search query: @keyword retention / total: 14
reference: 4 / 14
« previous | next »
Author:Lindholm, Mikko
Title:Nanofibrilloidun selluloosan lisäyksen vaikutus päällystyspastan ja päällystetyn paperin ominaisuuksiin
Adding nanofibrillated cellulose to effect coating color and coated paper properties
Publication type:Master's thesis
Publication year:2010
Pages:69 + [17]      Language:   fin
Department/School:Puunjalostustekniikan laitos
Main subject:Paperi- ja painatustekniikka   (Puu-21)
Supervisor:Paltakari, Jouni
Instructor:Pynnönen, Hanna
OEVS:
Electronic archive copy is available via Aalto Thesis Database.
Instructions

Reading digital theses in the closed network of the Aalto University Harald Herlin Learning Centre

In the closed network of Learning Centre you can read digital and digitized theses not available in the open network.

The Learning Centre contact details and opening hours: https://learningcentre.aalto.fi/en/harald-herlin-learning-centre/

You can read theses on the Learning Centre customer computers, which are available on all floors.

Logging on to the customer computers

  • Aalto University staff members log on to the customer computer using the Aalto username and password.
  • Other customers log on using a shared username and password.

Opening a thesis

  • On the desktop of the customer computers, you will find an icon titled:

    Aalto Thesis Database

  • Click on the icon to search for and open the thesis you are looking for from Aaltodoc database. You can find the thesis file by clicking the link on the OEV or OEVS field.

Reading the thesis

  • You can either print the thesis or read it on the customer computer screen.
  • You cannot save the thesis file on a flash drive or email it.
  • You cannot copy text or images from the file.
  • You cannot edit the file.

Printing the thesis

  • You can print the thesis for your personal study or research use.
  • Aalto University students and staff members may print black-and-white prints on the PrintingPoint devices when using the computer with personal Aalto username and password. Color printing is possible using the printer u90203-psc3, which is located near the customer service. Color printing is subject to a charge to Aalto University students and staff members.
  • Other customers can use the printer u90203-psc3. All printing is subject to a charge to non-University members.
Location:P1 Ark Aalto  2199   | Archive
Keywords:nanofibrillated cellulose
mikrofibrillated cellulose
retention
viscocity
pigment coating
nanofibrilloitu selluloosa
mikrofibrilloitu selluloosa
retentio
viskositeetti
pigmenttipäällystys
Abstract (eng): The goal of this thesis was to examine the effects of adding nanofibrillated cellulose to coating color and also the properties of coated paper.

In the literature part, pigment coating was examined along with coating color components and their properties.
In addition to properties of nanofibrillated cellulose, the properties of coated paper were also examined.

The experimental part was divided into preliminary tests and actual tests.
During the preliminary study coating color of calcium carbonate and kaolin was prepared.
Coating color was then added to different amounts of NFC's.
The viscosities and retentions of the coating color were then measured.
Based on preliminary tests calcium carbonate was selected as pigment.

In actual experiments only one pigment was used in which the variables were NFC dosage, NFC's grinding level and latex/starch ratio.
Coating color viscosities were measured as well as retentions.
LWC paper was coated with blade coating once on the other side.
Coated papers were measured in opacity, whiteness, gloss, PPS-roughness and surface strength.

The results were divided into three groups according to the coat weight and were analyzed using regression analysis to determine the impact.
Viscosity increased by NFC's dosage, while the retention decreased.
Increasing NFC's grinding ratio did impact viscosity where no starch was involved.
Other effects from the degree of grinding were not established.
Effects on optical properties and roughness were only marginal and on gloss NFC's had no impact at all.

NFC is a good thickener on coating color but bad co-binder.
NFC's impact is greater at low coating weights.
Effect on optical properties and roughness is marginal, especially in noncalandered papers.
Grinding NFC's has a significant impact on the viscosity.
Abstract (fin): Diplomityön tavoitteena oli selvittää nanofibrilloidun selluloosan lisäyksen vaikutukset päällystyspastaan ja päällystettyyn paperiin.

Työn kirjallisuusosassa perehdyttiin pigmenttipäällystykseen sekä päällystyspastan komponentteihin ja ominaisuuksiin.
Nanoselluloosan ominaisuuksien ja valmistuksen lisäksi tarkasteltiin päällystetyn paperin eri ominaisuuksia.

Työn kokeellinen osa jakautui esikokeisiin ja varsinaisiin kokeisiin.
Esikokeissa valmistettiin pastat kalsiumkarbonaatista sekä kaoliinista.
Pastoihin lisättiin eri määriä NFC:tä.
Pastoista mitattiin viskositeetit ja retentiot.
Esikokeiden perusteella valittiin varsinaisiin kokeisiin pigmentiksi kalsiumkarbonaatti.
Varsinaisissa kokeissa pastoissa käytettiin vain yhtä pigmenttiä ja muuttujina NFC:n määrää, NFC:n jauhatusastetta sekä lateksin ja tärkin suhdetta.
Pastoista mitattiin viskositeetit sekä retentiot.
LWC paperi päällystettiin teräpäällystyksellä kerran toiselta puolelta valmistetuilla pastoilla.
Päällystetyistä papereista mitattiin opasiteetti, vaaleus, kiilto, PPS-karheus ja pintalujuus.
Tulokset jaettiin kolmeen ryhmään päällystemäärän mukaan ja analysoitiin regressioanalyysin avulla vaikutusten selvittämiseksi.

Viskositeetti nousi NFC:n määrän funktiona, kun taas retentio heikkeni NFC:n määrää kasvatettaessa.
NFC:n jauhatusaste vaikutti viskositeettiin koepisteissä joissa ei ollut tärkkiä.
Muita vaikutuksia jauhatusasteella ei ollut.
Optisiin ominaisuuksiin sekä karheuteen vaikutukset olivat vain marginaalisia ja kiiltoon ei NFC:n todettu vaikuttavan ollenkaan.

NFC on hyvä paksuntaja pastassa mutta huono apusideaine.
NFC:n vaikutus on suurempi alhaisilla päällystemäärillä.
Vaikutus optisiin ominaisuuksiin on marginaalinen varsinkin kalanteroimattomalla paperilla.
NFC:n jauhatuksella on suuri vaikutus viskositeettiin.
ED:2010-10-13
INSSI record number: 41059
+ add basket
« previous | next »
INSSI