| 摘要 |
A device (12) serves as a means for testing a mat (11) moved in one direction (7) and made of biomass particles for manufacturing boards, more specifically in a double band press. On one side of the mat (11), radiation sources (33, 35) are positioned with a transversely spaced-apart relationship (30) transverse to the direction of motion (7). On the other side of the mat (11), a line (34, 36) of detector elements (44, 44', 51) is arranged beneath each of the radiation sources (33, 35), a fan-shaped beam (37) impinging on said detector elements. The beam passes either only through one standard body (43) or only through the mat (11) or through neither the standard body nor the mat and is received by the detector elements and converted into electrical output signals. Said output signals are transferred via lines (45, 45', 52) to an evaluating circuit (46) that controls when needed a device (13) for removing mat portions which contain unwanted, overdense foreign matter or the weight per unit area of which is too low. |
