Search for dissertations about: "foaming"

Showing result 1 - 5 of 43 swedish dissertations containing the word foaming.

  2. 1. Foaming of cellulose derivatives and hemicellulose-containing materials

    Author : Kristina Karlsson; Chalmers University of Technology; []
    Keywords : β-glucan; arabinoxylan; scale-up production; hydroxypropyl methylcellulose HPMC ; ethyl hydroxyethyl cellulose EHEC ; hot-mould foaming; extensional viscosity; extrusion; hemicellulose; rheological characterisation; Foaming; xylan; cellulose derivatives;

    Abstract : Fossil-based polymeric foams are important materials due to their good mechanical properties relative their low density, the low price and the possibility for large-scale production. They are widely used in cushioning, absorbing and insulation applications. There are however a few disadvantages with these foamed products. READ MORE

  4. 2. Foaming of Some Cellulose Derivatives - Initial Studies

    Author : Kristina Karlsson; Chalmers University of Technology; []
    Keywords : rheological characterisation; Foaming; hydroxypropyl methylcellulose HPMC ; scale-up production; ethyl hydroxyethyl cellulose EHEC ; hot-mould baking; cellulose derivatives; extrusion;

    Abstract : Fossil-based polymeric foams, based on polymers such as polystyrene and polyurethane, are important and widely employed materials due to their good mechanical properties relative their low density, the low price and the possibility for large-scale production. There are however a few disadvantages with these foamed products. READ MORE

  5. 3. On the Dielectric Losses of Polyethylene at Medium and High Frequencies

    Author : Martin Strååt; Chalmers University of Technology; []
    Keywords : Dielectric properties; foaming; crystallinity; polyethylene; frequency; porosity;

    Abstract : AbstractAs mobile communication moves from 3G to 4G, the bandwidth used will be extended from 2 GHz to 5 GHz. The propagation loss is related to the 2.6:th power of frequency, thus a large increase in power consumption may be expected. READ MORE

  6. 4. Flow, expansion and processing behaviours of gas-containing filled polyethylene

    Author : Nabil Khoshaba; []
    Keywords : TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; mechanical properties; flow rate; critical pressure; injection moulding; expansion kinetics; fillers; rheological properties; foaming; composite materials; partial pressure; capillary viscometry; Blowing agent;

    Abstract : The utilization of fillers in polymeric materials has exhibited a substantial growth during the last decades. Chalk (calcium carbonate) and glass fibres are two common examples of such fillers. These fillers/reinforcing elements are used in order to reduce the cost of material and change its physical (mechanical) properties. READ MORE

  7. 5. Surface Chemistry Studies on Surfactant Properties Relevant to Flotation De-inkin

    Author : Katarina Theander; KTH; []
    Keywords : de-inking; sodium oleate; nonionic surfactant; surface tension; foaming;

    Abstract : The objective of this work was to investigate thephysico-chemical properties of common de-inking chemicals. Thishas been done by means of equilibrium and dynamic surfacetension measurements as well as foaming experiments. READ MORE