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  • 1.
    Aronsson, Gunnar
    Linköping University, Department of Mathematics, Applied Mathematics. Linköping University, The Institute of Technology.
    Five Geometric Principles for Injection Molding2003In: International polymer processing, ISSN 0930-777X, E-ISSN 2195-8602, Vol. 18, no 1, p. 91-94Article in journal (Refereed)
    Abstract [en]

    A condensed presentation of some results of a geometric character, concerning the injection molding of plastics, is given here. The author has derived these results from mathematical arguments and some simplifying assumptions, besides the usual Hele-Shaw flow conditions.

    The presentation here is intended for readers with an interest in polymer processing, rather than mathematics, so that the mathematical derivations are omitted in some cases, and sketchy in other cases. Instead we try to explain the results using figures, intuitive arguments and a few inevitable formulas. Since the experimental verification of the results is still very incomplete, we prefer to present them as proposed principles. Comments and suggestions for improvement are very welcome.

  • 2.
    Pisciotti, F
    et al.
    Chalmers Univ Technol, Dept Mat Sci & Engn, SE-41296 Gothenburg, Sweden Swedish Natl Testing & Res Inst, Dept Chem & Mat Technol, Boras, Sweden Linkoping Univ, Dept Math, S-58183 Linkoping, Sweden.
    Boldizar, A
    Chalmers Univ Technol, Dept Mat Sci & Engn, SE-41296 Gothenburg, Sweden Swedish Natl Testing & Res Inst, Dept Chem & Mat Technol, Boras, Sweden Linkoping Univ, Dept Math, S-58183 Linkoping, Sweden.
    Rigdahl, M
    Chalmers Univ Technol, Dept Mat Sci & Engn, SE-41296 Gothenburg, Sweden Swedish Natl Testing & Res Inst, Dept Chem & Mat Technol, Boras, Sweden Linkoping Univ, Dept Math, S-58183 Linkoping, Sweden.
    Aronsson, Gunnar
    Linköping University, The Institute of Technology. Linköping University, Department of Mathematics, Applied Mathematics.
    Evaluation of a model describing the advancing flow front in injection moulding2002In: International polymer processing, ISSN 0930-777X, E-ISSN 2195-8602, Vol. 17, no 2, p. 133-145Article in journal (Refereed)
    Abstract [en]

    The simulation of the advancing flow front during mould filling in the injection moulding cycle is important as a way of anticipating manufacturing defects, particularly different types of welds, air traps, cold spots and hot spots. The purpose of the present work was to evaluate a model (the distance model) simulating the advancing flow front and predicting potential issues related to the progression of the flow front such as welds and air traps. The distance model is based on a mathematical theory of Hele-Shaw flow for strongly shear-thinning fluids, i.e. fluids with a power-law index, n, equal to 0,3 or preferably less. Two grades of general-purpose polystyrene were selected according to their abilities to shear thin (weakly or moderately strong) at the selected processing temperature and in the typical shear rate range of the injection moulding process. The two grades were injection moulded into twelve mould configurations derived from two similar single-gated moulds. The flow length from the gate to the weld was measured in the mouldings obtained at three distinct rates of filling (conventional, slower and faster) and compared to the flow lengths obtained by the distance model. Good agreement was found between the predicted flow lengths and the experimental flow lengths at the conventional and faster filling conditions. Larger deviations between simulation and experiment were found at the slower filling rate, particularly for the weakly shear-thinning polystyrene grade. Some comparisons were also made with the predictions obtained using the commercial simulation code Moldflow. A comparison between the advancing front predictions of the distance model and experimental short shots of a commercial polypropylene grade in a lure-box type of mould geometry showed that the distance model, despite its simplicity, could probably be used to detect welds and air traps in more complex and practice-related mouldings.

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