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Laboratory creping equipment
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.
Karlstad University, Faculty of Health, Science and Technology (starting 2013), Department of Engineering and Chemical Sciences.ORCID iD: 0000-0001-9545-7836
2014 (English)In: Journal of Adhesion Science and Technology, ISSN 0169-4243, E-ISSN 1568-5616, Vol. 28, no 6, p. 561-572Article in journal (Refereed) Published
Abstract [en]

Tissue production is largely dependent on the creping process as creping influences the paper properties and thus the quality of the end product and the runnability of the tissue machine. The process is very complex and includes numerous variables affecting the adhesion, and ultimately the creping of the tissue paper. To perform experiments on a full scale machine, or even a pilot machine, is very costly, therefore a laboratory scale creping device is demanded, able to replicate conditions encountered on a tissue machine. In this paper new laboratory testing equipment is developed, whereby the adhesion between paper and metal surfaces (when scraping off the paper with configurations similar to the industrial process) can be studied. A new method to adhere paper to metal, used in the new laboratory creping equipment, is also developed. To evaluate the equipment, different creping angles were tested. The scraping tests show a trend in decreasing creping force for an increasing creping angle.

Place, publisher, year, edition, pages
Taylor & Francis, 2014. Vol. 28, no 6, p. 561-572
Keywords [en]
adhesion, tissue paper, creping, testing, Yankee
National Category
Engineering and Technology Chemical Engineering
Research subject
Chemical Engineering
Identifiers
URN: urn:nbn:se:kau:diva-29920DOI: 10.1080/01694243.2013.849843ISI: 000328728200003OAI: oai:DiVA.org:kau-29920DiVA, id: diva2:660808
Available from: 2013-10-30 Created: 2013-10-29 Last updated: 2017-12-06Bibliographically approved
In thesis
1. New methods for evaluation of tissue creping and the importance of coating, paper and adhesion
Open this publication in new window or tab >>New methods for evaluation of tissue creping and the importance of coating, paper and adhesion
2013 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The creping process and the conditions on the Yankee cylinder dryer are key factors in a tissue paper mill, and they therefore need to be kept under good control in order to maintain a high and uniform quality. To this end it would be valuable to be able to make on-line measurements of Yankee coating thickness as well as the crepe structure of the tissue paper. The adhesion of paper to the cylinder affects the creping process and more information about the parameters that affect the adhesion is therefore of interest. To perform trials on a full scale or in a pilot plant is very costly and laboratory creping equipment is therefore sought after in order to be able to measure the adhesion force.

The coating layer for use on the cylinder was analysed. It contained a large amount of carbohydrates and could not be considered transparent. The thickness of the coating layer was measured on a laboratory cylinder with a method based on fluorescence. An optical brightener was added to the coating chemicals and the coating layer was subjected to UV-radiation. The intensity of the light emitted by the optical brightener was measured and gave an indication of the thickness of the coating layer. The equipment has to be further investigated before it is possible to implement the new sensor on-line.

New creping equipment and an adhesion method were developed for use on a laboratory scale. The equipment can operate with different creping angles and the force needed to crepe the paper can be measured. The highest creping force was obtained for papers of high grammage, low dryness at adhesion, high drainability, high fines content and high hemicellulose content.

A more direct method is to analyse the structure of the produced paper. Measurements were made on a tissue paper with an optical fibre sensor while the paper was travelling at low speed. The collected signal was mathematically analysed and the characteristic wavelength was calculated for different paper samples. These values were close to the wavelengths measured with an off line method by a commercial crepe analyser.

Abstract [en]

Baksidestext

The creping process is the heart of tissue paper manufacture. To control the process better, on-line measurements of paper structure and coating thickness are sought after. The creping is highly dependent on the adhesion of the paper to the Yankee dryer. To be able to measure the adhesion, laboratory creping equipment was also required. Different pulp parameters affect the adhesion and some of them have been investigated in this work.

The coating on the Yankee cylinder consisted mainly of fiber fragments and could not be considered as transparent, which had to be considered when choosing a method to measure coating thickness. A method based on the light emitted from an optical brightener in the coating when subjected to UV-irradiation was used, but has to be further improved before it can be used on-line.

A new laboratory creping method was developed to determine the adhesion between paper and metal, and the force needed to scrape off the paper with a doctor blade was measured. The highest creping force was obtained for papers made of pulp with a high drainability, high fines content and high hemicellulose content.

An optical method using reflected light to measure crepe wavelength on-line was developed. The paper travelled under a sensor and the light collected was mathematically analyzed to determine the most common wavelength.

Place, publisher, year, edition, pages
Karlstad: Karlstads universitet, 2013. p. 60
Series
Karlstad University Studies, ISSN 1403-8099 ; 2013:47Karlstad University Studies, ISSN 1403-8099
Keywords
tissue, creping, paper adhesion, Tissue paper, creping, paper adhesion, coating layer, adhesives, Yankee cylinder, crepe structure, wavelength measurements
National Category
Engineering and Technology
Research subject
Chemical Engineering
Identifiers
urn:nbn:se:kau:diva-29317 (URN)978-91-7063-525-0 (ISBN)
Public defence
2013-12-13, Nyqvistsalen, Karlstads universitet, Karlstad, 10:15 (English)
Opponent
Supervisors
Available from: 2013-11-22 Created: 2013-10-07 Last updated: 2015-11-26Bibliographically approved

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Boudreau, JonnaBarbier, Christophe

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