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Functions of a vacuum calibration water tank


A vacuum calibration water tank is a crucial component in the extrusion process, specifically in the production of plastic pipes and profiles. Its primary function is to shape and cool the extruded plastic material, ensuring that the final product meets the desired specifications and dimensions. Here's an overview of the features and functions of a vacuum calibration water tank in the context of plastic extrusion:

1. Purpose:

  - The vacuum calibration water tank is used to shape and cool plastic extrudates (such as pipes or profiles) immediately after they exit the extruder. It plays a critical role in setting the dimensions, reducing internal stresses, and imparting stability to the extruded product.

2. Key Components:

  - Water Tank: The tank itself is a long, rectangular or cylindrical structure filled with water. It typically has multiple chambers to allow for gradual cooling and shaping of the plastic product.

  - Vacuum System: The vacuum calibration tank is equipped with a vacuum system that removes air from the water, creating a vacuum environment around the extruded plastic. This vacuum helps in achieving more precise shaping and improved product quality.

  - Water Circulation System: A water circulation system is employed to maintain a consistent temperature in the tank. The temperature of the water can be adjusted to control the cooling rate of the extruded product.

  - Guides and Supports: The tank may have guides and supports to ensure proper alignment and support for the extruded material as it passes through the water.

3. Operation:

  - The extruded plastic product enters the vacuum calibration water tank immediately after leaving the die head of the extruder.

  - The vacuum is applied around the product, removing air and facilitating better contact between the plastic and the cooling water.

  - The water in the tank is maintained at a controlled temperature, which varies depending on the type of plastic being extruded.

  - The plastic product travels through the tank, undergoing shaping and cooling processes. The vacuum helps in achieving precise dimensions and minimizing internal stresses.

  - After passing through the water tank, the extruded product enters a haul-off unit, which pulls it at a controlled speed to maintain uniform dimensions.

4. Advantages:

  - Dimensional Accuracy: The vacuum calibration water tank helps in achieving precise dimensions, especially in the case of plastic pipes and profiles that require tight tolerances.

  - Reduced Internal Stresses: Rapid and uniform cooling under vacuum conditions minimizes internal stresses in the extruded product, leading to improved product quality.

  - Enhanced Surface Finish: The cooling and shaping processes in the water tank contribute to a smooth and consistent surface finish on the extruded plastic.

5. Applications:

  - Vacuum calibration water tanks are commonly used in the production of plastic pipes, profiles, and other extruded products where dimensional accuracy and consistent quality are critical.

In summary, the vacuum calibration water tank is a vital component in the extrusion process, contributing to the production of high-quality plastic pipes and profiles. It plays a key role in shaping and cooling the extrudate, ensuring that the final product meets the required specifications and standards.

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