On the heat balance during double-gated, modulated-pressure injection moulding

Double-gated, modulated-pressure moulding provides orientation of molecules or fibres so that the properties of materials can be controlled during processing. A numerical method for estimating the duration of oscillating flow under a preset pressure amplitude based on the balance of viscous heating...

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Bibliographic Details
Published in:International journal of heat and mass transfer 1998, Vol.41 (6), p.963-974
Main Authors: Zhang, T, Evans, J.R.G, Bevis, M.J
Format: Article
Language:English
Subjects:
Applied sciences
Exact sciences and technology
Heating
Injection moulding
Machinery and processing
Molecular dynamics
Moulding
Numerical methods
Oscillations
Plastics
Polymer industry, paints, wood
Pressure effects
Solidification
Technology of polymers
Thermal diffusion
Viscosity
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Summary:Double-gated, modulated-pressure moulding provides orientation of molecules or fibres so that the properties of materials can be controlled during processing. A numerical method for estimating the duration of oscillating flow under a preset pressure amplitude based on the balance of viscous heating and loss to the mould wall is described. This first attempt to quantify an extremely complex process allows the effects of moulding parameters on solidification to be deduced and the experimental array reduced. The predictions are compared with experimental results for high and low thermal diffusivity materials.
ISSN:0017-9310
1879-2189
DOI:10.1016/S0017-9310(97)00231-7