers are one of the highest quality papers, which are divided into wood-free
coated papers and wood-free uncoated papers. They do not bear such a name because they do
not contain wood, but it is because their lignin has been removed by certain procedures. Lignin is the main component of wood, and it makes it strong and rigid, and because of it, the
wood does not splinter so easily. Stronger branches can hold larger fruits without breaking
which keeps plants upright in adverse conditions. Lignin also helps protect wood from pests
and other damage. However, lignin has a bad effect on paper properties. Paper turns yellow
over time because oxidation occurs, or because lignin molecules begin to change and become
unstable. It also makes the paper less stiff. For this reason, lignin must be removed from wood
pulp. The two most well-known processes for extracting lignin from wood pulp are the sulfate
process, which is an alkaline process, and the sulfite process, which is an acid process. The
mentioned processes of paper production will be described, compared, and the basic characteristics of each process will be singled out.

• Keywords: bezdrvni papiri; lignin; sulfatni postupak; sulfitni postupak; papir
• Keywords (english): wood-free papers; lignin; sulfate process; sulfite process; paper
• Language: croatian
• URN:NBN: urn:nbn:hr:216:813502
• Study programme: Title: Graphic technology; specializations in: Technical – technological, Design of graphic products; Course: Technical – technological; Study programme type: university; Study level: undergraduate; Academic / professional title: sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka grafičke tehnologije (sveučilišni/a prvostupnik/prvostupnica (baccalaureus/baccalaurea) inženjer/inženjerka grafičke tehnologije)
• Type of resource: Text
• File origin: Born digital
• Access conditions: Open access
• Created on: 2025-01-16 12:14:20