| 摘要 |
The present invention relates to a net for screening granular materials such as coke into "undersize" and "oversize", the net possessing calibrated perforations 2, 2', 2'' aligned in parallel rows 3, 3', 3'' in or approximately in the direction in which the materials are moving. The upper face 1 of this net is provided, between the rows 3, 3', 3'' of perforations, with raised bands forming tracks 4, 4', 4'' which support the "oversize" material when the materials are moving through. These tracks are preferably made from a strongly abrasion-resistant material. They can be attached to the net by means of detachable assembly means 6, 6', 6''. If the net is made from a moulded material, the tracks can also be embedded in the net in the course of its moulding, or moulded integrally with the net. The invention improves the service life of screening nets. <IMAGE>
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