The main features of a multi-layer belt dryer for instant noodles are as follows:
**Suitable operating conditions can be set. Temperature, airflow, and other operating conditions can be adjusted arbitrarily according to the ventilation method and corresponding drying state.
**Freely adjustable post-processing moisture content. Because the material flow rate and residence time within the drying unit can be freely adjusted, the moisture content of the processed product can be arbitrarily set.
**Minimally damages shape. Materials move statically within the drying unit, minimizing damage to the product's shape. Even if a small amount of dust is present, it can be collected by installing a low-pressure airflow or a bag filter on the ductwork.
**Various conveyor belts can be used. Depending on the material being dried, in addition to various wire mesh conveyors, vibrating plates can also be used.
**Washable conveyor belts. The heating chamber and drying chamber are separated, facilitating the cleaning of the conveyor belt.
**Upon requirement, a cleaning device can be installed on the bottom plate of the equipment to scrape away any material that falls onto the bottom plate and transport it to the discharge end.
**Multiple units can be connected in series to increase output, depending on the production volume and material moisture content.** Having introduced the mesh belt dryer, let's now discuss some basic knowledge about it. First, let's look at its structure and heating methods.
A mesh belt dryer is a batch, continuous production drying equipment. The main heating methods include electric heating, steam heating, and hot air heating. Its main principle is to evenly spread the material on a mesh belt, which uses a 12-60 mesh steel wire mesh belt. Driven by a transmission device, the belt moves back and forth within the dryer. Hot air flows through the material, and water vapor is discharged from the exhaust vents, thus achieving the drying purpose. The length of the chamber is composed of standard sections. To save space, the dryer can be multi-layered, commonly with two chambers and three or five layers, a length of 6-40m, and an effective width of 0.6-3.0m.
The mesh belt dryer distributes the material to be processed onto the conveyor belt through an appropriate material spreading mechanism, such as a star-shaped distributor, a oscillating belt, a crusher, or a granulator. The conveyor belt passes through a channel composed of one or more heating units, each equipped with an air heating and circulation system. Each channel has one or more dehumidification systems. As the conveyor belt passes, hot air passes over the material on the conveyor belt from top to bottom or from bottom to top, thereby ensuring that the material is dried evenly.
