Zerkleinerungs- oder Raffinationsscheibe für Papierfaserbrei sowie Verfahren zu seiner Herstellung

摘要

A disc for defibering or refining paper pulp according to the invention includes a grinding surface which has a large number of ribs (9-12) separated by grooves (13-15). The disc body (8) consists of a first material such as stainless steel or cast iron, ensuring the general mechanical robustness of the disc in use. The upper part of the ribs (9-12) consists of a layer (16-19) of an abrasion-resistant material based on tungsten carbide particles bonded in a metal alloy whose melting and weldability characteristics are appropriate for refurbishing with a laser on the disc body (8). The ribs (9-12) are successively refurbished by scanning with a laser beam and a nozzle for spraying powder, in one or a number of runs.