A sandwich belt refers to the two parallel conveyor belts used in a sandwich conveyor system. These belts work together to securely hold and transport materials by creating a sandwich-like grip, ensuring that the materials do not slip or fall off during transport. The upper and lower belts move at the same speed, maintaining constant pressure on the material to facilitate smooth, continuous movement, even on steep inclines. The sandwich belt design is particularly effective for vertical and high-angle conveying, making it ideal for applications where space constraints and the need to elevate materials are significant considerations. Sandwich belts are often made from durable materials that can withstand the stress of holding and transporting heavy loads, and they are designed to handle a wide range of materials, from fine powders to large, coarse particles.