solid brick machinery china

Spiral and S-shaped cracks refer to many concentric elliptical cracks like Steamed rolls on the large surface of solid brick, or S-shaped parallel curve cracks, which are all waste products. As the mud is pushed forward by the spiral cutter blade in the extruder, the forward speed of each point of the section is not the same. It is always fast in the middle and slow around. This speed difference tears the mud into several layers. When the layered mud rotates with the spiral cutter, it is wrapped into a “Steamed rolls”. Between the adjacent two layers of mud, there is air and squeezed water. Instead of being bonded as a whole, spiral lines or S-shaped cracks appear.solid brick machinery china

This problem is easily detected when cutting bricks. The solution is to take the thinner waste material cut off at both ends of the mud strip by the cutting machine and manually break its four corners. If the broken parts are all circular arcs and the cross-section is smooth, there are undoubtedly spiral or S-shaped cracks, which should be treated as waste.solid brick machinery china
The fundamental solution is to increase the coarse particles of the mud, that is, the percentage of filling particles with a particle size of 0.05-1.2mm in the mud, especially the percentage of angular particles. The clay is delicate and the clay bricks are prone to spiral patterns; Coal gangue, harder shale, and mud particles are coarse and all angular, so coal gangue bricks and shale bricks have basically no spiral patterns.
The paper is smooth, and it is easy to pull out a stack of paper, while a stack of towels cannot be pulled out. If fly ash, slag, coal gangue, or waste bricks are appropriately added to the clay or soft shale mud, these angular mud materials can bite each other and reduce the layering of the mud, which will eliminate spiral lines or S-shaped cracks.