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  • 1. Al-Dajani, W. W.
    et al.
    Gellerstedt, Göran
    KTH, Superseded Departments, Pulp and Paper Technology.
    The effect of polysulphide pre-treatment and cooking parameters on the chemical properties and TCF bleachability of alkaline pulps2001In: Pulp & paper Canada, ISSN 0316-4004, Vol. 102, no 8, p. 44-48Article in journal (Refereed)
    Abstract [en]

    The effect of pre-treating softwood chips with polysulphide on the chemical properties of the resulting pulp has been investigated. During subsequent pulping after such pre-treatment, high alkali content is maintained in the cooking liquor and, consequently, an unbleached pulp with a decreased amount of hexenuronic acid is obtained. As compared to other kraft pulps in this study, a polysulphide pre-treatment gives high cooking field, a high viscosity and brightness for the unbleached pulp and a pulp of good bleachability.

  • 2. Andersson, J.
    et al.
    Wågberg, Lars
    KTH, School of Chemical Science and Engineering (CHE), Fibre and Polymer Technology.
    Ageing of Flexographic Printed Model Cellulose Surfaces and Determination of the Mechanisms Behind Ageing2009In: Pulp & paper Canada, ISSN 0316-4004, Vol. 110, no 6, p. 34-38Article in journal (Refereed)
    Abstract [en]

    The influence of storage conditions on the ink detachment efficiency of water-based flexographic ink printed onto model cellulose surfaces and handsheets was investigated. It was shown that UV light, elevated temperatures, longer storage time, increasing surface roughness, and increasing surface hydrophobicity all had a negative effect on ink detachment. It was also shown that the ink's chemical and structural characteristics changed when stored at elevated temperatures. No chemical or structural changes could be observed for the ink when stored under UV light.

  • 3.
    Björk, Anders
    et al.
    KTH, Superseded Departments, Chemistry.
    Danielsson, Lars-Göran
    KTH, Superseded Departments, Chemistry.
    Extraction of Distribution Curves from Process Acoustic Measurements on a TMP-process2004In: Pulp & paper Canada, ISSN 0316-4004, Vol. 105, no 11, p. 42-46Article in journal (Refereed)
    Abstract [en]

    We have developed a method to extract fibre length distributions from acoustic data recorded on pulp streaming from a TMP refiner. The method is based on the use of a Continuous Wavelet Transform, CWT. Measurements were performed using an accelerometer on the refiner blow-line during a full-scale trial with a double disc refiner. During trials conditions were varied over a wide range. The agreement is good between results from our method, CWT-FLE and from FiberMaster.

  • 4. Cui, H.
    et al.
    Jacobsen, Elling W.
    KTH, Superseded Departments, Signals, Sensors and Systems.
    Optimal design of buffers in plants with recycling2002In: Pulp & paper Canada, ISSN 0316-4004, Vol. 103, no 6, p. 25-29Article in journal (Refereed)
    Abstract [en]

    Buffer tanks are commonly employed to dampen the effect of disturbances in chemical processes. In order to minimize the number and size of tanks, the buffers Should be designed to Mainly handle disturbances that cannot be effectively handled by a feedback Control system. In this paper we consider optimal design of buffers in plants with recycle of material and/or energy. Such recycling is becoming common in process plants, and typically increases the disturbance sensitivity significantly, and hence the potential need for buffers. We Show that the location of the buffer is a crucial decision in recycle systems, and derive simple model-based tools that Call be used to determine both the optimal Size and location of buffers ill recycle systems.

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