Abstract

The invention relates to a categorizing method and to a method based thereon for preventing production disruptions of a paper machine (1), in particular a web break, and to a computer program product for carrying out such a method. The following steps are carried out: 1.1 providing a first data quantity (D1) of historical signal values; 1.2.1 selecting a disruption time (t1...tn) for a plurality of the signals from the first data quantity (D1), in particular for each signal, determining the change (ΔSx…ΔSx) of each signal value during a period of time prior to the selected disruption time, and allocating a respective characteristic number value (ZW1…ZWx) to each signal change; 1.2.2 combining the individual characteristic number values (ZW1…ZWx) for the selected disruption time in order to form a series (R1…Rn); 1.3 repeating steps 1.2.1 and 1.2.2 multiple times for each additional selected disruption time (t1…tn); 1.4 segmenting the series (R1…Rn) obtained in this manner into different categories (K1…Km), each category (K1...Km) representing a type of disruption, in particular a type of web break; 1.5 outputting (A1, A2, A3, A4) the formed categories (K1...Km) and/or the series (R1...Rn) assigned to each category on a terminal (24) and/or in the DCS and/or in the QCS; and 1.6 forming a respective predictive model (P1...Pm) for each of the categories (K1...Km) in that the series (R1...Rn) assigned to each category (K1...Km) is analyzed, wherein a suitable predictive model (P1...Pm) is formed for each category, and such that the predictive models (P1...Pm) are suitable for analyzing a second data quantity (D2) of signal values as time series and for specifying a signifier for each corresponding category (K1...Km), said signifier describing a category-specific risk of disruption.

IPC Classes  ?

• D21F 7/04 - Paper-break control devices
• D21G 9/00 - Other accessories for paper-making machines