Abstract: A control process for foaming and fusing plastics in a foaming and fusing device, and a fusing device for carrying out the process, in which the control process works in cycles, each cycle consists of phases which are at least an injection phase, a heating phase, a fusion phase, a cooling phase and a mould release phase, such phases being started and completed depending on control criteria comprising a time period, a pressure or a temperature limit value for the conditions evolving in the device such control criteria belonging to a certain cycle comprising a control criteria set, and with each cycle quality values of predetermined characteristics determined by measurements taken from the respective plastic part or an agglomerate cake situated in the device, a new set of control criteria being generated for each new cycle from prior control criteria depending from the quality values measured with such prior cycle of the control process, wherein the quality values of each cycle are combined to a deviation which

Abstract: A method for foaming and sintering of foamable plastic employing a control method based on the detection of the softening time point during the sintering steam application in the sintering process step. The softening time point is detected by analysis of a change in the rising speed of the pressure or temperature, and the related pressure and temperature values are used for determining the maximum dismission temperature and pressure of the sintered product. The sintering time is determined in relation to the softening time point and the quality demanded. A feed back control to the prefoaming and drying process step is provided. A feed back control by means of a quality measurement at the sintered part to the sintering is provided. Incremental controls are provided for adaptive process optimization.