Method and apparatus for detecting strand heterogeneity of material strands in the tobacco processing industry

摘要

The method involves inserting objects (72) into a material rod (71) at predetermined object positions, and conveying the material rod in a longitudinally axial manner through two strand measuring devices (30,40) operated with different frequencies. The measurement signals of the strand measuring devices in the object sections and the blank sections are evaluated with different evaluation processes. A position determination or quality control of the object is carried out in the object sections from the temporal variation of one of the measurement signals in an object algorithm (85a). The blank section algorithm (85b,85c) is applied in the blank sections, with which the strand inhomogeneity is detected, and the strand consistency or quantity of an additive in the material rod is determined. Independent claims are included for the following: (1) an apparatus for use in a rod machine, particularly tobacco rod machine or filter rod machine for detecting strand inhomogeneity of a material rod, particularly of the inserted objects, defective objects and foreign bodies in the tobacco processing industry; and (2) a software program with program code medium for detecting strand inhomogeneity of a material rod, particularly of the inserted objects, defective objects and foreign bodies in the tobacco processing industry.