{"id":455,"date":"2026-09-14T12:34:38","date_gmt":"2026-09-14T04:34:38","guid":{"rendered":"http:\/\/www.dipobisnis.com\/blog\/?p=455"},"modified":"2026-09-14T12:34:38","modified_gmt":"2026-09-14T04:34:38","slug":"how-to-prevent-over-injection-in-a-dual-station-vertical-injection-molding-machine-4293-eabb40","status":"publish","type":"post","link":"http:\/\/www.dipobisnis.com\/blog\/2026\/09\/14\/how-to-prevent-over-injection-in-a-dual-station-vertical-injection-molding-machine-4293-eabb40\/","title":{"rendered":"How to prevent over – injection in a Dual – Station Vertical Injection Molding Machine?"},"content":{"rendered":"

As a supplier of Dual-Station Vertical Injection Molding Machines, I understand the challenges that come with operating these complex pieces of equipment. One common issue that many users face is over – injection, which can lead to a variety of problems such as poor part quality, increased material waste, and potential damage to the machine itself. In this blog post, I will share some practical strategies on how to prevent over – injection in a Dual – Station Vertical Injection Molding Machine. Dual-Station Vertical Injection Molding Machine<\/a><\/p>\n

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Understanding Over – Injection<\/h3>\n

Before delving into prevention methods, it’s essential to understand what over – injection is. Over – injection occurs when an excessive amount of molten plastic is injected into the mold cavity during the molding process. This can happen due to various reasons, including inaccurate setting of injection parameters, malfunctioning of the injection system, or improper mold design.<\/p>\n

When over – injection occurs, the excess plastic can cause the mold to be over – filled, leading to flash (a thin layer of plastic that extends beyond the part’s intended shape). Flash not only affects the appearance of the final product but also requires additional post – processing steps to remove, increasing production time and cost. Moreover, over – injection can put excessive stress on the mold and the machine, potentially leading to premature wear and tear.<\/p>\n

Precise Parameter Setting<\/h3>\n

One of the most effective ways to prevent over – injection is to set the injection parameters accurately. Here are some key parameters to consider:<\/p>\n

Injection Volume<\/h4>\n

The injection volume is the amount of molten plastic that is injected into the mold cavity. It should be carefully calculated based on the volume of the mold cavity and the shrinkage rate of the plastic material. To determine the correct injection volume, you can start by making test shots with a small amount of plastic and gradually increasing the volume until the part is fully formed without any signs of over – injection.<\/p>\n

Most modern Dual – Station Vertical Injection Molding Machines are equipped with advanced control systems that allow for precise adjustment of the injection volume. These systems can also store different sets of parameters for different products, making it easier to switch between production runs.<\/p>\n

Injection Speed<\/h4>\n

The injection speed refers to how fast the molten plastic is injected into the mold cavity. A too – high injection speed can cause the plastic to flow too quickly, leading to over – injection and flash. On the other hand, a too – low injection speed can result in incomplete filling of the mold.<\/p>\n

The optimal injection speed depends on several factors, such as the type of plastic material, the complexity of the mold design, and the size of the part. In general, it’s a good practice to start with a relatively low injection speed and then gradually increase it while monitoring the molding process. You can also use the machine’s control system to adjust the injection speed in real – time during the molding process.<\/p>\n

Injection Pressure<\/h4>\n

Injection pressure is another critical parameter that affects the injection process. It is the force applied to the molten plastic to push it into the mold cavity. If the injection pressure is too high, it can cause over – injection. Conversely, if the pressure is too low, the mold may not be filled completely.<\/p>\n

To set the correct injection pressure, you need to consider the viscosity of the plastic material and the resistance of the mold cavity. You can start by referring to the material manufacturer’s recommendations for the appropriate injection pressure range. Then, through trial and error, you can fine – tune the pressure to achieve the best results.<\/p>\n

Regular Machine Maintenance<\/h3>\n

Proper maintenance of the Dual – Station Vertical Injection Molding Machine is crucial for preventing over – injection. Here are some maintenance tasks that should be carried out regularly:<\/p>\n

Inspection of the Injection System<\/h4>\n

The injection system, including the screw, barrel, and nozzle, should be inspected regularly for wear and tear. A worn – out screw or barrel can cause inconsistent plasticization and injection, leading to over – injection. If any parts show signs of excessive wear, they should be replaced immediately.<\/p>\n

The nozzle should also be checked for blockages or leaks. A blocked nozzle can cause a build – up of pressure, resulting in over – injection, while a leaking nozzle can lead to inaccurate injection volume.<\/p>\n

Lubrication of Moving Parts<\/h4>\n

The moving parts of the machine, such as the tie bars, guide rails, and toggle mechanisms, need to be lubricated regularly. Proper lubrication reduces friction and ensures smooth operation of the machine. If the moving parts are not lubricated properly, the machine may not function as intended, which can affect the injection process and potentially lead to over – injection.<\/p>\n

Calibration of Sensors and Controls<\/h4>\n

The sensors and controls on the machine are responsible for monitoring and adjusting the injection parameters. Over time, these sensors and controls may become inaccurate, leading to incorrect parameter settings and over – injection. Therefore, they should be calibrated regularly to ensure their accuracy.<\/p>\n

Mold Design and Maintenance<\/h3>\n

The design and maintenance of the mold also play a significant role in preventing over – injection.<\/p>\n

Proper Mold Design<\/h4>\n

A well – designed mold should have a balanced runner system that distributes the molten plastic evenly into the mold cavity. This helps to ensure that all parts of the cavity are filled simultaneously, reducing the risk of over – injection.<\/p>\n

The gate size and location also need to be carefully selected. A too – large gate can cause the plastic to flow too quickly into the mold, while a poorly located gate can lead to uneven filling.<\/p>\n

Regular Mold Maintenance<\/h4>\n

The mold should be cleaned and maintained regularly. Any debris or residue in the mold cavity can affect the flow of the molten plastic and cause over – injection. The mold should also be inspected for any signs of damage, such as cracks or wear, and repaired or replaced as needed.<\/p>\n

Operator Training<\/h3>\n

Finally, proper operator training is essential for preventing over – injection. Operators should be familiar with the machine’s operation, including how to set the injection parameters correctly. They should also be trained to recognize the signs of over – injection, such as flash or excessive stress on the mold, and take appropriate corrective actions.<\/p>\n

Our company offers comprehensive training programs for operators of our Dual – Station Vertical Injection Molding Machines. These programs cover everything from basic machine operation to advanced troubleshooting techniques, ensuring that your operators are well – equipped to prevent over – injection and other issues.<\/p>\n

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In conclusion, preventing over – injection in a Dual – Station Vertical Injection Molding Machine requires a combination of precise parameter setting, regular machine maintenance, proper mold design and maintenance, and operator training. By following these strategies, you can improve the quality of your molded parts, reduce material waste, and extend the lifespan of your machine.<\/p>\n

Slide Table Vertical Injection Moulding Machine<\/a> If you are interested in purchasing a Dual – Station Vertical Injection Molding Machine or need further information on how to prevent over – injection, please feel free to contact us for a procurement discussion. Our team of experts is ready to assist you in finding the best solution for your production needs.<\/p>\n

References<\/h3>\n