How to solve the leakage problem of injection molds

1. The most common occurrence occurs at the joints of the mold cooling water pipes. If water leakage is found, a sealing tape should be wrapped around the threads of the pipe joints and then tightened.
2. Due to long-term molding conditions, the waterproof ring in the mold will be damaged, and the O-shaped waterproof rubber ring will easily harden and crack, resulting in water leakage. Poor installation of some waterproof rings can also cause sealing failure. Generally, the installation position and sealing performance of the sealing ring need to be checked regularly.
3. The wall of the cooling water hole is damaged. This often happens when trying out a new mold. The planned wall thickness is sufficient, but hole wall penetration occurs due to machining errors or post-processing. In most cases, leaking water holes can no longer be used.
4. Inspection and maintenance of cooling water holes. It is easy for scale to form in the cooling water holes, which hinders heat transfer. In severe cases, the waterway is blocked and requires regular maintenance. Regarding the linear water holes, a steel rod 0.5mm smaller in diameter than the cooling water hole can be inserted and struck with a hammer to remove scale and rust. Regarding the cooling water pipes embedded in the mold, the mold should be disassembled and rust removed.
After maintenance, a water leakage test should be carried out. Use a hand pump to fill the water hole with water and keep it under 2MPa pressure for 5 minutes. Check whether the water pressure drops to determine whether the water hole is leaking. Leakage can be blocked by mechanical fastening using rubber, cork and other elastic materials, and room temperature curing silicone can also be used as a sealing material.