Abstract: Process to cool and pelletize molten strands, which issue from nozzles and are first stretched in the region following the nozzles and then are cooled for the pelletizing operation. The strands are gently cooled up to a kneadable state while stretching and compacting along a tempering region, which is designed as a fluidized bed driven with gas, in particular air, and subsequently conveyed into an intensive cooling region, where the strands are chilled with cooling water and are substantially hardened, while feeding so as to cause stretching, for the subsequently pelletizing operation.

Abstract: Measuring cell for the spectral analysis of flowing media, in particular plastic melts, in which cell the medium to be analyzed flows between two opposing windows made of a radiation transparent material and is penetrated by radiation, where at least one window is held in a pipe, which can be moved by axial motion in the direction of the second window or away from said window in a bore of the measuring cell body with said measuring cell body being sealed, where the width of the gap between the windows and thus the layer thickness of the medium through which the radiation is to travel is variable. The pipe abuts in the region of the seal with a stepless cylindrical outer surface directly against the wall of the bore and in this region exhibits oversize in the disassembled state relative to the bore. The wall thickness of the pipe is small with respect to the outer diameter of the pipe at least in the region of the seal.