Sökning: "Thermomechanical pulping"

Visar resultat 1 - 5 av 15 avhandlingar innehållade orden Thermomechanical pulping.

  1. 1. Wood and fibre mechanics related to the thermomechanical pulping process

    Detta är en avhandling från Sundsvall : Mid Sweden University

    Författare :Jan-Erik Berg; Mittuniversitetet.; [2008]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; Acoustic emission; Chips; Compression tests; Defibration; Disc refiners; Energy consumption; Fibre structure; Force sensors; Fracture; Impact strength; Mathematical analysis; Moisture content; Picea abies; Refining; Stiffness degradation; Strains; Temperature; Thermomechanical pulping; Velocity; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : The main objective of this thesis was to improve the understanding of some aspects on wood and fibre mechanics related to conditions in the thermomechanical pulping process. Another objective was to measure the power distribution between the rotating plates in a refiner. LÄS MER

  2. 2. Reduction of refining energy during mechanical pulping : using pressurised chip compression and sulphite pre-treatment

    Detta är en avhandling från Uppsala : Sveriges Lantbruksuniversitet

    Författare :Erik Nelsson; Mittuniversitetet.; Sveriges lantbruksuniversitet.; [2011]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; LANTBRUKSVETENSKAPER; AGRICULTURAL SCIENCES; Chip pre-treatment; double disc refiner; energy efficiency; Impressafiner; low dosage; Norway spruce; refining intensity; single disc refiner; sulphite pre-treatment; thermomechanical pulp;

    Sammanfattning : The effects of pressurised compressive chip pre-treatment and low dosage sulphite pre-treatment were evaluated for production of thermomechanical pulp in mill scale trials using Norway spruce (Picea abies) at the Braviken paper mill (Holmen Paper AB, Sweden). The general aim of the study was to improve the energy efficiency during the production of mechanical pulps suitable for news and improved news grade papers. LÄS MER

  3. 3. Measurement of shear force, temperature profiles and fibre development in mill-scale TMP refiners

    Detta är en avhandling från Sundsvall : Mittuniversitetet

    Författare :Hans-Olof Backlund; [2004]
    Nyckelord :Shear force; Tangential force; Temperature profile; Thermomechanical pulping;

    Sammanfattning : Two different force sensors have been developed for tangential forcemeasurements in commercial TMP refiners, one is based on the use of piezoelectricsensors and the other on strain gauges. The measurements are used to learn moreabout the refining mechanism in both single-disc (SD) refiners and conical disc(CD) refiners. LÄS MER

  4. 4. A Comprehensive Approach to Modeling and Control of Thermomechanical Pulping Processes

    Detta är en avhandling från Sundsvall : Mittuniversitetet

    Författare :Daniel Berg; [2005]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY;

    Sammanfattning : The central issue of the thesis is modeling and control of the Thermomechanical Pulp (TMP) process in which large refiners are used to produce pulp for newsprint. The TMP process is one of the most complex and versatile, electricity consuming industrial processes today. LÄS MER

  5. 5. Improved energy efficiency in double disc chip refining

    Detta är en avhandling från Sundsvall : Mittuniversitetet

    Författare :Dino Muhic; Mittuniversitetet.; [2010]
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; thermomechanical pulping TMP ; double disc refining; high intensity; TECHNOLOGY Chemical engineering; TEKNIKVETENSKAP Kemiteknik;

    Sammanfattning : The electrical energy consumption in thermomechanical pulping (TMP) is very high, in the range of 2 – 3 MWh/adt depending on process solution and on the product quality specifications for the paper product. Both pulpwood and energy prices have increased rapidly for some time. LÄS MER