Injection molding processing melt backflow? Professional answer is here!

In the process of injection molding processing, melt reflux is a common phenomenon, it will lead to product quality decline, and may even damage the mold and machine. Therefore, it is necessary to have enough understanding of this problem and master the corresponding solutions.

What is melt backflow in injection molding process? Simply put, it means that after the plastic is melted and injected into the mold, part of the melt does not flow according to the predetermined path, but reverses the flow to where it should not go, such as nozzles, barrels and other parts. This phenomenon usually causes product defects, machine breakdowns and other problems.

How to avoid or solve the problem of reverse flow of melt? Here are some effective methods:

1. Choose suitable injection speed and pressure: If the injection speed is too fast or the pressure is too high, it may lead to melt reflux. Therefore, you need to adjust the appropriate injection speed and pressure according to the specific products and materials.

2. Ensure reasonable mold design: The design of the mold directly affects the flow of the melt. If the mold design is not reasonable, it may produce eddy current or dead space, resulting in melt backflow. Therefore, it is necessary to design the mold county with full consideration of the flow of the melt to ensure the smoothness of the mold.

3. Use the right material: different plastic materials have different fluidity, choosing the right material can reduce the possibility of melt reflux.

4. Control the temperature of the barrel: If the temperature of the barrel is too high, the melt will be too thin and backflow will easily occur. On the contrary, if the temperature is too low, the fluidity of the melt will be reduced, which may also lead to backflow. Therefore, it is necessary to adjust the temperature of the barrel according to the specific situation.

5. Regular cleaning of barrels and nozzles: Impurities in the barrels and nozzles may hinder the normal flow of melt and lead to backflow. Therefore, these parts need to be cleaned regularly to ensure that they are clean and free of impurities.

6. Checking and adjusting the parameters of the injection molding machine: If certain parameters of the injection molding machine are not set properly, it may also cause backflow of the melt. Therefore, these parameters need to be checked and adjusted regularly to ensure that they are within reasonable limits.

These methods above do not exist in isolation, but are interrelated. In the actual operation of injection molding processing, it is often necessary to consider a variety of factors in order to effectively solve the problem of melt backflow. At the same time, it is also necessary to accumulate experience and improve understanding of the injection molding process in order to better prevent and deal with such problems.