These molds are primarily used for producing slope protection bricks for high-speed railways and dams. Plastic slope protection molds are generally made of engineering polypropylene plastic and injection molded using an injection molding machine. Common shapes include rectangular, hexagonal, herringbone, chevron, and arched slope protection bricks. Slope protection bricks are mainly used in dams to prevent soil erosion. Concrete is placed inside the mold, vibrated on a vibrating table, and after the cement solidifies, a cement slope protection brick is formed. Slope protection brick injection molds are mainly used in the production of highway slope protection bricks and dam cement slope protection bricks. Concrete is filled into the mold box, vibrated, and after natural solidification and drying, it is demolded and ready for use.
Engineering plastics have seen rapid development in the field of slope protection molds in recent years. Common materials include polypropylene (PP), polyethylene (PE), and reinforced nylon. These materials have low density and are lightweight, making them easy to handle and install, significantly reducing manual labor intensity. At the same time, plastic molds have smooth surfaces, good demolding performance, and produce concrete slope protection blocks with a neat appearance and high dimensional accuracy. Some high-performance engineering plastics also possess certain anti-aging and weather-resistant properties, allowing for long-term outdoor use. Furthermore, plastic molds are not prone to rust, are easy to maintain and clean, making them suitable for small to medium-scale on-site prefabrication operations. However, their rigidity is relatively weaker than metals, and they may undergo slight deformation under high-temperature environments; therefore, careful storage and usage conditions are necessary in extreme climates.