In the injection molding production process, hot runner molds are widely favored for their efficiency and energy-saving characteristics. However, operators are often plagued by system leakage issues, directly impacting product quality and production efficiency. This article delves into the various potential causes of leakage in hot runner molds during operation from multiple dimensions and offers professional insights from Dongguan Yize Mold Co., Ltd. to safeguard your production.
I. Improper Adjustment of Support Blocks
Drawbacks of Being Too Low: When support blocks are set too low, a slight gap can easily form between the runner plate and the hot nozzle under injection pressure, becoming a breeding ground for leakage.
Concerns of Being Too High: Conversely, if the blocks are too high, they may intrude into the front mold baseplate. Under the dual pressure of injection and mold clamping, the runner plate is pushed to one side, likewise triggering leakage.
II. Imbalance in Center Block Height
Consequences of Being Too High: If the center block is too high, the runner plate rests directly on it, causing an undesired gap between the runner plate and the hot nozzle, leading to leakage.
Problems of Being Too Low: A block that is too low may collapse under injection pressure, causing the runner plate to bend and deformation, resulting in leakage issues.
III. Variations in Hot Nozzle Height
Hot nozzles with uneven heights, particularly those positioned lower, are more prone to becoming "hot spots" for leakage, requiring special attention to their installation accuracy.
IV. Excessive Distance Between Fixing Screws
When the distance between screws and the runner plate or hot nozzle is too wide, it weakens the sealing performance, providing an opportunity for leakage.
V. Mistakes in Locating Pin Height
If the locating pin is too high, it can separate the runner plate from the hot nozzle, creating a gap that directly leads to leakage.
VI. Overly Long Hot Nozzle Design
A hot nozzle that is designed too long will limit its expansion space, increasing internal pressure and causing the sealing ring to fail, making leakage inevitable.
VII. Inappropriate Sealing Ring Dimensions
Drawbacks of Being Too High: A sealing ring that is too high can easily cause the runner plate to deform under pressure, increasing the risk of leakage.
Concerns of Being Too Low: If it is too low, there will be insufficient initial compressive force, and as the hot runner system heats up, leakage becomes more severe.
VIII. Incorrect Hot Nozzle Positioning
Incorrect positioning of the hot nozzle, such as when the countersunk head is mistakenly installed on the front mold or front mold insert, can cause the mold clamping force to be incorrectly transferred to the front mold cavity during injection pressure or thermal expansion, inducing leakage.
Conclusion
Precision diagnosis and adjustment are crucial when facing the challenge of leakage in hot runner molds. Established in 2007, Dongguan Yize Mold Co., Ltd. has deep experience in precision mold design and manufacturing, particularly in areas such as automotive connectors, medical product injection molding, cleanroom injection molding, and PFA custom injection molding. We provide a comprehensive range of solutions from product design, mold manufacturing, injection molding, to assembly and after-sales service. If you are facing hot runner mold leakage or other related issues, please call +86 13302615729 (WeChat, WhatsApp same number). Yize Mold is committed to serving you and creating a better future together.
