In the process of plastic injection molding, residual sprue in the mold nozzle is a common issue. If not removed in a timely manner, these sprues can affect production efficiency and product quality. So, what are the effective methods for removing these residual sprues? The following will provide you with a detailed introduction to several practical methods.

Firstly, a common and simple method is to use a copper rod for tapping. Specifically, tap the injection mold sprue gently with the tip of a thick copper rod on the inside of the plastic injection mold nozzle. When you feel the sprue move slightly, switch to a thin copper rod to carefully remove it. To deal with various situations, the injection molding machine should be equipped with several thin copper rods with diameters smaller than the nozzle and one thicker copper rod.

However, it should be noted that using a screwdriver or other hard tool instead of a copper rod can easily damage the plastic injection mold.

Secondly, if the sprue cannot be pierced out directly from the nozzle side, we can use the heating method. Specifically, heat the sprue to red with a wire and an alcohol lamp or other heater, and then pierce it into the sprue from the side of the plastic injection mold. After it has fully cooled, use pliers to grip and remove it. During this process, a brass plate (or cloth strip) must be placed at the lower end of the pliers to prevent damage to the injection mold when removing the sprue.

In addition, when the above methods cannot remove the sprue, we can try using a solvent dissolution method. Apply a solvent suitable for the material (such as acetone) to the sprue, wait for it to dissolve for a period of time, and then slowly remove it with a brass rod. However, during this process, be sure to keep away from fire sources to prevent danger.

Finally, after removing the sprue, don't forget to clean the nozzle hole of the plastic injection mold. You can use gas to blow it clean and spray with a release agent to ensure smooth and efficient subsequent production.

In summary, there are various methods for removing residual sprue from the nozzle of a plastic injection mold, and the specific method chosen should be based on the actual situation. I hope the above introduction can be helpful to you and make your plastic