Ultrasonic temperature-measuring device Ultratemp 6000
Ultrasonics Measure Melt Temperature
With the Ultratemp 6000 (patent pending), Sikora AG, Bremen, Germany, is introducing an ultrasonic temperature-measuring device for use with polyethylene melts (PE).
During production of PE pipe and tubing, melt temperature plays an essential role, since it affects both product quality and the productivity of the extrusion process. Organic peroxides are used to cross-link polyethylene materials. In this regard, the melt temperature is constrained to lie within tight tolerances. A proper prepared and homogeneous melt represents the lower tolerance; avoidance of premature cross-linking, the upper.
Conventional methods for measuring the melt temperature such as thermocouples, for example, affect the flow properties of the melt, according to Sikora and results in premature cross-linking. Contact measurements have the additional disadvantage of a slow response time and distortion of the reading due to frictional heat. The Ultratemp 6000 is a noncontact melt temperature-measuring system based on noninvasive ultrasonic technology. It measures the melt temperature during the production process and has no effect on the flow properties of the melt. Friction-related effects do not occur, ensuring a uniform melt viscosity for the extrusion process. Premature cross-linking downstream from the screens, which can lead to discoloration and scorching in the polyethylene material, is avoided. The measuring system consists of an adapter positioned in the flow channel between the extruder screw and extruder head. The adapter holds highly temperature-resistant ultrasonic sensors, i.e. an ultrasonic transmitter on one side and an ultrasonic receiver on the opposite side of the flow channel. The ultrasonic signal is sent from the transmitter to the receiver through the entire cross-section of the flowing plastics melt, providing a real-time reading of the melt temperature. The extremely high measuring rate guarantees a short response time and thus detection of even the smallest temperature variations with high precision.
The measuring device can be combined with the Ecocontrol 600, 1000 and 2000 display and control units. In addition to numerical and graphical presentation of the measured values, the processor systems can also display trends and statistical values. Logging of the measured values is provided as well. As an alternative, the Ultratemp 6000 can be supplied with a Profibus DP interface directly from the factory.
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