In addition to basic equipment such as chillers, air compressors, and conveyor belts, various specialized auxiliary systems are required to meet the diverse product characteristics and quality requirements. This is especially critical for large containers and products with strict quality requirements. Here, we introduce three key types of equipment: rotary cutters for open-top drums, post-cooling equipment, and leak testers.

1. Rotary Cutter for Open-top Drums
Open-top drums (such as chemical drums and water storage tanks) require the removal of flash from the neck and bottom after molding. While the bottom flash is removed manually, a rotary cutter is necessary to ensure the neck reaches the specified dimensions with a smooth, flat cut. Utilizing high-speed rotating blades paired with automatic positioning devices, this equipment precisely trims excess waste from the drum mouth.

The dimensions are adjustable to the product's neck size, offering advantages such as high precision, high efficiency, and strong consistency. For drums that require matching lids, the flatness of the cut is crucial.

2. Post-Cooling (Secondary Cooling Equipment)
During blow molding, although products undergo initial cooling within the mold, the temperature difference between the surface and the interior of large or thick-walled products can still cause deformation or uneven shrinkage. The Post-Cooling System is a vital extension of the cooling process. Typically used after the product is removed from the mold, it provides uniform cooling to the finished part. This method not only reduces molding cycle times and increases production efficiency but also strengthens product quality, reducing the likelihood of subsequent deformation or degradation.

This equipment features custom fixtures that secure the product and use cold air to cool it, effectively lowering the surface temperature and allowing internal heat to be released more evenly. This minimizes the risk of warping, shrinkage, and deformation, making it particularly suitable for containers over 20L and automotive plastic parts with high aesthetic and dimensional requirements.

3. Leak Tester and Driller
For hollow containers, airtightness is a fundamental and critical quality indicator—especially for plastic drums and bottles used for liquids, oils, or chemicals. The leak tester is an automated device designed specifically for this rigorous inspection.

The leak tester primarily determines whether a product has holes or thin walls by injecting air and monitoring pressure changes. It effectively eliminates defective items, ensuring every product meets sealing standards. For continuous multi-cavity or high-volume production lines, leak testers are usually connected to conveyor lines to automatically complete sampling, testing, and sorting. If a non-conforming product is detected, it is immediately rejected to a scrap area without manual intervention. For accumulator-type leak testers and drillers, robotic arms can also be employed to achieve full automation.

Conclusion
In summary, rotary cutters, post-cooling equipment, and leak testers address the three critical stages of post-processing: finishing, dimensional stability, and airtightness testing. Implementing these auxiliary systems not only enhances the quality and consistency of molded products but also helps build automated, high-efficiency modern blow molding production lines, exerting a profound impact on industrial upgrading and product competitiveness.