A method of classifying a plastic, wherein the plastic is plasticized by supplying plasticizing energy in the form of mechanical and/or thermal energy with an increase in a temperature of the plastic from an initial temperature value to a final temperature value, a volume and/or a mass of the plastic and the supplied plasticizing energy is detected as measurement parameters by measurement means, in dependence on the detected measurement parameters, the initial temperature value, and the final temperature value at least one of the following is ascertained: a thermal capacity of the plastic and/or a change in enthalpy of the plastic and/or a parameter which can be derived by calculation from the thermal capacity and/or the change in enthalpy, and a plastic group including the plastic is identified on the basis of the ascertained thermal capacity and/or the ascertained change in enthalpy and/or the parameter which can be derived therefrom by calculation.

A heating module for heating at least one film element. The heating module has two or more heating segments with in each case one or more heating elements for heating a first area of the film element assigned to the respective heating segment, wherein the heating module and/or at least one of the heating segments includes at least one sensor for measuring the state of the heating of the film element.

A warm-air blowing circuit and another warm-air blowing circuit are disposed so as to heat a film from both sides of a projection side and a recess side of a die, warm air reaches and heats the film from the time of supplying of the film, warm air continues to enter a space in which a resin is to be ejected even after the die is closed, and thereby the film is likely to extend. Therefore, the film is unlikely to be torn at the time of molding when the film is likely to be shaped after a shape of the die and it is possible to prevent broken pieces of the film or broken pieces of a decoration film from being mixed and being stuck to the surface of the die such that it is possible to improve quality of the external appearance of a molded product.