DETERMINATION OF STRENGTH PROPERTIES OF NORWAY SPRUCE AFTER SULPHATE COOKING AND OXYGEN DELIGNIFICATION
He, Zhikai (2011)
Saimaan ammattikorkeakoulu
2011
Creative Commons Attribution-NonCommercial 1.0 Finland
Julkaisun pysyvä osoite on
http://urn.fi/URN:NBN:fi:amk-201105178267
http://urn.fi/URN:NBN:fi:amk-201105178267
Tiivistelmä
The aim of this thesis was to analyze the strength properties of Norway spruce kraft pulp required for the paper making process. In the theoretical part, the properties of Norway spruce were introduced, and its comparison properties with pine and birch were physical and chemical aspects of different wood species and their properties by Saimaa University of Applied Sciences, Imatra.
In the experimental part, there are two different types of kraft pulp were studied; one pulp with sulphate cooking process treatment, and another one with the oxygen delignification. All these pulp were produced from the fresh Norway spruce chips in liquid circulated batch digester by kraft pulping process. Screened pulps were beaten by PFI mill in 0, 2000, 4000, 6000 and 8000 revolution degrees. Fiber length was measured by Kajaani FS 300; the water retention test was also done with the specific equipment. Paper sheets were made by rapid Köthen sheet mould. Tear strength, burst strength, tensile strength, thickness and weight were measured from the paper sheets.
In the experimental part, there are two different types of kraft pulp were studied; one pulp with sulphate cooking process treatment, and another one with the oxygen delignification. All these pulp were produced from the fresh Norway spruce chips in liquid circulated batch digester by kraft pulping process. Screened pulps were beaten by PFI mill in 0, 2000, 4000, 6000 and 8000 revolution degrees. Fiber length was measured by Kajaani FS 300; the water retention test was also done with the specific equipment. Paper sheets were made by rapid Köthen sheet mould. Tear strength, burst strength, tensile strength, thickness and weight were measured from the paper sheets.