In industrial production, it is crucial to avoid cross contamination when the central feeding system processes multiple materials.

Firstly, the use of independent conveying pipelines is one of the key measures for the system. For each material, there are specially designed pipelines, and the material selection of these pipelines will be based on the chemical properties of the material. For example, for acidic materials with strong corrosiveness, acid resistant plastic pipes will be selected; For materials with certain particle size, metal pipes with smooth inner walls will be used to reduce material residue and wear. Moreover, the pipelines are independent of each other and have a clear layout, which avoids contact between different materials at the source and transportation path.

Secondly, in the material storage process, the central feeding system is equipped with multiple dedicated silos. The structural design of each silo is reasonable and has good sealing performance. For example, in the food processing industry, in order to prevent contamination between raw materials with different flavors or ingredients, the silo is equipped with specialized sealing covers and exhaust devices, allowing each material to be stored in a separate space. At the same time, there will be anti caking, moisture-proof and other designs inside the silo to ensure the original state of the materials. There will also be corresponding isolation devices at the inlet and outlet to ensure that no other materials are mixed in when one material enters or exits.

Furthermore, cleaning procedures are essential for preventing cross contamination. The system will perform a thorough cleaning every time the material variety is changed. This includes cleaning of pipelines and cleaning of silos. Pipeline cleaning can be carried out using high-pressure air blowing, specialized cleaning solution flushing, and other methods. For example, in the chemical industry, after transporting a chemical raw material that is prone to residue, the pipeline is first rinsed with a cleaning solution that can dissolve the raw material, then rinsed with clean water, and finally dried with high-pressure dry air to ensure that there is no residue in the pipeline. The silo will be cleaned manually or mechanically to remove residual materials from the walls and bottom of the silo.

In addition, the central feeding system can also adopt automation control technology. Accurately control the conveying sequence and time of materials through sensors and intelligent control systems. For example, after a material is transported, the system will automatically detect the residual material in the pipeline. Only after confirming cleanliness or no residue, will the next material be transported to avoid cross contamination in the operation process.