Drooling is a common issue that cannot be ignored in the meticulous process of plastic injection molding, particularly when using open gate designs. This article delves into the key factors that trigger drooling and provides targeted solutions to help you optimize your production process and enhance product quality.
The Curse of Overheating: Excessive temperatures at the hot tip or in the melt exacerbate the plastic's fluidity, leading to drooling.
The Dilemma of Insufficient Cooling: If the gate area is not adequately cooled, the melt fails to solidify promptly, also contributing to drooling.
The Loss of Pressure Release: Improper pressure release during the injection molding process can similarly induce drooling.
The Error in Time Control: Excessive hold time or injection time, like too much of a good thing, is also a significant cause of drooling.
The Hazard of Gate Damage: Failure to promptly replace or repair damaged, worn, or corroded gates can also trigger drooling.
In more precise needle valve gate systems, drooling issues can also arise from incorrect actuation times or fundamental piston function failures. To address this, we need to focus on the following two adjustments:
Precise Timing Adjustment: Thoroughly check and adjust actuation times to ensure proper sealing and avoid leakage due to timing errors.
Component Status Check: Regularly inspect the wear of the valve needle and valve bushing, as well as the system pressure. If wear or low pressure is detected, immediately clean the valve bushing and replace the seals to maintain system tightness.
Furthermore, it's important to note that excessively prolonged hold times and injection times not only exacerbate drooling but can also cause gate stringing. Therefore, reasonable control of these two time parameters is crucial for preventing drooling.
In summary, while the issue of drooling in plastic injection molding may seem complex, through precise temperature control, adequate cooling, proper pressure release, accurate time management, and regular component inspection and maintenance, we can effectively tackle this challenge and ensure both the quality and production efficiency of injection molded products. In the pursuit of excellence, every detail optimization is key to success.
