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How to run a plastic injection molding machine?

2024/06/05 By 兰兹

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How to run a plastic injection molding machine?

This guide can inspire and instruct manufacturers or operators unfamiliar with operating plastic injection molding machine. In this guide, divided into five parts, I will introduce you to how to operate plastic injection molding machines individually, taking you through some of the details and setup processes that need to be understood in detail to run these machines.

Getting Started: Setting Up Your Plastic Injection Molding Machine

You must set up your plastic injection molding machine correctly before running it. This is the stage when you have just received the machine and put it into production for the first time. First, you must ensure the machine is clean and has no material residue. Check the molds to ensure they are in good condition and installed correctly.

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Next, check the hydraulic and electrical systems of the plastic injection molding machine. Ensure all connections are secure and there are no leaks in the hydraulic system. Verify that the power supply meets the machine’s requirements and that all safety mechanisms are in place. Check that the control panel of the machine is functioning as it should. And make sure that the connections with the surrounding injection molding robots and auxiliary equipment such as the mould temperature controller are normal. Load the appropriate type of plastic resin into the hopper. Once everything is ready, you can turn on the machine and start preheating the mold to the required temperature.

Programming the Plastic Injection Molding Machine

It’s time to program the plastic injection molding machine. You need to set the injection parameters, including injection speed, pressure, and time. You must adjust these parameters according to the type of plastic resin you are using and the complexity of the mold. The next step is to set the clamping force. The clamping device holds the two halves of the mold together during injection. Balance the force to avoid excess or insufficient amounts.

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Then, the cooling time is set, determining how long the molded part stays in the mold to cool and solidify. Finally, the ejection system is programmed. The ejection parameters, including ejection speed and force, must be accurately set to avoid damaging the part or the mold. These related parameters can be set and operated through the control panel.

Monitor the Injection Process

As a plastic injection molding machine operator, you must observe the injection phase to ensure that the plastic resin flows smoothly into the mold cavity without interruptions, such as short shots or flashes. Keep a close eye on the pressure gauge and control panel. Pressure should remain within the set parameters throughout the injection molding process, and any major deviations may indicate a problem with the machine or material.

During the cooling phase, monitor cooling time and temperature to ensure that the part cools evenly. Uneven cooling can cause warping or other dimensional inaccuracies. Observe the ejection process to ensure that you eject the molded part smoothly without causing any damage. If the part sticks to the mold or shows signs of deformation, adjust the ejection parameters or apply a release agent.

Maintenance and troubleshooting

Modern plastic injection molding machines are basically perfect in function and mechanism and do not require much maintenance, but they still need regular maintenance occasionally. This also ensures that the plastic injection molding machine has a long service life and optimal performance. Daily life includes cleaning the machine, checking for leaks, and checking the mold for wear. Perform a more thorough monthly inspection of the hydraulic and electrical systems. Check the oil level and quality of the hydraulic oil, replace it if necessary, and calibrate the sensors and control system regularly.


If some problems occur. Examples include inconsistent part quality, excessive burrs, or machine downtime. This could be related to machine setup, material, or mold. For example, a common problem of excessive flash could be caused by insufficient clamping force or damage to the mold surface. This problem can be solved by adjusting the clamping force or repairing the mold.

Optimize production efficiency

After setting up and monitoring the injection molding process, you can also optimize production efficiency, which is crucial to improving the output and profitability of plastic injection molding machines. In the series of plastic injection molding machines of Topstar, the comprehensive upgrade of the design of injection, clamping, hydraulic system, etc., has increased their overall efficiency by 15%, and they perform better when facing complex structures and specific materials. One way to improve efficiency is to optimize the cycle time. Reducing the cycle time without affecting product quality can significantly increase production. Try different parameters and settings to find the best cycle time for your specific application.

Master the best way to operate

Operating a plastic injection molding machine requires an understanding of its mechanics, setup, precise programming, and a focus on optimizing production efficiency. With the best practices outlined in the guide, you can ensure your machine operates optimally and efficiently in your daily production to provide high-quality products.

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