Improvements to grinding balls for cleaning, and method and devices for their manufacture

摘要

The invention relates to a grinding ball (1) for cleaning, which is formed from a sponge-like compound of caoutchouc which comprises grinding grains (2) mixed intimately in this compound, the grains being formed by small pieces, covered on their side surface with dried adhesive (7), of a section of grinding material of polygonal, preferably square cross-section. <IMAGE>