Tapio analyzer
The Tapio analyzer (or Tapio PMA ) is a device for the metrological analysis of paper profiles. The main use is in the paper industry . The manufacturer of the device is Tapio Technologies in Finland . Generally speaking, it is a type of tape drive on which narrow strips of paper (approx. 150-300 mm wide) are wound from one roll to another (rewinder). The paper web to be analyzed passes various sensors. Different properties of the paper can thus be analyzed quasi-parallel. These properties are for example:
- Basis weight
- thickness
- Filler content
- shine
- transmission
- Remission
- porosity
- Fiber orientation
- and much more.
When evaluating the measurement data obtained in this way, further paper properties can be calculated by combining measured channels. This concerns, for example, the density (calculated from weight per unit area and thickness) or opacity (calculated from transmission and remission).
When analyzing paper , a distinction is made between two main types of paper profiles: longitudinal (MD = machine direction) and transverse profile samples (CD = cross direction). This means the direction of production on the paper machine . The paper samples represent only a small part of the total daily production. Typical paper sample lengths are e.g. B. 3500 m what at a paper machine speed of z. B. 1800 m / min (current Newsprint paper machine) represents a production time of 116 s (approx. 2 minutes).
By using standardized sensors on all existing Tapio devices, it is possible to use paper analysis as an independent measuring method worldwide (further prerequisite, however, is the identical setting of the devices for e.g. measuring spot size or measuring speed and precise calibration of the sensors).
For the evaluation of the data determined with the help of the Tapio, on the one hand the time signals and statistical data are evaluated. Furthermore, an analysis of periodic disturbances can be carried out using a DFT analysis ( Discrete Fourier Transformation ) or the FFT analysis (Fast Fourier Transformation - special form of DFT). For the statistical evaluation of cross sections (CD), the mathematical rule analysis of components of variance (VCA) is used.
- Examples of data evaluation
mean cross profile of a CD analysis
MD evaluation: time signal
MD evaluation: frequency display
