Hey there! I’m a supplier of Slide Table Vertical Injection Moulding Machines, and today I wanna talk about how to set the injection speed of these machines. It’s a crucial aspect that can significantly impact the quality of the final product, so let’s dive right in. Slide Table Vertical Injection Moulding Machine
Understanding the Basics of Injection Speed
First off, let’s get a clear idea of what injection speed means. Injection speed refers to how fast the molten plastic is pushed into the mold cavity. It’s measured in millimeters per second (mm/s) or inches per second (in/s). A proper injection speed ensures that the plastic fills the mold evenly, without air bubbles or other defects.
The injection speed can vary depending on several factors, such as the type of plastic material, the size and complexity of the mold, and the desired properties of the final product. For example, if you’re using a high – viscosity plastic, you might need a higher injection speed to ensure it fills the mold completely.
Factors Affecting Injection Speed
Plastic Material
Different plastics have different flow characteristics. Some plastics, like polyethylene, have a low viscosity and can flow easily. These types of plastics usually require a lower injection speed. On the other hand, engineering plastics like polycarbonate or PEEK have a higher viscosity, and they need a higher injection speed to fill the mold properly.
For instance, when I was working with a client who was using polypropylene for a simple plastic container, we set the injection speed at around 60 mm/s. But when another client was making a complex electronic part with ABS plastic, we had to increase the injection speed to about 100 mm/s.
Mold Design
The size and complexity of the mold play a big role in determining the injection speed. A large – sized mold with thin walls will need a higher injection speed to ensure that the plastic reaches all the corners of the mold before it starts to solidify.
If the mold has intricate details or small channels, a faster injection speed might be necessary to fill these areas. For example, a mold for a tiny plastic gear with lots of teeth will require a relatively high injection speed compared to a simple flat plate mold.
Product Requirements
The properties of the final product also influence the injection speed. If you want a product with high strength and good surface finish, you need to find the right balance in injection speed. A too – slow injection speed might lead to a poor surface finish and weak parts, while a too – fast injection speed can cause flash (excess plastic) and other defects.
How to Set the Injection Speed
Step 1: Know Your Plastic
Before you start setting the injection speed, you need to know the properties of the plastic you’re using. Check the material data sheet provided by the plastic manufacturer. It will give you information about the recommended injection speed range for that particular plastic.
For example, if you’re using nylon, the data sheet might suggest an injection speed between 80 – 120 mm/s. This gives you a starting point for your settings.
Step 2: Consider the Mold
Take a good look at the mold design. Measure the size of the mold cavity, the thickness of the walls, and the presence of any complex features. If the mold has a large volume and thin walls, you’ll likely need a higher injection speed.
You can also use simulation software to predict how the plastic will flow in the mold at different injection speeds. This can help you make more informed decisions.
Step 3: Start with a Test Run
Once you have an idea of the appropriate injection speed range, start with a test run. Set the injection speed at the lower end of the recommended range and see how the plastic fills the mold. Check for any signs of incomplete filling, air bubbles, or flash.
If the plastic doesn’t fill the mold completely, gradually increase the injection speed in small increments (e.g., 5 – 10 mm/s) and run another test. Keep doing this until you achieve a good fill without any major defects.
Step 4: Monitor and Adjust
During the production process, keep an eye on the quality of the products. If you notice any changes in the surface finish, part strength, or other properties, it might be a sign that the injection speed needs to be adjusted.
For example, if you start to see flash on the parts, it could mean that the injection speed is too high. In this case, reduce the speed slightly and see if the problem goes away.
Common Mistakes to Avoid
Setting the Speed Too High
One of the most common mistakes is setting the injection speed too high. This can cause flash, which is excess plastic that leaks out of the mold. Flash not only affects the appearance of the product but also increases the amount of waste.
It can also put extra stress on the mold and the machine, leading to premature wear and tear. So, always start with a conservative injection speed and increase it gradually if needed.
Setting the Speed Too Low
On the other hand, setting the injection speed too low can result in incomplete filling of the mold. This can lead to parts with voids or weak spots, which are not acceptable for most applications.
If you’re getting incomplete fills, don’t just keep increasing the pressure. Instead, focus on increasing the injection speed in a controlled manner.
Conclusion
Setting the injection speed of a Slide Table Vertical Injection Moulding Machine is a process that requires careful consideration of several factors. By understanding the properties of the plastic, the design of the mold, and the requirements of the final product, you can find the optimal injection speed.
Remember, it’s always a good idea to start with a test run and make adjustments based on the results. And if you ever run into any problems or need more advice, don’t hesitate to reach out.
Tiebarless Injection Moulding Machine If you’re in the market for a Slide Table Vertical Injection Moulding Machine or need help with injection speed settings, I’d love to have a chat with you. We can discuss your specific needs and find the best solutions for your production. Contact me to start the conversation and let’s make your injection molding process more efficient and successful!
References
- Injection Molding Handbook, Second Edition by Dominick V. Rosato, David V. Rosato, and Michael G. Rosato
- Plastics Engineering Handbook of the Society of Plastics Engineers by Michael L. Berins
Guangdong Baizan Intelligent Equipment Co., Ltd.
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