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A model is presented which can be used to predict the flow under consideration of fibre-matrix separation and fibre orientation during sheet-like parts compression molding of long fibre-reinforced thermoplastics for isothermal state. During a molding, fibre content and fibre orientation distributions are calculated from the separation and orientation equations, and the viscosity of composites is expressed as a function of fibre content and fibre orientation. Based on the viscosity, the model was developed using the finite element method, and random and unidirectional reinforced composites are simulated. By comparing the theory with experimental results, the model accurately predicts mold filling patterns for the composite materials.