The most common method of heating polymer sheet for thermoforming is radiative heating. In this paper, the radiative heating of opaque thermoplastic sheet has been studied by using a comprehensive numerical modeling approach. The evolution of sheet temperature upon heating, both at the surface and through the thickness was computed assuming one-dimensional transient heat conduction with radiative and conductive boundary conditions. The net-radiation method has been used to compute the total radiative heat on the thermoplastic sheet. Several complex and yet practical sheet heating cases are presented and discussed, and the utility of the newly developed modeling capability is demonstrated.

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