In the injection molding production process, hot runner molds are widely favored for their high efficiency and energy-saving characteristics. However, the problem of system leakage often troubles operators, directly affecting product quality and production efficiency. This article will analyze the possible causes of glue leakage in the use of hot runner molds from multiple dimensions, and provide a professional perspective from Dongguan Yize Mold Co., Ltd. to escort your production.
1. Improper adjustment of support pads
Disadvantages of too low: When the support pad is set too low, a small gap is easily generated between the runner plate and the hot nozzle under the injection pressure, which becomes a hotbed for glue leakage.
Risk of too high: On the contrary, if the pad is too high, it may invade the bottom plate of the front mold. Under the dual pressure of injection molding and clamping, the runner plate is pushed to one side, which also causes glue leakage.
2. Imbalance in the height of the center pad
Too high causes: The center pad is too high, and the runner plate is directly placed on it, resulting in an unnecessary gap between the runner plate and the hot nozzle, and glue leakage follows.
The problem of being too low: If the pad is too low, it may collapse under the injection pressure, causing the runner plate to bend and deform, and the problem of glue leakage comes into being.
3. Difference in hot nozzle height
The hot nozzle height varies, especially the low hot nozzle, which is more likely to become the “hardest hit area” of glue leakage, and special attention should be paid to its installation accuracy.
4. The spacing between the fixing screws is too large
The distance between the screw and the runner plate or hot nozzle is too wide, which weakens the sealing performance and provides an opportunity for glue leakage.
5. Incorrect positioning pin height
If the positioning pin is too high, the runner plate and the hot nozzle will separate, forming a gap, which directly leads to glue leakage.
6. The hot nozzle design is too long
If the hot nozzle design is too long, it will limit its expansion space, increase the internal pressure, cause the sealing ring to fail, and glue leakage is inevitable.
7. Improper sealing ring size
The disadvantage of being too high: If the sealing ring is too high, it is easy to cause the runner plate to deform under force, increasing the risk of glue leakage.
Too low worry: If it is too low, the initial clamping force is insufficient. As the hot runner system heats up, the glue leakage problem becomes more serious.
8. Incorrect hot nozzle positioning and installation
Improper hot nozzle positioning, such as the countersunk head is incorrectly installed on the front mold or the front mold insert, the clamping force is incorrectly transmitted to the front mold core during injection pressure or thermal expansion, inducing glue leakage.
Conclusion
Facing the challenge of glue leakage in hot runner molds, accurate diagnosis and adjustment are essential. Dongguan Yize Mould Co., Ltd. has been deeply involved in the field of precision mold design and manufacturing since its establishment in 2007, especially in automotive connectors, medical product injection molding, dust-free injection molding, PFA custom injection molding and other aspects. We provide a full range of solutions from product design, mold manufacturing, injection molding to assembly and after-sales, and are committed to solving every problem in production for customers. If you are facing glue leakage or other related problems in hot runner molds, please call 13302615729 (WeChat and WhatsApp are the same number), Yize Mould will serve you wholeheartedly and create a better future together.
