Plastic Injection Molding Machine Maintenance: Tips and Tricks for Longevity!

Plastic Injection Molding Machine Maintenance Tips and Tricks for Longevity!

Plastic injection molding machines are a vital tool in the manufacturing industry, as they allow for the production of high-quality plastic parts with great precision and efficiency. However, like any other machinery, these machines require regular maintenance to ensure their longevity and optimal performance. In this blog post, we will explore the importance of plastic injection molding machine maintenance and provide valuable tips for effective maintenance practices.

Understanding Plastic Injection Molding Machine

Before delving into the maintenance aspect, it is essential to have a basic understanding of how plastic injection molding machines work. These machines operate by melting plastic pellets and injecting the molten material into a mold cavity to create the desired shape. The plastic is then cooled and solidified, and the mold is opened to release the finished product.

Plastic injection molding machines consist of several key components that work together to carry out the molding process. The main components include the hopper, where the plastic pellets are fed into the machine; the barrel, which heats and melts the plastic; the screw, which pushes the molten plastic into the mold; and the mold, which shapes the plastic into the desired form.

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Common Maintenance Issues

Plastic injection molding machines are widely used in various industries for manufacturing plastic products. These machines play a crucial role in the production process, but like any mechanical equipment, they are susceptible to wear and tear. Regular maintenance is essential to ensure optimal performance and prolong the lifespan of these machines. In this blog post, we will discuss some common maintenance issues of plastic injection molding machines and provide useful tips to address them effectively. Some of the common maintenance issues include:

Heating System Malfunctions:

The heating system in an injection molding machine is responsible for melting the plastic resin. Over time, issues like heating element failure, temperature fluctuations, and clogged nozzles can arise. Regularly inspecting and cleaning the heating system is necessary to prevent these problems. If any components are damaged or worn out, they should be promptly replaced to maintain consistent and accurate temperature control.

Hydraulic System Problems:

The hydraulic system in injection molding machines is responsible for the movement of the mold and the injection of molten plastic. Common issues include leakage, insufficient pressure, and contamination in the hydraulic fluid. Regularly checking the hydraulic system for oil leaks, maintaining the correct fluid level, and changing the hydraulic oil at recommended intervals are crucial steps to prevent system failure.

Mold Maintenance:

The mold is a critical component of the injection molding process. It is prone to wear and tear due to constant use. Common mold maintenance issues include surface defects, warping, and sticking. To prevent these problems, regular cleaning, lubrication, and inspection of the mold are necessary. Additionally, identifying and addressing any design flaws or damage in the mold can help avoid costly production delays and defective products.

Electrical System Faults:

The electrical system of an injection molding machine controls various functions, including temperature, pressure, and timing. Issues such as faulty wiring, loose connections, and component failures can lead to machine malfunctions and safety hazards. Regularly inspecting the electrical system, tightening loose connections, and replacing damaged components are essential to prevent electrical failures and ensure operator safety.

Wear and Tear of Moving Parts:

The continuous movement of the machine’s components can lead to wear and tear over time. Regularly lubricating the moving parts, such as guide rods, ball screws, and tie bars, is necessary to reduce friction and prevent premature failure. Additionally, monitoring and replacing worn-out parts, such as seals, bearings, and belts, are crucial to maintain the machine’s performance and accuracy.

Nozzle blockages or leaks:

The nozzle is responsible for injecting the molten plastic into the mold. Blockages or leaks can disrupt the molding process and lead to defective parts. Regular cleaning and inspection of the nozzle can prevent such issues.

Wear and tear on moving parts:

The constant movement and high-pressure operations of plastic injection molding machines can cause wear and tear on critical components such as screws, barrels, and molds. Timely inspection and replacement of worn-out parts are necessary to maintain optimal performance.

Electrical or hydraulic system malfunctions:

Plastic injection molding machines rely on electrical and hydraulic systems for their operation. Any malfunction in these systems can result in production delays or complete machine breakdown. Regular maintenance checks should include inspecting electrical connections, hydraulic hoses, and fluid levels to ensure smooth operations.

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Tips for Effective Maintenance

To keep your plastic injection molding machine in top condition and prevent unnecessary downtime, it is crucial to follow effective maintenance practices. Here are some valuable tips:

A. Regular Cleaning and Lubrication

One of the most fundamental maintenance practices for plastic injection molding machines is regular cleaning and lubrication. The machine should be kept free from debris and contaminants that can affect its performance. Cleaning the hopper, barrels, and molds regularly will prevent material buildup and blockages.

Proper lubrication is also essential to prevent friction and wear on moving parts. Use recommended lubricants and follow the manufacturer’s guidelines for lubricating critical components such as screws and molds. Regularly inspect the lubrication system and ensure that the lubricant levels are adequate.

B. Inspection and Replacement of Wear Parts

As mentioned earlier, wear and tear on moving parts can significantly impact the performance of plastic injection molding machines. Regular inspection of critical components such as screws, barrels, and molds is imperative to identify signs of wear or damage.

If any parts show signs of excessive wear or damage, it is crucial to replace them promptly. Delaying the replacement can lead to further damage to the machine and compromised product quality. Always use genuine parts from the machine manufacturer or trusted suppliers to ensure compatibility and performance.

C. Calibration and Adjustment Procedures

Accurate calibration and adjustment of plastic injection molding machines are essential for maintaining consistent product quality. Regularly calibrating temperature, pressure, speed, and other relevant settings will help ensure precise and repeatable production processes.

Different materials and product requirements may necessitate adjustments in machine settings. It is important to understand the specific requirements of each production run and make the necessary adjustments accordingly. Refer to the machine’s operating manual or consult with experts for guidance on calibration and adjustment procedures.

V. Preventive Maintenance Schedule

To ensure proactive maintenance and avoid unexpected breakdowns, it is recommended to follow a preventive maintenance schedule tailored to the specific machine model or manufacturer’s recommendations. This schedule should include regular tasks such as cleaning, lubrication, inspection, and calibration. Daoben is a professional plastic injection molding machine manufacturer.

By adhering to a preventive maintenance schedule, you can reap several benefits. Firstly, it helps identify potential issues before they escalate into major problems, minimizing the risk of unplanned downtime. Secondly, it extends the lifespan of the machine, reducing the need for premature replacements and saving costs in the long run. Lastly, it ensures consistent product quality and customer satisfaction.


Regular maintenance is crucial for keeping your plastic injection molding machine running smoothly and efficiently. By following the tips provided in this blog post, you can extend the lifespan of your machine, reduce costly downtime, and ensure consistent product quality. Remember, neglecting maintenance can lead to expensive repairs, decreased productivity, and dissatisfied customers. Prioritize regular maintenance and make it an integral part of your manufacturing processes. Happy molding!

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Frequently Asked Questions

Daoben has the SOP (Standard Operation Procedure) and all the production steps must follow up this SOP. Every machine needs at least automatic running over 72 hours and must be inspected carefully before shipment.

Actually, the delivery time of the machines is depended on the machine options. Normally, the delivery time of a standard machine could be within 1-2 months.

12 months warranty after shipment for mechanical parts, hydraulic parts, and electric components excluding the screw and barrel 6 months (not including use for recycled material or reclaimed material).

Yes, Daoben will provide one set of standard spare parts to the customer including a heater, filter, screw head, screw washer, checking ring, sealings, etc.

Surely, we have experienced technical engineers for oversea service, they would help you install machines and support training to workers also. Currently, we provide visits online by video call for COVID-19.

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