Sökning: "thermoplastics"

Visar resultat 21 - 25 av 30 avhandlingar innehållade ordet thermoplastics.

  1. 21. Flow-induced Surface Defects and Ageing Behaviour of Injection-moulded Polymers

    Författare :Giovanna Iannuzzi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; PP; surface defects; flow marks tiger stripes ; ageing; Injection moulding; ABS; rheological properties; degradation; surface topography; discolouration;

    Sammanfattning : Injection moulding is one of the most commonly used manufacturing methods for the production of polymer-based components such as car bumpers and other automotive details. The surface appearance of these products is of great importance since it is directly connected to the perceived quality. LÄS MER

  3. 22. On the Characterization and Generation of Flow Marks on Polymeric Surfaces

    Författare :Giovanna Iannuzzi; Chalmers tekniska högskola; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; tiger stripes; surface defects; rheological properties; injection moulding; polymer processing; flow marks;

    Sammanfattning : Polymer-based materials are widely used in the automotive industry for producing vehicle parts, for instance car bumpers, dash boards etc. A common manufacturing process for such components is injection moulding. LÄS MER

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

    Författare :Nabil Khoshaba; []
    Nyckelord :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;

    Sammanfattning : 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. LÄS MER

  5. 24. Metabolic engineering of Saccharomyces cerevisiae for polyhydroxybutyrate production

    Författare :Kanokarn Kocharin; Chalmers tekniska högskola; []
    Nyckelord :NATURVETENSKAP; NATURAL SCIENCES; S. cerevisiae; Acetyl-CoA; NADPH; Metabolic engineering; Polyhydroxybutyrate;

    Sammanfattning : Establishing industrial biotechnology for the production of chemical compounds from the biosynthetic pathway has received a significant boost with the implementation of metabolic engineering. At present, metabolic engineering in Saccharomyces cerevisiae gains significant advantages of integration of knowledge acquired through a long history of use and data acquisition from novel –omics technologies hence enabling the development of a tailor-made S. LÄS MER

  7. 25. Forming of stacked unidirectional prepreg materials

    Författare :Ylva Larberg; Malin Åkermo; Dan Zenkert; Kevin Potter; KTH; []
    Nyckelord :TEKNIK OCH TEKNOLOGIER; ENGINEERING AND TECHNOLOGY; SRA - Production; SRA - Produktion;

    Sammanfattning : To reduce cost of structural composites, the development of more efficient manufacturing methods is of great interest. An automatic tape layer (ATL) can be used to perform the layup in an efficient way for flat sheets and the second step is by pressure forming the prepreg stack onto a given mould. LÄS MER