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En jämförelse mellan kräppat tissuepapper och okräppat papper innan brottbelastning
Örebro University, School of Science and Technology.
2014 (Swedish)Independent thesis Basic level (professional degree), 10 credits / 15 HE creditsStudent thesisAlternative title
A Comparison between Creped Tissue Paper and Uncreped Paper before Loaded to Point of Rupture (English)
Abstract [sv]

Kräppat pappers kraft och töjningskurva är mer dragstyv till 5 % töjning för att sedan bli mindre dragstyv. Vid tillverkningens kräppningsprocess veckas pappret det borde göra det mindre dragstyvt i början av kraft och töjningskurvan för att sedan bli mer dragstyv när fiber – fiber – bindningarna tar upp last. För att få mer förståelse för fibrerna kontra kräppningens betydelse för kräppats pappers materialegenskaper, har en jämförelse mellan kräppat och okräppat papper gjorts.

Arbetet har genomförts genom att observera kräppat papper och okräppat papper i en dragprovare under tiden har det spelats in av en usb – mikroskops - kamera. De dragprovstester av kräppat och okräppat papper som utfördes var standardtester ISO 12615 - 4: 2005, avlastningstester, vinklad kameratester och stabil spricktillväxttester. Resultaten ifrån mätningarna var att kräppat papper får en markant styvhetsökning vid avlastningstester det fick inte okräppat papper. Luftfickorna eller kratrarna som bildas av pappersmassan som inte ligger emot beläggningen på yankeecylindern, börjar dras ut först i den mindredragstyva delen av kräppat pappers kraft och töjningskurva. Det behövs bättre åtkomst för mikroskopskameran vid dragprovarens inspänning eller ett mindre mikroskop, för att kunna vinkla kameran och få bättre bilder på kräppstrukturen.

Abstract [en]

Creped-paper stress-strain curve has higher stiffness until 5 % strain thereafter it becomes less stiff. At manufacturing the creeping process wrinkles the paper that should make the paper less stiff in the beginning of the stress-strain curve and stiffer when the fiber-fiber- connections starts to take up load. A comparison has been made between creped-paper and un-creped-paper, for the benefit to get better knowledge of the importance between the fibers and the creeping process for creped papers material properties. The practical work of the project has been to observe creped-paper and un-creped-paper in a material testing machine while it has been recorded by a usb – microscope - camera. The material testing machine test of creped-paper and un-creped-paper that was executed was standard tests of ISO 12615 - 4: 2005, release-of-load-tests, camera-angle-tests and stable-crack-tests.

The results from the release-of-load-tests, was that creped-paper gets a significant stiffness increase, that didn’t un-creped-paper get. The air-pockets or craters who are made by the paper-mass that aren’t stuck to the yankee-cylinders adhesive, the craters begins to stretch out during the less stiff part of creped-papers stress-strain-curve. To get good angle usb-microscope-camera footages of the creping-structure, the usb-microscope-camera has to be smaller or the area at the material testing machines grip to grip has to be larger.

Place, publisher, year, edition, pages
2014. , 29 p.
Keyword [sv]
Materialteknik, kräppat papper, pappers hållfasthet
National Category
Mechanical Engineering
Identifiers
URN: urn:nbn:se:oru:diva-35517OAI: oai:DiVA.org:oru-35517DiVA: diva2:729195
Subject / course
Mechanical Engineering
Supervisors
Examiners
Available from: 2014-06-26 Created: 2014-06-25 Last updated: 2017-10-17Bibliographically approved

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