Effect of changes in fibres’ internal and external fibrillation on dewatering properties in paper making

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dc.contributor Aalto-yliopisto fi
dc.contributor Aalto University en
dc.contributor.advisor Hiltunen, Eero
dc.contributor.author Yang, Yang
dc.date.accessioned 2014-09-17T07:20:59Z
dc.date.available 2014-09-17T07:20:59Z
dc.date.issued 2014-09-09
dc.identifier.uri https://aaltodoc.aalto.fi/handle/123456789/13974
dc.description.abstract The papermaking process can be described as a process to remove water from pulp. The purpose of this thesis is to evaluate the effects to dewatering properties in each sub-process including forming, pressing and drying. Lampen mill refiner and Voith LR-40 refiner is used to generate 4 different types of pulp which are subject to dewater with laboratory papermaking process. Moving belt former (MBF) was used to forming sheets and this machine also can generate different vacuum levels to remove the water from the wet web. Then the wet sheets are dewatered with MTS-press which can generate high pressure in a millisecond scale. IR-dryer was used to dry the sheets to evaluate the evaporation rate. It is found that with the increasing energy level in refining, the heavily refined fibres are shorter, more fibrillation, straight and fines than that of lightly refined. Meanwhile, the Voith refined fibres have more fibrillation than Lampen refined pulp. In forming part, the vacuum curves and surface level curves can be characterized by MBF. When high vacuum level applied on wet web, the heavily refined pulps or high fines content furnishes have higher vacuum curves and longer drainage time because the fibrillations and more fines result in the web denser and less permeable. Voith refined samples have higher vacuum curves and longer drainage time than that of Lampen mill refined samples. The dry solid content was measured after each sub-step. Heavily refined samples have lower dry solid content than that of lightly refined samples and Voith heavily refined samples have lower dry solid content than that of Lampen heavily refined samples. The heavily refined pulps or more fines content have the lower speed to be dried. Lightly refined samples have higher evaporation rate than of heavily refined samples. en
dc.format.extent 72
dc.format.mimetype application/pdf en
dc.language.iso en en
dc.title Effect of changes in fibres’ internal and external fibrillation on dewatering properties in paper making en
dc.type G2 Pro gradu, diplomityö en
dc.contributor.school Kemian tekniikan korkeakoulu fi
dc.subject.keyword fibrillation en
dc.subject.keyword dewatering en
dc.subject.keyword moving belt former(MBF) en
dc.subject.keyword vacuum level en
dc.subject.keyword MTS-press en
dc.subject.keyword IR-dryer en
dc.subject.keyword dry solid content(DSC) en
dc.identifier.urn URN:NBN:fi:aalto-201409172613
dc.programme.major Fibre Products Technology fi
dc.programme.mcode KM3003 fi
dc.type.ontasot Master's thesis en
dc.type.ontasot Diplomityö fi
dc.contributor.supervisor Paltakari, Jouni
dc.programme BTT - Biotuotetekniikan koulutusohjelma fi
dc.location PK fi


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