Plastic injection molding remains the most adaptable and versatile of all the plastic molding techniques. Injection molding machines come in a number of sizes and tonnages, as well as pressure ratings. A variety of plastic resins and a wide range of additives are widely used material options to modify the physical properties of final parts.

Mold Removal

The molding machine closes the mold and applies clamp pressure in the most specific application. The computer tracks how much pressure it applies in the specified time as a safety check. There may also be a closing profile, where the machine operator sets different speeds as the mold closes, depending on the machine. When molds become more complex, this setting is more widely used.


The machine screw advances during injection time, forcing molten plastic out of the barrel and into the mold cavities. Bear in mind that injecting too quickly or too slowly will result in a number of component defects. Even though it seems to be a simple operation, it is far more complicated. When plastic enters specific areas on a component, a maker may slow down or speed up the screw speed as needed. When it comes to delivering high-quality, reliable goods, this degree of control will make all the difference.

Keep And Pack

When the part is almost finished, it's time to pack it out the rest of the way and keep material pressure on the gates until they freeze. It's crucial that the gate design and size are properly matched to the component. The gates must then cool enough to separate the component from the feed system.

Plasticizing And Cooling

The part is filled out after the pack and hold point, but it is still too hot to remove from the mold. The time allocated for the mold to absorb heat from the plastic component is referred to as cooling down. The molding machine starts recharging material in the barrel during this part to prepare for the next cycle. The screw starts spinning again, and raw material is conveyed down the barrel. The screw is moved backward as the plastic material moves.

Ejection of Completed Pieces

The pieces must be removed from the mold after it has been opened. This stage could be as simple as a single mold ejection pulse, or it could require multiple ejection strokes and advanced robotics. If the machine is fitted with robotics, the robot can instruct the molding machine to begin the ejection operation.

We have completed a full cycle of the injection molding process when the pieces are removed from the mold. Mold operation and component design dictate the speed of each loop. However, depending on the size of the task, the entire process may take seconds or minutes. Preparation of the molding material, mold cooling temperature, barrel temperatures, integrated robotics, hot runner device power, and other changeable molding machine components would be among the other variables.