Particle size affects the performance of powder coatings

First, the domestic coating market situation Since 2011, most of the paint companies have operational difficulties, decreased effectiveness and other issues are more prominent. The two-headed squeeze of product prices and production costs has led to a substantial decline in corporate profits. At the

Bending and separation of layered rock mass

If the roof of the roadway is composed of a thin layer of rock with weak bonding force, when the width of the excavation body is large enough, the top plate may be significantly bent or even broken and collapsed. If the bending deformation develops upward, it will cause the multilayer to bend, the s