FIPS (Filament bundle position sensor)
The sensor allows contactless, fast and precise online measurement of the average deflection of a filament bundle in the blowing box and the light scattering on the fibers. Depending on the setting of the process parameters, the fibers are deflected to a greater or lesser extent by the air blow. The more stable the process is and the more evenly the fibers are spun, the smoother the filament bundle is in the blow chamber. FIPS therefore allows an online characterization of the process status and a very precise characterization of the process stability.
The sensor is therefore an ideal device for:
- Research into structural development in the production process
- Development, control and optimization of production processes
- Control of spinning processe
Through direct, contactless measurements, the know-how and know-why of structural development in production processes can be deepened.
Process development, plant maintenance
As shown below (see application examples below), changes to the process or the system can be observed directly. The fluctuation of the fibers in the blowing chamber allows a much faster and more accurate characterization of the process stability than the count of defects (fluff, breaks).
Quality control
- Development, control and optimization of production processes
- Research into structural development in the production process (
- Incoming inspection of critical further processing stages (e.g. stretching, dyeability)
- 180° arrangement (illumination in front, detector behind the filament bundle, see image above) for measurements through the blow-box
- Backscatter arrangement (from one side)
Software OSD (Windows)
OSD functions
- Evaluation and display of the measured values
- Import, export and simulation of measurements
- calibration
Application example
The figure (below) shows an example of the observation and evaluation of a change on the spinning machine with the help of this sensor: it could be observed directly that the influence of air pressure fluctuations on the process by opening and closing an approx. 5 m distant window or door, could be significantly reduced. After much more lengthy trials, the improvement could also be documented using the fluff rate.
In addition to the deflection of the fibers in the direction of the air blow, the intensity of the light scattered on the fibers can be measured with this sensor. In the 180° arrangement, this is proportional to the mean value of the 3rd power of the fiber radii. With a constant density of the fibers, the intensity is therefore proportional to the 1.5th power of the throughput of the spinning pump. This relationship can be checked online, for example, in a gravitational spinning experiment (see figure below). With a constant density of the material (or a constant ratio of the amorphous to the crystalline parts) and constant pigmentation, the measured scattering intensity is proportional to the mean value of the 1.5th power of the titer of the individual filaments.
Send us your samples for a first free test or let us convince you with a device demonstration in your house!
We would be glad to adapt our sensors to your needs or develop new functionality for your application.
Literature
- Hartrumpf, M.: "On line Prozeßkontrolle - Schritte zur On line Qualitätsüberwachung von Schmelzspinnprozessen";
Fortschrittsberichte VDI, Reihe 8: Meß-, Steuerungs- und Regelungstechnik, Nr. 321; VDI Verlag 1993 - Hartrumpf, M.: "FIPS - Ein Filamentbündel Positions-Meßsystem"; FhG-Berichte 4 / 1990 Mitteilungen aus dem Fraunhofer-Institut für Informations- und Datenverarbeitung IITB . 1990, S.24-28
Patents
- Hartrumpf, M.: "Vorrichtung zur gleichzeitigen Messung der Positionen und der Durchmesser der Filamente eines Filamentbündels", Europäisches Patent EP 0 439 803 B1
- Hartrumpf, M.: "Device for measuring the position of a filament bundle", United States Patent Nr. 5,315,371