Kakovost meljavine in vpliv na lastnosti kartona in papirja

diplomsko delo

Miroslav Mališ (Author), Marko Petrič (Reviewer), Vesna Tišler (Mentor), Vera Rutar (Co-mentor)

Abstract

Fizikalno mehanske lastnosti vlaknine se z mehansko obdelavo spreminjajo. Če vlaknina ni mleta, ima list, izdelan iz takšne vlaknine, zelo slabe mehanske lastnosti. To velja tudi za papir, katerega vlaknine smo le malo mleli. Z napredujočim časom mletja raste stopnja mletja. Istočasno tudi mehanske lastnosti rastejo do določene maksimalne vrednosti, nato pričnejo upadati. Krivulja rasti mletja kot tudi mehanskih lastnosti je odvisna od vrste in kakovosti vlaknine. če hočemo določiti kakovost vlaknine, moramo le-to podvreči laboratorijskemu mletju na standardiziranih mlelnih aparatih pri standardiziranih pogojih. S standardiziranimi metodami določimo tudi fizikalno mehanske lastnosti vlaken. Oboje je predpogoj, da rezultate, dobljene pri analizi iste ali različne vlaknine, medsebojno primerjamo.

Keywords

les;vlakna;meljavina;mletje;papir;mehanske lastnosti;

Data

Language:	Slovenian
Year of publishing:	2008
Source:	Ljubljana
Typology:	2.11 - Undergraduate Thesis
Organization:	UL BF - Biotechnical Faculty
Publisher:	[M. Mališ]
UDC:	630*861
COBISS:	1648777
Views:	1304
Downloads:	333
Average score:	0 (0 votes)
Metadata:

Other data

Secondary language:	English
Secondary title:	Quality of pulp and its influence on characteristics of paperboard and paper
Secondary abstract:	Mechanical treatment changes physically-mechanical characteristics of fibrin. The paper made from fibrin, which is not ground, has very bad mechanical characteristics. These apply also to papers, made of fibrin, which is only less ground. The degree of grinding grows parallelly to increasing time of grinding. At the same time, mechanical characteristics also grow to a certain maximum value, then they start to decrease. Curve of grinding growth, so as that of mechanical characteristics, depends on kind and qualities of fibrin. To define the quality of fibrin it must be subjected to laboratorial grinding using standard grind machines at standard conditions. Physically-mechanical characteristics of fibrin are to be defined with standard procedures as well. They both are prerequisite for the results gained by analysing the same or a different fibrin are mutually compared.
Secondary keywords:	wood;fibre;pulp;grinding;paper;mechanical characteristics;
Type (COBISS):	Undergraduate thesis
Thesis comment:	Diplomsko delo, Univ. v Ljubljani, Biotehniška fak., Oddelek za lesarstvo
Pages:	XI, 64 f.
Keywords (UDC):	applied sciences;medicine;technology;uporabne znanosti;medicina;tehnika;agriculture and related sciences and techniques;forestry;farming;wildlife exploitation;kmetijstvo ter sorodne vede in tehnologije;forestry;gozdarstvo;forest products and their utilization;gozdni proizvodi in njihova uporaba;
ID:	21398