Propusnost navigator papira u funkciji vremena i temperature starenja

Eškinja, Stanko (2011) Propusnost navigator papira u funkciji vremena i temperature starenja. Baccalaureus work - Undergraduate programme. Grafički fakultet. [Mentor: Barbarić-Mikočević, Željka].

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Abstract

U ovom radu provedena su ispitivanja na Navigator fotokopirnom papiru (80 g/m2). Za istraživanje se koristilo novo pakiranje kupa papira od 500 listova, gdje su uzimani listovi papira iz sredine i rezani na dimenzije 12,5 x 12,5 cm. Uzorci su izlagani različitim temperaturama i vremenskim intervalima. Uzorcima papira je odreĎen maseni udio vlage, pepela i kalcijevog karbonata te upojnost (Cobb test), koja se ispitivala na sitovoj i pustenoj strani. S istraživanjem se krenulo, jer je primjećeno da nakon otvaranja paketa papira i njihovim spremanjem u ormar za kasniju upotrebu dolazi do gubitaka nekih svojstava. Upojnost se znatno povećala, povećanjem temperature sa 30° C na 60° C, razlika očitana na obje temperature pri vremenu 8h iznosi 5,2 g/m2 za pustenu, tj. za sitovu 5,3 g/m2. Maseni udio pepela je ostao nepromjenjen ovisno o temperaturi što nam dokazuje da se unutar papira ništa drastično nije dogodilo, već možemo zaključiti da temperatura djeluje na skupljanje čestica papira, a zbog nedostatka vlage dogaĎa se da papir propusti.

Item Type:	Baccalaureus work - Undergraduate programme
Mentor name:	Barbarić-Mikočević, Željka
Defence date:	26 September 2011
Abstract in english:	Following research is show through Navigator photocopy paper (80 g/m2). For research we used new pack of 500 sheets of paper, where we took paper from the middle and than we cut them on dimensions 12,5 x 12,5 cm. Samples were exposed to diferent temperatures and diferent time intervals. Samples of paper we measured mass fraction of moisture, ash, Calcium Carbonate and absorption of paper ( Cobb test ), on top and wired side. We decided to make a research after we noticed that photocopy paper after opening its packaging and saving it in closet for later use it loses some of its properties. Results have shown us that absorption has risen up. Amount of ash depending of temperature hasn’t change. Ashes remained unchanged which proves that within paper nothing drastic has happened, so we can conclude that the temperature has effect on the shrinkage of paper particles and because a lack of moisture paper fails to absorb.
Uncontrolled Keywords:	fotokopirni papir, upojnost, ubrzano starenje
Keywords in english:	photocopy paper, absorption, accelerated aging of paper
Subjects:	TECHNICAL SCIENCES > Graphic Technology
Institution:	Grafički fakultet
City:	Zagreb
Number of Pages:	33
Callnumber:	bar 2011 ešk
Inventory number:	Z254
Status:	Unpublished
Date Deposited:	15 Nov 2013 21:45
Last Modified:	05 May 2014 13:17
URI:	http://eprints.grf.unizg.hr/id/eprint/1278

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