Abstract
The cooling time of the plastic materials obtained through injection represents a very important component of the total duration of the injection cycle. Due to this fact, the specialized literature mentions a large number of theoretical and experimental researches which make reference to the importance of the cooling speed for the economy of the injection process. This paper presents a comparative study regarding the application of more mathematical models that may permit the determination of the cooling time for a complex material obtained through injection within a mono cavity mould. Keywords: cooling time, injection moulding, plastic materials