Brief introduction to the molding process of fiber cement board

Molding process belongs to the semi-dry molding process, molding process to produce fiber cement products (anti-explosion board, plank board, silicate fire-proof board, etc.) refers to the premise of adding water to meet the cement hydration water consumption in the mixture, as little as possible to use water to make cement, other components, reinforcement fiber, etc., after mixing to achieve a dry and hard state, that is, "hand pinched into a group, landing to flower". After paving, molding and locking the mold frame, the cementitious material in the slab is condensed and cured under pressure, and then the mold is removed and maintained for post-processing.

Compared with the traditional wet molding process, the molding process is characterized by: simple operation process, low waste rate, less industrial water consumption; The fiber is distributed in three dimensions in the cement substrate, the homogeneity of the product is good, and the fiber utilization rate is lower than that of the wet method. Production line does not need to consume a lot of process water, because there is no need to use a huge waste water recovery and treatment system, plate production energy consumption is low; Slab in the mold frame pressure molding, the product density is high, high strength; The plate is broken for a pressing molding, the whole plate is broken for a uniform whole, the durability of the product is good.

Due to the special mold frame locking maintenance process of the molding method, the production cycle of the molding method is long. In order to achieve the initial strength of the product, the product should be maintained for 5~8h under the condition of 60~80℃; Many auxiliary facilities of production line, large initial investment, mold frame pad and pad transportation, cleaning and locking device maintenance, will occupy a large workshop maintenance area; The products produced by molding method are stacked and produced in batches, and the plate has a large tolerance in the thickness direction. The subsequent process needs to sanding the plate, which is not suitable for the production of complex products.

Due to the stable production equipment and reliable product quality, the molding method is widely used in the production of fiber cement products in Holland, Germany, Sweden and other countries. After years of improvement of equipment, improvement of pavement forming quality and the development of electromechanical integration and precise program control, the molding method can industrialize the production of 8~40mm thick plates.