engleski

An overview of heat transfer studies during the curing of thermosets in moulds

The curing of unsaturated polyester was studied at various process conditions using different moulds. Experimental measurements of time - temperature profiles across the body of the mould serves as input experimental data for testing mathematical models of curing process. Temperatures were recorded in same places: at centre of the symmetry inside the mould filled with resin, at the point near the outer surface of the mould wall, and in the bulk inside the air heated thermostat. Various numerical models were developed by taking into account the mode of heat transfer, basically by convection from the air to the mould surface and the heat conduction through the resin, as well as the heat generated by cure reaction. Introduction of the carbon base filler reduced the amount of heat generated in the composite. As a result, presence of filler lowered the temperature in the mould. The convection heat transfer coefficient was determined by independent experiments with glycerol as medium inside the mould. The effects of process parameters like temperature of outer thermostat, resin composition and flow conditions were investigated and mathematical models were verified by simulation with experimental data. In order to obtain a successful simulation, the true process mechanism was quantitatively described. By solving the model, useful relations between the process and equipment variables were revealed and could be easily observed.

Curing; Polyester resin; Heat transfer coefficient; Mould; Mathematical model

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