Abstract: The present invention concerns a mixing device having a preferably rotating container for accommodating material to be mixed, at least one mixing tool arranged in the interior of the container and a heating device for heating the material to be mixed. To provide a mixing device of the kind set forth in the opening part of this specification which permits the fastest possible heating of the material to be mixed, preferably also to temperatures higher than 200° C., it is proposed in accordance with the invention that the container at least partially comprises an electrically conductive material and the heating device has at least one coil which can be excited by an electric alternating field and which is so arranged that eddy currents are produced in the electrically conductive material of the container by the magnetic field change which occurs when the current flow changes.

Abstract: The invention relates to a mixing blade (6) consisting, of a base part (15) fixable to a shaft and a removable wearable element (12). The aim of said invention is to develop a more economical mixing blade. For this purpose, the wearable element (12) and the base part (15) overlap on at least 30% of the base part length and define different cross-sections of the mixing blade (6) in said area.

Abstract: A method for investigation of essentially similar samples for leaks, whereby the samples are introduced to a leak detection device by means of a transport device. The samples are investigated for leaks and removed by means of a transport device. An “in-line” leak investigation of the samples may be carried out in which each sample is placed in one of several test chambers that are located on a circular support. During the rotation of the support, the leak test is first prepared and then carried out, and finally the sample is removed from its respective test chamber and taken away.

Abstract: The invention relates to a method for performing a leak test on a gas generator (1), especially for airbags, according to which: the gas generator (1) is filled with a pressurized gas mixture, among other things, helium; the gas generator (1) filled with the gas mixture is introduced into a test chamber (2); gas is evacuated from the test chamber (2); the amount of helium exiting from a possibly present leak is determined with the aid of a sensor, and; the signal furnished by the sensor is used for determining the tightness/leakage of the gas generator (1). In order to accomplish the goal of performing a cost-effective search for leaks, the invention provides that the gas generator (1) is filled with a gas mixture whose helium proportion is equal to at least 50%.