A water spray type pasteurizing and cooling tunnel sterilizing machine is a piece of equipment used in the food and beverage industry to sterilize and cool products such as bottles, cans, or packages. It is commonly used in the production of juices, soft drinks, dairy products, and other beverages.

The machine typically consists of a tunnel-like structure with a conveyor belt system that carries the products through various stages. Here is a general description of the process:

1. Loading Zone: The products are loaded onto the conveyor belt at the beginning of the tunnel, usually manually or with the help of automated systems.
2. Preheating Zone: The products enter a preheating zone where they are exposed to moderate heat to eliminate any initial microbial contamination. This helps prepare the products for the subsequent sterilization process.
3. Sterilizing Zone: In this zone, the products pass through a series of water spray nozzles that release hot water or steam under high pressure. The water or steam is sprayed onto the products, thoroughly wetting their surfaces. The high temperature of the water or steam kills or inactivates any bacteria, yeasts, molds, or other harmful microorganisms present on the product surfaces. The temperature and duration of this stage are carefully controlled to ensure effective sterilization while minimizing any adverse effects on the product quality.
4. Cooling Zone: After the sterilization process, the products enter a cooling zone. Here, they are exposed to a controlled flow of cool water or chilled air to rapidly cool their surfaces and bring them to a safe temperature for packaging. This cooling process helps maintain product quality and prevents any possible recontamination.
5. Unloading Zone: Finally, the products are unloaded from the conveyor belt, either manually or with the help of automated systems, and sent for packaging or further processing.

The water spray type pasteurizing and cooling tunnel sterilizing machine is designed to ensure efficient sterilization and cooling of products while maintaining their quality attributes. The specific design and features of the machine may vary depending on the manufacturer and the specific requirements of the food or beverage industry.